CN202545385U - Energy-saving hydraulic system for loaders - Google Patents

Energy-saving hydraulic system for loaders Download PDF

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Publication number
CN202545385U
CN202545385U CN2012201963578U CN201220196357U CN202545385U CN 202545385 U CN202545385 U CN 202545385U CN 2012201963578 U CN2012201963578 U CN 2012201963578U CN 201220196357 U CN201220196357 U CN 201220196357U CN 202545385 U CN202545385 U CN 202545385U
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China
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hydraulic
fluid port
hydraulic fluid
control unit
valve
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CN2012201963578U
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曲金玉
周英超
任传波
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Shandong University of Technology
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Shandong University of Technology
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Abstract

The utility model discloses an energy-saving hydraulic system for loaders, which comprises a hydraulic pump, a low-pressure sealed reservoir, a high-pressure energy accumulator, a medium-pressure energy accumulator and a hydraulic control unit. The hydraulic control unit is integrated with a first check valve, a second check valve, a third check valve, a first relief valve, a second relief valve, a third relief valve, a first speed control valve, a second speed control valve, a first pressure sensor, a second pressure sensor, a first electromagnetic reversing valve, a second electromagnetic reversing valve, a first electromagnetic proportional reversing valve and a second electromagnetic proportional reversing valve. The energy-saving hydraulic system utilizes the high-pressure energy accumulator and the medium-pressure energy accumulator to accumulate kinetic energy in the braking process of a loader and the residual energy of the loader under low-load condition, and the low-pressure sealed reservoir to accumulate potential energy in the declining process of a movable arm, thus achieving the purposes of reducing the fuel consumption of the loader and increasing the working efficiency of the loader.

Description

The loader energy-saving hydraulic system
Technical field
The utility model relates to a kind of hydraulic system, and more particularly, the utility model relates to a kind of loader energy-saving hydraulic system.
Background technique
Loader is widely used in construction such as mining site, capital construction, road maintenance occasion, mainly is to be main with bulk materials such as shovel charging stone, mineral.Because it is simple and convenient, can save manpower in a large number, to increase work efficiency, it is important engineering machinery that loader has become.
In the existing technology, loader hydraulic system comprises that oil hydraulic pump, boom cylinder, rotary ink tank, safety valve, oil purifier, double-action 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 gravitational potential energy 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 process 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 purpose of the utility model is to overcome above-mentioned defective, and a kind of oil consumption of loader, loader energy-saving hydraulic system of raising loading operation efficient of reducing is provided.
For solving the problems of the technologies described above, the utility model is realized 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 technological scheme is:
The loader energy-saving hydraulic system comprises oil hydraulic pump, low pressure sealed reservoir, high pressure accumulator, intermediate-pressure accumulator, hydraulic control unit, boom cylinder, rotary ink tank, oil purifier;
The low pressure sealed reservoir is the enclosed gas charging fuel tank; The working pressure of low pressure sealed reservoir is 0.5~3MPa; High pressure accumulator adopts piston type or bladder accumulator; The working pressure of high pressure accumulator is 16~35MPa, and intermediate-pressure accumulator adopts piston type or bladder accumulator, and the working pressure of intermediate-pressure accumulator is 5~15MPa.
Integrated first solenoid directional control valve, second solenoid directional control valve, the first solenoid-operated proportional selector valve, the second solenoid-operated proportional selector valve, 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 transducer and second pressure transducer 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 5a, hydraulic fluid port 5b, hydraulic fluid port 5c, hydraulic fluid port 5d, hydraulic fluid port 5e, hydraulic fluid port 5f, hydraulic fluid port 5g, hydraulic fluid port 5h, hydraulic fluid port 5i, the hydraulic fluid port 5j that is connected with outside oil circuit;
First solenoid directional control valve is the bi-bit bi-pass solenoid directional control valve, and second solenoid directional control valve is the 3-position-3-way solenoid directional control valve, and the first solenoid-operated proportional selector valve is three six energising magnetic proportional reversing valves, and the second solenoid-operated proportional selector valve is three six energising magnetic proportional reversing valves.
