A kind of manufacturing method of double-flat-wall steel-plastic composite pipe

Abstract

A double-flat wall steel-plastic composite pipe comprises a plastic-steel twined pipe substrate and a plastic layer which are sequentially twined from the inner layer to the outer layer, wherein at least two I-shaped strengthening ribs and at least one T-shaped strengthening rib are arranged on the outer side of the plastic-steel twined pipe substrate; narrow grooves matched with the I-shaped strengthening ribs are formed on the inner surface of the plastic layer; wide grooves matched with the T-shaped strengthening rib are formed on the two side edges of the inner surface of the plastic layer; the plastic layer is formed by clockwise twining and overlapping a plastic strip on the outer surface of the plastic-steel twined pipe substrate and performing hot melt welding. The invention further provides a manufacturing method of the double-flat wall steel-plastic composite pipe. The double-flat wall steel-plastic composite pipe is a liquid conveying pipe which has high ring stiffness and low material consumption, can bear an internal pressure, has good sanitation performance, and has a long service life and better overall capacity.

Description

technical field [0001] The patent of the invention relates to a double-flat-wall steel-plastic composite pipe and its manufacturing method, which is a large-diameter steel-plastic composite pipe, and the pipe is mainly used in the field of liquid transportation. Background technique [0002] At present, polyethylene plastic pipes have been widely used in domestic water supply pipelines. The characteristics of this pipe are very prominent, with long service life and excellent corrosion resistance. In addition, no heavy metal salt stabilizers are added to polyethylene pipes during processing, and the material is non-toxic. In addition, it It will not promote the growth of algae, bacteria or fungi, which better solves the problem of secondary pollution of drinking water in cities and towns, and has good hygienic performance. Because it is an all-plastic pipe, when meeting the operating pressure and resisting external pressure (ring stiffness), the wall thickness of the pipe is ...

AI Technical Summary

Problems solved by technology

At present, the large-diameter drainage pipes on the market are almost all steel-plastic composite products. These steel-plastic composite drainage pipes are mostly non-pressure structure pipes, and they all have sufficient ring stiffness to support the external load of the soil and ensure long-term safe use. However, they cannot be used as Used in pipelines for conveying liquid under pressure

[0004] As far as the applicant knows, the current double-flat-wall steel-plastic composite pipe is usually compounded by heat-coating to form the outer flat wall, that is, the molten plastic is directly extruded on the outside of the spirally wound pipe, such as Figure 7 As shown, in this process, there are the following problems. First, the thickness of the outer plastic layer is uneven. Second, the contact range of the joint surface between the two is small, and the joint between the two is easy to crack, which affects the quality of the project and the use of pipes. life

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