CN101858368A - Multiple directional control valve system for return oil throttle control with load sensitive pressure compensation - Google Patents

Multiple directional control valve system for return oil throttle control with load sensitive pressure compensation Download PDF

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Publication number
CN101858368A
CN101858368A CN 201010180155 CN201010180155A CN101858368A CN 101858368 A CN101858368 A CN 101858368A CN 201010180155 CN201010180155 CN 201010180155 CN 201010180155 A CN201010180155 A CN 201010180155A CN 101858368 A CN101858368 A CN 101858368A
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valve
pressure
communicated
load
oil cylinder
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CN101858368B (en
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王振华
于良振
张喜全
王天雷
张春光
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Shandong Taifeng intelligent control Limited by Share Ltd
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SHANDONG TAIFENG HYDRAULIC EQUIPMENT CO Ltd
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Abstract

The invention relates to a multiple directional control valve system for return oil throttle control with load sensitive pressure compensation, in particular to a multiple directional control valve system apparatus for the return oil throttle control with load sensitive pressure compensation for excavators. In the system, a filter is communicated with a throttle valve communicated with a pressure reducing valve, the pressure reducing valve is communicated with a load sensor port, two ends of the control valve are respectively connected with a control port (6) or control port (13), the load sensor port is communicated with a one-way valve communicated with a pressure compensator, and the pressure compensator is communicated with the control valve. The outlet of a load sensitive variable pump is respectively communicated with a flow control valve, a pressure stop valve, a power adjusting valve and a variable oil cylinder, the flow control valve is communicated with the variable oil cylinder and the load sensor port, and the variable oil cylinder and a rod cavity of the variable oil cylinder are respectively connected with a swash plate of the load sensitive variable pump. The invention has the advantages of simple structure, improved accuracy of operation, high control degree and reliability and is widely used for hydraulic multiple-way valve systems of the engineering machinery industry.

Description

Multiple directional control valve system for return oil throttle control with load sensitive pressure compensation
Technical field:
The present invention relates to a kind of multiple directional control valve system for return oil throttle control with load sensitive pressure compensation, particularly at multiple directional control valve system for return oil throttle control with load sensitive pressure compensation equipment to excavator.
Background technique:
At present, mostly the assignment of traffic of open type hydraulic system control is the oil-feed of executive component is controlled, i.e. in addition throttling control and pressure compensation between executive component and delivery side of pump.Germany BOSCH-REXROTH company with the irrelevant assignment of traffic multi-way valve system of pressure and flow be comparatively advanced at present flow distributing system, even under the situation of undercurrent amount, can accomplish with load irrelevant.But all there is a problem in all oil-feed control valves: under the effect of reverse load (driving direction that is final controlling element is identical with the load action direction), though compensator can accurately be controlled fuel supply flow rate, but under the situation that Fill valve is opened, the speed of final controlling element can exceed the control expected value, thereby the accuracy of influence operation, use equilibrium valve or uncompensated throttling is carried out in oil return, Fill valve is not opened, but this can cause the extra pressure loss and cost to increase.
Summary of the invention:
Purpose of the present invention, provide a kind of multiple directional control valve system for return oil throttle control with load sensitive pressure compensation, it is to adopt the oil return of final controlling element is controlled, and carry out load pressure compensation, overcome in the prior art and can not accurately control, pressure loss rate height, complex structure, the factor that cost is more high, realization accurately control and carry out the purpose of load pressure compensation to the oil return of final controlling element.
Multiple directional control valve system for return oil throttle control with load sensitive pressure compensation of the present invention takes following technological scheme to realize: it is by the load-sensitive variable displacement pump, flow control valve, pressure shut-off valve, the power adjustments valve, the variable oil cylinder, swash plate, system's relief valve, guide's unloading valve, reduction valve, selector valve, one-way valve, pressure compensator, overload valve, filter, throttle valve and control mouthful composition, pump hydraulic fluid port and system's relief valve, guide's unloading valve, one-way valve, filter is communicated with, system's relief valve, guide's unloading valve, selector valve, overload valve is communicated with return opening, filter is communicated with throttle valve, throttle valve is communicated with reduction valve, reduction valve is communicated with the load-transducing mouth, one-way valve is communicated with selector valve, selector valve is communicated with overload valve and oil cylinder, the selector valve two ends connect control mouth or control mouth respectively, the load-transducing mouth is communicated with one-way valve, one-way valve is communicated with pressure compensator, and pressure compensator is communicated with selector valve.Load-sensitive variable delivery side of pump is communicated with flow control valve, pressure shut-off valve, power adjustments valve, variable oil cylinder respectively, flow control valve is communicated with the variable oil cylinder, flow control valve is communicated with the load-transducing mouth, and the rod chamber of variable oil cylinder and variable oil cylinder is connected with the swash plate of load-sensitive variable displacement pump respectively.
