A two-section slider spring pin ejection structure for injection molds

Abstract

This utility model relates to a double-section slider-pin ejector structure for injection molds, belonging to the field of injection mold technology. It includes a slider base with a slider on it. An integral slider groove is provided between the slider and the slider base. A spring-pin ejector assembly, fitted to the slider base, is located within the slider. The spring-pin ejector assembly includes a spring pin, with a spring engaging between the front end of the spring pin and the slider. It features a compact structure, good operational stability, and smooth ejection. By integrating the spring pin inside the slider, the spring force allows for a secondary ejection of the product after the slider completes its main core-pulling action, ensuring the product completely detaches from the mold components and preventing damage or deformation.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a double-section slider spring pin demolding structure for injection molds. Background Technology

[0002] In the field of injection molding, "undercut" refers to a structure on a product that prevents it from being directly ejected along the mold opening direction. Common examples include: internal undercuts (such as snap-fits, threads, and grooves); deep ribs and pillars (especially tall and thin screw pillars and positioning pillars); and multi-directional composite undercuts (both lateral and vertical).

[0003] If the product is forcibly demolded directly, it is very easy to cause: product tearing, deformation, or breakage; mold damage; low yield and appearance defects.

[0004] To solve the problem of undercutting, traditional molds often use the following structure: Slider (sliding) structure: It uses inclined guide posts, hydraulic cylinders, etc. to drive and achieve lateral core pulling, but it can only solve the problem of backing in one direction.

[0005] Angled top structure: suitable for inward undercut, but when demolding deep ribs or pillars, the phenomenon of "sticking to the angled top" is prone to occur, that is, the product sticks to the angled top and cannot be easily removed.

[0006] Forced demolding (forced demolding): Only applicable to materials with small undercuts and good elasticity. Not applicable to products with complex structures or high precision requirements.

[0007] Core limitation: Traditional structures are difficult to handle combinations of "deep pillars + inner undercuts" or "multi-directional undercuts", often requiring multiple mechanisms to be combined, resulting in complex mold structures, high costs, and unreliable operation. Summary of the Invention

[0008] This invention addresses the shortcomings of existing technologies by providing a double-section slider-pin ejection structure for injection molds. This structure is characterized by its compact design, good operational stability, and smooth demolding. The spring pin is integrated inside the slider. Utilizing the spring force, after the slider completes its main core-pulling action, the spring pin performs a secondary ejection of the product, ensuring complete separation from the mold components and preventing damage or deformation.

[0009] The above-mentioned technical problems of this utility model are mainly solved by the following technical solutions: A double-section slider-pin ejector structure for an injection mold includes a slider base, a slider on the slider base, a slider groove integrally formed with the slider base between the slider and the slider base, and a pin ejector assembly fitted to the slider base within the slider. The pin ejector assembly includes a pin, and a spring is fitted between the front end of the pin and the slider.

[0010] Preferably, a fixing block is provided between the rear end of the spring pin and the slider seat, which is connected and fixed to the slider with screws.

[0011] Preferably, the upper end of the spring pin is provided with a limiting rod extending out of the upper end surface of the slider.

[0012] This invention can achieve the following effects: This invention provides a double-section slider-pin ejection structure for injection molds, which, compared with existing technologies, features a compact structure, good operational stability, and smooth demolding. The spring pin is integrated inside the slider. Utilizing the spring force, after the slider completes the main core-pulling action, the spring pin performs a secondary ejection of the product, ensuring the product completely detaches from the mold components and preventing damage or deformation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a structural cross-sectional view of the present invention.

[0015] Figure 3 This is a schematic diagram of the spring pin release assembly in this utility model.

[0016] In the diagram: slider 1, slider groove 2, slider seat 3, spring pin demolding assembly 4, spring 5, limit rod 6, fixing block 7, spring pin 8. Detailed Implementation

[0017] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0018] Example: Figure 1 , Figure 2 and Figure 3 As shown, a double-section slider-pin ejector structure for an injection mold includes a slider base 3, a slider 1 mounted on the slider base 3, a slider groove 2 integrally formed with the slider base 3 between the slider 1 and the slider base 3, and a spring-pin ejector assembly 4 fitted into the slider base 3 within the slider 1. The spring-pin ejector assembly 4 includes a spring pin 8, with a spring 5 sleeved between the front end of the spring pin 8 and the slider 1. A fixing block 7, screwed and fixed to the slider 1, is provided between the rear end of the spring pin 8 and the slider base 3. A limiting rod 6 extending from the upper end face of the slider 1 is provided at the upper end of the spring pin 8.

[0019] Working principle: When the mold opens, the slider 1 moves backward. Due to the contact of the limiting rod 6, the spring pin 8 is restricted from retracting, thus completing the action of the spring pin 8 ejecting the column product. After the mold opens by 5mm, the limiting rod 6 completely disengages from the spring pin 8. The slider 1 is equipped with a spring 5, and the spring pin 8 returns to its original position under the action of the spring 5. The slider 1 then drives the spring pin 8 to completely disengage from the column product.

[0020] The meaning of "Double Festival" is reflected in: First "section": Limit rod 6 is activated, spring pin 8 extends relative to slider 1, and pushes out.

[0021] The second "section": When the limit rod 6 fails, the spring 5 resets the spring pin 8, and then the spring pin 8 and the slider 1 work together as a whole to complete the core pulling. These two continuous and different action stages constitute the core concept of "double section".

[0022] In summary, the double-section slider-pin ejection structure of this injection mold features a compact structure, good operational stability, and smooth demolding. By integrating the spring pin inside the slider, and utilizing the spring force, the spring pin performs a secondary ejection of the product after the slider completes the main core-pulling action, ensuring the product completely detaches from the mold components and preventing damage or deformation.

[0023] It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0024] In summary, the above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A double-section slider spring pin demolding structure for an injection mold, characterized in that: Includes a slider seat (3), on which a slider (1) is provided, and between the slider (1) and the slider seat (3) there is a slider groove (2) integral with the slider seat (3), and the slider (1) is provided with a spring pin demolding assembly (4) that fits with the slider seat (3); the spring pin demolding assembly (4) includes a spring pin (8), and between the front end of the spring pin (8) and the slider (1) there is a spring (5) that is sleeved with the spring pin (8).

2. The double-section slider spring pin demolding structure for an injection mold according to claim 1, characterized in that: The rear end of the spring needle (8) and the slider seat (3) are provided with a fixing block (7) that is screwed and fixed to the slider (1).

3. The double-section slider spring pin demolding structure for an injection mold according to claim 1, characterized in that: The upper end of the spring needle (8) is provided with a limiting rod (6) extending out of the upper end face of the slider (1).

Images