Production technique of steel skeleton plastic composite pipe having plastic end and products thereof

Abstract

The invention discloses a production process and a product of a steel skeleton plastic composite pipe with a plastic end. The beneficial effect of the invention is that the problem that the steel skeleton plastic composite pipe is difficult to use hot-melt butt joint connection is solved by setting the injection molding end. The problem is that the steel skeleton plastic composite pipe with injection molding end provided by the present invention is connected by hot-melt butt joint connection, and the steel skeleton and the plastic end face connector are melted and connected as one, which completely solves the phenomenon of delamination and peeling off of the steel-plastic interface on the end face of the composite pipe. The reliability is greatly improved, and at the same time, it brings the advantages of low material consumption, easy manufacturing, low assembly cost, controllable welding pressure, little influence of human factors, and easy quality assurance.

Description

technical field [0001] The invention relates to a forming process of a steel frame plastic composite pipe and its products, in particular to a production process of a steel frame plastic composite pipe with a plastic end and its product. Background technique [0002] Steel skeleton composite pipe is a new type of pipe emerging in China in recent years. It is widely used in many fields such as petroleum, chemical industry, construction, shipbuilding, communication, electric power and underground gas pipeline. It is the best product to replace traditional galvanized pipe at present. Known as the green environmental protection pipe. [0003] At present, the connection methods for steel skeleton composite pipes at home and abroad are basically flange bolt connection and electric melting sleeve connection, but the above connection methods have the following defects, as follows: [0004] ①Flange connection [0005] 1. It cannot be used for buried piping systems; 2. The connectin...

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Problems solved by technology

This design has the following defects: firstly, the connection part is not stable enough, especially when the injection pressure and temperature are difficult to control during pipe production, the plastic connecting body and the pipe body are prone to detachment; secondly, this structure makes it difficult for the pipe to stretch and bend during use Due to the force, the installation layout of the pipes is greatly restricted. Again, the shapes of the two ends of the injection-molded steel skeleton composite pipes are different, so it is difficult to adapt to the current pipeline production of pipes, and the production efficiency is low.

[0011] The comparison document CN03237356 discloses a steel frame plastic composite pipe with socket and hot-melt welded joints. This structure has the following defects: 1. Heating wires and terminal posts need to be installed on the inner wall of the hole, which makes the production process complicated and the cost is still relatively high. High; ②Pipe connection stability is greatly affected by the environment. If there is a gap in the connection part (between the socket port and the socket port) during the pipe connection process, the air in the gap will expand during the heating process and easily enter the plastic of the connection part to form air bubbles, making the connection stability greatly affected

③ It is necessary to make the socket port and the socket port at the head and tail of the steel skeleton composite pipe respectively, and the cost is relatively high

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