CN102937085A - Displacement adjusting method for positive-flow hydraulic pump of excavator - Google Patents
Displacement adjusting method for positive-flow hydraulic pump of excavator Download PDFInfo
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- CN102937085A CN102937085A CN2012104631244A CN201210463124A CN102937085A CN 102937085 A CN102937085 A CN 102937085A CN 2012104631244 A CN2012104631244 A CN 2012104631244A CN 201210463124 A CN201210463124 A CN 201210463124A CN 102937085 A CN102937085 A CN 102937085A
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Abstract
The invention discloses a displacement adjusting method for a positive-flow hydraulic pump of an excavator. A throttle opening is arranged on an oil return passage in a multiple directional control valve in a hydraulic system, and a plurality of pilot valves are installed outside a variable pump; largest pilot pressure is selected through a shuttle valve group to control the displacement of the hydraulic pump, and a displacement value of the hydraulic pump is controlled according to opening degrees of a way of valves with largest pilot pressure; an electric control unit of the hydraulic pump is reserved on one of main valves, and the pilot pressure of the main valves is converted into electrical signals through a pressure sensor; main hydraulic pump outlet pressure is detected to calculate another displacement value of the main pump according to a curve, the displacement of the main pump is adjusted according to the two values; and the pressure sensor, a tilt angle sensor and a displacement sensor are arranged at corresponding positions of the excavator. The displacement adjusting method for the positive-flow hydraulic pump of the excavator has the advantages that the output flow of the hydraulic pump is in accordance with the operation of operators, the response time is short, the flow fluctuation is small, the operability is good, and the working efficiency can be improved.
Description
Technical field
The present invention relates to the hydraulics field, relate in particular to a kind of positive flow hydraulic pump of excavator discharge capacity regulating method.
Background technique
Hydraulic system has that power is large, working pressure and the flow adjustability is good, heat can be brought back the advantages such as fuel tank.But there is the multiple energy conversion in hydraulic transmission, and hydraulic oil container causes latency environment to pollute and the loss of oil, therefore, and the essential performance that improves hydraulic transmission and control of hydraulics, could adapt to sustainable development and energy-conservation needs, ability raising and Electrified Transmission, mechanical transmission competitive capacity.The current main-stream excavator still adopts multi-way valve as main control valve, the main power loss of this type systematic comprise that restriction loss, swirl gear start and braking process in spill losses, the losses of potential energy in the swing arm decline process and restriction loss and the bad and loss that causes of motor and hydraulic system power coupling.Development along with Energy Saving Technology by Hydraulic Pressure, the hydraulic system of excavator develops into the multiple control modes such as minus flow control, positive flow control and load-sensitive control, obviously exist a lot of defectives, for example the multi-way valve dead band is large, speed adjustable range is limited and be subjected to load effect larger, and these all can cause the product occupancy lower.
Summary of the invention
The purpose of this invention is to provide and a kind ofly reduce labor intensity, make power system and load power demand coupling is better, system's heating reduces, fuel consume reduces positive flow hydraulic pump of excavator discharge capacity regulating method, to solve many deficiencies of prior art.
Purpose of the present invention is come specific implementation by the following technical programs:
A kind of positive flow hydraulic pump of excavator discharge capacity regulating method mainly is comprised of following steps:
At first, the multiple directional control valve meta drainback passage in hydraulic system arranges a restriction, some Leading valves is installed variable displacement pump is outside;
⑵ utilize the shuttle valve group to choose the displacement control that maximum pilot pressure carries out oil hydraulic pump, and according to one tunnel valve opening control hydraulic pressure pump delivery of pilot pressure maximum, other each valve does not participate in control procedure, calculates single flow when each valve operates simultaneously;
⑶ reserve the electric controller of an oil hydraulic pump at main valve, the pilot pressure of each main valve utilizes pressure transducer to convert electrical signal to, and microprocessor is all electrical signal additions, and regulate reduction valve by direct proportaion and control the hydraulic pressure pump delivery;
⑷ by detecting the Main Hydraulic Pump outlet pressure, obtain another displacement value of main pump according to curve calculation, then adjust the discharge capacity of main pump according to these two values, at corresponding site difference setting pressure sensor, dip sensor, the displacement transducer of excavator, controller will detect data and the corresponding boundary conditions of excavator when each operating mode operation compares the mode of operation of distinguishing current excavator.
The beneficial effect of positive flow hydraulic pump of excavator discharge capacity regulating method of the present invention is: the flow loss that can reduce main control valve oil hydraulic pump when meta, make the output flow of oil hydraulic pump according to operator's operation, response time is shorter, flowed fluctuation is less, operability is better, can increase work efficiency, simultaneously, impel system's heating minimizing, fuel consume to reduce, reach energy-conservation purpose.
Embodiment
The described positive flow hydraulic pump of excavator of embodiment of the invention discharge capacity regulating method, its key step comprises:
At first, the multiple directional control valve meta drainback passage in hydraulic system arranges a restriction, some Leading valves is installed variable displacement pump is outside;
⑵ utilize the shuttle valve group to choose the displacement control that maximum pilot pressure carries out oil hydraulic pump, and according to one tunnel valve opening control hydraulic pressure pump delivery of pilot pressure maximum, other each valve does not participate in control procedure, calculates single flow when each valve operates simultaneously;
⑶ reserve the electric controller of an oil hydraulic pump at main valve, the pilot pressure of each main valve utilizes pressure transducer to convert electrical signal to, and microprocessor is all electrical signal additions, and regulate reduction valve by direct proportaion and control the hydraulic pressure pump delivery;
⑷ by detecting the Main Hydraulic Pump outlet pressure, obtain another displacement value of main pump according to curve calculation, then adjust the discharge capacity of main pump according to these two values, at corresponding site difference setting pressure sensor, dip sensor, the displacement transducer of excavator, controller will detect data and the corresponding boundary conditions of excavator when each operating mode operation compares the mode of operation of distinguishing current excavator.
