Large helical tooth core-pulling structure for injection mold

Abstract

The utility model discloses a big helical tooth core-pulling structure for an injection mold, the injection mold comprises a movable mold and a fixed mold, a product cavity is arranged at the joint of the fixed mold and the movable mold, the big helical tooth core-pulling structure comprises a core-pulling slide block and a core-pulling driving assembly, the core-pulling driving assembly is connected with the movable mold, the core-pulling slide block is in sliding connection with the fixed mold, and the product cavity is arranged in the product cavity. A core-pulling insert is arranged on the core-pulling sliding block, first helical teeth are arranged on the core-pulling driving assembly, second helical teeth are arranged on the core-pulling sliding block, the first helical teeth and the second helical teeth are clamped in a sliding manner, and the movable mold can drive the core-pulling driving assembly to move so as to drive the core-pulling sliding block and the core-pulling insert to move together. And the core-pulling insert extends into or out of the product cavity. Core pulling of a plastic part is completed through mold opening force of an injection molding machine, the size of the mold is reduced, the mold can be suitable for a small injection molding machine, the production cost is reduced, the injection molding period can be shortened, and the machining efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a large helical tooth core-pulling structure for injection molds. Background Technology

[0002] Currently, plastic products are widely used in various fields. Plastic products can replace many metal products, reducing costs and product weight. Moreover, the structure and performance of some plastic products cannot be replaced by metals.

[0003] When designing and producing plastic molds for hollow products, inserts are required because the interior of the plastic part is hollow. During injection molding, the insert extends into the product cavity; after injection molding is completed, the insert is removed from the product to complete demolding. This process of removing the insert is usually called core pulling.

[0004] In injection molds, most common core-pulling mechanisms currently use hydraulic cylinders. The cylinders drive a slider, which in turn pulls the insert out of the product to complete the core-pulling process. This design requires installing hydraulic cylinders on the mold and signal switches to control their sequence of action, extending the injection cycle and hindering efficient production. Furthermore, installing hydraulic cylinders and control switches increases the overall size of the mold, requiring larger injection molding machines and increasing production costs. Utility Model Content

[0005] To address some or all of the problems existing in the prior art, this utility model provides a large oblique tooth core-pulling structure for injection molds. The injection mold includes a moving mold and a fixed mold, which are closable. A product cavity is provided at the connection position between the fixed mold and the moving mold. The large oblique tooth core-pulling structure includes a core-pulling slider and a core-pulling drive assembly. The core-pulling drive assembly is connected to the moving mold, and the core-pulling slider is slidably connected to the fixed mold. A core-pulling insert is provided on the core-pulling slider. A first oblique tooth is provided on the core-pulling drive assembly, and a second oblique tooth is provided on the core-pulling slider. The first oblique tooth and the second oblique tooth are slidably engaged. The moving mold can drive the core-pulling drive assembly to move, thereby driving the core-pulling slider and the core-pulling insert to move together, so that the core-pulling insert extends into or extends out of the product cavity.

[0006] As a further improvement of this utility model, the fixed mold is provided with a core-pulling guide block, and the core-pulling slider is slidably engaged with the core-pulling guide block.

[0007] As a further improvement of this utility model, there are two core-pulling guide blocks, and the two core-pulling guide blocks are symmetrically distributed on the left and right sides of the core-pulling slider.

[0008] As a further improvement of this utility model, the core-pulling drive assembly includes a limiting block and a linkage component. One end of the limiting block is connected to the moving mold, and the other end is connected to the linkage component. The first helical tooth is disposed on the linkage component.

[0009] As a further improvement of this utility model, the end of the limiting block near the linkage member is provided with an abutting inclined surface, and the core-pulling slider is provided with a limiting inclined surface adapted to the abutting inclined surface, and the abutting inclined surface can abut against the limiting inclined surface.

[0010] As a further improvement of this utility model, a first wear-resistant block is provided on the limiting inclined surface.

[0011] As a further improvement of this utility model, there are two linkage components, which are respectively connected to the limiting block and are symmetrically distributed on the left and right sides of the core-pulling slider.

[0012] As a further improvement of this utility model, the fixed mold is provided with a second wear-resistant block, and the core-pulling slider is slidably connected to the second wear-resistant block.

