D-shaped spiral corrugated pipe
A technology of spiral corrugated pipe and inner pipe, which is applied in the direction of hose, pipe, pipe/pipe joint/pipe fitting, etc., can solve the problems of low support strength, decreased strength of corrugated pipe, decreased strength of inner polyethylene layer, etc., so as to improve the support Strength and pressure bearing capacity, large bearing capacity, and the effect of reducing pressure
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Embodiment 1
[0010] Embodiment 1: with reference to attached Figure 1-2 . A D-shaped spiral corrugated pipe, which includes an inner tube 1, a metal tube 2 wound on the body of the inner tube 1 has a D-shaped cross section, and the bottom surface of the D-shaped metal tube is combined with the body of the inner tube 1, and the D-shaped metal tube The pipe surface of the pipe 2 is covered with a plastic layer 3 . The bottom surface of the D-shaped metal tube 2 has an opening structure 4 . A plurality of through holes 5 are opened on the semicircular surface of the D-shaped metal tube 2 and the through holes 5 are in the shape of an inner trumpet. The opening refers to the opening 4 in the length direction of the D-shaped metal pipe. The D-shaped metal pipe 2 is made of steel strip.
Embodiment 2
[0011] Example 2: On the basis of Example 1, a method for manufacturing a D-shaped spiral corrugated pipe, using a metal pipe making machine to make a steel strip into a semicircular D-shaped metal pipe with an opening plane at the bottom, and then using the applicant In the production line of the large-diameter polyolefin winding growth pipe produced by the corrugated pipe inner pipe 1, while making the corrugated pipe inner pipe, the semicircular D-shaped pipe is wound on the corrugated pipe, and the plastic on the wall of the corrugated pipe is embedded in the semicircular D-shaped pipe. In the opening of the pipe, the large-diameter polyolefin winding growth pipe production line manufactured by the applicant is finally used to compound the molten plastic on the semicircular D-shaped pipe. The semicircular surface of the D-shaped metal pipe 2 is pressed into a concave-convex and uneven surface by a mold, and an inner trumpet-shaped through hole 5 is opened in the center of t...
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