JP2000064352A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct the lifting-lowering works of a freight from the ground to the upper section of a building efficiently and safely by installing a freight lifting device on a large-sized construction machine, etc. SOLUTION: A revolving super structure 2 is mounted rotatably on a lower travelling body 1, and a building 4, a cab 5, a counter weight 6, etc., are set up onto the revolving frame 3 of the revolving super structure 2. A freight lifting device 11 is fitted to the building 4 of the revolving super structure 2 while being placed near the cab 5. When the lifting-lowering works of a freight are conducted, a lifting-lowering base for the freight lifting device 11 is lifted and lowered between the ground side and the lifting device 11 by operating the freight lifting device 11 on the building 4 by a driver etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine suitable for use as, for example, a large hydraulic excavator in which a building of an upper swing body is located at a high position above the ground.

[0002]

2. Description of the Related Art Generally, a construction machine such as a large hydraulic excavator is provided with a lower traveling body, an upper revolving body which is rotatably provided on the lower traveling body and accommodates a power source in a building, and the upper revolving body. And a working device provided on the body.

In a large-sized hydraulic excavator according to this type of prior art, a building is provided on a revolving frame of an upper revolving structure, and this building has a building cover arranged on the rear side and a support arranged on the front side. It comprises a cover and steps arranged on the building cover to form the upper surface side of the building. A machine room accommodating a prime mover and the like is formed in the building cover, and a cab having a driver's cab inside is provided on the support cover, and the cab is arranged at a height almost equal to the steps of the building. Has been done.

In this case, in a large hydraulic excavator, the lower traveling body and the upper revolving body are formed large, and in addition, a plurality of prime movers for driving huge buckets are often arranged in the machine room. The building is also large.

As a result, the upper surface side of the building is often at a high position, for example, 10 m or more from the ground. Therefore, in the prior art, the cab is arranged at a high place corresponding to the building so that the driver's view at the work site is high. Is ensured. In addition, a ladder, a handrail, etc. for moving up and down from the ground to the top of the building are provided on the side surface of the building.

When operating the hydraulic excavator, first, the driver climbs onto the building of the upper revolving structure using the ladder, the handrail, etc., and gets on the operator's cab to perform civil engineering work and the like. In this case, the driver spends a lot of effort to move up and down to the cab at a high place, so at the start of the civil engineering work, it is not necessary to descend to the ground side until the end of the work, for example, a tool for maintenance, It is common to carry documents such as documents describing work contents, daily necessities such as food and drinks, etc. that are considered necessary during civil engineering work and climb to the cab.

[0007]

By the way, in the above-mentioned prior art, since the driver is configured to ascend and descend from the ground to the cab at a high position by using a ladder for raising and lowering, a handrail, etc. In order to avoid returning to the ground to pick up luggage during civil engineering work, people often carry tools, daily necessities, etc. and climb up to the cab.

For this reason, when boarding the driver's cab, the driver can climb up the ladder or the like by, for example, 10 m or more while carrying luggage, and the driver is not only required to bear a heavy load when moving up and down the ladder. There is a problem that it is dangerous in bad weather such as strong wind.

If luggage on the ground side is required during the civil engineering work by the hydraulic excavator, there is another method other than the driver interrupting the civil engineering work and getting off the ground from the building top using a ladder or the like. However, there is also a problem that it takes a lot of time and labor to lift and lower the load from the ground to the driver's cab side, and the civil engineering work cannot be performed smoothly.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to easily lift and lower a load from the ground on the building of a construction machine, thereby efficiently and safely lifting and lowering the load. It is to provide a construction machine that is capable of doing so.

[0011]

In order to solve the above-mentioned problems, the present invention provides an undercarriage and an upper revolving structure which is rotatably provided on the undercarriage and accommodates a power source in a building. And a working device provided on the upper swing body.

A feature of the configuration adopted by the invention of claim 1 is that a luggage lifting device for lifting a luggage from the ground is provided on the building of the upper revolving structure, and the luggage lifting device comprises A wire drum rotatably provided in the building, an elevator provided to be connected to a wire wound around the wire drum and vertically movable between the ground and the wire drum. Therefore, it is composed of a drive means for raising and lowering the elevating table via the wire.

With the above construction, the operator of the construction machine can move the load from the ground to the top of the building by using the load lifting device without getting down from the cab provided on the upper swing body to the ground side. At this time, the elevating table can be driven by the driving means via the wire drum and the wire.

