Wedge and spring combined type inner side core-pulling mechanism of injection mold
The inclined wedge spring combined inner core pulling mechanism solves the problem of difficult demoulding of traditional injection molds under the rib and inner groove structure, and realizes the smooth extraction and demoulding of plastic parts.
Patent Information
- Application Number
- CN202421852333.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-01
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-08-01
AI Technical Summary
When traditional injection molds have ribs on the bottom of plastic parts, they cannot be demoulded smoothly, especially when there are inner grooves on the inner wall of the flange, the interference of the inclined ejector leads to demoulding failure.
The inner core pulling mechanism with a combined inclined wedge and spring is adopted. By setting a slide groove and an inner core pulling slider on the movable template, combined with the cooperation of the inclined wedge and the limit lock hole, the spring is used to push the inner core pulling slider out of the inner groove smoothly, combined with the cooperation of the inclined wedge and the limit lock hole to ensure smooth demoulding.
The smooth demoulding of the plastic parts is achieved, the structure is simple, the interference of ribs is avoided, and the normal operation of the mold is ensured.
Smart Images
Figure CN223383888U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an injection mold, in particular to an inclined wedge spring combined inner core pulling mechanism of the injection mold. Background Art
[0002] When using an injection mold to produce plastic parts, if the plastic part is formed with downward flanges on all sides and an inner groove is formed on the inner wall of the flange, the traditional method is usually to set a slanted ejector structure on the upper and lower ejector plates. The slanted ejector rod in the slanted ejector structure passes through the movable template and cooperates with the inner groove of the plastic part. After the plastic part is injection molded, the upper and lower ejector plates are used to drive the slanted ejector structure to move upward. While the slanted ejector rod of the slanted ejector structure pushes the plastic part upward and demolds it, the upper end of the slanted ejector rod gradually moves inward to pull out the inner groove. However, if there are ribs on the lower part of the plastic part, the ribs will interfere with the action of the slanted ejector rod pushing up and pulling the core inward, resulting in failure to demold. Summary of the Invention
[0003] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide an injection mold inclined wedge spring combined inner core pulling mechanism with a simple structure to ensure smooth demoulding of plastic parts.
[0004] The technical solution of the combined inner core-pulling mechanism of the inclined wedge spring of the injection mold of the utility model is as follows: it comprises an upper double plate and a lower double plate, a fixed template is arranged under the upper double plate, a through hole is opened in the lower double plate, a mold foot is arranged on the lower double plate, an upper ejector plate, a lower ejector plate and an ejector are arranged on the lower double plate between the mold feet, the ejector rod of the injection machine passes through the through hole and cooperates with the lower ejector plate, a movable template is arranged on the mold foot, a mold cavity is formed between the movable template and the fixed template, an injection-molded plastic part is arranged in the mold cavity, a convex rib is formed on the lower part of the plastic part, and the plastic part is provided with a convex rib. The material part is provided with downward flanges on all sides, and an inner groove is provided on the inner wall of the flange. A rib groove is provided on the upper end of the movable template, and the rib groove cooperates with the rib of the plastic part. A slide groove is provided on the upper part of one side of the movable template, and an inner core-pulling slider is provided in the slide groove. A protrusion is provided on the inner core-pulling slider, and the protrusion cooperates with the inner groove of the plastic part. An upper limit lock hole is provided in the inner core-pulling slider, and an inclined wedge is provided under the fixed template, and the inclined wedge cooperates with the upper limit lock hole. A pushing structure is provided on the side wall of the movable template, and the pushing structure cooperates with the side wall of the inner core-pulling slider.
[0005] Furthermore, the pushing structure includes a fixed seat provided on the side wall of the movable template, a spring provided in the fixed seat, one end of the spring contacts the fixed seat, and the other end of the spring contacts the inner core-pulling slider.
[0006] Furthermore, a lower limit lock hole is provided in the movable template, and when the mold is closed, the lower limit lock hole corresponds to the upper limit lock hole.
[0007] Furthermore, a lower inclined guide surface is formed on the side of the upper limit lock hole and the lower limit lock hole close to the pushing structure, and an upper inclined guide surface is formed on the side corresponding to the inclined wedge and the lower inclined guide surface, and the upper inclined guide surface cooperates with the lower inclined guide surface.