[0013] As a further improvement of this utility model, the second wear-resistant block is provided with a limiting elastic block, the limiting elastic block extends out of the upper end face of the second wear-resistant block, and the core-pulling slider is provided with a limiting groove on the mating surface of the second wear-resistant block, the limiting elastic block can be engaged with the limiting groove.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention employs a helical gear meshing structure, thereby enabling the core pulling of the plastic part to be completed using the mold opening force of the injection molding machine, eliminating the need for a separate hydraulic cylinder. This reduces the size of the mold, making it suitable for use with smaller injection molding machines and lowering production costs. The automatic core pulling feature also shortens the injection molding cycle, thereby improving processing efficiency and meeting the demands of high-efficiency processing. In practice, the fixed mold and the moving mold are installed on the injection molding machine. During injection, the core-pulling insert extends into the product cavity. After injection, the injection molding machine drives the moving mold to move away from the fixed mold. The moving mold pulls the core-pulling drive assembly to move together. With the cooperation of the first and second helical teeth, the core-pulling drive assembly can drive the core-pulling slider to slide on the fixed mold, causing the core-pulling insert to move together, so that the core-pulling insert extends out of the product cavity, completing the core-pulling process. When the mold is closed, the moving mold moves towards the fixed mold. The moving mold pushes the core-pulling drive assembly to move. With the cooperation of the first and second helical teeth, the core-pulling drive assembly can drive the core-pulling slider to slide in the opposite direction on the fixed mold, causing the core-pulling insert to move together, so that the core-pulling insert re-extends into the product cavity until the mold is closed. Attached Figure Description

[0016] To more clearly illustrate the solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this utility model;

[0018] Figure 2 This is a schematic diagram of the core-pulling drive assembly in an embodiment of this utility model;

[0019] Figure 3 This is a schematic diagram of the core-pulling slider in an embodiment of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the injection mold in the embodiment of this utility model. Detailed Implementation

[0021] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0022] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0024] like Figure 1-4As shown, a large helical tooth core-pulling structure for injection molds is disclosed. The injection mold includes a moving mold 100 and a fixed mold 200, which are closable. A product cavity 300 for molding products is provided at the connection position between the fixed mold 200 and the moving mold 100. The injection mold for the large helical tooth core-pulling structure includes a core-pulling slider 1 and a core-pulling drive assembly 2. The core-pulling drive assembly 2 is mounted on the moving mold 100, and the core-pulling slider 1 is mounted on the fixed mold 200 and slidably connected to the fixed mold 200. A core-pulling insert 3 is mounted on the core-pulling slider 1, and the core-pulling insert 3 can extend into the product cavity 300. The core-pulling drive assembly 2 is provided with a first helical tooth 21, and the core-pulling slider 1 is provided with a second helical tooth 11. The first helical tooth 21 and the second helical tooth 11 are slidably engaged. Through the cooperation of the first helical tooth 21 and the second helical tooth 11, the core-pulling drive assembly 2 and the core-pulling slider 1 form a linkage mechanism, thereby enabling the core-pulling drive assembly 2 to drive the core-pulling insert 3 to extend into or out of the product cavity 300.

[0025] Before processing, the moving mold 100 and the fixed mold 200 are respectively installed on the injection molding machine. During processing, the injection molding machine drives the moving mold 100 to move closer to or further away from the fixed mold 200, thereby achieving mold closing or opening. When the moving mold 100 and the fixed mold 200 are closed, the core-pulling insert 3 extends into the product cavity 300, and the injection molding machine injects rubber material into the product cavity 300 to form the product; after the product is formed, the injection molding machine drives the mold to open, causing the moving mold 100 to move away from the fixed mold 200. The moving mold 100 drives the core-pulling drive assembly 2 to move. Under the action of the first helical tooth 21, the core-pulling drive assembly 2 drives the second helical tooth 11 to move, which in turn drives the core-pulling slider 1 to slide on the fixed mold 200. The core-pulling slider 1 drives the core-pulling insert 3 to extend out of the product cavity 300, completing the product core pulling. This large helical tooth core-pulling structure uses a helical tooth mating structure to complete the core-pulling process of plastic parts by utilizing the mold opening force of the injection molding machine. It eliminates the need for hydraulic cylinders and control mechanisms, reducing the size of the mold and making it suitable for use with smaller injection molding machines, thus lowering production costs. The automatic core-pulling function also shortens the injection molding cycle, thereby improving processing efficiency and meeting the needs of high-efficiency processing.

