CN102635144A - Hydraulic system for loader - Google Patents

Hydraulic system for loader Download PDF

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Publication number
CN102635144A
CN102635144A CN2012101356033A CN201210135603A CN102635144A CN 102635144 A CN102635144 A CN 102635144A CN 2012101356033 A CN2012101356033 A CN 2012101356033A CN 201210135603 A CN201210135603 A CN 201210135603A CN 102635144 A CN102635144 A CN 102635144A
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fluid port
hydraulic
solenoid
hydraulic fluid
valve
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CN2012101356033A
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CN102635144B (en
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曲金玉
任传波
周英超
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Shandong University of Technology
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Shandong University of Technology
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Abstract

The invention discloses a hydraulic system of a loader. The hydraulic system comprises a hydraulic pump, a low pressure sealed oil tank, a high pressure energy accumulator, a medium pressure energy accumulator and a hydraulic control unit, wherein the hydraulic control unit is integrated with a first one-way valve, a second one-way valve, a third one-way valve, a first safety valve, a second safety valve, a third safety valve, a first pressure sensor, a second pressure sensor, a first magnetic exchange valve, a second magnetic exchange valve, a third magnetic exchange valve, a first magnetic proportional exchange valve, a second magnetic proportional exchange valve, a third magnetic proportional exchange valve and a fourth magnetic proportional exchange valve. The hydraulic system for the loader provided by the invention utilizes the high pressure energy accumulator and the medium pressure energy accumulator to store kinetic energy in the braking process of loader and excess energy of the loader in low load conditions and stores potential energy of the movable arm in the falling process by the low pressure sealed oil tank, thereby achieving the purposes of reducing fuel consumption of the loader and increasing working efficiency of the loader.

Description

Loader hydraulic system
Technical field
The present invention relates to a kind of hydraulic system, more particularly, the present invention relates to a kind of loader hydraulic system.。
Background technology
Loader is widely used in construction such as mining site, capital construction, road maintenance occasion, mainly is that to adorn bulk materials such as native stone, mineral with shovel be main.Because it is simple and convenient, can save manpower in a large number, increases work efficiency, loader has become important engineering machinery.
In the prior art, loader hydraulic system comprises that hydraulic pump, boom cylinder, rotary ink tank, safety valve, oil filter, double acting safety valve, swing arm manually join guiding valve, rotating bucket and manually join guiding valve and open type oil tank.The loading operation process comprise go, spading, moved arm lifting, the scraper bowl that falls, the swing arm that falls etc. carry out cycle operation; The maximum engine load of spading process need wherein; Although and swing arm decline process is not because the existence of gravitional force needs the driving of motor; But existing loader still drives hydraulic pump works by engine running and accomplishes swing arm decline process; And can not reclaim the potential energy that swing arm falls, braking procedure also can't be recycled the kinetic energy of loader, thereby makes oil consumption height, the loading operation efficient of loader low.
Summary of the invention
The objective of the invention is to overcome above-mentioned defective, a kind of oil consumption of loader, loader hydraulic system of raising loading operation efficient of reducing is provided.
For solving the problems of the technologies described above, the present invention realizes storage, distribution, recovery and the release of hydraulic energy through adopting high pressure accumulator, intermediate-pressure accumulator, low pressure sealed reservoir and hydraulic control unit, and its technical scheme is:
A kind of loader hydraulic system comprises hydraulic pump, low pressure sealed reservoir, high pressure accumulator, intermediate-pressure accumulator, hydraulic control unit, boom cylinder, rotary ink tank, oil filter;
High pressure accumulator adopts piston type or bladder accumulator, and the operating pressure of high pressure accumulator is 16~35MPa, and intermediate-pressure accumulator adopts piston type or bladder accumulator, and the operating pressure of intermediate-pressure accumulator is 4~15MPa.
The low pressure sealed reservoir is the enclosed gas charging fuel tank, and the operating pressure of low pressure sealed reservoir is 0.5~3MPa.
Integrated first one way valve, second one way valve, the 3rd one way valve, first safety valve, second safety valve, the 3rd safety valve, first pressure sensor, second pressure sensor, first solenoid operated directional valve, second solenoid operated directional valve, the 3rd solenoid operated directional valve, the first solenoid-operated proportional reversal valve, the second solenoid-operated proportional reversal valve, the 3rd solenoid-operated proportional reversal valve and the 4th solenoid-operated proportional reversal valve, first pressure sensor and second pressure sensor of being equipped with of hydraulic control unit; Hydraulic control unit is provided with inner oil duct, and hydraulic control unit also is provided with hydraulic fluid port 6a, hydraulic fluid port 6b, hydraulic fluid port 6c, hydraulic fluid port 6d, hydraulic fluid port 6e, hydraulic fluid port 6f, hydraulic fluid port 6g, hydraulic fluid port 6h, hydraulic fluid port 6i, the hydraulic fluid port 6j that is connected with outside oil circuit;
First solenoid operated directional valve, second solenoid operated directional valve, the 3rd solenoid operated directional valve are the bi-bit bi-pass solenoid operated directional valves, and the first solenoid-operated proportional reversal valve, the second solenoid-operated proportional reversal valve, the 3rd solenoid-operated proportional reversal valve and the 4th solenoid-operated proportional reversal valve all are two-position four-way solenoid-operated proportional reversal valves.
