Process and device for producing continuous lining plastic compound steel pipes

Abstract

The invention discloses a process and a device for producing continuous lining plastic compound steel pipes. The production device sequentially comprises an automatic feeding device, a stepping heating device, a flanging device, a sealing and pressing device and a cooling device in a material conveying direction. The process comprises the following steps: (1) firstly preprocessing the inner walls of galvanized steel pipes; (2) drawing plastic lining pipes into the steel pipes and causing two ends of the plastic lining pipes to extend out of the steel pipes; (3) heating the steel pipes containing the plastic lining pipes to enable temperatures of the steel pipes to reach 150 DEG C-180 DEG C; (4) flanging one section of plastic lining pipes extending out of the steel pipes backwards to enable the section of plastic lining pipes to wrap the steel pipes, namely wrapping the edges of openings of the steel pipes; (5) filling two ends of the steel pipes with compressed air to enable pressure to be 0.5-1.0MPa, and expanding the plastic lining pipes to be close to the inner walls of the steel pipes; and (6) spraying and cooling the surfaces of the steel pipes. By virtue of the process and the device, the production speed is greatly improved; the process and the device are low in production costs and conducive to large-scale continuous production; meanwhile, the lining plastic compound steel pipes produced by the process and the device are good in quality.

Description

technical field [0001] The invention relates to a plastic-lined composite steel pipe, especially a production process and equipment for a continuous plastic-lined composite steel pipe. Background technique [0002] The production process of the original plastic-lined composite steel pipe is to pull the steel pipe into the plastic pipe → seal the pipe heads at both ends with a sealing fixture, and fill it with compressed air, → heat until the hot melt adhesive melts and maintain the pressure inside the pipe, and finally cool and solidify. . The original process is to seal and inflate the steel pipe pulled into the plastic pipe before heating. The pressure in the pipe must be maintained during the heating process. Because the plastic pipe is sealed under heat, the structure of the sealing chuck is required. They must be matched independently and cannot be used universally. If the air pressure is too low during production, the plastic tube will not expand; if the temperature ...

AI Technical Summary

Problems solved by technology

In addition, most of the existing production equipment is semi-automatic, which cannot achieve continuous production, and the production efficiency is low

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