Outer polygonal reinforced corrugated pipe and forming process thereof

Abstract

The invention provides the forming process of an outer polygonal reinforced corrugated pipe. The process comprises steps that an extruder extrudes a pipe body material in a molten state out of a moldhead, and the pipe body material enters a corrugated pipe forming mold; a circular ring pipe is formed through a corrugated pipe forming mold, a plurality of polygonal annular protrusions are formed on an outer wall of the circular ring pipe through three or more continuous polygonal mold modules, and the circular ring protrusions or smooth outer walls are formed on an outer wall of at least one end of the circular ring pipe with the polygonal annular protrusions through the circular mold modules located at at least one end of the continuous polygonal mold modules; the continuous pipe formed through the corrugated pipe forming mold is outputted and cooled; after the pipe is cooled, the pipe is cut off to form a pipe unit in the middle of the smooth outer wall or the circular ring protrusions; the outer polygonal reinforced corrugated pipe is obtained according to the forming process of the outer polygonal reinforced corrugated pipe. The process has advantages of high ring stiffness andconvenience in pipeline connection.

Description

technical field [0001] The invention relates to the technical field of plastic pipes, in particular to an outer polygon reinforced corrugated pipe and its forming process. Background technique [0002] Double-wall plastic corrugated pipe has a ring-shaped outer wall and a smooth cylindrical inner wall. With its excellent performance, it is widely used in buried drainage pipes, etc. It was first successfully developed in Germany in the early 1980s. After more than ten years of development and improvement, the promotion and application of double-wall corrugated pipes are on the rise. There are installation difficulties and safety hazards in terms of installation and durability. [0003] In order to solve the above problems, the patent number: CN201720489818.3 proposes an outer octagonal inner circle double-wall bellows, the inner wall of which is a double-wall bellows with a cylindrical structure, which changes the outer wall of the conventional ring structure into a polygon ...

AI Technical Summary

Problems solved by technology

It was first successfully developed in Germany in the early 1980s. After more than ten years of development and improvement, the promotion and application of double-wall corrugated pipes are on the rise. There are installation difficulties and safety hazards in installation and durability

[0003] In order to solve the above problems, the patent number: CN201720489818.3 proposes an outer octagonal inner circle double-wall bellows, the inner wall of which is a double-wall bellows with a cylindrical structure, which changes the outer wall of the conventional ring structure into a polygon structure to increase the contact area between the outer surface of the pipeline and the foundation in order to solve the above-mentioned problems, but the full polygon outer wall bellows structure proposed in this patent will cause the flexibility of the pipeline to decrease compared with the outer wall bellows of the ring structure. does not address security issues

[0004] However, according to the double-wall corrugated pipe with outer octagon and inner circle disclosed in this patent document, it is difficult to connect the pipes to each other due to the structure of the outer octagon, and because the outer octagon is easy to be separated from each other during the expansion process. Cracks appear at the joints. Therefore, the structure of the outer octagon and the inner circle prevents the pipes from being connected to each other through the expansion of the nozzle in the past.

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