The P1 hydraulic fluid port of first solenoid operated directional valve is interconnected through inside oil duct and the P2 oil-in of first one way valve, the 6a hydraulic fluid port of hydraulic control unit of hydraulic control unit, and the T1 hydraulic fluid port of first solenoid operated directional valve is interconnected through inside oil duct and the 6b hydraulic fluid port of hydraulic control unit, the T14 oil-out of first safety valve, the T12 hydraulic fluid port of the 4th solenoid-operated proportional reversal valve, the T4 hydraulic fluid port of the first solenoid-operated proportional reversal valve, the T11 hydraulic fluid port of the 3rd solenoid-operated proportional reversal valve, the T5 hydraulic fluid port of the second solenoid-operated proportional reversal valve, the T10 oil-out of second safety valve, the P9 oil-in of second one way valve, the T8 oil-out of the 3rd safety valve, the P7 oil-in of the 3rd one way valve of hydraulic control unit;
The T2 oil-out of first one way valve is interconnected through inside oil duct and the P3 hydraulic fluid port of second solenoid operated directional valve, the P13 hydraulic fluid port of the 3rd solenoid operated directional valve, the P14 hydraulic fluid port of first safety valve of hydraulic control unit;
The T3 hydraulic fluid port of second solenoid operated directional valve is interconnected through inside oil duct and the P4 hydraulic fluid port of the first solenoid-operated proportional reversal valve, the P11 hydraulic fluid port of the 3rd solenoid-operated proportional reversal valve, the 6g hydraulic fluid port of hydraulic control unit, the 6h hydraulic fluid port of hydraulic control unit of hydraulic control unit;
The T13 hydraulic fluid port of the 3rd solenoid operated directional valve is interconnected through inside oil duct and the P12 hydraulic fluid port of the 4th solenoid-operated proportional reversal valve, the P5 hydraulic fluid port of the second solenoid-operated proportional reversal valve, the 6e hydraulic fluid port of hydraulic control unit, the 6f hydraulic fluid port of hydraulic control unit of hydraulic control unit;
The A4 hydraulic fluid port of the first solenoid-operated proportional reversal valve is communicated with the B5 hydraulic fluid port of the second solenoid-operated proportional reversal valve, the 6j hydraulic fluid port of hydraulic control unit through the inside oil duct of hydraulic control unit, and the B4 hydraulic fluid port of the first solenoid-operated proportional reversal valve is interconnected through inside oil duct and the A5 hydraulic fluid port of the second solenoid-operated proportional reversal valve, the 6i hydraulic fluid port of hydraulic control unit of hydraulic control unit;
The A12 hydraulic fluid port of the 4th solenoid-operated proportional reversal valve is interconnected through inside oil duct and the B11 hydraulic fluid port of the 3rd solenoid-operated proportional reversal valve, the P8 oil-in of the 3rd safety valve, the T7 oil-out of the 3rd one way valve, the 6c hydraulic fluid port of hydraulic control unit of hydraulic control unit, and the B12 hydraulic fluid port of the 4th solenoid-operated proportional reversal valve is interconnected through inside oil duct and the A11 hydraulic fluid port of the 3rd solenoid-operated proportional reversal valve, the P10 hydraulic fluid port of second safety valve, the T9 oil-out of second one way valve, the 6d hydraulic fluid port of hydraulic control unit of hydraulic control unit;
The 6a hydraulic fluid port of hydraulic control unit is communicated with the oil-out of hydraulic pump through fluid pressure line; The 6b hydraulic fluid port of hydraulic control unit is communicated with the oil return opening of low pressure sealed reservoir through fluid pressure line; The 6c hydraulic fluid port of hydraulic control unit is communicated with the loculus of rotary ink tank through fluid pressure line; The 6d hydraulic fluid port of hydraulic control unit is communicated with the big chamber of rotary ink tank through fluid pressure line; The 6e hydraulic fluid port of hydraulic control unit detects mouth with the hydraulic pressure of second pressure sensor and is communicated with; The 6f hydraulic fluid port of hydraulic control unit is communicated with intermediate-pressure accumulator through fluid pressure line, and the 6g hydraulic fluid port of hydraulic control unit detects mouth with the hydraulic pressure of first pressure sensor and is communicated with, and the 6h hydraulic fluid port of hydraulic control unit is communicated with high pressure accumulator through fluid pressure line; The 6i hydraulic fluid port of hydraulic control unit is communicated with the loculus of boom cylinder through fluid pressure line, and the 6j hydraulic fluid port of hydraulic control unit is communicated with the big chamber of boom cylinder through fluid pressure line.
The oil-in of hydraulic pump is communicated with the oil-out of oil filter through fluid pressure line, and the oil-in of oil filter is communicated with the oil-out of low pressure sealed reservoir through fluid pressure line.
The present invention compared with prior art; Its advantage is: utilize high pressure accumulator and intermediate-pressure accumulator to store the excess energy of loader under running on the lower load; In swing arm decline and rotating bucket discharge process; Reclaim the potential energy of swing arm decline and rotating bucket discharging, on swing arm rising, rotating bucket, turn in the journey and collaborate to drive, improve the work operations efficient of loader by hydraulic pump and high pressure accumulator; Under swing arm decline, rotating bucket, turn in the journey and working hydraulic pressure is provided, can reduce engine consumption like this, improve the operating efficiency of loader by intermediate-pressure accumulator; In loader braking process, recovery load mechanism energy also is stored in the high pressure accumulator; When loader loading operation intermittence and forward gear deadhead operation; The hydraulic energy of the generation of Engine driven Hydraulic Pump is stored in the intermediate-pressure accumulator; And after high pressure accumulator, intermediate-pressure accumulator reach the highest accumulation of energy pressure of setting, through first solenoid operated directional valve to the hydraulic pump off-load.Can reduce the fuel oil oil consumption of loader like this, improve the operating efficiency of loader.
Description of drawings
Fig. 1 is existing loader hydraulic system figure.
Fig. 2 is the loader hydraulic system figure of the embodiment of the invention.
