Novel prefabricated direct-buried polyurethane spraying heat-preservation pipe production line and production process

Abstract

The invention discloses a novel prefabricated direct-buried polyurethane spraying heat-preservation pipe production line. The production line is composed of a flame preheating furnace, a shot blastingderusting machine, a pipe-inside blowing sweeping device, a polyurethane spraying system, a polyurethane layer rounding device, a polyurethane curing platform, a polyethylene winding system, a coating cooling system and a pipe end treating device which are arranged in proper sequence. The invention further discloses a novel prefabricated direct-buried polyurethane spraying heat-preservation pipeproduction process which comprises the steps of preheating, shot blasting, blowing sweeping, polyurethane spraying, rounding, curing, polyethylene layer winding, coating cooling and pipe end treating.By means of the novel prefabricated direct-buried polyurethane spraying heat-preservation pipe production line and the production process, the problems of uneven internal density, more cavities and detection difficulty of a polyurethane layer in existing heat-preservation pipe fabrication utilizing a pipe-in-pipe process are solved.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation pipes, and in particular relates to a production line and a production process of a novel prefabricated direct-buried polyurethane spray-coated thermal insulation pipe. Background technique [0002] The prefabricated direct buried insulation pipe is composed of steel pipe (working pipe) for conveying medium, polyurethane rigid foam (insulation layer), and high-density polyethylene outer sleeve (outer sheath), because of its low heat loss, anti-corrosion and good insulation performance , fast and safe construction, etc., are widely used in heat preservation and cold preservation projects of central heating pipelines, central air-conditioning pipelines, chemical, pharmaceutical and other industrial pipelines. [0003] At present, production enterprises generally adopt the traditional pipe-in-pipe process to produce prefabricated direct-buried thermal insulation pipes. In this production p...

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Problems solved by technology

[0004] The present invention solves the deficiencies of the prior art and provides a novel prefabricated direct-buried polyurethane spray-coated thermal insulation pipe production line and production process, which avoids uneven internal density of the polyurethane layer, many cavities and difficult detection problem

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