Low throttling noise double-margin servo control valve group

Abstract

The invention belongs to the field of hydraulic servo control systems, and provides a low throttling noise double-margin servo control valve group. The low throttling noise double-margin servo controlvalve group comprises a three-position three-way hydraulic change-over valve, a two-position two-way electro-hydraulic directional control valve, a check valve, a main servo valve, a standby servo valve, a two-position six-way electro-hydraulic directional control valve, oil replenishing check valves, a control module and a throttling valve. According to the low throttling noise double-margin servo control valve group, through combined integration of the hydraulic elements like the three-position three-way hydraulic change-over valve, the two-position two-way electro-hydraulic directional control valve, the check valve and the two-position six-way electro-hydraulic directional control valve, redundant backup of the servo valves is realized, load self-adaption change of the pressure of ports P of the servo valves is achieved, steering engine displacement closed-loop control of large over-running loads can be completed with low oil supply pressure, the differential pressure of the valveports of the servo valves under the over-running load condition is lowered, throttling noise of the control valve group is reduced and energy consumption is also reduced.

Description

technical field [0001] The invention belongs to the field of hydraulic servo control systems, in particular to a double margin servo control valve group with low throttling noise. Background technique [0002] The servo control valve group generally includes servo valves and other auxiliary hydraulic components, which are mainly used for the control of the hydraulic servo steering gear system to realize the closed-loop displacement of the steering gear hydraulic cylinder. [0003] The current servo control valve group uses a constant pressure source as the power source. The pressure difference at the end is very large, resulting in a large throttling noise. In addition, in the case of a small load, the pressure of the constant pressure source will be much higher than the load. When the steering gear hydraulic cylinder is closed-loop controlled, the pressure difference at both ends of the servo valve port is also large, and at the same time, the energy loss is also large. ...

AI Technical Summary

Problems solved by technology

[0003] The current servo control valve group uses a constant pressure source as the power source. The pressure difference at the end is very large, resulting in a large throttling noise

In addition, in the case of a small load, the pressure of the constant pressure source will be much higher than the load. When the steering gear hydraulic cylinder is closed-loop controlled, the pressure difference at both ends of the servo valve port is also large, and at the same time, the energy loss is also large.

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