Among the figure: 1. first solenoid operated directional valve, 2. first one way valve, 3. second solenoid operated directional valve, the 4. first solenoid-operated proportional reversal valve, the 5. second solenoid-operated proportional reversal valve; 6. hydraulic control unit, 7. the 3rd one way valve, 8. the 3rd safety valve, 9. second one way valve, 10. second safety valve; 11. the 3rd solenoid-operated proportional reversal valve, 12. the 4th solenoid-operated proportional reversal valves, 13. the 3rd solenoid operated directional valves, 14. first safety valves; 15. boom cylinder, 16. high pressure accumulators, 17. first pressure sensors, 18. intermediate-pressure accumulators; 19. second pressure sensor, 20. rotary ink tanks, 21. low pressure sealed reservoirs, 22. oil filters; 23. hydraulic pump, 24. open type oil tanks, 25. rotating buckets join guiding valve, and 26. swing arms join guiding valve.
The specific embodiment
Describe the present invention below in conjunction with accompanying drawing and embodiment.
Fig. 1 is existing loader hydraulic system, comprises that hydraulic pump 23, boom cylinder 15, rotary ink tank 20, first safety valve 14, oil filter 22, rotating bucket manually join guiding valve 25, swing arm and manually join guiding valve 26, second one way valve 9, second safety valve 10, the 3rd one way valve 7, the 3rd safety valve 8 and open type oil tank 24.During loader work; Hydraulic pump 23 is turned round by motor driven; Manually join 20 work of guiding valve 25 control rotary ink tanks through the manipulation rotating bucket and realize that the rotating buckets shovel is expected, discharging, manually join lifting, the decline that guiding valve 26 is realized control boom cylinders 15 work realization swing arms through handling swing arm.When the loader loading operation; Lifting, the decline of rotating bucket shovel material, discharging and swing arm relies on Engine driven Hydraulic Pump running carrying out work fully; The potential energy in the swing arm decline process can not be recycled, the kinetic energy in the braking procedure of loader can not be recycled.
The loader hydraulic system of the embodiment of the invention shown in Figure 2; Comprise hydraulic pump 23, low pressure sealed reservoir 21, high pressure accumulator 16, intermediate-pressure accumulator 18, hydraulic control unit 6, boom cylinder 15, rotary ink tank 20, oil filter 23; Integrated first solenoid operated directional valve 1, second solenoid operated directional valve 3, the 3rd solenoid operated directional valve 13, the first solenoid-operated proportional reversal valve 4, the second solenoid-operated proportional reversal valve 5, the 3rd solenoid-operated proportional reversal valve 11, the 4th solenoid-operated proportional reversal valve 12, first one way valve 2, second one way valve 9, the 3rd one way valve 7, first safety valve 14, second safety valve 10, the 3rd safety valve 8, first pressure sensor 17, second pressure sensor 19 of being equipped with of hydraulic control unit 6 wherein; Hydraulic control unit 6 is provided with inner oil duct, and hydraulic control unit 6 also is provided with hydraulic fluid port 6a, hydraulic fluid port 6b, hydraulic fluid port 6c, hydraulic fluid port 6d, hydraulic fluid port 6e, hydraulic fluid port 6f, hydraulic fluid port 6g, hydraulic fluid port 6h, hydraulic fluid port 6i, the hydraulic fluid port 6j that is connected with outside oil circuit;
High pressure accumulator 16 adopts piston accumulator, and the operating pressure of high pressure accumulator 16 is 18~31.5MPa, the maximum working pressure P of high pressure accumulator 16 High max=31.5MPa, its operating pressure detects through first pressure sensor 17;
Intermediate-pressure accumulator 18 adopts bladder accumulator, and the operating pressure of intermediate-pressure accumulator 18 is 5~12MPa, the maximum working pressure P of intermediate-pressure accumulator 18 Middle max=12MPa, its operating pressure detects through second pressure sensor 19;
Low pressure sealed reservoir 21 adopts the enclosed gas charging fuel tank, and the operating pressure of low pressure sealed reservoir is 0.5~2.5MPa;
The effect of first safety valve 14 is the maximum working pressures that limit hydraulic pump, and its maximum working pressure is 31.5MPa;
The effect of second safety valve 10 is: prevent the impact of rotating bucket external load in the loading operation process, limit the maximum working pressure in rotary ink tank 20 big chambeies;
The effect of the 3rd safety valve 8 is: prevent the impact of rotating bucket external load in the loading operation process, limit the maximum working pressure of rotary ink tank 20 loculuses;
The effect of first one way valve 2 is to prevent to flow backwards to hydraulic pump 23 from the fluid of high pressure accumulator 16 and intermediate-pressure accumulator 18;
The effect of second one way valve 9 is: in the swing arm lifting process when moved arm lifting when a certain position; The piston rod of rotary ink tank 20 is outwards pulled out; The loculus pressure of rotary ink tank 20 is raise; The little cavity pressure of rotary ink tank 20 carries out pressure release through second safety valve, and the second one way valve repairing can be passed through in rotary ink tank 20 big chambeies, to eliminate the big chamber vacuum of rotary ink tank 20;
The effect of the 3rd one way valve 7 is: when rotary ink tank 20 dischargings, fast to the cavity of resorption repairing of rotary ink tank 20, the bump limited block is realized the scraper bowl discharging after scraper bowl is crossed down twisted point;
First solenoid operated directional valve 1 is the bi-bit bi-pass solenoid operated directional valve, is used for the off-load control of hydraulic pump 23;
Second solenoid operated directional valve 3 is bi-bit bi-pass solenoid operated directional valves, is used for the accumulation of energy control of high pressure accumulator 16 and the supply control of working hydraulic pressure oil;