Oil hydraulic pump is that a load sensing pump is made up of Variable plunger pump and stroking mechanism; The pump stroking mechanism mainly is made up of flow control valve, pressure shut-off valve, constant power control valve, variable oil cylinder and variable oil cylinder; The variable oil cylinder is adjusted the flow of pump by changing pump swash plate pivot angle, and when the oil pressure that acts on the variable oil cylinder is high more, the swash plate pivot angle is more little, and pump duty output is also just few more.Constant power control valve is in right position under the spring force effect, variable oil cylinder working-pressure oil is by the constant power control valve oil return, and oil pump is swung to big direction of the traffic under oil pressure and the spring action in variable oil cylinder chamber.Pressure fuel pump oil acts on the push rod by variable oil cylinder chamber, push rod promotes lever makes lever around a spot wobble, the promotion constant power control valve moves right, make constant power control valve be in position, a left side, pressure fuel pump oil by constant power control valve through pressure shut-off valve entering variable oil cylinder, promote its piston rod, overcome upper cylinder hydraulic coupling and pressure spring oil pump is swung to the small flow direction.Simultaneously because variable oil cylinder piston bar moves to right, and the arm of force that push rod promotes lever reduces, the power that makes lever push away constant power control valve descends, and until equating that with the constant power control valve spring force oil pump pivot angle is in new equilibrium position, thereby realizes that permanent power controls.
When actuators such as multi-way valve manipulation swing arm, dipper, scraper bowl, soil-shifting; be the maximum locking pressure of restriction oil hydraulic cylinder under blocking; at each overload valve in parallel of two oil ports that connect actuator; set its maximum overload power; if surpass this pressure; overload valve is opened, and unloads, and has protected hydraulic element and pipeline to avoid damaging.Power shovel is when excavating; swing arm is inevitable stressed; in order to safeguard proper functioning; though the swing arm oil hydraulic cylinder is located and " off position ", must there be enough big blocking force to resist to stretch and compresses, this locking pressure is sometimes well beyond the maximum service pressure of system; when this locking pressure during greater than the overload valve set pressure; overload valve is opened, and working oil pressure release oil return is protected other hydraulic element and pipeline.
Multi-way valve mainly contains three function control valves: be respectively system's main safety valve, guide's unloading valve and load-sensitive compensatory pressure oil sources valve; System's relief valve is the Maximum operating pressure of control multi-way valve system, and guide's unloading valve is the guide's unloading valve that has pilot stage, and pilot stage is subjected to compensatory pressure and guide's spring contrast control, and main valve is subjected to pressure fuel pump and spring action.Selector valve is when meta, and each sheet reverse valve oil head is obstructed, and this moment, the load-sensitive compensatory pressure can affact the pilot stage of guide's unloading valve, guide's unloading valve was opened, the off-load of load-sensitive variable displacement pump pressure; During selector valve work, the load-sensitive compensatory pressure can pass through selector valve oil return off-load, the pilot valve of guide's unloading valve can not opened, and the control oil pressure that acts on guide's unloading valve spring one end can not pressure release, so guide's unloading valve is in closed condition under the effect of pressure fuel pump and spring.Each sheet of multi-way valve is when meta, load-sensitive variable displacement pump output services flow is by guide's unloading valve pressure release oil return, load-sensitive variable displacement pump output flow is very big, this moment, multi-way valve was at meta, each restriction is obstructed, and the load-sensitive compensatory pressure raises, and feeds back to the flow control valve of load-sensitive variable displacement pump, the force value that the load-sensitive compensatory pressure is set greater than the load-sensitive variable displacement pump is an oil return pressure reduction, so load-sensitive variable displacement pump flow reduces.When working if any any a slice selector valve, load-sensitive compensatory pressure oil can be through pressure compensator one-way valve pressure release oil return, load-sensitive compensatory pressure oil pressure reduces, feed back to the flow control valve of load-sensitive variable displacement pump, its load-sensitive variable displacement pump output flow can be adjusted thereupon, in the time of selector valve stroke maximum, load-sensitive compensatory pressure oil is hardly through the direct pressure release oil return of throttling, this moment, load-sensitive compensatory pressure pressure was roughly zero, load-sensitive variable displacement pump output flow maximum, the load-sensitive variable displacement pump carries out Variable Control under permanent power control curve.The effect of load-sensitive compensatory pressure: as the stroking mechanism of feedback pressure signal feedback effect in the load-sensitive variable displacement pump, make load-sensitive variable displacement pump output flow adapt to multi-way valve spool aperture needs all the time, there is not unnecessary flow to run off, to realize load-sensitive control; Act on the control oil channel of pressure compensator, to realize pressure compensated flow control.
