A two-layer or multi-layer wear-resistant and impact-resistant pipe and its preparation method

Abstract

The invention provides a two-layer or multi-layer wear-resistant and impact-resistant tube, the wear-resistant and impact-resistant tube includes: an outer layer protection tube (1) and an inner layer wear-resistant composite tube (2), and the inner layer is resistant to The grinding combined pipe (2) is nested in the outer protective pipe (1), and the inner wear-resistant combined pipe (2) is composed of two or more pieces of pipe walls, and the two or more pieces of pipe walls Spliced ​​together to form a tubular body with a ring-shaped cross section. The wear-resistant and impact-resistant pipe of the present invention can be a straight pipe or a bent pipe. In the case of straight pipes, the upper and lower parts of the inner wear-resistant composite pipe adopt heterogeneous structures; in the case of curved pipes, the large and small bends of the curved pipes adopt heterogeneous structures. In a word, the inner composite pipe of the wear-resistant and impact-resistant pipe of the present invention is divided into at least two parts, and at least the two parts are heterogeneous. Adopting the structure of the pipe body of the present invention can prolong its service life, enhance wear resistance and impact resistance, and reduce the total weight of the pipe body.

Description

technical field [0001] The invention relates to a conveying pipe structure applied in the fields of construction, mining, metallurgy, electric power, petroleum, coal, grain processing and the like, in particular to a two-part or multi-part double-layer wear-resistant and impact-resistant pipe and a preparation method thereof. Background technique [0002] The forming technologies of pipes mainly include casting molding, molding, etc., which are all formed by molding molds, through casting or hot-cold pressing process; no matter what kind of machinery and equipment and pipes, most of them use pipes. Mainly used for oil, gas, liquid, powder, etc.; pipeline materials include cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals and plastics; in construction, mining, metallurgy, electric power, petroleum, In coal, grain processing and other industries, the transportation of materials is carried out by pipeline pressure, and the transporta...

AI Technical Summary

Problems solved by technology

[0003] At present, the most widely used pipes are single-layer high manganese steel pipes, and double-layer high-chromium cast iron pipes are also used in a small number of cases; single-layer high-manganese steel pipes have poor wear resistance, low hardness, and low safety; the cost of double-layer wear-resistant pipes High, good quality, excellent wear resistance, high hardness, high safety, but not cost-effective

[0004] Chinese patent CN203023710U discloses a wear-resistant elbow; the wear-resistant elbow includes a body, and further includes a polymer elastomer layer arranged in the body, and the thickness of the polymer elastomer layer is within the thickness of the bend. The thickness of the tube is 3-15 mm in the middle section and 2-10 mm at the ends of said bend; Easy to wear, the polymer layer is easy to peel off under the scouring of the fluid, etc.

[0006] If the second inner curved part of the curved pipe adopts a half-pipe design, there will be a big problem in the installation firmness of the first outer curved tubular part and the second inner curved part, and at the same time the second inner curved part is an extension part. The problem of poor wear resistance; if the second inner curved part adopts a complete tube design, then the second inner curved part is made of the same material, which causes waste of material and affects economic efficiency

[0007] Therefore, the existing pipe fitting preparation methods and corresponding pipe fittings have high cost, poor wear resistance and short service life.

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