The 3rd solenoid operated directional valve 13 is bi-bit bi-pass solenoid operated directional valves, is used for pressing the accumulation of energy control of accumulator 18;
The first solenoid-operated proportional reversal valve 4 is two-position four-way solenoid-operated proportional reversal valves, is used for the lifting control of boom cylinder 15;
The second solenoid-operated proportional reversal valve 5 is two-position four-way solenoid-operated proportional reversal valves, is used for the decline control of boom cylinder 15;
The 3rd solenoid-operated proportional reversal valve 11 is two-position four-way solenoid-operated proportional reversal valves, is used for the shovel material control of pivoted arm arm oil cylinder 20;
The 4th solenoid-operated proportional reversal valve 12 is two-position four-way solenoid-operated proportional reversal valves, is used for the discharging control of pivoted arm arm oil cylinder 20;
The P1 hydraulic fluid port of first solenoid operated directional valve 1 is interconnected through inside oil duct and the P2 oil-in of first one way valve 2, the 6a hydraulic fluid port of hydraulic control unit 6 of hydraulic control unit 6, and the T1 hydraulic fluid port of first solenoid operated directional valve 1 is interconnected through inside oil duct and the 6b hydraulic fluid port of hydraulic control unit 6, the T14 oil-out of first safety valve 14, the T12 hydraulic fluid port of the 4th solenoid-operated proportional reversal valve 12, the T4 hydraulic fluid port of the first solenoid-operated proportional reversal valve 4, the T11 hydraulic fluid port of the 3rd solenoid-operated proportional reversal valve 11, the T5 hydraulic fluid port of the second solenoid-operated proportional reversal valve 5, the T10 hydraulic fluid port of second safety valve 10, the P9 hydraulic fluid port of second one way valve 9, the T8 hydraulic fluid port of the 3rd safety valve 8, the P7 hydraulic fluid port of the 3rd one way valve 7 of hydraulic control unit 6;
The T2 hydraulic fluid port of first one way valve 2 is interconnected through inside oil duct and the P3 hydraulic fluid port of second solenoid operated directional valve 3, the P13 hydraulic fluid port of the 3rd solenoid operated directional valve 13, the P14 hydraulic fluid port of first safety valve 14 of hydraulic control unit 6;
The T3 hydraulic fluid port of second solenoid operated directional valve 3 is interconnected through inside oil duct and the P4 hydraulic fluid port of the first solenoid-operated proportional reversal valve 4, the P11 hydraulic fluid port of the 3rd solenoid-operated proportional reversal valve 11, the 6g hydraulic fluid port of hydraulic control unit 6, the 6h hydraulic fluid port of hydraulic control unit 6 of hydraulic control unit 6;
The T13 hydraulic fluid port of the 3rd solenoid operated directional valve 13 is interconnected through inside oil duct and the P12 hydraulic fluid port of the 4th solenoid-operated proportional reversal valve 12, the P5 hydraulic fluid port of the second solenoid-operated proportional reversal valve 5, the 6e hydraulic fluid port of hydraulic control unit 6, the 6f hydraulic fluid port of hydraulic control unit 6 of hydraulic control unit 6;
The A4 hydraulic fluid port of the first solenoid-operated proportional reversal valve 4 is communicated with the B5 hydraulic fluid port of the second solenoid-operated proportional reversal valve 5, the 6j hydraulic fluid port of hydraulic control unit 6 through the inside oil duct of hydraulic control unit 6, and the B4 hydraulic fluid port of the first solenoid-operated proportional reversal valve 4 is interconnected through inside oil duct and the A5 hydraulic fluid port of the second solenoid-operated proportional reversal valve 5, the 6i hydraulic fluid port of hydraulic control unit 6 of hydraulic control unit 6;
The A12 hydraulic fluid port of the 4th solenoid-operated proportional reversal valve 12 is interconnected through inside oil duct and the B11 hydraulic fluid port of the 3rd solenoid-operated proportional reversal valve 11, the P8 oil-in of the 3rd safety valve 8, the T7 oil-out of the 3rd one way valve 7, the 6c hydraulic fluid port of hydraulic control unit 6 of hydraulic control unit 6, and the B12 hydraulic fluid port of the 4th solenoid-operated proportional reversal valve 12 is interconnected through inside oil duct and the A11 hydraulic fluid port of the 3rd solenoid-operated proportional reversal valve 11, the P10 hydraulic fluid port of second safety valve 10, the T9 oil-out of second one way valve 9, the 6d hydraulic fluid port of hydraulic control unit 6 of hydraulic control unit 6;
The 6a hydraulic fluid port of hydraulic control unit 6 is communicated with the oil-out of hydraulic pump 23 through fluid pressure line; The 6b hydraulic fluid port of hydraulic control unit 6 is communicated with the oil return opening of low pressure sealed reservoir 21 through fluid pressure line; The 6c hydraulic fluid port of hydraulic control unit 6 is communicated with the loculus of rotary ink tank 20 through fluid pressure line; The 6d hydraulic fluid port of hydraulic control unit 6 is communicated with the big chamber of rotary ink tank 20 through fluid pressure line; The 6e hydraulic fluid port of hydraulic control unit 6 detects mouth with the hydraulic pressure of second pressure sensor 21 and is communicated with; The 6f hydraulic fluid port of hydraulic control unit 6 is communicated with intermediate-pressure accumulator 18, and the 6g hydraulic fluid port of hydraulic control unit 6 detects mouth with the hydraulic pressure of first pressure sensor 17 and is communicated with, and the 6h hydraulic fluid port of hydraulic control unit 6 is communicated with high pressure accumulator 16 through fluid pressure line; The 6i hydraulic fluid port of hydraulic control unit 6 is communicated with the loculus of boom cylinder 15 through fluid pressure line, and the 6j hydraulic fluid port of hydraulic control unit 6 is communicated with the big chamber of boom cylinder 15 through fluid pressure line.
