All-inner plastic composite steel pipe and flange assembly and its forming process

Abstract

The invention relates to a full internal plastic composite steel tube and flange combination piece and a molding process thereof, and belongs to the technical field of engineering pipes for medium conveying and manufacturing. The end face of a flange is integrally connected with the end face and the inner wall of a steel tube to be provided with a rotary plastic layer, and the matching face of the rotary plastic layer and the flange and the matching face of the rotary plastic layer and the steel tube are in fusion welding fixedly; and during molding, the two ends of the steel tube are sealed through end caps, and a cavity formed by connecting a cover plate, a molding check ring and the flange in a defined manner forms a molding zone of the rotary plastic layer matched with the flange. When the technology is applied, the steel tube and the flange are completed wrapped through the overall molded rotary plastic layer, the possibility of contact between conveyed media and the metal faces of the steel tube and the flange is thoroughly avoided, rotary plastic layers of two adjacent flanges are in butt joint to form sealing in the connecting process, a sealing ring is not needed any more, and the problems of leakage and the like caused by non-in-place sealing or sealing ring aging are solved; and checking of a professional institute proves that after specimens are in butt joint, under the 1.60 MPa hydrostatic testing pressure, leakage at the 15 mim tubular products and connecting positions is avoided, and conveying medium permeation corrosion hidden dangers are thoroughly eliminated.

Description

technical field [0001] The invention belongs to the technical field of engineering pipelines for medium transportation and forming processes, and in particular relates to an assembly of all-inner plastic composite steel pipes and flanges and a forming process. Background technique [0002] The steel-plastic composite pipe is coated with high-adhesion, anti-corrosion, food-grade hygienic polyethylene powder coating or epoxy resin coating on the inner wall, combining the high strength, high rigidity, and good pressure resistance of the steel pipe with the non-scaling of the plastic pipe. , corrosion resistance, smooth inner wall, small flow resistance and other advantages are effectively combined to overcome the defects of steel pipes and plastic pipes used alone. As a healthy water supply pipe, it has been widely used in water supply and hot water systems for industrial and civil buildings. ; During the installation and construction of the project site, use the connecting fla...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to provide an all-inner plastic composite steel pipe and flange assembly and its forming process technical scheme, which can be directly connected to the flange without using a sealing ring, completely blocking the contact between the conveying medium and the metal surface of the steel pipe and flange The possibility of corrosion, and at the same time, it can completely avoid the leakage caused by the aging of the sealing ring, and effectively overcome the problems existing in the prior art

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