Injection mold triangular slider type secondary ejection mechanism

Abstract

The utility model discloses a triangular slider type secondary ejection mechanism of injection mold, including upper counterplate and lower counterplate, and the lower counterplate is provided with fixed mold plate, and the lower counterplate is provided with the ejection device and the mould foot, and the mould foot is provided with movable mold plate, and the movable mold plate is provided with the material removal plate, and the fixed mold plate, movable mold plate, material removal plate have the plastic piece between, and the plastic piece is provided with the downward flanging around, and the flanging outer wall is provided with the clamping groove, and the material removal plate is matched with the flanging and clamping groove, and the ejection device includes the first ejection assembly, and the first ejection assembly is provided with the second ejection assembly below, and the triangular slider is set between the first ejection assembly and the second ejection assembly, and the lower part of triangular slider is slidably connected with the second ejection assembly, and the first upper inclined surface and the second upper inclined surface are set on triangular slider, and the first lower inclined surface is set on the inner wall of mould foot and is matched with the first upper inclined surface, and the second lower inclined surface is set below the first ejection assembly and is matched with the second upper inclined surface.

Description

Technical Field

[0001] This utility model relates to injection molds, and in particular to a triangular slider type secondary ejection mechanism for injection molds. Background Technology

[0002] When producing plastic parts using injection molds, if the plastic parts require secondary ejection, such as when the plastic parts have downward-facing flanges around their perimeter and grooves around the flanges, the clamping force of the flanges on the moving mold plate is relatively large. If the plastic parts are directly ejected from the mold using ejector pins, ejector pin marks may easily appear on the plastic parts at the ejector pin positions, or even the ejector pins may bend due to insufficient strength. Therefore, it is usually necessary to first use the ejection device to drive the stripper plate under the flanges to eject the plastic parts upwards for demolding, and then use the secondary ejection structure to drive the ejector pins to eject the plastic parts a second time so that the groove positions are removed from the stripper plate. Existing secondary ejection structures, such as those disclosed in CN109501070A, describe "a secondary ejection mechanism and a mold using the secondary ejection mechanism." The mold includes an upper mold and a lower mold, with an ejector plate, ejector pins, and a secondary ejection mechanism positioned between the lower mold and the mold base plate. The secondary ejection mechanism includes a fixed cover plate connected to the upper ejector plate, with a limiting groove on the fixed cover plate. A sliding block is provided within the lower ejector plate, and an elastic element is provided between the sliding block and the lower ejector plate. A guide rod is passed through the fixed cover plate, fixedly connected to the mold base plate, and has a sliding groove on the guide rod. The upper ejector plate drives the lower ejector plate to move synchronously, achieving a primary ejection action; the sliding groove compresses the sliding block into the lower ejector plate, while the upper ejector plate moves independently, achieving a secondary ejection action. The disadvantages of this structure are: First, the secondary ejection mechanism is located on the outer wall of the lower mold, mold base plate and ejector plate, which occupies the external space of the mold, resulting in an increase in mold volume. It requires a larger tonnage injection molding machine to drive it, which increases the manufacturing cost. Second, the structure of this secondary ejection mechanism is more complex, with more parts, making it more troublesome to manufacture and more expensive. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a triangular slider type secondary ejection mechanism for injection molds that is simple in structure, easy to manufacture, reduces mold manufacturing costs, and ensures that plastic parts can be smoothly ejected.

[0004] The technical solution of this utility model for a triangular slider-type secondary ejection mechanism for injection molds is as follows: It includes an upper plate and a lower plate. A fixed template is provided under the upper plate. A through hole is formed in the lower plate. Mold feet are provided on the lower plate. An ejection device is provided on the lower plate between the mold feet. The ejector rod of the injection molding machine passes through the through hole and cooperates with the ejection device. A movable template is provided on the mold feet. A stripper plate is provided on the movable template. A mold cavity is formed between the fixed template, the movable template, and the stripper plate. A plastic part is injection molded in the mold cavity. The plastic part has downward-facing flanges around its perimeter. A groove is formed on the outer wall of the flange. The stripper plate cooperates with the flanges and the groove. The ejection device... The device includes a first ejector assembly, the upper part of which mates with a plastic part. A second ejector assembly is located below the first ejector assembly, the upper part of which is connected to a stripper plate, and the lower part of which mates with an ejector rod. A triangular slider is provided between the first and second ejector assemblies, the lower part of which slides with the second ejector assembly. The triangular slider is provided with a first and a second upward inclined guide surface. The inner wall of the mold base is provided with a first downward inclined guide surface, which mates with the first upward inclined guide surface. A second downward inclined guide surface is located below the first ejector assembly, which mates with the second upward inclined guide surface.