The oil-in of hydraulic pump 23 is communicated with the oil-out of oil filter 22 through fluid pressure line, and the oil-in of oil filter 22 is communicated with the oil-out of low pressure sealed reservoir 21 through fluid pressure line.
The course of work of facing the loader hydraulic system of this inventive embodiments down is further described:
The course of work of moved arm lifting is: control the electromagnet energising of the first solenoid-operated proportional reversal valve 4 and the size of regulating its electrical current; After the electromagnet energising of the first solenoid-operated proportional reversal valve 4; High-pressure and hydraulic oil flows out from high pressure accumulator 16; The P4 hydraulic fluid port of the 6h hydraulic fluid port through hydraulic control unit 6, the first solenoid-operated proportional reversal valve 4, A4 hydraulic fluid port, the inside oil duct of hydraulic control unit 6, the 6j hydraulic fluid port of hydraulic control unit 6 successively; Get into boom cylinder 15 big chambeies through fluid pressure line; Make moved arm lifting, moved arm lifting speed can be regulated through the electrical current size that changes the first solenoid-operated proportional reversal valve 4, and the fluid of boom cylinder 15 loculuses is under the effect of oil cylinder piston; The 6b hydraulic fluid port of the B4 hydraulic fluid port of the 6i hydraulic fluid port through hydraulic control unit 6, the first solenoid-operated proportional reversal valve 4, T4 hydraulic fluid port, hydraulic control unit 6 gets into low pressure sealed reservoir 21 through fluid pressure line successively; Meanwhile; The electromagnet energising of second solenoid operated directional valve 3; After the electromagnet energising of second solenoid operated directional valve 3; Behind 3 P3 of one way valve 2, second solenoid operated directional valve, T3 hydraulic fluid port, with the high-pressure and hydraulic oil interflow of flowing out from high pressure accumulator 16, P4, A4 hydraulic fluid port through the first solenoid-operated proportional reversal valve 4 get into boom cylinder 15 big chambeies from the high-pressure and hydraulic oil of hydraulic pump 23; Make in the moved arm lifting process under the situation that does not increase engine load and hydraulic pump 23 rotating speeds, quicken moved arm lifting speed.
The course of work that swing arm descends is: control the electromagnet energising of the second solenoid-operated proportional reversal valve 5 and the size of regulating its electrical current; After the electromagnet energising of the second solenoid-operated proportional reversal valve 5; The middle hydraulic oil of pressing flows out from intermediate-pressure accumulator 18; 6f hydraulic fluid port, the P5 of the second solenoid-operated proportional reversal valve 5, A5 hydraulic fluid port through hydraulic control unit 6 gets into boom cylinder 15 loculuses successively; Swing arm is descended, and the size of the electromagnet electrical current that the swing arm decrease speed can be through changing the second solenoid-operated proportional reversal valve 5 is regulated, and the fluid in boom cylinder 15 big chambeies is under the effect of oil cylinder piston; After passing through the 6b hydraulic fluid port of B5 hydraulic fluid port, T5 hydraulic fluid port, hydraulic control unit 6 of 6j hydraulic fluid port, the second solenoid-operated proportional reversal valve 5 of hydraulic control unit 6 successively, get into low pressure sealed reservoir 21 through fluid pressure line; Because in swing arm decline process; The fluid in boom cylinder 15 big chambeies; Behind the B5 hydraulic fluid port and T5 hydraulic fluid port through the second solenoid-operated proportional reversal valve 5, get into low pressure sealed reservoir 21, and low pressure sealed reservoir 21 is enclosed air tanks; The blowing pressure of low pressure sealed reservoir 21 is raise, thereby can the mode of the gravitional force in the swing arm decline process with gas pressure potential energy be stored in the low pressure sealed reservoir 21.Meanwhile; 3 energisings of second solenoid operated directional valve; High-pressure and hydraulic oil from hydraulic pump 23 gets into high pressure accumulator 16 through P3, the T3 hydraulic fluid port of one way valve 2, second solenoid operated directional valve 3; The high-pressure and hydraulic oil that hydraulic pump 23 is produced is stored in the high pressure accumulator 16, to store the energy of motor and hydraulic pump.Like this, not only can the recovery of the gravitional force in the swing arm decline process be stored in the low pressure sealed reservoir 21, and can the energy in motor and hydraulic pump 23 operation process be stored in the high pressure accumulator 16.
The course of work of changeing on the rotating bucket is: control the electromagnetic valve Tie Tong electricity of the 3rd solenoid-operated proportional reversal valve 11 and the size of regulating its electrical current; Behind the electromagnetic valve Tie Tong electricity of the 3rd solenoid-operated proportional reversal valve 11; High-pressure and hydraulic oil flows out from high pressure accumulator 16; Successively through the 6h hydraulic fluid port of hydraulic control unit 6, the P11 hydraulic fluid port of the 3rd solenoid-operated proportional reversal valve 11, the big chamber that the A11 hydraulic fluid port gets into rotary ink tank 20; Making on the rotating bucket changes; The speed of changeing on the rotating bucket can be regulated through the electromagnet electrical current that changes the 3rd solenoid-operated proportional reversal valve 11, and the fluid of rotary ink tank 20 loculuses is under the effect of oil cylinder piston, and the 6b hydraulic fluid port of the B11 hydraulic fluid port of the 6c hydraulic fluid port through hydraulic control unit 6, the 3rd solenoid-operated proportional reversal valve 11, T11 hydraulic fluid port, hydraulic control unit 6 gets into low pressure sealed reservoir 21 successively; Meanwhile; Control the electromagnet energising of second solenoid operated directional valve 3; After the energising of the electromagnet of second solenoid operated directional valve 3, through one way valve 2, the P3 hydraulic fluid port of second solenoid operated directional valve 3, T3 hydraulic fluid port, get into the big chamber of rotary ink tank 20 with the high-pressure and hydraulic oil interflow of flowing out from high pressure accumulator 16 from the high-pressure and hydraulic oil of hydraulic pump 23; Make to turn over Cheng Zhongzai on the rotating bucket and do not increase under the situation of engine load, quicken rotary speed on the rotating bucket.
