Sealing device for pipeline inner diameter welding seam

Abstract

The invention belongs to the technical field of pipeline construction equipment, and discloses a sealing device for a pipeline inner diameter welding seam. The sealing device is characterized by comprising a walking device and a fixing device, wherein the walking device comprises a supporting disk; a supporting sleeve perpendicularly correspondingly connected with the supporting disk is fixedly arranged at the circle center of the supporting disk. The sealing device is reasonable in overall structure and convenient to operate; compared with robot equipment with complicated structure and high manufacturing cost, the sealing device is simple in structure, convenient to use, completely controllable in precision, obvious in economical benefit for a construction unit and low in operation difficulty, and guarantees the sealing effect on the inner wall of a pipeline.

Description

technical field [0001] The invention belongs to the technical field of pipeline construction equipment, and in particular relates to a sealing device for welding seams of butt ends of pipeline inner diameters. Background technique [0002] In the existing technology, in order to make full use of the underground space and prevent weathering and corrosion of equipment, the pipelines of urban central heating are buried underground, which not only does not occupy the space above the road, but also prevents weathering and corrosion of pipelines caused by wind and sun. Before the underground laying, a multi-layer protective layer will be set on the outer layer to prevent the soil from corroding the pipeline, and the service life of the pipeline is guaranteed to a certain extent. [0003] However, as time goes by, the pipeline will not only be corroded by the soil in the ground, but also corrode the pipeline from the inside; the pipeline will inject high-temperature water during ...

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Problems solved by technology

[0003] However, as time goes by, the pipeline will not only be corroded by the soil in the ground, but also corrode the pipeline from the inside; the pipeline will inject high-temperature water during the heating season, and the water temperature at the water injection end of the heating company is generally 80 ° C, and the water body Chemical components are usually added, both for production needs and to prevent users from privately draining hot water in pipelines. High-temperature water and chemical components will inevitably cause corrosion on the inner wall of the pipeline; From contact with water body to contact with air, from high temperature to low temperature, the rust is very obvious. The phenomenon of pipeline corrosion and leakage is very common as time goes by. This is also the common phenomenon of continuous excavation and maintenance of pipelines in most urban roads phenomenon, and the excavation and maintenance is carried out on the leak, and the leak can only be found after the change of the pressure difference after the leak. Therefore, it is very common for urban roads to constantly change places for excavation and filling, which seriously affects travel.

[0004] In order to prevent the heating pipe from being corroded from the inside, a layer of high-temperature resistant protective layer is usually installed on the inner wall of the pipe, which can significantly reduce the inner wall corrosion of the pipe, but the pipe itself has a fixed length, and it will be aligned with the end of the pipe when laying Butt welding is carried out, and the welding is carried out from the outer wall, which is convenient for operation and can prevent the protective layer of the internal joint from being damaged by high temperature. However, the external welding of the pipe is thick and can seal the outer wall of the pipe. However, the phenomenon of heat transfer will more or less affect the inner wall, and then damage the protective layer of the inner diameter; moreover, there will still be gaps at the butt joint of the inner diameter, and high temperature water and chemical costs will continue to corrode the inner diameter butt joint after long-term use Even if the gaps are small, the residual water stains in the gaps will accumulate and corrode the pipes even in the off-heating season, which will cause the pipes to gradually corrode from the inner diameter butt joints, and eventually cause pipeline leakage, which is concentrated in the entire city In the heating pipeline, the number of butt joints is very large. At present, there is no way to protect the inner diameter weld of the pipeline; Affected

[0005] At present, there are some special equipment to maintain the inner diameter of the pipeline, but the equipment itself is highly complex, and the diameter of the pipeline is different according to the heating needs. The versatility of the special equipment is poor, and ordinary heating companies cannot afford to purchase and maintain professional equipment. Moreover, thermal power companies are mostly financially subsidized industries that are greatly affected by the fuel market. It is unrealistic to use professional and complex equipment for operations. Instead of continuous maintenance in the later stage, it is better to improve the sealing in the early stage

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