CN205530438U - No spill losses loader hydraulic system - Google Patents

Abstract

The utility model discloses a loader hydraulic system of no spill losses installs parts such as energy storage ware, switching -over valve, sensor, controller additional on the original hydraulic system's of loader basis to carry out some simplification, through corresponding control strategy, can realize quantitative pumping over outflow and load (outer load and energy storage ware) demand flow phase -match, avoid the spill losses totally, reduce throttling loss and linear loss, retrieve potential energy and be used for to the steering gear energy supply, change many pump hydraulic system of loader into single pump hydraulic system, through energy storage ware stored energy, reduce the improvement that hydraulic system built pressure time and engine installed power, realization loader overall efficiency. Utilize the energy storage ware to absorb the compression shock, improved the fatigue life of hydraulic system's stability, reliability and component.

Description

Loader hydraulic system without spill losses

Technical field

This utility model relates to technical field of engineering machinery, particularly to a kind of loader without spill losses Energy-saving hydraulic system.

Background technology

Loader is a kind of widely used engineering machinery, and hydraulic system is the ingredient that it is important, one As be made up of hydraulic system of working and steering hydraulic system.In middle-size and small-size loader, hydraulic system of working Typically use dosing pump, easily cause pump and do not mate with loading demand flow, spill losses occurs, causes Fuel economy declines and oil temperature raises.The commonly used variable pump of large-duty loader hydraulic system of working, cost High and hydraulic part sensitive to pollution.Steering hydraulic system is for ensureing to remain in the case of engine idle The most entirely turn to, improve production efficiency, typically select huge discharge dosing pump, but high at electromotor Substantial amounts of power loss can be produced during speed.

The power-saving technology that product mainly uses at present has Dual-pump flow-converging technology and Dual-pump flow-converging equivalence off-load skill Art, but the most thoroughly solve flooding problems, so energy-saving effect is very limited.Komatsu is at it Applying interflow technology in loading machine steering flow system flow amplifying valve, but technical difficulty is big, cost is high, Cannot large-scale promotion.Although variable pump technology can reduce power loss, but owing to it involves great expense, It is difficult at present popularize.

The utility model proposes a kind of energy-saving hydraulic system, by Constant Pump System is improved, just Spill losses can be avoided completely, reduce restriction loss and linear loss, it is achieved identical with variable pump systems Energy-saving effect, avoids high cost simultaneously.

Summary of the invention

The purpose of this utility model is to provide a kind of loader hydraulic system without spill losses.