The P1 hydraulic fluid port of first solenoid directional control valve is interconnected through inside oil duct and the P2 filler opening of first one-way valve, the 5a hydraulic fluid port of hydraulic control unit of hydraulic control unit, and the T1 hydraulic fluid port of first solenoid directional control valve is interconnected through inside oil duct and the 5b hydraulic fluid port of hydraulic control unit, the T11 oil outlet of first safety valve, the T10 hydraulic fluid port of the second solenoid-operated proportional selector valve, the T4 hydraulic fluid port of the first solenoid-operated proportional selector valve, the T9 hydraulic fluid port of second safety valve, the P8 hydraulic fluid port of second one-way valve, the T7 hydraulic fluid port of the 3rd safety valve, the P6 hydraulic fluid port of the 3rd one-way valve of hydraulic control unit;
The T2 oil outlet of first one-way valve is interconnected through inside oil duct and the P3 hydraulic fluid port of second solenoid directional control valve, the P11 hydraulic fluid port of first safety valve of hydraulic control unit;
The A3 hydraulic fluid port of second solenoid directional control valve is interconnected through inside oil duct and the D10 hydraulic fluid port of the second solenoid-operated proportional selector valve, the D4 hydraulic fluid port of the first solenoid-operated proportional selector valve, the 5e hydraulic fluid port of hydraulic control unit, the 5f hydraulic fluid port of hydraulic control unit of hydraulic control unit, and the B3 hydraulic fluid port of second solenoid directional control valve is interconnected through inside oil duct and the P10 hydraulic fluid port of the second solenoid-operated proportional selector valve, the P4 hydraulic fluid port of the first solenoid-operated proportional selector valve, the 5g hydraulic fluid port of hydraulic control unit, the 5h hydraulic fluid port of hydraulic control unit of hydraulic control unit;
Inside oil duct and the first solenoid-operated proportional selector valve B4 hydraulic fluid port of the A4 hydraulic fluid port of the said first solenoid-operated proportional selector valve through hydraulic control unit, the 5j hydraulic fluid port of hydraulic control unit are interconnected, and the C4 hydraulic fluid port of the first solenoid-operated proportional selector valve is interconnected through the inside oil duct of hydraulic control unit and the 5i hydraulic fluid port of hydraulic control unit;
The A10 hydraulic fluid port of the said second solenoid-operated proportional selector valve is interconnected through inside oil duct and the B10 hydraulic fluid port of the second solenoid-operated proportional selector valve, the P9 oil outlet of second safety valve, the T8 filler opening of second one-way valve, the 5d hydraulic fluid port of hydraulic control unit of hydraulic control unit; The C10 hydraulic fluid port of the second solenoid-operated proportional selector valve is interconnected through inside oil duct and the P7 oil outlet of the 3rd safety valve, the T6 hydraulic fluid port of the 3rd one-way valve, the 5d hydraulic fluid port of hydraulic control unit of hydraulic control unit;
The 5a hydraulic fluid port of said hydraulic control unit is communicated with the oil outlet of oil hydraulic pump through hydraulic pipe line; The 5b hydraulic fluid port of hydraulic control unit is communicated with the return opening of low pressure sealed reservoir through hydraulic pipe line; The 5c hydraulic fluid port of hydraulic control unit is communicated with the loculus of rotary ink tank through hydraulic pipe line; The 5d hydraulic fluid port of hydraulic control unit is communicated with the big chamber of rotary ink tank through hydraulic pipe line; The 5e hydraulic fluid port of hydraulic control unit detects mouth with the hydraulic pressure of second pressure transducer and is communicated with; The 5f hydraulic fluid port of hydraulic control unit is communicated with intermediate-pressure accumulator through hydraulic pipe line, and the 5g hydraulic fluid port of hydraulic control unit detects mouth with the hydraulic pressure of first pressure transducer and is communicated with, and the 5h hydraulic fluid port of hydraulic control unit is communicated with high pressure accumulator through hydraulic pipe line; The 5i hydraulic fluid port of hydraulic control unit is communicated with the loculus of boom cylinder through hydraulic pipe line, and the 5j hydraulic fluid port of hydraulic control unit is communicated with the big chamber of boom cylinder through hydraulic pipe line;
The filler opening of oil hydraulic pump is communicated with the oil outlet of oil purifier through hydraulic pipe line, and the filler opening of oil purifier is communicated with the oil outlet of low pressure sealed reservoir through hydraulic pipe line.
The utility model 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 oil 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 working 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 Ballast; 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 directional control valve to the oil hydraulic pump off-load.Can reduce the fuel oil oil consumption of loader like this, improve the working efficiency of loader.
Description of drawings
Fig. 1 is existing loader hydraulic system figure.
Fig. 2 is the utility model embodiment's loader energy-saving hydraulic system figure
Among the figure: 1. first solenoid directional control valve, 2. first one-way valve, 3. second solenoid directional control valve, 3a. first electromagnet, 3b. second electromagnet; 4. the first solenoid-operated proportional selector valve, 4a. first electromagnet, 4b. second electromagnet, 5. hydraulic control unit, 6. the 3rd one-way valve; 7. the 3rd safety valve, 8. second one-way valve, 9. second safety valve, the 10. second solenoid-operated proportional selector valve, 10a. first electromagnet; 10b. second electromagnet, 11. first safety valves, 12. low pressure sealed reservoirs, 13. oil purifiers, 14. oil hydraulic pumps; 15. boom cylinder, 16. high pressure accumulators, 17. first pressure transducers, 18. intermediate-pressure accumulators, 19. second pressure transducers; 20. rotary ink tank, 21. open type oil tanks, 22. rotating buckets manually join guiding valve, and 23. swing arms manually join guiding valve.
