Internal ejection mechanism for injection mold slide
By using the linkage design of the arc-shaped core-pulling rod and the push-pull rod, as well as the cooperation of the delayed slide and the limit baffle, the problems of plastic part deformation and mold wear during the demolding process of injection mold are solved, achieving smooth core pulling of plastic parts and improving the durability of the mold.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHEJIANG KAIHUA MOLDS
- Filing Date
- 2026-04-01
- Publication Date
- 2026-06-09
AI Technical Summary
During the demolding process, plastic parts are prone to deformation, tearing, or cracking in existing injection molds, and the molds suffer severe wear, resulting in a decrease in product qualification rate and a shortened mold life.
The design employs a linkage between an arc-shaped core-pulling rod and a push-pull rod, combined with the cooperation of a delayed slide and a limit baffle, to achieve timing control of the rotational core-pulling action of the arc-shaped groove and the lateral core-pulling action, ensuring a smooth and reliable core-pulling process.
This avoids deformation and tearing of plastic parts, improves product qualification rate, reduces mold wear, and extends mold life.
Smart Images
Figure CN122165599A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to injection molds, and more particularly to a release mechanism inside the slider of an injection mold. Background Technology
[0002] When producing plastic parts using injection molds, if the plastic parts have downward-facing flanges around their perimeter, and horizontal side panels are installed on the outer walls of the flanges, with inward-sloping arc-shaped grooves below the side panels, the existing method is usually to minimize the curvature and angle of the arc-shaped grooves to make them as vertical as possible, and then eject them directly upwards through a forced ejection method. However, this forced ejection method can easily cause deformation, tearing, or even breakage of the plastic parts, resulting in a significant decrease in product qualification rate. Furthermore, the forced ejection process causes severe wear on the mold, shortening the mold's lifespan and increasing maintenance costs. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an internal unhooking mechanism for injection mold sliders that enables plastic parts to be easily pulled out of the mold core, avoids deformation, tearing or cracking of plastic parts, improves product qualification rate, and at the same time reduces mold wear and extends mold service life.
[0004] The technical solution of the internal unhooking mechanism of the injection mold slider of the present invention 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 assembly 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 assembly. A movable template is provided on the mold feet. A side core-pulling slider is provided on the movable template. The side core-pulling slider is driven by a hydraulic cylinder. A mold cavity is formed between the fixed template, the movable template, and the side core-pulling slider. A plastic part is injection molded in the mold cavity. The plastic part has downward-facing flanges around its perimeter, and a transverse side panel is provided on the outer wall of the flanges. An inwardly inclined arc-shaped groove is provided under the side panel. The side core-pulling slider has an installation groove, an inner sliding groove, and a delay sliding groove. An arc-shaped core-pulling rod is provided in the installation groove. The upper end of the arc-shaped core-pulling rod passes through the side core-pulling slider and cooperates with the arc-shaped groove. A rotating rod is provided on the side wall of the arc-shaped core-pulling rod. The rotating rod is rotatably connected to the installation groove via a rotating shaft. A sliding hole is provided at the lower part of the arc-shaped core-pulling rod. A push-pull rod is provided in the inner sliding groove and the delay sliding groove. One end of the push-pull rod is connected to the sliding hole via a pin. A protruding limiting baffle is provided at the other end of the push-pull rod. The piston rod of the hydraulic cylinder passes through the side core-pulling slider and connects to the limiting baffle. The limiting baffle cooperates with the delay sliding groove.
[0005] Furthermore, a protruding limiting block is provided on the moving template, and a limiting groove is provided under the side core-pulling slider, with the limiting groove and the limiting block engaging in a limiting fit.
[0006] Furthermore, the ejection assembly includes an upper ejector plate and a lower ejector plate. The ejector rod of the injection molding machine passes through a perforation and cooperates with the lower ejector plate. Ejector pins are provided on the upper and lower ejector plates, and the ejector pins cooperate with the bottom of the plastic part.
