Rotary core-pulling mechanism for concave arc-shaped handle in injection mold
Patent Information
- Application Number
- CN202522056921.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-24
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-09-24
AI Technical Summary
[0002]采用注塑模具生产塑料件时，若塑料件的侧壁设置向下的翻边，且翻边中设置弧形扣手，弧形扣手中形成扣手凹槽，如塑料柜门、塑料抽屉侧壁中的扣手凹槽，传统的方式通常是将扣手凹槽的深度做小，以及将弧形扣手的高度降低，利用塑料材料的弹性变形能力，通过强脱的方式将扣手凹槽中的芯子抽出，一方面采用强脱的方式，芯子在抽出扣手凹槽时，容易导致弧形扣手被拉断，从而影响成品率；另一方面扣手凹槽的深度做小，弧形扣手的高度降低，不利于手指伸入槽中，人们在打开柜门或者拉出抽屉时，手指容易从扣手凹槽中滑脱出来
[0010]本实用新型一种注塑模具内凹弧形扣手的旋转抽芯机构的有益效果是：在模具开模后，通过第一油缸的活塞杆带动齿条上下移动，齿条与齿轮配合，带动齿轮旋转，齿轮带动旋转抽芯块旋转脱出翻边中的弧形扣手和扣手凹槽，利用齿条和齿轮的配合，带动旋转抽芯块的旋转抽芯结构，在保证扣手凹槽深度以及弧形扣手高度的前提下，塑料件能够顺利进行抽芯和脱模动作，产品的成品率高。
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Figure CN224809984U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to injection molds, and in particular to a rotating core-pulling mechanism for a concave arc-shaped handle in an injection mold. Background Technology
[0002] When producing plastic parts using injection molds, if the sidewall of the plastic part has a downward-facing flange with an arc-shaped handle in the flange, forming a handle groove in the arc-shaped handle, such as the handle groove in the sidewall of a plastic cabinet door or drawer, the traditional method is to reduce the depth of the handle groove and lower the height of the arc-shaped handle. This is done by utilizing the elastic deformation ability of the plastic material to forcefully pull out the core from the handle groove. However, this forceful extraction method can easily cause the arc-shaped handle to break when the core is pulled out of the handle groove, thus affecting the yield rate. Furthermore, reducing the depth of the handle groove and lowering the height of the arc-shaped handle makes it difficult for fingers to reach into the groove, and fingers can easily slip out of the handle groove when people open cabinet doors or pull out drawers. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a rotating core-pulling mechanism for a concave arc-shaped handle in an injection mold, which ensures smooth demolding of plastic parts and a high yield rate while guaranteeing the depth of the handle groove and the height of the arc-shaped handle.
[0004] The technical solution of this utility model for a rotating core-pulling mechanism for a concave arc-shaped handle in an injection mold 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 ejector structure 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 ejector structure. A movable template is provided on the mold feet. A mold cavity is formed between the movable template and the fixed template. A plastic part is injection molded in the mold cavity. The side wall of the plastic part has a downward-facing flange. An arc-shaped handle is provided in the flange. A handle groove is formed in the arc-shaped handle. A corresponding groove is formed on the inner wall of the arc-shaped handle. The corresponding arc-shaped protrusion has an outer core-pulling slider on the outer wall of the moving template. The outer core-pulling slider moves left and right along the moving template via a pull-out structure. A gear is installed in the outer core-pulling slider, and the gear is rotatably connected to the outer core-pulling slider via a rotating shaft. A rotating core-pulling block is installed on the gear, and one side of the rotating core-pulling block cooperates with the handle groove. An elongated groove is opened below the outer core-pulling slider on the moving template. A first oil cylinder is installed below the elongated groove. The first oil cylinder is fixed to the outer core-pulling slider by a first bolt passing through the elongated groove. The piston rod of the first oil cylinder is connected to a rack, and one side of the rack meshes with the gear.
[0005] Furthermore, the ejection structure includes an upper ejector plate and a lower ejector plate, with a slide block provided on the upper and lower ejector plates. A small slider is provided in the slide block and slides with the slide block. An inclined ejector rod is provided on the small slider. The lower end of the inclined ejector rod is connected to the small slider via a fixed shaft. The upper end of the inclined ejector rod passes through the moving template and connects to the inner core-pulling block. The upper end of the inner core-pulling block contacts the lower part of the plastic part, and one side of the inner core-pulling block cooperates with the inner wall of the arc-shaped protrusion.