Embodiment
Fig. 1 is existing loader hydraulic system, comprises that oil hydraulic pump 16, boom cylinder 15, rotary ink tank 20, first safety valve 11, oil purifier 13, rotating bucket manually join guiding valve 22, swing arm and manually join guiding valve 23, the 3rd one-way valve 6, the 3rd safety valve 7, second one-way valve 8, second safety valve 9, open type oil tank 21.During loader work; Oil hydraulic pump 16 manually joins 20 work of guiding valve 22 control rotary ink tanks by the engine-driving running through handling rotating bucket, realizes rotating bucket shovel material, discharging; Manually join 15 work of guiding valve 23 realization control boom cylinders through handling swing arm, realize lifting, the decline of swing arm.When the loader loading operation; Lifting, the decline process 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 process of loader can not be recycled.
The utility model embodiment's shown in Figure 2 loader energy-saving hydraulic system comprises oil hydraulic pump 14, low pressure sealed reservoir 12, high pressure accumulator 16, intermediate-pressure accumulator 18, boom cylinder 15, rotary ink tank 20, hydraulic control unit 5.Wherein, Hydraulic control unit 5 is integrated to be equipped with first solenoid directional control valve 1, second solenoid directional control valve 3, the first solenoid-operated proportional selector valve 4, the second solenoid-operated proportional selector valve 10, first one-way valve 2, second one-way valve 8, the 3rd one-way valve 6, first safety valve 11, second safety valve 9, the 3rd safety valve 7, first pressure transducer 17, second pressure transducer 19; Hydraulic control unit 5 is provided with inner oil duct, and hydraulic control unit 5 also is provided with hydraulic fluid port 5a, hydraulic fluid port 5b, hydraulic fluid port 5c, hydraulic fluid port 5d, hydraulic fluid port 5e, hydraulic fluid port 5f, hydraulic fluid port 5g, hydraulic fluid port 5h, hydraulic fluid port 5i, the hydraulic fluid port 5j that is connected with outside oil circuit;
Low pressure sealed reservoir 15 adopts the enclosed gas charging fuel tank, and the working pressure of low pressure sealed reservoir is 0.5~2.5Mpa;
High pressure accumulator 16 adopts piston accumulator, and the working pressure of high pressure accumulator is 18~31MPa, Maximum operating pressure P High max=31MPa, the working pressure of high pressure accumulator 16 detects through first pressure transducer 17;
Intermediate-pressure accumulator 18 adopts bladder accumulator, and the working pressure of intermediate-pressure accumulator is 5~10MPa, Maximum operating pressure P Middle max=10MPa, the working pressure of intermediate-pressure accumulator 18 detects through second pressure transducer 19;
The effect of first safety valve 2 is the Maximum operating pressures that limit oil hydraulic pump 14, and its Maximum operating pressure is 31MPa;
The effect of second safety valve 9 is: prevent the impact of rotating bucket external load in the loading operation process, limit the Maximum operating pressure in rotary ink tank 20 big chambeies;
The effect of the 3rd safety valve 7 is: prevent the impact of rotating bucket external load in the loading operation process, limit the Maximum operating pressure of rotary ink tank 20 loculuses;
The effect of first one-way valve 2 is to prevent to flow backwards to oil hydraulic pump 14 from the fluid of high pressure accumulator 16 and intermediate-pressure accumulator 18;
The effect of second one-way valve 8 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 is through 9 pressure releases of second safety valve, and 8 repairings of second one-way valve can be passed through in the big chamber of rotary ink tank 20, to eliminate the big chamber vacuum of rotary ink tank 20;
The effect of the 3rd one-way valve 6 is: when rotary ink tank 20 dischargings, fast to the cavity of resorption repairing of rotary ink tank 20, the bump limiting stopper is realized the scraper bowl discharging after scraper bowl is crossed down twisted point;
First solenoid directional control valve 1 is the bi-bit bi-pass solenoid directional control valve, is used for the off-load control of oil hydraulic pump 14;
Second solenoid directional control valve 3 is 3-position-3-way solenoid directional control valves, is used for the accumulation of energy control of high pressure accumulator 16, intermediate-pressure accumulator 18;
The first solenoid-operated proportional selector valve 4 is three six energising magnetic proportional reversing valves, is used for lifting, decline switching-over control and the lifting of boom cylinder 15 of boom cylinder 15, the Flow-rate adjustment of decline process, realizes the adjusting of moved arm lifting, rate of descent;
The second solenoid-operated proportional selector valve 10 is three six energising magnetic selector valves, is used for shovel material, discharging switching-over control and the shovel material of rotary ink tank 20 of rotary ink tank 20, the Flow-rate adjustment of discharge process, realizes the shovel material of rotating bucket, the adjusting of discharge rate;