System described in the utility model by electromotor, power transmission shaft, filter, fuel tank, dosing pump, three Four-way change-over valve, two-bit triplet reversal valve, accumulator, steering gear, limiting steering valve, flux amplification valve, Steering cylinder, relief valve, sensor, check valve, double-acting safety valve, banked direction control valves, rotary ink tank, Boom cylinder, controller.Described accumulator includes high pressure accumulator 8, low pressure accumulator 10 and turns to storage Can device 20；Described limiting steering valve includes left steering limit valve 15 and right turn limit valve 16；Described flow Amplifying valve includes or gate shuttle valve 14, the first three position four-way directional control valve 19 second relief valve 28；Described biography Sensor includes the first pressure transducer the 9, second pressure transducer the 11, the 3rd pressure transducer 21 and rotating speed Sensor 17；Described banked direction control valves includes three six-way transfer valves 1 and four position and four-way reversing valves 2；Described double Effect relief valve includes rod chamber double-acting safety valve 6 and rodless cavity double-acting safety valve 7；Described relief valve Including the first relief valve the 23, second relief valve the 28, the 3rd relief valve 29 and the 4th relief valve 36；Described Filter includes the first filter the 32, second filter the 34, the 3rd filter 35 and the 4th filter 37. Described electromotor 26 is coupled with dosing pump 24 by power transmission shaft 25；Described dosing pump 24 oil-in is through Tow filtrator 34 is connected with fuel tank 33, and oil-out divides two-way, a road and the second three position four-way directional control valve 27 P mouth be connected, another road is connected with the first relief valve 23；First relief valve 23 oil-out filters through the 3rd Device 35 is connected with fuel tank 33；Second three position four-way directional control valve 27 oil-out A is divided into three tunnels, a road and three P, P1 mouth of position six-way transfer valve 1 is connected, and a road is connected with high pressure accumulator 8, separately leads up to the Three relief valve 29 are connected with fuel tank 33 through the first filter 32, and oil-out B divide two-way, a road and the The P mouth of one three position four-way directional control valve 19 is connected, and a road is connected with turning to accumulator 20, T mouth and first The P mouth of two-bit triplet reversal valve 22 is connected.The A mouth of the first two-bit triplet reversal valve 22 divides two-way, and one Road is connected with steering gear 18 oil-in, and a road is connected with low pressure accumulator 10；B mouth is through the 3rd filter 35 are connected with fuel tank 33.Steering gear 18 oil-out L is through left steering limit valve 15 and the first 3-position 4-way Reversal valve 19 controls end and is connected, and oil-out R commutates through right turn limit valve 16 and the first 3-position 4-way Valve 19 controls end and is connected.The A mouth of the first three position four-way directional control valve 19 and the rodless cavity of left steering oil cylinder 12 It is connected with the rod chamber of right turn oil cylinder 13；The rod chamber of B mouth and left steering oil cylinder 12 and right turn oil cylinder The rodless cavity of 13 is connected.Or two input ports of gate shuttle valve 14 and the first three position four-way directional control valve 19 A, B mouth is connected, and delivery outlet is connected with fuel tank 33 through the 3rd filter 35 by the second relief valve 28. The A mouth of three six-way transfer valves 1 and the P mouth of four position and four-way reversing valves 2 are connected, and A1 mouth divides two-way, and one Road is connected with rotary ink tank 3 rod chamber, leads up to rod chamber double-acting safety valve 6 through the second two three Logical reversal valve 31 is connected with fuel tank 33, and B mouth divides two-way, and a road is connected with rotary ink tank 3 rodless cavity, Separately lead up to rodless cavity double-acting safety valve 7 via the second two-bit triplet reversal valve 31 and fuel tank 33 phase Even.The P mouth of four position and four-way reversing valves 2 and the A mouth of three six-way transfer valves 1 are connected, T mouth and second The P mouth of two-bit triplet reversal valve 31 is connected, and A mouth is connected with the rod chamber of boom cylinder 4, and B mouth is with dynamic The rodless cavity of arm oil cylinder 4 is connected.The P mouth of the second two-bit triplet reversal valve 31 commutates with three clematis stem respectively The T mouth of valve 1, four position and four-way reversing valve 2, rod chamber double-acting safety valve 6, rodless cavity double acting safety The outlet of valve 7 is connected, and A mouth is connected with fuel tank 33 via the first filter 32, and B mouth passes through check valve 30 are connected with low pressure accumulator 10.The signal input part of controller 5 respectively with three six-way transfer valves 1, The control crank of four position and four-way reversing valves 2, first pressure transducer the 9, second pressure transducer 11, Three pressure transducers 21 are connected with the signal output part of speed probe 17.The outfan of controller 5 divides Not with the first two-bit triplet reversal valve the 22, second three position four-way directional control valve 27 and the second two-bit triplet reversal valve The signal input part of 31 is connected.Pressure transducer 9,11 and 21 respectively by fluid pressure line and accumulator 8, 10 are connected with 20.

Compared with prior art the beneficial effects of the utility model are:

1, this utility model achieves and makes pump in the case of less to the transformation of original loader hydraulic system Output flow matches with load (including live load and accumulator) demand volume, it is to avoid overflow damage Lose the energy resource consumption caused, improve overall efficiency.

2, this utility model achieves the single pump of employing and drives whole hydraulic system, compared with original multiple pump Reduce restriction loss and linear loss, improve fuel economy.

3, this utility model achieves and makes Constant Pump System and variable pump systems have identical energy-saving effect. Native system have employed contamination resistance dosing pump stronger, lower-cost, reduces manufacturing cost and maintenance Cost.Simultaneously by accumulator Absorbing hydraulic pulsation, improve the stability of hydraulic system, reliability and The component fatigue life-span.Compared with the load-sensitive sexual system using variable pump, native system is permissible by controlling Realize identical energy-saving effect.

