Pressurization testing machine

Abstract

The invention discloses a pressurization testing machine. The pressurization testing machine includes a main machine seat, an air feed pump, a sealing air cylinder, a pressing air cylinder, a shaft pipe, a limiting seat and an adapter support frame; a pressing piston rod is provided with a positioning plate; a sealing piston rod is provided with a driving frame; the shaft pipe is provided with a plastic pipe outer end sealing plate, a steel pipe outer end sealing plate, a plastic pipe outer sealing ring and a steel pipe outer sealing ring; the shaft pipe is provided with a first air inlet; the first air inlet is provided with a first air intake one-way valve; the outer wall of the shaft pipe is provided with a first pressure sensor; a steel-plastic adapter supported by the adapter support frame is located between the limiting seat and the sealing air cylinder; and the air feed end of the air feed pump is communicated with the interior of the shaft pipe through an air feed pipe. The overall structure of the pressurization testing machine is reasonable. With the pressurization testing machine adopted, in-place positioning and clamping of the steel-plastic adapter can be realized, airtightness can be ensured, and at the same time, the steel-plastic adapter will not be damage due to clamping. The pressurization testing machine adopts an adaptively-adjustable sealing structure, so that a sealing effect in high-pressure detection can be strengthened.

Description

Technical field [0001] The invention belongs to the technical field of pipe fitting joint tightness testing, and particularly relates to a 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, a large number of steel-plastic conversion joints are used in gas and natural gas transportation pipelines (external gas pipelines are mostly PE The pipes are mostly steel pipes when entering the room, and steel-plastic conversion joints are needed during the transfer process). The steel-plastic conversion joint itself includes 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 butted with one end of the plastic pipe section to form a connecting section. The connecting section is mostly clamped between one end of the steel pipe section and one end of ...

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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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