Hot melting connecting method of plastic composite pipe and connecting device used by same

Abstract

The invention relates to a hot melting connecting method of a plastic composite pipe and a connecting device used by the same. The hot melting connecting method adopts a hot melting socket connectingmode, and comprises the following steps: presetting the pipe mouth inside diameter of one section of plastic composite pipe at a connected end to be equivalent to the pipe mouth outside diameter of the other section of plastic composite pipe; when in connection, heating the outer surface of a minor-caliber pipe mouth and the inner surface of a major-caliber pipe mouth at the connecting end of twosections of composite pipes to be in a fusing state; and removing a heating device, socketing heating surfaces of two sections of composite pipes together and connecting two sections of composite pipes after cooling. The connecting device is sequentially provided with a fixed clamp group, an inner surface hot melter, an outer surface hot melter and a movable clamp group in the same axial directionof clamping the plastic composite pipeline, wherein the fixed clamp group and the movable clamp group are respectively fixed on a plunger piston connecting rack of a hydraulic plunger piston system and an oil cylinder connecting rack, and the inner surface hot melter and the outer surface hot melter are respectively fixed on front side and the back side of a heating plate and fixed together on asuspended movable bracket together. The hot melting connecting method and the connecting device have the advantages of realizing the connection in the flaring and hot melting socket modes, having convenient operation, reliable connection, easy processing and low connecting cost, being suitable for connection of buried pipelines and other long pipelines and particularly according with the connecting requirements of plastic composite pipelines of steel wire frames with the pressure less than 1.6Mpa.

Description

technical field [0001] The invention relates to plastic pipes, in particular to a hot-melt connection method for plastic composite pipes and a used connection device, especially suitable for the connection of steel wire skeleton plastic composite pipes below 1.6Mpa. Background technique [0002] At present, the known connection methods of engineering plastic pipes are mainly electrofusion direct connection and electrofusion plastic flange connection. The above two connection methods use the heat generated by the resistance wire to fuse the pipe and pipe fittings together. There is a possibility of welding defects such as shotcrete on the fusion surface. In addition, electrofusion direct connection and electrofusion plastic flange connection have many processing procedures, complicated process and high cost, which are not conducive to the competition of products in the market. Contents of the invention [0003] In order to improve the connection performance of plastic pip...

AI Technical Summary

Problems solved by technology

There is the possibility of welding defects such as shotcrete on the fusion surface

In addition, the electrofusion direct connection and electrofusion plastic flang

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