CN102927088A - Pressure control method of hydraulic pump system - Google Patents
Pressure control method of hydraulic pump system Download PDFInfo
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- CN102927088A CN102927088A CN2012104631225A CN201210463122A CN102927088A CN 102927088 A CN102927088 A CN 102927088A CN 2012104631225 A CN2012104631225 A CN 2012104631225A CN 201210463122 A CN201210463122 A CN 201210463122A CN 102927088 A CN102927088 A CN 102927088A
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- pressure
- pressure control
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- variable
- pump
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Abstract
The invention discloses a pressure control method of a hydraulic pump system. The pressure control method comprises the steps as follows: mounting a variable pump and a pressure control valve in the system; setting the setting pressure of a spring of the pressure control valve to reach the maximum safe working pressure of the variable pump; moving a core of the pressure control valve rightwards once the output pressure of the variable pump is more than the setting pressure of the spring of the pressure control valve, so as to place the pressure control valve to a left position; transferring the oil output by the variable pump into a rod-free chamber of a variable oil tank through the pressure control valve, so that an inclined plate of the variable pump can be driven to move toward a direction where the output volume is reduced while a piston of the variable oil tank moves leftwards; transferring the oil output by the variable pump into the variable oil tank by a load sensitive control valve and the pressure control valve respectively until the force on the core of the load sensitive control valve is balanced. The pressure control method has the beneficial effects that the pump can be matched with the load due to the reasonable utilization of a steering pump, so that normal working state can be achieved quickly, the working efficiency of the whole equipment can be improved, and the electricity can be saved.
Description
Technical field
The present invention relates to the hydraulics field, relate in particular to a kind of hydraulic pump system compress control method.
Background technique
Hydraulic system is constituent element important in the loader, and the upset of the swing arm lifting of loader, scraper bowl and complete machine such as turn to all to need to drive to finish by hydraulic system at the elemental motion.The too high problem of oil temperature often appears in loader in use hydraulic system, show according to factual survey, during loader work oil temperature in hydraulic system higher be one of principal element of affecting hydraulic system and reliability of hydraulic component and complete machine working efficiency.Therefore, guaranteeing that the thermal equilibrium temperature of loader hydraulic system is in normal state, is to guarantee the loader reliably working, improves the key of hydraulic system efficient; Cause that the too high factor of oil temperature in hydraulic system mainly contains: the pressure loss of the volumetric loss of oil hydraulic pump and oil hydraulic cylinder, valve element and pipeline parts, the mechanical friction loss of each class component etc.These losses finally form power losses and generate heat, the heat that produces is dispersed into the space by radiator and each hydraulic element, pipeline, tank surface except a part, load variations was larger when all the other major parts can cause the work of hydraulic oil temperature rising loader, and machining device hydraulic system is driven by metering pump.Therefore, spill losses, meta off-load loss and the restriction loss of hydraulic system of loading machine working device under different operating modes is the one of the main reasons that causes that oil temperature is too high; For reducing spill losses, meta off-load loss and the restriction loss of hydraulic system of loading machine working device under different operating modes, the utilization ratio that improves hydraulic system has great importance.Loader is to use very widely a kind of engineering machinery, its groundwork device is swing arm and scraper bowl, elemental motion comprises: scraper bowl is inserted then reversible bucket of material, improving material is to certain altitude, when keeping load, material transportation is arrived the appointed place, dump, return at last charging place, so cycle operation.But the main cause of a lot of hydraulic system of loading machine working device energy losses is output flow, the delivery pressure of pump can not be complementary with flow, the pressure of loading demand, and namely delivery pressure can't adapt to the demand of induced pressure automatically.
Summary of the invention
The purpose of this invention is to provide and a kind ofly make pump and load mutually mate, improve hydraulic system efficient, saving power, can reduce the hydraulic pump system compress control method of equipment cost, to solve many deficiencies of prior art.
Purpose of the present invention is come specific implementation by the following technical programs:
A kind of hydraulic pump system compress control method mainly is comprised of following steps:
⑴ at first be respectively installed to the position with used motor and oil pump unit, oil hydraulic motor, connects successively throttle valve, electronic one-way valve and accumulator at the outside oil circuit of set oil hydraulic motor;
⑵ install a variable displacement pump and a pressure controlled valve in said system, the set pressure of pressure controlled valve spring is set as the maximum safe working pressure of variable displacement pump; When the delivery pressure of variable displacement pump during greater than the setting pressure of pressure controlled valve spring, impel the spool of pressure controlled valve to move right, make pressure controlled valve be in left position;
⑶ the fluid of variable displacement pump output at first passes through the rodless cavity of pressure controlled valve entering variable oil cylinder, and the piston that makes the variable oil cylinder is to left movement the time, drives the direction motion that the swash plate of variable displacement pump reduces towards discharge capacity, until almost nil;
⑷ load sensing multi-way valve is selected the load-sensitive type, variable displacement pump is exported fluid pass through respectively load-sensitive control valve and pressure controlled valve, and the entering variable oil cylinder is until the stressed balance that again reaches of the spool of load-sensitive control valve.