4, this utility model uses the low pressure accumulator that energy density is higher to reclaim swing arm decline potential energy, is used for Drive steering mechanism, further increase capacity usage ratio.

5, this utility model stores energy by accumulator, reduces electromotor installed power, improves whole Machine economy.

6, in this utility model hydraulic system due to the existence of accumulator, reduce hydraulic pressure system construction in a systematic way pressure time Between, improve the work efficiency of complete machine.

Accompanying drawing explanation

Fig. 1 is structure of the present utility model composition and operation principle schematic diagram

Fig. 2 is assemble mode logic chart

Fig. 3 is for turning to mode logic figure

Fig. 4 is for turning to accumulator discrimination model logic chart

Fig. 5 is mode of operation logic chart

Fig. 6 is idling mode logic chart

Detailed description of the invention

Referring to Fig. 1, for embodiment of the present utility model, described system is by electromotor, power transmission shaft, filtration Device, fuel tank, dosing pump, three position four-way directional control valve, two-bit triplet reversal valve, accumulator, steering gear, Limiting steering valve, flux amplification valve, steering cylinder, relief valve, sensor, check valve, double acting peace Full valve, banked direction control valves, rotary ink tank, boom cylinder, controller composition.Described accumulator includes that high pressure stores Can device 8, low pressure accumulator 10 and turn to accumulator 20；Described limiting steering valve includes left steering limit valve 15 and right turn limit valve 16；Described flux amplification valve includes the first three position four-way directional control valve 19, or gate Shuttle valve 14 and the second relief valve 28；Described sensor includes first pressure transducer the 9, second pressure sensing Device the 11, the 3rd pressure transducer 21 and speed probe 17；Described banked direction control valves includes three clematis stem commutations Valve 1 and four position and four-way reversing valves 2；Described double-acting safety valve includes rod chamber double-acting safety valve 6 and nothing Bar chamber double-acting safety valve 7；Described relief valve includes first relief valve the 23, second relief valve the 28, the 3rd Relief valve 29 and the 4th relief valve 36；Described filter include first filter the 32, second filter 34, 3rd filter 35 and the 4th filter 37.

Work process of the present utility model and principle are as follows:

Owing to system comprises hydraulic system of working and steering hydraulic system, and according to actual operating conditions, Loader should preferentially ensure that steering normally works in the course of the work, so dosing pump 24 should be excellent First pass through the second three position four-way directional control valve 27 to turning to accumulator 20 energy supply, secondly to high pressure accumulator 8 Energy supply.For ensureing the normal work of hydraulic system, high pressure accumulator 8, low pressure accumulator 10 and turn to storage The most all can should possess the energy driving correspondence system one circulation of work by device 20.Low pressure stores Can the main energy sources of device 10 be that the swing arm reclaimed declines potential energy, thus only work in steering gear 18 and When the pressure of low pressure accumulator 10 is less than lower limit, dosing pump 24 is just to low pressure accumulator 10 energy supply.Control Model, by turning to pattern, mode of operation and idling mode to constitute, turns to and has subpattern to turn to accumulation of energy under pattern Device discrimination model.First pass through assemble mode prioritizing selection during loader work and turn to pattern, mode of operation time It, idling mode is last；Then select corresponding pattern to be controlled, be related again between Three models, Again carry out model selection by assemble mode after Three models traversal, move in circles, it is ensured that loader is just Often work.Detailed process is as follows:

Turn to pattern

1, left steering operating mode:

In course of normal operation, there is steering situation in loader.Driver makes by handling steering gear 18 First three position four-way directional control valve 19 is operated in right position, now left steering oil cylinder 12 rod chamber, right turn oil Cylinder 13 rodless cavity oil-feed, loader left steering.In the process, controller 5 is by the first pressure sensing Device the 9, second pressure transducer 11 and the 3rd pressure transducer 21 detect high pressure accumulator 8, low pressure accumulation of energy Device 10 and the pressure turning to accumulator 20, calculate its pressure change rate, then drive the first two-bit triplet Reversal valve the 22, second three position four-way directional control valve 27 works, and makes flow and the load (live load of dosing pump With accumulator) demand volume matches, it is to avoid spill losses.Specific implementation process is as follows:

