Polyethylene coating steel pipe and its producing method and production line

Abstract

The invention relates to a steel pipe painted with polythene and manufacturing method and mobile production line. A drum type rust remover, a drum type threading machine, a drum type spray coater, a drum type winding machine, a drum type cooling fan, a drum type dust removing threading machine, and a drum type spray winding machine are connected in turn to form the mobile production line. At a pipe laying site, a steel pipe in turn enters the drum type rust remover, the drum type threading machine, the drum type spray coater, the drum type winding machine and the drum type cooling fan, and makes helical movement under the support of a feeding wheel and a supporting roller in a rotating drum body. The steel pipe is heated through a high-frequency induction heating method, and rust spots are removed from the external surface of the steel pipe through a mechanical method and the steel pipe is threaded also through a mechanical method, the epoxy powder spray coater is used to spray epoxy powder to the external surface of the steel pipe, the epoxy powder and a composite polythene cold adhesive tape are heated indirectly through the high-frequency induction heating method and the cold adhesive tape is turned into a composite polythene hot adhesive tape, and through a mechanical winding method, the composite polythene adhesive tape is applied onto the epoxy powder layer to produce the steel pipe painted with polythene.

Description

technical field [0001] The invention relates to a polyethylene coated steel pipe, a production method and a mobile production line. In the pipeline system of water conservancy, electric power and petrochemical enterprises, the steel pipes erected in the space will be oxidized and corroded due to the contact with air. The steel pipes buried in the ground corrode due to the electrochemical reaction due to contact with the active substances in the ground. This rust or corrosion will shorten the service life of the steel pipe. Therefore, before the steel pipe is installed, it is generally necessary to coat the outer surface of the steel pipe with anti-corrosion and anti-corrosion materials. technical background [0002] In the pipeline system construction of water conservancy, electric power and petrochemical enterprises, the coating of anti-corrosion and anti-corrosion materials on the outer surface of steel pipes has developed from the initial coating of paint and asphalt on...

AI Technical Summary

Problems solved by technology

The medium frequency heating power supply is large in size and heavy in weight, which is not conducive to the mobile use of the polyethylene coated steel pipe production line;

[0017] (4), spray epoxy powder, install 4-6 spray guns outside the outer surface of the steel pipe, and the epoxy powder is sprayed to the outer surface of the steel pipe by the spray gun. Although electrostatic spraying is used, the splash of epoxy powder is still relatively large, which is easy to pollute the environment;

[0020] (7) After the steel pipe is coated with epoxy powder layer, wrapped with adhesive tape and polyethylene tape, the steel pipe still maintains a high temperature, and it is necessary to spray water to replace the heat energy stored in the steel pipe to cool the polyethylene coated steel pipe, which wastes unnecessary heat energy

It not only increases the purchase cost of anti-corrosion equipment, but also consumes a lot of electric energy, increases the auxiliary cost of anti-corrosion coating, and increases the cost of anti-corrosion coating for steel pipes

Polyethylene-coated steel pipes have been transported from the pipeline anti-corrosion factory to the pipeline installation site many times. During the transportation, the polyethylene coating anti-corrosion layer is damaged due to collisions, and the polyethylene coating can only be manually applied to repair the damage at the pipeline installation site. Poor quality hazards are formed in the entire pipeline system; and manual coating, anti-rust and anti-corrosion treatment work environment is poor, and the labor intensity of production workers is high, which is not conducive to safe production, which increases the auxiliary construction time and pipeline installation period

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