According to a second aspect of the present invention, in the luggage lifting device, the upper swivel mechanism is operated when the lifting / lowering lock position for locking the lifting / lowering operation of the lifting / lowering table is switched to the lifting / lowering operation position for lifting / lowering the lifting / lowering table. A turning restriction means for restricting the turning motion of the body is provided.

Thus, during operation of the construction machine, the turning restriction means can be held in the lift lock position to lock the operation of the load lifting device. Further, when carrying out the lifting / lowering work of the luggage during the civil engineering work or the like, by switching the turning restriction means from the lifting / lowering lock position to the lifting / lowering operation position, the luggage lifting / lowering device can be operated to carry out the lifting / lowering work of the luggage. Sometimes, the swinging motion of the upper swing body can be restricted.

Further, in the invention of claim 3, in the luggage lifting device, the lifting platform is forcibly lifted to a predetermined upper limit position when the turning restricting means is switched to the lifting lock position. A lock raising means is provided.

Thus, when the lifting and lowering work of the luggage is completed, the turning restricting means is switched to the lifting and lowering lock position, so that the lifting and lowering means can be forcibly lifted to the upper limit position by using the lock-time lifting means.

Further, according to the invention of claim 4, the load lifting device is provided with a lifting switch for variably setting a lifting direction and a lifting speed when the lifting platform is lifted and lowered, thereby carrying out the lifting work of the load. Inside, the lifting switch can be used to adjust the lifting direction and the lifting speed of the lifting table as needed.

Further, in the invention of claim 5, the upper revolving structure includes a cab located at a front corner of the building,
And a step fixed to the building near the cab, and the luggage lifting device is arranged on the step of the building.

Thus, for example, when carrying out lifting and lowering work of a load while operating a construction machine, a driver descends from a driver's cab to a step of a building and operates a load lifting device near a lift to lift and lower the load. Can be made.

Further, in the invention of claim 6, the wires are provided on both the left and right sides of the lifting table, one end side of each wire is fixed to the building side of the upper swing body, and the middle portion is the lifting table. The elevating table is supported by a roller provided on the other side, and the other end side is supported by the driving means so that the winding table can be wound and unwound via a wire drum.

Thus, during operation of the load lifting device,
Winding each wire from the wire drum using the driving means,
Unwinding can be performed, and the lift table supported by the intermediate portion of each wire can be raised and lowered.

Further, in the invention of claim 7, a cab having a driver's seat inside is provided in the upper revolving superstructure, and the turning restriction means is located inside the cab between the driver's seat and the doorway. An operating lever for switching is provided, and when the operating lever is tilted to a blocking position for blocking between the driver's seat and the entrance / exit, the turning restricting means is switched to a lift lock position, and the driver's seat and the entrance / exit When the tilting operation is performed to the opening position for opening the path between and, the turning restriction means is switched to the lifting operation position.

As a result, when the operation lever is tilted to the shut-off position, the turning restricting means is switched to the up / down lock position, and the driver is forced to stay in the driver's seat with the operation lever in the way. Since it is held, it is possible to prevent the driver from leaving the driver's seat even though the upper-part turning body is in a turnable state. Further, when the operation lever is tilted to the open position, the turning restricting means is switched to the raising / lowering operation position, and the driver can stand up outside the cab, so that the driver can load the luggage on the building. Lifting work can be performed.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION A construction machine according to an embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 9 by taking a large hydraulic excavator as an example.

Reference numeral 1 is a lower traveling body of the hydraulic excavator, 2 is an upper revolving body mounted on the lower traveling body 1 so as to be rotatable.
As shown in FIG. 3, a building 4 and a cab 5, which will be described later, and a counterweight 6 are provided on the rear side of the building 4. Further, a working device (not shown) including a boom for excavation work, an arm, a bucket, etc. is attached to the center of the front side of the revolving frame 3 so as to be able to move up and down.

Reference numeral 4 denotes a substantially box-shaped building provided on the revolving frame 3, and the building 4 is provided on a rear side of a building cover 4A and on a front corner of the building cover 4A. It is arranged on the support cover 4B and the building cover 4A,
It is composed of a step 4C and the like on the upper surface side of the building 4.

