A pull-type spring block demolding structure

Abstract

This utility model discloses a pull-type spring block demolding structure, including a front mold with a mounting groove; a rear mold located above the front mold, which cooperates with the front mold to complete the mold opening and closing actions; a spring block assembly having an elastic element and a spring block; the spring block is disposed in the mounting groove, and the side of the spring block facing the rear mold has a forming part for injection molding the product; the spring block has a vertically arranged first groove, and the elastic element is installed in the first groove; a pull assembly is disposed on the rear mold and is interference-fitted with the spring block to drive the spring block upward during mold opening; a limiting assembly is disposed on the front mold, located above the spring block and its bottom abuts against the elastic element to separate the spring block from the pull assembly. During mold opening, the pull assembly drives the spring block to rise synchronously, and the forming part of the spring block drives the product upward, so that the product separates from the front mold first, ensuring that the product is reliably retained in the rear mold and avoiding demolding failure caused by the product being retained in the front mold.

Description

Technical Field

[0001] This utility model relates to the technical field of molds, and in particular to a pull-type spring block demolding structure. Background Technology

[0002] In secondary injection molding processes, for products with raised structures (which are hard plastic parts), traditional mold designs typically place the hard plastic part in the front mold and require slider structures on both sides of the front mold for sealing. During mold opening, the product is held in the rear mold, allowing the raised structure to separate from the front mold. Ejector pins are then placed in the rear mold to eject the product. However, existing technology has a drawback: after the soft plastic is injected, the sliders are in close contact with the product surface. When the mold opens, the sliders must wait for the mold to separate to a certain distance before detaching from the product. This delayed separation mechanism causes the rear mold to separate from the product first, resulting in the product remaining in the front mold and causing demolding failure. Utility Model Content

[0003] In order to overcome the above-mentioned technical defects, this utility model provides a pull-type spring block demolding structure, which aims to solve the problems in the background art.

[0004] This utility model is implemented according to the following technical solution:

[0005] This utility model discloses a pull-type spring block demolding structure, including:

[0006] The front mold has mounting slots;

[0007] The rear mold is located above the front mold and works in conjunction with the front mold to complete the mold opening and closing actions.

[0008] A spring block assembly has an elastic element and a spring block; the spring block is disposed at the mounting groove, the side of the spring block facing the rear mold has a molding part for injection molding products, the spring block has a vertically arranged first groove, and the elastic element is installed in the first groove;

[0009] A pull assembly is disposed on the rear mold and is interference-fitted with the spring block to drive the spring block upward when the mold is opened;

[0010] A limiting component is mounted on the front mold, the limiting component being located above the spring block and its bottom abutting against the elastic element to separate the spring block from the pulling component.

[0011] Compared with the prior art, this utility model uses the interference fit between the spring block assembly and the pulling assembly. When the mold is opened, the pulling assembly drives the spring block to rise synchronously, and the forming part of the spring block drives the product to rise. This allows the product to separate from the front mold first, breaking the problem of disordered separation sequence caused by the delayed separation of the traditional slider. This ensures that the product is reliably retained in the rear mold and avoids demolding failure caused by the product being retained in the front mold.

[0012] In a preferred embodiment, the elastic element is a compression spring.

[0013] In a preferred embodiment, the limiting component is a limiting plate, and when the spring block abuts against the limiting plate, the spring block is at its highest height.

[0014] In a preferred embodiment, there are four first grooves, which are symmetrically arranged on opposite sides of the elastic block; there are four elastic elements, which are respectively arranged at the first grooves; there are two limiting plates, one of which covers two of the first grooves.

[0015] In a preferred embodiment, a second groove is vertically provided on the side of the spring block facing the rear mold;

[0016] The pulling assembly includes a pull pin and an elastic member; the pull pin extends from the rear mold to the front mold and is directly opposite the second groove; the elastic member is disposed on the outer periphery of the pull pin; the elastic member uses its own elasticity to make an interference fit with the second groove.

[0017] In a preferred embodiment, the elastomeric component is a nylon rubber stopper.

