Air tightness detecting device and servo control method thereof

Abstract

The invention discloses an air tightness detecting device and a servo control method thereof. The air tightness detecting device comprises a first gas source, a first pressure sensor and a first proportional servo valve. The first gas source and the containing cavity of a first object to be detected are connected by a first proportional servo valve. The first pressure sensor is connected to the containing cavity of the first object to be detected and is used for detecting the pressure in the containing cavity of the first object to be detected so as to judge the air tightness of the containing cavity of the first object to be detected. The first pressure sensor is also connected to the first proportional servo valve and is used for adjusting the state of the first proportional servo valve. Through improving control loop design and a server control process, the problems of the low accuracy of a direct pressure testing method and the inconvenient operation of a differential pressure test method are solved effectively, according to the device and the corresponding servo control method, the opening of an electro-pneumatic proportional servo valve is controlled through a closed-loop system to control the flow of gas in the loop, and the air tightness of the system can be detected.

Description

technical field [0001] The invention belongs to the technical field of air tightness detection, and more specifically relates to an air tightness detection device and a servo control method thereof. Background technique [0002] Air tightness testing is an important means to measure the sealing performance of many industrial products, especially in aerospace, aviation, instrument and other industries, air tightness testing is an important and frequently used testing method. The traditional manual airtight detection method is cumbersome and labor-intensive. At the same time, due to human factors, it is easy to cause missed and false detections. With the continuous development of microelectronics technology and pneumatic technology, airtight detection methods have also been improved. At present, the most widely used airtight detection methods are direct pressure test method and differential pressure test method. The direct pressure test method is to fill the measured contain...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the object of the present invention is to provide an airtight detection device and its servo control method, wherein by improving the key control loop design and servo control process in the device, it is different from the existing Compared with the technology, it can effectively solve the problems of low accuracy of the direct pressure test method and inconvenient operation of the differential pressure test method, and the device and the corresponding servo control method are controlled by the closed-loop control system to control the opening of the electric-pneumatic proportional / servo valve The flow rate of gas in the circuit can effectively detect the air tightness of the system

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