Steel bent pipe facade transmission hot winding 3PE molding method

Abstract

The invention relates to a steel bent pipe facade transmission hot winding 3PE molding method which is characterized in that steel bent pipes of which the surfaces are cleaned are hoisted to an erosion resistant coating operating zone; after being clamped by an upper hydraulic pipe sending mechanism and a lower hydraulic pipe sending mechanism for fixation, the steel bent pipes slowly and vertically move downwards to sequentially pass through the stations such as a medium frequency heating coil, an epoxy powder spraying device, an adhesive extruder, a polyethylene extruder, a roller and a water cooling device; after bent pipe outer surface heating, epoxy powder spraying, adhesive side winding and polyethylene side winding, the steep bent pipes are rolled through the roller and are adhered into an integral structure; and water cooling is carried for shape setting. The method is high in mechanization and automation degree, applicable to steel bent pipe 3PE erosion resistant coating hot winding molding, and high in working efficiency, saves raw materials, overcomes the defects that the quality of the erosion resistant coating is low and is hard to control or the erosion resistant coating is unmatched with a straight pipe 3PE erosion resistant coating due to the traditional technologies of manual liquid epoxy spraying for corrosion prevention, manual heat shrinking sleeve baking for corrosion prevention, dual-layer epoxy powder spraying and bent pipe cold belt winding heat fusion method.

Description

technical field [0001] The invention belongs to the technical field of forming a composite structure of an anticorrosion layer of a steel elbow, and in particular relates to a 3PE forming method for steel elbow vertical transmission thermal winding. Background technique [0002] After years of development and evolution of steel pipe external anti-corrosion coatings, the survival of the fittest has developed to today's dominant 3PE coating (also known as three-layer PE, three-layer polyethylene coating), which has been promoted on long-distance pipelines around the world. . As an important link in the pipeline construction, the elbow is limited by its special structure. The coating structure is always inconsistent with the 3PE coating of the main pipeline, which leads to its always being a weak link in the quality of the entire pipeline operation, affecting the entire pipeline. The service life of the long-distance pipeline, and the high maintenance cost of the pipeline. ...

AI Technical Summary

Problems solved by technology

This method can not only improve the shortcomings of low coating production efficiency, uneven coating thickness, low degree of mechanization, and defects in the formed coating of the 3PE anti-corrosion molding process (Chinese patent CN202040483U) of the elbow cold strip winding hot melt method, but also can Improving the peeling strength and cathodic peeling index of the 3PE finished pipe coating of the bent pipe, so that it can meet the performance testing requirements of the 3PE anti-corrosion of the straight pipe, is a completely different forming method from the above-mentioned fourth kind of 3PE anti-corrosion coating of the bent pipe

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