A sealing pressure testing machine

Abstract

The invention discloses a sealing tester. The sealing tester comprises a main engine base, a gas supply pump, a sealing air cylinder, a pressing air cylinder, a shaft tube, a limiting base and a joint supporting frame, wherein a positioning plate is arranged on a pressing piston rod; a drive frame is arranged on an end enclosure piston rod; a plastic tube outer end sealing plate, a steel tube outer end sealing plate, a plastic tube outer sealing ring and a steel tube outer sealing ring are arranged on the shaft tube; a first gas inlet is formed in the shaft tube; a first gas inlet one-way valve is arranged on the first gas inlet; a first gas pressure sensor is arranged on the outer wall of the shaft tube; a steel-plastic conversion joint supported by the joint supporting frame is positioned between the limiting base and the sealing air cylinder; and the gas supply end of the gas supply pump communicates with the inner part of the shaft tube through the gas supply tube. The sealing tester has the beneficial effects that: the integral structure is reasonable, the positioning and the clamping of the steel-plastic conversion joint are achieved, the sealing property can be guaranteed while the steel-plastic conversion joint is not damaged; and the sealing tester has a sealing structure which can be regulated in a self-adapting manner, and can strengthen the sealing effect during high gas pressure detecting.

Description

technical field [0001] The invention belongs to the technical field of tightness testing of pipe joints, in particular to a sealing pressure 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 of the plastic...

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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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