Pipe blank forming mold structure of double-wall corrugated pipe

Abstract

The invention relates to a pipe blank forming mold structure of a corrugated pipe, and in particular relates to a pipe blank forming mold structure of a plastic double-wall corrugated pipe. The pipe blank forming mold structure comprises a top and a middle sleeve, the rear end of the top is provided with a groove, the front end of the middle sleeve is provided with a bulge, the top and the middle sleeve are in match connection to form a mold body, a shunting cone bracket is arranged in the groove of the top, the front end of the top is fixedly connected with a porous plate, an inner wall melt runner cavity and an outer wall melt runner cavity are symmetrically arranged at a central axis in the top from inside to outside, and an inner layer pipe wall forming mandrel, an outer layer pipe wall forming mandrel, an inner layer pipe wall forming die and an outer layer pipe wall forming die are arranged at a central axis in the middle sleeve from inside to outside. The mold structure disclosed by the invention is simple in structure, long in service life and good in popularization.

Description

technical field [0001] The invention relates to a forming die for corrugated pipes, in particular to a pipe blank forming die structure for plastic double-wall corrugated pipes. Background technique [0002] The double-wall corrugated pipe is a smooth and flat surface with a corrugated outer circle and an ordinary straight pipe inner circle. It is made of two layers of pipe walls fused into a double-walled corrugated pipe. High-density polyethylene (HDPE) double-wall corrugated pipe is a new type of pipe with a ring-shaped outer wall and a smooth inner wall. It is widely used in large-scale water transportation, water supply, drainage, sewage discharge, exhaust, subway ventilation, mine ventilation, and farmland irrigation. etc. Ordinary thin-walled pipes cannot adapt to this harsh working environment and are prone to damage. The existing corrugated pipes are formed by continuous alternate injection molding of rectangular convex rings and rectangular concave rings. The recta...

AI Technical Summary

Problems solved by technology

High-density polyethylene (HDPE) double-wall corrugated pipe is a new type of pipe with a ring-shaped outer wall and a smooth inner wall. It is widely used in large-scale water transportation, water supply, drainage, sewage discharge, exhaust, subway ventilation, mine ventilation, and farmland irrigation. etc. Ordinary thin-walled pipes cannot adapt to this harsh working environment and are prone to damage. The existing corrugated pipes are formed by continuous alternate injection molding of rectangular convex rings and rectangular concave rings. The rectangular surface has strong compression resistance, single bending and The toughness is insufficient, the elongation is poor, and it is easy to deform and crack. In this way, it is necessary to arrange reinforcing ribs in the pipe wall, which increases the difficulty of production and the amount of materials used, and increases the cost.

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