Here, inside the building cover 4A, a prime mover E (see FIG. 7) which is a power source of the hydraulic excavator, a hydraulic pump driven by the prime mover E, a radiator, a fuel tank, and a hydraulic oil tank (all of which are shown). A machine room accommodating (not shown) and the like is formed.

On the support cover 4B, there is provided a substantially box-shaped cab 5 in which a driver's cab is formed. The cab 5 is located at a height of 10 m or more from the ground, for example.
It is arranged at a height almost equal to that of step 4C. Further, inside the cab 5, a driver's seat 7 is provided as shown in FIG.

Numerals 8 and 9 are ladders for raising and lowering provided along the side surface of the building 4, and the ladders 8 and 9 are raised and lowered on the step 4C of the building 4 by the operator of the hydraulic excavator or the like. It is used when doing.

Reference numeral 11 denotes a load lifting device for lifting and lowering a load on the building 4 from the ground. The load lifting device 11 is, as shown in FIGS.
5, a hydraulic motor 16 and the like, which is located near the cab 5 and is provided on the step 4C of the building 4. Also,
As shown in FIGS. 6 and 7, the luggage lifting device 11 is provided with an operation lever 25, which will be described later, and a lifting switch 27.

12, 12 are a pair of support brackets 13,
A wire drum is rotatably provided on the step 4C of the building 4 by using the wire 13, and a wire 14 described below is wound around the outer periphery of each wire drum 12. In addition, rod-shaped wire guides 13A and 13B that guide the wire 14 slidably are provided on each support bracket 13 so as to project outward from the top of the building 4, and each roller 13C is attached to the wire guide 13A. Each guide cylinder 13D is attached to the wire guide 13B.

Reference numerals 14 and 14 denote a pair of wires provided on both the left and right sides of the lifting table 15. One end of each wire 14 is fixed to the building 4 side through a support bracket 13, and the other end thereof is a wire drum. It is wound around 12 so that it can be unwound. The middle portion of each wire 14 extends through the roller 13C of the wire guide 13A, the guide tube 13D of the wire guide 13B, and the roller 15A of the lifting table 15 to support the lifting table 15.

Reference numeral 15 is a lift table on which a load or the like for lifting is placed. Two rollers 15A, 15A, ... For winding each wire 14 are provided on the left and right sides of the lift table 15, respectively. There is. Further, a handrail 15B is provided on the outer periphery of the upper surface of the lifting table 15.
Is erected. The lift table 15 is driven upward and downward by the hydraulic motor 16 via the wire drum 12, the wire 14, etc., and the upper limit position shown by a virtual line in FIG. 4 and the lower limit shown by a virtual line in FIG. It is moved up and down between positions.

Reference numerals 16 and 16 denote a pair of hydraulic motors provided as driving means in the vicinity of the support brackets 13. The output sides of the hydraulic motors 16 are connected to the wire drum 12 via belts, chains, etc. Pump 17
It is rotated forward and backward by. When the hydraulic motor 16 rotates normally, the wires 14 are unwound from the wire drum 12 and the elevating table 15 descends. When the hydraulic motor 16 rotates reversely, the wires 14 are wound on the wire drum 12. As a result, the platform 15 is raised.

Next, referring to FIG. 7, a drive circuit for the load lifting device 11 will be described. Reference numeral 17 is a pilot pump which constitutes a hydraulic source together with the tank 18, and the pilot pump 17 is provided in a hydraulic excavator. The hydraulic actuators are connected to the pilot portion using a pilot line 19, and these hydraulic actuators are, for example, a traveling motor for traveling the lower traveling body 1, a traveling motor for rotating the upper traveling body 2, a boom of a working device, Each hydraulic cylinder (not shown) that drives an arm, a bucket, and the like is configured.

The pilot pump 17 applies a pilot pressure to the pilot portion of each hydraulic actuator through the pilot conduit 19 to operate each hydraulic actuator. A relief valve 20 is provided on the discharge side of the pilot pump 17 so as to be located between the pilot pump 17 and the tank 18.

Numerals 21 and 21 are a pair of lift table drive parts (one of them is not shown) provided in parallel in the middle of the pilot line 19 corresponding to each hydraulic motor 16, and each lift table drive part. 21 is the hydraulic motor 16 and the pilot conduit 19
It is composed of a switching valve 22 connected midway and a directional control valve 23 provided between the switching valve 22 and the hydraulic motor 16.