[0026] To limit and guide the movement of the core-pulling slider 1, a core-pulling guide block 4 is installed on the fixed mold 200, and the core-pulling slider 1 is slidably engaged with the core-pulling guide block 4. When the injection molding machine drives the moving mold 100 to close or open the mold, the moving mold 100 drives the core-pulling drive assembly 2 to move, thereby driving the core-pulling slider 1 to move together with the first helical tooth 21 and the second helical tooth 11. The core-pulling slider 1 slides on the core-pulling guide block 4, and the movement direction of the core-pulling slider 1 is limited by the core-pulling guide block 4, thereby ensuring that the core-pulling slider 1 can drive the core-pulling insert 3 to extend into or out of the product cavity 300.

[0027] In this embodiment, there are two core-pulling guide blocks 4, which are symmetrically distributed on the left and right sides of the core-pulling slider 1. The two core-pulling guide blocks 4 limit and guide the core-pulling slider 1, thereby improving the transmission accuracy and stability and ensuring the machining precision.

[0028] The core-pulling drive assembly 2 includes a limiting block 5 and a linkage 6. One end of the limiting block 5 is fixedly connected to the moving mold 100 by screws, and the other end is fixedly connected to the linkage 6. A first helical tooth 21 is disposed on the linkage 6. In this embodiment, there are two linkages 6, and each linkage 6 is fixedly connected to the limiting block 5. The two linkages 6 are symmetrically distributed on the left and right sides of the core-pulling slider 1. During operation, the moving mold 100 drives the limiting block 5 to move, which in turn drives the two linkages 6 to move. Through the cooperation of the first helical tooth 21 and the second helical tooth 11, the core-pulling slider 1 moves together, causing the core-pulling insert 3 to extend into or out of the product cavity 300. By setting two linkages 6, the core-pulling slider 1 can be subjected to force on both sides simultaneously, which can improve the stability of the transmission and ensure the accuracy of processing.

[0029] The function of the limiting block 5 is to hold the core-pulling slider 1 after the mold is closed, preventing the core-pulling slider 1 from shifting during injection molding and improving the yield rate. Specifically, the end of the limiting block 5 near the linkage 6 is provided with an abutting inclined surface 51, and the core-pulling slider 1 is provided with a limiting inclined surface 12 that matches the abutting inclined surface 51. When the injection molding machine drives the moving mold 100 to move closer to the fixed mold 200, until the moving mold 100 and the fixed mold 200 are completed, the abutting inclined surface 51 will abut against the limiting inclined surface 12. By abutting the limiting inclined surface 12 with the abutting inclined surface 51, the core-pulling slider 1 is prevented from moving backward during injection molding, thereby improving the yield rate.

[0030] In order to reduce the wear of the core-pulling slider 1, a first wear-resistant block 7 is provided on the limiting inclined surface 12. After the mold is closed, the abutting inclined surface 51 on the limiting block 5 abuts against the first wear-resistant block 7. By setting the first wear-resistant block 7, the wear of the core-pulling slider 1 can be reduced, thereby extending its service life.

[0031] To further reduce wear, a second wear-resistant block 8 is provided on the fixed mold 200 at a position corresponding to the core-pulling slider 1, and the core-pulling slider 1 is slidably connected to the second wear-resistant block 8. During mold opening or closing, the linkage 6 can drive the core-pulling slider 1 to slide on the second wear-resistant block 8 through the cooperation of the first helical tooth 21 and the second helical tooth 11; by setting the second wear-resistant block 8, the wear of the fixed mold 200 can be reduced, thereby extending its service life and ensuring the accuracy of transmission.

[0032] To limit the extension of the core-pulling insert out of the product cavity 300, a limiting elastic block 9 is provided on the second wear-resistant block 8. The limiting elastic block 9 extends out of the upper end face of the second wear-resistant block 8. A limiting groove 13 is provided on the mating surface of the core-pulling slider 1 and the second wear-resistant block 8, and the limiting elastic block 9 can engage with the limiting groove 13. During the mold opening process, the linkage 6 can drive the core-pulling slider 1 to slide on the second wear-resistant block 8 through the engagement of the first helical tooth 21 and the second helical tooth 11, so that the core-pulling insert 3 extends out of the product cavity 300. As the linkage 6 continues to move, when the limiting groove 13 on the core-pulling slider 1 aligns with the limiting elastic block 9, the mold opening is completed, and the injection molding machine stops driving. Under the elastic force of the limiting elastic block 9, it will be engaged in the limiting groove 13, thereby limiting and fixing the core-pulling slider 1 and the second wear-resistant block 8. During mold closing, the linkage 6 drives the core-pulling slider 1 to move via the first helical tooth 21. The driving force of the linkage 6 is much greater than the elasticity of the limiting elastic block 9, so the lower end face of the core-pulling slider 1 will squeeze the limiting elastic block 9, compressing it back into the second wear-resistant block 8 and sliding on the surface of the second wear-resistant block 8. Through the cooperation of the limiting groove 13 and the limiting elastic block 9, the core-pulling slider 1 can be fixedly connected to the fixed mold 200 after completing the core pulling, improving the stability of the structure.

