Injection mold slider internal inclined ejection and knock-out mechanism
Patent Information
- Application Number
- CN202522190193.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-16
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-10-16
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，且翻边外壁设置凸出且倾斜向下的倒扣结构，导致侧抽芯滑块无法直接向外侧移动抽出该倒扣
[0013]本实用新型注塑模具滑块内部斜顶脱倒扣机构的有益效果是：在模具逐渐开模时，利用斜导杆与斜导孔配合，带动侧抽芯滑块向外侧抽芯，同时，侧抽芯滑块上部凸块与内斜顶之间的第一弹簧在弹力作用下，推动内斜顶能沿着斜滑面向下滑动，使内斜顶能够顺利脱出倒扣，最后在限位销钉的作用下带动脱出倒扣的内斜顶一起向外侧移动，从而在保证倒扣倾斜角度以及尺寸的前提下，使塑料件的倒扣能够顺利脱模，无需采用强脱的方式，保证产品的成品率高。
Smart Images
Figure CN224897941U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to injection molds, and in particular to an internal inclined ejector buckling mechanism for the slider of 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, and the outer wall of the flange has a protruding and downward-sloping undercut structure, the side core-pulling slider cannot move directly outward to remove the undercut. The traditional method is to reduce the undercut's angle and size, utilizing the elastic deformation ability of the plastic material to force the side core-pulling slider out of the undercut through a forced release method. The disadvantages of this structure are: firstly, using a forced release method, the undercut is easily broken or the entire sidewall of the plastic part is deformed when the side core-pulling slider removes it, thus affecting the product yield; secondly, reducing the undercut's angle or size affects its fastening ability and makes it difficult to assemble the undercut with other structures. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an injection mold slider internal inclined ejector mechanism that allows plastic parts to be easily demolded and has a high yield rate, while ensuring the undercut tilt angle and size.
[0004] The technical solution of the internal inclined ejector and undercut mechanism of the injection mold slider of this utility model is as follows: It includes an upper plate and a lower plate. A fixed template is set under the upper plate, and an inclined guide rod is set in the fixed template. A through hole is opened in the lower plate, and mold feet are set on the lower plate. An ejector assembly is set 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 set on the mold feet, and a side core-pulling slider is set on the upper part of one side of the movable template. An inclined guide hole is opened in the side core-pulling slider, and the lower end of the inclined guide rod passes through the fixed template. The template and the inclined guide hole cooperate to form a mold cavity between the fixed template, the moving template and the side core-pulling slider. The mold cavity contains an injection-molded plastic part. One side of the plastic part is provided with a downward flange, and the outer wall of the flange is provided with an inclined downward undercut. The side core-pulling slider is provided with an inclined sliding surface and a protrusion. An inner inclined top is provided on the inclined sliding surface. The bottom surface of the inner inclined top is in sliding cooperation with the inclined sliding surface. One side of the inner inclined top is in cooperation with the undercut of the plastic part. A pushing and limiting component for pushing the inner inclined top is provided between the other side of the inner inclined top and the protrusion.
[0005] Furthermore, the push-limiting component includes an elastic element disposed between the protrusion and the inner inclined top, a limiting pin disposed in the protrusion, one end of the limiting pin passing through the protrusion and fixed to the inner inclined top, and a limiting convex ring disposed at the other end of the limiting pin, the limiting convex ring engaging with the side of the protrusion away from the inner inclined top for limiting engagement.
[0006] Furthermore, the elastic element is a first spring, which is sleeved on the outer wall of the limiting pin. One side of the first spring is in contact with the side wall of the protrusion, and the other side of the first spring is in contact with the side wall of the inner inclined top.
[0007] Furthermore, spring grooves are respectively formed on one side of the protrusion and the inner inclined top, and the first spring is disposed in the spring groove.
[0008] Furthermore, a protruding limiting block is provided on the upper part of the inner inclined top, and an anti-cavity groove is opened on the lower part of the fixed template. A stop block is provided on one side of the anti-cavity groove, and the limiting block and the stop block cooperate with each other.
