CN104047912A - Digital pump control differential motion hydraulic cylinder with power source - Google Patents
Digital pump control differential motion hydraulic cylinder with power source Download PDFInfo
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- CN104047912A CN104047912A CN201410293460.8A CN201410293460A CN104047912A CN 104047912 A CN104047912 A CN 104047912A CN 201410293460 A CN201410293460 A CN 201410293460A CN 104047912 A CN104047912 A CN 104047912A
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Abstract
The invention discloses a digital pump control differential motion hydraulic cylinder with a power source. The digital pump control differential motion hydraulic cylinder with the power source comprises a hydraulic actuating part hydraulic cylinder body and the hydraulic power part power source, wherein the power source is of the structure that an oil inlet and outlet of a rod cavity of the dual-action differential motion hydraulic cylinder body is communicated with an oil inlet and outlet of a rodless cavity of the dual-action differential motion hydraulic cylinder body through a fluid pipe which is sequentially connected with a first hydraulic control check valve, a hydraulic motor in two-way shunt hydraulic motors and a two-way quantitative hydraulic pump and a second hydraulic control check valve, a hydraulic opening of the other hydraulic motor in the two-way shunt hydraulic motors is communicated with a fluid pipeline between one hydraulic motor in the two-way shunt hydraulic motors and the two-way quantitative hydraulic pump, the other hydraulic opening of the other hydraulic motor in the two-way shunt hydraulic motors is communicated with an oil tank through a connecting pipeline, and a pump shaft of the two-way quantitative hydraulic pump is connected with a motor shaft of a motor. Due to the adoption of the digital pump control differential motion hydraulic cylinder with the power source, leakage is avoided, the structure is compact, and throttling loss is avoided.
Description
Technical field
The present invention relates to differential hydro cylinder, the invention particularly relates to a kind of pump control type hydraulic power unit of integrated self-powered source, belong to electrohydraulic control technology field and machinery manufacturing technology field.
Background technique
Electrohydraulic control system has volume to control and two large classes are controlled in throttling.Throttling is controlled electrohydraulic system and is mostly adopted selector valve, not only cannot bear long-term high speed commutation requirement, and restriction loss causes that system heating is excessive, causes energy dissipation.New developing direction is directly to control oil hydraulic cylinder with oil hydraulic pump.In hydraulics, the final controlling element of extensive use is the differential hydro cylinder of singly lifting one's head.Differential hydro cylinder due to the area of rod chamber and rodless cavity not etc., continue to use like this as still the circuit theory of controlling uniform section cylinder, system just cannot normally be worked, and makes the how difference in flow of balanced differential oil hydraulic cylinder become an important problem.
Patent " 200510020094.X " discloses a kind of controlled by electro-hydraulic proportional pump asymmetrical cylinder closed-loop speed system, by flow shunt relief valve and feed circuit, realizes the difference in flow of differential hydro cylinder.Patent " 200810007666.4 " discloses a kind of pump control type electrohydraulic actuator, goes the difference in flow of balanced differential oil hydraulic cylinder by the mode of relief valve throttling.Patent " 201310241735.9 " discloses the oil hydraulic cylinder of a kind of directly driving type servo-pump control electricity liquid combination drive and has controlled system and controlling method, balances the difference in flow that singly goes out hair style oil cylinder by differential unloading valve.Above three inventions have all adopted relief valve balanced flow poor, and in use relief valve is in normally open, so restriction loss is larger, and system capacity efficiency is low and cause system heating, and is not suitable for high-frequency condition of commutation.Patent " 200610012476.2 " discloses a kind of closed electrohydraulic controlling system, adopts the oil hydraulic pump of 3 hydraulic fluid ports to realize and is connected with differential hydro cylinder, the difference in flow of the thrust plate balanced differential oil hydraulic cylinder by oil hydraulic pump.This invention has well solved restriction loss problem, but all needs to redesign the thrust plate of oil hydraulic pump for the poor differential hydro cylinder of different area, this more complicated all in practical application and structural design; In addition need to be equipped with separately corresponding hydraulic power.Patent " 201310215195.7 " discloses a kind of hydraulic actuator, and oil sources is built-in, does not need the auxiliary of external equipment, is a kind of integrated product.But the differential hydro cylinder rodless cavity in this invention is connected with fuel tank all the time, and hydraulic system can only be controlled flow and the pressure of rod chamber, hydraulic actuator only has ability bidirectional-movement under the effect of pulling force externally, so service condition has sizable narrow limitation.
