Forming device for polyurethane thermal insulation composite pipe

Abstract

The invention relates to the technical field of polyurethane thermal insulation materials, in particular to polyurethane thermal insulation composite pipes, including an inner pipe, the outer wall of the inner pipe is evenly covered with an anti-corrosion layer, and an outer pipe is provided on the outer wall of the inner pipe, and the anti-corrosion layer on the outer pipe and the inner pipe The polyurethane insulation layer is filled in between, and the outer pipe is covered with a heat insulation layer. The molding device of the polyurethane insulation composite pipe includes a foaming extrusion head, and the middle of the foaming extrusion head is provided with an inner pipe. Round holes with matching diameters, and an outer tube extruder head is set on the outer rotating sleeve of the foam extruder head, and a spray box is arranged on the tail end side of the foam extruder head. The present invention can realize the wrapping and covering of the outer pipe and the filling of the polyurethane insulation layer while the inner pipe passes through the matching structure of the foam extrusion head and the outer pipe extrusion head, so that the inner pipe, the polyurethane insulation layer and the The outer tube is formed synchronously in a certain area, which is more efficient and makes the integrity of the tube higher after forming.

Description

technical field [0001] The invention relates to the technical field of polyurethane thermal insulation materials, in particular to a molding device for polyurethane thermal insulation composite pipes. 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 transportati...

AI Technical Summary

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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