High-speed ejector pin heightening mold stripping structure
The high-speed ejector pin structure with double-layer top plate and spring linkage solves the problems of low efficiency, high cost and safety hazards in injection mold demolding, and realizes a high-efficiency and safe ejection process, which can be adapted to the production of multiple product models.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-08
- Publication Date
- 2026-04-03
AI Technical Summary
Existing injection molds suffer from low demolding efficiency, high maintenance costs, and safety hazards during demolding. This is especially true for plastic parts with deep ribs, where the ejection action must be strictly synchronized with the angled ejector, resulting in speed limitations. High-precision components are difficult to replace after wear, and there is also a risk of mold collision.
The high-speed ejector pin structure with double-layer top plate and spring linkage is adopted. Through the combination design of inclined ejector, first top plate, second top plate, ejector pin, spring block and spring, the ejector pin can be ejected and reset synchronously, reducing the precision requirements and manufacturing cost of the mold, and ensuring uniform ejection force and safety.
It improves demolding efficiency, reduces mold manufacturing and maintenance costs, reduces safety hazards, adapts to the production needs of multiple product models, and reduces mold modification costs.
Smart Images
Figure CN224074892U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection molds, and in particular to a high-speed ejector pin pad structure that protrudes from the mold. Background Technology
[0002] In the field of injection molding, plastic parts with deep ridges are prone to sticking to the ejector pins during demolding due to excessive clamping force, requiring ejector pins for assisted demolding. Existing technologies typically employ two solutions: relying on a single ejector plate to push the ejector pins, where the ejection stroke is limited by the range of motion of the angled ejector, necessitating the machining of complex guide grooves to ensure alignment between the ejector pins and the deep ridges, resulting in high mold precision requirements and increased manufacturing costs; or increasing the ejection force by extending the ejector pin length, but this easily leads to pin bending or breakage, and imposes stringent requirements on mold structure space.
[0003] The above solution has the following problems: low demolding efficiency: the ejection action needs to be strictly synchronized with the inclined ejector, which limits the speed; high maintenance cost: it is difficult to replace high-precision parts after they wear out, resulting in long downtime; safety hazards: if sticking to the mold is not detected in time, it can easily cause collision and damage to the mold. Utility Model Content
[0004] In view of the above situation, it is necessary to provide a high-speed ejector pad mold structure that solves at least one of the above problems, including an inclined ejector (1), a first ejector plate (2), a second ejector plate (3), an ejector pin (4), a spring block (5), and a spring (6);
[0005] One end of the inclined top (1) is provided with a fitting area (101), the fitting area (101) is provided with at least one first slot (102), and the spring block (5) is embedded in the first slot (102);
[0006] The first top plate (2) is attached to the fitting area (101) of the inclined top (1), and the second top plate (3) is attached to the first top plate (2);
[0007] The second top plate (3) is provided with multiple sets of second slots (301) for fixing the ejector pin (4), and the ejector pin (4) is snapped into the second slot (301);
[0008] The second top plate (3) is also provided with multiple sets of springs (6), which are evenly distributed in the gaps between each pin (4).
[0009] Preferably, the contact surface between the first slot (102) and the spring block (5) is an inclined surface, and the inclination direction of the inclined surface is consistent with the sliding direction of the inclined top (1).
[0010] Preferably, the axis of the ejector pin (4) is parallel to the direction of movement of the second top plate (3), and the front end of the ejector pin extends to the end of the deep bone position of the plastic part.
[0011] Preferably, the two ends of the spring (6) abut against the second top plate (3) and the fixed base of the mold, respectively.
[0012] Preferably, the second slot (301) of the second top plate (3) is a transverse through hole, and the ejector pin (4) is fixed in the second slot (301) by thread or snap fastener.
[0013] Preferably, the first top plate (2) and the second top plate (3) are slidably connected by a pin or guide post.
[0014] Preferably, the cross-sectional shape of the spring block (5) matches the first slot (102), and the spring block (5) is made of high wear-resistant alloy steel.
[0015] Preferably, the surface of the bonding area (101) of the inclined top (1) is provided with an anti-stick coating.
[0016] Preferably, the number of the pins (4) is 3-6 groups, and each group corresponds to the center line of a deep bone position. Attached Figure Description
[0017] Figure 1 This is a first-view structural schematic diagram of the high-speed ejector pad protruding from the mold structure according to an embodiment of the present invention.
[0018] Figure 2 This is a second-view structural schematic diagram of the high-speed ejector pad protruding from the mold according to an embodiment of the present invention.