Summary of the invention
The object of the invention is to overcome the deficiency of prior art, provide a kind of oil circuit simply, can not leak, compact structure, without the digital pump controlled hydraulic differential cylinder in the long and energy-conservation self-powered source of restriction loss, life-span.
In order to achieve the above object, the technical solution used in the present invention is:
The digital pump controlled hydraulic differential cylinder in self-powered source of the present invention, it comprises hydraulic pressure power unit oil hydraulic cylinder and hydraulic power parts power source, the various piece of power source is all placed in containment vessel, described containment vessel is arranged on oil hydraulic cylinder by fixing device, and described oil hydraulic cylinder comprises a double-action differential hydro cylinder and inserts the built-in sensors of double-action differential hydro cylinder rodless cavity; the structure of described power source is: the oil inlet and outlet of the rod chamber of double-action differential hydro cylinder is by being connected with the first Pilot operated check valve in turn, an oil hydraulic motor in bidirectional shunt oil hydraulic motor, the fluid pipe-line of two-way quantitative oil hydraulic pump and the second Pilot operated check valve is connected with the filler opening that goes out of the rodless cavity of double-action differential hydro cylinder, hydraulic port of another oil hydraulic motor in bidirectional shunt oil hydraulic motor is with oil hydraulic motor in bidirectional shunt oil hydraulic motor and the fluid pipe-line between two-way quantitative oil hydraulic pump is communicated with and another hydraulic port of another oil hydraulic motor is communicated with fuel tank by connecting line, the described pump shaft of two-way quantitative oil hydraulic pump and the motor shaft of motor are connected, described motor is connected with power system controller, described bidirectional shunt oil hydraulic motor is mechanically connected to together by coupling by two oil hydraulic motors, described first, two Pilot operated check valves form hydraulic lock, two pumping holes of the rod chamber of double-action differential hydro cylinder and rodless cavity and two-way quantitative oil hydraulic pump are communicated with fuel tank by a pipeline that is connected with safety valve separately, described sensor is connected with power system controller by guide line, described sensor is to controller output displacement signal or rate signal, described power system controller compares the feedback signal of sensor and given signal, then export control signal operation with control motor to motor.
The invention has the beneficial effects as follows: the digital pump controlled hydraulic differential cylinder in self-powered source of the present invention, its self-powered source, not only customer service hydraulic power unit need external oil sources, oil circuit to lay complicated shortcoming; And integrated embedded control system, saved the external equipment of electrical control, as long as the also input instruction signal of connecting with the mains can normally be used.
The present invention is sealed in fluid by fuel tank the inside of power source, has reduced the leakage phenomenon of hydraulic system, has reduced the impact of outer bound pair hydraulic oil.
The present invention, by the volume shunting action of the bidirectional shunt oil hydraulic motor in hydraulic valve bank, has solved the compensation control problem for the double-action differential hydro cylinder two asymmetric flows in chamber well; Therefore safety valve can not be worked when system is normally worked, and only in system overload, just can open, and has solved well restriction loss problem, and safety valve structurally all adopts plug-in type, has reduced better the volume of power source; System does not adopt solenoid directional control valve, makes system architecture compact, and weight saving, has also reduced the restriction loss of system.
The present invention controls the commutation of hydraulic power unit by driven by motor two-way quantitative oil hydraulic pump, the form of this pump control cylinder can be born long-term commutation requirement, long service life; The system causing than the valve-controlled cylinder restriction loss excessive phenomenon of generating heat, pump control cylinder can significantly be saved energy, meets the thinking of development of green low-energy consumption.