[0008] The beneficial effect of the inclined wedge spring combined inner core pulling mechanism of the injection mold of the utility model is: by opening a slide groove on one side of the movable template, an inner core pulling slider is set in the slide groove, and the inclined wedge on the fixed template is matched with the upper limit lock hole in the inner core pulling slider, combined with the pushing effect of the spring, so that when the mold is opened, the inner core pulling slider can be smoothly pulled out of the plastic part. The structure is simple and ensures that the plastic part can be demoulded smoothly. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 This is a schematic structural diagram of the mold closing state of the utility model's inclined wedge spring combined inner core pulling mechanism for the injection mold;
[0010] Figure 2 This is a schematic structural diagram of the mold opening state of the inclined wedge spring combined inner core pulling mechanism of the injection mold of the utility model;
[0011] Figure 3 The utility model is a structural schematic diagram of the plastic part ejection state of the inclined wedge spring combined inner core pulling mechanism of the injection mold. DETAILED DESCRIPTION
[0012] The utility model relates to an injection mold inclined wedge spring combined inner core pulling mechanism, such as Figure 1 — Figure 3 As shown, it includes an upper composite plate 1 and a lower composite plate 2, a fixed template 3 is set under the upper composite plate 1, a perforation 4 is opened in the lower composite plate 2, a mold foot 5 is set on the lower composite plate 2, an upper ejector plate 6, a lower ejector plate 7 and an ejector 8 are set on the lower composite plate 2 between the mold feet 5, and an ejector rod 9 of the injection machine passes through the perforation 4 and cooperates with the lower ejector plate 7, a movable template 10 is set on the mold foot 5, and a mold cavity is formed between the movable template 10 and the fixed template 3, and an injection-molded plastic part 11 is in the mold cavity, and a convex rib 12 is formed on the lower part of the plastic part 11, and a downward flange 13 is formed around the plastic part 11, and the inner wall of the flange 13 is formed. Inner groove 14, a rib groove 15 is provided at the upper end of the movable template 10, and the rib groove 15 cooperates with the rib 12 of the plastic part 11. A slide groove 16 is provided on the upper part of one side of the movable template 10, and an inner core-pulling slider 17 is provided in the slide groove 16. A protrusion 18 is formed on the inner core-pulling slider 17, and the protrusion 18 cooperates with the inner groove 14 of the plastic part 11. An upper limit lock hole 19 is provided in the inner core-pulling slider 17, and an inclined wedge 20 is provided under the fixed template 3, and the inclined wedge 20 cooperates with the upper limit lock hole 19. A pushing structure is provided on the side wall of the movable template 10, and the pushing structure cooperates with the side wall of the inner core-pulling slider 17.
[0013] Furthermore, the pushing structure includes a fixing seat 21 provided on the side wall of the movable template 10 , a spring 22 provided in the fixing seat 21 , one end of the spring 22 contacts the fixing seat 21 , and the other end of the spring 22 contacts the inner core-pulling slider 17 .
[0014] Furthermore, the movable platen 10 is provided with a lower limit lock hole 23. When the mold is closed, the lower limit lock hole 23 corresponds to the upper limit lock hole 19. When the mold is closed, the bevel 20 is inserted into both the upper limit lock hole 19 and the lower limit lock hole 23. The lower limit lock hole 23 locks the lower end of the bevel 20 in place. The bevel 20 also locks the inner core-pulling slider 17 in place. This prevents excessive injection pressure during injection molding, which could cause the inner core-pulling slider 17 to move inward and cause the bevel 20 to deviate, thereby affecting the molding quality of the plastic part 11.
[0015] Furthermore, a lower inclined guide surface 24 is formed on the side of the upper limit lock hole 19 and the lower limit lock hole 23 close to the pushing structure, and an upper inclined guide surface 25 is formed on the side of the inclined wedge 20 corresponding to the lower inclined guide surface 24, and the upper inclined guide surface 25 cooperates with the lower inclined guide surface 24. When the mold is closed, since the inner core-pulling slider 17 is in the inward core-pulling state, the inclined wedge 20 is staggered with the upper limit lock hole 19, and the upper limit lock hole 19 is staggered with the lower limit lock hole 23. When the inclined wedge 20 is closed, the cooperation between the upper inclined guide surface 25 and the lower inclined guide surface 24 pushes the inner core-pulling slider 17 to overcome the elastic force of the spring 22 and slide to the left along the upper and lower inclined guide surfaces, so that the inner core-pulling slider 17 can be smoothly reset.