The effect of multiple directional control valve system for return oil throttle control with load sensitive pressure compensation of the present invention is simple in structure, improve the accuracy of operation, control degree and reliability height can be realized the soft control stably of hydraulic system full power, are widely used on the hydraulic multichannel valve system of construction machinery industry.
Description of drawings:
Multiple directional control valve system for return oil throttle control with load sensitive pressure compensation of the present invention will describe in further detail in conjunction with the accompanying drawings.
Accompanying drawing is multiple directional control valve system for return oil throttle control with load sensitive pressure compensation hydraulic control figure of the present invention.
1---load-reacting pump 2---load-transducing mouth 3---system's overflow valve 4---leader unload valve 5---compensatory pressure oil sources valve 6---control mouthfuls 7---reversal valve 8---check valve 9---oil cylinder 10---pressure compensator 11---overload valve 12---overload valve 13---control mouthfuls 14---check valve 15---filter 16---flow speed control valve 17---oil return opening 18------flow control valve 20---pressure shut-off valve 21---power adjusting valve 22---variable oil cylinder 23---swash plate 24---variable oil cylinder that pumps hydraulic fluid port 19
Embodiment:
With reference to accompanying drawing, multiple directional control valve system for return oil throttle control with load sensitive pressure compensation of the present invention, it is by load-sensitive variable displacement pump 1, flow control valve 19, pressure shut-off valve 20, power adjustments valve 21, variable oil cylinder 22, variable oil cylinder 24, swash plate 23, system's relief valve 3, guide's unloading valve 4, reduction valve 5, selector valve 7, one-way valve 8, one-way valve 14, compensator 10, overload valve 11, overload valve 12, filter 15, throttle valve 16 and control mouth 6, control mouthful 13 compositions, pump hydraulic fluid port 18 and system's relief valve 3, guide's unloading valve 4, one-way valve 14, filter 15 is communicated with, system's relief valve 3, pilot operated compound relief valve 4, selector valve 7, overload valve 11, overload valve 12 is communicated with return opening 17, filter 15 is communicated with throttle valve 16, throttle valve 16 is communicated with reduction valve 5, reduction valve 5 is communicated with load-transducing 2, one-way valve 14 is communicated with selector valve 7, selector valve 7 is communicated with overload valve 11 and oil cylinder 9, selector valve 7 is communicated with overload valve 12 and oil cylinder 9, pump control mouthfuls 2 is communicated with one-way valve 8, one-way valve 8 is communicated with pressure compensator 10, and pressure compensator 10 is communicated with selector valve 7.The outlet of load-sensitive variable displacement pump 1 is communicated with flow control valve 19, pressure shut-off valve 20, power adjustments valve 21, variable oil cylinder 22 respectively, flow control valve 19 is communicated with variable oil cylinder 24, flow control valve 19 is communicated with load-transducing mouth 2, and the rod chamber of variable oil cylinder 22 and variable oil cylinder 24 is connected with the swash plate 23 of load-sensitive variable displacement pump 1 respectively.
Load-sensitive variable displacement pump 1 working principle: oil hydraulic pump is that a load sensing pump is made up of Variable plunger pump and stroking mechanism.The pump stroking mechanism mainly is made up of flow control valve 19, pressure shut-off valve 20, constant power control valve 21, variable oil cylinder 22 and variable oil cylinder 24.The variable oil cylinder is adjusted the flow of pump by changing pump swash plate 23 pivot angles, and when the oil pressure that acts on the variable oil cylinder is high more, swash plate 23 pivot angles are more little, and pump duty output is also just few more.Constant power control valve 21 is in right position under the spring force effect, variable oil cylinder 24 pressure oils are by constant power control valve 21 oil returns, and oil pump is swung to big direction of the traffic under oil pressure and the spring action in variable oil cylinder 22 chambeies.Pressure fuel pump oil acts on the push rod by variable oil cylinder 22 chambeies, push rod promotes lever makes lever around a spot wobble, promoting constant power control valve 21 moves right, make constant power control valve 21 be in position, a left side, pressure fuel pump oil passes through constant power control valve 21 through pressure shut-off valve 20 entering variable oil cylinders 24, promote its piston rod, overcome upper cylinder hydraulic coupling and pressure spring oil pump is swung to the small flow direction.Simultaneously because variable oil cylinder 22 piston rods move to right, and the arm of force that push rod promotes lever reduces, the power that makes lever push away constant power control valve 21 descends, and until equating that with constant power control valve 21 spring forces the oil pump pivot angle is in new equilibrium position, thereby realizes that permanent power controls.