[0007] The beneficial effects of the internal unhooking mechanism of the injection mold slider of the present invention are: 1. Through the linkage design of the arc-shaped core-pulling rod and the push-pull rod, the rotational core-pulling action of the arc-shaped groove is realized. The trajectory of this action matches the inclination angle and curvature of the arc-shaped groove. The core-pulling process is smooth and reliable, and will not exert forced pulling on the plastic part. This ensures that the arc-shaped core-pulling rod can be smoothly pulled out of the arc-shaped groove of the plastic part, avoiding deformation, tearing or cracking of the plastic part, improving the product qualification rate, and reducing mold wear and extending the mold service life. Second, the combination of the delayed slide and the limit baffle realizes the timing control of arc-shaped core pulling and side core pulling, ensuring that the side core pulling slider only starts to move after the arc-shaped core pulling rod has completely exited the arc-shaped groove. The two actions are precisely connected and do not interfere with each other, ensuring the reliability of demolding. Attached Figure Description
[0008] Figure 1 This is a schematic diagram of the mold closing state structure of the internal unhooking mechanism of the injection mold slider of the present invention; Figure 2 This is a schematic diagram of the arc-shaped core-pulling rod being pulled out of the arc-shaped groove in the internal unhooking mechanism of the injection mold slider of the present invention; Figure 3 This is a schematic diagram of the outward core-pulling state of the side core-pulling slider of the internal unblocking mechanism of the injection mold slider of the present invention; Figure 4 This is a schematic diagram of the mold opening state structure of the internal unhooking mechanism of the injection mold slider of the present invention; Figure 5 This is a schematic diagram of the ejection and demolding state of the plastic part in the internal unblocking mechanism of the injection mold slider of the present invention; Figure 6 This is a schematic diagram of the side-pulling slider structure.
[0009] 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. Side core-pulling slider; 9. Hydraulic cylinder; 10. Plastic part; 11. Flanged edge; 12. Side panel; 13. Arc groove; 14. Mounting groove; 15. Inner sliding groove; 16. Delayed sliding groove; 17. Arc core-pulling rod; 18. Rotating rod; 19. Rotating shaft; 20. Sliding hole; 21. Push-pull rod; 22. Pin; 23. Limiting baffle; 24. Limiting block; 25. Limiting groove; 26. Upper ejector plate; 27. Lower ejector plate; 28. Ejector pin. Detailed Implementation
[0010] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention 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 the present invention. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual size of the product. 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 the present invention.
[0011] It should be noted that 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 "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 construction; 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 invention according to the specific circumstances.
[0012] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "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 the invention 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 the invention. The terms "first" and "second" are also used only for the sake of brevity in description and do not indicate or imply relative importance.
[0013] To further illustrate the content, features, and effects of this invention, the invention will be described in detail below with reference to the accompanying drawings and examples, but this should not be construed as limiting the invention.
[0014] This invention relates to an internal unhooking mechanism for a slider in an injection mold, such as... Figure 1 — Figure 6As 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. Mold feet 5 are provided on the lower platen 2. An ejector assembly 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 assembly. A movable template 7 is provided on the mold feet 5. A side core-pulling slider 8 is provided on the movable template 7. The side core-pulling slider 8 is driven by a hydraulic cylinder 9. A mold cavity is formed between the fixed template 3, the movable template 7, and the side core-pulling slider 8. A plastic part 10 is injection molded in the mold cavity. The plastic part 10 has downward flanges 11 around its perimeter. A transverse side panel 12 is provided on the outer wall of the flange 11. An inwardly inclined arc groove 13 is provided under the side panel 12. The core slider 8 has an installation groove 14, an inner sliding groove 15, and a delay sliding groove 16. An arc-shaped core-pulling rod 17 is provided in the installation groove 14. The upper end of the arc-shaped core-pulling rod 17 passes through the side core-pulling slider 8 and cooperates with the arc-shaped groove 13. A rotating rod 18 is provided on the side wall of the arc-shaped core-pulling rod 17. The rotating rod 18 is rotatably connected to the installation groove 14 via a rotating shaft 19. A sliding hole 20 is provided at the lower part of the arc-shaped core-pulling rod 17. A push-pull rod 21 is provided in the inner sliding groove 15 and the delay sliding groove 16. One end of the push-pull rod 21 is connected to the sliding hole 20 via a pin 22. A protruding limiting baffle 23 is provided at the other end of the push-pull rod 21. The piston rod of the hydraulic cylinder 9 passes through the side core-pulling slider 8 and connects to the limiting baffle 23. The limiting baffle 23 cooperates with the delay sliding groove 16.
[0015] Furthermore, a protruding limiting block 24 is provided on the moving template 7, and a limiting groove 25 is provided under the side core-pulling slider 8. The limiting groove 25 and the limiting block 24 are engaged for limiting. With the limiting block 24 and the limiting groove 25, the limiting block 24 is accurately limited during mold closing and reset.
[0016] Furthermore, the ejection assembly includes an upper ejector plate 26 and a lower ejector plate 27. The ejector rod 6 of the injection molding machine passes through the perforation 4 and cooperates with the lower ejector plate 27. Ejector pins 28 are provided on the upper ejector plate 26 and the lower ejector plate 27, and the ejector pins 28 cooperate with the bottom of the plastic part 10.