The course of work that rotating bucket changes down is: control the electromagnet energising of the 4th solenoid-operated proportional reversal valve 12 and the size of regulating its electrical current; After the electromagnet energising of the 4th solenoid-operated proportional reversal valve 12; The middle hydraulic oil of pressing flows out from intermediate-pressure accumulator 18; The 6c hydraulic fluid port of the P12 of the 6f hydraulic fluid port through hydraulic control unit 6, the 4th solenoid-operated proportional reversal valve 12, A12 hydraulic fluid port, hydraulic control unit 6 successively; Through the loculus of fluid pressure line entering rotary ink tank 20, making changes discharging under the rotating bucket, and the fluid in rotary ink tank 20 big chambeies is under the effect of oil cylinder piston; Get into low pressure sealed reservoir 21 behind the 6b hydraulic fluid port of the B12 hydraulic fluid port of the 6d hydraulic fluid port through hydraulic control unit 6, the 4th solenoid-operated proportional reversal valve 12, T12 hydraulic fluid port, hydraulic control unit 6 successively; Because low pressure sealed reservoir 21 is enclosed air tanks, makes the blowing pressure rising of low pressure sealed reservoir 21 in the process of under rotating bucket, changeing, thereby can the gravitional force that turn under the rotating bucket in the journey be stored in the low pressure sealed reservoir 21 with the mode of gas pressure potential energy; Meanwhile; 3 energisings of second solenoid operated directional valve; High-pressure and hydraulic oil from hydraulic pump 23 gets into high pressure accumulator 16 through P3, the T3 hydraulic fluid port of one way valve 2, second solenoid operated directional valve 3; The high-pressure and hydraulic oil that hydraulic pump 23 is produced is stored in the high pressure accumulator 18, to store the energy of motor and hydraulic pump.Like this, not only can the gravitional force recovery that turn under the rotating bucket in the journey be stored in the low pressure sealed reservoir 21, and can the energy in motor and hydraulic pump 23 operation process be stored in the high pressure accumulator 18.
The course of work of intermediate-pressure accumulator 18 accumulation of energys is: in the loader loading operation during intermittently with the forward gear deadhead operation, as the pressure of second pressure sensor, the 19 detections maximum working pressure P less than intermediate-pressure accumulator 18 Middle maxDuring=12MPa; Control the electromagnet energising of the 3rd solenoid operated directional valve 13; After the electromagnet energising of the 3rd solenoid operated directional valve 13, hydraulic oil pumps from the oil-out of hydraulic pump 23, and P13 and the T12 hydraulic fluid port through one way valve 2, the 3rd solenoid operated directional valve 13 gets into intermediate-pressure accumulator 18 successively; Make the pressure of intermediate-pressure accumulator 18 raise pressure store ability in intermediate-pressure accumulator 18.
The course of work that braking energy reclaims is: when loader is braked; Control the electromagnet energising of second solenoid operated directional valve 3; After the electromagnet energising of second solenoid operated directional valve 3, hydraulic oil pumps from the oil-out of hydraulic pump 23, through the P3 and the T3 hydraulic fluid port entering high pressure accumulator 18 of one way valve 2, second solenoid operated directional valve 3; The pressure of high pressure accumulator 18 is raise, the kinetic energy of loader is converted into air pressure potential energy is stored in the high pressure accumulator 18; Equal the maximum working pressure P of high pressure accumulator 16 when the detected pressures of first pressure sensor 17 High maxThe pressure that=the 31.5MPa and second pressure sensor 19 detect is less than the maximum working pressure P of intermediate-pressure accumulator 18 Middle maxDuring=12MPa; Control the electromagnet energising of the 3rd solenoid operated directional valve 13; After the electromagnet energising of the 3rd solenoid operated directional valve 13; Hydraulic oil flows out from the oil-out of hydraulic pump 23, gets into intermediate-pressure accumulator 18 through first one way valve 2, the P13 hydraulic fluid port of the 3rd solenoid operated directional valve 13, T13 hydraulic fluid port successively, and the part braking energy is stored in the intermediate-pressure accumulator 18.
The course of work of hydraulic pump off-load is: the maximum working pressure P that equals accumulator 16 when the detected pressures of first pressure sensor 17 High maxThe pressure that=the 31.5MPa and second pressure sensor 19 detect equals the maximum working pressure P of intermediate-pressure accumulator 18 Middle maxDuring=12MPa; Control the electromagnetic valve energising of first solenoid operated directional valve 1; The hydraulic oil that hydraulic pump 23 pumps through fluid pressure line low pressure sealed reservoir 21, makes hydraulic pump 23 off-loads through P1 hydraulic fluid port, T1 hydraulic fluid port, the oil duct of hydraulic control unit 6, the 6b hydraulic fluid port of first solenoid operated directional valve 1.
Combine accompanying drawing that embodiment of the present invention has been done detailed description above; But the present invention is not limited to above-mentioned embodiment; In the ken that affiliated technical field those of ordinary skill is possessed, can also under the prerequisite that does not break away from aim of the present invention, make various variations.

