Tightness detection device

Abstract

The present invention provides a tightness detection device which is formed by a detection mechanism and a control system. By using the 'pressure drop method' detection principle, a detected iron box is placed in an openable sealed box, then the sealed box is closed, an interlayer space is pumped to be vacuum, a pressure difference with the inner cavity of the iron box, and the tightness of the iron box is evaluated through measuring the interlayer space pressure change value in a predetermined time. Through adding a comparison tank with the approximate volume of the interlayer space, a detection process is divided into two steps, the first step is forming pressure balance in the comparison tank and the interlayer space and using a balanced pressure value to judge whether a large flow leakage condition exists, and the second step is using the 'pressure drop method' to detection a small leakage condition. The tightness detection device provided by the invention is used in a bullet automatic package production line, the online lossless detection of the tightness of the iron box can be realized, and the tightness detection of a national standard iron box and an American standard iron box can be realized through replacing a mold.

Description

technical field [0001] The invention belongs to the field of automatic packaging of bullets, and in particular relates to a sealing detection device. Background technique [0002] Traditional gun ammunition packaging iron box leak detection adopts "wet method" detection, the iron box needs to be soaked in water and inspection holes are opened, which is not conducive to the realization of automatic production, and there are hidden dangers such as residual water stains are easy to rust, and the secondary hot tin seal is not tight. Contents of the invention [0003] In order to solve the problems existing in the above-mentioned bullet packaging iron box sealing inspection process that the iron box needs to be soaked in water and the inspection hole is opened, which is not conducive to the realization of automatic production, the residual water stains in the iron box are easy to rust, and the secondary hot tin seal is not tight, etc., to achieve On-line non-destructive detecti...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems existing in the above-mentioned bullet packaging iron box sealing inspection process that the iron box needs to be immersed in water and the inspection hole is opened, which is not conducive to the realization of automatic production, the residual water stains in the iron box are easy to rust, and the secondary hot tin seal is not tight, etc., to achieve On-line non-destructive testing of iron box airtightness, the invention provides a airtightness inspection device

In view of the defect that this detection method may have large flow leakage that cannot be accurately detected, the detection process is divided into two steps by adding a comparison tank with a volume similar to that of the interlayer space. The first step is to allow the comparison tank to form a pressure balance with the interlayer space. Use the balanced pressure value to judge whether there is a large flow leakage, and then use the "pressure drop method" to detect small leakage in the second step

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