Multiple directional control valve system for return oil throttle control with load sensitive pressure compensation
A multi-way reversing valve and load-sensing technology, which is applied in the direction of fluid pressure actuators, servo motor components, mechanical equipment, etc., can solve the problems of inaccurate control, high pressure loss rate, complex structure, etc., and achieve the degree of control and High reliability, soft and stable full power, and the effect of improving accuracy
Active Publication Date: 2013-06-05
SHANDONG TAIFENG INTELLIGENT CONTROL CO LTD
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Problems solved by technology
[0003] The purpose of the present invention is to provide a load-sensitive pressure compensation oil return throttling control multi-way reversing valve system, which uses the control of the oil return of the actuator and load pressure compensation to overcome the inaccurate Control, high pressure loss rate, complex structure, high cost and other factors, to achieve the purpose of precise control of the oil return of the actuator and load pressure compensation
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[0012] Referring to the accompanying drawings, the load-sensing pressure compensation throttle control multi-way reversing valve system of the present invention is composed of a load-sensing variable pump 1 provided with a load sensing port 2 and a pump oil outlet 18, a flow control valve 19, Pressure cut-off valve 20, power regulating valve 21, first variable cylinder 22, second variable cylinder 24, swash plate 23, system relief valve 3, pilot unloading valve 4, pressure reducing valve 5, reversing valve 7, first One-way valve 8, executive working cylinder 9, second one-way valve 14, pressure compensator 10, first overload valve 11, second overload valve 12, filter 15, throttle valve 16 and first control port 6, second Composed of two control ports 13, the pump oil outlet 18 communicates with the system relief valve 3, the pilot unloading valve 4, the second check valve 14, and the filter 15, the system relief valve 3, the pilot unloading valve 4, and the reversing valve The...
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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 first control port or second control port, 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 rod cavities of the first and second 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
technical field [0001] The invention relates to a load-sensitive pressure-compensated oil-return throttling control multi-way reversing valve system, in particular to the load-sensitive pressure-compensated oil-return throttling control multi-way reversing valve system equipment for an excavator. Background technique [0002] At present, the flow distribution control of the open hydraulic system mostly controls the oil inlet of the actuator, that is, throttling control and pressure compensation are added between the actuator and the outlet of the pump. Germany Rexroth's pressure- and flow-independent flow distribution multi-way valve system is a relatively advanced flow distribution system at present, even in the case of insufficient flow, it can be independent of load. But there is a problem with all oil inlet control valves: under the action of reverse load (that is, the driving direction of the actuator is the same as that of the load), although the compensator can accura...
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IPC IPC(8): F15B13/02
Inventor 王振华于良振张喜全王天雷张春光
Owner SHANDONG TAIFENG INTELLIGENT CONTROL CO LTD
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