The P1 hydraulic fluid port of first solenoid directional control valve 1 is interconnected through inside oil duct and the P2 filler opening of first one-way valve 2, the 5a hydraulic fluid port of hydraulic control unit 5 of hydraulic control unit 5, and the T1 hydraulic fluid port of first solenoid directional control valve 1 is interconnected through inside oil duct and the 5b hydraulic fluid port of hydraulic control unit 5, the T11 oil outlet of first safety valve 11, the T10 hydraulic fluid port of the second solenoid-operated proportional selector valve 10, the T4 hydraulic fluid port of the first solenoid-operated proportional selector valve 4, the T9 hydraulic fluid port of second safety valve 9, the P8 hydraulic fluid port of second one-way valve 8, the T7 hydraulic fluid port of the 3rd safety valve 7, the P6 hydraulic fluid port of the 3rd one-way valve 6 of hydraulic control unit 5;
The T2 oil outlet of first one-way valve 2 is interconnected through inside oil duct and the P3 hydraulic fluid port of second solenoid directional control valve 3, the P11 hydraulic fluid port of first safety valve 11 of hydraulic control unit 5;
The A3 hydraulic fluid port of second solenoid directional control valve 3 is interconnected through inside oil duct and the D10 hydraulic fluid port of the second solenoid-operated proportional selector valve 10, the D4 hydraulic fluid port of the first solenoid-operated proportional selector valve 4, the 5e hydraulic fluid port of hydraulic control unit 5, the 5f hydraulic fluid port of hydraulic control unit 5 of hydraulic control unit 5, and the B3 hydraulic fluid port of second solenoid directional control valve 3 is interconnected through inside oil duct and the P10 hydraulic fluid port of the second solenoid-operated proportional selector valve 10, the P4 hydraulic fluid port of the first solenoid-operated proportional selector valve 4, the 5g hydraulic fluid port of hydraulic control unit 5, the 5h hydraulic fluid port of hydraulic control unit 5 of hydraulic control unit 5;
The A4 hydraulic fluid port of the first solenoid-operated proportional selector valve 4 is communicated with the B4 hydraulic fluid port of the first solenoid-operated proportional selector valve 4, the 5j hydraulic fluid port of hydraulic control unit 5 through the inside oil duct of hydraulic control unit 5, and the C4 hydraulic fluid port of the first solenoid-operated proportional selector valve 4 is communicated with the 5i hydraulic fluid port of hydraulic control unit 5 through the inside oil duct of hydraulic control unit 5;
The A10 hydraulic fluid port of the second solenoid-operated proportional selector valve 10 is interconnected through inside oil duct and the B10 hydraulic fluid port of the second solenoid-operated proportional selector valve 10, the P9 hydraulic fluid port of second safety valve 9, the T8 hydraulic fluid port of second one-way valve 8, the 5d hydraulic fluid port of hydraulic control unit 5 of hydraulic control unit 5, and the C10 hydraulic fluid port of the second solenoid-operated proportional selector valve 10 is interconnected through inside oil duct and the P7 filler opening of the 3rd safety valve 7, the T6 hydraulic fluid port of the 3rd one-way valve 6, the 5c hydraulic fluid port of hydraulic control unit 5 of hydraulic control unit 5;
The 5a hydraulic fluid port of hydraulic control unit 5 is communicated with the oil outlet of oil hydraulic pump 14 through hydraulic pipe line; The 5b hydraulic fluid port of hydraulic control unit 5 is communicated with the return opening of low pressure sealed reservoir 12 through hydraulic pipe line; The 5c hydraulic fluid port of hydraulic control unit 5 is communicated with the loculus of rotary ink tank 20 through hydraulic pipe line; The 5d hydraulic fluid port of hydraulic control unit 5 is communicated with the big chamber of rotary ink tank 20 through hydraulic pipe line; The 5e hydraulic fluid port of hydraulic control unit 5 detects mouth with the hydraulic pressure of second pressure transducer 19 and is communicated with; The 5f hydraulic fluid port of hydraulic control unit 5 is communicated with intermediate-pressure accumulator 18 through hydraulic pipe line, and the 5g hydraulic fluid port of hydraulic control unit 5 detects mouth with the hydraulic pressure of first pressure transducer 19 and is communicated with, and the 5h hydraulic fluid port of hydraulic control unit 5 is communicated with high pressure accumulator 16 through hydraulic pipe line; The 5i hydraulic fluid port of hydraulic control unit 5 is communicated with the loculus of boom cylinder 15 through hydraulic pipe line, and the 5j hydraulic fluid port of hydraulic control unit 5 is communicated with the big chamber of boom cylinder 15 through hydraulic pipe line;
The filler opening of oil hydraulic pump 14 is communicated with the oil outlet of oil purifier 14 through hydraulic pipe line; The filler opening of oil purifier 14 is communicated with the oil outlet of low pressure sealed reservoir 15 through hydraulic pipe line, and the return opening of low pressure sealed reservoir 15 is communicated with the 5b hydraulic fluid port of hydraulic control unit 5 through hydraulic pipe line.