[0005] Furthermore, the first ejector assembly includes a first upper ejector plate and a first lower ejector plate, which are fixed together by fasteners. Ejector pins are provided on the first upper ejector plate and the first lower ejector plate, with the upper ends of the ejector pins passing through the movable template and contacting the lower part of the plastic part. A second lower inclined guide surface is provided on the sidewall of the first upper ejector plate and the first lower ejector plate, which cooperates with the second upper inclined guide surface.

[0006] Furthermore, the second ejection assembly includes a second upper ejector plate and a second lower ejector plate, which are fixed together by fasteners. A stripping rod is provided on the second upper ejector plate and the second lower ejector plate, and the upper end of the stripping rod passes through the first ejection assembly and the moving template and is fixedly connected to the stripping plate.

[0007] Furthermore, a first guide post is provided between the lower cover plate and the moving template, and a first guide hole is opened in the first ejection assembly and the second ejection assembly respectively, with the first guide hole cooperating with the first guide post.

[0008] Furthermore, a second guide post is provided in the moving template, and second guide holes are respectively opened in the fixed template and the stripper plate, with the second guide holes cooperating with the second guide post.

[0009] Furthermore, the triangular slider consists of two parts, left and right, with a first downward inclined guide surface provided on the inner wall of each of the left and right mold feet, and a second downward inclined guide surface provided on both sides of the first ejector assembly.

[0010] The beneficial effects of this utility model of a triangular slider-type secondary ejection mechanism for injection molds are as follows: By setting a triangular slider between the first ejection assembly and the second ejection assembly, after the plastic part is ejected from the moving platen by the stripper plate for the first time, the first upper inclined guide surface on one side of the triangular slider cooperates with the first lower inclined guide surface on the inner wall of the mold foot, and the second upper inclined guide surface on the other side of the triangular slider cooperates with the second lower inclined guide surface on the side wall of the second ejection assembly. This allows the second ejection assembly to move upwards more quickly, driving the ejector pin to eject the plastic part from the stripper plate for the second time, thus achieving secondary ejection. The triangular slider has a simple structure and is easy to manufacture. Furthermore, since it is set inside the mold, it does not occupy external space of the mold and does not increase the mold volume, making the mold structure compact and reducing the manufacturing cost of the mold. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the mold closing state structure of the triangular slider type secondary ejection mechanism for injection molds of this utility model; Figure 2 This is a schematic diagram of the mold opening state structure of the triangular slider type secondary ejection mechanism of the injection mold of this utility model; Figure 3 This is a schematic diagram of the plastic part ejection state of the triangular slider type secondary ejection mechanism of the injection mold of this utility model; Figure 4 This is a schematic diagram of the secondary ejection state of the plastic part in the triangular slider type secondary ejection mechanism of the injection mold of this utility model. Figure 5 yes Figure 4 A magnified view of part A.

[0012] In the diagram, 1. Upper cover plate; 2. Lower cover plate; 3. Fixed template; 4. Through hole; 5. Mold foot; 6. Ejector pin; 7. Moving template; 8. Stripper plate; 9. Plastic part; 10. Flanged edge; 11. Slot; 12. Triangular slider; 13. First upper inclined guide surface; 14. Second upper inclined guide surface; 15. First lower inclined guide surface; 16. Second lower inclined guide surface; 17. First upper ejector plate; 18. First lower ejector plate; 19. Ejector pin; 20. Second upper ejector plate; 21. Second lower ejector plate; 22. Stripper rod; 23. First guide post; 24. First guide hole; 25. Second guide post; 26. Second guide hole. Detailed Implementation

[0013] To enable those skilled in the art to better understand the technical solution of this utility model, the preferred embodiments of this utility model are described below in conjunction with specific examples. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote elements with the same or similar functions throughout. However, it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting this utility model. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size. It is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this utility model.

[0014] It should be noted that the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this utility model are intended to cover non-exclusive inclusion. The terms "set," "equipped with," "installed," "connected," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two mechanisms, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0015] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the mechanism or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first" and "second" are also used only for the sake of brevity in description and do not indicate or imply relative importance.

[0016] To further illustrate the content, features, and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and examples, but it should not be construed as a basis for limiting this utility model.

