CN103085865B - Loader load sensitization steering hydraulic system - Google Patents
Loader load sensitization steering hydraulic system Download PDFInfo
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- CN103085865B CN103085865B CN201210502624.4A CN201210502624A CN103085865B CN 103085865 B CN103085865 B CN 103085865B CN 201210502624 A CN201210502624 A CN 201210502624A CN 103085865 B CN103085865 B CN 103085865B
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Abstract
The load-sensitive steering hydraulic system that a kind of loading machine uses. Be characterized in that load-sensitive Variable plunger pump provides operating oil pressure to flux amplification valve, steering gear, actuator port from flux amplification valve main valve plug feeds back a pressure signal and is passed to the LS valve port of preferential valve rod spring cavity and variable pump, the open and close signal of pressure-gradient control valve feeds back after by flux amplification valve main valve plug valve, the main valve plug of flux amplification valve is subject to steering gear control, and steering gear and steering wheel pass through spline joint; Described steering gear L hydraulic fluid port is communicated with flux amplification valve main valve plug valve L right-hand member, and R hydraulic fluid port is communicated with flux amplification valve main valve plug valve R left end. Its advantage is the function that makes full use of load-sensitive Variable plunger pump change discharge capacity, increases and turns to pump delivery, reaches the lifting of steering behaviour, and the while is capable of saving fuel oil and raising operating efficiency also.
Description
Technical field
Of the present inventionly relate to a kind of steering hydraulic system for engineering machinery, be specially adapted to the load-sensitive of loading machineSteering hydraulic system.
Background technology
Common loading machine is made up of steering and work system, steering and work system or independence, or interflow.In quantitative system, in order both to meet the requirement that turns to performance when engine idle and the high speed, meet again minimizing simultaneously and turn toThe requirement of system energy loss, steering pump is generally all selected not quite, all little or equal than working barrel in converging system. As take into accountArrive 2 requirements above, the steering behaviour meeting variation of steering in the time of low speed, subject matter is for reacting slow, turning velocitySlowly, cause turning to efficiency low, driver's labour intensity is large. This has just affected performance and the investment repayment of whole loading machine.
Summary of the invention
Object of the present invention be just to provide one make steering behaviour engine idle during with high speed performance consistent, and turn toSpeed can remain on 3 seconds about (from limit on the left to limit on the right-right-hand limit angle), and the corresponding steering wheel speed that obtains is in 3 circles left and right. This raisingThe comfortableness of driver operation loading machine, also improved loading machine operating efficiency loading machine use load-sensitive steering hydraulicSystem.
Solution of the present invention is such:
The present invention includes:
Steering: described steering is mainly by the first load-sensitive constant pressure variable plunger pump, band pressure-gradient control valve functionWith flux amplification valve, steering gear, the steering cylinder composition of load signal feedback function, described load-sensitive constant-pressure variable plungerPump provides operating oil pressure to flux amplification valve, steering gear, and the actuator port from flux amplification valve main valve plug feeds back a pressure letterNumber and be passed to the LS valve port of preferential valve rod spring cavity and variable pump, the pressure-gradient control valve in the flux amplification valve with pressure-gradient control valve function isStatic pressure-gradient control valve, the open and close signal of pressure-gradient control valve feeds back after by flux amplification valve main valve plug valve, the main valve of flux amplification valveCore is subject to steering gear control, and steering gear and steering wheel pass through spline joint; Described steering gear L hydraulic fluid port is communicated with flux amplification valve main valve plugValve L right-hand member, R hydraulic fluid port is communicated with flux amplification valve main valve plug valve R left end.
Advantage of the present invention is the function that makes full use of load-sensitive Variable plunger pump change discharge capacity, increases the row of steering pumpAmount, reaches the lifting of steering behaviour, and the while is capable of saving fuel oil and raising operating efficiency also. The Flow amplification valve arrangement letter adoptingSingle, and also realized production domesticization, cost is lower than adopting the flux amplification valve of import, can realize production in enormous quantities.
Brief description of the drawings
Accompanying drawing is embodiments of the invention.
Accompanying drawing 1 is steering hydraulic schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail.
The present invention includes:
Steering: described steering is mainly by hydraulic oil container 1, the first load-sensitive Variable plunger pump 2, pressure-reducing valve3, the steering gear 4 of small displacement, the flux amplification valve 5 with pressure-gradient control valve function and load signal feedback function, left steering oil cylinder 6, the right sideSteering cylinder 7, check valve 8 and shuttle valve 9 form, and described load-sensitive Variable plunger pump 2 is carried to flux amplification valve 5, steering gear 4For operating oil pressure, the LS control valve of the responsive Variable plunger pump 2 of the load feedback pressure signal control overhead of flux amplification valve 5; InstituteThe L hydraulic fluid port of stating steering gear 4 is communicated with the main valve plug valve L right-hand member of flux amplification valve 5, and R hydraulic fluid port is communicated with the main valve plug valve of flux amplification valve 5R right-hand member;
The converging system of steering and other work system: described converging system comprise flux amplification valve EF mouth andHydraulic Elements are controlled at the interflow that is connected with flux amplification valve EF mouth, and the Hydraulic Elements that described interflow is controlled are used for ensureing that flow putsThe hydraulic oil that the EF mouth of large valve flows out can only one direction to other work system fuel feeding, in the present embodiment, hydraulic pressure unit is controlled at interflowPart is to adopt check valve 8.
