Sealing mechanism for full-automatic chamfering sealing equipment for steel-plastic composite pressure pipe

Abstract

The invention provides a sealing mechanism for full-automatic chamfering sealing equipment for a steel-plastic composite pressure pipe. The sealing mechanism comprises an air bag supporting plate, anouter air bag casing, an outer air bag nozzle and the like; the outer air bag casing is spirally fixed to the air bag supporting plate; mounting openings are formed in the air bag supporting plate andthe outer air bag casing; the outer side of the outer air bag casing is coated with a cable coil; high-frequency power connectors are arranged in the positions, close to the tips, of two ends of thecable coil; the cable coil adopts the hollow structure; and cooling connectors are arranged at the tips of the cable coil. By the aid of the sealing mechanism, the end surfaces of the pipe are sealedin such a manner that melted inner-layer and outer-layer resin of the pipe is extruded to the end openings of the pipe by the aid of inner and outer air bags, the sealed part and the inner-layer and outer-layer resin of the pipe are melted into a whole, and the exposure phenomenon of the steel pipe layer can be avoided. The problem of oxidation corrosion of the steel-plastic composite pressure pipe during placement is avoided, meanwhile, the condition of failure of seals of the end openings due to ejection of the steel pipe layer during use of the steel-plastic composite pressure pipe is avoided, and the sealing performance of the steel-plastic composite pressure pipe is improved.

Description

technical field [0001] The invention relates to the field of processing steel-plastic composite pressure pipes, in particular to a sealing mechanism for automatic chamfering and sealing equipment for steel-plastic composite pressure pipes. Background technique [0002] The steel-plastic composite pressure pipe is made of argon arc butt welded galvanized steel pipe as the middle layer, and non-metallic thermoplastic materials such as high temperature and high pressure heat resistant polypropylene, polyethylene or polybutene as the inner and outer layers. It is a pipe that combines the advantages of metal pipes and plastic pipes. After the steel-plastic composite pressure pipe is cut, the end face of the internal steel pipe will be exposed at the cross section. When the steel-plastic composite pressure pipe is placed for a long time, it will cause oxidation and corrosion of the steel pipe on the end face, which not only affects the appearance but also affects the use of the pi...

AI Technical Summary

Problems solved by technology

When injection molding is used to seal, only the inner wall of the pipe end is isolated from the exposed steel pipe. The linear expansion coefficient of the resin is large, and the steel pipe layer is easy to push away the end-face sealing plastic, resulting in the exposed steel pipe layer and seal failure; the conveyed medium is also likely to pass through the outer wall. Infiltrate into the steel pipe layer and cause corrosion to it, leaving a safety hazard, not only low efficiency, but also high energy consumption

Butt welding sealing technology, because of the thin welding layer, the bonding effect of the inner wall cannot be detected. Although the energy consumption has been greatly reduced, its safety is worse than that of injection molding sealing.

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