Ejection device and mold
By designing limiting components and a multi-stage ejection structure in the injection molding machine, the problem of ejector plate springback during the demolding process of injection molded products was solved, achieving a stable and reliable ejection process and improving production efficiency and product quality.
Patent Information
- Application Number
- CN202522471026.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-21
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-11-21
AI Technical Summary
Existing injection molded products are prone to sticking to the mold during demolding due to their large contact area. This makes it difficult to effectively separate the mold using conventional single ejection and core-pulling methods. Furthermore, the ejector plate in secondary ejection devices has a high risk of springback, which affects production efficiency and product quality.
Design an ejection device including a limiting component and multiple ejector rods. By cooperating with the limiting component and the mating component, the position of the ejection plate is restricted to ensure the stability of the ejection process. The movement of the ejection plate is controlled by the first and second ejection stages respectively to prevent rebound.
It improves the smoothness of demolding of injection molded parts, reduces the risk of ejector pin breakage and damage, enhances the efficiency of the production process and product quality, and ensures the stability and reliability of the ejection process.
Smart Images
Figure CN223821034U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mold technology, and in particular to an ejection device and a mold. Background Technology
[0002] Some injection molded products, due to their unique structural design, cannot be demolded using only conventional single ejection and core-pulling methods. This is because these products have a relatively large contact area with the lower mold cavity, making them prone to sticking and extremely difficult to demold. To solve this problem, a secondary ejection device is usually required to facilitate smooth demolding. In existing injection molding machine structures, the secondary ejection device involves two relatively movable ejector plates connected by a stop screw. However, relying on the stop screw to hold the ejector plates after ejection is unstable, with the ejector plates at risk of springback and breakage of the ejector pins. This increases the uncertainty of the secondary ejection process, affects production efficiency, and makes maintenance difficult if ejector pins or screws break. Utility Model Content
[0003] The main purpose of this invention is to provide an ejection device and mold that can limit the position of the ejection plate during the secondary ejection process, prevent the ejection plate from springing back, and make the ejection process of the injection molded part stable and reliable.
[0004] To achieve the above objectives, this utility model proposes an ejection device, which includes:
[0005] The plate structure includes a first top-out plate, a second top-out plate, and a bottom plate arranged sequentially in the vertical direction, wherein both the first top-out plate and the second top-out plate are movable in the vertical direction.
[0006] The first ejection structure includes a plurality of first ejector rods disposed on the first ejection plate;
[0007] The second ejection structure includes a plurality of second ejector rods disposed on the second ejection plate, the second ejector rods being able to pass through the first ejection plate;
[0008] The limiting assembly includes a limiting member and a mating member that cooperate with each other. The limiting member and the mating member are movably disposed relative to each other. The limiting member is disposed on the second top plate, and the mating member is disposed on the bottom plate.
[0009] The ejection device has a first ejection stage and a second ejection stage;
[0010] During the first ejection stage, the first ejection plate and the second ejection plate respectively drive the first ejector rod and the second ejector rod to move upward synchronously;
[0011] During the second ejection stage, the first ejection plate drives the first ejector rod to move upward relative to the second ejection plate, and the movement of the first ejection plate can trigger the movement of the limiting member, so that the limiting member and the mating member abut against each other to limit the relative movement of the second ejection plate and the bottom plate.
[0012] In one embodiment, the second ejector plate has a groove on one side in the horizontal direction;
[0013] One end of the limiting member is slidably installed in the groove, and the other end of the limiting member has a first position that is received in the groove and a second position that protrudes from the groove;
[0014] The mating component is fixedly installed on the base plate and is located on one side of the first ejector plate and the second ejector plate in the horizontal direction;
[0015] When the first ejection stage transitions to the second ejection stage, the limiting member changes from the first position to the second position to abut against the upper end of the mating member.
[0016] In one embodiment, the limiting member is connected to the inner wall of the groove by an elastic member.
[0017] In one embodiment, the limiting member has a through hole on the side facing the mating member, and the elastic member includes a spring;
[0018] The limiting assembly also includes a limiting bolt, the end of which passes through the through hole and is fixed to the inner wall of the groove;
[0019] The spring is located outside the limiting bolt, and both ends of the spring abut against the inner wall of the groove and the limiting member.
