Plastic pipe connecting method

Abstract

The invention relates to the technical field of pipe connection. A technical problem to be solved is to provide a plastic pipe connecting method, by which connection is firm and reliable, the sealing performance is good and the service life is prolonged. The plastic pipe connecting method comprises the following steps: treating end parts, butting by hot melting, cool for the first time, butting by electric melting, cooling for the second time, performing two-time injection moulding, cooling for the first time and flattening a surface. Through hot melting butting, electric melting butting, two-time injection moulding and three different processes, electric melting sleeves and two pipes are fused, connected and strengthened, and the sealing performance of a whole pipe system and the structural strength after connection can be borne by a hot melting butting area, an electric melting fusing area and a two-time injection moulding area together, so that a triple sealing, strengthening and protecting effect is achieved, and the safety and the reliability of the whole pipe system can be greatly improved, therefore, the service life of the whole pipe system is prolonged.

Description

technical field [0001] The invention relates to the technical field of pipe connection, in particular to a method for connecting plastic pipes. Background technique [0002] In the prior art, plastic pipes can obtain firm and reliable pipe joints by means of fusion connection (the main fusion connection methods are: electric fusion connection and thermal fusion connection). The physical process of the fusion connection is: heating the plastic pipe to a certain degree, the molecular chains that were originally tightly arranged melt and fork, and when the temperature drops, the molecular chains are reconnected so that the two connected parts are combined into a whole. Because it is the body welding between the plastic pipes, the strength of the joint is the same as that of the pipe itself, and part of the strength may even exceed the body strength of the pipe. In pipe construction, connection technology is the key to the quality of its installation project. The quality of con...

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Problems solved by technology

[0003] The patent with the application number 02114008.1 discloses a self-compressing electric hot-melt connection method for plastic pipes, which is mainly through reaming the plastic connecting sleeve to assemble with the connected pipe, and then using the expanded connecting sleeve to produce Heat shrinkage, so that the connection layer between the sleeve and the pipe is subjected to uniform pressure, and then the electric heating wire of the connection layer is energized to heat, so that the plastics on the connection layer are fused together, thereby realizing the fusion connection between the pipe fittings. Due to this connection method It is necessary to use a tapered mandrel to ream the inner hole of the connecting sleeve through a jack or other pressure tools, so the human influence factor is very large during the operation, and the connecting sleeve is forced to be reamed by jacks and other pressure tools. The strength performance of the sleeve and the smoothness of the inner surface will cause a certain degree of damage, and when the jack or other pressure tools are removed, the connecting sleeve will be subject to a large shrinkage recovery force, so that the electrofusion sleeve may be damaged. great reverse deformation

When the deformation is too large, it will seriously affect the airtightness, reliability and safety of the pipeline system after assembly and electrofusion fusion, and bury safety hazards for the use of the entire pipeline system

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