A push plate type demolding mechanism and an injection mold

Abstract

The utility model relates to a kind of push plate type stripping mechanism and injection mold, push plate type stripping mechanism includes push plate and core, and push plate is provided with perforation, and core includes the extension part of being perforated in the perforation and the forming part of being perforated out the perforation, the forming part is as the forming end for injection molding, push plate is set to the direction of core and be ejected out the perforation, further include guide bushing, the guide bushing is around the core setting, and the guide bushing is fixedly connected on the inner wall of the perforation, the guide bushing and extension part form sliding fit.The utility model is guided to the ejection stroke of push plate by the sliding connection cooperation of guide bushing and extension part, so that push plate does not incline to the forming end of core and moves, avoid the problem that push plate is bruised forming end.

Description

Technical Field

[0001] This utility model relates to an injection mold, specifically a push-plate type demolding mechanism. Background Technology

[0002] Ejector-type demolding mechanisms are widely used in injection molds. Their structure typically includes a core and an ejector plate. The ejector plate has a perforation through which the core passes, with the end of the core protruding serving as the molding end of the product. During demolding, the ejector plate moves outward, pushing the molded product off the core. However, this ejector-type demolding mechanism has a drawback: the ejector plate easily rubs against the molding part of the core during ejection, causing damage to the ejector plate's opening and the core's molding end, thus affecting product quality. In actual production, to avoid this problem, frequent inspection and replacement of the core and ejector plate are required, resulting in low production efficiency. Utility Model Content

[0003] To address the aforementioned problems, this utility model proposes an optimized push-plate type demolding mechanism and an injection mold having the push-plate type demolding mechanism.

[0004] This utility model is achieved using the following technical solution:

[0005] This utility model proposes a push-plate type demolding mechanism, including a push plate and a core. The push plate is provided with a through hole. The core includes an extension portion passing through the through hole and a forming portion passing through the through hole. The forming portion serves as a forming end for injection molding. The push plate is configured to push out in the direction that the core passes through the through hole. It also includes a guide bushing. The guide bushing is arranged around the core and is fixed against the inner wall of the through hole and forms a conical surface fit with the through hole for fixation. The guide bushing and the extension portion form a sliding fit.

[0006] Preferably, the forming portion is smaller than the extension portion.

[0007] Preferably, the device further includes a stop block, wherein the through hole is a tapered hole that gradually narrows toward the ejection direction of the push plate, and the outer peripheral surface of the guide bushing is a tapered surface that gradually narrows toward the ejection direction of the push plate. The stop block is fixedly connected to the push plate and abuts against the guide bushing in the ejection direction of the push plate, so that the outer peripheral surface of the guide bushing abuts against the inner wall of the through hole to form a tapered surface fit.

[0008] Preferably, the abutment block is detachably screwed to the push plate.

[0009] Preferably, the abutment block is disposed at one end of the perforation away from the forming part.

[0010] Preferably, the perforation is a square hole, and the guide bushing is a square annular structure.

[0011] Preferably, the guide bushing is assembled from multiple trapezoidal block units connected side by side.

[0012] Based on the above-described push-plate demolding mechanism, this embodiment also proposes an injection mold that includes the above-described push-plate demolding mechanism.

[0013] This invention offers the following advantages: The sliding connection between the guide bushing and the extension guides the push plate's ejection stroke, preventing it from tilting towards the core's forming end and thus avoiding damage to that end. The guide bushing is fixed to and covers the inner wall of the perforation, completely preventing friction between the perforation's inner wall (i.e., the push plate's opening) and the core. Furthermore, the guide bushing's fastening via the conical surface of the perforation allows for quick assembly and disassembly. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the push-plate demolding mechanism in the embodiment;

[0015] Figure 2 This is an exploded view of the push-plate demolding mechanism in the embodiment;

[0016] Figure 3 This is a cross-sectional view of the push-plate demolding mechanism in the embodiment;

[0017] Figure 4 This is a schematic diagram of the trapezoidal block unit of the guide bushing in the embodiment. Detailed Implementation

[0018] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0019] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0020] See Figures 1-3As shown, in a preferred embodiment of this utility model, a push-plate type demolding mechanism is provided, including a push plate 1 and a core 2. The push plate 1 is provided with a through hole 10. The core 2 includes an extension 22 extending through the through hole 10 and a forming part 21 extending out of the through hole 10. The forming part 21 serves as a punch for injection molding of the product. After the product is injection molded, it moves from the push plate 1 towards the core 2 through the through hole 10. Figure 1 The product is demolded by ejecting the material using the M-direction (represented by the direction M).