[0006] Furthermore, the pull-out structure includes a fixed base, which is fixed to the moving template by a second bolt. A second hydraulic cylinder is installed on the fixed base, and the piston rod of the second hydraulic cylinder is connected to the outer core-pulling slider.
[0007] Furthermore, a limiting block is provided in the outer core-pulling slider, and the other side of the rotating core-pulling block cooperates with the limiting block.
[0008] Furthermore, guide posts are provided between the lower cover plate and the moving template, and guide holes are opened in the upper ejector plate and the lower ejector plate, with the guide holes cooperating with the guide posts.
[0009] Furthermore, a guide sleeve is provided in the guide hole, and the guide sleeve cooperates with the guide post.
[0010] The beneficial effects of this utility model of a rotating core-pulling mechanism for a concave arc-shaped handle in an injection mold are as follows: After the mold is opened, the piston rod of the first oil cylinder drives the rack to move up and down. The rack and gear cooperate to drive the gear to rotate. The gear drives the rotating core-pulling block to rotate and disengage from the arc-shaped handle and handle groove in the flange. By utilizing the cooperation of the rack and gear, the rotating core-pulling structure of the rotating core-pulling block is driven. Under the premise of ensuring the depth of the handle groove and the height of the arc-shaped handle, the plastic part can smoothly perform the core-pulling and demolding actions, resulting in a high product yield. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the mold-closing state structure of a rotary core-pulling mechanism for a concave arc-shaped handle in an injection mold according to this utility model. Figure 2 This is a schematic diagram of the mold opening state structure of a rotary core-pulling mechanism for a concave arc-shaped handle in an injection mold according to this utility model. Figure 3 This is a schematic diagram of the rotating core-pulling block rotating out of the handle groove in a rotating core-pulling mechanism for a concave arc-shaped handle in an injection mold, according to this utility model. Figure 4 This is a schematic diagram of the pull-out structure of the rotary core-pulling mechanism of the concave arc-shaped handle of an injection mold, which drives the outer core-pulling slider to pull outwards. Figure 5 This is a schematic diagram of the plastic part ejection state of a rotating core-pulling mechanism for a concave arc-shaped handle in an injection mold, according to this utility model.
[0012] In the diagram, 1. Upper cover plate; 2. Lower cover plate; 3. Fixed template; 4. Perforation; 5. Mold foot; 6. Ejector rod; 7. Moving template; 8. Plastic part; 9. Flanged edge; 10. Arc-shaped handle; 11. Handle groove; 12. Arc-shaped protrusion; 13. Outer core-pulling slider; 14. Gear; 15. Rotating shaft; 16. Rotating core-pulling block; 17. Long groove; 18. First hydraulic cylinder; 19. First bolt; 20. Rack; 21. Upper ejector plate; 22. Lower ejector plate; 23. Slide seat; 24. Small slider; 25. Angled ejector rod; 26. Fixed shaft; 27. Inner core-pulling block; 28. Fixed seat; 29. Second bolt; 30. Second hydraulic cylinder; 31. Limiting block; 32. Guide post; 33. Guide hole; 34. Guide sleeve. 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 rotating core-pulling mechanism for a concave arc-shaped handle in an injection mold, such as... Figure 1 — Figure 5 As 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 provided in the lower platen 2. A mold foot 5 is provided on the lower platen 2. An ejector structure 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 structure. A movable template 7 is provided on the mold foot 5. A mold cavity is formed between the movable template 7 and the fixed template 3. A plastic part 8 is injection molded in the mold cavity. The side wall of the plastic part 8 is provided with a downward flange 9. An arc-shaped handle 10 is provided in the flange 9. A handle groove 11 is formed in the arc-shaped handle 10. A corresponding arc-shaped protrusion 12 is formed on the inner wall of the arc-shaped handle 10. The movable template 7 is located on the outer wall of the flange 9. An external core-pulling slider 13 is driven by a pull-out structure to move left and right along a moving template 7. A gear 14 is installed in the external core-pulling slider 13, and the gear 14 is rotatably connected to the external core-pulling slider 13 via a rotating shaft 15. A rotating core-pulling block 16 is installed on the gear 14, and one side of the rotating core-pulling block 16 engages with a handle groove 11. The moving template 7 is located below the external core-pulling slider 13 and has an elongated groove 17. A first hydraulic cylinder 18 is installed below the elongated groove 17 and is fixed to the external core-pulling slider 13 by a first bolt 19 passing through the elongated groove 17. The piston rod of the first hydraulic cylinder 18 is connected to a rack 20, and one side of the rack 20 meshes with the gear 14.