[0009] Furthermore, an installation groove is provided in the moving template, and a positioning pin, a second spring and a plug are provided in the installation groove. One end of the second spring contacts the positioning pin and the other end of the second spring contacts the plug. A first positioning groove and a second positioning groove are provided at the bottom of the side core-pulling slider. The upper end of the positioning pin passes through the moving template and cooperates with the first positioning groove or the second positioning groove.
[0010] Furthermore, the ejection assembly includes an upper ejector plate and a lower ejector plate on the lower cover plate, the upper ejector plate and the lower ejector plate are fixed together by fasteners, and ejector pins are provided on the upper ejector plate and the lower ejector plate, the ejector pins passing through the moving template and cooperating with the plastic part.
[0011] Furthermore, a guide post is provided between the lower cover plate and the moving template, and straight guide holes are opened in the upper ejector plate and the lower ejector plate, with the guide post cooperating with the straight guide hole.
[0012] Furthermore, guide sleeves are provided in the straight guide holes of the upper ejector plate and the lower ejector plate, and the guide sleeves cooperate with the guide posts.
[0013] The beneficial effects of this utility model's internal inclined ejector unhooking mechanism for injection mold sliders are as follows: As the mold gradually opens, the inclined guide rod and inclined guide hole work together to drive the side core-pulling slider to pull the core outward. At the same time, the first spring between the upper protrusion of the side core-pulling slider and the inner inclined ejector, under the action of elastic force, pushes the inner inclined ejector to slide downward along the inclined sliding surface, allowing the inner inclined ejector to smoothly disengage from the undercut. Finally, under the action of the limiting pin, the inner inclined ejector that has disengaged from the undercut moves outward together. Thus, while ensuring the undercut tilt angle and size, the undercut of the plastic part can be smoothly demolded without the need for a forced demolding method, ensuring a high product yield. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the mold closing state structure of the inclined ejector and undercut mechanism inside the slider of the injection mold of this utility model; Figure 2 This is a schematic diagram of a structure in which the side core-pulling slider pulls the core outward and the inner inclined top moves downward to disengage from the inverted state. Figure 3 This is a schematic diagram of the mold opening state structure of the inclined ejector and buckling mechanism inside the slider of the injection mold of this utility model; Figure 4 This is a schematic diagram of the plastic part ejection state of the internal inclined ejector buckling mechanism of the injection mold slider of this utility model; Figure 5 yes Figure 4 A magnified view of part A.
[0015] In the diagram, 1. Upper cover plate; 2. Lower cover plate; 3. Fixed template; 4. Angled guide rod; 5. Through hole; 6. Mold foot; 7. Ejector rod; 8. Moving template; 9. Side core-pulling slider; 10. Angled guide hole; 11. Plastic part; 12. Flanged edge; 13. Undercut; 14. Angled sliding surface; 15. Protrusion; 16. Inner angled ejector; 17. Limiting pin; 18. Limiting protrusion ring; 19. First spring; 20. Spring groove; 21. Limiting block; 22. Clearance groove; 23. Stop block; 24. Mounting groove; 25. Positioning pin; 26. Second spring; 27. Plug; 28. First positioning groove; 29. Second positioning groove; 30. Upper ejector plate; 31. Lower ejector plate; 32. Ejector pin; 33. Guide post; 34. Straight guide hole; 35. Guide sleeve. Detailed Implementation
[0016] 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.
[0017] 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.
[0018] 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.
[0019] 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.