Controller 5 detects steering gear 18 rate signal by speed probe 17, it determines for steering situation. By the detection pressure of low pressure accumulator 10 and calculate its rate of change, and then according to change rate forecast its next The force value in moment:

(1) low pressure accumulator 10 force value and forecast pressure value thereof are above lower limit, then go detection to turn To force value and the rate of change thereof of accumulator 20, it determines whether it be enough to drive turns to.

(2) both low pressure accumulator 10 force value and forecast pressure value thereof have one to be less than low pressure limit value, Then illustrate that it cannot ensure steering gear 18 fuel feeding, so judging whether steering gear 18 rotating speed is 0, if turned Not being 0 to device 18 rotating speed, preferential steering gear 18 fuel feeding that ensures, the most now controller drives the two or three four Logical reversal valve 27 is operated in middle position, and the first two-bit triplet reversal valve 22 works left position；If steering gear 18 Rotating speed is 0, owing to the main energy sources of low pressure accumulator 10 is the potential energy that swing arm declines, so quantitatively Pump 24 does not fill energy to it, now goes to detect force value and the rate of change thereof turning to accumulator 20, it determines Whether it be enough to drive turns to.

In the case of preferentially meeting steering gear 18 fuel feeding, controller 5 turns to accumulator 20 by detection Force value, forecast pressure value and pressure change rate, drive the first two-bit triplet reversal valve the 22, the 2nd 3 Position and four-way reversing valve 27 works, and has a situations below:

(1) turning to the force value of accumulator 20, forecast pressure value to be above lower limit, its pressure changes The rate of change lower limit that rate is corresponding also above corresponding steering gear 18 rotating speed, illustrates now to turn to accumulator 20 Self-energy be enough to drive and turns to.Then the operation of three six-way transfer valves 1, four position and four-way reversing valve 2 is judged Whether handle angle is 0, if being 0, illustrates that equipment is failure to actuate, then the first two-bit triplet commutation Valve the 22, second three position four-way directional control valve 27 is all failure to actuate, and controller 5 enters subsequent cycle and judges；If Having an operation handle angle is not 0, then explanation equipment action, and control program enters mode of operation and carries out Differentiate.

(2) turning in the force value of accumulator 20, forecast pressure value and pressure change rate has a value to be less than Its lower limit, then illustrate that it is possessed energy and is not enough to driving and turns to, and carries out turning to accumulator discrimination model: Then the second three position four-way directional control valve 27 is operated in right position, and the first two-bit triplet reversal valve 22 is operated in right position, Dosing pump 24 collaborates with turning to accumulator 20.And when the second three position four-way directional control valve 27 is operated in right position, In the case of turning to and being not fully complete, if low pressure accumulator 10 meets the fuel feeding demand of steering gear 18, Two three position four-way directional control valves 27 always work at right position, until pressure reaches on it in turning to accumulator 20 Limit value；If low pressure accumulator 10 is unsatisfactory for the fuel feeding demand of steering gear 18 fuel feeding, the second 3-position 4-way Reversal valve 27 is operated in middle position, and the first two-bit triplet reversal valve 22 is operated in left position.Turned to In the case of, if equipment is failure to actuate or high pressure accumulator 8 still be enough to drive during equipment action Work system, the second three position four-way directional control valve 27 always works at right position, until in turning to accumulator 20 Pressure reaches its higher limit, and then the second three position four-way directional control valve 27 is operated in middle position, the first two-bit triplet Reversal valve 22 is operated in right position, dosing pump 24 off-load, carries out subsequent cycle model selection；If high pressure Accumulator 8 is not enough to drive work system, is operated pattern discrimination.