[0018] Furthermore, the ejection structure includes an upper ejector plate 21 and a lower ejector plate 22. A slide block 23 is provided on the upper ejector plate 21 and the lower ejector plate 22. A small slider 24 is provided in the slide block 23. The small slider 24 slides with the slide block 23. An inclined ejector rod 25 is provided on the small slider 24. The lower end of the inclined ejector rod 25 is connected to the small slider 24 via a fixed shaft 26. The upper end of the inclined ejector rod 25 passes through the moving template 7 and connects to the inner core-pulling block 27. The upper end of the inner core-pulling block 27 contacts the lower part of the plastic part 8. One side of the inner core-pulling block 27 cooperates with the inner wall of the arc-shaped protrusion 12.
[0019] Furthermore, the pull-out structure includes a fixed seat 28, which is fixed to the moving template 7 by a second bolt 29. A second hydraulic cylinder 30 is provided on the fixed seat 28, and the piston rod of the second hydraulic cylinder 30 is connected to the outer core-pulling slider 13.
[0020] Furthermore, a limiting block 31 is provided in the outer core-pulling slider 13, and the other side of the rotating core-pulling block 16 cooperates with the limiting block 31. With the limiting block 31, when the rotating core-pulling block 16 rotates to pull out the arc-shaped handle 10 and the handle groove 11, the rotating core-pulling block 16 contacts the limiting block 31, and the limiting block 31 plays a limiting role for it.
[0021] Furthermore, a guide post 32 is provided between the lower cover plate 2 and the moving template 7, and guide holes 33 are opened in the upper ejector plate 21 and the lower ejector plate 22, which cooperate with the guide post 32. With the guide post 32 and the guide hole 33, the movement of the upper and lower ejector plates 21 and 22 can be guided, ensuring that their operation is more accurate and reliable.
[0022] Furthermore, a guide sleeve 34 is provided in the guide hole 33, and the guide sleeve 34 cooperates with the guide post 32. The guide sleeve 34 increases its wear resistance and ensures its service life.
[0023] This utility model discloses a rotating core-pulling mechanism for a concave arc-shaped handle in an injection mold. After the plastic part 8 is injection molded, the injection molding machine drives the lower platen 2 to move downwards. The lower platen 2 drives the mold foot 5, ejector structure, moving platen 7, plastic part 8, outer core-pulling slider 13, gear 14, rotating core-pulling block 16, first oil cylinder 18, and pull-out structure to move downwards together, while the upper platen 1 and fixed platen 3 remain stationary, so that the mold gradually opens from the fixed platen 3 and moving platen 7. At this time, the piston rod of the first oil cylinder 18 drives the rack 20 to move downwards, and the rack 20 drives the gear 14 to rotate clockwise around the rotating shaft 15. The gear 14 drives the rotating core-pulling block 16 to rotate clockwise and disengage the arc-shaped handle 10 and handle groove 11 in the flange 9. Then, the piston rod of the second oil cylinder 30 of the pull-out structure drives the outer core-pulling slider 13 to move outwards, so that the outer core-pulling slider 13 gradually moves away from the plastic part. The flange 9 of part 8, the outer core-pulling slider 13 drives the gear 14, the rotating core-pulling block 16, and the first oil cylinder 18 to move outward together, away from the plastic part 8. Finally, the ejector rod 6 of the injection molding machine pushes the upper ejector plate 21 and the lower ejector plate 22 of the ejection structure to move upward. The upper and lower ejector plates 21 and 22 drive the slide block 23, the small slider 24, the inclined ejector rod 25, and the inner core-pulling block 27 to move upward together. When the inclined ejector rod 25 moves upward, it moves along the inclined hole in the moving template 7. Under the guidance of the inclined hole, the upper end of the inclined ejector rod 25 drives the inner core-pulling block 27 to gradually move inward. At the same time, the inner core-pulling block 27 pushes the plastic part 8 upward to eject it from the mold, and the inner core-pulling block 27 disengages from the arc-shaped protrusion 12 on the inner wall of the plastic part 8. The lower end of the inclined ejector rod 25 slides to one side along the slide block 23 through the fixed shaft 26 and the small slider 24. Finally, the plastic part 8 can be taken out and demolded.
