All-enclosuring type electric melting pipe piece and mfg. method

Abstract

The invention discloses a full contained electric melting pipe and the manufacturing method thereof, adopting secondary injection moulding process, firstly pouring a parison of a certain thickness on a core stick, then fixing electrode column and welding electrode column and copper wire on the injection-moulded parison, then coiling and feeding the wired parison into a mould to pour to form an outer layer of a certain thickness, merging the parison and the outer layer into an organic whole, and fully containing the copper wire in the middle of the pipe, and finally after the finished product cools, adopting a core drawer to demould a complete pipe from the core stick. And the electric heating wire is fully contained inside the pipe, solving the problem of influencing welding effect by oxidizing of exposed resistance wire, and the inside surface of the pipe is smooth and has no traces of turning tool, thus unable to influence the welding effect.

Description

【Technical field】 [0001] The invention relates to connecting pipe fittings for pipelines, in particular to electrofusion pipe fittings. 【Background technique】 [0002] With the progress of the country's west-to-east gas pipeline, pipeline natural gas has entered thousands of households. Among the many pipes, PE pipes have become the ideal material for pipeline gas transmission due to their superior comprehensive performance, and are widely used, and the scope and quantity are constantly expanding. The connection between the pipes must adopt a certain connection method, and the connection of PE electric fusion pipe fittings is a method with convenient operation and reliable connection. The principle of the connection of electrofusion pipe fittings is: connect the electric heating wire buried in the electrofusion pipe fittings to the power supply, the heat generated by the heating of the electric heating wire will melt part of the plastic body of the pipe and pipe fittings, a...

AI Technical Summary

Problems solved by technology

The electrofusion pipe fittings produced by this process solve the exposed defect of copper wire, but due to the simple electric heating ironing on the warped plastic flange and the turning process to control the size of the plastic parts, the turning tool marks left on the inner surface of the pipe fittings , so that the inner surface of the pipe fittings is relatively rough, which affects the welding effect during welding

Moreover, because this process cannot realize fully automatic production, human factors have more influence on the quality of pipe fittings, and it is impossible to obtain stable and high-quality products.

[0006] Therefore, how to use the most effective method to manufacture electrofusion pipe fittings can not only avoid the resistance wire being exposed to oxidation and affect the welding effect, but also make the inner surface of the pipe fittings smooth without turning tool marks, which has become an important topic for our research.

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