Here, the switching valve 22 is the electromagnetic pilot section 2
In the state of having 2A and in the stop position (a), the pressure oil (pilot pressure) discharged from the pilot pump 17 is supplied to each hydraulic actuator side, and is switched to the operating position (b) by the controller 30 described later. When I was asked,
This pressure oil is supplied to the hydraulic motor 16 side.

The directional control valve 23 has electromagnetic pilot portions 23A and 23B, and the controller 30 switches from the neutral position (a) to the switching position (b) and the switching position (c), whereby the pilot pump 17 The direction of the pressure oil supplied to and discharged from the hydraulic motor 16 is switched to rotate the hydraulic motor 16 forward and backward.

Reference numeral 24 is an operation valve composed of a directional control valve or the like, and the operation valve 24 is provided between the hydraulic actuators of the hydraulic excavator and the lift table drive unit 21 and is provided in the middle of the pilot conduit 19. The operation lever 25 is used to switch between the switching positions (a) and (b).

Reference numeral 25 is an operating lever for selectively actuating either one of the hydraulic actuators of the hydraulic excavator or the load lifting device 11, and the operating lever 25 is provided in the cab 5 as shown in FIGS. 6 and 7. It is provided so as to be tiltable between the driver's seat 7 and the doorway (not shown), and constitutes a turning restriction means together with the operation valve 24.

When the operation lever 25 is switched to the lift lock position (A), the operation valve 24 is switched to the switch position (a), the operation of the load lifting device 11 is held in the stopped state, and the pilot pump is operated. The pressure oil from 17 is supplied to each hydraulic actuator side.

In this case, the raising / lowering lock position (A) of the operating lever 25 is a blocking position for blocking between the driver's seat 7 and the doorway. The seated state is forcibly maintained.

When the operating lever 25 is switched to the raising / lowering operation position (B), the operating valve 24 is switched to the switching position (B), and at this time, the controller 3
0 switches the switching valve 22 to the operating position (b) using a detection signal output from a lever position sensor 26 described later.
As a result, the pressure oil from the pilot pump 17 is supplied to the hydraulic motor 16 side, and each hydraulic actuator is stopped.

In this case, since the raising / lowering position (B) of the operating lever 25 is the opening position for opening the driver's seat 7 and the doorway, the driver is allowed to leave the driver's seat 7. Then, it is possible to stand up and down outside the cab 5 and perform the lifting work of the luggage.

Reference numeral 26 is a lever position sensor attached to the operating lever 25. The lever position sensor 26 is, for example, a non-contact type limit switch as shown in FIG.
The switching position of the operation lever 25 is detected as one of the lift lock position (A) and the lift operation position (B), and a detection signal is output.

Reference numeral 27 is an elevating switch for variably setting the elevating direction and elevating speed of the elevating table 15.
As shown in FIG. 3, it is composed of, for example, a sliding knob having a variable resistor or the like, and is provided near the wire drum 12 and provided on the outer surface side of the cab 5.

The elevating switch 27 converts the change in resistance value into a voltage value by moving the sliding knob up and down from the intermediate position, and outputs the operation signal S having the voltage value VS to the controller 30. It is a thing. In this case, the magnitude of this voltage value VS is regulated by a predetermined maximum value Vmax (Vmax> 0) of the voltage, as shown in FIG. 8, within the range of Vmax ≧ VS ≧≧ Vmax It changes according to the amount of operation when moving from the middle position up and down.

28 is a limit switch on the upper limit side provided corresponding to the upper limit position of the lifting table 15. As shown in FIG. 4, the limit switch 28 is a non-contact type constituted by using a magnet or the like. The controller 3 is composed of a switch and the like, and detects whether or not the lift 15 is at the upper limit position.
The detection signal is output to 0.

Reference numeral 29 denotes a lower limit side limit switch provided corresponding to the lower limit position of the lifting table 15. The limit switch 29 is constructed in substantially the same manner as the limit switch 28. Then, the limit switch 29 detects whether or not the lifting platform 15 is at the lower limit position by detecting, for example, a magnet (not shown) embedded in the middle position of the wire 14, and sends a detection signal to the controller 30. It is what is output.

Reference numeral 30 is a controller as a control means for controlling the load lifting device 11, and a lever position sensor 26, a lifting switch 27, limit switches 28, 29, etc. are provided on the input side of the controller 30, as shown in FIG. It is connected. Further, the output side of the controller 30 is connected with an electromagnetic pilot portion 22A of the switching valve 22, electromagnetic pilot portions 23A and 23B of the directional control valve 23, an alarm device 31 described later, and the like.