[0020] In one embodiment, the limiting component further includes a pull rod, which is fixed to the peripheral side of the first ejector plate, and the lower end of the pull rod engages with the limiting member via an inclined surface.
[0021] In the first position, the lower end of the pull rod abuts against the limiting member; in the second position, the pull rod separates from the limiting member.
[0022] In one embodiment, the mating component has a recessed groove on the side facing the first ejector plate, and the groove is arranged to extend upwards.
[0023] The pull rod can be movably inserted into the groove.
[0024] In one embodiment, the mating member is stepped on the side facing the first ejector plate to define a clearance between the first ejector plate and the mating member.
[0025] In one embodiment, the surface of the limiting member is recessed with a plurality of oil grooves arranged at intervals, and the plurality of oil grooves are used to fill lubricating oil.
[0026] In one embodiment, the second top plate includes a first panel and a second panel stacked in the vertical direction, wherein:
[0027] The first panel has the groove on its peripheral side; or,
[0028] The second panel has the groove on its peripheral side; or,
[0029] The first panel and the second panel together define the groove.
[0030] In one embodiment, the ejection device further includes a locking device, which locks the first ejection plate and the second ejection plate together during the first ejection stage; and unlocks the locking device during the second ejection stage, allowing the first ejection plate and the second ejection plate to move relative to each other.
[0031] In one embodiment, the ejection device further includes a drive unit connected to the first ejection plate.
[0032] In one embodiment, the ejection device further includes a first height limiting member and a second height limiting member. The first height limiting member cooperates with the first ejection plate to limit the travel of the first ejection plate, and the second height limiting member cooperates with the second ejection plate to limit the travel of the second ejection plate.
[0033] This utility model also proposes a mold, including an ejection device, the ejection device comprising:
[0034] The plate structure includes a first top-out plate, a second top-out plate, and a bottom plate arranged sequentially in the vertical direction, wherein both the first top-out plate and the second top-out plate are movable in the vertical direction.
[0035] The first ejection structure includes a plurality of first ejector rods disposed on the first ejection plate;
[0036] The second ejection structure includes a plurality of second ejector rods disposed on the second ejection plate, the second ejector rods being able to pass through the first ejection plate;
[0037] The limiting assembly includes a limiting member and a mating member that cooperate with each other. The limiting member and the mating member are movably disposed relative to each other. The limiting member is disposed on the second top plate, and the mating member is disposed on the bottom plate.
[0038] The ejection device has a first ejection stage and a second ejection stage;
[0039] During the first ejection stage, the first ejection plate and the second ejection plate respectively drive the first ejector rod and the second ejector rod to move upward synchronously;
[0040] During the second ejection stage, the first ejection plate drives the first ejector rod to move upward relative to the second ejection plate, and the movement of the first ejection plate can trigger the movement of the limiting member, so that the limiting member and the mating member abut against each other to limit the relative movement of the second ejection plate and the bottom plate.
[0041] In this invention, after the mold opens, the ejection device enters the first ejection stage. The first and second ejection plates move upward together, driving multiple first and second ejector rods to rise and contact the injection molded part. At this time, the limiting parts and mating parts avoid each other, ensuring smooth ejection. When the first and second ejection plates rise together to a predetermined distance, the second ejection stage begins. The first ejection plate can rise further relative to the second ejection plate, simultaneously triggering the limiting parts and mating parts to engage, effectively limiting the maximum height of the second ejection plate in this stage and preventing it from falling and rebounding during the ejection process of the first ejection plate. The first ejection plate continues to rise, driving multiple first ejector rods to eject the injection molded part a certain distance again, completing the demolding of the injection molded part. The limiting components and mating components can limit the position of the second ejector plate during the second ejection stage, thereby ensuring ejection stability, improving the smoothness of the demolding process, reducing the risk of injection molded parts damage and ejector pin breakage caused by ejection instability, and improving the efficiency and product quality of the entire production process. Attached Figure Description
[0042] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0043] Figure 1 A schematic diagram of an embodiment of the ejection device provided by this utility model;
[0044] Figure 2 for Figure 1 A schematic diagram of the ejector device during the second ejection stage;
[0045] Figure 3 This is a schematic diagram of the limit component.
