Pressure-keeping detection device

Abstract

The invention discloses a pressure-keeping detection device which includes a main machine base, an air feed pump, a plugging cylinder, a compaction cylinder, a shaft pipe, a spacing seat, and a joint bracing frame. A compact piston rod is provided with a batter board thereon. A sealing head piston rod is provided with a driving rack thereon. The shaft pipe is provided with a plastic pipe external end sealing board, a steel pipe external end sealing board, a plastic pipe external sealing loop, and a steel pipe external sealing loop. The shaft pipe is provided with a first air inlet thereon. The first air inlet is provided with a non-return valve thereon. The external wall of the shaft pipe is provided with a first air pressure sensor. A steel-plastic adapter supported by the joint bracing frame is positioned between the spacing seat and the plugging cylinder. An air supply end of the air feed pump is in communication with the interior of the shaft pipe through an air supply pipe. According to the invention, the beneficial effects are: the device has a reasonable structure which can appropriately position and clamp the steel-plastic adapter, can guarantee sealing property and does not damage the steel-plastic adapter, has a self-adaptive sealing structure, and can strengthen sealing effects upon high air pressure detection.

Description

technical field [0001] The invention belongs to the technical field of tightness testing of pipe joints, and in particular relates to a pressure-holding testing 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 ...

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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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