[0017] This utility model relates to a triangular slider type secondary ejection mechanism for injection molds, such as... Figure 1 — Figure 5As shown, the system includes an upper platen 1 and a lower platen 2. A fixed template 3 is provided under the upper platen 1. A through hole 4 is formed in the lower platen 2, and mold feet 5 are provided on the lower platen 2. An ejector device is provided on the lower platen 2 between the mold feet 5. The ejector rod 6 of the injection molding machine passes through the through hole 4 and cooperates with the ejector device. A movable template 7 is provided on the mold feet 5, and a stripper plate 8 is provided on the movable template 7. A mold cavity is formed between the fixed template 3, the movable template 7, and the stripper plate 8. A plastic part 9 is injection molded in the mold cavity. The plastic part 9 has downward flanges 10 around its perimeter, and a groove 11 is formed on the outer wall of the flanges 10. The stripper plate 8 cooperates with the flanges 10 and the grooves 11. The ejector device includes a first ejector assembly. The upper part of the first ejector assembly mates with the plastic part 9. A second ejector assembly is provided below the first ejector assembly. The upper part of the second ejector assembly is connected to the stripper plate 8, and the lower part of the second ejector assembly mates with the ejector rod 6. A triangular slider 12 is provided between the first ejector assembly and the second ejector assembly. The lower part of the triangular slider 12 is slidably engaged with the second ejector assembly. A first upper inclined guide surface 13 and a second upper inclined guide surface 14 are provided on the triangular slider 12. A first lower inclined guide surface 15 is provided on the inner wall of the mold foot 5. The first lower inclined guide surface 15 mates with the first upper inclined guide surface 13. A second lower inclined guide surface 16 is provided below the first ejector assembly. The second lower inclined guide surface 16 mates with the second upper inclined guide surface 14.

[0018] Furthermore, the first ejector assembly includes a first upper ejector plate 17 and a first lower ejector plate 18, which are fixed together by fasteners. Ejector pins 19 are provided on the first upper ejector plate 17 and the first lower ejector plate 18, with the upper end of the ejector pin 19 passing through the movable template 7 and contacting the lower part of the plastic part 9. A second lower inclined guide surface 16 is provided on the side wall of the first upper ejector plate 17 and the first lower ejector plate 18, which cooperates with the second upper inclined guide surface 14.

[0019] Furthermore, the second ejection assembly includes a second upper ejector plate 20 and a second lower ejector plate 21. The second upper ejector plate 20 and the second lower ejector plate 21 are fixed together by fasteners. A stripping rod 22 is provided on the second upper ejector plate 20 and the second lower ejector plate 21. The upper end of the stripping rod 22 passes through the first ejection assembly and the moving template 7 and is fixedly connected to the stripping plate 8.

[0020] Furthermore, a first guide post 23 is provided between the lower cover plate 2 and the moving template 7, and first guide holes 24 are respectively opened in the first ejection assembly and the second ejection assembly, with the first guide holes 24 cooperating with the first guide post 23. With the first guide post 23 and the first guide hole 23, the up and down movement of the first ejection assembly and the second ejection assembly can be guided, making their movements more precise.

[0021] Furthermore, a second guide post 25 is provided in the moving mold plate 7, and second guide holes 26 are respectively opened in the fixed mold plate 3 and the stripper plate 8. The second guide holes 26 cooperate with the second guide post 25. With the second guide post 25 and the second guide hole 26, the opening and closing action of the moving mold plate 7 and the fixed mold plate 3 can be guided, as well as the up and down movement of the stripper plate 8, making its action more precise.

[0022] Furthermore, there are two triangular sliders 12, one on the left and one on the right. Correspondingly, a first downward inclined guide surface 15 is provided on the inner wall of the left and right mold feet 5, and a second downward inclined guide surface 16 is provided on both sides of the first ejector assembly. The two triangular sliders 12 can contact both sides of the first ejector assembly, ensuring that the upward ejection action of the first ejector assembly is smoother and more reliable.

[0023] This utility model discloses a triangular slider type secondary ejection mechanism for injection molds. After the plastic part 9 is injection molded, the injection molding machine drives the lower cover plate 2, mold feet 5, ejection device, moving platen 7, stripper plate 8, and plastic part 9 to move downwards together, while the upper cover plate 1 and fixed platen 3 remain stationary, allowing the mold to gradually open from the fixed platen 3 and moving platen 7. When the second lower ejector plate 21 of the second ejection assembly of the ejection device contacts the ejector rod 6 of the injection molding machine, the ejector rod 6 stops the movement of the second lower ejector plate 21 and the second upper ejector plate 20. The second upper and lower ejector plates 20 and 21 drive the stripper rod 22, triangular slider 12, and the first ejection assembly to stop moving downwards. The stripper rod 22 drives the stripper plate 8 to stop moving, and the stripper plate 8 supports the flanges 10 around the plastic part 9. The lower platen 2 drives the mold feet 5 and the moving platen 7 to continue moving downwards, causing the plastic part 9 to gradually come out of the moving platen 7. Meanwhile, the slot 11 of the plastic part 9 is still stuck on the stripper plate 8. At this time, the first lower inclined guide surface 15 on the inner wall of the mold feet 5 cooperates with the first upper inclined guide surface 13 of the triangular slider 12. Under its guiding action, the triangular slider 12 is pushed to move towards the side of the first ejector assembly. The second upper inclined guide surface 14 of the triangular slider 12 cooperates with the second lower inclined guide surface 16 on the side wall of the first upper ejector plate 17 and the first lower ejector plate 18 of the first ejector assembly, so that the first ejector assembly moves upwards more quickly relative to the second ejector assembly. The first ejector assembly drives the ejector pin 19 to move upwards more quickly, so that the ejector pin 19 pushes the slot 11 of the plastic part 9 out of the stripper plate 8, completing the demolding.

