With the development of the industries of automobiles, motorcycles, gas applications, food, pharmaceutical, the AIr tightness detection for airtight cubage products has become increasingly important. To ensure the quality of products, the air tightness of the products must be detected. Therefore, to develop a set of high accuracy, automatic and low-price air tightness detecting system is of great practical significance in improving production efficiency and reducing the labor lOAds and improving

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