Accompanying drawing explanation
Fig. 1 is the digital pump controlled hydraulic differential cylinder schematic diagram in self-powered source of the present invention;
Fig. 2 is the digital pump controlled hydraulic differential cylinder structural representation in self-powered source of the present invention.
Embodiment
The digital pump controlled hydraulic differential cylinder in self-powered source of the present invention as shown in drawings, it comprises hydraulic pressure power unit oil hydraulic cylinder and hydraulic power parts power source, the various piece of power source is all placed in containment vessel, described containment vessel is arranged on oil hydraulic cylinder by fixing device, and described oil hydraulic cylinder comprises a double-action differential hydro cylinder 1 and inserts the built-in sensors 9 of double-action differential hydro cylinder 1 rodless cavity; the structure of described power source is: the oil inlet and outlet of the rod chamber of double-action differential hydro cylinder 1 is by being connected with the first Pilot operated check valve in turn, an oil hydraulic motor in bidirectional shunt oil hydraulic motor 5, the fluid pipe-line of two-way quantitative oil hydraulic pump 6 and the second Pilot operated check valve is connected with the filler opening that goes out of the rodless cavity of double-action differential hydro cylinder 1, hydraulic port of another oil hydraulic motor in bidirectional shunt oil hydraulic motor 5 is with oil hydraulic motor in bidirectional shunt oil hydraulic motor 5 and the fluid pipe-line between two-way quantitative oil hydraulic pump 6 is communicated with and another hydraulic port of another oil hydraulic motor is communicated with fuel tank by connecting line, the described pump shaft of two-way quantitative oil hydraulic pump 6 and the motor shaft of motor are connected, described motor is connected with power system controller, described bidirectional shunt oil hydraulic motor 5 is mechanically connected to together by coupling by two oil hydraulic motors, described first, two Pilot operated check valves form hydraulic lock, two pumping holes of the rod chamber of double-action differential hydro cylinder 1 and rodless cavity and two-way quantitative oil hydraulic pump 6 are communicated with fuel tank by a pipeline that is connected with safety valve separately, described sensor is connected with power system controller 11 by guide line, described sensor is to controller output displacement signal or rate signal, described power system controller compares the feedback signal of sensor and given signal, then export control signal operation with control motor to motor.
Described sensor is displacement transducer or velocity transducer.
The first Pilot operated check valve 3.1 in this device, the second Pilot operated check valve 3.2, bidirectional shunt oil hydraulic motor 5, first, second, third and fourth safety valve 4.1,4.2,4.3,4.4 have formed hydraulic valve bank 12.Described bidirectional shunt oil hydraulic motor 5 is mechanically connected to together by coupling by two oil hydraulic motors, plays the effect of volume shunting, and described oil hydraulic motor can be gear type or the less oil hydraulic motor of plunger type equal-volume.First, second, third and fourth described safety valve 4.1,4.2,4.3,4.4 preferably all adopts plug-in type.Described motor 7 is generally actuating motor or stepper motor, is provided with power system controller support on motor 7, and power system controller 11 is arranged on power system controller support.Described power system controller 11 markets are on sale, and what generally use is ARM chip, and the composition of controller is all also generally common version.Control procedure is: controller is connected into a closed loop control system by whole device, described sensor is connected with power system controller by guide line, by sensor, pass the signal in real time controller, controller compares the feedback signal of sensor and given signal, control again the operation of motor, thereby oil hydraulic cylinder is carried out to positioning control or speed control.
The digital pump controlled hydraulic differential cylinder in self-powered source of the present invention in use, is divided into two kinds of working conditions: piston rod stretches out with piston rod retracts.The sense of rotation of supposing motor 7 when piston rod stretches out is forward.In the process of the normal work of system, first, second, third and fourth safety valve 4.1,4.2,4.3,4.4 does not participate in work, when only having overload, system is played a protective role.Wherein, first and second safety valve 4.1 and 4.4 shields when working or overload to the rod chamber of differential hydro cylinder 1 and rodless cavity respectively, and the pump intake pressure of third and fourth safety valve 4.2 and 4.3 pairs of two-way quantitative oil hydraulic pumps 6 shields.