[0018] In a preferred embodiment, there are two second grooves, and the two second grooves are symmetrically distributed on both sides of the spring block, corresponding to two pull pin structures. Attached Figure Description

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is a cross-sectional view of the pull-type spring block demolding structure of this utility model;

[0021] Figure 2 This is a perspective view of the front mold of this utility model;

[0022] Figure 3 This is a perspective view of the engagement of the spring block assembly and the limiting assembly of this utility model;

[0023] Figure 4 This is a perspective view of the rear mold of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100-Front mold, 200-Rear mold, 300-Elastic block assembly, 310-Elastic component, 320-Elastic block, 321-First groove, 322-Second groove, 323-Molding part, 400-Pull assembly, 420-Elastomer, 500-Limiting assembly, 510-Limiting plate. Detailed Implementation

[0026] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0027] To better illustrate this utility model, a further detailed description of this utility model is provided below with reference to the accompanying drawings.

[0028] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0029] See Figures 1 to 4 This utility model discloses an injection mold having a front mold 100 spring block assembly 300, comprising:

[0030] The front mold 100 has a mounting groove (not shown);

[0031] The rear mold 200 is located above the front mold 100 and works in conjunction with the front mold 100 to complete the mold opening and closing actions.

[0032] The spring block assembly 300 has an elastic element 310 and a spring block 320; the spring block 320 is disposed in the mounting groove, and the side of the spring block 320 facing the rear mold 200 has a molding part 323 for injection molding products. The spring block 320 has a vertically arranged first groove 321, and the elastic element 310 is installed in the first groove 321.

[0033] A pulling component 400 is disposed on the rear mold 200 and is interference-fitted with the spring block 320 to drive the spring block 320 upward when the mold is opened;

[0034] A limiting component 500 is mounted on the front mold 100. The limiting component 500 is located above the spring block 320 and its bottom abuts against the elastic member 310 to separate the spring block 320 from the pulling component 400.

[0035] Compared with the prior art, this utility model uses the interference fit between the spring block assembly 300 and the pulling assembly 400. When the mold is opened, the pulling assembly 400 drives the spring block 320 to rise synchronously. The forming part 323 of the spring block 320 drives the product to rise, so that the product separates from the front mold 100 first. This breaks the problem of disordered separation sequence caused by the delayed separation of the traditional slider, ensures that the product is reliably retained in the rear mold 200, and avoids demolding failure caused by the product being retained in the front mold 100.

[0036] During mold opening, the pull assembly 400 at the rear mold 200 drives the spring block 320 to rise synchronously through an interference fit. Since the molding part 323 of the spring block 320 is in contact with the bottom surface of the product, the spring block 320 rises while driving the product to rise, causing the product to separate from the front mold 100 first. During the rising process of the spring block 320, the elastic element 310 is compressed and stores elastic potential energy. When the spring block 320 contacts the limiting assembly 500, the limiting assembly 500 prevents the spring block 320 from rising further. The spring block 320 and the pull assembly 400 tend to separate due to the displacement difference, the interference fit is released, and the two begin to separate. After the spring block 320 and the pull assembly 400 are completely separated, the elastic element 310 opens and releases elastic potential energy, pushing the spring block 320 to move downward and reset. After the spring block 320 resets, the molding part 323 of the spring block 320 is realigned with the product molding position of the front mold 100, and the next injection cycle begins.

[0037] In this embodiment, the elastic element 310 is a compression spring. Using a compression spring as the elastic element 310 results in a fast response speed and a simple and practical structure. The compression spring is compressed during the upward movement of the spring block 320, storing elastic potential energy; when the spring block 320 separates from the pulling assembly 400, the compression spring releases energy to drive the spring block 320 to quickly return to its original position.

[0038] In this embodiment, the limiting component 500 is a limiting plate 510. When the spring block 320 abuts against the limiting plate 510, the spring block 320 is at its highest height. The limiting plate 510 acts as a rigid stop, preventing the spring block 320 from continuing to move with the pulling component 400 after rising to its limit position, thus forcing a displacement difference between the two and achieving reliable separation.

