Pipeline built-in sealing device

Abstract

The invention relates to a large diameter pipeline built-in sealing device. A hole is formed in the center of a plugging plate, a rolling bearing is arranged in the hole, and an internal thread sleeve is installed on the plugging plate through the rolling bearing. One end of the internal thread sleeve is provided with a rotating device, and the other end of the internal thread sleeve is connected with one end of an external thread central rod in a matched mode. The other end of the external thread central rod is hinged with one end of a connection rod II. The other ends of two connection rods I are provided with slope sealing heads. The other end of the connection rod II is hinged with a rigid semi-ring. The rigid semi-ring is provided with a rubber sealing ring. The plugging plate is further provided with a telescopic rod which is fixedly connected with the plugging plate through a connection end of the telescopic rod, and the other end of the telescopic rod is hinged with the rigid semi-ring. The plugging plate is further provided with a fixing ring which is used for limiting the telescopic rod to move on the plugging plate. The pipeline built-in sealing device can achieve sealing of an end of a pipeline without the need for welding. In addition, the pipeline built-in sealing device is simple to manufacture, convenient to assemble and disassemble, and good in sealing effect.

Description

technical field [0001] The invention relates to a pipeline sealing device, in particular to a built-in sealing device for a large diameter pipeline. Background technique [0002] At present, during the construction of long-distance direct buried heating pipelines, at the end of the construction every day, the ends of the laid pipelines need to be temporarily closed to avoid debris, rainwater or small animals from entering the pipeline due to various accidents It increases the difficulty of pipeline flushing and the risk of operation. At present, the commonly used method for the temporary sealing of the end of the pipeline is to close it with a blind plate, that is, to seal it by fully welding the blind plate on the end of the pipeline. During construction on the second day, the welded blind plate needs to be removed with a gas cutting torch. With this method, not only the pipe wall is easily damaged when welding and removing the blind plate, but also the process of welding...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problems existing in the prior art that the pipe wall is easily damaged during the process of welding and removing the blind plate, the construction is complicated, and the work efficiency is low. Due to the technical problem of high cost, the purpose of the present invention is to provide a built-in closing device for pipelines, which can realize the sealing of the end of the pipeline without welding, and avoid damage to the pipe wall during the process of closing the end of the pipeline. damage, and the built-in sealing device of the pipeline is simple to manufacture, easy to assemble and disassemble, and has a good sealing effect. It can be reused after disassembly, reducing construction costs

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