The working procedure of facing this model utility embodiment's loader energy-saving hydraulic system down is further described:
The working procedure of moved arm lifting is: control the first electromagnet 4a energising of the first solenoid-operated proportional selector valve and the size of regulating its electrical current; After the first electromagnet 4a energising of the first solenoid-operated proportional selector valve; Moved arm lifting speed can be through changing the first solenoid-operated proportional selector valve the electrical current size of the first electromagnet 4a regulate; High-pressure and hydraulic oil flows out from high pressure accumulator 16; The 5j hydraulic fluid port of the P4 of the 5h hydraulic fluid port through hydraulic control unit 5, the first solenoid-operated proportional selector valve 4, A4 hydraulic fluid port, hydraulic control unit 5 successively; Get into boom cylinder 15 big chambeies through hydraulic pipe line; And the fluid of boom cylinder 15 loculuses is under the effect of oil cylinder piston, and the 5b hydraulic fluid port of the C4 hydraulic fluid port of the 5i hydraulic fluid port through hydraulic control unit 5, the first solenoid-operated proportional selector valve 4, T4 hydraulic fluid port, hydraulic control unit 5 gets into low pressure sealed reservoir 12 through hydraulic pipe line successively; Meanwhile; After the first electromagnet 3a energising of second solenoid directional control valve 3; Behind 3 P3 of one-way valve 2, second solenoid directional control valve, B3 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 selector valve 4 get into boom cylinder 15 big chambeies from the high-pressure and hydraulic oil of oil hydraulic pump 14; Make in the moved arm lifting process under the situation that does not increase engine load and oil hydraulic pump 14 rotating speeds, quicken moved arm lifting speed.
The working procedure that swing arm descends is: control the second electromagnet 4b energising of the first solenoid-operated proportional selector valve and the size of regulating its electrical current; After the second electromagnet 4b energising of the first solenoid-operated proportional selector valve 4; The middle hydraulic oil of pressing flows out from intermediate-pressure accumulator 18; The D4 hydraulic fluid port of the 5f hydraulic fluid port through hydraulic control unit 5, the first solenoid-operated proportional selector valve 4, C4 hydraulic fluid port, the inside oil duct of hydraulic control unit 5, the 5i hydraulic fluid port of hydraulic control unit 5 successively; The loculus that gets into boom cylinder 15 through hydraulic pipe line descends swing arm; The speed that swing arm descends can be regulated through the second electromagnet 4b electrical current size that changes the first solenoid-operated proportional selector valve 4; And the fluid in boom cylinder 15 big chambeies is under the effect of oil cylinder piston; Get into the B4 hydraulic fluid port, T4 hydraulic fluid port, the inside oil duct of hydraulic control unit 5, the 5b hydraulic fluid port of hydraulic control unit 5 of inside oil duct, the first solenoid-operated proportional selector valve 4 of 5j hydraulic fluid port, the hydraulic control unit 5 of hydraulic control unit 5 successively through hydraulic pipe line, get into low pressure sealed reservoir 12 through hydraulic pipe line, because low pressure sealed reservoir 12 is enclosed air tanks; The inflation pressure of low pressure sealed reservoir 12 is raise, thereby can the mode of the gravitational potential energy in the swing arm decline process with gas pressure potential energy be stored in the low pressure sealed reservoir 12; Meanwhile; After the first electromagnet 3a energising of second solenoid directional control valve; Get into high pressure accumulator 16 from the high-pressure and hydraulic oil of oil hydraulic pump 14 through 3 P3, B3 hydraulic fluid port of one-way valve 2, second solenoid directional control valve; The pressure of high pressure accumulator 16 is raise, and the hydraulic energy that oil hydraulic pump 14 is produced is stored in the high pressure accumulator 16.
The working procedure of changeing on the rotating bucket: control the first electromagnet 10a energising of the second solenoid-operated proportional selector valve 10 and the size of regulating its electrical current; After the first electromagnet 10a energising of the second solenoid-operated proportional selector valve 10; High-pressure and hydraulic oil flows out from high pressure accumulator 16; P10 hydraulic fluid port, A10 hydraulic fluid port through the second solenoid-operated proportional selector valve 10 gets into rotary ink tank 20 big chambeies successively, makes to change on the rotating bucket to shovel material, and the speed of changeing on the rotating bucket can be regulated through the first electromagnet 10a electrical current size that changes the second solenoid-operated proportional selector valve 10; And the fluid of rotary ink tank 20 loculuses is under the effect of oil cylinder piston; The 5b hydraulic fluid port of the C10 hydraulic fluid port of the 5c hydraulic fluid port through hydraulic control unit 5, the second solenoid-operated proportional selector valve 10, T10 hydraulic fluid port, hydraulic control unit 5 gets into low pressure sealed reservoir 12 through hydraulic pipe line, meanwhile successively; After the first electromagnet 3a energising of second solenoid directional control valve 3; Behind the P3 of one-way valve 2, second solenoid directional control valve 3, B3 hydraulic fluid port, with the high-pressure and hydraulic oil interflow of flowing out from high pressure accumulator 16, P10 hydraulic fluid port, A10 hydraulic fluid port through the second solenoid-operated proportional selector valve 10 get into rotary ink tank 20 big chambeies from the high-pressure and hydraulic oil of oil hydraulic pump 14; Make to turn over Cheng Zhongzai on the rotating bucket and do not increase under the situation of engine load and oil hydraulic pump 14 rotating speeds, quicken to change on the rotating bucket speed of shovel material.
