Continuous production equipment of steel-plastics composite pipe whose internal and external surfaces of holed steel skeleton are coated with adhesive

Abstract

The continuous production equipment of steel plastic composition pipe with perforated steel skeleton whose inside and outside surfaces are coated with adhesive includes forming sizing welding mechanism, extrusion combination mechanism and sizing cooling forming mechanism which are arranged in turn, and it is characterized by that before extrusion combination mechanism an adhesive extrusion coating mechanism capable of melt-extruding coating adhesive onto inside surface and outside surface of the cylindrical steel skeleton by means of its bores is added, and said adhesive extrusion coating mechanism has the components of mould cover, hollow core mould, hollow core shaft, forming mould cavity and adhesive flow channel, etc.

Description

Technical field: [0001] The present invention relates to a kind of metal frame with holes as a reinforcing body, a production device for extruding composite materials on the inner and outer surfaces of the frame to form metal frame-reinforced plastic composite pipes, in particular to extruding composite pipes on the surface of a metal frame with holes A production side device for pre-extruding plastic composite pipes coated with an adhesive layer before the object material. Background technique: [0002] There are many existing methods and devices for the production technology of steel-plastic composite pipes that use a metal skeleton with holes as a reinforcement, and extrude composite polymer materials on the skeleton as a continuum to wrap the skeleton into a steel-plastic composite pipe, as well as corresponding patents. 的报道和公开,如英国专利GB2255、148A92.10.28,中国专利申请号94104509.9、申请号98119383.8、申请99232026.7申请号99232162.X和99232214.6申请号99114790.1申请号00222720.7和00132035.1申请号99112221.6申请号...

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Problems solved by technology

[0004] In the prior art, there are reports about coating the inner and outer walls of steel pipes or aluminum pipes and steel pipes with an adhesive layer and then extruding the polymer layer or bonding the finished polymer pipe with the adhesive layer to form a composite pipe. However, this kind of composite pipe is different from the metal skeleton with holes and the composite pipe of the polymer. This kind of composite pipe combined with the metal pipe without holes has good pressure bearing capacity and strong anti-corrosion ability of the pipeline, but the polymer layer and The linear expansion coefficient of the metal pipe is an order of magnitude different. When used in a heated environment or a cold environment, the polymer layer will be significantly elongated or shortened compared with the metal pipe in the middle layer, so that the metal pipe at the end of the pipe will be exposed and the corrosion protection will fail. In addition, the connection between the pipe fittings and the pipeline is only connected by a thin layer of polymer on the outer layer. Whether it is a hot-melt connection or a mechanical clamp connection, there is no connection strength. For the pipe network, the pressure-bearing capacity and the pipeline pressure-bearing capacity are Not equivalent, the joint is the weakest and not durable, not safe, this kind of pipe is not good in practical application due to the difference in linear expansion coefficient of different orders of magnitude of different materials

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