[0046] Figure 4 for Figure 3 Exploded view of the middle limit component.
[0047] Explanation of icon numbers:
[0048] 100. Ejection device; 1. First ejection plate; 11. Groove; 2. Second ejection plate; 21. First panel; 22. Second panel; 3. Base plate; 4. Limiting assembly; 41. Limiting component; 411. Oil groove; 42. Mating component; 421. Slide groove; 43. Spring; 44. Limiting bolt; 45. Pull rod; 40. Clearance gap; 5. Fastening device; 6. Drive unit; 7. First height limiting component; 8. Second height limiting component.
[0049] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0050] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0051] It should be noted that if the embodiments of this utility model involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.
[0052] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0053] Some injection-molded products, due to their unique structural design, cannot be demolded using conventional single ejection and core-pulling methods alone. This is because these injection-molded products have a relatively large contact area with the lower mold cavity, making them prone to sticking and resulting in exceptionally difficult demolding. Specifically, due to the increased contact area, the adhesion between the injection-molded product and the mold also increases during cooling and shrinkage, making it difficult for conventional single ejection and core-pulling methods to effectively separate the product from the mold, thus affecting production efficiency and product quality.
[0054] To solve this problem, a secondary ejection device is typically used to facilitate the smooth demolding of injection-molded products. In existing injection molding machine structures, the design and working principle of the secondary ejection device are relatively complex, involving two relatively movable ejector plates connected by bolts. However, this method of relying on bolts to hold the ejector plates in place after ejection has certain shortcomings in practical operation. Specifically, the bolt connection is unstable, and there is a risk of the ejector plates springing back during ejection. This springback can easily lead to the ejector pin breaking and also makes the secondary ejection process unpredictable, thus affecting production efficiency and product quality.
[0055] Furthermore, maintenance and repair are difficult in the event of ejector pin or screw breakage, requiring additional time and resources, further increasing production costs and downtime. Therefore, improving the stability and reliability of the secondary ejection device while ensuring smooth demolding of injection-molded products has become a crucial issue for injection molding process optimization and equipment improvement.
[0056] This utility model proposes an ejection device and mold to solve the problem of ejector plate springback in existing secondary ejection structures. By adding a structure to restrict the position of the ejector plate, the position of the ejector plate is restricted during the secondary ejection process, making the ejection process of the injection molded part stable and reliable.
[0057] Please refer to Figures 1 to 3The ejection device 100 includes a plate structure, a first ejection structure, a second ejection structure, and a limiting assembly 4. The plate structure includes a first ejection plate 1, a second ejection plate 2, and a base plate 3 arranged sequentially in the vertical direction. Both the first ejection plate 1 and the second ejection plate 2 are movable in the vertical direction. The first ejection structure includes a plurality of first ejector rods disposed on the first ejection plate 1. The second ejection structure includes a plurality of second ejector rods disposed on the second ejection plate 2. The second ejector rods are capable of passing through the first ejection plate 1. The limiting assembly 4 includes a limiting member 41 and a mating member 42 that cooperate with each other. The limiting member 41 and the mating member 42 are capable of moving in the vertical direction. The ejection device 100 has a first ejection stage and a second ejection stage. In the first ejection stage, the first ejection plate 1 and the second ejection plate 2 drive the first ejector rod and the second ejector rod to move upward synchronously. In the second ejection stage, the first ejection plate 1 drives the first ejector rod to move upward relative to the second ejection plate 2, and when the first ejection plate 1 moves, it can trigger the movement of the limiting member 41, so that the limiting member 41 and the mating member 42 abut against each other to limit the relative movement of the second ejection plate 2 and the bottom plate 3.