[0024] Although the embodiments of this application disclose the above-described methods, the content is merely an implementation method adopted for ease of understanding. Any person skilled in the art should understand that any modifications and changes in the form and details of the implementation can be made without departing from the spirit and scope disclosed in this utility model. However, the patent protection scope of this utility model shall still be determined by the scope defined in the appended claims.

Claims

1. A triangular slider type secondary ejection mechanism for injection mold, comprising an upper platen (1) and a lower platen (2), wherein a fixed template (3) is provided under the upper platen (1), a through hole (4) is provided in the lower platen (2), a mold foot (5) is provided on the lower platen (2), an ejection device is provided on the lower platen (2) between the mold feet (5), an ejector rod (6) of an injection molding machine passes through the through hole (4) and cooperates with the ejection device, a movable template (7) is provided on the mold foot (5), a stripper plate (8) is provided on the movable template (7), a mold cavity is formed between the fixed template (3), the movable template (7), and the stripper plate (8), and a plastic part (9) is injection molded in the mold cavity, a downward flange (10) is provided around the plastic part (9), a slot (11) is provided on the outer wall of the flange (10), and the stripper plate (8) cooperates with the flange (10) and the slot (11), characterized in that: The ejection device includes a first ejection assembly, the upper part of which cooperates with the plastic part (9), a second ejection assembly is provided below the first ejection assembly, the upper part of which is connected to the stripper plate (8), the lower part of which cooperates with the ejector rod (6), a triangular slider (12) is provided between the first ejection assembly and the second ejection assembly, the lower part of which is slidably cooperates with the second ejection assembly, a first upper inclined guide surface (13) and a second upper inclined guide surface (14) are provided on the triangular slider (12), a first lower inclined guide surface (15) is provided on the inner wall of the mold foot (5), the first lower inclined guide surface (15) cooperates with the first upper inclined guide surface (13), a second lower inclined guide surface (16) is provided below the first ejection assembly, the second lower inclined guide surface (16) cooperates with the second upper inclined guide surface (14).

2. The injection mold triangular slider type secondary ejection mechanism as described in claim 1, characterized in that: The first ejector assembly includes a first upper ejector plate (17) and a first lower ejector plate (18). The first upper ejector plate (17) and the first lower ejector plate (18) are fixed together by fasteners. Ejector pins (19) are provided on the first upper ejector plate (17) and the first lower ejector plate (18). The upper end of the ejector pin (19) passes through the moving template (7) and contacts the lower part of the plastic part (9). The side walls of the first upper ejector plate (17) and the first lower ejector plate (18) are provided with a second lower inclined guide surface (16). The second lower inclined guide surface (16) cooperates with the second upper inclined guide surface (14).

3. The injection mold triangular slider type secondary ejection mechanism as described in claim 1, characterized in that: The second ejection assembly includes a second upper ejector plate (20) and a second lower ejector plate (21). The second upper ejector plate (20) and the second lower ejector plate (21) are fixed together by fasteners. A stripping rod (22) is provided on the second upper ejector plate (20) and the second lower ejector plate (21). The upper end of the stripping rod (22) passes through the first ejection assembly and the moving template (7) and is fixedly connected to the stripping plate (8).

4. The injection mold triangular slider type secondary ejection mechanism as described in claim 1, characterized in that: A first guide post (23) is provided between the lower cover plate (2) and the moving template (7), and a first guide hole (24) is opened in the first ejection assembly and the second ejection assembly respectively. The first guide hole (24) cooperates with the first guide post (23).

5. The injection mold triangular slider type secondary ejection mechanism as described in claim 1, characterized in that: The moving template (7) is provided with a second guide post (25), and the fixed template (3) and the stripper plate (8) are respectively provided with second guide holes (26), which are matched with the second guide post (25).

6. The injection mold triangular slider type secondary ejection mechanism as described in claim 1, characterized in that: The triangular slider (12) consists of two parts, left and right. Correspondingly, a first lower inclined guide surface (15) is provided on the inner wall of the left and right mold feet (5), and a second lower inclined guide surface (16) is provided on both sides of the first ejector assembly.

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