2, right turn operating mode:

With reference to left steering operating mode, now driver makes R mouth oil extraction by handling steering gear 18, L mouth oil return, The first three position four-way directional control valve 19 is made to be operated in left position, now right turn oil cylinder 13 rod chamber, left steering Oil cylinder 12 rodless cavity oil-feed, loader is turned right.Specific works process is with reference to left steering operating mode.

Mode of operation:

3, equipment working condition:

Working device of loader working condition includes that loading shovel inserts material operating mode, receipts bucket operating mode, moves Arm lifting operating mode, discharging operating mode, unloaded receipts bucket operating mode, swing arm decline potential energy and reclaim operating mode.Loader work Making in device work process, in the case of preferential guarantee turns to, controller 5 detects high pressure accumulator 8 Self-energy the most enough drives equipment, if enough, then carries out turning to accumulator discrimination model；As Really high pressure accumulator 8 self-energy is not enough to drive equipment, then the second three position four-way directional control valve 27 works In left position, the first two-bit triplet reversal valve 22 is operated in right position, and dosing pump 24 is with high pressure accumulator 8 altogether It is all hydraulic system of working energy supply.When the second three position four-way directional control valve 27 is operated in left position, if steering system System energy supply is not enough, then carry out turning to pattern discrimination；If steering energy supply is sufficient, then dosing pump 24 is with high Pressure accumulator 8 the most jointly for work system energy supply until the pressure of high pressure accumulator 8 reaches its higher limit, Then carry out turning to accumulator discrimination model.

Owing to inserting material operating mode, receiving bucket operating mode, moved arm lifting operating mode, discharging operating mode, unloaded receipts bucket work It is similar that condition controls logic, the most only to receive bucket operating mode and swing arm decline recovery potential energy operating mode as embodiment.

One, bucket operating mode is received

Three six-way transfer valves 1 of pilot control are operated in right position, rotary ink tank 3 rodless cavity oil-feed, have Bar chamber is fuel-displaced, and rotary ink tank 3 drives scraper bowl to turn over.In this operating mode, scraper bowl by self gravitation, The gravity of material, material are to the resistance of bucket motions and all reach maximum, now equipment hydraulic pressure system System is operated in high-pressure low-flow state.Controller 5 is by detecting the operation handle of three six-way transfer valves 1 Angle, high pressure accumulator 8, low pressure accumulator 10, turns to the pressure of accumulator 20；Calculate high-voltage energy-storage Device 8, low pressure accumulator 10, turn to the pressure change rate of accumulator 20, then drive the second 3-position 4-way Reversal valve 27 and the first two-bit triplet reversal valve 22 work, and make dosing pump 24 output flow and loading demand Flows match, it is to avoid overflow.Specific works process is as follows:

(1) in high pressure accumulator 8, force value and forecast pressure value are all higher than its lower limit, pressure change rate More than the rate of change lower limit under respective operations handle angle, then explanation high pressure accumulator 8 self-energy be enough to Driving equipment, equipment is operated alone by high pressure accumulator 8, and controller 5 carries out turning to accumulation of energy Device discrimination model.

(2) high pressure accumulator 8 force value, forecast pressure value and pressure change rate have a value less than its lower limit Value, then explanation high pressure accumulator 8 self-energy is not enough to drive equipment, and controller 5 drives the two or three Position and four-way reversing valve 27 is operated in left position, and the first two-bit triplet reversal valve 22 is operated in right position, dosing pump 24 with high pressure accumulator 8 be hydraulic system of working energy supply jointly.And when the second three position four-way directional control valve 27 work Make in left position, when the first two-bit triplet reversal valve 22 is operated in right position, if steering does not works, second Three position four-way directional control valve 27 always works at left position, and the first two-bit triplet reversal valve 22 always works at the right side Position, until high pressure accumulator 8 pressure reaches higher limit, then carries out turning to accumulator discrimination model；If Steering works, it determines steering is the need of energy supply, if steering needs energy supply, carries out Turning to pattern discrimination, preferential guarantee turns to, if steering need not energy supply, the second 3-position 4-way changes Always working at left position to valve 27, the first two-bit triplet reversal valve 22 always works at right position, until high Pressure accumulator 8 pressure reaches higher limit, then carries out turning to accumulator discrimination model.Above control model Moving in circles, completing until receiving bucket.