When control piston bar stretches out, extraneous pulse signal is controlled motor 7 forwards, drive two-way quantitative oil hydraulic pump 6 to rotate, now the remote control mouth pressure of the first Pilot operated check valve 3.1 raises, the first Pilot operated check valve 3.1 is opened, hydraulic oil flows into the rodless cavity of differential hydro cylinder 1 from the rod chamber of differential hydro cylinder 1 through pipeline 2, the first Pilot operated check valve 3.1, bidirectional shunt oil hydraulic motor 5, two-way quantitative oil hydraulic pump 6, second Pilot operated check valve 3.2 of fluid pipe-line, piston rod stretches out.Because the hydraulic oil flowing out from rod chamber is less than the hydraulic oil that flow into rodless cavity, so bidirectional shunt oil hydraulic motor 5 can make up a deficiency and enter rodless cavity from fuel tank 8, realizes flow-compensated.
When control piston bar is retracted, extraneous pulse signal is controlled motor 7 reversions, drive two-way quantitative oil hydraulic pump 6 to rotate, now the remote control mouth pressure of the second Pilot operated check valve 3.2 raises, the second Pilot operated check valve 3.2 is opened, hydraulic oil flows into the rod chamber of differential hydro cylinder 1 from the rodless cavity of differential hydro cylinder 1 through pipeline 10, the second Pilot operated check valve 3.2, two-way quantitative oil hydraulic pump 6, bidirectional shunt oil hydraulic motor 5, first Pilot operated check valve 3.1 of fluid pipe-line, piston rod is retracted.Because the hydraulic oil flowing out from rodless cavity is greater than the hydraulic oil that flow into rod chamber, so bidirectional shunt oil hydraulic motor 5 can, by unnecessary hydraulic oil row oil-feed tank 8, be realized flow-compensated.
When piston rod movement is after certain position, can make motor 7 stalls, first, second Pilot operated check valve 3.1 and 3.2 forms hydraulic lock, and therefore the digital pump controlled hydraulic differential cylinder in self-powered source of the present invention can be realized good positioning supports function.The digital pump controlled hydraulic differential cylinder in self-powered source of the present invention in using engineering, all the time by sensor to power system controller 11 transmitted signals, form closed loop control.
When outer load is the very large pressure acting on piston rod; the rodless cavity pressure of differential hydro cylinder is very high; the resulting maximum pump intake pressure of driven by motor oil hydraulic pump forward is still less than the pressure of rodless cavity; the second Pilot operated check valve 3.2 cannot be opened; now the 3rd safety valve 4.3 will be opened for oil hydraulic pump overflow, thereby oil hydraulic pump and motor is played to the effect of overload protection.If outer load surpasses a certain limiting value, the rodless cavity of differential hydro cylinder will have the danger of explosion, and the 4th safety valve 4.4 will be opened for the rodless cavity pressure release of differential hydro cylinder, thereby oil hydraulic cylinder is played to the effect of overload protection.
When outer load is the very large pulling force acting on piston rod; the rod chamber pressure of differential hydro cylinder is very high; the resulting maximum pump intake pressure of driven by motor oil hydraulic pump reversion is still less than the pressure of rod chamber; the first Pilot operated check valve 3.1 cannot be opened; now the second safety valve 4.2 will be opened for oil hydraulic pump overflow, thereby oil hydraulic pump and motor is played to the effect of overload protection.If outer load surpasses a certain limiting value, the rod chamber of differential hydro cylinder will have the danger of explosion, and the first safety valve 4.1 will be opened for the rod chamber pressure release of differential hydro cylinder, thereby oil hydraulic cylinder is played to the effect of overload protection.
