Bending technological method of PE tube of 90-degree completely anticorrosive steel-plastic service tube

Abstract

The invention relates to a bending technological method of a PE tube of a 90-degree completely anticorrosive steel-plastic service tube. The bending technological method comprises the following steps: a, putting a part of the PE tube into boiled water, and heating for at least 60 minutes; b, inserting one end of the PE tube into a spring after the PE tube is heated up fully, bending on a bending device for 5 seconds-10 seconds, and fixing the bent part of the PE tube by a rope after one part of the PE tube is bent; c, carrying out quick baking sizing on the periphery of the bent part of the PE tube for 10s by naked flame after taking down the 90-degree completely anticorrosive steel-plastic service tube from the bending device; and d, putting the baking sized part of the PE tube into clean water, cooling for 10 minutes, and sizing, putting the 90-degree completely anticorrosive steel-plastic service tube outdoors for node failure processing, and fixing the rope after node failure processing so as to obtain the bend molded 90-degree completely anticorrosive steel-plastic service tube. The method is simple in technology, and low in cost; the quality is reliable; the fuel gas leakage accident can be prevented effectively.

Description

technical field [0001] The invention relates to a 90° fully anti-corrosion steel-plastic lead-in pipe PE pipe bending process method. Background technique [0002] At present, the 90° fully anti-corrosion steel-plastic introduction pipe "PE pipe bending process" produced by known suppliers or enterprises in the country is formed by injection molding or baking and heating of polyethylene raw materials. [0003] The characteristics of injection molding 90° full anti-corrosion steel-plastic inlet pipe are: according to the designed injection mold, it is formed by injection molding process from polyethylene raw material. The processing technology is simple, easy to form, economical and low cost. [0004] The disadvantages are: when the ground is covered with soil or other bending deformation or tensile deformation caused by external force, it is easy to cause the separation between the PE pipe and the joint sleeve or steel conduit, resulting in leakage of the 90° full anti-corr...

AI Technical Summary

Problems solved by technology

[0004] The disadvantages are: when the ground is covered with soil or other bending deformation or tensile deformation caused by external force, it is easy to cause the separation between the PE pipe and the joint sleeve or steel conduit, resulting in leakage of the 90° full anti-corrosion steel-plastic introduction pipe. Gas, affecting the safety of the entire pressure pipeline or casualty accidents

[0006] Disadvantages: In this bending process, due to the material of the 90° fully anti-corrosion steel-plastic introduction pipe, the material of the seamless steel pipe is different from that of the PE pipe, and the expansion coefficient and shrinkage ratio are also different. It is difficult to control the heating temperature

In particular, it is difficult to control the heating temperature and heating time, and it is easy to cause the bending angle to rebound, the rework rate is high, and the product quality is unstable.

In particular, gaps and brittle cracks on the surface of PE pipes are likely to occur at the joints of pipe joints, which are prone to gas leakage accidents.

[0007] In summary, the existing 90° fully anti-corrosion steel-plastic lead-in pipe "PE pipe bending process" has defects, which may easily lead to gas leakage accidents