The effect of overload valve 11 and overload valve 12: when actuators such as multi-way valve manipulation swing arm, dipper, scraper bowl, soil-shifting; be the maximum locking pressure of restriction oil hydraulic cylinder under blocking; at two oil ports that connect actuator each overload valve 11 in parallel or overload valve 12; set its maximum overload power; if surpass this pressure; overload valve 11 and overload valve 12 are opened, and unload, and have protected hydraulic element and pipeline to avoid damaging.Power shovel is when excavating; swing arm is inevitable stressed; in order to safeguard proper functioning; though the swing arm oil hydraulic cylinder is located and " off position ", must there be enough big blocking force to resist to stretch and compresses, this locking pressure is sometimes well beyond the maximum service pressure of system; when this locking pressure during greater than the overload valve set pressure; overload valve is opened, and working oil pressure release oil return is protected other hydraulic element and pipeline.
The multi-way valve working principle: it is respectively system's main safety valve 3, guide's unloading valve 4 and load-sensitive compensatory pressure oil sources valve 5 that multi-way valve mainly contains three function control valves.The Maximum operating pressure of system's relief valve 3 control multi-way valve systems.Guide's unloading valve 4 is the guide's unloading valves 4 that have pilot stage, and pilot stage is subjected to compensatory pressure and guide's spring contrast control, and main valve is subjected to pressure fuel pump and spring action.When selector valve 7 during at meta, each sheet reverse valve oil head is obstructed, and this moment, the load-sensitive compensatory pressure can affact the pilot stage of guide's unloading valve 4, guide's unloading valve 4 was opened, the 1 pressure off-load of load-sensitive variable displacement pump.When any selector valve 7 is worked, the load-sensitive compensatory pressure can pass through selector valve 7 oil return off-loads, the pilot valve of guide's unloading valve 4 can not opened, the control oil pressure that acts on guide's unloading valve 4 springs one end can not pressure release, so guide's unloading valve 4 is in closed condition under the effect of pressure fuel pump and spring.Each sheet of multi-way valve is when meta, load-sensitive variable displacement pump 1 output services flow is by the 4 pressure release oil returns of guide's unloading valve, load-sensitive variable displacement pump 1 output flow is very big, this moment, multi-way valve was at meta, each restriction is obstructed, and the load-sensitive compensatory pressure raises, and feeds back to the flow control valve 19 of load-sensitive variable displacement pump 1, the force value (oil return pressure reduction) that the load-sensitive compensatory pressure is set greater than load-sensitive variable displacement pump 1 is so load-sensitive variable displacement pump 1 flow reduces.When working if any any a slice selector valve 7, load-sensitive compensatory pressure oil can be through pressure compensator 10 one-way valve pressure release oil returns, load-sensitive compensatory pressure oil pressure reduces, feed back to load-sensitive variable displacement pump 1 flow control valve 19, its load-sensitive variable displacement pump 1 output flow can be adjusted thereupon, in the time of selector valve 7 stroke maximums, load-sensitive compensatory pressure oil is hardly through the direct pressure release oil return of throttling, this moment, load-sensitive compensatory pressure pressure was roughly zero, load-sensitive variable displacement pump 1 output flow maximum, load-sensitive variable displacement pump 1 carries out Variable Control under permanent power control curve.The effect of load-sensitive compensatory pressure: as the stroking mechanism of feedback pressure signal feedback effect in load-sensitive variable displacement pump 1, make load-sensitive variable displacement pump 1 output flow adapt to multi-way valve spool aperture needs all the time, there is not unnecessary flow to run off, to realize load-sensitive control; Act on the control oil channel of pressure compensator 10, to realize pressure compensated flow control.
The embodiment of multiple directional control valve system for return oil throttle control with load sensitive pressure compensation of the present invention, pressure compensator 10 flow controls: selector valve 7 oil circuits are provided with pressure compensator 10, when selector valve 7 monolithics are worked, pressure compensator 10 works independently, the load-sensitive compensatory pressure is adjusted POF only as the induced pressure feedback signal.When multiple working (is example with any two actuators), if load F1 is greater than load F2, beginning induced pressure P1 is less than pressure P 2, a load-sensitive compensatory pressure part and spring are controlled each pressure compensator 10 1 ends together, another part acts on pressure compensator 10 the other ends or passes through valve rod meter out mouth pressure release oil return by the one-way valve of pressure compensator 10, so the load-sensitive compensatory pressure is taken from the minimum of each sheet selector valve 7 induced pressure, the inlet pressure compensation device 10 of starting working all is in normally open, after induced pressure P1 and induced pressure P2 are by pressure compensator 10, become induced pressure Pm1 and induced pressure Pm2, and Pm1 is less than Pm2, and act on pressure compensator 10 1 ends, the pressure compensator 10 of second selector valve can carry out throttling to induced pressure P2 under the effect of induced pressure Pm2, thereby induced pressure Pm2 is reduced until equating with induced pressure Pm1.
