Gas tightness detection device

Abstract

The invention discloses a gas tightness detection device comprising a main base, a gas supply pump, a plugging cylinder , a pressing cylinder, a shaft tube, a limiting base, and a joint supporting rack. A pressing piston rod is provided with a positioning plate, and an end socket piston rod is provided with a driving rack. The shaft tube is provided with a plastic tube outer end sealing plate, a steel pipe outer end sealing plate, a plastic tube outer sealing ring, and a steel pipe outer sealing ring. The shaft tube is provided with a first gas inlet opening, which is provided with a first gas inlet check valve, and the outer wall of the shaft tube is provided with a first air pressure sensor. The steel-plastic conversion joint supported by the joint supporting rack is disposed between the position-restricted seat and the plugging cylinder, and the communication of the gas supply end of the gas supply pump with the inner side of the shaft tube by the gas supply pipe. The gas tightness detection device is advantageous in that the whole structure is reasonable, the positioning and the clamping of the steel-plastic conversion joint are in place, the sealing performance can be guaranteed, and the steel-plastic conversion joint cannot be damaged; the self-adaption adjusting sealing structure is provided, and the sealing effect during the high pressure detection can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of tightness testing of pipe joints, and in particular relates to an air detection device. Background technique [0002] Steel-plastic conversion joints, also known as PE steel-plastic conversion joints, have been widely used in current production and life. For example, steel-plastic conversion joints are widely used in gas and natural gas transportation pipelines (most of the external gas pipelines are PE Pipes are mostly steel pipes when entering the room, and steel-plastic conversion joints are required during the transfer process). The steel-plastic conversion joint itself consists of a steel pipe section (a section of steel pipe) and a plastic pipe section (usually a section of PE pipe). One end of the steel pipe section is docked with one end of the plastic pipe section to form a connection section. The connection section is usually clamped by one end of the steel pipe section and one end of the plasti...

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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 steel-plastic conversion joint is also relatively troublesome; When the steel-plastic conversion joint is sealed and the sealing ring is placed outside the two ends of the steel-plastic conversion joint, and the hydraulic cylinder (or air cylinder) is used to clamp the two ends of the steel-plastic conversion joint for sealing, the strength of both is difficult to control. If the pressing or clamping force is not enough, the seal at the end of the steel-plastic conversion joint may not be reliable, which will affect the accuracy of the test and cause misjudgment of quality. If the pressing or clamping force is excessive, it may cause The deformation of the steel-plastic conversion joint causes the end face (pipe end) of the steel-plastic conversion joint to be uneven, which makes it impossible to form a seal between the steel-plastic conversion joint and the pressure plate, resulting in misjudgment of quality. Excessive force may also directly damage the steel-plastic conversion joint

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