Claims (14)

1. loader hydraulic system; Comprise hydraulic pump (23), low pressure sealed reservoir (21), high pressure accumulator (16), intermediate-pressure accumulator (18), hydraulic control unit (6), boom cylinder (15), rotary ink tank (20), oil filter (22), it is characterized in that:
Integrated first one way valve (2), second one way valve (9), the 3rd one way valve (7), first safety valve (14), second safety valve (10), the 3rd safety valve (8), first pressure sensor (17), second pressure sensor (19), first solenoid operated directional valve (1), second solenoid operated directional valve (3), the 3rd solenoid operated directional valve (13), the first solenoid-operated proportional reversal valve (4), the second solenoid-operated proportional reversal valve (5), the 3rd solenoid-operated proportional reversal valve (11) and the 4th solenoid-operated proportional reversal valve (12) of being equipped with of said hydraulic control unit (6); Hydraulic control unit (6) is provided with inner oil duct, and hydraulic control unit (6) also is provided with hydraulic fluid port 6a, hydraulic fluid port 6b, hydraulic fluid port 6c, hydraulic fluid port 6d, hydraulic fluid port 6e, hydraulic fluid port 6f, hydraulic fluid port 6g, hydraulic fluid port 6h, hydraulic fluid port 6i, the hydraulic fluid port 6j that is connected with outside oil circuit;
The P1 hydraulic fluid port of said first solenoid operated directional valve (1) is interconnected through inside oil duct and the P2 oil-in of first one way valve (2), the 6a hydraulic fluid port of hydraulic control unit (6) of hydraulic control unit (6), and the T1 hydraulic fluid port of first solenoid operated directional valve (1) is interconnected through inside oil duct and the 6b hydraulic fluid port of hydraulic control unit (6), the T14 oil-out of first safety valve (14), the T12 hydraulic fluid port of the 4th solenoid-operated proportional reversal valve (12), the T4 hydraulic fluid port of the first solenoid-operated proportional reversal valve (4), the T11 hydraulic fluid port of the 3rd solenoid-operated proportional reversal valve (11), the T5 hydraulic fluid port of the second solenoid-operated proportional reversal valve (5), the T10 oil-out of second safety valve (10), the P9 oil-in of second one way valve (9), the T8 oil-out of the 3rd safety valve (8), the P7 oil-in of the 3rd one way valve (7) of hydraulic control unit (6);
The T2 oil-out of said first one way valve (2) is interconnected through inside oil duct and the P3 hydraulic fluid port of second solenoid operated directional valve (3), the P13 hydraulic fluid port of the 3rd solenoid operated directional valve (13), the P14 hydraulic fluid port of first safety valve (14) of hydraulic control unit (6);
The T3 hydraulic fluid port of said second solenoid operated directional valve (3) is interconnected through inside oil duct and the P4 hydraulic fluid port of the first solenoid-operated proportional reversal valve (4), the P11 hydraulic fluid port of the 3rd solenoid-operated proportional reversal valve (11), the 6g hydraulic fluid port of hydraulic control unit (6), the 6h hydraulic fluid port of hydraulic control unit (6) of hydraulic control unit (6);
The T13 hydraulic fluid port of said the 3rd solenoid operated directional valve (13) is interconnected through inside oil duct and the P12 hydraulic fluid port of the 4th solenoid-operated proportional reversal valve (12), the P5 hydraulic fluid port of the second solenoid-operated proportional reversal valve (5), the 6e hydraulic fluid port of hydraulic control unit (6), the 6f hydraulic fluid port of hydraulic control unit (6) of hydraulic control unit (6);
The A4 hydraulic fluid port of the said first solenoid-operated proportional reversal valve (4) is communicated with the B5 hydraulic fluid port of the second solenoid-operated proportional reversal valve (5), the 6j hydraulic fluid port of hydraulic control unit (6) through the inside oil duct of hydraulic control unit (6), and the B4 hydraulic fluid port of the first solenoid-operated proportional reversal valve (4) is interconnected through inside oil duct and the A5 hydraulic fluid port of the second solenoid-operated proportional reversal valve (5), the 6i hydraulic fluid port of hydraulic control unit (6) of hydraulic control unit (6);
The A12 hydraulic fluid port of said the 4th solenoid-operated proportional reversal valve (12) is communicated with the B11 hydraulic fluid port of the 3rd solenoid-operated proportional reversal valve (11), the P8 oil-in of the 3rd safety valve (8), the T7 oil-out of the 3rd one way valve (7), the 6c hydraulic fluid port of hydraulic control unit (6) through the inside oil duct of hydraulic control unit (6), and the B12 hydraulic fluid port of the 4th solenoid-operated proportional reversal valve (12) is interconnected through inside oil duct and the A11 hydraulic fluid port of the 3rd solenoid-operated proportional reversal valve (11), the P10 hydraulic fluid port of second safety valve (10), the T9 oil-out of second one way valve (9), the 6d hydraulic fluid port of hydraulic control unit (6) of hydraulic control unit (6);
The 6a hydraulic fluid port of said hydraulic control unit (6) is communicated with the oil-out of hydraulic pump (23) through fluid pressure line; The 6b hydraulic fluid port of hydraulic control unit (6) is communicated with the oil return opening of low pressure sealed reservoir (21) through fluid pressure line; The 6c hydraulic fluid port of hydraulic control unit (6) is communicated with the loculus of rotary ink tank (20) through fluid pressure line; The 6d hydraulic fluid port of hydraulic control unit (6) is communicated with the big chamber of rotary ink tank (20) through fluid pressure line; The 6e hydraulic fluid port of hydraulic control unit (6) detects mouth with the hydraulic pressure of second pressure sensor (21) and is communicated with; The 6f hydraulic fluid port of hydraulic control unit (6) is communicated with intermediate-pressure accumulator (18); The 6g hydraulic fluid port of hydraulic control unit (6) detects mouth with the hydraulic pressure of first pressure sensor (17) and is communicated with; The 6h hydraulic fluid port of hydraulic control unit (6) is communicated with high pressure accumulator (16) through fluid pressure line, and the 6i hydraulic fluid port of hydraulic control unit (6) is communicated with the loculus of boom cylinder (15) through fluid pressure line, and the 6j hydraulic fluid port of hydraulic control unit (6) is communicated with the big chamber of boom cylinder (15) through fluid pressure line.