Then, the controller 30 detects the switching position of the operating lever 25 using the detection signal from the lever position sensor 26, and the operating lever 25 moves up and down (B).
In the case of, the elevating table 15 is driven in the elevating direction and the elevating speed according to the setting contents of the elevating switch 27. In this case, the direction and speed of the elevator 15 are controlled by using the voltage value VS of the operation signal S output from the elevator switch 27 and the predetermined minute determination value α, as shown in FIG. It

Further, the controller 30 has the operation lever 2
When 5 is switched to the lift lock position (A), the load lifting device 11 is stopped after the lift table 15 is raised to the upper limit position using the detection signal from the limit switch 28.

31 is an alarm device provided in the cab 5,
The alarm device 31 is composed of, for example, an alarm lamp, an alarm sound generator, and the like, and issues an alarm to the driver by a command signal from the controller 30 when the lift 15 is descending from the upper limit position.

The hydraulic excavator according to this embodiment has the above-mentioned structure. Next, the control processing by the controller 30 will be described with reference to FIG.

First, for example, when carrying out lifting / lowering work of a load while operating a hydraulic excavator, if the driver tilts the operating lever 25 in the cab 5 from the lifting / lowering lock position (A) to the lifting / lowering operation position (B). The operation valve 24 is switched to the switching position (B). At this time, the operation lever 25
Is an opening position that opens between the doorway of the cab 5 and the driver's seat 7, and allows the driver to leave the driver's seat 7 and stand out of the cab 5.

Then, in step 1, it is determined whether or not the switching position of the operating lever 25 is at the raising / lowering operation position (B) using the detection signal from the lever position sensor 26, and in this case, "YES" is determined. Since it is determined, in step 2,
The switching valve 22 is switched from the stop position (a) to the operating position (b).

As a result, the pressure oil from the pilot pump 17 is stopped from being supplied to each actuator of the hydraulic excavator, and the hydraulic excavator is in a state in which the traveling operation, the turning operation, the driving of the working device, etc. are restricted. The pressure oil is supplied to the hydraulic motor 16 side. Then, the driver descends from the cab 5 onto the building 4, and the luggage lifting device 11
The elevating switch 27 is operated in the vicinity of.

Next, in step 3, the elevating switch 27
It is determined whether or not the voltage value VS of the operation signal S output from the control signal S is within the range of α ≧ VS ≧ −α determined by the determination value α in FIG. Since the manipulated variable of 27 is almost equal to zero, step 4
The directional control valve 23 is maintained at the neutral position (a) to maintain the stopped state of the hydraulic motor 16, and the process returns to step 1.

When it is judged "NO" in step 3, it is judged in step 5 whether the voltage value VS of the operation signal S is larger than the judgment value α. And step 5
When it is determined to be "NO", the voltage value VS becomes smaller than -α (VS <-α) and the elevating switch 27 is operated in the descending direction of the elevating table 15, so that the limit switch 29 is operated in step 6. Lifting platform 1 using the detection signal of
It is determined whether or not 5 is at the lower limit position.

When it is determined to be "NO" in step 6, since the lifting platform 15 is located at a position higher than the lower limit position, the directional control valve 23 is switched to the switching position (b) in step 7 to turn on the hydraulic motor 16. It is rotated in the forward direction and the elevating table 15 is lowered. Then, in step 8, in order to inform the driver that the lifting platform 15 is located at a position lower than the upper limit position, the alarm device 31 is activated and the process returns to step 1.

If "YES" is determined in step 6, the lift table 15 cannot be lowered from the lower limit position, so that the step 8 is executed without rotating the hydraulic motor 16 in the forward direction and the process proceeds to step 1. Return.

On the other hand, if "YES" is determined in step 5, since the lifting switch 27 is operated in the lifting direction of the lifting table 15, the lifting table 27 is operated in step 9 by using the detection signal from the limit switch 28. It is determined whether or not 15 is at the upper limit position. Then, in step 9, "N
When it is determined to be “O”, the lift table 15 is located at a position lower than the upper limit position, so in step 10, the directional control valve 23 is switched to the switching position (C), the hydraulic motor 16 is rotated in the reverse direction, and the lift table 15 is raised. After that, the process returns to step 1.