Two, swing arm declines recovery potential energy operating mode

Pilot control four position and four-way reversing valve 2 is operated in left 1, boom cylinder 4 rod chamber oil-feed without Bar chamber is fuel-displaced, and swing arm steadily drops to initial position, and under this operating mode, hydraulic system is in the big flow of underloading State.Controller 5 by detect the operation handle angle of four position and four-way reversing valves 2 and high pressure accumulator 8, Low pressure accumulator 10, turn to the pressure of accumulator 20, calculate high pressure accumulator 8, low pressure accumulator 10, Turn to the pressure change rate of accumulator 20, then drive the second three position four-way directional control valve 27 and the first two Three-way diverter valve the 22, second two-bit triplet reversal valve 31 works, it is achieved swing arm rapid decrease carries out energy simultaneously Amount reclaims, and the energy of recovery is for steering gear 18 energy supply.Specific implementation process is as follows:

(1) in high pressure accumulator 8, force value and forecast pressure value are all higher than its lower limit, pressure change rate More than the rate of change lower limit under respective operations handle angle, then explanation high pressure accumulator 8 self-energy be enough to Driving equipment, equipment is operated alone by high pressure accumulator 8.Controller 5 is by the second pressure Sensor 11 detects the force value of low pressure accumulator 10, if the force value of low pressure accumulator 10 is less than it Higher limit, the second two-bit triplet reversal valve 31 is operated in right position, and low pressure accumulator 10 reclaims swing arm and declines Potential energy, until low pressure accumulator 10 pressure reaches its higher limit, the second two-bit triplet reversal valve 31 works In left position；If the force value of low pressure accumulator 10 is not less than its higher limit, the second two-bit triplet reversal valve 31 are operated in left position, do not reclaim swing arm and decline potential energy；Controller 5 carries out turning to accumulator discrimination model.

(2) high pressure accumulator 8 force value, forecast pressure value and pressure change rate have a value less than its lower limit Value, then explanation high pressure accumulator 8 self-energy is not enough to drive equipment, and controller 5 drives the two or three Position and four-way reversing valve 27 is operated in left position, and the first two-bit triplet reversal valve 22 is operated in right position, dosing pump 24 be hydraulic system of working energy supply with high pressure accumulator 8 jointly, now for avoiding the input work of dosing pump 24 Rate increases, and does not carry out movable arm potential energy recovery, and the second two-bit triplet reversal valve 31 is operated in left position.And when the Two three position four-way directional control valves 27 are operated in left position, when the first two-bit triplet reversal valve 22 is operated in right position, If steering does not works, the second three position four-way directional control valve 27 always works at left position, the first two-bit triplet Reversal valve 22 always works at right position, until high pressure accumulator 8 pressure reaches higher limit, carries out turning to storage Can device discrimination model；If steering works, it determines steering is the need of energy supply, if steering system System needs energy supply then to carry out turning to pattern discrimination, and preferential guarantee turns to, if steering need not energy supply Then the second three position four-way directional control valve 27 always works at left position, the first two-bit triplet reversal valve 22 work always Make in right position, until high pressure accumulator 8 pressure reaches higher limit, carry out turning to accumulator discrimination model. Above control model moves in circles, until swing arm has declined.

Idling mode:

4, idling operation

Loader hydraulic system existence neither turns to the operating mode that the most do not works, and now controller 5 carries out idling mould Formula differentiates: if turning to accumulator 20 pressure less than its higher limit, carry out turning to accumulator discrimination model. If turning to accumulator 20 pressure to be not less than its higher limit, then judge whether high pressure accumulator 8 pressure is less than Its higher limit: if high pressure accumulator 8 pressure is less than its higher limit, the second three position four-way directional control valve 27 works In left position, the first two-bit triplet reversal valve 22 is operated in right position, and dosing pump 24 fills to high pressure accumulator 8 Can, detect steering in the process, whether work system works, if any system work, then Carry out corresponding pattern to differentiate, if steering, work system do not work, then the two or three Four-way change-over valve 27 always works at left position, and the first two-bit triplet reversal valve 22 works always in right position, Until high pressure accumulator 8 pressure reaches its higher limit, the second three position four-way directional control valve 27 is operated in middle position, First two-bit triplet reversal valve 22 is operated in right position, then carries out assemble mode judgement；If high pressure accumulator 8 Pressure is not less than its higher limit, and the second three position four-way directional control valve 27 is operated in middle position, and the first two-bit triplet changes It is operated in right position to valve 22, then carries out assemble mode judgement.