Claims (5)
1. the digital pump controlled hydraulic differential cylinder in self-powered source, it comprises hydraulic pressure power unit oil hydraulic cylinder and hydraulic power parts power source, it is characterized in that: the various piece of power source is all placed in containment vessel, described containment vessel is arranged on oil hydraulic cylinder by fixing device, and described oil hydraulic cylinder comprises a double-action differential hydro cylinder and inserts the built-in sensors of double-action differential hydro cylinder rodless cavity; the structure of described power source is: the oil inlet and outlet of the rod chamber of double-action differential hydro cylinder is by being connected with the first Pilot operated check valve in turn, an oil hydraulic motor in bidirectional shunt oil hydraulic motor, the fluid pipe-line of two-way quantitative oil hydraulic pump and the second Pilot operated check valve is connected with the filler opening that goes out of the rodless cavity of double-action differential hydro cylinder, hydraulic port of another oil hydraulic motor in bidirectional shunt oil hydraulic motor is with oil hydraulic motor in bidirectional shunt oil hydraulic motor and the fluid pipe-line between two-way quantitative oil hydraulic pump is communicated with and another hydraulic port of another oil hydraulic motor is communicated with fuel tank by connecting line, the described pump shaft of two-way quantitative oil hydraulic pump and the motor shaft of motor are connected, described motor is connected with power system controller, described bidirectional shunt oil hydraulic motor is mechanically connected to together by coupling by two oil hydraulic motors, described first, two Pilot operated check valves form hydraulic lock, two pumping holes of the rod chamber of double-action differential hydro cylinder and rodless cavity and two-way quantitative oil hydraulic pump are communicated with fuel tank by a pipeline that is connected with safety valve separately, described sensor is connected with power system controller by guide line, described sensor is to controller output displacement signal or rate signal, described power system controller compares the feedback signal of sensor and given signal, then export control signal operation with control motor to motor.
2. swing hydraulic pressure cylinder drive-type clamping hand according to claim 1 is grabbed, and it is characterized in that: first, second, third and fourth described safety valve all adopts plug-in type.
3. the digital pump controlled hydraulic differential cylinder in self-powered source according to claim 1 and 2, is characterized in that: described sensor is displacement transducer or velocity transducer.
4. the digital pump controlled hydraulic differential cylinder in self-powered source according to claim 3, is characterized in that: described oil hydraulic motor is gear-type hydraulic motor or plunger hydraulic motor.
5. the digital pump controlled hydraulic differential cylinder in self-powered source according to claim 4, is characterized in that: described motor is actuating motor or stepper motor.
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| CN201410293460.8A CN104047912B (en) | 2014-06-25 | 2014-06-25 | The digital pump controlled hydraulic differential cylinder in self-powered source |
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| CN201410293460.8A CN104047912B (en) | 2014-06-25 | 2014-06-25 | The digital pump controlled hydraulic differential cylinder in self-powered source |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105003481A (en) * | 2015-07-01 | 2015-10-28 | 天津大学 | Integrated variable-damping hydraulic support system |
| CN105485077A (en) * | 2014-09-19 | 2016-04-13 | 鞍钢股份有限公司 | Hydraulic speed regulation loop system and method for axial plunger variable displacement motor |
| CN106224320A (en) * | 2016-09-12 | 2016-12-14 | 天津大学 | Inbuilt displacement sensor integrated form list rod symmetrical hydraulic cylinder |
| CN108691840A (en) * | 2017-03-31 | 2018-10-23 | 住友重机械工业株式会社 | Position control, fluid pressure drive device |