[0020] This utility model relates to an internal inclined ejector buckling mechanism for an injection mold slider, 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 installed under the upper platen 1, and a slanted guide rod 4 is installed within the fixed template 3. A through hole 5 is formed in the lower platen 2, and mold feet 6 are installed on the lower platen 2. An ejector assembly is installed on the lower platen 2 between the mold feet 6. The ejector rod 7 of the injection molding machine passes through the through hole 5 and engages with the ejector assembly. A movable template 8 is installed on the mold feet 6, and a side core-pulling slider 9 is installed on the upper part of one side of the movable template 8. A slanted guide hole 10 is formed in the side core-pulling slider 9, and the lower end of the slanted guide rod 4 passes through the fixed template 3 and engages with the slanted guide hole 10. The fixed template 3, movable template 8, and lower platen 2 are connected in a series of steps. A mold cavity is formed between the template 8 and the side core-pulling slider 9. A plastic part 11 is injection-molded in the mold cavity. A downward flange 12 is provided on one side of the plastic part 11. An inclined undercut 13 is provided on the outer wall of the flange 12. An inclined sliding surface 14 and a protrusion 15 are provided on the side core-pulling slider 9. An inner inclined top 16 is provided on the inclined sliding surface 14. The bottom surface of the inner inclined top 16 is slidably engaged with the inclined sliding surface 14. One side of the inner inclined top 16 is engaged with the undercut 13 of the plastic part 11. A pushing and limiting component for pushing the inner inclined top 16 is provided between the other side of the inner inclined top 16 and the protrusion 15.
[0021] Furthermore, the push-limiting assembly includes an elastic element disposed between the protrusion 15 and the inner inclined top 16. A limiting pin 17 is disposed in the protrusion 15, with one end of the limiting pin 17 passing through the protrusion 15 and fixed to the inner inclined top 16. A limiting protruding ring 18 is disposed at the other end of the limiting pin 17, and the limiting protruding ring 18 is engaged with the side of the protrusion 15 away from the inner inclined top 16. When the side core-pulling slider 9 moves the protrusion 15 outward, the elastic element pushes the bottom surface of the inner inclined top 16 downward along the inclined sliding surface 14 under the action of elastic force until one side of the inner inclined top 16 disengages downward from the undercut 13 of the plastic part 11. After the undercut 13 is disengaged, the limiting protruding ring 18 of the limiting pin 17 also makes limiting contact with the protrusion 15. At this time, the side core-pulling slider 9 drives the inner inclined top 16 to move outward together through the limiting pin 17 and disengage from the plastic part 11.
[0022] Furthermore, the elastic element is a first spring 19, which is sleeved on the outer wall of the limiting pin 17. One side of the first spring 19 contacts the side wall of the protrusion 15, and the other side of the first spring 19 contacts the side wall of the inner inclined top 16. The elastic element, with the first spring 19 sleeved on the outer wall of the limiting pin 17, allows the limiting pin 17 to guide and limit the first spring 19, preventing it from twisting during elastic expansion or compression.
[0023] Furthermore, spring grooves 20 are respectively formed on one side of the protrusion 15 and the inner inclined top 16, and the first spring 19 is disposed in the spring groove 20. The spring groove 20 can limit the outer wall of the first spring 19 and prevent the first spring 19 from twisting when it is elastically unfolded or compressed.
[0024] Furthermore, a protruding limiting block 21 is provided on the upper part of the inner inclined top 16, and an clearance groove 22 is provided on the lower part of the fixed template 3. A stop block 23 is provided on one side of the clearance groove 22, and the limiting block 21 cooperates with the stop block 23. When the mold is closed, before the mold cavity is filled with glue, the stop block 23 cooperates with the limiting block 21 to limit the inner inclined top 16 and prevent it from sliding to one side of the mold cavity under the elastic force of the first spring 19.
[0025] Furthermore, the moving template 8 has an installation groove 24, in which a positioning pin 25, a second spring 26, and a plug 27 are provided. One end of the second spring 26 contacts the positioning pin 25, and the other end of the second spring 26 contacts the plug 27. The bottom of the side core-pulling slider 9 has a first positioning groove 28 and a second positioning groove 29. The upper end of the positioning pin 25 passes through the moving template 8 and cooperates with the first positioning groove 28 or the second positioning groove 29. The top of the locating pin 25 is arc-shaped, and the corresponding first locating groove 28 and second locating groove 29 are also arc-shaped. When the mold is closed, the locating pin 25 and the second locating groove 29 are positioned and engaged. When the mold gradually opens, the side core-pulling slider 9 moves outward, and its bottom presses against the locating pin 25, causing the locating pin 25 to move downward against the elastic force of the second spring 26. When the side core-pulling slider 9 moves outward into position, its bottom first locating groove 28 corresponds to the locating pin 25. Under the action of the elastic force of the second spring 26, the locating pin 25 is pushed upward and inserted into the first locating groove 28. With the locating pin 25, the first locating groove 28, and the second locating groove 29, the side core-pulling slider 9 can be positioned to move outward or inward, preventing it from moving too far. Especially after the inclined guide rod 4 is pulled out of the inclined guide hole 10, if the side core-pulling slider 9 moves too far outward, the inclined guide rod 4 will not be able to be reinserted into the inclined guide hole 10 when the mold is closed.