[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 rotating core-pulling mechanism for a concave arc-shaped handle in an injection mold, comprising an upper plate (1) and a lower plate (2), wherein a fixed template (3) is provided under the upper plate (1), a through hole (4) is provided in the lower plate (2), a mold foot (5) is provided on the lower plate (2), an ejector structure is provided on the lower plate (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 ejector structure, a movable template (7) is provided on the mold foot (5), a mold cavity is formed between the movable template (7) and the fixed template (3), a plastic part (8) is injection molded in the mold cavity, a downward flange (9) is provided on the side wall of the plastic part (8), an arc-shaped handle (10) is provided in the flange (9), a handle groove (11) is formed in the arc-shaped handle (10), and a corresponding arc-shaped protrusion (12) is formed on the inner wall of the arc-shaped handle (10), characterized in that: The moving template (7) is provided with an outer core-pulling slider (13) on the outer wall of the flange (9). The outer core-pulling slider (13) is driven by the pull-out structure to move left and right along the moving template (7). A gear (14) is provided in the outer core-pulling slider (13). The gear (14) is rotatably connected to the outer core-pulling slider (13) via a rotating shaft (15). A rotating core-pulling block (16) is provided on the gear (14). One side of the rotating core-pulling block (16) is engaged with the handle groove (11). The moving template (7) is provided with a long groove (17) below the outer core-pulling slider (13). A first oil cylinder (18) is provided below the long groove (17). The first oil cylinder (18) is fixed to the outer core-pulling slider (13) through the long groove (17) via a first bolt (19). The piston rod of the first oil cylinder (18) is connected to a rack (20). One side of the rack (20) is engaged with the gear (14).
2. The rotary core-pulling mechanism for a concave arc-shaped handle in an injection mold as described in claim 1, characterized in that: The ejection structure includes an upper ejector plate (21) and a lower ejector plate (22). A slide block (23) is provided on the upper ejector plate (21) and the lower ejector plate (22). A small slider (24) is provided in the slide block (23). The small slider (24) slides with the slide block (23). An inclined push rod (25) is provided on the small slider (24). The lower end of the inclined push rod (25) is connected to the small slider (24) via a fixed shaft (26). The upper end of the inclined push rod (25) passes through the moving template (7) and connects to the inner core-pulling block (27). The upper end of the inner core-pulling block (27) contacts the lower part of the plastic part (8). One side of the inner core-pulling block (27) is engaged with the inner wall of the arc-shaped protrusion (12).
3. The rotary core-pulling mechanism for a concave arc-shaped handle in an injection mold as described in claim 1, characterized in that: The pull-out structure includes a fixed seat (28), which is fixed to the moving template (7) by a second bolt (29). A second oil cylinder (30) is provided on the fixed seat (28), and the piston rod of the second oil cylinder (30) is connected to the outer core-pulling slider (13).
4. The rotary core-pulling mechanism for a concave arc-shaped handle in an injection mold as described in claim 1, characterized in that: The outer core-pulling slider (13) is provided with a limiting block (31), and the other side of the rotating core-pulling block (16) cooperates with the limiting block (31).
5. The rotary core-pulling mechanism for a concave arc-shaped handle in an injection mold as described in claim 1, characterized in that: A guide post (32) is provided between the lower cover plate (2) and the moving template (7), and a guide hole (33) is opened in the upper ejector plate (21) and the lower ejector plate (22), and the guide hole (33) cooperates with the guide post (32).
6. The rotary core-pulling mechanism for a concave arc-shaped handle in an injection mold as described in claim 5, characterized in that: A guide sleeve (34) is provided in the guide hole (33), and the guide sleeve (34) cooperates with the guide post (32).