Claims (3)

1. one kind without spill losses loader hydraulic system, it is characterized in that: include electromotor, power transmission shaft, filter, fuel tank, dosing pump, three position four-way directional control valve, two-bit triplet reversal valve, accumulator, steering gear, limiting steering valve, flux amplification valve, steering cylinder, relief valve, sensor, check valve, double-acting safety valve, banked direction control valves, rotary ink tank, boom cylinder, controller；Described accumulator includes high pressure accumulator (8), low pressure accumulator (10) and turns to accumulator (20)；Described limiting steering valve includes left steering limit valve (15) and right turn limit valve (16)；Described flux amplification valve includes or gate shuttle valve (14), the first three position four-way directional control valve (19) and the second relief valve (28)；Described sensor includes the first pressure transducer (9), the second pressure transducer (11), the 3rd pressure transducer (21) and speed probe (17)；Described banked direction control valves includes three six-way transfer valves (1) and four position and four-way reversing valves (2)；Described double-acting safety valve includes rod chamber double-acting safety valve (6) and rodless cavity double-acting safety valve (7)；Described relief valve includes the first relief valve (23), the second relief valve (28), the 3rd relief valve (29) and the 4th relief valve (36)；Described filter includes the first filter (32), the second filter (34), the 3rd filter (35) and the 4th filter (37)；Electromotor (26) is coupled with dosing pump (24) by power transmission shaft (25)；Dosing pump (24) oil-in is connected with fuel tank (33) through the second filter (34), oil-out divides two-way, one tunnel is connected with the P mouth of the second three position four-way directional control valve (27), and another road is connected with the first relief valve (23)；First relief valve (23) oil-out is connected with fuel tank (33) through the 3rd filter (35)；Second three position four-way directional control valve (27) oil-out A is divided into three tunnels, one tunnel is connected with P, P1 mouth of three six-way transfer valves (1), one tunnel is connected with high pressure accumulator (8), the 3rd relief valve (29) of separately leading up to is connected with fuel tank (33) through the first filter (32), oil-out B divide two-way, one tunnel is connected with the P mouth of the first three position four-way directional control valve (19), one tunnel is connected with turning to accumulator (20), and the P mouth of T mouth and the first two-bit triplet reversal valve (22) is connected；The A mouth of the first two-bit triplet reversal valve (22) divides two-way, and a road is connected with steering gear (18) oil-in, and a road is connected with low pressure accumulator (10)；B mouth is connected with fuel tank (33) through the 3rd filter (35)；Steering gear (18) oil-out L controls end through left steering limit valve (15) with the first three position four-way directional control valve (19) and is connected, and oil-out R controls end through right turn limit valve (16) with the first three position four-way directional control valve (19) and is connected；The A mouth of the first three position four-way directional control valve (19) is connected with the rodless cavity of left steering oil cylinder (12) and the rod chamber of right turn oil cylinder (13)；B mouth is connected with the rod chamber of left steering oil cylinder (12) and the rodless cavity of right turn oil cylinder (13)；Or two input ports of gate shuttle valve (14) are connected with A, B mouth of the first three position four-way directional control valve (19), delivery outlet is connected with fuel tank (33) through the 3rd filter (35) by the second relief valve (28)；The A mouth of three six-way transfer valves (1) and the P mouth of four position and four-way reversing valves (2) are connected, the A1 mouth of three six-way transfer valves (1) divides two-way, one tunnel is connected with rotary ink tank (3) rod chamber, rod chamber double-acting safety valve (6) of leading up to is connected with fuel tank (33) through the second two-bit triplet reversal valve (31), B mouth divides two-way, one tunnel is connected with rotary ink tank (3) rodless cavity, and rodless cavity double-acting safety valve (7) of separately leading up to is connected with fuel tank (33) via the second two-bit triplet reversal valve (31)；The P mouth of four position and four-way reversing valves (2) and the A mouth of three six-way transfer valves (1) are connected, the P mouth of T mouth and the second two-bit triplet reversal valve (31) is connected, A mouth is connected with the rod chamber of boom cylinder (4), and B mouth is connected with the rodless cavity of boom cylinder (4)；The P mouth of the second two-bit triplet reversal valve (31) respectively with three six-way transfer valves (1), the T mouth of four position and four-way reversing valves (2), rod chamber double-acting safety valve (6), the outlet of rodless cavity double-acting safety valve (7) are connected, A mouth is connected with fuel tank (33) via the first filter (32), and B mouth is connected with low pressure accumulator (10) by check valve (30)；The signal input part of controller (5) respectively with three six-way transfer valves (1), the control crank of four position and four-way reversing valves (2), the first pressure transducer (9), the second pressure transducer (11), the 3rd pressure transducer (21) are connected with the signal output part of speed probe (17)；The outfan of controller (5) signal input part with the first two-bit triplet reversal valve (22), the second three position four-way directional control valve (27) and the second two-bit triplet reversal valve (31) respectively is connected；First pressure transducer (9), the second pressure transducer (11) and the 3rd pressure transducer (21) are respectively by fluid pressure line and high pressure accumulator (8), low pressure accumulator (10) with turn to accumulator (20) to be connected；