When it is determined to be "YES" in step 9, it is not possible to raise the lift table 15 above the upper limit position, so that the alarm 31 is stopped in step 11 without rotating the hydraulic motor 16 in the reverse direction. And then return to step 1.

As a result, unless the driver operates the operating lever 25 to switch the raising / lowering operation position (B) to the raising / lowering lock position (A), the processes of steps 1 to 11 are repeated, so that the driver By operating the lift switch 27, the hydraulic motor 16 can be stopped and rotated in the forward or reverse direction according to the voltage value VS of the operation signal S.
Can be freely moved up and down between the upper limit position and the lower limit position.

At this time, the flow rate of the pressure oil supplied to and discharged from the hydraulic motor 16 through the directional control valve 23 is changed according to the voltage value VS of the operation signal S, and the ascending / descending speed of the ascent / descent table 15 is operated by the ascending / descending switch 27. It can be adjusted according to the quantity.

On the other hand, when the driver finishes the lifting and lowering work of the luggage, the driver returns to the inside of the cab 5 and operates the operation lever 25.
When the control valve 24 is switched from the lifting operation position (B) to the lifting lock position (A), the operation valve 24 is switched to the switching position (a). Further, at this time, the operation lever 25 shuts off between the doorway of the cab 5 and the driver's seat 7, and becomes a shut-off position for forcibly holding the state in which the driver is seated on the driver's seat 7.

In this case, since "NO" is determined in step 1, it is determined in step 12 whether the lift 15 is at the upper limit position. When it is determined to be “NO” in step 12, the hydraulic motor 16 is reversely rotated in step 13 to forcibly raise the lift table 15,
This lifting operation is continued until the lifting platform 15 reaches the upper limit position.

When it is determined to be "YES" in step 12, since the elevator 15 is returned to the upper limit position, the alarm device 31 is stopped in step 14 and the switching valve 22 is stopped in the stop position (a). After switching to, return to the start.

As a result, the pressure oil from the pilot pump 17 is stopped from being supplied to the hydraulic motor 16 and supplied again to each actuator of the hydraulic excavator, so that the hydraulic excavator can resume the civil engineering work and the like. it can.

Thus, in the present embodiment, since the load lifting device 11 is provided on the building 4 of the hydraulic excavator, when the driver climbs on the building 4 using the ladders 8 and 9, tools and life are used. There is no need to carry luggage such as supplies, and even after the driver once climbs onto the building 4, he / she can easily lift the luggage from the ground onto the building 4 by using the luggage lifting device 11 without getting off to the ground side. be able to. Therefore,
In particular, in a large hydraulic excavator or the like in which the cab 5 is located at a high position from the ground, the lifting work of luggage and the like can be efficiently and safely performed.

In this case, since the luggage lifting device 11 is located near the cab 5 on the step 4C of the building 4 and the lifting switch 27 is provided on the outer surface side of the cab 5, for example, when the hydraulic excavator is in operation When performing the lifting work of
In the cab 5, the driver switches the operation lever 25 to the ascending / descending position (B), and the cab 5 moves to step 4 of the building 4.
It is possible to stand on C and easily approach the vicinity of the lift 15.

In this elevating work, the driver can operate the elevating switch 27 while confirming the elevating operation of the elevating table 15 in the vicinity of the elevating table 15, and, for example, after lowering the elevating table 15 to the ground side. In addition, it is possible to place a load on the lift table 15 by asking a worker on the ground side to raise the lift table 15 to the upper limit position, and thereby to perform the lifting and lowering work of the load smoothly. it can.

Further, by using the lifting switch 27, the lifting table 1
Since the ascending / descending direction and the ascending / descending speed of 5 are variably set, not only the ascending / descending direction of the ascending / descending table 15 but also the ascending / descending speed can be easily adjusted according to the contents of the ascending / descending work, the type of luggage, and the like. It is possible to improve workability and stability during lifting operation.

In addition, the load lifting device 11 includes a switching valve 2
2. Since the operation valve 24, the operation lever 25 and the like are provided, when the lifting work of the load is started while the hydraulic excavator is in operation, the operation lever 25 is simply switched to the lifting operation position (B) and the load lifting device is operated. 11 can be set to an operable state, and at this time, the pressure oil supplied from the pilot pump 17 to each actuator of the hydraulic excavator is stopped to reliably regulate the traveling operation, turning operation, driving of the working device, etc. of the hydraulic excavator. be able to.

