Auxiliary overlap joint hydraulic match grinding process for spool valve of servo valve

Abstract

The invention relates to a hydraulic match grinding process for the lap amount of a slide valve pair of a servo valve. The process comprises the following steps: (1). the slide valve pair of the servo valve is arranged in a process shell; a sealing gland and a whole pressing sleeve are adopted to seal each oil circuit of the process shell; a displacement sensor is arranged on one end of a valve core of the servo valve; and a flow sensor is arranged in a feedback cavity of the slide valve pair; (2). oil is supplied to the slide valve pair; when a test is begun, the valve core of the servo valve is dragged to and fro; and according to collecting values of the displacement sensor and the flow sensor, a match grinding curve of a working side of the slide valve pair is drawn; (3). the match grinding curve is judged and read; a value of the lap amount of the working side of the slide valve side is judged and is compared with the design requirement of the servo valve; and the working side corresponding to the value larger than the design requirement is sharpened and grinded; and (4). the steps from the step (2) are carried out repeatedly till the slide valve pair meets the design requirement.

Description

technical field [0001] The invention relates to a matching grinding process for the overlapping joint amount of a slide valve pair of a servo valve. Background technique [0002] The spool valve pair is the power amplification stage of the servo valve, and its dynamic and static quality has a great influence on the dynamic and static quality of the entire servo valve. The structure of the servo valve is complicated, and there are many oil passage holes and intersecting holes on the shell, which are not easy to block and easily cause leakage, making measurement difficult. . [0003] Since the gas distribution measurement uses low-pressure gas as the measurement medium, it is easy to block the outside and the test is simple and clean. However, due to the influence of the stability of the pressure difference near the zero position, the gas distribution curve is not linear enough, and the test results are not accurate enough. At the same time, there are problems such as slow t...

AI Technical Summary

Problems solved by technology

The structure of the servo valve is complicated, and there are many oil passage holes and intersecting holes on the shell, which are not easy to block and easily cause leakage, making measurement difficult.

[0003] Since the gas distribution measurement uses low-pressure gas as the measurement medium, it is easy to block the outside and the test is simple and clean. Influenced by it, the grinding curve is not linear enough, and the test results are not accurate enough

At the same time, there are problems such as slow test speed and poor repeatability in gas distribution measurement, resulting in low production efficiency

[0004] Hydraulics and Pneumatics, 1999, 000 (002), "Microcomputer-controlled Servo Valve Hydraulic Grinding Precision Measurement Technology"; author Zhang Jianfeng, "Research on Servo Valve Hydraulic Grinding Technology" involves hydraulic grinding technology, but This article mainly explains from the establishment of a computer platform to automatically draw curves, including two parts of test equipment and test software. It does not involve how to interpret the curve, nor does it disclose how to perform sealing installation and other related content

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