[0021] The push-plate demolding mechanism also includes guide bushing 3, such as Figure 3 The guide bushing 3 surrounds the core 2 and is fixedly connected to the inner wall of the perforation 10. The guide bushing 3 and the extension 22 form a sliding fit. In this embodiment, the sliding fit between the guide bushing 3 and the extension 22 guides the push-plate 1's ejection stroke, preventing the push-plate 1 from tilting towards the forming end 21 of the core 2 and avoiding damage to the forming end 21. Furthermore, the guide bushing 3 replaces the push-plate 1 in friction with the core 2, extending the lifespan of the push-plate 1. The guide bushing 3 can be made of mold steel and electroplated to improve its wear resistance. Moreover, in this embodiment, the forming part 21 is smaller than the extension 22, further preventing friction between the guide bushing 3 and the forming part 21.

[0022] The guide bushing 3 can be directly screwed onto the inner wall of the through hole 10, making it detachable. If the guide bushing 3 is severely worn, it can be replaced. In this embodiment, the through hole 10 is a tapered hole that gradually narrows towards the ejection direction of the push plate 1, and the outer peripheral surface of the guide bushing 3 is a tapered surface that gradually narrows towards the ejection direction of the push plate 1. The abutment block 4 is fixedly connected to the push plate 1 and abuts against the guide bushing 3 towards the ejection direction of the push plate 1, so that the outer peripheral surface of the guide bushing 3 abuts against the inner wall of the through hole 10 to form a tapered surface fit. With this structure, once the abutment block 4 is removed, the guide bushing 3 can be quickly removed, which is more conducive to the replacement of the guide bushing 3. In this embodiment, the abutment block 4 is detachably screwed onto the push plate 1, and the abutment block 4 is located at the end of the through hole 10 away from the forming part 21, which makes it easier to install and remove the abutment block 4.

[0023] In this embodiment, the perforation 10 is a square hole, its shape matching the outer contour of the core 2. The guide bushing 3 is a square ring structure. The guide bushing 3 can be a one-piece ring structure, or it can be composed of multiple parts spliced ​​together to facilitate the replacement of the guide bushing 3, such as... Figure 4 In this embodiment, the guide bushing 3 is assembled from multiple trapezoidal block units 30 in a side-to-side connection manner. The guide bushing 3 mates with the conical surface of the perforation 10, so adjacent trapezoidal block units 30 can be attached together without additional bonding / screwing or other connection methods.

[0024] In this embodiment, the guide bushing 3 is fixed on the inner wall of the perforation 10 and covers the inner wall surface of the perforation 10, thereby completely avoiding friction between the inner wall of the perforation 10 (i.e., the opening of the push plate 1) and the core 2. By fixing the guide bushing 3 with the conical surface of the perforation 10, the guide bushing 3 can be quickly installed and removed.

[0025] Based on the aforementioned push-plate type demolding mechanism with guiding function, this embodiment also proposes an injection mold that includes the aforementioned push-plate type demolding mechanism and has the same technical effects as the structure.

[0026] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that any changes in form and detail made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims fall within the protection scope of the present invention.

Claims

1. A push plate type demolding mechanism comprising a push plate and a core, the push plate being provided with a through hole, the core comprising an extension portion penetrating through the through hole and a shaped portion penetrating out of the through hole, the shaped portion serving as a molding end for injection molding, the push plate being arranged to be ejected toward the core in a direction in which the core penetrates out of the through hole, characterized in that: It also includes a guide bushing, which is arranged around the core and is fixed against the inner wall of the perforation and forms a conical surface with the perforation for fixation. The guide bushing and the extension form a sliding fit. ​ 2. The pusher plate ejection mechanism of claim 1, wherein: The formed portion is smaller than the extended portion.

3. The pusher plate ejection mechanism of claim 1, wherein: It also includes a stop block, the through hole is a tapered hole that gradually narrows towards the ejection direction of the push plate, the outer peripheral surface of the guide bushing is a tapered surface that gradually narrows towards the ejection direction of the push plate, the stop block is fixedly connected to the push plate and abuts against the guide bushing in the ejection direction of the push plate, so that the outer peripheral surface of the guide bushing abuts against the inner wall of the through hole to form a tapered surface fit.

4. The pusher plate ejection mechanism of claim 3, wherein: The abutment block and the push plate are detachably screwed together.

5. The pusher plate ejection mechanism of claim 3, wherein: The abutment block is disposed at one end of the perforation away from the forming part.

6. The pusher plate ejection mechanism of claim 1, wherein: The perforation is a square hole, and the guide bushing is a square ring structure.

7. The push-plate type demolding mechanism according to claim 1, characterized in that: The guide bushing is assembled from multiple trapezoidal block units connected side by side.

8. An injection mold, characterized in that: Includes the push-plate demolding mechanism as described in any one of claims 1-7.

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