The second three position four-way directional control valve (27), high pressure accumulator (8) is installed additional between banked direction control valves and dosing pump (24)；Install additional between the first three position four-way directional control valve (19) and the second three position four-way directional control valve (27) and turn to accumulator (20)；In hydraulic system oil return oil circuit, install the second two-bit triplet reversal valve (31) and low pressure accumulator (10) additional, and low pressure accumulator (10) is connected with steering gear (18) oil-in；The first two-bit triplet reversal valve (22) is installed additional between the second three position four-way directional control valve (27) oil return opening and fuel tank (33)；The A mouth of the first two-bit triplet reversal valve (22) is connected with the oil-in of steering gear (18), and B mouth is connected with fuel tank (33) by the 3rd filter (35)；Controller (5) three six-way transfer valves (1) of detection and the operation handle angle of four position and four-way reversing valves (2), and by the first pressure transducer (9), second pressure transducer (11), 3rd pressure transducer (21) and speed probe (17) detect the pressure of high pressure accumulator (8) respectively, the pressure of low pressure accumulator (10), turn to pressure and the rotating speed of steering gear (18) of accumulator (20), then the first two-bit triplet reversal valve (22) is driven by corresponding control strategy, second three position four-way directional control valve (27) and the work of the second two-bit triplet reversal valve (31)；Realize dosing pump (24) and drive the normally work of rotary ink tank (3), boom cylinder (4), left steering oil cylinder (12) and right turn oil cylinder (13) and without spill losses, and reduce restriction loss.

It is the most according to claim 1 a kind of without spill losses loader hydraulic system, it is characterised in that: the high pressure accumulator (8) in loader hydraulic system can be operated alone and also can jointly drive rotary ink tank (3) and boom cylinder (4) with dosing pump (24) interflow；Turn to accumulator (20) to be operated alone and also common with dosing pump (24) interflow can drive left steering oil cylinder (12) and right turn oil cylinder (13)；Low pressure accumulator (10) can individually also can collaborate common to steering gear (18) fuel feeding with dosing pump (24) to steering gear (18) fuel feeding, and low pressure accumulator (10) can also be used for reclaiming potential energy.

The most according to claim 1 a kind of without spill losses loader hydraulic system, it is characterised in that: three six-way transfer valves (1), four position and four-way reversing valves (2), steering gears (18) all without in position oil return function.