A polyurethane foam filled ring foaming mold

Abstract

The invention provides a polyurethane foam filled ring foaming mold, comprising: a female mold, including a left female mold and a right female mold, the left female mold and the right female mold are combined to form a mold cavity inside, and the left female mold and the right female mold are detachable connection; the male mold, including the upper male mold and the lower male mold, the upper male mold and the lower male mold are combined to form a mold cavity with the cavity of the female mold, and the mold cavity is suitable for polyurethane foam filling ring molding; the injection structure is designed On the female mold, it is suitable for injecting polyurethane foam into the mold cavity. The polyurethane foam filled ring foaming mould, male and female molds can be removed smoothly, and can avoid direct action on the product during demoulding, avoiding prying, knocking and other operations that cause damage to the product. Rapid plugging, smooth product shape, no redundant structure.

Description

technical field [0001] The invention belongs to the technical field of molds for polyurethane products, and in particular relates to a polyurethane foam-filled ring foaming mold. Background technique [0002] Rigid polyurethane foam has excellent thermal insulation properties. As a new type of thermal insulation material, its application in building exterior wall insulation systems, cold storage and refrigerated vehicle insulation systems will promote the development of energy-saving engineering technology. The polyurethane foam filled ring is a ring-shaped sealing material, usually a ring-shaped structure with a small inner diameter in the middle and larger inner diameters at both ends. [0003] At present, polyurethane foam usually adopts pouring foaming and spraying foaming. The polyurethane foaming process has high requirements on the structural design of the forming mold, but the following problems still exist in the design of the existing molds: because the mold stick...

AI Technical Summary

Problems solved by technology

The polyurethane foaming process has high requirements on the structural design of the forming mold, but the following problems still exist in the design of the existing molds: because the mold sticking force is relatively large after the polyurethane foaming, the structural design of the mold (that is, the mold Type) is very important to whether the product can be demolded smoothly and intact. Chinese patent document CN201800184U discloses a mold suitable for the production of radiation crosslinked polypropylene, including a female mold, a male mold, and a cover plate. The mold cavity formed by the mold molds the foaming material, but the female mold and the male mold of the mold are integral molds, and there is no point of force when the product is removed from the female mold and the male mold, and it is not easy to demould. The existing mold structure is also designed as The female mold is an integral mould, and the male mold is split in half from top to bottom. In this design, because the male mold is split in half from top to bottom, when the male mold is demoulded, the product may stay on the upper male mold or the lower male mold. Therefore, it is necessary to The demoulding design is considered on both the upper and lower male molds, which increases the difficulty of the mold structure and the risk of damage to the product during demoulding; the injection port of the existing foam mold is designed to cooperate with internal and external threads. The foam produced by polyurethane foaming during foaming is easy to block the thread, which makes it difficult for the mold to be reused and cleaned. On the other hand, the thread connection operation takes a long time. If it is blocked early during pouring and foaming, it is not conducive to the gas discharge during foaming , if the foam material rises to a certain extent before blocking, the polyurethane foam may overflow and solidify at the pouring port, forming a product body, resulting in a lot of post-processing work; The requirement for dimensional accuracy is high, while the existing mold design only considers the parting of male and female molds, without other demoulding mechanism. The demoulding method that directly acts on the surface of the product is adopted, which causes great surface damage when the product is demolded. On the other hand, when the product is pried off, the cavity surface of the mold is also damaged.

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