| CN108916139A (en) * | 2018-06-15 | 2018-11-30 | 沪东中华造船(集团)有限公司 | A kind of fluid pressure type moulding bed support system and its application method |
| CN110259770A (en) * | 2019-06-03 | 2019-09-20 | 长沙中联重科环境产业有限公司 | Compression type garbage truck pressure fills out system and noise control method |
| CN112088058A (en) * | 2018-05-07 | 2020-12-15 | 普锐特冶金技术德国有限公司 | Lifting device for metallurgical ladles and treatment device for liquid metal |
| CN113550942A (en) * | 2021-07-15 | 2021-10-26 | 南通睿基自动化技术有限公司 | Electrohydraulic control hydraulic vibration cylinder of servo pump |
| CN114508520A (en) * | 2020-11-16 | 2022-05-17 | 中国石油化工股份有限公司 | Director hydraulic integrated system for coiled tubing |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04290604A (en) * | 1991-03-18 | 1992-10-15 | Hitachi Ltd | Fluid pressure servo system |
| CN1800654A (en) * | 2005-12-20 | 2006-07-12 | 武汉科技大学 | Asymmetric cylinder closed-loop speed system controlled by electro-hydraulic proportional pump |
| CN1818382A (en) * | 2006-03-07 | 2006-08-16 | 太原理工大学 | Closed electrohydraulic controlling system |
| CN201166021Y (en) * | 2008-03-05 | 2008-12-17 | 陈岩 | Pump control type electrohydraulic actuator |
| US8453441B2 (en) * | 2008-11-06 | 2013-06-04 | Purdue Research Foundation | System and method for pump-controlled cylinder cushioning |
| CN103307060A (en) * | 2013-06-18 | 2013-09-18 | 南京埃尔法电液技术有限公司 | Direct drive type servo pump control electro-hydraulic combined driving hydraulic cylinder control system and control method |
-
2014
- 2014-06-25 CN CN201410293460.8A patent/CN104047912B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04290604A (en) * | 1991-03-18 | 1992-10-15 | Hitachi Ltd | Fluid pressure servo system |
| CN1800654A (en) * | 2005-12-20 | 2006-07-12 | 武汉科技大学 | Asymmetric cylinder closed-loop speed system controlled by electro-hydraulic proportional pump |
| CN1818382A (en) * | 2006-03-07 | 2006-08-16 | 太原理工大学 | Closed electrohydraulic controlling system |
| CN201166021Y (en) * | 2008-03-05 | 2008-12-17 | 陈岩 | Pump control type electrohydraulic actuator |
| US8453441B2 (en) * | 2008-11-06 | 2013-06-04 | Purdue Research Foundation | System and method for pump-controlled cylinder cushioning |
| CN103307060A (en) * | 2013-06-18 | 2013-09-18 | 南京埃尔法电液技术有限公司 | Direct drive type servo pump control electro-hydraulic combined driving hydraulic cylinder control system and control method |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105485077A (en) * | 2014-09-19 | 2016-04-13 | 鞍钢股份有限公司 | Hydraulic speed regulation loop system and method for axial plunger variable displacement motor |
| CN105003481A (en) * | 2015-07-01 | 2015-10-28 | 天津大学 | Integrated variable-damping hydraulic support system |
| CN105003481B (en) * | 2015-07-01 | 2017-02-01 | 天津大学 | Integrated variable-damping hydraulic support system |
| CN106224320A (en) * | 2016-09-12 | 2016-12-14 | 天津大学 | Inbuilt displacement sensor integrated form list rod symmetrical hydraulic cylinder |
| CN108691840A (en) * | 2017-03-31 | 2018-10-23 | 住友重机械工业株式会社 | Position control, fluid pressure drive device |
| CN112088058A (en) * | 2018-05-07 | 2020-12-15 | 普锐特冶金技术德国有限公司 | Lifting device for metallurgical ladles and treatment device for liquid metal |
| CN108916139A (en) * | 2018-06-15 | 2018-11-30 | 沪东中华造船(集团)有限公司 | A kind of fluid pressure type moulding bed support system and its application method |
| CN108916139B (en) * | 2018-06-15 | 2020-08-07 | 沪东中华造船(集团)有限公司 | Hydraulic type jig frame supporting system and using method thereof |
| CN110259770A (en) * | 2019-06-03 | 2019-09-20 | 长沙中联重科环境产业有限公司 | Compression type garbage truck pressure fills out system and noise control method |
| CN114508520A (en) * | 2020-11-16 | 2022-05-17 | 中国石油化工股份有限公司 | Director hydraulic integrated system for coiled tubing |
| CN113550942A (en) * | 2021-07-15 | 2021-10-26 | 南通睿基自动化技术有限公司 | Electrohydraulic control hydraulic vibration cylinder of servo pump |
| CN113550942B (en) * | 2021-07-15 | 2024-03-29 | 南通睿基自动化技术有限公司 | Electrohydraulic control hydraulic vibration cylinder of servo pump |
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