In-tube air tightness pre-detection device

Abstract

Tube of the invention discloses an in-tube air tightness pre-detection device. The in-tube air tightness pre-detection device has the advantages of convenient operation and high accuracy of test results. With the in-tube air tightness pre-detection device adopted, end portions of tubes have low possibility of being damaged due to clamping. The in-tube air tightness pre-detection device includes an air supply pump, an air pressure sensor, a main rack, two push plate air cylinders, two side racks, an main end cover and an auxiliary end cover; the two push plate air cylinders are respectively arranged on the two side racks; the piston rod of one of the push plate air cylinders is connected with the main end cover, and the piston rod of the other push plate air cylinder is connected with the auxiliary end cover; the main end cover is provided with a main elastic sealing ring gasket; the auxiliary end cove is provided with an auxiliary elastic sealing ring gasket; and a main cover air hole is formed in the main end cover. With the in-tube air tightness pre-detection device adopted, the tubes can be positioned in place, and sealing performance can be ensured, and the tubes will not be damaged due to clamping. An adaptively-adjustable sealing structure is adopted, and therefore, sealing effects in high-pressure detection can be enhanced; and an auxiliary positioning structure is adopted, and therefore, the rollback of the end covers can be avoided, the push plate air cylinders can be protected, sealing effects can be improved, and the stability of a detection process can be maintained.

Description

technical field [0001] The invention belongs to the technical field of airtightness testing of pipe fittings, and in particular relates to an airtightness pre-inspection device inside a pipe. Background technique [0002] Pipe fittings (pipes) of various materials are often used to transport various gases and liquids. Gas or liquid flows in pipe fittings. Pipe fittings have different sealing requirements when used in different occasions. Generally speaking, pipe fittings with sealing requirements are used in Leakage testing is required before leaving the factory, otherwise there will be greater safety hazards. [0003] In the prior art, when testing pipe fittings, gaskets or sealing rings are usually placed on the outside of both ends of the pipe fittings, and at the same time, force-applying devices such as jacks or hydraulic cylinders are used to clamp the two ends of the pipe fittings, so that the two ends of the gasket or sealing ring and the pipe fittings The end (pipe...

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Problems solved by technology

[0004] The above-mentioned test method has the following disadvantages: 1. The operation process is complicated, and the weight of the frame is relatively heavy. It is necessary to immerse the frame in water with the help of external equipment, and the installation of the pipe fittings is also relatively troublesome; 2. Use a jack to press down the plate to seal the pipe fittings And when the sealing ring is placed outside the two ends of the pipe fitting and clamped by the hydraulic cylinder to seal at both ends of the pipe fitting, the strength of both is difficult to control. If the force of pressing down or clamping is not enough, the pressure plate and the pipe fitting end may The seal of the inner part is not reliable, which affects the accuracy of the test and leads to misjudgment of quality. If the pressure or clamping force is excessive, the pipe fittings will be deformed, resulting in uneven end faces of the pipe fittings (pipe ends), thus making the pipe fittings It cannot form a seal with the pressure plate, which will lead to misjudgment of quality. In addition, if the force of pressing down or clamping is excessive, it may also directly damage the pipe fittings

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