KR20230165716A - Boom energy and swing energy recovery system for construction machinery with mobile linked - Google Patents

Abstract

The present invention relates to a boom energy and swing energy recovery system for mobile-linked construction equipment, and to a boom energy and swing energy recovery system for mobile-linked construction equipment that can be controlled in conjunction with a mobile device.
According to the present invention, including a boom energy recovery unit and a swing energy recovery unit, energy wasted when the boom is down and energy wasted when the main body is rotated can be recovered, utilized, and operated in various operation modes, Additionally, it has the advantage of being able to be easily installed or removed from existing construction machinery.

Description

Boom energy and swing energy recovery system for mobile linked construction machinery {BOOM ENERGY AND SWING ENERGY RECOVERY SYSTEM FOR CONSTRUCTION MACHINERY WITH MOBILE LINKED}

The present invention relates to a boom energy and swing energy recovery system for mobile-linked construction equipment. More specifically, it is capable of being controlled in conjunction with a mobile device, and is capable of recovering boom energy generated when the boom is lowered and when the main body of the construction machine turns. This relates to a boom energy and swing energy recovery system for mobile linked construction equipment that can recover swing energy.

Excavators and excavators are construction machines generally used for digging or cutting the ground, and are widely used at construction sites and various industrial sites. This excavator includes a boom whose end can be moved along a curved trajectory, and various tools including a bucket can be mounted on the end of the boom.

A hydraulic cylinder is connected to the boom, and the hydraulic cylinder drives the boom while lifting and lowering. Hydraulic cylinders are raised and lowered through oil flow in the hydraulic system. An excavator includes power means such as an engine. The engine provides the fluidity of oil flow in the hydraulic system and can simultaneously provide power for the movement of the excavator.

In general, because the weight of an excavator is very large, fuel consumption due to movement is very large. Additionally, because the boom's own weight is also heavy, a lot of fuel is consumed to drive the boom.

As eco-friendly issues have recently emerged, various technological developments and research are being conducted to improve fuel efficiency in the field of construction equipment such as excavators. For example, when the boom of an excavator goes down, a technology has been proposed to recover boom energy (potential energy) and temporarily store it to assist in moving the excavator or driving the boom.

However, this conventional technology had the problem of lowering work efficiency by imposing significant restrictions on the work operation of the boom or work speed, and also had the problem of being very difficult to install on various existing excavator cranes.

Meanwhile, the main body on which the cabinet and engine for workers to ride are installed on the upper part of various construction machines, including excavators and excavators, performs work while rotating and moving in the horizontal direction.

In addition to the boom energy generated when the boom is lowered, turning energy is also generated when the main body turns and moves in the horizontal direction, but no technology or method for recovering and storing boom energy and turning energy and reusing it has been proposed to date. .

Therefore, there is a need for a method of recovering and storing the enormous amount of boom energy and swing energy that is typically lost in construction machinery and then utilizing it.

Meanwhile, various construction machines display and provide information through a display unit within the construction machine, which allows workers to work while recognizing the current status of the construction machine.

Recently, various methods have been proposed to link construction machinery and mobile devices, but there is a problem in that the status of construction equipment is simply provided to the mobile device and the operator is only able to recognize it, which reduces interoperability and thus reduces versatility. There is a problem.

Republic of Korea Patent No. 10-2309862

Based on the technical background as described above, the present invention enables control in construction equipment in conjunction with a mobile device, recovers boom energy wasted when the boom is down, and swing energy is discarded when the main body rotates. The purpose is to provide a boom energy and swing energy recovery system for mobile linked construction machinery that can be recovered and utilized, can be operated in various operation modes, and can be easily installed or removed from existing construction machinery.

The boom energy and swing energy recovery system for mobile interlocked construction equipment according to an embodiment of the present invention is a boom cylinder in which a rod is lifted and lowered by the flow of oil and includes a large chamber and a small chamber formed on the upper part of the large chamber. An engine that provides oil flow to the boom cylinder and is connected to the main pump by a shaft, a boom that drives the boom up/boom down by the boom cylinder by the oil flow, and a swing motor installed on the upper part of the construction machine drive unit. In the energy recovery system for construction equipment that is installed on a construction machine and recovers energy, including a main body that pivots and moves in the horizontal direction by the drive, the energy recovery system is connected to the boom cylinder and selectively controls the flow of oil provided to the boom cylinder. main control valve; A hydraulic motor assembly that is connected to the engine and generates rotational force by oil flowing in, and includes a hydraulic motor that is connected to the shaft of the engine through a rotation axis to provide rotational force, and at least one pipe for inflowing and discharging oil; A boom energy recovery unit that recovers oil discarded when the boom cylinder is brought down; A turning energy recovery unit that recovers oil discarded during the turning movement of the main body; mobile users have; and a control unit linked to the mobile and controlling the operation of the construction machine based on the operation signal. It includes, and is characterized in that the boom energy generated through the oil recovered by the boom energy recovery unit and the swing energy generated through the oil recovered by the swing energy recovery unit are reused.

As one embodiment, the main control valve is connected to a spool that operates so that the flow of oil is directed to the large chamber or small chamber of the cylinder, a main valve line that flows oil to the main control valve, and the spool, and a boom-up valve. It is connected to the boom-up valve line, which allows oil to flow into the large chamber and boom-up due to the movement of the spool when the boom-up valve is opened, and is connected to the spool, and a boom-down valve is arranged to move the spool according to the opening of the boom-down valve. It may include a boom-down valve line that causes oil to flow into the small chamber due to movement and boom-downs the boom.

In another embodiment, the boom energy recovery unit is connected to the boom cylinder, accumulating oil flowing in from the boom cylinder, and discharging the accumulated oil to the boom cylinder and engine, a plurality of lines through which oil flows, and A boom energy valve assembly that is installed in at least one selected line among a plurality of lines and includes a valve that controls the flow rate of oil, and an oil tank provided with at least one to allow oil to flow in and be stored, or to allow the stored oil to flow out. It can be included.

As one embodiment, the boom energy valve assembly includes a first line on one side connected to the large chamber of the boom cylinder, a second line connecting the first line and the accumulator, and a second line connecting the first line and the accumulator. A third line, a fourth line connecting the accumulator and the hydraulic motor assembly, a fifth line connected on one side to the small chamber of the boom cylinder, and a sixth line branched from the first line and connected to the fifth line. and a seventh line branching from the first line, an eighth line connected on one side to the fifth line and the sixth line, and an oil flow rate disposed in the second line so that the oil flows only toward the accumulator. A first AC valve that controls, a CA valve disposed in the third line to control the oil flow rate so that the oil flows only toward the first line, and a first CM disposed in the fourth line to control the oil flow rate. A valve, an AB valve arranged in the 6th line to control the oil flow rate, an AR valve arranged in the 7th line to control the oil flow rate, and arranged in the flow path between the accumulator and the oil tank and operated in an on-off manner. It may include a first release valve, and a first solenoid valve disposed in parallel with the first release valve between the accumulator and the oil tank.

In one embodiment, the control unit controls the operation of the boom energy recovery unit based on the operation signal to recover oil according to the boom down to the accumulator and then stores the boom energy recovery mode. , boom energy fuel saving mode (Boom Energy Eco Mode), which assists the engine output with oil accumulated in the accumulator, and boom energy performance improvement mode (boom energy performance improvement mode), which assists the power required for boom-up operation using oil accumulated in the accumulator. Boom Energy Power Mode), Boom Energy Pressure Release Mode, which relieves the pressure inside the accumulator by discharging the oil accumulated in the accumulator to the outside, and temporarily suspends the accumulator pressure when the boom touches the ground. It can operate in any one mode selected among the Boom Energy Recovery Off Mode.

As a specific embodiment, the boom energy recovery mode (Boom Energy Recovery Mode), when the boom goes down, closes the boom down valve and then flows oil into the small chamber of the boom cylinder to lower the rod of the boom cylinder, and lowers the rod of the boom cylinder. The oil inside the chamber is discharged through the first line, the oil flowing in the first line is recovered to the accumulator through the second line, and the oil recovered into the accumulator can be accumulated and stored for use.

As another specific embodiment, the boom energy recovery mode opens the AB valve, allowing a portion of the oil flowing in the first line to flow into the small chamber of the boom cylinder through the sixth line and the fifth line. You can increase the boom down speed by doing this.

As another specific embodiment, the boom energy recovery mode may open the AR valve to allow a portion of the oil flowing in the first line to flow into the oil tank through the seventh line.

As a specific embodiment, the boom energy fuel saving mode (Boom Energy Eco Mode) opens the first CM valve arranged in the fourth line and closes the CA valve arranged in the third line when the boom booms, The oil accumulated in the accumulator flows into the hydraulic motor of the hydraulic motor assembly through the fourth line, the rotation shaft of the hydraulic motor rotates due to the inflow oil, and the rotational force of the rotation shaft of the hydraulic motor is provided to the shaft of the engine to operate the engine. Can assist shaft output.

As a specific embodiment, the boom energy performance improvement mode (Boom Energy Power Mode) opens the CA valve disposed in the third line and closes the first CM valve disposed in the fourth line when the boom booms, The oil accumulated in the accumulator flows into the large chamber of the boom cylinder through the third line and the first line, and in addition to the oil flowing into the large chamber by the engine, oil flows from the accumulator to the large chamber and flows into the large chamber. The spring boom-up speed can be increased by increasing the amount of incoming oil.

As a specific embodiment, the Boom Energy Pressure Release Mode opens the first release valve, closes the CA valve and the first CM valve, and releases the oil accumulated in the accumulator through the first release valve. The pressure inside the accumulator can be reduced by discharging part of it into the oil tank.

As another specific embodiment, the Boom Energy Pressure Release Mode opens the first solenoid valve, closes the CA valve and the first CM valve, and releases accumulated pressure to the accumulator through the first solenoid valve. The pressure inside the accumulator can be reduced by discharging all of the oil into the oil tank.

As a specific embodiment, the boom energy recovery off mode may temporarily stop the accumulation of oil in the accumulator by closing the first AC valve when the boom touches the ground.

