Polyurethane thermal insulation composite tube and forming device thereof

Abstract

The invention relates to the technical field of polyurethane thermal insulation materials, in particular to a polyurethane thermal insulation composite tube. The polyurethane thermal insulation composite tube comprises an inner tube, wherein the outer wall of the inner tube is evenly covered with an anti-corrosion layer; the inner tube is sleeved with an outer tube; a polyurethane insulation coating is filled between the anti-corrosion layer on the outer tube and the anti-corrosion layer on the inner tube; the outer tube is wrapped with a thermal insulation layer. A forming device of the polyurethane thermal insulation composite tube comprises a foaming extrusion machine head, wherein a round hole matched with the diameter of an inner tube is formed in the middle of the foaming extrusion machine head, the foaming extrusion machine head is rotationally sleeved with an outer tube extrusion machine head, and a spraying box is arranged at one side of the tail end of the foaming extrusion machine head. By means of the matching structure of the foaming extrusion machine head and the outer tube extrusion machine head, the inner tube can penetrate through, meanwhile, wrapping and covering of the outer tube and filling of the polyurethane insulation coating are conducted, the inner tube, the polyurethane insulation coating and the outer tube are synchronously formed in a section of area, higher efficiency is achieved, and the integrity of the tube is higher after the tube is formed.

Description

technical field [0001] The invention relates to the technical field of polyurethane thermal insulation materials, in particular to a polyurethane thermal insulation composite pipe and a forming device thereof. Background technique [0002] Polyurethane insulation pipe is made of high-functional polyether polyol composite material and polymethyl polyphenyl polyisocyanate as raw materials through chemical reaction foaming. Polyurethane insulation pipes are used in various indoor and outdoor pipelines, central heating pipelines, central air-conditioning pipelines, chemical, pharmaceutical and other industrial pipelines for heat preservation and cold preservation projects. Overview Since the birth of polyurethane synthetic materials in the 1930s, polyurethane foam insulation pipes have been rapidly developed as an excellent thermal insulation material, and its application range is becoming wider and wider. It is widely used in various pipelines such as heating, cooling, oil tra...

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Problems solved by technology

[0005] (1) Although the processing of the inner tube, polyurethane layer and outer tube is a continuous production line, it is formed through three stages of processing, and each stage is processed to be relatively stable before combined processing. Not only the processing efficiency is low, but it will also cause The integrity of the pipe is reduced

[0006] (2) The plastic pipe is covered with polyurethane insulation layer after spray cooling and blast drying. At this time, since the plastic pipe has been formed stably, this will weaken the bonding force between the polyurethane insulation layer and the plastic pipe, resulting in During the later use, the polyurethane insulation layer and the plastic pipe become loose and detached, reducing the insulation effect

[0007] (3) When the polyurethane foam layer is formed, it is injected from the side of the outer wall of the inner tube through the high-pressure mixing gun head, and the polyurethane foam material is pushed and squeezed to cover the outer circumference of the inner tube, but the polyurethane foam material is discharged after injection. Will solidify quickly, which will lead to uneven distribution of polyurethane foam material, resulting in unstable insulation effect

[0008] (4) The outer tube of the polyurethane thermal insulation composite tube has a certain degree of flexibility when it is not completely fixed at the initial stage of forming, and there is a risk of distortion and deformation if it is directly pulled

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