[0039] Furthermore, there are four first grooves 321, symmetrically arranged on opposite sides of the spring block 320; there are correspondingly four elastic elements 310, each disposed at one of the first grooves 321; there are two limiting plates 510, with one limiting plate 510 covering two of the first grooves 321. The spring block 320 has four symmetrically arranged grooves on both sides, and each first groove 321 is equipped with an elastic element 310 (such as a compression spring), forming a balanced distribution of elastic force. This avoids uneven elastic force on one side causing the spring block 320 to tilt or jam, ensuring the spring block 320 moves vertically and smoothly.

[0040] In this embodiment, the spring block 320 has a vertically arranged second groove 322 on the side facing the rear mold 200; the pulling assembly 400 includes a pull pin (not shown) and an elastic member 420; the pull pin extends from the rear mold 200 toward the front mold 100 and is directly opposite the second groove 322; the elastic member 420 is disposed on the outer periphery of the pull pin; the elastic member 420 uses its own elasticity to make an interference fit with the second groove 322. The elastic member 420 (such as elastic rubber or silicone) forms a covering layer on the outer periphery of the pull pin, effectively protecting the pull pin; the material elasticity of the elastic member 420 makes it fit tightly against the inner wall of the second groove 322 of the spring block 320, generating friction. This tight fit ensures that the pulling force of the pull pin is reliably transmitted to the spring block 320 when the mold is opened, causing the spring block 320 to rise synchronously.

[0041] Furthermore, the elastomeric part 420 is a nylon plug. The nylon plug can undergo slight elastic deformation to ensure an interference fit with the spring block 320, and the nylon material is resistant to high pressure and high temperature, and can withstand the high temperature environment of injection molding.

[0042] Furthermore, there are two second grooves 322, symmetrically distributed on both sides of the spring block 320, corresponding to two pull pin structures. The two pull pins are symmetrically distributed on both sides of the spring block 320. Through the interference fit between the elastomeric part 420 and the second grooves 322, bidirectional synchronous tension transmission is achieved, avoiding tilting or jamming of the spring block 320 caused by unilateral tension. The two pull pins share the tension of the spring block 320, halving the force on a single pull pin and reducing the risk of deformation or breakage.

[0043] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A pull-type bullet ejection structure characterized by, include: The front mold has mounting slots; The rear mold is located above the front mold and works in conjunction with the front mold to complete the mold opening and closing actions. A spring block assembly has an elastic element and a spring block; the spring block is disposed at the mounting groove, the side of the spring block facing the rear mold has a molding part for injection molding products, the spring block has a vertically arranged first groove, and the elastic element is installed in the first groove; A pull assembly is disposed on the rear mold and is interference-fitted with the spring block to drive the spring block upward when the mold is opened; A limiting component is mounted on the front mold, the limiting component being located above the spring block and its bottom abutting against the elastic element to separate the spring block from the pulling component.

2. The pull-type spring block demolding structure according to claim 1, characterized in that: The elastic element is a compression spring.

3. The pull-type spring block demolding structure according to claim 1, characterized in that: The limiting component is a limiting plate. When the spring block abuts against the limiting plate, the spring block is at its highest height.

4. The pull-type spring block demolding structure according to claim 3, characterized in that: The first groove has four grooves, which are symmetrically arranged on opposite sides of the spring block; There are four elastic elements, each disposed in the first groove; The limiting plate has two parts, and one of the limiting plates covers two of the first grooves.

5. The pull-type spring block demolding structure according to claim 1, characterized in that: The side of the spring block facing the rear mold has a vertically provided second groove; The pulling assembly includes a pull pin and an elastic member; the pull pin extends from the rear mold to the front mold and is directly opposite the second groove; the elastic member is disposed on the outer periphery of the pull pin; the elastic member uses its own elasticity to make an interference fit with the second groove.

6. The pull-type spring block demolding structure according to claim 5, characterized in that: The elastic-molded part is a nylon rubber stopper.

7. The pull-type spring block demolding structure according to claim 5, characterized in that: There are two second grooves, and the two second grooves are symmetrically distributed on both sides of the spring block. There are two corresponding pull pin structures.

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