The working procedure that rotating bucket changes down: control the second electromagnet 10b energising of the second solenoid-operated proportional selector valve and the size of electrical current thereof; After the second electromagnet 10b energising of the second solenoid-operated proportional selector valve; The middle hydraulic oil of pressing flows out from intermediate-pressure accumulator 18; The D10 hydraulic fluid port of the 5f hydraulic fluid port through hydraulic control unit 5, the second solenoid-operated proportional selector valve 10, C10 hydraulic fluid port, the inside oil duct of hydraulic control unit 5, the 5c hydraulic fluid port of hydraulic control unit 5 successively; Get into rotary ink tank 20 loculuses through hydraulic pipe line; Make under the rotating bucket to change and carry out discharging, the energising electrical current size of the second electromagnet 10b that the speed that rotating bucket changes down can be through changing the second solenoid-operated proportional selector valve is regulated, and the fluid in rotary ink tank 20 big chambeies is under the effect of oil cylinder piston; B10 hydraulic fluid port through the second solenoid-operated proportional selector valve 10, T10 hydraulic fluid port, the inside oil duct of hydraulic control unit 5, the 5d hydraulic fluid port of hydraulic control unit 5 get into low pressure sealed reservoir 12 through hydraulic pipe line successively; Because low pressure sealed reservoir 12 is enclosed gas charging fuel tanks; The inflation pressure of low pressure sealed reservoir 12 is raise, thereby can the gravitational potential energy that turn under the rotating bucket in the journey be stored in the low pressure sealed reservoir 12 with the mode of gas pressure potential energy; Meanwhile; Control the first electromagnet 3a energising of second solenoid directional control valve; After the first electromagnet 3a energising of second solenoid directional control valve; Get into high pressure accumulator 16 from the high-pressure and hydraulic oil of oil hydraulic pump 14 through 3 P3, B3 hydraulic fluid port of one-way valve 2, second solenoid directional control valve, the pressure of high pressure accumulator 16 is raise, the hydraulic energy that oil hydraulic pump 14 is produced is stored in the high pressure accumulator 16.
The working procedure of intermediate-pressure accumulator 18 accumulation of energys is: in the loader loading operation during intermittently with the forward gear Ballast, as the pressure of second pressure transducer, the 19 detections Maximum operating pressure P less than intermediate-pressure accumulator 18 Middle maxDuring=10MPa; Control the second electromagnet 3b energising of second solenoid directional control valve; After the second electromagnet 3b of second solenoid directional control valve energising, through 3 P3 of one-way valve 2, second solenoid directional control valve, A3 hydraulic fluid port, the inside oil duct of hydraulic control unit 5, the 5f hydraulic fluid port of hydraulic control unit 5, get into intermediate-pressure accumulator 18 through hydraulic pipe line from the high-pressure and hydraulic oil of oil hydraulic pump 14; The pressure of intermediate-pressure accumulator 18 is raise, and the hydraulic energy that oil hydraulic pump 14 is produced is stored in the intermediate-pressure accumulator 18.
The working procedure that braking energy reclaims is: during the loader braking; Control the first electromagnet 3a energising of second solenoid directional control valve; After the first electromagnet 3a energising of second solenoid directional control valve; The high pressure oil that pumps from oil hydraulic pump 14 passes through the P3 hydraulic fluid port, B3 hydraulic fluid port, the inside oil duct of hydraulic control unit 5, the 5d hydraulic fluid port of hydraulic control unit 5 of one-way valve 2, second solenoid directional control valve 3 successively; Get into high pressure accumulator 16 through hydraulic pipe line, the pressure of high pressure accumulator 16 is raise, the kinetic energy of loader is converted into air pressure potential energy is stored in the high pressure accumulator 16; Equal the Maximum operating pressure P of high pressure accumulator 16 when the detected pressures of first pressure transducer 17 High maxThe pressure that=the 31MPa and second pressure transducer 19 detect is less than the Maximum operating pressure P of intermediate-pressure accumulator 18 Middle maxDuring=10MPa; Control the first electromagnet 3a outage of second solenoid directional control valve, the second electromagnet 3b energising of second solenoid directional control valve; The high pressure oil that pumps from oil hydraulic pump 14; P3 hydraulic fluid port, T3 hydraulic fluid port through first one-way valve 2, second solenoid directional control valve 3 gets into intermediate-pressure accumulator 18 successively, and the part braking energy is stored in the intermediate-pressure accumulator 18.