[0017] This invention discloses an internal unhooking mechanism for a slider in an injection mold. After the plastic part 10 is injection molded, the hydraulic cylinder 9 drives the push-pull rod 21 to move to the right along the inner slide groove 15 via the piston rod. The left head of the push-pull rod 21 engages with the slide hole 20 via the pin 22, causing the arc-shaped core-pulling rod 17 to rotate downward around the rotating shaft 19, so that the upper end of the arc-shaped core-pulling rod 17 is pulled downward out of the arc-shaped groove 13 (e.g., Figure 2As shown), at this time, because the limiting baffle 23 on the right head of the push-pull rod 21 cooperates with the delay slide 16, the side core-pulling slider 8 does not remain stationary when the arc-shaped core-pulling rod 17 is performing the core-pulling action, thus avoiding interference with the core-pulling action of the arc-shaped core-pulling rod 17. When the limiting baffle 23 moves to contact the right inner wall of the delay slide 16, the arc-shaped core-pulling rod 17 is also completely pulled out of the arc-shaped groove 13. At this time, the piston rod of the hydraulic cylinder 9 continues to drive the push-pull rod 21 and the limiting baffle 23 to move to the right. The limiting baffle 23 drives the side core-pulling slider 8 to move to the right and disengage from the side wall of the flange 11 of the plastic part 10 and the lower part of the side panel 12 (as shown). Figure 3 (As shown), then the injection molding machine drives the lower cover plate 2, mold feet 5, ejector assembly, moving mold plate 7, side core-pulling slider 8, hydraulic cylinder 9, and plastic part 10 to move downwards together, while the upper cover plate 1 and fixed mold plate 3 remain stationary, so that the mold gradually opens from the fixed mold plate 3 and moving mold plate 7 (as shown). Figure 4 As shown in the figure, the ejector pin 6 of the injection molding machine passes through the through hole 4 and pushes the lower ejector plate 27, the upper ejector plate 26 and the ejector pin 28 to move upward. The ejector pin 28 pushes the plastic part 10, which has completed the core pulling, upward to demold it.
[0018] 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 of the present invention. However, the scope of patent protection of the present invention shall still be determined by the scope defined in the appended claims.
Claims
1. An internal unhooking mechanism for an injection mold slider, 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 ejector assembly 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 ejector assembly, a movable template (7) is provided on the mold foot (5), a side core-pulling slider (8) is provided on the movable template (7), the side core-pulling slider (8) is driven by a hydraulic cylinder (9), a mold cavity is formed between the fixed template (3), the movable template (7), and the side core-pulling slider (8), and a plastic part (10) is injection molded in the mold cavity, wherein a downward flange (11) is provided around the plastic part (10), a transverse side panel (12) is provided on the outer wall of the flange (11), and an inwardly inclined arc groove (13) is provided under the side panel (12), characterized in that: The side core-pulling slider (8) has an installation groove (14), an inner sliding groove (15), and a delay sliding groove (16). An arc-shaped core-pulling rod (17) is provided in the installation groove (14). The upper end of the arc-shaped core-pulling rod (17) passes through the side core-pulling slider (8) and cooperates with the arc-shaped groove (13). A rotating rod (18) is provided on the side wall of the arc-shaped core-pulling rod (17). The rotating rod (18) is rotatably connected to the installation groove (14) via a rotating shaft (19). (17) has a sliding hole (20) at the bottom. A push-pull rod (21) is provided in the inner sliding groove (15) and the delay sliding groove (16). One end of the push-pull rod (21) is connected to the sliding hole (20) by a pin (22). The other end of the push-pull rod (21) is provided with a protruding limiting baffle (23). The piston rod of the oil cylinder (9) passes through the side core-pulling slider (8) and connects to the limiting baffle (23). The limiting baffle (23) is connected to the delay sliding groove (16).
2. The internal unhooking mechanism of the injection mold slider as described in claim 1, characterized in that: The moving template (7) is provided with a protruding limiting block (24), and a limiting groove (25) is provided under the side core-pulling slider (8). The limiting groove (25) and the limiting block (24) are in a limiting cooperation.
3. The internal unhooking mechanism of the injection mold slider as described in claim 1, characterized in that: The ejector assembly includes an upper ejector plate (26) and a lower ejector plate (27). The ejector rod (6) of the injection molding machine passes through the perforation (4) and cooperates with the lower ejector plate (27). Ejector pins (28) are provided on the upper ejector plate (26) and the lower ejector plate (27). The ejector pins (28) cooperate with the bottom of the plastic part (10).