A kind of airtight testing machine

Abstract

The invention discloses a sealing tester which comprises a main device base, an air supply pump, a plugging cylinder, a compacting cylinder, a shaft pipe, a limiting base and a joint supporting stand. A positioning plate is arranged on a compacting piston rod, a driving stand is arranged on a seal-head piston rod, and a plastic pipe outer end sealing plate, a steal pipe outer end sealing plate, a plastic pipe outer end sealing ring and a steal pipe outer end sealing ring are arranged on the shaft pipe. A first air inlet is arranged in the shaft pipe, a first air inlet check valve is arranged in the first air inlet, and a first air pressure sensor is arranged on the outer wall of the shaft pipe. A steel plastic pipe switching joint supported by the joint supporting stand is arranged between the limiting base and the plugging cylinder, and the air supply end of the air supply pump communicates with the interior of the shaft pipe through an air supply pipe. The integral structure is reasonable, and positioning and clamping of the steel plastic pipe switching joint are properly in place. Sealing performance can be ensured, and the steel plastic pipe switching joint may not be damaged due to clamping. The sealing structure has self-adaptive performance, and the seal effect during high air pressure detection can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of tightness testing of pipe fitting joints, and in particular relates to a tightness testing machine. 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 o...

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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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