Metal framework reinforced plastic composite pipes and method for manufacturing the same

Abstract

The invention provides a metal skeleton reinforced plastic composite pipe which is provided with a pipeline connecting piece which can connect a pipeline with another pipeline or the pipeline with a pipeline joint to form a pipe network in satisfying the working pressure. The end of the pipeline connecting piece connected with the metal skeleton reinforced plastic composite pipeline is provided with an annular U-shaped bell and spigot hole which totally wraps the plastic external layer and the plastic internal layer of the end of the metal skeleton reinforced plastic composite pipeline and the end surface of the metal skeleton reinforced plastic composite pipeline; and the pipeline connecting piece is connected with the metal skeleton reinforced plastic composite pipeline in a hot melting way or electric melting way. The annular U-shaped bell and spigot hole of the pipeline connecting piece totally and tightly wraps the plastic external layer and the plastic internal layer of the end of the metal reinforced composite pipeline and the end surface of the metal skeleton reinforced plastic composite pipeline, the connection is firm and reliable without leakage, the connection position has high mechanical strength and prevents fluid from entering into a metal skeleton to corrode the metal skeleton, and the service life of the pipeline is long. The invention further provides a method for manufacturing the metal skeleton reinforced plastic composite pipe.

Description

Technical field: [0001] The invention relates to a metal skeleton reinforced plastic composite pipe and a manufacturing method thereof. Background technique: [0002] The known metal-composite plastic pipes are connected by mechanical clamping method, such as aluminum-plastic composite pipes, and the electric heating wires distributed in the inner cavity of the socket of the pipe fitting connector are used to electrically heat the cylindrical connection surface or taper of the pipe and pipe fittings. The connection surface makes the two sides melt and connect, and there is also a method of thermally melting the conical surface between the pipe and the pipe fitting together with the stepped end surface of the pipe fitting cavity by using the method of rotating friction to generate heat and melt connection, such as patent application number 200510021077. 03225501, this patent discloses a heat-melt connection structure of aluminum-plastic composite pipes, and there is also pate...

AI Technical Summary

Problems solved by technology

Because the pipe wall and the inner cavity surface of the pipe connector are both conical surfaces, the hot melt on the corresponding conical surface when they are heated and socketed is extruded instead of pushed out of the connecting surface, so there is not only enough melt, but also enough They are well welded to each other, but there are still weak links between the metal skeleton of the pipe end face and the plastic inner layer and the end of the plastic pipe fittings, especially when the metal composite plastic pipe is used in harsh environments, such as hot water transportation, but due to the metal There is an order of magnitude difference in the thermal linear expansion coefficient of the two materials and the plastic, and the long-term alternating heat and cold will cause cracks between the plastic and the metal skeleton at the weak link of the connection due to thermal expansion and contraction, and the sealing requirements cannot be met.

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