Injection mold hot runner pouring wire drawing prevention structure

Abstract

According to the technical scheme, the injection mold hot runner pouring wire drawing prevention structure comprises a cavity plate, a core plate and a hot runner nozzle, the front end of the hot runner nozzle is in contact with a product cavity after the hot runner nozzle penetrates through the interior of the cavity plate, a cooling insert is arranged in the cavity plate, and the cooling insert is connected with the core plate. The top face of the cooling insert is concave downwards and then matched with the bottom face of the hot runner nozzle in shape, a cooling channel allowing cooling liquid to circularly flow is formed in the cooling insert, and a cooling water separation piece is arranged in the area, located under the hot runner nozzle, in the core plate. The top of the cooling water separation piece makes contact with the product cavity, cooling liquid flowing circularly is arranged in the cooling water separation piece, and a cooling channel communicated with the interior of the cooling water separation piece is arranged in the core plate. On the basis that a hot runner structure is adopted, the defect that a product close to the position of the nozzle is not easy to cure so as to generate wiredrawing in the mold opening process can be avoided, and the injection molding efficiency can be ensured.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to a hot runner pouring prevention structure for injection molds. Background Art

[0002] For many plastic products produced by injection molds, there are usually two structures in the structure of the injection mold: cold runner and hot runner. The nozzle of the hot runner structure directly contacts the surface of the product, which will simplify the internal structure of the mold, but it is necessary to ensure the molten state of the internal raw materials. Therefore, the temperature of the nozzle head is very high. The problem is that during the injection molding process, after other parts of the product have been solidified, the part adjacent to the nozzle head is still softened. At this time, wire drawing will occur at this place when the mold is opened, resulting in unqualified products after mold opening.

[0003] However, although the use of a cold runner structure can avoid the above problems, it will bring new problems. For example, a large amount of runner waste will be generated after each injection molding, and a mechanism to eject the waste needs to be set up, which leads to the complexity of the mold structure and increases production costs. Utility Model Content

[0004] In view of the above problems, the utility model aims to provide an injection mold hot runner pouring anti-wiredrawing structure, which can avoid the defect of wiredrawing in the mold opening process caused by the product near the nozzle position being difficult to solidify based on the hot runner structure.

[0005] The technical solution of the utility model is a hot runner pouring prevention structure for an injection mold, comprising a cavity plate, a core plate and a hot runner nozzle, wherein the front end of the hot runner nozzle contacts the product cavity after passing through the interior of the cavity plate, a cooling insert is arranged inside the cavity plate, the top surface of the cooling insert is concave and matches the shape of the bottom surface of the hot runner nozzle, a cooling channel for circulating cooling liquid is arranged inside the cooling insert, a cooling water baffle is arranged in the area directly below the hot runner nozzle inside the core plate, the top of the cooling water baffle contacts the product cavity and circulating cooling liquid is arranged inside the core plate, and a cooling channel connected to the interior of the cooling water baffle is arranged inside the core plate.

[0006] Preferably, the coolant is cooling water or cooling oil.

[0007] The utility model can avoid the defect of wire drawing in the mold opening process due to the difficulty in solidification of the product near the nozzle position on the basis of adopting the hot runner structure, and can ensure the injection molding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the utility model;

[0009] Among them: 1—hot runner nozzle; 2—cooling insert; 3—cooling channel; 4—cooling water baffle. DETAILED DESCRIPTION

[0010] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0011] like Figure 1 As shown, the utility model discloses a hot runner pouring prevention structure for an injection mold, comprising a cavity plate, a core plate and a hot runner nozzle 1, wherein the front end of the hot runner nozzle 1 contacts a product cavity after passing through the cavity plate, a cooling insert 2 is arranged inside the cavity plate, and the top surface of the cooling insert 2 is concave and matched with the bottom shape of the hot runner nozzle 1, a cooling channel 3 for circulating cooling liquid is arranged inside the cooling insert 2, a cooling water baffle 4 is arranged in the area directly below the hot runner nozzle 1 inside the core plate, the top of the cooling water baffle 4 contacts the product cavity and circulating cooling liquid is arranged inside, and a cooling channel connected to the inside of the cooling water baffle 4 is arranged inside the core plate.

[0012] In the above solution, the coolant is cooling water or cooling oil.

[0013] Since the structure of the utility model is applicable to many different injection molding products, in view of the diversity of products and the different structures of the specific cavity plate and the core plate, Figure 1 The cavity plate, core plate and specific structure of specific products are omitted.

[0014] The principle of the utility model is to address the phenomenon that the product in contact with the hot runner nozzle 1 is not easy to solidify due to the high temperature thereat, and a cooling insert 2 and a cooling water baffle 4 are specially arranged to cool down the local area in a coordinated manner, so that the product at this position can be normally solidified, avoiding mold drawing and improving injection molding efficiency.

[0015] The above description is only a preferred implementation mode of the utility model, and does not impose any form of limitation on the utility model. Any simple modification, equivalent change or modification made to the above embodiments based on the technical principle of the utility model still falls within the scope of the technical solution of the utility model.

Claims

1. A hot runner pouring prevention structure for an injection mold, comprising a cavity plate, a core plate and a hot runner nozzle (1), characterized in that: After the hot runner nozzle (1) passes through the cavity plate, its front end contacts the product cavity; a cooling insert (2) is arranged inside the cavity plate; the top surface of the cooling insert (2) is concave and matches the shape of the bottom surface of the hot runner nozzle (1); a cooling channel (3) for circulating cooling liquid is arranged inside the cooling insert (2); a cooling water baffle (4) is arranged in the area directly below the hot runner nozzle (1) inside the core plate; the top of the cooling water baffle (4) contacts the product cavity and is provided with circulating cooling liquid inside; a cooling channel connected to the inside of the cooling water baffle (4) is arranged inside the core plate.

2. The anti-wire drawing structure for hot runner inlet of an injection mold according to claim 1, characterized in that: The coolant is cooling water or cooling oil.

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