The loading machine hydraulic system of working of other work system of the present embodiment as shown in accompanying drawing Block Diagrams.
Pressure-gradient control valve in described flux amplification valve 5 is static pressure-gradient control valve, and the open and close signal of pressure-gradient control valve is by flowAfter amplifying valve main valve plug valve, feed back.
The present embodiment is the steering gear that adopts 125cc/r discharge capacity, the first load-sensitive Variable plunger pump and of 100cc/rThe individual flux amplification valve 5 with pressure-gradient control valve function forms.
The LS signal of the first load-sensitive Variable plunger pump 2 of 100cc/r is anti-by the flux amplification valve 5 with pressure-gradient control valve functionFeedback, the pressure-gradient control valve in the flux amplification valve 5 with pressure-gradient control valve function is static pressure-gradient control valve, the open and close signal of pressure-gradient control valve is by flowingAfter amount amplifying valve main valve plug valve, feed back, the main valve plug of flux amplification valve is controlled by steering gear 4, and steering gear 4 is passed through flower with steering wheelKey connects.
When steering wheel turns left, the L hydraulic fluid port of steering gear 4 is fuel-displaced, and leads to flux amplification valve main valve plug valve L right-hand member, and flow is putLarge valve 5 main valve plug valves move left under the oil pressure effect of right-hand member, and flux amplification valve main valve plug valve feeds back a signal to pressure-gradient control valveThe LS mouth of spring cavity end and pump, pressure-gradient control valve spool moves, simultaneously the LS signal control valve liquid of the first load-sensitive Variable plunger pump 2The mobile discharge capacity of controlling the first load-sensitive Variable plunger pump 2, the discharge capacity that makes the first load-sensitive Variable plunger pump 1 with turn toSpeed is proportional, and the discharge capacity of the first load-sensitive Variable plunger pump 2 increases, and flow is raised to and turns to the flow needing from 0L/min,The P that is pump by path of oilPumpMouthful to the P1 mouth of pressure-gradient control valve, then by the CF mouth of pressure-gradient control valve the P2 mouth to Flow amplification spool,After flow to the B mouth of steering cylinder by the B mouth of Flow amplification spool, flow back to fuel tank by the A mouth of oil cylinder, the T mouth of Flow amplification spool,Realize left steering.
When steering wheel is turned right, the R hydraulic fluid port of steering gear 4 is fuel-displaced, and leads to flux amplification valve main valve plug valve R left end, and flow is putLarge valve 5 main valve plug valves move right under the oil pressure effect of left end, and flux amplification valve main valve plug valve feeds back a signal to pressure-gradient control valveThe LS mouth of spring cavity end and pump, pressure-gradient control valve spool moves, simultaneously the LS signal control valve liquid of the first load-sensitive Variable plunger pump 2The mobile discharge capacity of controlling the first load-sensitive Variable plunger pump 2, the discharge capacity that makes the first load-sensitive Variable plunger pump 1 with turn toSpeed is proportional, and the discharge capacity of the first load-sensitive Variable plunger pump 2 increases, and flow is raised to and turns to the flow needing from 0L/min,The P that is pump by path of oilPumpMouthful to the P1 mouth of pressure-gradient control valve, then by the CF mouth of pressure-gradient control valve the P2 mouth to Flow amplification spool,After flow to the A mouth of steering cylinder by the A mouth of Flow amplification spool, flow back to fuel tank by the B mouth of oil cylinder, the T mouth of Flow amplification spool,Realize right turn.
In the time that steering wheel does not turn to, the L of steering gear 4, R hydraulic fluid port do not have oil to flow out, at two of flux amplification valve 5 main valve plug valvesEnd does not have the effect of pressure oil yet, and flux amplification valve 5 main valve plug valves are in meta, the LS signal port of flux amplification valve and fuel tank 1Be connected, the spring cavity without pressure feedback to pressure-gradient control valve, pressure-gradient control valve spool is in left function position, and the LS signal port of pump does not have yet simultaneouslyHave pressure, the discharge capacity of the first load-sensitive Variable plunger pump 2 is 0, and flow is also 0L/min, makes hydraulic circuit PPumpTo pressure-gradient control valveP1 mouth, the CF mouth of pressure-gradient control valve, the P2 mouth of Flow amplification spool, the A of Flow amplification spool, B mouth, the A of oil cylinder, B mouth there is no oilPass through, steering mechanism is in motion state not.