As another specific embodiment, the boom energy recovery off mode (Boom Energy Recovery Off Mode) closes the first AC valve and AR valve and opens the AB valve when the boom touches the ground, so that oil discharged from the large chamber can only flow into the small chamber.

In one embodiment, the swing energy recovery unit is connected to a swing motor connected to the main pump of the engine, and includes a high pressure accumulator that accumulates oil flowing in according to the rotation of the swing motor and discharges the accumulated oil to the hydraulic motor assembly. , a low-pressure accumulator that is connected to the swing motor connected to the main pump of the engine and provides oil to the swing motor to prevent cavity in the swing motor, and a plurality of lines to allow oil to flow and at least one line selected from the plurality of lines. It may include a swing energy valve assembly that is installed and includes a valve that controls the flow rate of oil, and at least one oil tank that allows oil to flow in and be stored, or to allow the stored oil to flow out.

As a specific embodiment, the swing energy valve assembly includes an 11th line connected on one side to the main pump, a 12th line connected to the other side of the 11th line, and a 12th line connected to the left side of the swing motor, and a 12th line connected to the other side of the 11th line. connected, the 13th line connected to the right side of the swing motor, the 14th line branching from the 12th line, the 15th line branching from the 13th line, and the 14th and 15th lines are merged, but the high pressure axis It includes a 16th line connected to the compressor, a 17th line connecting the high pressure accumulator and a hydraulic motor, and an 18th line branched from the 17th line and connected to the oil tank, and the 11th line, the 12th and the 12th line. A direction change valve disposed at the connection portion of the 13th line and controlling the flow direction of the oil, a second AC valve disposed at the 16th line and controlling the flow rate of the oil so that the oil flows only toward the high pressure accumulator, and A second CM valve disposed in line 17 to control the flow rate of oil, first and second check valves disposed in the 14th and 15th lines to control the flow rate of oil, and a high temperature accumulator in the 18th line It may include a second release valve disposed between the oil tanks and operating in an on-off manner, and a second solenoid valve disposed in parallel with the second release valve between the high pressure accumulator of the 18th line and the oil tank.

In one embodiment, the control unit controls the operation of the swing energy recovery unit based on the operation signal to recover oil according to the swing of the main body to the high pressure accumulator and then store it. , Swing Energy Eco Mode, which assists engine output with oil accumulated in the high-pressure accumulator, and Swing Energy Eco Mode, which relieves the pressure inside the high-pressure accumulator by discharging the oil accumulated in the high-pressure accumulator to the outside. It can operate in any one of the energy pressure release modes (Swing Energy Pressure Release Mode).

As a specific embodiment, the swing energy recovery mode flows oil from the main pump into the 11th line when the main body rotates, and controls the direction change valve to change the flow direction of the oil to the 12th line or Oil is introduced by switching to the 13th line, and the swing motor is rotated to the right or left by the oil flowing into the 12th line or the 13th line, and then the 14th line or the 14th line is rotated through the 13th line or the 12th line. The oil flowing into the 15th line or the 15th line is recovered to the high pressure accumulator through the 16th line, and the oil recovered into the high pressure accumulator can be stored and used.

As a specific embodiment, the swing energy fuel saving mode (Swing Energy Eco Mode) opens the second CM valve disposed in the 17th line when the main body rotates, and releases the oil accumulated in the high pressure accumulator through the 17th line. It flows into the hydraulic motor of the hydraulic motor assembly through the oil, and the rotating shaft of the hydraulic motor rotates due to the introduced oil, and the rotating force of the rotating shaft is provided to the shaft of the engine to assist the shaft output of the engine.

As another specific embodiment, the swing energy pressure release mode opens the second release valve and discharges a portion of the oil accumulated in the high pressure accumulator to the oil tank through the second release valve to provide high pressure. The pressure inside the accumulator can be reduced.

As another specific embodiment, the swing energy pressure release mode opens the second solenoid valve and discharges all of the oil accumulated in the high pressure accumulator into the oil tank through the second solenoid valve. The pressure inside the high pressure accumulator can be reduced.

As one embodiment, the swing energy valve assembly further includes a 21st line connecting the 12th line and the 13th line, and a 22nd line branched from the 21st line and connected to the oil tank, and the 21st line A first relief valve and a second relief valve disposed in the line at regular intervals from each other and opened by oil pressure to control the oil flow rate, and a fifth check valve disposed in the 22nd line to control the oil flow rate may include.

In a specific embodiment, when the pressure of the oil flowing into the 12th line or the 13th line through the 11th line when accelerating the turning movement of the main body exceeds the preset oil pressure range, the control unit operates the first relief valve. Or, the second relief valve is opened, and part of the oil flowing into the swing motor through the 12th line or the 13th line is transferred to the 22nd line through the 21st line and the first relief valve or the 21st line and the 2nd relief valve. flows in, and by opening the fifth check valve, part of the oil flowing into the 22nd line can be allowed to flow into the oil tank.

As another embodiment, the swing energy valve assembly further includes a 23rd line connecting the 12th line and the 13th line, and a 24th line branched from the 23rd line and connected to the low pressure accumulator, It may be disposed at regular intervals in the line and include a third check valve and a fourth check valve that control the flow rate of oil.

As a specific embodiment, when decelerating the turning movement of the main body, the control unit replaces the oil that flows into the swing motor through the 12th line or the 13th line to rotate the swing motor and then flows into the accumulator, and performs the third check. After opening the valve or the fourth check valve, the oil from the low pressure accumulator flows into the 23rd line through the 24th line and the 3rd check valve or the 4th check valve, and the oil flowing into the 23rd line flows into the 12th line or It is possible to prevent cavity in the swing motor by flowing it into the swing motor through the 13th line.

As described above, according to the present invention, the boom energy and swing energy recovery system for mobile-linked construction equipment can be controlled in conjunction with the mobile, recovers boom energy that is wasted when the boom is down, and generates energy when the main body accelerates. In addition to assisting the operation of the engine with the rotating energy, the rotating energy of the main body is recovered while preventing cavitation that may occur when the main body decelerates, and this can be utilized, operated in various operation modes, and used in existing construction. The effect is that it can be easily installed or removed from the machine.

1 is a conceptual diagram showing the overall appearance of a construction machine according to an embodiment of the present invention.
Figure 2 is a schematic diagram showing a boom energy and swing energy recovery system for mobile interlocking construction equipment according to an embodiment of the present invention.
Figure 3 is a perspective view showing a hydraulic motor assembly according to an embodiment of the present invention.
Figure 4 is a plan view showing a boom energy recovery unit according to an embodiment of the present invention.
Figure 5 is a perspective view showing a boom energy recovery unit according to an embodiment of the present invention.
Figure 6 is a plan view showing a cutaway bracket of the boom energy recovery unit according to an embodiment of the present invention.
Figure 7 is a schematic diagram showing a boom energy recovery mode (Boom Energy Recovery Mode) for recovering boom energy in a boom energy and swing energy recovery system for mobile interlocking construction equipment according to an embodiment of the present invention.
Figure 8 is a schematic diagram showing a boom energy fuel saving mode (Boom Energy Eco Mode) that assists the output of the engine with boom energy recovered from the boom energy and swing energy recovery system for mobile linked construction equipment according to an embodiment of the present invention. .
Figure 9 shows a boom energy performance improvement mode (Boom Energy) that assists the power required for the boom-up operation of the boom with boom energy recovered from the boom energy and swing energy recovery system for mobile interlocking construction equipment according to an embodiment of the present invention. This is a schematic diagram showing Power Mode.
Figure 10 is a schematic diagram showing a boom energy pressure release mode that relieves the internal pressure of the accumulator in the boom energy and swing energy recovery system for mobile interlocked construction equipment according to an embodiment of the present invention.
Figure 11 is a schematic diagram showing a swing energy recovery mode that recovers swing energy when the main body swings to the right in the boom energy and swing energy recovery system for mobile linked construction equipment according to an embodiment of the present invention. .
Figure 12 is a schematic diagram showing a swing energy recovery mode (Swing Energy Recovery Mode) that recovers swing energy when the main body swings to the left in the boom energy and swing energy recovery system for mobile linked construction equipment according to an embodiment of the present invention. .
Figure 13 is a schematic diagram showing a swing energy fuel saving mode (Swing Energy Eco Mode) that assists the output of the engine with swing energy recovered from the boom energy and swing energy recovery system for mobile linked construction equipment according to an embodiment of the present invention. .
Figure 14 is a schematic diagram showing a swing energy pressure release mode (Swing Energy Pressure Release Mode) that relieves the internal pressure of the high pressure accumulator in the boom energy and swing energy recovery system for mobile interlocked construction equipment according to an embodiment of the present invention.
Figure 15 is a schematic diagram showing the oil flow path during acceleration of the main body in the boom energy and swing energy recovery system for mobile linked construction equipment according to an embodiment of the present invention.
Figure 16 is a schematic diagram showing the oil flow path when the main body is decelerated in the boom energy and swing energy recovery system for mobile interlocked construction equipment according to an embodiment of the present invention.

Since the present invention can be modified in various ways and can have various embodiments, specific embodiments will be exemplified and explained in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all transformations, equivalents, and substitutes included in the spirit and technical scope of the present invention.

The terms used in the present invention are only used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present invention, terms such as 'include' or 'have' are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. At this time, note that in the attached drawings, identical components are indicated by identical symbols whenever possible.

Additionally, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some components are exaggerated, omitted, or schematically shown in the accompanying drawings.

Hereinafter, with reference to the attached drawings, the boom energy and swing energy recovery system for mobile linked construction machinery according to the present invention and the construction machinery including the same will be described in detail.

