Convenience steel pipe plastic coating system for once curing in inner and outer spraying

Abstract

The invention relates to a convenience steel pipe plastic coating system for once curing in inner and outer spraying. The system comprises a horizontal conveying frame, a steel pipe conveying frame, an inner spraying system, an outer spraying system and a high-temperature curing furnace; the horizontal conveying frame conveys steel pipes from a preheating furnace to the inner spraying system; theinner surfaces of the steel pipes are sprayed in the inner spraying system; the horizontal conveying frame conveys the steel pipes to a transporting frame; the transporting frame supports and hangs the steel pipes to the steel pipe conveying frame; and the steel pipes are transported to the outer spraying system for outer spraying. Spraying-uniform steel pipe outer plastic coating equipment is provided with an imaginary air blowing rod on the upper surface for preventing outward splashing of dust; and negative pressure is generated in a box on the lower bottom surface of the plastic coating equipment for negative-pressure absorption of the powder to further prevent leakage of the powder so as to maintain cleanness of operation space.

Description

technical field [0001] The invention belongs to the field of plastic coating of steel pipes and relates to a convenient plastic coating system for steel pipes which can be cured once by internal and external spraying. Background technique [0002] Plastic-coated steel pipe is a steel pipe formed by melting a layer of polyethylene resin, ethylene-acrylic acid copolymer, epoxy powder, non-toxic polypropylene or non-toxic polyvinyl chloride with a thickness of 0.5-1.0mm on the inner or outer wall of the steel pipe. The plastic composite pipe has the advantages of high strength, easy connection, and resistance to water impact. [0003] There is an existing plastic-coating technology for steel pipes. The plastic-coating method is to place the heated steel pipe on a pair of rollers, drive the rotation of the steel pipe through the rotation of the rollers, and then evenly sprinkle hot-melt powder on the steel pipe, and the powder falls to the surface of the steel pipe. When the st...

AI Technical Summary

Problems solved by technology

The technicians fixed a load-bearing pile between the two rollers, trying to use the load-bearing pile to share the pressure on the two rollers. The load-bearing pile is too short to touch the outer wall of the steel pipe, or the load-bearing pile is too high to make the steel pipe unable to contact the two stick shafts

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