Pipe end flange of steel-frame reinforced composite plastic pipe and method for fabricating same

Abstract

The invention relates to a tube flange of steel skeleton strengthen composite plastic tube, wherein the tube flange is formed by the plastic composite tube strengthened by steel skeleton and one plastic flange fused connected to the outer taper surface and end surface of composite tube or tube end; said plastic flange has one inner wall matched with the taper of outer taper surface of composite tube and one step surface fused connected to the end of composite tube; said inner wall and the step end contact the outer taper surface and the end surface of composite tube, to generate rotation friction, while their friction contact surfaces are heated fused; the generated fused matter will connect the inner wall and the step end surface with the outer taper surface and the end surface, to integrate them. The invention has high reliability, simple construction, high bearing pressure and wide application.

Description

Technical field: [0001] The invention relates to a pipe end flange, in particular to a pipe end flange for a metal skeleton with holes and a steel skeleton reinforced composite plastic pipe and a manufacturing method thereof. Background technique: [0002] The metal skeleton with holes is used as the reinforcement, and the composite polymer material is extruded on the skeleton as a continuum to cover the skeleton to form a steel-plastic composite pipe, or the inner and outer plastic pipe walls can be designed as different polymer materials according to engineering needs The inner and outer plastic pipe walls and the metal skeleton, especially through the holes of the metal skeleton and the adhesive layer, are firmly combined with each other. The steel skeleton reinforced composite plastic pipe has been mass-produced and used. This kind of pipe is It has the higher pressure bearing capacity of metal pipes, and because it has plastic inner and outer walls and connects the inne...

AI Technical Summary

Problems solved by technology

However, at present, the connection between the pipe fittings and the pipes is based on the electric heating wire laid on the inner wall of the socket of the polymer pipe fittings to make the polymer fusion connection between the pipe fittings and the outer circle of the pipes through electric heating to form a permanent connection. This traditional connection method has the following defects : First, due to the arrangement of heating wires on the inner wall of the pipe fitting socket, the manufacture of pipe fittings is extremely complicated and technically difficult. Due to equipment or operation errors, the qualified rate of finished pipe fittings is often reduced. Second, pipe fittings and pipes are connected at the construction site. Complicated electric heating equipment and high personnel operating skills can ensure that the socket of the pipe fittings and the outer circle of the pipe are completely connected by polymer fusion, especially for the connection of steel skeleton reinforced composite plastic pipes with metal skeletons with holes. The metal frame needs to absorb a lot of heat, so it is necessary to use the electric heating wire to heat the connection part for a long time, so that the composite pipe end and the pipe fitting (or flange) accumulate a lot of heat, and the cooling shrinkage is also large. During the cooling shrinkage process It is very easy to cause tearing, separation and delamination between the metal skeleton and the inner and outer plastics, between the outer plastic of the composite pipe and the pipe fittings, and between the plastic and the heating wire, seriously affecting the connection quality

Third, because the traditional connection method between pipe fittings and pipes can only produce polymer fusion connection at the interface between the socket of the pipe fittings and the outer circle of the pipe, it cannot solve the problem that the end face of the steel skeleton reinforced composite plastic pipe must be sealed to prevent the steel skeleton from being exposed. The problem of skeleton corrosion and separation and delamination from the plastic pipe wall, in the past, a sealing process had to be added to the production of steel-plastic composite pipe, that is, the sealing ring was made with an injection molding machine, and then the sealing ring was bonded to the end surface of the steel-plastic composite pipe with an electric heating plate. Hot melt sealing is connected, and the inner and outer circles of the sealing surface must be cut and polished, or the end of the composite pipe is put into the injection molding machine, and a sealing head is extruded at the end of the composite pipe. The defect of this method is that the melting The extruded sealing head cannot be completely hot-melt connected with the end of the composite pipe at room temperature. During construction or long-term use, it is easy to cause separation and delamination of the sealing head and the end of the composite pipe, and corrosive media pass through the metal at the end of the pipe. The interface between the skeleton and the polymer penetrates into the metal skeleton, corrodes the metal skeleton, and then penetrates the plastic outer layer on the metal skeleton to cause the pipeline to fail, thus causing the failure of the entire pipeline system

[0003] At present, the ends of aluminum-plastic composite pipes commonly used in the market are not sealed. In long-term use, the conveying medium will corrode the exposed metal, causing separation and delamination of metal and plastic, and the corrosive medium will pass through the metal skeleton at the end of the pipe and aggregate The interface of the substance penetrates into the metal skeleton, further corrodes the metal skeleton, and then breaks through the plastic layer on the metal skeleton to make the pipeline invalid, thus causing the entire pipeline system to fail.

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