The working procedure of pump off-load is: the Maximum operating pressure P that equals high pressure accumulator 16 when the detected pressures of first pressure transducer 17 High maxThe pressure that=the 31MPa and second pressure transducer 19 detect equals the Maximum operating pressure P of intermediate-pressure accumulator 20 Middle maxDuring=10MPa; Control the electromagnet energising of first solenoid directional control valve 1; The hydraulic oil that pumps of the electromagnet energising back oil hydraulic pump 14 of first solenoid directional control valve 1 is through P1 hydraulic fluid port, T1 hydraulic fluid port, the inside oil duct of multichannel valve body 5, the 5b hydraulic fluid port of first solenoid directional control valve 1; Through hydraulic pipe line low pressure sealed reservoir 12, make oil hydraulic pump 14 off-loads.
Combine accompanying drawing that the mode of execution of the utility model has been done detailed description above; But the utility model is not limited to above-mentioned mode of execution; In the ken that affiliated technical field those of ordinary skill is possessed, can also under the prerequisite that does not break away from the utility model aim, make various variations.

Claims (11)

1. loader energy-saving hydraulic system; Comprise oil hydraulic pump (14), low pressure sealed reservoir (12), high pressure accumulator (16), intermediate-pressure accumulator (18), boom cylinder (15), rotary ink tank (20), oil purifier (13) and hydraulic control unit (5), it is characterized in that:
Integrated first solenoid directional control valve (1), second solenoid directional control valve (3), the first solenoid-operated proportional selector valve (4), the second solenoid-operated proportional selector valve (10), first one-way valve (2), second one-way valve (8), the 3rd one-way valve (6), first safety valve (11), second safety valve (9), the 3rd safety valve (7), first pressure transducer (17), second pressure transducer (19) of being equipped with of said hydraulic control unit (5); Hydraulic control unit (5) is provided with inner oil duct, and hydraulic control unit (5) also is provided with hydraulic fluid port 5a, hydraulic fluid port 5b, hydraulic fluid port 5c, hydraulic fluid port 5d, hydraulic fluid port 5e, hydraulic fluid port 5f, hydraulic fluid port 5g, hydraulic fluid port 5h, hydraulic fluid port 5i, the hydraulic fluid port 5j that is connected with outside oil circuit;
The P1 hydraulic fluid port of said first solenoid directional control valve (1) is interconnected through inside oil duct and the P2 filler opening of first one-way valve (2), the 5a hydraulic fluid port of hydraulic control unit (5) of hydraulic control unit (5), and the T1 hydraulic fluid port of first solenoid directional control valve (1) is interconnected through inside oil duct and the 5b hydraulic fluid port of hydraulic control unit (5), the T11 oil outlet of first safety valve (11), the T10 hydraulic fluid port of the second solenoid-operated proportional selector valve (10), the T4 hydraulic fluid port of the first solenoid-operated proportional selector valve (4), the T9 oil outlet of second safety valve (9), the P8 filler opening of second one-way valve (8), the T7 oil outlet of the 3rd safety valve (7), the P6 filler opening of the 3rd one-way valve (6) of hydraulic control unit (5);
The T2 oil outlet of said first one-way valve (2) is interconnected through inside oil duct and the P3 hydraulic fluid port of second solenoid directional control valve (3), the P11 hydraulic fluid port of first safety valve (11) of hydraulic control unit (5);
The A3 hydraulic fluid port of said second solenoid directional control valve (3) is interconnected through inside oil duct and the D10 hydraulic fluid port of the second solenoid-operated proportional selector valve (10), the D4 hydraulic fluid port of the first solenoid-operated proportional selector valve (4), the 5e hydraulic fluid port of hydraulic control unit (5), the 5f hydraulic fluid port of hydraulic control unit (5) of hydraulic control unit (5), and the B3 hydraulic fluid port of second solenoid directional control valve (3) is interconnected through inside oil duct and the P10 hydraulic fluid port of the second solenoid-operated proportional selector valve (10), the P4 hydraulic fluid port of the first solenoid-operated proportional selector valve (4), the 5g hydraulic fluid port of hydraulic control unit (5), the 5h hydraulic fluid port of hydraulic control unit (5) of hydraulic control unit (5);
The A4 hydraulic fluid port of the said first solenoid-operated proportional selector valve (4) is communicated with the 5j hydraulic fluid port of the first solenoid-operated proportional selector valve B4 hydraulic fluid port, hydraulic control unit (5) through the inside oil duct of hydraulic control unit (5), and the C4 hydraulic fluid port of the first solenoid-operated proportional selector valve (4) is interconnected through the inside oil duct of hydraulic control unit (5) and the 5i hydraulic fluid port of hydraulic control unit (5);
