Composite steel pipe with plastic tape winded externally and plastic coated internally, and its processing method

Abstract

The invention provides a composite steel pipe which is wound with a plastic tape on the outer wall and sprayed and coated with plastics on the inner wall; the outer wall of the composite steel pipe is provided with a plastic tape winding layer, and the inner wall thereof is provided with a plastic coating layer. A processing method comprises: A. the steel pipe is placed on a roller wheel bracket to rotate, and the inner and the outer walls of the steel pipe are cleaned by spraying sand; B. the steel pipe is placed on the roller wheel bracket to rotate and preheated to 160-180 DEG C; C. the steel pipe is placed on the roller wheel bracket to rotate and is thermally wound with the plastic tape winding layer of 3-5mm at the outer wall; D. the steel pipe is placed on the roller wheel bracket to rotate and is sprayed and coated with the plastic coating layer on the inner wall by utilizing the excess heat of the steel pipe. The invention can form commercial process scale only by using the existing plastic tape extrusion equipment as well as adding two roller wheel brackets and a set of spraying equipment, and can produce any clad pipe having the diameter within the range of 300mm-3000mm. As the outer wall of the steel pipe is wound with PE material which is hard wearing and shockproof, and the inner wall is sprayed with polyurea material that is environment-friendly and has stable performance, the composite steel pipe has good antiseptic property, and the outer wall has very high damage resistance, thus being safe and environment-friendly and greatly improving the production efficiency and the combination property.

Description

technical field [0001] The invention relates to a composite steel pipe with an outer wall wrapped with plastic and an inner wall sprayed with plastic and a processing method thereof, belonging to the technical field of steel pipe anticorrosion processing and equipment. Background technique [0002] At present, large-diameter steel pipes are used in long-distance water transportation, gas transportation, mine and chemical transportation materials, cement mortar and other corrosive and impactful materials. It is mainly necessary to solve the problems of corrosion resistance, wear resistance and impact resistance. Composite steel pipes include plastic-sprayed composite pipes on the inner and outer walls, composite pipes coated with plastic on the inner and outer walls, composite pipes coated with asphalt on the outer wall, and cement-lined composite pipes on the inner wall. It is easy to solve the anti-corrosion of pipes, but it is not easy to solve the wear-resistant and impac...

AI Technical Summary

Problems solved by technology

[0002] At present, large-diameter steel pipes are used in long-distance water transportation, gas transportation, mine and chemical transportation materials, cement mortar and other corrosive and impactful materials. It is mainly necessary to solve the problems of corrosion resistance, wear resistance and impact resistance. Composite steel pipes include plastic-sprayed composite pipes on the inner and outer walls, composite pipes coated with plastic on the inner and outer walls, composite pipes coated with asphalt on the outer wall, and cement-lined composite pipes on the inner wall. It is easy to solve the anti-corrosion of pipes, but it is not easy to solve the wear-resistant and impact-resistant problems of pipes by spraying or coating plastics, and has high requirements on processing conditions, such as spraying, polyurethane, etc. There are strict requirements, a little improper operation will produce waste products, and the processing cost is relatively high

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