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Multi-flow control valve, chassis supporting leg hydraulic control system and crane

A technology of flow control valve and switching value control, which is applied in the direction of cranes, mechanical equipment, fluid pressure actuators, etc., can solve the problems of sensitivity, oil pollution, poor reliability, etc., and achieve low oil pollution sensitivity and anti-pollution The effect of strong ability and high reliability

Active Publication Date: 2014-07-23
XUZHOU HEAVY MASCH CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] There are many problems in this current solution: firstly, the proportional directional control valve a4 has high cost, poor reliability, and is sensitive to oil pollution; secondly, the load sensitive control hydraulic system is highly sensitive to load changes, The adjustment response to load changes is fast, but in practical applications, adjusting the output power too frequently may affect the working life of the machine; finally, the valve diameter control is subject to the influence of proportional reversing valve hysteresis and repeatability, etc. some imprecision

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  • Multi-flow control valve, chassis supporting leg hydraulic control system and crane
  • Multi-flow control valve, chassis supporting leg hydraulic control system and crane
  • Multi-flow control valve, chassis supporting leg hydraulic control system and crane

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Embodiment Construction

[0024] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0025] The existing proportional reversing valve is responsible for two functions in the load sensing system, one is to switch the supply oil of the actuator with different flow requirements, and the other is to control the valve diameter, so that through the proportional reversing The oil flow of the valve corresponds to the demand of the corresponding actuator. However, it has also been analyzed that the proportional directional valve itself has problems such as high cost, poor reliability, and inaccurate diameter control.

[0026] For these problems, the inventor realizes these two aspects in the multi-flow control valve through different components, so as to eliminate the problems caused by the defects of the proportional reversing valve itself. For the oil supply switching problem of different actuators, switch c...

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Abstract

The invention relates to a multi-flow control valve, a chassis supporting leg hydraulic control system and a crane. The multi-flow control valve comprises a valve body and at least one switching value control valve, the valve body comprises a valve body oil inlet and at least two valve body work oil openings corresponding to loads of different flow demands, an oil inlet of the at least one switching value control valve is communicated with the valve body oil inlet, a work oil opening of the at least one switching value control valve is communicated with the at least two valve body work oil openings of the valve body, at least two work oil channels corresponding to the loads of the different flow demands are formed, and a throttling opening with the drift diameter corresponding to the flow demands is formed in each work oil channel. Compared with an exiting control mode of a proportional directional valve, due to the fact that the flow is mainly determined by the throttling openings of the valve body, the requirement for the precision of the switching value control valve is low, cost is low, the sensitiveness of the switching value control valve to oil pollution is low, the pollution resisting capacity is high, and therefore higher reliability is achieved.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a multi-flow control valve, a chassis outrigger hydraulic control system and a crane. Background technique [0002] In the outrigger hydraulic system of the crane chassis, there are many kinds of hydraulic cylinders for the actuators. Some hydraulic cylinders with similar parameters can adopt a flow control, and some hydraulic cylinders have different flow requirements from other hydraulic cylinders, such as the pin cylinder with small flow requirements. Etc., if only adopting the switching value control of single oil pump, there will be problems. [0003] The current solution is to use a variable variable pump to connect the proportional directional valve, and use the current supplied to the proportional directional valve to adjust the flow into the load. Such as figure 1 As shown, it is a hydraulic schematic diagram of an existing solution for hydraulic control of crane c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B13/02B66C23/80
Inventor 李丽宋建军曹培雷张永亮
Owner XUZHOU HEAVY MASCH CO LTD
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