A Pneumatic Measuring Device and Method for the Overlapping Quantity of an Electro-hydraulic Servo Valve

Abstract

The invention discloses an overlapping quantity pneumatic measuring device and method of a large-flow electro-hydraulic servo valve. The overlapping quantity pneumatic measuring device is mainly composed of a valve seat pressing air cylinder, a differential pressure type flow meter, a tension pressure sensor, an electric translation table, a valve sleeve push-out air cylinder, a valve sleeve ejector rod, an air distribution seat, an auxiliary ejector rod, a sliding valve assembly, a guide seat, a valve seat pressing rotating air cylinder, a displacement sensor, a displacement sensor horizontalmoving air cylinder, a sliding block guide rail, a valve element clamping air cylinder and the like; According to the method, an overlapping quantity pneumatic comprehensive measuring method of a pressure type measuring gas path and a flow type measuring gas path is mainly adopted. The overlapping quantity pneumatic measuring device has the advantages that under the premise that the overlapping quantity measuring precision and repeated precision requirements of the large-flow electro-hydraulic servo valve are met, the overlapping quantity measurement of large-flow sliding valve pairs with various size specifications can be achieved, the measuring automation degree and the testing efficiency are greatly improved, and the skill requirements of operating workers are reduced.

Description

technical field [0001] The invention belongs to the technical field of electro-hydraulic servo valves, and in particular relates to a device and method for pneumatically measuring the overlapping amount of a large-flow electro-hydraulic servo valve. Background technique [0002] The electro-hydraulic servo valve is an important control element in the electro-hydraulic servo system. Its electro-hydraulic conversion and power amplification are mostly used in aerospace, ships, robots and other high-power and high-response occasions. The dimensions that require strict control of precision during the manufacturing process include the size of the valve core and valve sleeve, the cylindricity of the inner hole of the valve sleeve and the outer circle of the valve core, the size of the throttle hole, and the aspect ratio. Among them, the size requirements of the valve core and valve sleeve are extremely high, and the manufacturing cost is also high. At present, domestic manufacturer...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a large-flow electro-hydraulic servo valve superimposition pneumatic measurement device and method, which is used to solve the problem of measurement repeatability and reliability of the existing large-flow electro-hydraulic servo valve superposition measurement device and method in the background technology. , Insufficient in test efficiency, automation degree, etc.

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