[0033] Working principle:

[0034] When the mold is closed, the injection molding machine drives the moving mold 100 to move closer to the fixed mold 200. The moving mold 100 drives the limiting block 5 and the linkage 6 to move together. The linkage 6, with the cooperation of the first helical tooth 21 and the second helical tooth 11, drives the core-pulling slider 1 to slide on the second wear-resistant block 8, so that the core-pulling insert 3 moves closer to the product cavity 300 until it abuts the inclined surface 51 and abuts the first wear-resistant block 7. At this time, the core-pulling insert 3 also extends into the product cavity 300.

[0035] When the mold is opened, the injection molding machine drives the moving mold 100 to move away from the fixed mold 200. The moving mold 100 drives the limiting block 5 and the linkage 6 to move together. The linkage 6, with the cooperation of the first helical tooth 21 and the second helical tooth 11, drives the core-pulling slider 1 to slide on the second wear-resistant block 8, so that the core-pulling insert 3 moves away from the product cavity 300. Until the limiting groove 13 is aligned with the limiting elastic block 9, the limiting elastic block 9 will automatically be inserted into the limiting groove 13 under the action of elastic force. At this time, the core-pulling insert 3 is also just pulled out of the product cavity 300. The injection molding machine stops driving and the core-pulling of the product is completed.

[0036] The above-described specific embodiments are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with this utility model are within the protection scope of this utility model.

Claims

1. A large helical tooth core-pulling structure for injection molds, the injection mold comprising a moving mold and a fixed mold, wherein the fixed mold and the moving mold are closable, and a product cavity is provided at the connection position between the fixed mold and the moving mold, characterized in that: The large helical tooth core-pulling structure includes a core-pulling slider and a core-pulling drive assembly. The core-pulling drive assembly is connected to the moving mold, and the core-pulling slider is slidably connected to the fixed mold. The core-pulling slider is provided with a core-pulling insert. The core-pulling drive assembly is provided with a first helical tooth, and the core-pulling slider is provided with a second helical tooth. The first helical tooth and the second helical tooth are slidably engaged. The moving mold can drive the core-pulling drive assembly to move, thereby driving the core-pulling slider and the core-pulling insert to move together, so that the core-pulling insert extends into or extends out of the product cavity.

2. The large helical tooth core-pulling structure for injection molds according to claim 1, characterized in that: The fixed mold is provided with a core-pulling guide block, and the core-pulling slider is slidably engaged with the core-pulling guide block.

3. The large helical tooth core-pulling structure for injection molds according to claim 2, characterized in that: There are two core-pulling guide blocks, and the two core-pulling guide blocks are symmetrically distributed on the left and right sides of the core-pulling slider.

4. The large helical tooth core-pulling structure for injection molds according to claim 2, characterized in that: The core-pulling drive assembly includes a limiting block and a linkage component. One end of the limiting block is connected to the moving mold, and the other end is connected to the linkage component. The first helical tooth is disposed on the linkage component.

5. The large helical tooth core-pulling structure for injection molds according to claim 4, characterized in that: The limiting block has an abutting inclined surface at one end near the linkage component, and the core-pulling slider has a limiting inclined surface adapted to the abutting inclined surface, and the abutting inclined surface can abut against the limiting inclined surface.

6. The large helical tooth core-pulling structure for injection molds according to claim 5, characterized in that: The limiting inclined surface is provided with a first wear-resistant block.

7. The large helical tooth core-pulling structure for injection molds according to claim 4, characterized in that: There are two linkage components, each connected to the limiting block, and the two linkage components are symmetrically distributed on the left and right sides of the core-pulling slider.

8. The large helical tooth core-pulling structure for injection molds according to any one of claims 1-7, characterized in that: The fixed mold is provided with a second wear-resistant block, and the core-pulling slider is slidably connected to the second wear-resistant block.

9. The large helical tooth core-pulling structure for injection molds according to claim 8, characterized in that: The second wear-resistant block is provided with a limiting elastic block, which extends out of the upper end face of the second wear-resistant block. The core-pulling slider and the mating surface of the second wear-resistant block are provided with a limiting groove, and the limiting elastic block can be engaged with the limiting groove.

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