[0016] The utility model discloses an inner core pulling mechanism of an injection mold with an inclined wedge spring combination. When a plastic part 11 is injection molded, the lower double plate 2 drives the mold foot 5, the upper ejector plate 6, the lower ejector plate 7, the ejector 8, the movable plate 10, the plastic part 11, the inner core pulling slider 17, the fixed seat 21, and the spring 22 (i.e., all the components on the movable mold side) to move downward together, while the upper double plate 1, the fixed mold plate 3 and the inclined wedge 20 (i.e., all the components on the fixed mold side) remain stationary, so that the mold is opened from the fixed mold plate 3 and the movable mold plate 10, and the inner core pulling slider 17 is moved downward. While moving downward, the inclined wedge 20 gradually disengages from the upper limit lock hole 19 of the inner core-pulling slider 17, and the inclined wedge 20 disengages from the limiting cooperation with the inner core-pulling slider 17. Under the action of the elastic force of the spring 22, the inner core-pulling slider 17 is pushed to gradually move inward along the slide groove 16. The inner core-pulling slider 17 drives the protrusion 18 to be pulled inward out of the inner groove 14 of the plastic part 11. Finally, the ejector rod 9 of the injection machine passes through the through hole 4 to push the upper and lower ejector plates 6, 7 and the ejector pin 8 to move upward, and the ejector pin 8 ejects the plastic part 11 with the inner core pulled upward and demolds it. The present invention provides an inner core pulling mechanism of an injection mold with an inclined wedge and spring combination. A slide groove 16 is provided on one side of the movable mold plate 10. An inner core pulling slider 17 is provided in the slide groove 16. The inclined wedge 20 on the fixed mold plate 3 cooperates with the upper limit lock hole 19 in the inner core pulling slider 17. Combined with the pushing action of the spring 22, when the mold is opened, the inner core pulling slider 17 can smoothly pull out the inner pull 14 of the plastic part 1. The structure is simple and ensures that the plastic part 11 can be smoothly demolded.
Claims
1. An injection mold inclined wedge spring combined inner core pulling mechanism, comprising an upper plate (1) and a lower plate (2), a fixed plate (3) being provided under the upper plate (1), a through hole (4) being provided in the lower plate (2), a mold foot (5) being provided on the lower plate (2), an upper ejector plate (6), a lower ejector plate (7) and an ejector pin (8) being provided on the lower plate (2) between the mold feet (5), a ejector pin (9) of an injection molding machine passing through the through hole (4) and cooperating with the lower ejector plate (7), a movable plate (10) being provided on the mold foot (5), a mold cavity being formed between the movable plate (10) and the fixed plate (3), a plastic part (11) being injection molded in the mold cavity, a convex rib (12) being provided on the lower portion of the plastic part (11), a downward flange (13) being provided around the periphery of the plastic part (11), an inner groove (14) being provided on the inner wall of the flange (13), characterized in that: A rib groove (15) is provided at the upper end of the movable template (10), and the rib groove (15) cooperates with the rib (12) of the plastic part (11). A slide groove (16) is provided on the upper part of one side of the movable template (10), and an inner core-pulling slider (17) is provided in the slide groove (16). A convex block (18) is formed on the inner core-pulling slider (17), and the convex block (18) cooperates with the inner groove (14) of the plastic part (11). An upper limit locking hole (19) is provided in the inner core-pulling slider (17), and an inclined wedge (20) is provided under the fixed template (3), and the inclined wedge (20) cooperates with the upper limit locking hole (19). A pushing structure is provided on the side wall of the movable template (10), and the pushing structure cooperates with the side wall of the inner core-pulling slider (17).
2. The injection mold inclined wedge spring combined inner core pulling mechanism according to claim 1, characterized in that: The pushing structure includes a fixed seat (21) provided on the side wall of the movable template (10), a spring (22) provided in the fixed seat (21), one end of the spring (22) contacts the fixed seat (21), and the other end of the spring (22) contacts the inner core-pulling slider (17).
3. The injection mold inclined wedge spring combined inner core pulling mechanism according to claim 1, characterized in that: The movable plate (10) is provided with a lower limit lock hole (23), and when the mold is closed, the lower limit lock hole (23) corresponds to the upper limit lock hole (19).
4. The injection mold inclined wedge spring combined inner core pulling mechanism according to claim 3, characterized in that: A lower inclined guide surface (24) is formed on the side of the upper limit lock hole (19) and the lower limit lock hole (23) close to the pushing structure, and an upper inclined guide surface (25) is formed on the side of the inclined wedge (20) corresponding to the lower inclined guide surface (24), and the upper inclined guide surface (25) cooperates with the lower inclined guide surface (24).