Composite linkage multi-way valve of open center system and hydraulic control method

Abstract

The invention relates to the field of hydraulic pressure, in particular to a composite linkage multi-way valve of an open center system. The composite linkage multi-way valve comprises a main valve body, a bridge type oil passage is arranged in the main valve body, an annular groove is formed in the surface of the outer circle of a valve rod, and the bridge type oil passage communicates with an oil return cavity of a previous link and a neutral oil passage of a next link. During single-link work, an oil port A of a multi-way valve working cavity supplies oil to an execution element, and an oilport B enters the neutral oil passage of the next link through the bridge type passage to return oil. During multi-link work, an oil inlet system reaches the oil port A1 of the multi-way valve working cavity through the oil inlet passage of the previous link, enters the next link through the bridge type passage of the link, reaches an oil port A2 of the multi-way valve working cavity through theoil inlet passage of the next link and supplies the oil to an execution element II, and an oil port B2 enters the neutral oil passage of the next link through the bridge type passage of the link to return the oil. The multi-way valve is simple in structure, few in fault and easy and convenient to maintain; and according to a control method, composite linkage is achieved, operation is easy, returnoil of the previous linkage can be recycled, the energy-saving effect is good, and the system efficiency is high.

Description

technical field [0001] The invention relates to the field of hydraulic technology, in particular to a compound linkage multi-way valve of an open center system and a hydraulic control method. Background technique [0002] The traditional open-center hydraulic system adopts a three-position six-way multi-way valve. In the neutral position, the pressure oil of the oil pump passes through the neutral oil passage and finally returns to the fuel tank; when the actuator operates, the valve port leading to the oil return from the neutral oil passage is gradually closed. , the valve port leading from the neutral oil passage to the actuator is gradually opened, and its speed regulation is a combination of oil return meter-in and oil-in meter-out. Realization, because the pressure established by oil return throttling overcomes the load pressure, so the speed regulation characteristics are affected by the load pressure, oil pump flow, and valve stem stroke. The higher the load pressure...

AI Technical Summary

Problems solved by technology

The overall power loss of the load-sensing system is low, the efficiency is higher than that of the conventional hydraulic system, and compound action can be realized, but it must be used with the plunger pump and the load-sensing valve, so the entire control system is expensive; and the piston pump and the load-sensing valve internal The structure is complex, the oil cleanliness is very high, and it is prone to failure, and the maintenance cost is high

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