1 is a conceptual diagram showing the overall appearance of a construction machine according to an embodiment of the present invention. Figure 2 is a schematic diagram showing a boom energy and swing energy recovery system for mobile interlocking construction equipment according to an embodiment of the present invention. Figure 3 is a perspective view showing a hydraulic motor assembly according to an embodiment of the present invention. Figure 4 is a plan view showing a boom energy recovery unit according to an embodiment of the present invention. Figure 5 is a perspective view showing a boom energy recovery unit according to an embodiment of the present invention. Figure 6 is a plan view showing a cutaway bracket of the boom energy recovery unit according to an embodiment of the present invention. Figure 7 is a schematic diagram showing a boom energy recovery mode (Boom Energy Recovery Mode) for recovering boom energy in a boom energy and swing energy recovery system for mobile interlocking construction equipment according to an embodiment of the present invention. Figure 8 is a schematic diagram showing a boom energy fuel saving mode (Boom Energy Eco Mode) that assists the output of the engine with boom energy recovered from the boom energy and swing energy recovery system for mobile linked construction equipment according to an embodiment of the present invention. . Figure 9 shows a boom energy performance improvement mode (Boom Energy) that assists the power required for the boom-up operation of the boom with boom energy recovered from the boom energy and swing energy recovery system for mobile interlocking construction equipment according to an embodiment of the present invention. This is a schematic diagram showing Power Mode. Figure 10 is a schematic diagram showing a boom energy pressure release mode that relieves the internal pressure of the accumulator in the boom energy and swing energy recovery system for mobile interlocked construction equipment according to an embodiment of the present invention. Figure 11 is a schematic diagram showing a swing energy recovery mode that recovers swing energy when the main body swings to the right in the boom energy and swing energy recovery system for mobile linked construction equipment according to an embodiment of the present invention. . Figure 12 is a schematic diagram showing a swing energy recovery mode (Swing Energy Recovery Mode) that recovers swing energy when the main body swings to the left in the boom energy and swing energy recovery system for mobile linked construction equipment according to an embodiment of the present invention. . Figure 13 is a schematic diagram showing a swing energy fuel saving mode (Swing Energy Eco Mode) that assists the output of the engine with swing energy recovered from the boom energy and swing energy recovery system for mobile linked construction equipment according to an embodiment of the present invention. . Figure 14 is a schematic diagram showing the swing energy pressure release mode (Swing Energy Pressure Release Mode) that relieves the internal pressure of the high pressure accumulator in the boom energy and swing energy recovery system for mobile interlocked construction equipment according to an embodiment of the present invention. Figure 15 is a schematic diagram showing the oil flow path during acceleration of the main body in the boom energy and swing energy recovery system for mobile linked construction equipment according to an embodiment of the present invention. Figure 16 is a schematic diagram showing the oil flow path when the main body is decelerated in the boom energy and swing energy recovery system for mobile interlocked construction equipment according to an embodiment of the present invention.

With reference to FIGS. 1 to 6, a boom energy and swing energy recovery system for mobile interlocked construction equipment according to an embodiment of the present invention will be described in detail.

The boom energy and swing energy recovery system for mobile interlocked construction machinery according to an embodiment of the present invention is a structure that can be installed and released on construction machinery 100, and includes a main control valve 160, a hydraulic motor assembly 300, and It may be configured to include a boom energy recovery unit 200, a swing energy recovery unit 500, a mobile 400, and a control unit 170, and includes a boom cylinder 140, an engine 120, and a boom of the construction equipment 100. It can be installed by connecting to (130) and the main body (110).

Specifically, a boom 130 and a boom cylinder 140 may be connected to the main body 110. The boom cylinder 140 can move up and down by the flow of oil, and the boom 130 can rotate by the up and down operation of the boom cylinder 140.

An engine 120 may be disposed inside the main body 110. The engine 120 may provide a flow of oil to the boom cylinder 140. The engine 120 may provide driving force to a driving unit (not shown) disposed on the lower side of the main body 110.

The operation of the boom cylinder 140 will be examined in more detail as follows. The construction machine 100 may have a cabinet 150 in the main body 110 on which a worker can ride. A joystick 151 that can control the boom-up or boom-down operation of the boom 130 may be placed in the cabinet 150.

Specifically, the boom cylinder 140 moves up and down by the flow of oil and may include a rod 141 connected to the boom 130. The boom cylinder 140 may include a large chamber 142 and a small chamber 143 formed on the large chamber 142.

The rod 141 is disposed between the small chamber 143 and the large chamber 142 of the boom cylinder 140, and rises when oil flows into the large chamber 142, and when oil flows into the small chamber 143, the rod 141 rises. You can descend. When the rod 141 rises, the boom 130 can boom up, and when the rod 141 falls, the boom 130 can boom down.

The main control valve 160 is connected to the boom cylinder 140 and can selectively control the flow of oil provided to the boom cylinder 140. The main control valve 160 may be placed on the construction machine 100.

Here, the main control valve 160 may be connected to the large chamber 142 through the large chamber line 144, and the main control valve 160 may be connected to the small chamber 143 through the small chamber line 145.

Additionally, a spool 161 may be disposed on the main control valve 160.

The flow of oil may be directed toward the small chamber 143 or toward the large chamber 142 by the spool 161. That is, the rod 141 of the boom cylinder 140 can rise or fall by the operation of the spool 161 disposed on the main control valve 160.

The engine 120 is provided with a shaft 121, and a main pump 122 may be connected to the shaft 121. The main pump 122 and the spool 161 are connected to the main valve line 162, and oil can flow to the spool 161 and the main control valve 160 through the main valve line 162.

The spool 161 can be controlled by the boom up valve 163 and the boom down valve 164. An auxiliary pump 123 may be connected to the shaft 121 of the engine 120. The auxiliary pump 123 and the spool 161 are connected to the boom-up valve line 165, and the boom-up valve 163 may be disposed on the boom-up valve line 165. The auxiliary pump 123 and the spool 161 are connected to the boom down valve line 166, and the boom down valve 164 may be disposed on the boom down valve line 166. When the boom-up valve 163 opens, the spool 161 moves, allowing oil to flow into the large chamber 142, and when the boom-down valve 164 opens, the spool 161 moves, allowing oil to flow into the small chamber 143. ) can flow.

The hydraulic motor assembly 300 is connected to the engine 120 that provides the flow of oil, and can provide rotational force generated by the fluid to the engine.

The hydraulic motor assembly 300 includes a hydraulic motor 310. The hydraulic motor 310 is a device that generates rotational force using fluid. When oil flows into the hydraulic motor 310, rotational force can be generated. The rotation axis of the hydraulic motor 310 may be connected to the shaft 121 of the engine 120. Accordingly, the hydraulic motor 310 can provide rotational force to the shaft 121. The hydraulic motor assembly 300 may be provided with a pipe through which oil can flow into or be discharged from the hydraulic motor 310, and may be provided with a pipe connected to the first oil tank T1, which will be described later.

The hydraulic motor 310 of the hydraulic motor assembly 300 may be installed in the engine room where the engine 120 is placed in the construction machine 100. For this purpose, the hydraulic motor 310 may be provided with a fastening part (not shown) that can be fastened to the engine room. In addition, pipes through which oil can be introduced or discharged, pipes connected to the first oil tank T1, etc. may be provided to be connected to corresponding pipes in existing construction machinery.

The boom energy recovery unit 200 is for recovering oil discarded when the boom of the boom cylinder 140 is down. It is connected to the boom cylinder 140 and discharges the accumulated pressure to the boom cylinder 140, and the boom cylinder ( 140) oil may flow in and accumulate pressure. The boom energy recovery unit 200 may be a pressure accumulation assembly capable of accumulating oil in the boom cylinder 140.

Specifically, the boom energy recovery unit 200 may include a bracket 210, an accumulator 220, a boom energy valve assembly 230, a main pipe 240, and an oil tank (T).

The bracket 210 is detachably fastened to the main body 110 of the construction machine 100, and the accumulator 220, the boom energy valve assembly 230, and the main pipe 240 are disposed on the bracket 210. The bracket 210 is a part installed on the construction machine 100, and is configured to include the accumulator 220, the boom energy valve assembly 230, and the main pipe 240.

The bracket 210 may be formed in a thin plate shape or a plate shape. The bracket 210 may be placed outside the construction machine 100. The bracket 210 may be provided with a fastening part (not shown) so that it can be fastened to the construction machine 100. The fastening part (not shown) may be provided, for example, with a screw hole into which a bolt can be inserted.

The bracket 210 has a main pipe 240 and a boom energy valve assembly 230 disposed on the front side facing the boom 130, and a hollow portion 212 is formed on the rear side, between the front side and the rear side. The accumulator 220 may be placed in . A groove 213 may be formed on the front side of the bracket 210.

The groove portion 213 may be formed by being depressed from the front end of the bracket 210 to the rear side. The shape of the groove 213 is shaped to correspond to the shape of the outer surface of the cabinet 150 of the construction machine 100, thereby minimizing spatial interference between the cabinet 150 and the bracket 210. The main pipe 240 and the boom energy valve assembly 230 may be disposed on the front side of the bracket 210 in a portion where the groove portion 213 is not formed. That is, a groove 213 may be formed on one side of the front side of the bracket 210, and the main pipe 240 and the boom energy valve assembly 230 may be disposed on the other side.

Due to the structure of the bracket 210, the portion of the bracket 210 where the main pipe 240 and the boom energy valve assembly 230 are placed can be placed closer to the boom 130, and thus the boom cylinder The length of various pipes or lines connected to (140) can be minimized, thereby minimizing the flow resistance of the oil flow.

A hollow portion 212 may be formed on the rear side of the bracket 210. An engine 120 may be disposed on the rear side of the boom energy recovery unit 200. By using the hollow portion 212, the influence of heat generated from the engine 120 on the accumulator 220 can be reduced. Additionally, the hollow portion 212 may reduce the weight of the bracket 210. The hollow portion 212 may be formed not only on the rear side of the bracket 210, but also on the central or front side of the bracket 210.

Additionally, the accumulator 220 may be arranged to be spaced apart from the rear end (rear end) of the bracket 210. Through this, even when the boom energy recovery unit 200 is installed on the construction machine 100, it is convenient to open the engine room for maintenance of the engine 120, and it is also easy for workers to separate and install the accumulator 220. You can. In addition, it is possible to prevent heat and vibration generated from the engine 120 from being directly transmitted to the accumulator 220.

A mount 211 may be disposed between the front and rear sides of the bracket 210. The mount 211 is configured to mount the accumulator 220. The accumulator 220 can be arranged at a predetermined distance from the upper surface of the bracket 210 by the mount 211. Accordingly, the accumulator 220 can be easily separated and installed, and heat and vibration generated in the engine 120 can be prevented from being directly transmitted to the accumulator 220.