ΔP1=Pm1-PT
ΔP2=Pm2-PT=Pm1-PT=ΔP1
Q1=K×A1×ΔP1 m
Q2=K×A2×ΔP2 m
Δ P1: the oil return pressure reduction of load F1; Δ P2: the oil return pressure reduction of load F1; PT: return pressure
So Q1/Q2=A1/A2
Flow is according to spool oil return aperture size flow rate distribution, and irrelevant with load.

Claims (2)

1. multiple directional control valve system for return oil throttle control with load sensitive pressure compensation, it is by load-sensitive variable displacement pump (1), flow control valve (19), pressure shut-off valve (20), power adjustments valve (21), variable oil cylinder (22), variable oil cylinder (24), swash plate (23), system's relief valve (3), guide's unloading valve (4), reduction valve (5), selector valve (7), one-way valve (8), one-way valve (14), compensator (10), overload valve (11), overload valve (12), filter (15), throttle valve (16) and control mouthful (6), control mouthful (13) is formed, it is characterized in that pumping hydraulic fluid port (18) and system's relief valve (3), guide's unloading valve (4), one-way valve (14), filter (15) is communicated with, system's relief valve (3), pilot operated compound relief valve (4), selector valve (7), overload valve (11), overload valve (12) is communicated with return opening (17), filter (15) is communicated with throttle valve (16), throttle valve (16) is communicated with reduction valve (5), reduction valve (5) is communicated with load-transducing (2), one-way valve (14) is communicated with selector valve (7), selector valve (7) is communicated with overload valve (11) and oil cylinder (9), selector valve (7) is communicated with overload valve (12) and oil cylinder (9), pump control mouthful (2) is communicated with one-way valve (8), one-way valve (8) is communicated with pressure compensator (10), and pressure compensator (10) is communicated with selector valve (7); The outlet of load-sensitive variable displacement pump (1) is communicated with flow control valve (19), pressure shut-off valve (20), power adjustments valve (21), variable oil cylinder (22) respectively, flow control valve (19) is communicated with variable oil cylinder (24), flow control valve (19) is communicated with load-transducing mouth (2), and the rod chamber of variable oil cylinder (22) and variable oil cylinder (24) is connected with the swash plate (23) of load-sensitive variable displacement pump (1) respectively.
2. multiple directional control valve system for return oil throttle control with load sensitive pressure compensation according to claim 1 is characterized in that oil hydraulic pump is that a load sensing pump is made up of Variable plunger pump and stroking mechanism; The pump stroking mechanism mainly is made up of flow control valve (19), pressure shut-off valve (20), constant power control valve (21), variable oil cylinder (22) and variable oil cylinder (24); The variable oil cylinder is adjusted the flow of pump by changing pump swash plate (23) pivot angle, and the oil pressure that acts on the variable oil cylinder is high more, and swash plate (23) pivot angle is more little, and pump duty output is also just few more; Constant power control valve (21) is in right position under the spring force effect, variable oil cylinder (24) pressure oil is by constant power control valve (21) oil return, and oil pump is swung to big direction of the traffic under oil pressure and the spring action in variable oil cylinder (22) chamber; Pressure fuel pump oil acts on the push rod by variable oil cylinder (22) chamber, push rod promotes lever makes lever around a spot wobble, promoting constant power control valve (21) moves right, make constant power control valve (21) be in position, a left side, pressure fuel pump oil passes through constant power control valve (21) through pressure shut-off valve (20) entering variable oil cylinder (24), promote its piston rod, overcome upper cylinder hydraulic coupling and pressure spring oil pump is swung to the small flow direction; Move to right owing to variable oil cylinder (22) piston rod simultaneously, the arm of force that push rod promotes lever reduces, and the power that makes lever push away constant power control valve (21) descends, until equating with constant power control valve (21) spring force, the oil pump pivot angle is in new equilibrium position, thereby realizes permanent power control.
CN 201010180155 2010-05-13 2010-05-13 Multiple directional control valve system for return oil throttle control with load sensitive pressure compensation Active CN101858368B (en)

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