Composite pipe connecting structure, injection mold and implementation method

By designing composite pipe connection structures and injection molds, flange-type pipe fittings wrap the outside, inside, and ends of the composite pipe. Combined with expandable cores and cavities, the cracking and overflow problems of composite pipe flange connection structures are solved, achieving stable injection molding and convenient demolding.

CN117028716BActive Publication Date: 2026-03-24SHANDONG GUONENG IND CO LTD
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Patent Information

Application Number
CN202311022783.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-08-15
Publication Date
2026-03-24
Estimated Expiration
2043-08-15

AI Technical Summary

Technical Problem

In existing technologies, composite pipe flange connection structures may crack, overflow, and have difficulty in demolding, especially due to the large difference in the coefficients of thermal expansion between the steel core and non-metallic materials.

Method used

A composite pipe connection structure was designed, in which flange-type pipe fittings wrap the outside, inside and end of the composite pipe, and a telescopic core and cavity structure is adopted. The expansion and contraction of the core are controlled by a hydraulic cylinder to achieve stable injection molding of the composite pipe.

Benefits of technology

It effectively avoids cracking at the welding point between the inner wall of the composite pipe and the flange connection pipe fittings, solves the overflow problem, simplifies the demolding process, and improves injection molding efficiency.

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Abstract

The present application relates to the technical field of composite pipe, in particular to a composite pipe connecting structure, an injection mold and an implementation method, the composite pipe connecting structure comprises a composite pipe, the composite pipe is provided with a spiral reinforcing rib protruding outward, the composite pipe is internally provided with a steel pipe layer, the two ends of the composite pipe are cross sections, the cross sections are injection molded with flange connection type pipe fittings, the flange connection type pipe fittings wrap the outside, the inside and the end of the cross section; the minimum outer diameter of the tubular part of the flange connection type pipe fitting is greater than the maximum diameter of the highest point of the spiral reinforcing rib of the composite pipe, and the tubular length is greater than the pitch of the spiral reinforcing rib; the composite pipe connecting structure avoids the problem that the composite pipe inner wall and the flange connection type pipe fitting may crack at the fusion position, and the steel pipe in the composite pipe will not be exposed; the injection mold uses a core, avoids the overflow problem, and facilitates the taking out of the product after the flange connection type pipe fitting is injection molded.
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