The bracket 210 may be detachably installed on the construction machine 100. The bracket 210 can be installed by modifying the exterior or interior of the existing construction machine 100. The specific size or detailed shape of the bracket 210 may be partially modified depending on the construction machine 100 to be installed. Due to this configuration of the bracket 210, the energy recovery device according to the present invention can be easily and conveniently installed on various existing construction machines 100.

Oil may be accumulated in the accumulator 220, and when necessary, oil previously accumulated in the accumulator 220 may be discharged from the accumulator 220. The main pipe 240 is connected to the boom cylinder 140. The boom energy valve assembly 230 is connected to the main pipe 240.

The boom energy valve assembly 230 can be controlled to open and close respectively by the pilot pipe 250. Specifically, the boom energy valve assembly 230 includes a first line (L1), a second line (L2), a third line (L3), a first AC valve (AC1), and a CA valve (CA). The first line (L1) is a line connected to the large chamber 142 of the boom cylinder 140. The first line L1 may be connected to the large chamber line 144. The second line (L2) and the third line (L3) are lines connecting the first line (L1) and the accumulator 220.

A first AC valve (AC1) is disposed in the second line (L2). The first AC valve (AC1) is a valve provided to control the oil flow, and controls the flow of oil only from the second line (L2) toward the accumulator 220 to charge oil to the accumulator 220. It may be a charging valve that does.

A CA valve (CA) is disposed in the third line (L3). The CA valve (CA) is a valve provided to control the oil flow, and is a release valve that releases the oil in the accumulator 220 so that the oil flows only from the third line (L3) toward the first line (L1). It can be.

The boom energy valve assembly 230 may include a fourth line (L4) connecting the accumulator 220 and the hydraulic motor 310. The boom energy valve assembly 230 may include a first CM valve (CM1) that is provided to control the flow rate of oil in the fourth line (L4). Accordingly, the first CM valve (CM1) operates the hydraulic motor 310 so that the oil accumulated in the accumulator 220 flows into the hydraulic motor 310 through the fourth line (L4) and rotates the hydraulic motor 310. ) may be a motor release valve that releases oil.

The boom energy valve assembly 230 may include a fifth line (L5) and a sixth line (L6). The fifth line (L5) is a line connected to the small chamber 143 of the boom cylinder 140. The fifth line L5 may be connected to the small chamber line 145. The sixth line (L6) is a line that branches off from the first line (L1) and is connected to the fifth line (L5). An AB valve (AB) may be disposed in the sixth line (L6) to enable control of the flow rate of oil in the sixth line (L6). The AB valve (AB) is a regeneration valve that introduces a portion of the oil flowing in the first line (L1) into the small chamber 143 of the boom cylinder 140 through the sixth line (L6) and the fifth line (L5). It can be.

The boom energy valve assembly 230 may include a seventh line (L7). The seventh line (L7) is a line that branches off from the first line (L1) and is connected to the third oil tank (T3), which will be described later. An AR valve (AR) provided to control the flow rate of oil in the seventh line (L7) may be disposed in the seventh line (L7). The AR valve (AR) may be a return valve through which a portion of the oil flowing into the accumulator 220 flows into the accumulator 220 when the accumulator 220 is full of oil.

The boom energy valve assembly 230 may further include an eighth line (L8) connected to the fifth line (L5) and the sixth line (L6). The eighth line (L8) may be connected to the fourth oil tank (T4), which will be described later. Through the eighth line (L8), oil that has passed through the AB valve (AB) may flow into the fourth oil tank (T4). A check valve (not shown) may be placed in the eighth line L8.

The boom energy valve assembly 230 may include a first release valve (RE1). The first release valve RE1 is disposed on the flow path between the accumulator 220 and the second oil tank T2, which will be described later. The first release valve RE1 operates in an on-off manner.

The boom energy valve assembly 230 may further include a first solenoid valve (SOL1) connected in parallel to the first release valve (RE1). Specifically, the first solenoid valve (SOL1) is connected to each pipe before and after the first release valve (RE1), and may be arranged in parallel with the first release valve (RE1).

Accordingly, a first release valve (RE1) and a first solenoid valve (SOL1) may be dually installed between the accumulator 220 and the second oil tank (T2).

The first CM valve (CM1), CA valve (CA), first AC valve (AC1), AB valve (AB), AR valve (AR), and first release valve ( RE1), the first solenoid valve (SOL1), etc. can all be controlled by the control unit 170.

The main pipe 240 is a pipe connected to the boom cylinder 140. One main pipe 240 may be provided, and the first line L1 and the fifth line L5 may be formed simultaneously in the main pipe 240. Alternatively, two main pipes 240 may be provided, and a first line (L1) and a fifth line (L5) may be formed separately in each. A joint block 241 may be placed at the distal end of the main pipe 240. The large chamber 142 and the small chamber 143 of the boom cylinder 140 may be connected to the joint block 241.

The oil tank (T) may be formed of at least one oil tank (T) to allow oil to flow in and be stored therein, or to allow the stored oil to flow out.

The oil tank (T) is connected by piping to the first oil tank (T1), the first release valve (RE1), and the first solenoid valve (SOL1), which are connected to the hydraulic motor 310 of the hydraulic motor assembly 300 by piping. It may include a second oil tank (T2), a third oil tank (T3) connected to the seventh line, and a fourth oil tank (T4) connected to the eighth line.

The mobile 400 may be a terminal owned by a user or worker.

The mobile 400 may be communicatively connected to the control unit 170. Additionally, the mobile 400 may be controllably connected to the control unit 170, and the energy recovery system for construction machinery may be controlled by the mobile 400.

Specifically, the operation of the hydraulic motor assembly 300 and the boom energy recovery unit 200 can be controlled through the control unit 170 based on the operation signal of the mobile 400.

The mobile 400 may be provided with an input means for inputting a control command and an output means including a display means for displaying the operating status of the hydraulic motor assembly 300 and the boom energy recovery unit 200.

Here, the mobile 400 may be any one of a smartphone, PDA, laptop, or tablet.

In addition, the mobile 400 can communicate with the control unit 170 through serial communication and Ethernet communication, and can communicate with the control unit 170 using Wi-Fi, Bluetooth, and Zigbee. , communication can be made possible using beacons, RFID, etc., and the communication method of the mobile 400 is not limited to this.

To this end, a program or application for operating the energy recovery system for construction machinery may be installed in the mobile 400 through the control unit 170.

The control unit 170 may control the operation of the construction machine 100 based on the manipulation signal. For this purpose, the control unit 170 may be an electronic control unit (ECU).

Specifically, the control unit 170 can control the operation of the hydraulic motor assembly 300 and the boom energy recovery unit 200 to operate the boom energy recovery system based on the operation signal according to the control operation of the mobile 400. there is.

The control unit 170 can control whether to open or close the boom-up valve 163 or the boom-down valve 164 based on a manipulation signal according to the control operation of the mobile 400.

In addition, the control unit 170 can control the operation of the construction equipment 100 and whether the boom-up valve 163 or the boom-down valve 164 is opened or closed based on the operation signal of the joystick 151.

For this purpose, the joystick 151 may be equipped with a first sensor (S1) and a second sensor (S2). The first sensor (S1) detects the pressure change during the boom-up operation of the joystick 151 and generates a manipulation signal, and the second sensor (S2) detects the pressure change during the boom-down operation of the joystick 151 and operates it. A signal can be generated.

The operation signal generated by the first sensor (S1) and the second sensor (S2) is transmitted to the control unit 170, and the control unit 170 operates the boom-up valve 163 or the boom-down valve ( 164) can be controlled to open or close.

Here, the manipulation signal generated by the first sensor S1 and the second sensor S2 may be transmitted to the mobile 400 through the control unit 170. Through this, it is possible to control whether the boom-up valve 163 or the boom-down valve 164 is opened or closed using the mobile 400.

Meanwhile, the boom down valve 164 may also be placed in the large chamber line 144. That is, the boom down valve 164 can control not only the flow of the boom down valve line 166 but also the flow of the large chamber line 144. In this case, depending on the situation, during the boom-down operation of the joystick 151, the control unit 170 controls the boom-down valve 164 to close, allowing oil to flow from the large chamber 142 to the main control valve 160. It may also block the flow.

Due to the above-described structure, a specific mode can be selected through the control unit 170, and the control unit 170 controls the operation of the hydraulic motor assembly 300 and the boom energy recovery unit 200 to control the construction equipment 100. ) can be operated in various modes.

Here, setting, changing, and canceling various modes can be accomplished by controlling the control unit 170 through the mobile device 400. Additionally, it can be controlled by the control unit 170 through a manipulation signal from the joystick 151.

Specifically, the control unit 170 controls the operation of the construction equipment 100 by operating the mobile 400 or the joystick 151 in a boom energy recovery mode or a boom energy eco mode. ), Boom Energy Power Mode, Boom Energy Pressure Release Mode, and Boom Energy Recovery Off Mode. there is.

Here, the boom energy recovery mode is a basic setting mode that can be set while driving the construction machine 100, and can be set along with the general operation of the construction machine 100. That is, the construction machine 100 may be set to and operate in the boom energy recovery mode immediately after driving.

Referring to FIG. 7, an energy recovery mode in which energy is recovered by an energy recovery system for construction machinery according to an embodiment of the present invention will be described.

Specifically, the energy recovery mode is for recovering and storing the potential boom energy resulting from boom down to the accumulator 220 and then reusing the stored energy. When the boom is down, the potential stored in the accumulator 220 is used. Potential Boom Energy can be used when setting fuel saving mode and performance improvement mode.

When the boom 130 goes down, the boom down valve 164 is closed and oil flows into the small chamber 143 of the boom cylinder 140 to lower the rod 141 of the boom cylinder 140, As the rod 141 descends, the oil inside the large chamber 142 is discharged through the first line (L1).

Oil flowing in the first line (L1) flows into the accumulator 220 through the second line (L2), and the oil flowing into the accumulator 220 is used in fuel saving mode and performance improvement mode after accumulating pressure. It can be.

At this time, since the boom down valve 164 is locked, the oil does not flow toward the main control valve 160 and can be discharged only to the first line (L1).