As a result, even when another worker or the like climbs up on the building 4 to lift or lower the luggage together with the driver, the hydraulic excavator accidentally travels by the driver during the lifting or lowering of the luggage by the worker, It is possible to prevent the vehicle from being swung, protect the luggage lifting device 11 and enhance the safety of lifting work.

When the lifting and lowering work of the luggage is completed, the operating lever 25 is simply switched to the lifting and lowering lock position (A) and the lifting and lowering table 15 is moved to the upper limit position (initial state) without operating the lifting and lowering switch 27. The load lifting device 11 can be held in a stopped state after that, as well as the work of clearing the lifting table 15 can be easily performed. As a result, the driver
It is possible to reliably prevent the hydraulic excavator from starting running, turning, and the like while the vehicle is being lowered, and it is possible to smoothly resume civil engineering work and the like by the hydraulic excavator.

Moreover, the operating lever 25 is provided between the entrance of the cab 5 and the driver's seat 7, and its up / down lock position (A).
Is a shut-off position that shuts off the two, and the lift operation position (B) is an open position that opens the two. Therefore, when the operating lever 25 is switched to the lift lock position (A), Although the hydraulic actuator is in an operable state, it is possible to restrict the driver from leaving the driver's seat 7 and improve the safety during civil engineering work. Further, when the operation lever 25 is switched to the lifting operation position (B), the luggage lifting device 11 can be set in an operable state, and the driver can stand up outside the cab 5. Can perform lifting work of luggage on the building 4.

Further, since both the left and right sides of the lifting table 15 are supported by the wires 14 via the rollers 15A, the lifting table 15 is stabilized by the hydraulic motor 16 via the wire drum 12 and the wires 14. Can be raised and lowered as desired.

In the embodiment, steps 12 and 13 in FIG. 8 show a concrete example of the lock raising means.

Further, in the embodiment, the hydraulic motor 16 is used as the drive means for the lifting table 15, but the present invention is not limited to this, and the lifting table 15 may be driven by, for example, an electric motor. Good.

Further, in the embodiments, a large hydraulic excavator was described as an example of the construction machine, but the present invention is not limited to this, and may be applied to other construction machines such as hydraulic cranes.

[0084]

As described in detail above, according to the invention of claim 1, since the luggage lifting device is provided on the building of the upper swing body, when the driver climbs onto the building using a ladder or the like. It is no longer necessary to carry luggage such as tools, daily necessities, etc., and even after the driver once climbs onto the building, he / she can easily lift the luggage from the ground onto the building without using the luggage lifting device. Can be made. Therefore, especially in a large-sized construction machine or the like in which the operator's cab provided on the building is located at a high position above the ground, it is possible to efficiently and safely perform lifting and lowering work of luggage and the like.

Further, according to the second aspect of the invention, since the load lifting device is provided with the turning restricting means, only by switching the turning restricting means to the raising / lowering operation position, the upper revolving structure is operated during the lifting work of the load. Can be prevented from accidentally performing a turning operation or the like, and the luggage lifting device can be protected to enhance the safety of lifting work. Also, at the end of the lifting work, by simply switching the turning restriction means to the lifting lock position, it is possible to smoothly restart the civil engineering work by the construction machine, etc., and make sure that the driver does not accidentally operate the luggage lifting device during this work. Can be prevented.

Further, according to the invention of claim 3, since the lifting means for lock is provided in the luggage lifting device,
At the end of the lifting work, it is possible to surely return the lift base to the upper limit position by simply switching the turning restricting means to the lift lock position, and it is possible to easily carry out the work of clearing the lift base and to allow the driver to move up and down. It is possible to prevent the operation of the construction machine from being started with the platform lowered.

Further, according to the invention of claim 4, since the lifting / lowering device is provided with the lifting / lowering switch, not only the lifting / lowering direction of the lifting / lowering table but also the lifting / lowering direction according to the contents of lifting / lowering work, kind of cargo, etc. The speed can be easily adjusted, and the workability of the lifting work and the stability during the lifting motion can be improved.

Further, according to the invention of claim 5, since the upper revolving structure is provided with the cab and the step and the load lifting device is arranged on the step, for example, lifting and lowering of the load while the construction machine is operating. When performing work, the driver can easily get up from the cab on the steps of the building and approach the vicinity of the elevator, and at this position, the operator can smoothly raise and lower the elevator while checking the operation of the elevator. it can.