[0026] Furthermore, the ejection assembly includes an upper ejector plate 30 and a lower ejector plate 31 disposed on the lower cover plate 2. The upper ejector plate 30 and the lower ejector plate 31 are fixed together by fasteners. Ejector pins 32 are disposed on the upper ejector plate 30 and the lower ejector plate 31. The ejector pins 32 pass through the moving template 8 and cooperate with the plastic part 11.
[0027] Furthermore, a guide post 33 is provided between the lower cover plate 2 and the moving template 8, and a straight guide hole 34 is provided in the upper ejector plate 30 and the lower ejector plate 31. The guide post 33 cooperates with the straight guide hole 34. With the straight guide hole 34 and the guide post 33, the up and down movement of the upper and lower ejector plates 30 and 31 can be guided, making their movement more precise.
[0028] Furthermore, guide sleeves 35 are provided in the straight guide holes 34 of the upper ejector plate 30 and the lower ejector plate 31, and the guide sleeves 35 cooperate with the guide posts 33. The guide sleeves 35 increase their wear resistance and ensure their service life.
[0029] This utility model discloses an internal inclined ejector unhooking mechanism for an injection mold slider. After the plastic part 11 in the mold cavity is injection molded, the injection molding machine drives the lower platen 2 to move downward. The lower platen 2 drives the mold feet 6, ejector assembly, moving platen 8, side core-pulling slider 9, plastic part 11, and inner inclined ejector 16 to move downward together, while the upper platen 1, fixed platen 3, and inclined guide rod 4 remain stationary, allowing the mold to gradually open from the fixed platen 3 and moving platen 8. At the same time, the side core-pulling slider 9, under the action of the inclined guide hole 10 and the inclined guide rod 4, drives the side core-pulling slider 9 to gradually move outward. The first spring 19, under the action of elastic force, pushes the inner inclined ejector 16, preventing the inner inclined ejector 16 from moving outward with the side core-pulling slider 9. The side wall of the inner inclined ejector 16 can remain attached to the outer wall of the flange 12 of the plastic part 11, while the inner inclined ejector 16... The bottom of 6 gradually slides down along the inclined surface 14 (the inclined surface 14 is low on the side close to the plastic part 11 and gradually rises on the side away from the plastic part 11, and is in an inclined state, and the bottom surface of the inner inclined top 15 is also in a corresponding inclined state), so that the inner inclined top 16 gradually moves down and disengages from the undercut 13. When the inner inclined top 16 is completely disengaged from the undercut 13, the inner inclined top 16 drives the limiting ring 18 of the limiting pin 17 to make contact with the limiting block 15. At this time, the side core-pulling slider 9 drives the inner inclined top 16 to move down together through the limiting pin 17, so that the flange 12 of the plastic part 11 is disengaged. Finally, the ejector rod 7 of the injection molding machine drives the upper ejector plate 30 and the lower ejector plate 31 of the ejection assembly to move upward. The upper and lower ejector plates 30 and 31 drive the ejector pin 32 to push the plastic part 11 upward and demold it.
