Plastic composite pipe hot melt butt-joint heating heat-sealing composite connecting method

Abstract

The present invention relates to a heat-melting, butt joint and electric-heating melting welding compound connecting method for a plastic composite pipe and pertains to the technical field of pipe connection. The method mainly comprises the technique processes: firstly, an electric-heating melting pipe fitting is pre-sleeved with a pipe I, then the pipe I sleeved with the electric-heating melting pipe fitting is hot-melted and butt jointed with two ends of a pipe II, and the height of the external surface of a butt joint welding seam of a joint become the same as that of the surfaces of the pipe I and the pipe II after treatment. The electric-heating melting pipe fitting is upwardly pushed by the pipe I to the joint between the pipe I and the pipe II after cooling, and the butt joint welding seam of the joint between the pipe I and the pipe II is positioned in the middle of the electric-heating melting pipe fitting, and finally the electric-heating melting welding is carried out. The compression strength and the sealing performance of a pipeline, by adopting the method of the present invention, are commonly supported by the pipes and the pipe fittings, the role in dual guaranteeing is played, and the strength and the sealing performance of the pipeline are all greatly enhanced.

Description

technical field [0001] The invention relates to a connection method between pipe materials. It belongs to the technical field of pipe connection. Background technique [0002] According to different uses, the plastic pipes for conveying media mainly include plastic pipes and plastic composite pipes reinforced with metal skeletons. Corresponding to the two kinds of pipes, there are also two connection methods between pipes: hot-melt butt joint and electrothermal fusion. [0003] 1. Hot-melt butt joint [0004] The plastic pipe is made of pure plastic, and the pressure-resistant and sealing performance of this type of pipe is guaranteed by the wall thickness of the pipe itself, such as D 500 P n 1.6MPa, the minimum wall thickness of PE pipe is 45.5mm. Therefore, the connection and installation between such pipes can be guaranteed only by hot-melt butt joint, as shown in Figure 1. If welding with electric melting pipe fittings, the strength requirements of electric meltin...

AI Technical Summary

Problems solved by technology

The sealing treatment will bring some disadvantages: an additional process is added to the production line in the factory; the broken pipe needs to be sealed according to the actual length requirements on the field site; the sealing operation tool in the field can only use portable equipment, and the working environment is also fluctuating. It is not controlled by humans, so it is difficult to guarantee the quality of plugging

This puts forward higher requirements on the quality of the electrothermal fusion socket fittings and the quality of the operators, and the compressive strength and sealing performance on the pipeline cannot be effectively guaranteed.

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