[0019] Figure 3 This is an exploded view of the high-speed ejector pad structure of this utility model embodiment. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the high-speed ejector pin heightening mold structure of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.
[0021] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "center," "longitudinal," "lateral," "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0023] Please see Figures 1 to 3A high-speed ejector pin raised mold structure includes an inclined ejector (1), a first ejector plate (2), a second ejector plate (3), ejector pins (4), spring blocks (5), and springs (6); one end of the inclined ejector (1) is provided with a fitting area (101), the fitting area (101) is provided with at least one first slot (102), and the spring block (5) is embedded in the first slot (102); the first ejector plate (2) is fitted to the fitting area (101) of the inclined ejector (1), and the second ejector plate (3) is fitted to the first ejector plate (2); the second ejector plate (3) is provided with multiple sets of second slots (301) for fixing ejector pins (4), and ejector pins (4) are engaged in the second slots (301); the second ejector plate (3) is also provided with multiple sets of springs (6), and the springs (6) are evenly distributed in the gaps between each ejector pin (4). When the injection molding machine completes injection and the mold opens, the inclined ejector (1) slides along the set direction, pushing the first ejector plate (2) through its contact area (101) and the spring block (5). The first ejector plate (2) pushes the second ejector plate (3), which in turn drives the ejector pin (4) to push out towards the deep rib of the plastic part. The front end of the ejector pin (4) is inserted into the deep rib to prevent the plastic part from sticking to the inclined ejector (1) due to the clamping force. After the ejection is completed, the inclined ejector (1) returns to its original position, the spring block (5) returns to its original position due to the constraint of the first slot (102), the spring (6) releases the pressure, and the spring (6) pushes the second ejector plate (3). The second ejector plate (3) pushes the first ejector plate (2) to reset and drives the ejector pin (4) to retract, thus completing the reset. This structure, through the linkage of the double-layer ejector plate and the spring, eliminates the need to process a high-precision guiding mechanism, reducing the difficulty and cost of mold manufacturing.
[0024] Please see Figures 1 to 3 In another embodiment, the contact surface between the first slot (102) and the spring block (5) is an inclined surface, and the inclination direction of the inclined surface is consistent with the sliding direction of the inclined top (1). The inner contact surface of the first slot (102) is processed into an inclined surface with an inclination angle of 10°. The spring block (5) matches the inclined surface. When the inclined top (1) returns to its original position, the spring block (5) slides along the inclined surface and applies a component force perpendicular to the movement direction of the inclined top (1), which effectively reduces the friction between the inclined top (1) and the spring block (5), avoids reset jamming, and at the same time ensures that the pushing force of the first top plate (2) on the ejector pin (4) is uniform.
[0025] Please see Figures 1 to 3 In another embodiment, the axis of the ejector pin (4) is parallel to the direction of movement of the second top plate (3), and the front end of the ejector pin extends to the end of the deep rib of the plastic part. The ejector pin (4) is fixed in the second slot (301) of the second top plate (3) with its axis parallel to the direction of movement of the second top plate (3), ensuring that the ejector pin (4) always acts perpendicularly to the inner wall of the deep rib during ejection; the extension length of the front end of the ejector pin (4) is 95% of the length of the deep rib, which can fully release the clamping force between the plastic part and the inclined ejector (1) during ejection, solving the sticking problem caused by insufficient ejector pin stroke in traditional inclined ejectors.
[0026] Please see Figures 1 to 3 In another embodiment, the two ends of the spring (6) abut against the second top plate (3) and the fixed base of the mold respectively. One end of the spring (6) is welded to the mounting hole of the second top plate (3), and the other end is embedded in the groove of the mold fixed base. When the second top plate (3) moves forward with the inclined ejector (1), the spring (6) is compressed and stores energy due to the restriction of the base. When returning to the original position, the spring (6) releases its elasticity and pushes the second top plate (3) to reset, ensuring the synchronicity of the ejector pin (4) retraction action and avoiding deformation of the plastic part caused by the lag of the ejector pin on one side.
[0027] Please see Figures 1 to 3 In another embodiment, the second slot (301) of the second top plate (3) is a transverse through hole, and the ejector pin (4) is fixed in the second slot (301) by threads or snap fasteners. The second slot (301) is a transverse circular hole with a diameter of 5 mm. The tail of the ejector pin (4) is provided with external threads, and it is fixed by screwing into the second slot (301); or the tail of the ejector pin (4) is provided with an annular groove, and it is locked by an elastic snap fastener in the second slot (301). This structure allows for quick replacement of ejector pins (4) of different specifications, adapts to the production needs of multiple models of deep rib products, and reduces mold modification costs.