Through this process, the potential boom energy of the boom 130 can be stored in the accumulator 220, and the fuel of the construction machine 100 can be saved by utilizing the stored potential boom energy. Or, performance can be improved.

Meanwhile, in another embodiment, the Energy Recovery Mode flows oil into the accumulator 220 when the boom is down and stores the potential boom energy of the boom 130 in the accumulator 220. In addition, the boom-down speed can be increased by flowing oil into the small chamber 143.

Specifically, when the boom 130 booms down, the AB valve (AB) is opened to allow part of the oil flowing in the first line (L1) to flow through the sixth line (L6) and the fifth line (L5). In addition to flowing into the small chamber 143 of the boom cylinder 140, the remainder of the oil flowing in the first line (L1) can be flowed into the accumulator 220 through the second line (L2).

In this way, the boom down speed of the boom 130 can be increased by rapidly lowering the rod 141 by re-introducing the oil into the small chamber 143 and the process of accumulating oil in the accumulator 220.

Here, an eighth line L8 may be further connected to the fifth line L5 and the sixth line L6. The eighth line (L8) may be connected to the oil tank (T), that is, the fourth oil tank (T4). Through the eighth line (L8), oil that has passed through the AB valve (AB) may flow into the fourth oil tank (T4).

Meanwhile, in another embodiment, in the Energy Recovery Mode, when the accumulator 220 is full of oil when the boom is down, the oil flowing into the accumulator 220 is transferred to the third oil tank T3. By bypassing, the boom down of the boom 130 can be smoothened.

Specifically, when the accumulator 220 is full of oil when the boom is down, the AR valve (AR) is opened, and a portion of the oil flowing in the first line (L1) is transferred to the third line through the seventh line (L7). It can be introduced into the oil tank (T3).

In this way, when the accumulator 220 is full of oil, the boom down of the boom 130 may no longer operate. In this case, the oil is diverted to the third oil tank (T) to lower the boom 130. Boomdown can be done smoothly

Here, the fifth sensor S5 may be disposed in the second line L2 and in front of the accumulator 220, and the fifth sensor S5 may measure the pressure in front of the accumulator 220. Therefore, it is possible to measure whether the accumulator 220 is full of oil using the fifth sensor S5.

The boom energy fuel saving mode (Boom Energy Eco Mode) is a mode that can save fuel by assisting the output of the engine using the oil accumulated in the accumulator. When explained with reference to FIG. 8, the oil accumulated when the boom is down It can be used to assist engine output when booming up.

In the boom energy fuel saving mode, when the boom 130 booms up, the first CM valve (CM1) arranged in the fourth line (L4) is opened and the CA valve (CA) arranged in the third line (L3) is opened. After closing, the oil accumulated in the accumulator 220 is introduced into the hydraulic motor 310 of the hydraulic motor assembly 300 through the open fourth line L4.

The rotation axis of the hydraulic motor 310 of the hydraulic motor assembly 300 rotates due to the inflow of oil, and the rotation axis of the hydraulic motor 310 is provided to the shaft 121 of the engine 120.

The boom energy fuel saving mode can increase the fuel efficiency of the engine 120 by assisting the output of the shaft 121 of the engine 120 by the rotational force of the rotation shaft of the hydraulic motor 310.

Meanwhile, the oil flowing into the hydraulic motor 310 may be discharged back to the first oil tank T1 through the pipe after rotating the rotation axis of the hydraulic motor 310.

The boom energy performance improvement mode (Boom Energy Power Mode) is a mode that uses the oil accumulated in the accumulator to assist the power required for the boom-up operation of the boom. When explained with reference to FIG. 9, the oil accumulated in the boom is used as a large By flowing it into the chamber 142, the rod 141 can be raised quickly.

In the boom energy performance improvement mode, when the boom 130 booms up, the CA valve (CA) arranged in the third line (L3) is opened and the first CM valve (CM1) arranged in the fourth line (L4) is opened. After closing, the oil accumulated in the accumulator 220 flows into the large chamber 142 through the third line (L3) and the first line (L1).

In addition to oil flowing into the large chamber 142 through the large chamber line 144 by the main pump 122 of the engine 130, the third line L3 and the first line (L3) from the accumulator 220 The boom-up speed can be increased by increasing the amount of oil flowing into the large chamber 142, such as by flowing oil into the large chamber 142 through L1).

In the boom energy performance improvement mode, the AB valve (AB), AR valve (AR), and boom down valve 164 are closed, and only the CA valve (CA) disposed in the third line (L3) is opened to allow oil to flow into the third line (L3). The power required for the boom-up operation can be assisted by allowing it to flow only into the large chamber 142 through the line L3 and the first line L1.

The Boom Energy Pressure Release Mode is to relieve pressure by discharging the oil accumulated in the accumulator to the outside. When explained with reference to FIG. 10, the internal pressure of the accumulator 220 is reduced. It is for.

In the boom energy pressure relief mode, the first release valve (RE1) is opened, and the CA valve (CA) of the third line (L3) and the first CM valve (CM1) of the fourth line (L4) are closed.

It is preferable that the first release valve (RE) is provided in an on/off manner to enable only a simple opening or closing operation rather than precisely controlling the oil flow rate, but is not limited to this.

In this way, by opening the first release valve (RE1), a portion of the oil accumulated in the accumulator 220 is transferred to the second oil tank (T2) through the pipe connecting the accumulator 220 and the second oil tank (T2). The internal pressure of the accumulator 220 can be reduced by discharging it.

For example, when the pressure of the oil flowing into the accumulator 220 and accumulating pressure exceeds the preset pressure range, the first release valve RE1 is always opened to allow a portion of the oil flowing into the accumulator 220 The internal pressure of the accumulator 220 can be reduced by flowing into the second oil tank (T2).

Meanwhile, when maintaining the construction machine 100, the first solenoid valve (SOL) is opened to allow all of the oil in the accumulator 220 to flow into the second oil tank (T2), and the pressure relief mode is set for maintenance. You can proceed.

Even at this time, the CA valve (CA) and the first CM valve (CM) are closed and then only the first solenoid valve (SOL1) is opened.

For example, when the construction machine 100 is in an idle state or when the construction machine 100, hydraulic motor assembly 300, or boom energy recovery unit 200 is being maintained, the first solenoid valve (SOL1) is By opening the oil and allowing all the oil in the accumulator 220 to flow into the second oil tank (T2) to relieve the internal pressure of the accumulator 220 and then proceed with maintenance, safety accidents, etc. can be prevented.

In this way, even during maintenance of construction machinery, the first release valve (RE1) is opened to allow part of the oil flowing into the accumulator 220 to flow into the second oil tank (T2) to lower the pressure of the accumulator 220. relieve the pressure in the accumulator 220 by opening the first solenoid valve (SOL1) and allowing all of the oil flowing into the accumulator 220 to flow into the second oil tank (T2), or release the pressure in the accumulator 220 by opening the first solenoid valve (SOL1) The pressure in the accumulator can be relieved by opening both (RE1) and the first solenoid valve (SOL1).

Here, when the first release valve (RE1) is opened, the first solenoid valve (SOL1) may be closed, and similarly, when the first solenoid valve (SOL1) is opened, the first release valve (RE1) may be closed.

Boom Energy Recovery Off Mode can temporarily stop the operation in which potential boom energy generated by boom down is recovered to the accumulator.

That is, when explaining with reference to FIGS. 2 and 7, while the boom down of the boom 130 is in progress, if the boom 130 touches the ground and a greater force is required to bring down the boom 130, the accumulator Oil accumulation pressure at (220) can be stopped.

At this time, the third sensor (S3) and the fourth sensor (S4) may be placed on the first line (L1) and the fifth line (L5), and the third sensor (S3) and fourth sensor (S4) are always Oil pressure can be measured, and the measured oil pressure value can be transmitted to the control unit 170.

The control unit 170 can determine whether the boom 130 has reached the ground through these measurement values.

Specifically, when the control unit 170 determines that the boom 130 has touched the ground, the first AC valve (AC1) of the second line (L2) connected to the accumulator 220 is closed, and the accumulator 220 is closed. ) You can temporarily stop the accumulated pressure of your oil.

In addition, in the boom energy recovery off mode, when the control unit 170 determines that the boom 130 has reached the ground, both the first AC valve (AC1) and the AR valve (AR) are closed, and AB By opening the valve AB to allow the oil discharged from the large chamber 142 to flow only into the small chamber 143, the accumulated pressure of oil in the accumulator 220 can be temporarily stopped.

That is, the first AC valve (AC1) disposed in the second line (L2) and the AR valve (AR) disposed in the seventh line (L7) are closed, and the AB valve (AB) disposed in the sixth line (L6) is closed. ) can be controlled to open only so that all the oil discharged from the large chamber 142 flows into the small chamber 143.

Meanwhile, the swing energy recovery unit 500 includes a high pressure accumulator 510, a swing energy valve assembly 530, a low pressure accumulator 520, and an oil tank (T), and the driving unit of the construction equipment 100 (Not shown) Connected to one or more of the main pumps 122 of the main body 110 and the engine 120, which are installed at the top and pivot and move in the horizontal direction by driving the swing motor 501. It can be installed.

Specifically, the high pressure accumulator 510 is connected to the main pump 122 of the engine 120 to accumulate oil flowing in as the swing motor 501 rotates, and to transfer the accumulated oil to the hydraulic motor assembly 300. It can be discharged to assist the output of the engine 310.

The low pressure accumulator 520 is connected to the swing motor 501 connected to the main pump 122 of the engine 120 and provides oil to the swing motor 501 to prevent cavitation of the swing motor 501. there is.

The swing energy valve assembly 530 may include a plurality of lines to allow oil to flow and at least one valve installed in one or more lines selected from the plurality of lines to control the flow rate of oil.

Specifically, the swing energy valve assembly 530 is connected to the 11th line (L11) on one side connected to the main pump 122, the other side of the 11th line (L11), and connected to the left side of the swing motor 501. The 12th line (L12), the 13th line (L13) connected to the other side of the 11th line (L11) and the right side of the swing motor 501, and the 14th line (L14) branched from the 12th line (L12) ), merging the 15th line (L15), 14th line (L14), and 15th line (L15) branched from the 13th line (L13), but including a 16th line (L16) connected to the high pressure accumulator. You can.

