Multi-component polyurethane mixed injection gun head for refrigerator

Abstract

The invention discloses a multi-component polyurethane mixed injection gun head for a refrigerator, and relates to the technical field of foaming injection equipment. The gun head comprises a gun headbody, a material injection hole A and a material injection hole B which are communicated with the mixing chamber are respectively formed in two side surfaces of the gun head body; the outer ports ofthe material injection hole A and the material injection hole B are connected with material injection piston mechanisms; stepped through holes communicated with the mixing chamber are formed in opposite side surfaces of the gun head body; mixing pipe heads are in interference fit with the interiors of the two stepped through holes; and the outer ports of the two stepped through holes are connectedwith auxiliary injection mechanisms. The gun head body is connected with the two material injection piston mechanisms and the two auxiliary agent injection mechanisms, so that a foaming auxiliary agent can be independently injected into the gun head body, and the problem that the foaming quality is influenced due to uneven premixing caused by the fact that an existing foaming auxiliary agent cannot be independently injected is solved; and the mixing pipe head is arranged, so that the foaming aid is fully mixed, the mixing effect is further improved, and the foaming quality is improved.

Description

technical field [0001] The invention belongs to the technical field of foam injection equipment, in particular to a multi-component polyurethane mixed injection gun head for refrigerators. Background technique [0002] Refrigerators and freezers are indispensable electrical appliances in the family. The very important process in the production of refrigerators and freezers is polyurethane foaming. Both the cabinet and the door of the refrigerator need to be foamed with polyurethane foam to form a foam insulation layer, so as to achieve heat preservation and support. effect. Therefore, the foaming quality of the refrigerator is extremely important. At the same time, the foaming technology of the refrigerator is constantly developing. ether (hereinafter referred to as "pure white material") to form a mixed material (hereinafter referred to as "mixed white material"), and then inject the mixed white material and isocyanate PM-200 (hereinafter referred to as "black material") t...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a multi-component polyurethane mixed injection gun head for refrigerators. By connecting two injection piston mechanisms and two auxiliary agent injection mechanisms on the gun head body, the foaming auxiliary agent can be injected into the gun head body separately. It solves the problem that the existing foaming aids cannot be injected separately, resulting in uneven premixing and affecting the foaming quality; at the same time, by setting the mixing tube head, the foaming aids can be fully mixed, which further improves the mixing efficiency. effect, which is conducive to improving the foaming quality

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