Plastic steel composite pipe hot-melt connection method

Abstract

The invention discloses a plastic steel composite pipe hot-melt connection method. The method comprises (1) inserting a plastic steel composite pipe into the socket of a hot-melt pipe fitting, the plastic steel composite pipe and the socket of the hot-melt pipe fitting being in clearance fit; (2) fitting an electromagnetic induction heater at the connection position of the plastic steel composite pipe and the hot-melt pipe fitting; (3) powering on the electromagnetic induction heater so that the metal layer of the plastic steel composite pipe generates heat under the action of the electromagnetic induction heater, until the inner and outer plastic layers of the plastic steel composite pipe and the socket of the hot-melt pipe fitting are in hot-melt connection, and powering off the electromagnetic induction heater; and (4) cooling the plastic steel composite pipe and the hot-melt pipe fitting. The inventive plastic steel composite pipe hot-melt connection method is reliable in connection, good in sealing property and convenient to operate, and saves materials.

Description

technical field [0001] The invention belongs to the technical field of connection of plastic-steel composite pipes, in particular to a hot-melt connection method of plastic-steel composite pipes. Background technique [0002] The existing steel-plastic composite pipe has two connection methods, one is electric hot-melt connection, and the other is hot-melt connection. [0003] The steel-plastic composite pipe and the pipe fittings connected by electrothermal fusion adopt clearance fit, and the resistance wire is pre-embedded at the installation position of the pipe fitting. The wire heats up and melts the connection parts of the pipe and pipe fittings, so as to achieve the purpose of connection. The advantage of this connection method is that it is less affected by the environment and human factors, and the connection is safe and reliable. However, due to the long-term use of the steel-plastic composite pipe, the connection end surface cannot touch water, and the method of ...

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Problems solved by technology

[0007] 3. Pipes and pipe fittings are heated by heating plate, the temperature of heating plate is above 220℃, which may easily cause burns to operators;

[0008] 4. The temperature of the heating plate is greatly affected by the ambient temperature and wind force, which increases the construction difficulty of the operator;

[0009] 5. The heating plate tool is relatively large, and the installation operation is affected at the corner of the corridor or the pipe well;

[0010] 6. If the pipeline is laid along the top of the wall, the installation is more inconvenient, which may cause poor welding, so that leakage will occur within a short period of system operation, causing heavy losses to users

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