[0030] 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. An internal inclined ejector and undercut 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), an inclined guide rod (4) is provided in the fixed template (3), a through hole (5) is provided in the lower platen (2), mold feet (6) are provided on the lower platen (2), and an ejector assembly is provided on the lower platen (2) between the mold feet (6), an ejector rod (7) of the injection molding machine passes through the through hole (5) and cooperates with the ejector assembly, a moving template (8) is provided on the mold feet (6), and a moving template (8) is provided on the moving template. A side core-pulling slider (9) is provided on the upper part of one side of the plate (8). An oblique guide hole (10) is opened in the side core-pulling slider (9). The lower end of the oblique guide rod (4) passes through the fixed template (3) and cooperates with the oblique guide hole (10). A mold cavity is formed between the fixed template (3), the moving template (8), and the side core-pulling slider (9). A plastic part (11) is injection molded in the mold cavity. A downward flange (12) is provided on one side of the plastic part (11). An inclined downward undercut (13) is provided on the outer wall of the flange (12). The feature is: The side core-pulling slider (9) is provided with a sloping surface (14) and a protrusion (15). An inner sloping top (16) is provided on the sloping surface (14). The bottom surface of the inner sloping top (16) is slidably engaged with the sloping surface (14). One side of the inner sloping top (16) is engaged with the undercut (13) of the plastic part (11). A push-limiting component for pushing the inner sloping top (16) is provided between the other side of the inner sloping top (16) and the protrusion (15).
2. The internal inclined ejector buckling mechanism of the injection mold slider as described in claim 1, characterized in that: The push-limiting component includes an elastic element between the protrusion (15) and the inner inclined top (16), a limiting pin (17) is provided in the protrusion (15), one end of the limiting pin (17) passes through the protrusion (15) and is fixed to the inner inclined top (16), and a limiting protrusion ring (18) is provided at the other end of the limiting pin (17), and the limiting protrusion ring (18) is limited and engaged with the side of the protrusion (15) away from the inner inclined top (16).
3. The internal inclined ejector buckling mechanism of the injection mold slider as described in claim 2, characterized in that: The elastic element is a first spring (19), which is sleeved on the outer wall of the limiting pin (17). One side of the first spring (19) is in contact with the side wall of the protrusion (15), and the other side of the first spring (19) is in contact with the side wall of the inner inclined top (16).
4. The internal inclined ejector buckling mechanism of the injection mold slider as described in claim 3, characterized in that: Spring grooves (20) are respectively opened on one side of the protrusion (15) and the inner inclined top (16), and the first spring (19) is disposed in the spring groove (20).
5. The internal inclined ejector buckling mechanism of the injection mold slider as described in claim 1, characterized in that: The inner inclined top (16) is provided with a protruding limiting block (21) on the upper part, and the fixed template (3) is provided with a clearance groove (22) on the lower part. A stop block (23) is provided on one side of the clearance groove (22), and the limiting block (21) and the stop block (23) cooperate with each other.
6. The internal inclined ejector and buckle release mechanism of the injection mold slider as described in claim 1, characterized in that: The moving template (8) has an installation groove (24) in which a positioning pin (25), a second spring (26) and a plug (27) are provided. One end of the second spring (26) is in contact with the positioning pin (25), and the other end of the second spring (26) is in contact with the plug (27). The bottom of the side core-pulling slider (9) has a first positioning groove (28) and a second positioning groove (29). The upper end of the positioning pin (25) passes through the moving template (8) and cooperates with the first positioning groove (28) or the second positioning groove (29).
7. The internal inclined ejector buckling mechanism of the injection mold slider as described in claim 1, characterized in that: The ejection assembly includes an upper ejector plate (30) and a lower ejector plate (31) on the lower cover plate (2). The upper ejector plate (30) and the lower ejector plate (31) are fixed together by fasteners. Ejector pins (32) are provided on the upper ejector plate (30) and the lower ejector plate (31). The ejector pins (32) pass through the moving template (8) and cooperate with the plastic part (11).
8. The internal inclined ejector buckling mechanism of the injection mold slider as described in claim 7, characterized in that: A guide post (33) is provided between the lower cover plate (2) and the moving template (8), and a straight guide hole (34) is opened in the upper ejector plate (30) and the lower ejector plate (31), with the guide post (33) cooperating with the straight guide hole (34).
9. The internal inclined ejector buckling mechanism of the injection mold slider as described in claim 8, characterized in that: Guide sleeves (35) are provided in the straight guide holes (34) of the upper ejector plate (30) and the lower ejector plate (31), and the guide sleeves (35) cooperate with the guide post (33).