A direction change valve 539 that controls the flow direction of oil may be disposed at the connection portion of the 11th line (L11) and the 12th and 13th lines (L12, L13), and the high pressure shaft may be located in the 16th line (L16). A second AC valve AC2 may be disposed to control the flow rate of oil so that the oil flows only toward the compressor 510.

The direction change valve 539 is installed with direction change joysticks 503a and 503b respectively connected to control the flow direction of oil through the 11th line (L11) to the 12th line (L12) or 13th line (L13). It can be.

By controlling the direction change valve 539, the oil flowing into the swing motor 501 through the 11th line (L11) is transferred to the swing motor (L12) through the 12th line (L12) connected to the left side of the swing motor (501). 501), the main body 110 can be rotated to the right with respect to the drive unit by changing the direction to rotate the swing motor 501 to the right, and also the swing motor 501 through the 11th line (L11). The oil flowing into (501) is directed to flow into the right side of the swing motor (501) through the 13th line (L13) connected to the right side of the swing motor (501) to rotate the swing motor (501) to the left. By switching, the main body can be turned to the left with respect to the driving unit.

The swing energy valve assembly 530 may include a 17th line (L17) connecting the high pressure accumulator 510 and the hydraulic motor 310 of the hydraulic motor assembly 300. A second CM valve (CM2) for controlling the flow rate of oil may be disposed in the 17th line (L17).

Accordingly, the oil accumulated in the high pressure accumulator 510 flows into the hydraulic motor 310 through the 17th line (L17), and the second CM valve (CM2) operates the hydraulic motor 310 from the high pressure accumulator 510. ) It may be a release valve that releases oil to rotate the hydraulic motor 310.

The swing energy assembly 530 may include a first check valve 531 and a second check valve 532 that control the flow rate of oil in the 14th line L14 and the 15th line 15. In addition, the 6th sensor S6 and the 7th sensor S7 are disposed in the 14th line L14 and the 15th line 15 to control the oil flowing in the 14th line L14 and the 15th line 15. Pressure can be measured.

Accordingly, the control unit 170 performs the first and second checks according to the pressure of the oil flowing through the 14th line (L14) and the 15th line (15) through the 6th sensor (S6) and the 7th sensor (S7). Valves 531 and 532 can be selectively opened and closed.

In addition, an 8th sensor S8 is disposed in the 16th line L16, and the 8th sensor S8 can measure the pressure of the oil flowing in the 16th line L16, and the measured oil pressure is Accordingly, the second AC valve (AC2) can be selectively opened and closed.

The swing energy assembly 530 may include an 18th line (L18) branched from the 17th line (L17) and connected to the fifth oil tank (T5), which will be described later. A second release valve RE2 operating in an on/off manner may be disposed between the high pressure accumulator 510 and the fifth oil tank T5 in the 18th line L18.

Additionally, a second solenoid valve (SOL2) disposed in parallel with the second release valve (RE2) may be included between the high pressure accumulator 510 and the fifth oil tank (T5) in the 18th line (L18).

The swing energy assembly 53 includes a 21st line (L21) connecting the 12th line (L12) and the 13th line (L13), and a 21st line (L21) branched from the 21st line (L21) and connected to the 6th oil tank (T6). It may further include 22 lines (L22).

A first relief valve 537 and a second relief valve 538 may be disposed in the 21st line L21 at regular intervals from each other and opened by oil pressure to control the flow rate of oil. A fifth check valve 535 may be disposed in the 22nd line L22.

When the turning movement of the main body 110 is accelerated, a large amount of oil may be initially supplied to the swing motor 501.

Therefore, when the pressure of the oil flowing into the 12th line (L12) or the 13th line (L13) through the 11th line (L11) exceeds the preset oil pressure range, the first relief valve 537 Alternatively, the second relief valve 538 may be opened automatically, and a portion of the oil flowing into the swing motor 501 through the 12th line (L12) or 13th line (L13) may be transferred to the first relief valve 537. Alternatively, it may bypass and flow into the sixth oil tank (T6) through the second relief valve 538 and the 22nd line (L22).

Additionally, the first relief valve 537 and the second relief valve 538 may be opened and closed by the control unit 170 when the oil pressure exceeds a preset range.

The swing energy assembly 530 includes a 23rd line (L23) connecting the 12th line (L12) and the 13th line (L13), and a 24th line branched from the 23rd line (L23) and connected to the low pressure accumulator 520. It may further include a line (L24).

A third check valve 533 and a fourth check valve 534 that control the flow rate of oil may be disposed at a certain distance from each other in the 23rd line L23.

When the turning movement of the main body 110 is slowed down or stopped, the amount of oil supplied to the swing motor 501 must be reduced or stopped. At this time, the oil that rotates the swing motor 501 flows to the high pressure accumulator 510, but since the swing motor 501 immediately decelerates or rotates without stopping, the oil and main oil that come out after rotating the swing motor 501 If there is no additional oil supplied from the pump 122 to the swing motor 501, cavitation may occur in the swing motor 501.

Therefore, when decelerating the turning movement of the main body 110, the flow flows into the swing motor 501 through the 12th line (L12) or the 13th line (L13) to rotate the swing motor 501, and then the high pressure accumulator ( In place of the oil escaping through 510), after opening the third check valve 533 or fourth check valve 534, the oil of the low pressure accumulator 520 is supplied to the 24th line (L24) and the third check valve ( Cavitation of the swing motor 501 can be prevented by providing it to the swing motor 501 through 533) or the fourth check valve 534.

The oil tank (T) may be provided with at least one oil tank (T) to allow oil to flow in and store it, or to allow the stored oil to flow out. Specifically, the oil tank T may include a fifth oil tank T5 connected to the 18th line L18 and a sixth oil tank T6 connected to the 22nd line L22.

The control unit 170 controls the operation of the swing energy recovery unit 500 based on the operation signal from the mobile 400 or the joystick 151 to recover the oil resulting from the rotation of the main body 110 to the high pressure accumulator. Swing Energy Recovery Mode, which stores swing energy fuel saving mode (Swing Energy Eco Mode), which assists the output of the engine 120 with oil accumulated in the high pressure accumulator 510, and high pressure accumulator 510 ) can be operated in any selected mode among the swing energy pressure release mode (Swing Energy Pressure Release Mode), which relieves the pressure inside the high pressure accumulator 510 by discharging the oil accumulated in the pressure to the outside.

Swing Energy Recovery Mode controls the operation of the swing energy recovery unit 500 to recover and store oil resulting from the swing of the main body 110 to the high pressure accumulator 510 and then reuse the stored energy. For this purpose, the turning energy stored in the high pressure accumulator 510 can be used in the turning energy fuel saving mode.

In the swing energy recovery mode, when the main body 110 rotates, oil flows from the main pump 122 to the swing motor 501, and the swing motor 501 is rotated by the oil flowing into the swing motor 501. , the oil that rotates the swing motor 501 can be recovered and stored in the high pressure accumulator 510. The oil recovered in the high pressure accumulator 510 can be stored by accumulating pressure and then used in a turning energy fuel saving mode.

Specifically, referring to FIG. 11, when the main body 110 is turned to the right, oil flows in from the main pump 122 to the 11th line (L11) in the swing energy recovery mode, and the direction The direction change valve 539 is selectively controlled using the change joysticks 503a and 503b to change the flow direction of oil to the twelfth line L12 to allow oil to flow.

The oil flowing into the 12th line (L12) rotates the swing motor 501 to the right, and thus the oil that turns the main body 110 to the right flows through the 13th line (L13) to the 14th line ( L14), the oil flowing in the 14th line (L14) is recovered to the high pressure accumulator 510 through the 16th line (L16), and the oil recovered into the high pressure accumulator 510 is accumulated and stored. You can use it later.

In addition, referring to FIG. 12, when the main body 110 is turned to the left, oil flows from the main pump 122 to the 11th line (L11) in the swing energy recovery mode, and the direction is changed. By selectively controlling the direction change valve 539 using the joysticks 503a and 503b, the flow direction of the oil is switched to the 13th line L13 and the oil is introduced.

The oil flowing into the 13th line (L13) rotates the swing motor 501 to the left, and thus the oil that turns the main body 110 to the left is sent to the 15th line (L12) through the 12th line (L12). Oil flows to L15), and the oil flowing to the 15th line (L15) is recovered to the high pressure accumulator 510 through the 16th line (L16), and the oil recovered into the high pressure accumulator 510 is accumulated. You can use it after saving it.

13, the swing energy fuel saving mode (Swing Energy Eco Mode) opens the second CM valve (CM2) disposed in the 17th line (L17) when the main body 110 turns, and high pressure The oil accumulated in the accumulator 510 is introduced into the hydraulic motor 310 of the hydraulic motor assembly 300 through the 17th line (L17).

The rotation shaft of the hydraulic motor 310 rotates due to the oil flowing into the hydraulic motor 310, and the rotational force of the rotation shaft is provided to the shaft 121 of the engine 120 to assist the shaft output of the engine 120. .

The turning energy fuel saving mode can increase the fuel efficiency of the engine 120 by assisting the output of the shaft 121 of the engine 120 by the rotational force of the rotating shaft of the hydraulic motor 310.

Even at this time, the oil flowing into the hydraulic motor 310 may be discharged to the first oil tank T1 through the pipe again after rotating the rotation axis of the hydraulic motor 310.

14, the swing energy pressure release mode opens the second release valve (RE2), and the pressure accumulated in the high pressure accumulator 510 through the second release valve (RE2) The pressure inside the high pressure accumulator 510 can be reduced by discharging part of the oil into the fifth oil tank (T5).

In addition, the swing energy pressure release mode opens the second solenoid valve (SOL2) and releases all of the oil accumulated in the high pressure accumulator 510 through the second solenoid valve (SOL2) to the fifth solenoid valve (SOL2). The pressure inside the high pressure accumulator 510 can be reduced by discharging it into the oil tank (T5).