In the time that two hydraulic systems of need are collaborated work, the hydraulic oil that the EF mouth of flux amplification valve provides passes through check valve8 one directions are to hydraulic system of working fuel feeding.
Claims (1)
1. a loader load sensitization steering hydraulic system, is characterized in that comprising:
Steering: described steering is mainly believed by the first load-sensitive Variable plunger pump, band pressure-gradient control valve function and loadThe flux amplification valve of number feedback function, steering gear, steering cylinder composition, described load-sensitive Variable plunger pump is to Flow amplificationValve, steering gear provide operating oil pressure, and the actuator port from flux amplification valve main valve plug feeds back a pressure signal and is passed to excellentThe LS valve port of first valve rod spring cavity and variable pump, the pressure-gradient control valve in the flux amplification valve with pressure-gradient control valve function is static pressure-gradient control valve,The open and close signal of pressure-gradient control valve feeds back after by flux amplification valve main valve plug valve, and the main valve plug of flux amplification valve is subject to steering gear controlSystem, steering gear and steering wheel pass through spline joint; Described steering gear L hydraulic fluid port is communicated with flux amplification valve main valve plug valve L right-hand member, R oilMouth is communicated with flux amplification valve main valve plug valve R left end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210502624.4A CN103085865B (en) | 2012-11-30 | 2012-11-30 | Loader load sensitization steering hydraulic system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210502624.4A CN103085865B (en) | 2012-11-30 | 2012-11-30 | Loader load sensitization steering hydraulic system |
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| Publication Number | Publication Date |
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| CN103085865A CN103085865A (en) | 2013-05-08 |
| CN103085865B true CN103085865B (en) | 2016-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210502624.4A Active CN103085865B (en) | 2012-11-30 | 2012-11-30 | Loader load sensitization steering hydraulic system |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103359594B (en) * | 2013-07-30 | 2016-01-20 | 西安煤矿机械有限公司 | A kind of lock tank cage chair |
| CN103696997B (en) * | 2013-12-18 | 2015-12-30 | 柳州柳工挖掘机有限公司 | There is the hydraulic system of priority function |
| CN104029721B (en) * | 2014-01-23 | 2016-09-07 | 广西柳工机械股份有限公司 | Loader hydraulic transfer |
| CN104192201B (en) * | 2014-08-18 | 2016-06-29 | 柳州柳工液压件有限公司 | Hydraulic steering control valve and hydraulic steering system |
| CN104481948B (en) * | 2014-10-28 | 2017-01-11 | 广西柳工机械股份有限公司 | Stabilized pressure flow control valve and load sensitive analog valve |
| CN105201944B (en) * | 2015-09-25 | 2017-10-03 | 广西柳工机械股份有限公司 | Flux amplification valve and steering hydraulic system |
| CN105387032B (en) * | 2015-12-22 | 2017-11-03 | 江苏师范大学 | A kind of liquid energy feedback energy-saving device for load-sensitive ratio control system |
| CN106762928B (en) * | 2017-01-17 | 2018-10-16 | 徐工集团工程机械有限公司 | Automobile hydraulic system and engineering truck with it |
| CN115584772B (en) * | 2022-12-13 | 2023-03-21 | 徐工集团工程机械股份有限公司科技分公司 | Energy-saving hydraulic system of electric loader and electric loader |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2589425Y (en) * | 2002-10-29 | 2003-12-03 | 柯坚 | Load sensitive confluent hydraulic system for loader |
| CN201357777Y (en) * | 2009-02-24 | 2009-12-09 | 宝山钢铁股份有限公司 | Two-way hydraulic system of transporting rack car |
| 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 |
| CN102363432A (en) * | 2011-06-30 | 2012-02-29 | 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 | Steering control device for electric wheel mining dump trucks |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101680902B1 (en) * | 2010-11-20 | 2016-11-29 | 주식회사 두산 | Steering load sensing system for a heavy equipment |
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2012
- 2012-11-30 CN CN201210502624.4A patent/CN103085865B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2589425Y (en) * | 2002-10-29 | 2003-12-03 | 柯坚 | Load sensitive confluent hydraulic system for loader |
| CN201357777Y (en) * | 2009-02-24 | 2009-12-09 | 宝山钢铁股份有限公司 | Two-way hydraulic system of transporting rack car |
| 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 |
| CN102363432A (en) * | 2011-06-30 | 2012-02-29 | 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 | Steering control device for electric wheel mining dump trucks |
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| CN103085865A (en) | 2013-05-08 |
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