Further, according to the invention of claim 6, since the wires provided on both the left and right sides of the lifting table are wound by the driving means via the wire drum and supported so as to be able to be unwound, the driving means is provided. With this, the elevating table can be stably moved up and down via the wire drum, the wire, and the like.

Further, according to the invention of claim 7, the operation lever is provided in the cab between the doorway and the driver's seat for switching the turning restriction means. When switching to the shutoff position, it is possible to prevent the driver from leaving the driver's seat and standing out of the cab, despite the upper revolving structure being in a state of being revolvable, thereby improving safety during civil engineering work. Can be improved. Also, when the operating lever is switched to the open position, the load lifting device can be set to the operable state and the driver can stand up on the cab 5, so that the driver can lift the load on the building. You can do the work.

[Brief description of drawings]

FIG. 1 is a front view showing a large hydraulic excavator applied to an embodiment of the present invention.

FIG. 2 is a left side view of FIG. 1 showing a lower traveling structure and an upper revolving structure of the hydraulic excavator.

FIG. 3 is a front view of the luggage lifting device showing an enlarged main part in FIG. 1.

FIG. 4 is a left side view of the luggage lifting device showing an enlarged main part in FIG.

FIG. 5 is an enlarged view of a main part in FIG. 2, showing a state in which a lift is raised and lowered.

FIG. 6 is an enlarged view of the inside of a driver's cab showing an operation lever and the like.

FIG. 7 is a configuration diagram showing a drive circuit of the luggage lifting device.

FIG. 8 is a characteristic diagram showing a relationship between an ascending / descending direction and an ascending / descending speed of an elevator and an operation signal.

FIG. 9 is a flowchart showing control processing by the controller.

[Explanation of symbols]

1 Undercarriage 2 Upper revolving structure 4 buildings 4C steps 5 cabs 7 driver's seat 11 Luggage lifting device 12 wire drum 14 wires 15 Lifting platform 15A roller 16 Hydraulic motor (drive means) 24 Control valve (turn control means) 25 Control lever (turn control means) 27 Lift switch

Claims (7)

[Claims] 1. An undercarriage, an upper revolving structure which is rotatably provided on the lower traveling structure and accommodates a power source in a building, and a work device provided on the upper revolving structure. In the construction machine, a luggage lifting device for lifting and lowering luggage from the ground is provided on the building of the upper swing body, and the luggage lifting device includes a wire drum rotatably provided in the building and the wire. An elevator that is connected to a wire that is wound around a drum and that is vertically movable to and from the ground, and a drive that rotates the wire drum to raise and lower the elevator through the wire. A construction machine characterized by comprising means and means. 2. The luggage lifting device regulates the swinging motion of the upper swing body when the lifting lock position for locking the lifting motion of the lifting platform is switched to the lifting motion position for lifting the lifting platform. The construction machine according to claim 1, further comprising turning control means for controlling the turning. 3. The load lifting device is provided with lock-time lifting means for forcibly lifting the lifting platform to a predetermined upper limit position when the turning restriction means is switched to the lifting lock position. The construction machine according to claim 2, wherein 4. The lifting / lowering device is provided with a lifting / lowering switch for variably setting a lifting / lowering direction and a lifting / lowering speed when the lifting / lowering platform is lifted and lowered.
Construction machine described in. 5. The upper revolving structure is provided with a cab located at a front corner of the building and a step located near the cab and fixed to the building, and the luggage lifting device is provided with the Claim 1, which is arranged on the steps of the building.
The construction machine according to 2, 3, or 4. 6. The wires are provided on both the left and right sides of the lifting table, one end of each wire is fixed to the building side of the upper revolving structure, and an intermediate portion is a roller provided on the lifting table. 6. The lifting table is supported via the other end, and the other end side is supported by the driving means so as to be able to be wound and unwound via a wire drum.
Construction machine described in. 7. The upper revolving structure is provided with a cab having a driver's seat inside, and an operating lever is provided in the cab, the operating lever being located between the driver's seat and the doorway for switching the turning restriction means. , The operating lever switches the turning restricting means to an up-and-down lock position when tilted to a shut-off position that shuts off between the driver's seat and the doorway, and opens the door between the driver's seat and the doorway. The construction machine according to claim 2, wherein the turning restriction means is switched to an up-and-down operation position when tilted to a position.