Production method of steel-plastic composite pipe

Abstract

The invention relates to a production method of a steel-plastic composite pipe, belonging to the field of steel-plastic composite pipes. The production method of the steel-plastic composite pipe is characterized by comprising the following steps of: under the traction of a traction apparatus, carrying out rust removal on a steel belt through a steel belt rust removal device and drying, and then placing the steel belt into a coating mould of an inner plastic coating layer extruder; under the traction of the traction apparatus, pressing the cooled and formed steel belt on a strip to obtain the waveform of a designed structural wall pipe; under the action of a tractor, placing the waveform-pressed steel belt into an extruder mould and forming a plane layer plastic which covers trough of the steel belt at the inner layer of the steel belt; placing the steel belt into a bending device and lapping and welding the steel belt with the edge of the coating strip; coating the weld joints by using inner and outer weld joint coating extruders; and cutting to obtain the finished pipe. In the traditional steel belt strengthened polyethylene helically corrugated pipe, steel belts are mot continuously strengthened in the longitudinal direction; and through continuous welding, the helically corrugated pipe can be strengthened by the steel belts in the longitudinal direction, so that the problem of low longitudinal tension resistance of the original products is eliminated.

Description

technical field [0001] The invention relates to a production method of steel-plastic composite pipes, belonging to the field of steel-plastic composite pipes. Background technique [0002] Steel pipe has high strength, but it is heavy and easy to corrode, so the cost of transportation and installation is high, and its service life is short. Plastic pipe has the advantages of light weight and corrosion resistance, but its strength is low. Although increasing its wall thickness can make up for its shortcoming of insufficient strength within a certain range, this will increase the production cost on the one hand, and reduce the fluid transported by the pipe on the other hand. cross-sectional area. So people invented the steel-plastic composite pipe, adding steel wire, steel strip or perforated steel plate inside the plastic to increase the strength of the pipe. There are many ways to realize steel-plastic composite, and the structure forms are different, but these pipes all h...

AI Technical Summary

Problems solved by technology

[0003] (1) The longitudinal tensile strength of the pipe is low

[0004] The reinforcement layer is discontinuous in the longitudinal direction of the pipe. Although the reinforcement layer is very effective in increasing the ring stiffness and hoop strength of the pipe, in the longitudinal direction, because the reinforcement layer is not continuous, the low-strength plastic has not been longitudinally reinforced, and the pipe has longitudinal stability. low sex problem

When the pipe is installed in a vertical or inclined place, it is easy to be broken

[0005] (2) Low peel strength between steel reinforcement layer and plastic

In this way, the peel strength between the steel reinforcement layer and the plastic layer is very low. When the temperature difference stress is generated, this very low peel strength cannot withstand the temperature difference stress, resulting in the separation of the steel reinforcement and the plastic. Even the plastic falls off, the strength of the pipe is greatly reduced, and water and air can easily penetrate into the gap after the steel reinforcement is separated from the plastic, causing corrosion of the steel reinforcement

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