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.