The beneficial effect of hydraulic pump system compress control method of the present invention is: the delivery pressure of pump and flow adapt to the demand of load automatically, be conducive to rationally utilize steering pump to make pump and load mutually mate, improve hydraulic system efficient, can enter very soon normal working, improve the working efficiency of Whole Equipment, saved electric energy.
Embodiment
The described hydraulic pump system compress control method of the embodiment of the invention, its key step comprises:
⑴ at first be respectively installed to the position with used motor and oil pump unit, oil hydraulic motor, connects successively throttle valve, electronic one-way valve and accumulator at the outside oil circuit of set oil hydraulic motor;
⑵ install a variable displacement pump and a pressure controlled valve in said system, the set pressure of pressure controlled valve spring is set as the maximum safe working pressure of variable displacement pump; When the delivery pressure of variable displacement pump during greater than the setting pressure of pressure controlled valve spring, impel the spool of pressure controlled valve to move right, make pressure controlled valve be in left position;
⑶ the fluid of variable displacement pump output at first passes through the rodless cavity of pressure controlled valve entering variable oil cylinder, and the piston that makes the variable oil cylinder is to left movement the time, drives the direction motion that the swash plate of variable displacement pump reduces towards discharge capacity, until almost nil;
⑷ load sensing multi-way valve is selected the load-sensitive type, variable displacement pump is exported fluid pass through respectively load-sensitive control valve and pressure controlled valve, and the entering variable oil cylinder is until the stressed balance that again reaches of the spool of load-sensitive control valve.
Claims (1)
1. a hydraulic pump system compress control method is characterized in that, mainly is comprised of following steps:
⑴ at first be respectively installed to the position with used motor and oil pump unit, oil hydraulic motor, connects successively throttle valve, electronic one-way valve and accumulator at the outside oil circuit of set oil hydraulic motor;
⑵ install a variable displacement pump and a pressure controlled valve in said system, the set pressure of pressure controlled valve spring is set as the maximum safe working pressure of variable displacement pump; When the delivery pressure of variable displacement pump during greater than the setting pressure of pressure controlled valve spring, impel the spool of pressure controlled valve to move right, make pressure controlled valve be in left position;
⑶ the fluid of variable displacement pump output at first passes through the rodless cavity of pressure controlled valve entering variable oil cylinder, and the piston that makes the variable oil cylinder is to left movement the time, drives the direction motion that the swash plate of variable displacement pump reduces towards discharge capacity, until almost nil;
⑷ load sensing multi-way valve is selected the load-sensitive type, variable displacement pump is exported fluid pass through respectively load-sensitive control valve and pressure controlled valve, and the entering variable oil cylinder is until the stressed balance that again reaches of the spool of load-sensitive control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104631225A CN102927088A (en) | 2012-11-16 | 2012-11-16 | Pressure control method of hydraulic pump system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104631225A CN102927088A (en) | 2012-11-16 | 2012-11-16 | Pressure control method of hydraulic pump system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102927088A true CN102927088A (en) | 2013-02-13 |
Family
ID=47641981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104631225A Withdrawn CN102927088A (en) | 2012-11-16 | 2012-11-16 | Pressure control method of hydraulic pump system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102927088A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05253776A (en) * | 1992-03-13 | 1993-10-05 | Yaskawa Electric Corp | Hydraulic pressure generating device and working machine provided with device thereof |
| CN2589425Y (en) * | 2002-10-29 | 2003-12-03 | 柯坚 | Load sensitive confluent hydraulic system for loader |
| CN2615102Y (en) * | 2002-10-29 | 2004-05-12 | 柯坚 | Loading sensitive steering hydraulic system for loader |
| CN200961671Y (en) * | 2006-08-23 | 2007-10-17 | 泰安龙泰机械有限公司 | Hydraulic transmission, work device of loader |
| CN201581431U (en) * | 2009-12-18 | 2010-09-15 | 广西柳工机械股份有限公司 | Loader load sensitization hydraulic device |
-
2012
- 2012-11-16 CN CN2012104631225A patent/CN102927088A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05253776A (en) * | 1992-03-13 | 1993-10-05 | Yaskawa Electric Corp | Hydraulic pressure generating device and working machine provided with device thereof |
| CN2589425Y (en) * | 2002-10-29 | 2003-12-03 | 柯坚 | Load sensitive confluent hydraulic system for loader |
| CN2615102Y (en) * | 2002-10-29 | 2004-05-12 | 柯坚 | Loading sensitive steering hydraulic system for loader |
| CN200961671Y (en) * | 2006-08-23 | 2007-10-17 | 泰安龙泰机械有限公司 | Hydraulic transmission, work device of loader |
| CN201581431U (en) * | 2009-12-18 | 2010-09-15 | 广西柳工机械股份有限公司 | Loader load sensitization hydraulic device |
Non-Patent Citations (1)
| Title |
|---|
| 李晶洁等: "负载敏感变量泵在装载机液压系统上的应用与节能分析", 《流体传动与控制》 * |
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| PB01 | Publication | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20130213 |