Claims (1)
1. a positive flow hydraulic pump of excavator discharge capacity regulating method is characterized in that, mainly is comprised of following steps:
At first, the multiple directional control valve meta drainback passage in hydraulic system arranges a restriction, some Leading valves is installed variable displacement pump is outside;
⑵ utilize the shuttle valve group to choose the displacement control that maximum pilot pressure carries out oil hydraulic pump, and according to one tunnel valve opening control hydraulic pressure pump delivery of pilot pressure maximum, other each valve does not participate in control procedure, calculates single flow when each valve operates simultaneously;
⑶ reserve the electric controller of an oil hydraulic pump at main valve, the pilot pressure of each main valve utilizes pressure transducer to convert electrical signal to, and microprocessor is all electrical signal additions, and regulate reduction valve by direct proportaion and control the hydraulic pressure pump delivery;
⑷ by detecting the Main Hydraulic Pump outlet pressure, obtain another displacement value of main pump according to curve calculation, then adjust the discharge capacity of main pump according to these two values, at corresponding site difference setting pressure sensor, dip sensor, the displacement transducer of excavator, controller will detect data and the corresponding boundary conditions of excavator when each operating mode operation compares the mode of operation of distinguishing current excavator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104631244A CN102937085A (en) | 2012-11-16 | 2012-11-16 | Displacement adjusting method for positive-flow hydraulic pump of excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104631244A CN102937085A (en) | 2012-11-16 | 2012-11-16 | Displacement adjusting method for positive-flow hydraulic pump of excavator |
Publications (1)
| Publication Number | Publication Date |
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| CN102937085A true CN102937085A (en) | 2013-02-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104631244A Pending CN102937085A (en) | 2012-11-16 | 2012-11-16 | Displacement adjusting method for positive-flow hydraulic pump of excavator |
Country Status (1)
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| CN (1) | CN102937085A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103233494A (en) * | 2013-05-09 | 2013-08-07 | 上海三一重机有限公司 | Energy-saving control system, excavator and method |
| CN115324150A (en) * | 2022-08-25 | 2022-11-11 | 江苏徐工工程机械研究院有限公司 | Control method of loader-digger and loader-digger |
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| US5476367A (en) * | 1994-07-07 | 1995-12-19 | Shurflo Pump Manufacturing Co. | Booster pump with sealing gasket including inlet and outlet check valves |
| CN1670317A (en) * | 2004-03-18 | 2005-09-21 | 神钢建设机械株式会社 | Hydraulic control device for working machine |
| CN200968277Y (en) * | 2006-09-03 | 2007-10-31 | 内蒙古北方重型汽车股份有限公司 | Composite hydraulic energy-saving controller |
| CN201202622Y (en) * | 2008-04-03 | 2009-03-04 | 中山市钜通机电技术有限公司 | Proportional variable plunger pump |
| US20100183448A1 (en) * | 2007-05-11 | 2010-07-22 | Edward Leugemors | Methods of use for a positive displacement pump having an externally assisted valve |
| US20110041681A1 (en) * | 2009-08-21 | 2011-02-24 | Michael Duerr | Positive-displacement machine |
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2012
- 2012-11-16 CN CN2012104631244A patent/CN102937085A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5476367A (en) * | 1994-07-07 | 1995-12-19 | Shurflo Pump Manufacturing Co. | Booster pump with sealing gasket including inlet and outlet check valves |
| CN1670317A (en) * | 2004-03-18 | 2005-09-21 | 神钢建设机械株式会社 | Hydraulic control device for working machine |
| CN200968277Y (en) * | 2006-09-03 | 2007-10-31 | 内蒙古北方重型汽车股份有限公司 | Composite hydraulic energy-saving controller |
| US20100183448A1 (en) * | 2007-05-11 | 2010-07-22 | Edward Leugemors | Methods of use for a positive displacement pump having an externally assisted valve |
| CN201202622Y (en) * | 2008-04-03 | 2009-03-04 | 中山市钜通机电技术有限公司 | Proportional variable plunger pump |
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Non-Patent Citations (4)
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| 仉志强等: "中型挖掘机正流量控制特性的分析与改进", 《液压气动与密封》 * |
| 张建卓等: "挖掘机合成式先导压力正流量控制系统研究", 《中国机械工程》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103233494A (en) * | 2013-05-09 | 2013-08-07 | 上海三一重机有限公司 | Energy-saving control system, excavator and method |
| CN103233494B (en) * | 2013-05-09 | 2015-09-16 | 上海三一重机有限公司 | A kind of energy-saving control system, excavator and method |
| CN115324150A (en) * | 2022-08-25 | 2022-11-11 | 江苏徐工工程机械研究院有限公司 | Control method of loader-digger and loader-digger |
| CN115324150B (en) * | 2022-08-25 | 2023-09-05 | 江苏徐工工程机械研究院有限公司 | Control method of backhoe loader and backhoe loader |
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Application publication date: 20130220 |