The A10 hydraulic fluid port of the said second solenoid-operated proportional selector valve (10) is communicated with the B10 hydraulic fluid port of the second solenoid-operated proportional selector valve (10), the P9 hydraulic fluid port of second safety valve (9), the T8 hydraulic fluid port of second one-way valve (8), the 5d hydraulic fluid port of hydraulic control unit (5) through the inside oil duct of hydraulic control unit (5); The 5c hydraulic fluid port of the T6 hydraulic fluid port of the P7 hydraulic fluid port of the C10 hydraulic fluid port of the second solenoid-operated proportional selector valve (10) and the 3rd safety valve (7), the 3rd one-way valve (6), hydraulic control unit (5) is interconnected;
The 5a hydraulic fluid port of said hydraulic control unit (5) is communicated with the oil outlet of oil hydraulic pump (14) through hydraulic pipe line; The 5b hydraulic fluid port of hydraulic control unit (5) is communicated with the return opening of low pressure sealed reservoir (12) through hydraulic pipe line; The 5c hydraulic fluid port of hydraulic control unit (5) is communicated with the loculus of rotary ink tank (20) through hydraulic pipe line; The 5d hydraulic fluid port of hydraulic control unit (5) is communicated with the big chamber of rotary ink tank (20) through hydraulic pipe line; The 5e hydraulic fluid port of hydraulic control unit (5) detects mouth with the hydraulic pressure of second pressure transducer (19) and is communicated with; The 5f hydraulic fluid port of hydraulic control unit (5) is communicated with intermediate-pressure accumulator (18) through hydraulic pipe line; The 5g hydraulic fluid port of hydraulic control unit (5) detects mouth with the hydraulic pressure of first pressure transducer (17) and is communicated with; The 5h hydraulic fluid port of hydraulic control unit (5) is communicated with high pressure accumulator (16) through hydraulic pipe line, and the 5i hydraulic fluid port of hydraulic control unit (5) is communicated with the loculus of boom cylinder (15) through hydraulic pipe line, and the 5j hydraulic fluid port of hydraulic control unit (5) is communicated with the big chamber of boom cylinder (15) through hydraulic pipe line.
2. like claim 1 described loader energy-saving hydraulic system, it is characterized in that: said low pressure sealed reservoir (12) is the enclosed gas charging fuel tank.
3. like claim 1 described loader energy-saving hydraulic system, it is characterized in that: said intermediate-pressure accumulator (18) is piston type or bladder accumulator.
4. like claim 1 described loader energy-saving hydraulic system, it is characterized in that: said high pressure accumulator (16) is piston type or bladder accumulator.
5. like claim 1 described loader energy-saving hydraulic system, it is characterized in that: said first solenoid directional control valve (1) is the bi-bit bi-pass solenoid directional control valve.
6. like claim 1 described loader energy-saving hydraulic system, it is characterized in that: said second solenoid directional control valve (3) is the 3-position-3-way solenoid directional control valve.
7. like claim 1 described loader energy-saving hydraulic system, it is characterized in that: the said first solenoid-operated proportional selector valve (4) is three six energising magnetic proportional reversing valves.
8. like claim 1 described loader energy-saving hydraulic system, it is characterized in that: the said second solenoid-operated proportional selector valve (10) is three six energising magnetic proportional reversing valves.
9. like claim 1 described loader energy-saving hydraulic system, it is characterized in that: the working pressure of said high pressure accumulator (16) is 16~35MPa.
10. like claim 1 described loader energy-saving hydraulic system, it is characterized in that: the working pressure of said intermediate-pressure accumulator (18) is 5~15MPa.
11. like claim 1 described loader energy-saving hydraulic system, it is characterized in that: the working pressure of said low pressure sealed reservoir (12) is 0.5~3.0MPa.
CN2012201963578U 2012-05-04 2012-05-04 Energy-saving hydraulic system for loaders Expired - Fee Related CN202545385U (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN202545385U true CN202545385U (en) 2012-11-21

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102635579A (en) * 2012-05-04 2012-08-15 山东理工大学 Energy-saving hydraulic system for loaders
CN104596856A (en) * 2015-01-16 2015-05-06 重庆大学 Uniaxial tension compression system
CN104614247A (en) * 2015-01-16 2015-05-13 重庆大学 Visualized triaxial test system
CN105626610A (en) * 2016-03-21 2016-06-01 山东理工大学 Energy-saving system of mechanical arm of energy-saving bagging machine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102635579A (en) * 2012-05-04 2012-08-15 山东理工大学 Energy-saving hydraulic system for loaders
CN102635579B (en) * 2012-05-04 2014-07-16 山东理工大学 Energy-saving hydraulic system for loaders
CN104596856A (en) * 2015-01-16 2015-05-06 重庆大学 Uniaxial tension compression system
CN104614247A (en) * 2015-01-16 2015-05-13 重庆大学 Visualized triaxial test system
CN104596856B (en) * 2015-01-16 2017-01-25 重庆大学 Uniaxial tension compression system
CN104614247B (en) * 2015-01-16 2017-02-01 重庆大学 Visualized triaxial test system
CN105626610A (en) * 2016-03-21 2016-06-01 山东理工大学 Energy-saving system of mechanical arm of energy-saving bagging machine

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