2. like claim 1 described loader hydraulic system, it is characterized in that: said high pressure accumulator (16) is piston type or bladder accumulator.
3. like claim 1 described loader hydraulic system, it is characterized in that: said intermediate-pressure accumulator (18) is piston type or bladder accumulator.
4. like claim 1 described loader hydraulic system, it is characterized in that: said low pressure sealed reservoir (21) is the enclosed gas charging fuel tank.
5. like claim 1 described loader hydraulic system, it is characterized in that: said first solenoid operated directional valve (1) is the bi-bit bi-pass solenoid operated directional valve.
6. like claim 1 described loader hydraulic system, it is characterized in that: said second solenoid operated directional valve (3) is the bi-bit bi-pass solenoid operated directional valve.
7. like claim 1 described loader hydraulic system, it is characterized in that: said the 3rd solenoid operated directional valve (13) is the bi-bit bi-pass solenoid operated directional valve.
8. like claim 1 described loader hydraulic system, it is characterized in that: the said first solenoid-operated proportional reversal valve (4) is a two-position four-way solenoid-operated proportional reversal valve.
9. like claim 1 described loader hydraulic system, it is characterized in that: the said second solenoid-operated proportional reversal valve (5) is a two-position four-way solenoid-operated proportional reversal valve.
10. like claim 1 described loader hydraulic system, it is characterized in that: said the 3rd solenoid-operated proportional reversal valve (11) is a two-position four-way solenoid-operated proportional reversal valve.
11. like claim 1 described loader hydraulic system, it is characterized in that: said the 4th solenoid-operated proportional reversal valve (12) is a two-position four-way solenoid-operated proportional reversal valve.
12. like claim 1 described loader hydraulic system, it is characterized in that: the operating pressure of said high pressure accumulator (16) is 16~35MPa.
13. like claim 1 described loader hydraulic system, it is characterized in that: the operating pressure of said intermediate-pressure accumulator (18) is 4~15MPa.
14. like claim 1 described loader hydraulic system, it is characterized in that: the operating pressure of said low pressure sealed reservoir (21) is 0.5~3 MPa.
CN201210135603.3A 2012-05-04 2012-05-04 Hydraulic system for loader Expired - Fee Related CN102635144B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105178383A (en) * 2015-10-19 2015-12-23 太原理工大学 Motor-driven type independent steering system of loading machine
CN107013505A (en) * 2015-10-02 2017-08-04 林德液压两合公司 Fluid pressure type constant pressure system
CN110182610A (en) * 2019-04-29 2019-08-30 宝钢湛江钢铁有限公司 A kind of intelligence stacker-reclaimer intelligence pitching Hydraulic system and control method
CN111828411A (en) * 2020-07-24 2020-10-27 中国人民解放军陆军装甲兵学院 Hydraulic system based on two-stage energy supply and independent valve control of load port and control method

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US6434864B1 (en) * 2000-09-22 2002-08-20 Grigoriy Epshteyn Frontal loader
JP2005155230A (en) * 2003-11-27 2005-06-16 Komatsu Ltd Hydraulic circuit for suppressing traveling vibration of wheel type construction machine
CN101278130A (en) * 2005-09-30 2008-10-01 卡特彼勒公司 Hydraulic system for recovering potential energy
CN202544015U (en) * 2012-05-04 2012-11-21 山东理工大学 Hydraulic system of loader

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Publication number Priority date Publication date Assignee Title
CN1170831A (en) * 1996-07-10 1998-01-21 三星重工业株式会社 Hydraulic system for power loaders
US6434864B1 (en) * 2000-09-22 2002-08-20 Grigoriy Epshteyn Frontal loader
JP2005155230A (en) * 2003-11-27 2005-06-16 Komatsu Ltd Hydraulic circuit for suppressing traveling vibration of wheel type construction machine
CN101278130A (en) * 2005-09-30 2008-10-01 卡特彼勒公司 Hydraulic system for recovering potential energy
CN202544015U (en) * 2012-05-04 2012-11-21 山东理工大学 Hydraulic system of loader

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107013505A (en) * 2015-10-02 2017-08-04 林德液压两合公司 Fluid pressure type constant pressure system
CN107013505B (en) * 2015-10-02 2020-02-18 林德液压两合公司 Hydraulic constant pressure system
CN105178383A (en) * 2015-10-19 2015-12-23 太原理工大学 Motor-driven type independent steering system of loading machine
CN105178383B (en) * 2015-10-19 2017-08-29 太原理工大学 Load electromechanical drive independent steering system
CN110182610A (en) * 2019-04-29 2019-08-30 宝钢湛江钢铁有限公司 A kind of intelligence stacker-reclaimer intelligence pitching Hydraulic system and control method
CN110182610B (en) * 2019-04-29 2021-07-13 宝钢湛江钢铁有限公司 Intelligent pitching hydraulic system of intelligent stacker-reclaimer and control method
CN111828411A (en) * 2020-07-24 2020-10-27 中国人民解放军陆军装甲兵学院 Hydraulic system based on two-stage energy supply and independent valve control of load port and control method
CN111828411B (en) * 2020-07-24 2022-03-01 中国人民解放军陆军装甲兵学院 Hydraulic system based on two-stage energy supply and independent valve control of load port and control method

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