Plug-in type two-stage proportional velocity regulating valve based on pressure rising rate detector

Abstract

The invention provides a plug-in type two-stage proportional velocity regulating valve based on a pressure rising rate detector. The proportional velocity regulating valve detects change of an inlet pressure or an outlet pressure of a main valve in real time by means of the pressure rising rate detector and controls the pressure of a control cavity of the main valve and reduces the flow overshootof the main valve by changing the opening of the valve port of the pressure rising rate detector. The plug-in type two-stage proportional velocity regulating valve based on the pressure rising rate detector disclosed by the invention has the advantages of detecting pressure jump rapidly, regulating the flow overshoot induced by pressure jump quickly and improving the equal flow characteristic of the proportional velocity regulating valve and improving the dynamic property of the proportional velocity regulating valve by combining a digital flow compensator.

Description

technical field [0001] The invention belongs to the technical field of electro-hydraulic control valves, and in particular relates to a plug-in two-stage proportional speed regulating valve based on a pressure soaring rate detector. Background technique [0002] In the electro-hydraulic control system, the interpolation-type two-stage proportional throttle valve is widely used in the motion control of hydraulic actuators. Due to the influence of the pressure difference at the valve port, the output flow of the cartridge-type two-stage proportional throttle valve is not constant. Displacement-flow feedback proportional throttle valve is a cartridge type two-stage proportional throttle valve. One of its advantages is that there is an approximate linear relationship between the flow through the main valve and the flow through the pilot valve. However, its output Flow is still affected by changes in differential pressure across the valve port. In order to reduce the influence o...

AI Technical Summary

Problems solved by technology

The "Electro-hydraulic proportional decompression and speed regulation compound control valve" with the publication number CN1053110 uses control algorithms and hardware circuits to improve the control accuracy and equal flow characteristics of the valve, but due to the dynamic response of the hardware circuit, the dynamic response and control of the pressure sensor Due to the influence of the calculation time of the algorithm, when the inlet pressure or load pressure of the hydraulic valve undergoes a sudden change, it will still cause the valve core shock and flow overshoot, which will seriously affect the dynamic performance of the valve.

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