When the construction machine 100 is not in operation, or when the construction machine 100, the hydraulic motor assembly 300, or the swing energy recovery unit 500 is being maintained, the second release valve (RE2) is opened to open the high pressure shaft. Part of the oil in the compressor 510 is discharged to the oil tank (T) to reduce the pressure inside the high pressure accumulator 510, or the oil in the high pressure accumulator 510 is reduced by opening the second solenoid valve (SOL2). Safety accidents, etc. can be prevented by discharging all of the oil into the oil tank (T) to relieve the internal pressure of the high pressure accumulator (510) and then proceed with maintenance.

Meanwhile, the oil flow process during acceleration of the turning movement of the main body 110 will be described. 15, the main body 110 is pivoted, and when the main body 110 accelerates to turn to the right, oil flows from the main pump 122 to the 11th line L11, and the direction change joystick The direction change valve 539 is selectively controlled through (503a, 503b) to change the oil flow direction to the twelfth line (L12) to allow oil to flow.

If the pressure of the oil flowing into the 12th line (L12) exceeds the preset oil pressure range, the first relief valve 537 is opened, and the swing motor ( Some of the oil flowing into 501) may bypass and flow into the sixth oil tank (T6) through the first relief valve 537 and the 22nd line (L22).

At this time, the fifth check valve may be opened to allow part of the oil flowing into the 22nd line (L22) to flow into the oil tank (T).

For example, when the pressure of the oil flowing into the twelfth line (L12) exceeds the preset reference pressure value of 280 Bar and is 330 Bar, the first relief valve 537 is opened, and the swing motor 501 ) Some of the oil flowing into the oil bypasses and flows into the sixth oil tank (T6) through the first relief valve (537) and the second line (L22), and some of the remaining oil rotates the swing motor (501). Afterwards, it can be recovered to the high pressure accumulator 510 and accumulated pressure.

In addition, when the main body 110 accelerates to turn in the left direction, oil flows from the main pump 122 to the 11th line (L11), and the direction change valve 539 is selectively activated through the direction change joysticks 503a and 503b. By controlling the flow direction of the oil to the 13th line (L13), oil is introduced.

If the pressure of the oil flowing into the 13th line (L12) exceeds the preset oil pressure range, the second relief valve 538 is opened, and the swing motor ( Some of the oil flowing into 501) may bypass and flow into the sixth oil tank (T6) through the second relief valve 537 and the 22nd line (L22).

Meanwhile, the oil flow process during deceleration of the turning movement of the main body 110 will be described. Referring to FIG. 16, when the main body 110 is decelerated or stopped, and the rightward turning movement of the main body 110 is decelerated or stopped, it flows into the swing motor 501 through the 12th line (L12) and swing motor ( After rotating 501) to the right, the oil flowing into the high pressure accumulator 510 is replaced, and the third check valve 533 is opened, and then the oil of the low pressure accumulator 520 is transferred to the 24th line (L23). It flows into the 23rd line (L23) through the third check valve (533).

The oil flowing into the 23rd line (L23) flows into the left side of the swing motor 501 through the 12th line (L12), thereby supplying the oil of the low pressure accumulator 520 to the swing motor 501 rotating in the right direction. Thus, cavitation of the swing motor 501 can be prevented.

Meanwhile, when the leftward turning movement of the main body decelerates or stops, oil flows into the swing motor 501 through the 13th line (L13), rotates the swing motor 501 to the left, and then flows into the high pressure accumulator 510. Instead, after opening the fourth check valve 534, the oil of the low pressure accumulator 520 flows into the 23rd line (L23) through the 24th line (L24) and the fourth check valve 534.

The oil flowing into the 23rd line (L23) flows into the right side of the swing motor 501 through the 13th line (L13), thereby supplying the oil of the low pressure accumulator 520 to the swing motor 501 rotating in the left direction. Thus, cavitation of the swing motor 501 can be prevented.

Above, an embodiment of the present invention has been described, but those skilled in the art can add, change, delete or add components without departing from the spirit of the present invention as set forth in the patent claims. The present invention may be modified and changed in various ways, and such modifications and changes will also be included within the scope of the rights of the present invention.

100: Construction machinery
110: main body
120: engine
121: shaft
122: main pump
123: Auxiliary pump
130: boom
140: Boom cylinder
141: load
142: Large chamber
143: Small chamber
144: Large chamber line
145: Small chamber line
150: cabinet
151: Joystick
160: Main control valve
161: spool
162: Main valve line
163: Boom up valve
164: Boom down valve
165: Boom-up valve line
166: Boom down valve line
170: control unit
200: Boom energy recovery unit
210: bracket
211: mount
212: Ministry of SMEs and Startups
213: Home Department
220: accumulator
230: Boom energy valve assembly
240: main piping
241: Joint block
250: Pilot piping
300: Hydraulic motor assembly
310: Hydraulic motor
400: mobile
500: Swinging energy recovery unit
501: swing motor
503a, 503b: direction change joystick
510: High pressure accumulator
520: low pressure accumulator
530: Swing energy valve assembly
531: first check valve
532: second check valve
533: Third check valve
534: Fourth check valve
535: Fifth check valve
537: first relief valve
538: second relief valve
539: Directional valve
CA: CA valve
CM1: 1st CM valve
CM2: 2nd CM valve
AC1: 1st AC valve
AC2: 2nd AC valve
AB: AB valve
AR: AR valve
RE1: first release valve
RE2: Second release valve
SOL1: 1st solenoid valve
SOL2: 2nd solenoid valve
L1: first line
L2: 2nd line
L3: third line
L4: 4th line
L5: 5th line
L6: 6th line
L7: 7th line
L8: 8th line
L11: Line 11
L12: Line 12
L13: Line 13
L14: Line 14
L15: Line 15
L16: Line 16
L17: Line 17
L21: Line 21
L22: Line 22
L23: Line 23
L24: Line 24
S1: first sensor
S2: second sensor
S3: Third sensor
S4: 4th sensor
S5: Fifth sensor
S6: 6th sensor
S7: 7th sensor
S8: 8th sensor
T: Oil tank
T1: 1st oil tank
T2: Second oil tank
T3: Third oil tank
T4: 4th oil tank
T5: Fifth oil tank
T6: 6th oil tank

Claims (25)