[0028] Please see Figures 1 to 3 In another embodiment, the first top plate (2) and the second top plate (3) are slidably connected by a pin or guide post. Two guide posts (7) are installed between the first top plate (2) and the second top plate (3), with both ends of the guide posts (7) inserted into the guide holes of the two top plates respectively, to ensure that the two top plates can only move relative to each other in a predetermined direction and avoid deflection; in addition, a low-friction coefficient coating can be applied to the surface of the guide posts (7) to reduce movement resistance and further reduce the energy consumption of mold operation.
[0029] Please see Figures 1 to 3 In another embodiment, the cross-sectional shape of the spring block (5) matches the first slot (102), and the spring block (5) is made of high wear-resistant alloy steel. The spring block (5) is designed with a rectangular cross-section, and the gap between it and the inside of the first slot (102) is controlled within 0.05mm; the spring block (5) is made of SKD61 alloy steel and is quenched, with a surface hardness of HRC60, ensuring service life under frequent extrusion operations and avoiding failure of the ejector pin return due to wear.
[0030] Please see Figures 1 to 3 In another embodiment, the surface of the mating area (101) of the inclined top (1) is provided with an anti-stick coating. The surface of the mating area (101) is sprayed with a 0.1 mm thick Teflon coating, which is heat resistant and has a coefficient of friction of less than 0.1, to prevent the plastic part from adhering to the inclined top (1) due to material stickiness during high-temperature injection molding, thereby reducing the frequency of cleaning and maintenance and improving production efficiency.
[0031] Please see Figures 1 to 3 In another embodiment, the number of ejector pins (4) is 3-6 groups, and each group corresponds to the center line of a deep rib. When the injection molded part has 4 deep ribs, the ejector pins (4) are set to 4 groups, and the front end of each group of ejector pins is aligned with the center axis of the deep rib, so as to ensure that the ejection force is evenly applied to the position of the plastic part that is most easily clamped, and to avoid local stress concentration that may cause product cracking or residual burrs.
[0032] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.
Claims
1. A high speed ejector pin lift and stripper structure comprising, The utility model relates to a plastic injection mould, which comprises a slanted ejector pin (1), a first ejector plate (2), a second ejector plate (3), an ejector pin (4), an elastic block (5) and a spring (6). One end of the slanted ejector pin (1) is provided with a matching area (101), and the matching area (101) is provided with at least one first slot hole (102), and the elastic block (5) is embedded in the first slot hole (102); The first ejector plate (2) is matched with the matching area (101) of the slanted ejector pin (1), and the second ejector plate (3) is matched with the first ejector plate (2); The second ejector plate (3) is provided with a plurality of second slot holes (301) for fixing the ejector pin (4), and the ejector pin (4) is clamped in the second slot hole (301); The second ejector plate (3) is further provided with a plurality of springs (6), and the springs (6) are uniformly distributed at the gaps between the ejector pins (4).
2. The high speed thimble raising ejection structure according to claim 1, wherein, The contact surface between the first slot hole (102) and the elastic block (5) is an inclined surface, and the inclined direction of the inclined surface is consistent with the sliding direction of the slanted ejector pin (1).
3. The high speed thimble raising ejection structure of claim 1, wherein, The axis of the ejector pin (4) is parallel to the movement direction of the second ejector plate (3), and the front end of the ejector pin extends to the end of the deep bone position of the plastic part.
4. The high speed thimble raising ejection structure of claim 1, wherein, The two ends of the spring (6) are respectively abutted between the second ejector plate (3) and the fixed base of the mould.
5. The high speed thimble raising ejection structure of claim 1 wherein, The second slot hole (301) of the second ejector plate (3) is a transverse through hole, and the ejector pin (4) is fixed in the second slot hole (301) through threads or buckles.
6. The high speed thimble raising ejection structure of claim 1, wherein, The first ejector plate (2) and the second ejector plate (3) are connected through a pin shaft or a guide column.
7. The high speed thimble raising ejection structure of claim 1 wherein, The cross-sectional shape of the elastic block (5) matches that of the first slot hole (102), and the material of the elastic block (5) is high-wear-resistance alloy steel.
8. The high speed thimble raising ejection structure of claim 1, wherein, The surface of the matching area (101) of the slanted ejector pin (1) is provided with an anti-sticking coating.
9. The high speed thimble raising ejection structure of claim 1 wherein, The number of the ejector pins (4) is 3-6 groups, and each group corresponds to the center line of a deep bone position.