A boom cylinder in which a rod moves up and down by the flow of oil, includes a large chamber and a small chamber formed on the upper part of the large chamber, and an engine that provides a flow of oil to the boom cylinder and is connected to the main pump by a shaft. It is installed on a construction machine including a boom that drives the boom up/boom down by a boom cylinder by the flow of oil, and a main body that is installed on the upper part of the construction machine drive unit and moves in a horizontal direction by driving a swing motor to provide energy. In the energy recovery system for construction machinery that recovers,
A main control valve connected to the boom cylinder to selectively control the flow of oil provided to the boom cylinder;
A hydraulic motor assembly that is connected to the engine and generates rotational force by oil flowing in, and includes a hydraulic motor that is connected to the shaft of the engine through a rotation axis to provide rotational force, and at least one pipe for inflowing and discharging oil;
A boom energy recovery unit that recovers oil discarded when the boom cylinder is brought down;
a turning energy recovery unit that recovers oil discarded during the turning movement of the main body;
mobile users have; and
A control unit linked to the mobile and controlling the operation of construction equipment based on operation signals;
Including,
A boom energy and swing energy recovery system for mobile interlocking construction equipment, characterized in that it reuses the boom energy generated through the oil recovered by the boom energy recovery unit and the swing energy generated by the oil recovered by the swing energy recovery unit.
In claim 1,
The main control valve is,
A spool that operates to direct the flow of oil to the large chamber or small chamber of the cylinder, a main valve line that flows oil to the main control valve, and a boom-up valve connected to the spool and arranged to operate according to the opening of the boom-up valve. A boom-up valve line that causes oil to flow into the large chamber by the movement of the spool and boom-up the boom, and a boom-down valve connected to the spool, are disposed to move the spool according to the opening of the boom-down valve to the small chamber. An energy recovery system for mobile interlocking construction machinery, characterized in that it includes a boom-down valve line that causes oil to flow and boom-down the boom.
In claim 2,
The boom energy recovery unit,
An accumulator connected to the boom cylinder to accumulate oil flowing in from the boom cylinder and discharging the accumulated oil to the boom cylinder and the engine, a plurality of lines through which oil flows, and at least one line selected from the plurality of lines. A mobile device characterized in that it includes a boom energy valve assembly including a valve installed to control the flow rate of oil, and at least one oil tank to allow oil to flow in and be stored, or to allow the stored oil to flow out. Boom energy and swing energy recovery system for interlocking construction equipment.
In claim 3,
The boom energy valve assembly is,
A first line connected on one side to the large chamber of the boom cylinder, a second line connecting the first line and an accumulator, a third line connecting the first line and the accumulator, and the accumulator A fourth line connecting the hydraulic motor assembly, a fifth line connected on one side to the small chamber of the boom cylinder, a sixth line branched from the first line and connected to the fifth line, and the first line It includes a seventh line branching from the line, and an eighth line connected on one side to the fifth and sixth lines,
A first AC valve disposed in the second line and controlling the oil flow rate so that the oil flows only toward the accumulator; and a first AC valve disposed in the third line and controlling the oil flow rate so that the oil flows only toward the first line. a CA valve disposed in the fourth line to control the oil flow rate, a first CM valve disposed in the sixth line to control the oil flow rate, and an AB valve disposed in the seventh line to control the oil flow rate. an AR valve for controlling, a first release valve disposed on the flow path between the accumulator and the oil tank and operating in an on-off manner, and a first release valve disposed in parallel with the first release valve between the accumulator and the oil tank. 1 Boom energy and swing energy recovery system for mobile interlocking construction equipment, comprising a solenoid valve.
In claim 4,
The control unit,
Based on the operation signal,
A boom energy recovery mode that controls the operation of the boom energy recovery unit to recover and store oil according to the boom down in the accumulator, and supports the output of the engine with the oil accumulated in the accumulator. A boom energy fuel saving mode (Boom Energy Eco Mode), a boom energy performance improvement mode (Boom Energy Power Mode) that uses oil accumulated in the accumulator to provide power required for boom-up operation, and a boom energy performance improvement mode (Boom Energy Power Mode) that uses oil accumulated in the accumulator to provide power required for boom-up operation, and a boom energy performance improvement mode that uses oil accumulated in the accumulator to provide power required for boom-up operation. Boom Energy Pressure Release Mode, which relieves the pressure inside the accumulator by discharging the accumulated oil to the outside, and Boom Energy Recovery Off mode, which temporarily suspends the accumulator pressure when the boom touches the ground. Boom energy and swing energy recovery system for mobile interlocking construction equipment, characterized in that it operates in any one mode selected from (Off Mode).
In claim 5,
The boom energy recovery mode (Boom Energy Recovery Mode),
When the boom booms down,
After closing the boom down valve, oil flows into the small chamber of the boom cylinder to lower the rod of the boom cylinder,
Discharging the oil inside the large chamber through the first line,
Recovering the oil flowing in the first line to the accumulator through the second line,
A boom energy and swing energy recovery system for mobile linked construction machinery, characterized in that the oil recovered in the accumulator is stored and utilized.
In claim 5,
The boom energy recovery mode (Boom Energy Recovery Mode),
By opening the AB valve, a portion of the oil flowing in the first line flows into the small chamber of the boom cylinder through the sixth line and the fifth line, thereby increasing the boom down speed of the boom. Boom energy and swing energy recovery system for interlocking construction equipment.
In claim 5,
The boom energy recovery mode (Boom Energy Recovery Mode),
A boom energy and swing energy recovery system for mobile linked construction machinery, characterized in that by opening the AR valve, a portion of the oil flowing in the first line flows into the oil tank through the seventh line.
In claim 5,
The boom energy fuel saving mode (Boom Energy Eco Mode),
When the boom booms,
Opening the first CM valve disposed in the fourth line and closing the CA valve disposed in the third line,
The oil accumulated in the accumulator flows into the hydraulic motor of the hydraulic motor assembly through the fourth line,
The rotating shaft of the hydraulic motor rotates due to the inflow of oil,
A boom energy and swing energy recovery system for mobile linked construction equipment, characterized in that the rotational force of the rotation shaft of the hydraulic motor is provided to the shaft of the engine to assist the shaft output of the engine.
In claim 5,
The boom energy performance improvement mode (Boom Energy Power Mode),
When the boom booms,
Opening the CA valve disposed in the third line and closing the first CM valve disposed in the fourth line,
The oil accumulated in the accumulator flows into the large chamber of the boom cylinder through the third line and the first line,
In addition to the oil flowing into the large chamber by the engine, oil flows into the large chamber from the accumulator to increase the amount of oil flowing into the large chamber, thereby increasing the spring boom-up speed. Mobile interlocking construction. Boom energy and slewing energy recovery systems for machinery.
In claim 5,
The boom energy pressure release mode (Boom Energy Pressure Release Mode),
Opening the first release valve and closing the CA valve and the first CM valve,
Boom energy and swing energy recovery system for mobile interlocking construction equipment, characterized in that the pressure inside the accumulator is reduced by discharging a part of the oil accumulated in the accumulator to the oil tank through the first release valve.
In claim 5,
The boom energy pressure release mode (Boom Energy Pressure Release Mode),
Opening the first solenoid valve and closing the CA valve and the first CM valve,
A boom energy and swing energy recovery system for mobile linked construction equipment, characterized in that all of the oil accumulated in the accumulator is discharged to the oil tank through the first solenoid valve to reduce the pressure inside the accumulator.
In claim 5,
The boom energy recovery off mode (Boom Energy Recovery Off Mode),
When the boom touches the ground,
A boom energy and swing energy recovery system for mobile linked construction equipment, characterized in that the accumulating pressure of oil in the accumulator is temporarily stopped by closing the first AC valve.
In claim 5,
The boom energy recovery off mode (Boom Energy Recovery Off Mode),
When the boom touches the ground,
Close the first AC valve and AR valve,
A boom energy and swing energy recovery system for mobile linked construction equipment, characterized in that the AB valve is opened to allow oil discharged from the large chamber to flow only into the small chamber.
In claim 1,
The swing energy recovery unit,
A high-pressure accumulator that is connected to a swing motor connected to the main pump of the engine to accumulate oil flowing in as the swing motor rotates and discharges the accumulated oil to the hydraulic motor assembly, and is connected to the main pump of the engine. A low pressure accumulator is connected to the swing motor and provides oil to the swing motor to prevent cavity of the swing motor, and is installed in a plurality of lines to allow oil to flow and at least one line selected from the plurality of lines to allow oil to flow. Boom energy and swing for a mobile linked construction machine, comprising a swing energy valve assembly including a valve for controlling the flow rate, and at least one oil tank to allow oil to flow in and be stored, or to allow the stored oil to flow out. Energy recovery system.
In claim 15,
The swing energy valve assembly,
An 11th line connected on one side to the main pump, a 12th line connected to the other side of the 11th line and connected to the left side of the swing motor, and a 12th line connected to the other side of the 11th line and to the right side of the swing motor. A 13th line connected, a 14th line branched from the 12th line, a 15th line branched from the 13th line, the 14th line and the 15th line are merged, and the 14th line is connected to a high pressure accumulator. It includes a 16th line, a 17th line connecting the high pressure accumulator and a hydraulic motor, and an 18th line branched from the 17th line and connected to the oil tank,
A direction change valve disposed at the connection portion of the 11th line and the 12th and 13th lines to control the flow direction of the oil, and a direction change valve disposed in the 16th line to flow the oil only toward the high pressure accumulator. a second AC valve that controls, a second CM valve disposed in the 17th line to control the flow rate of oil, and first and second valves disposed in the 14th and 15th lines to control the flow rate of oil. a check valve, a second release valve disposed between the high temperature accumulator of the 18th line and the oil tank and operating in an on-off manner, and the second release valve between the high pressure accumulator of the 18th line and the oil tank) A boom energy and swing energy recovery system for mobile interlocking construction machinery, comprising a second solenoid valve (SOL2) disposed in parallel.
In claim 16,
The control unit,
Based on the operation signal,
Swing Energy Recovery Mode, which controls the operation of the swing energy recovery unit to recover and store oil according to the rotation of the main body to the high pressure accumulator, and outputs the engine using the oil accumulated in the high pressure accumulator. Among the auxiliary swing energy fuel saving mode (Swing Energy Eco Mode), and the swing energy pressure release mode (Swing Energy Pressure Release Mode) that relieves the pressure inside the high pressure accumulator by discharging the oil accumulated in the high pressure accumulator to the outside. A boom energy and swing energy recovery system for mobile interlocked construction machinery, characterized in that it operates in any one selected mode.
In claim 17,
The swing energy recovery mode (Swing Energy Recovery Mode),
When the main body rotates,
Inflowing oil from the main pump into the 11th line,
Controlling the direction change valve to change the flow direction of oil to the 12th line or 13th line to introduce oil,
The swing motor is rotated to the right or left by the oil flowing into the 12th or 13th line, and then flows into the 14th or 15th line through the 13th or 12th line,
The oil flowing into the 14th or 15th line is recovered to the high pressure accumulator through the 16th line,
A boom energy and swing energy recovery system for mobile linked construction machinery, characterized in that the oil recovered in the high pressure accumulator is stored and utilized.
In claim 17,
The swing energy fuel saving mode (Swing Energy Eco Mode),
When the main body rotates,
Opening the second CM valve disposed in the 17th line,
The oil accumulated in the high pressure accumulator flows into the hydraulic motor of the hydraulic motor assembly through the 17th line,
The rotating shaft of the hydraulic motor rotates due to the inflow of oil,
A boom energy and swing energy recovery system for mobile interlocking construction equipment, characterized in that the rotational force of the rotation shaft is provided to the shaft of the engine to assist the shaft output of the engine.
In claim 17,
The swing energy pressure release mode is,
A mobile linked construction equipment boom, characterized in that the pressure inside the high pressure accumulator is reduced by opening the second release valve and discharging part of the oil accumulated in the high pressure accumulator into the oil tank through the second release valve. Energy and swing energy recovery systems.
In claim 17,
The swing energy pressure release mode is,
Boom energy for mobile interlocking construction equipment, characterized in that the pressure inside the high pressure accumulator is reduced by opening the second solenoid valve and discharging all of the oil accumulated in the high pressure accumulator into the oil tank through the second solenoid valve. and a swing energy recovery system.
In claim 16,
The swing energy valve assembly,
It further includes a 21st line connecting the 12th line and the 13th line, and a 22nd line branched from the 21st line and connected to the oil tank,
A first relief valve and a second relief valve disposed at a predetermined distance from each other in the 21st line and opened by oil pressure to control the flow rate of oil, and disposed in the 22nd line to control the flow rate of oil A boom energy and swing energy recovery system for mobile interlocking construction machinery, comprising a fifth check valve.
In claim 22,
The control unit,
When the turning movement of the main body is accelerated and the pressure of the oil flowing into the 12th or 13th line through the 11th line exceeds the preset oil pressure range,
the first relief valve or the second relief valve is opened,
A portion of the oil flowing into the swing motor through the 12th line or the 13th line flows into the 22nd line through the 21st line and the first relief valve or the 21st line and the second relief valve,
A boom energy and swing energy recovery system for mobile interlocking construction equipment, characterized in that opening the fifth check valve to allow a portion of the oil flowing into the 22nd line to flow into the oil tank.
In claim 16,
The swing energy valve assembly,
It further includes a 23rd line connecting the 12th line and the 13th line, and a 24th line branched from the 23rd line and connected to a low pressure accumulator,
A boom energy and swing energy recovery system for mobile interlocking construction equipment, which is disposed at a certain distance from each other in the 23rd line and includes a third check valve and a fourth check valve for controlling the flow rate of oil.
In claim 24,
The control unit,
When decelerating the turning movement of the main body,
By replacing the oil that flows into the swing motor through the 12th or 13th line, rotates the swing motor, and then flows into the high pressure accumulator,
After opening the third check valve or the fourth check valve, the oil of the low pressure accumulator flows into the 23rd line through the 24th line and the third check valve or the fourth check valve,
A boom energy and swing energy recovery system for mobile linked construction equipment, characterized in that the oil flowing into the 23rd line flows into the swing motor through the 12th or 13th line to prevent cavity of the swing motor.

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