[0058] In the technical solution of this utility model, after the mold opens, the ejection device 100 enters the first ejection stage. The first ejection plate 1 and the second ejection plate 2 move upward together to drive multiple first ejector rods and multiple second ejector rods to rise and contact the injection molded part. At this time, the limiting member 41 and the mating member 42 avoid each other to ensure the smooth progress of the ejection action. When the first ejection plate 1 and the second ejection plate 2 are lifted together to a predetermined distance, the second ejection stage begins. The first ejection plate 1 can be further lifted relative to the second ejection plate 2. At the same time, it can trigger the limiting member 41 and the mating member 42 to abut against each other, thereby effectively limiting the limit height of the second ejection plate 2 in the current stage and preventing it from falling and rebounding during the ejection process of the first ejection plate 1. The first ejection plate 1 continues to rise, driving multiple first ejector rods to eject the injection molded part a certain distance again, completing the demolding of the injection molded part. The limiting component 41 and the mating component 42 can limit the position of the second ejector plate 2 during the second ejection stage, thereby ensuring ejection stability, improving the smoothness of the demolding process, reducing the risk of injection molded parts damage and ejector pin breakage caused by ejection instability, and improving the efficiency and product quality of the entire production process.
[0059] It should be noted that the technical solution of this utility model is to add a limiting component 4 to the existing mold, rather than replacing the plug screws. The first ejector plate 1 and the second ejector plate 2 are still connected to the base plate 3 through multiple plug screws to control the movement of the first ejector plate 1 and the second ejector plate 2 after the mold is opened.
[0060] In the technical solution of this utility model, during the second ejection stage, the first ejection plate 1 moves relative to the second ejection plate 2 to trigger the holding mechanism of the limiting member 41 and the mating member 42, thereby cooperating with the plug screw to restrict the second ejection plate 2 from rebounding downward.
[0061] Since the first ejector pin and the second ejector pin correspond to different positions on the injection molded part, their lengths can be the same or different. Their outer diameters can also be the same or different. In some embodiments, corresponding to injection molded components in cabinet-type products, one of the first ejector pin and the second ejector pin is inclined outwards and flattened to provide an oblique ejection force to the injection molded part during ejection, while the other is vertically oriented and cylindrical to provide a vertical ejection force to the injection molded part during ejection.
[0062] The limiting member 41 and the mating member 42 can be configured to move relative to each other in the vertical direction or in the horizontal direction. This utility model does not impose any limitation on this.
[0063] The limiting member 41 and the mating member 42 are locked together. This can be achieved by the limiting member 41 and the mating member 42 abutting each other at their end faces, or by the limiting member 41 and the mating member 42 engaging with hooks to achieve the function of limiting.
[0064] In some embodiments, please refer to Figure 2 The second ejector plate 2 has a groove 11 on one side in the horizontal direction; one end of the limiting member 41 is slidably installed in the groove 11, and the other end of the limiting member 41 has a first position that is received in the groove 11 and a second position that protrudes from the groove 11; the mating member 42 is fixedly installed on the base plate 3 and is located on one side of the first ejector plate 1 and the second ejector plate 2 in the horizontal direction; since the mating member 42 is fixed on the base plate 3, the mating member 42 remains fixed to the base plate 3 in both the first ejection stage and the second ejection stage; specifically, in the first ejection stage, the limiting member 41 is in the first position and received in the groove 11, so during the joint movement of the first ejector plate 1 and the second ejector plate 2 relative to the base plate 3... In this process, the limiting member 41 and the mating member 42 can maintain a horizontally offset relative position. As the second ejector plate 2 is raised, the limiting member 41 moves upward relative to the mating member 42. When the first ejection stage transitions to the second ejection stage, the positional relationship between the limiting member 41 and the mating member 42 has changed from being horizontally opposite to being vertically opposite. When the limiting member 41 is triggered to change from the first position to the second position, the limiting member 41 protrudes from the groove 11 so as to abut against the upper end of the mating member 42. Even if the second ejector plate 2 has a tendency to rebound, under the abutment of the limiting member 41 and the mating member 42, the second ejector plate 2 cannot continue to move downward and can only maintain the current height position.
[0065] It should be noted that the ejector plate has an upper end face, a lower end face, and a peripheral side face.
[0066] It should be understood that when the ejector device 100 is reset, the limiting member 41 can be restored from the second position to the first position to allow the second ejector plate 2 to move downward.
[0067] The switching between the first and second positions of the limiting member 41 can be either actively driven or passively driven. Considering the high-temperature environment during mold operation, an actively driven mechanism would be easily damaged by high temperatures. Therefore, a passively driven form is preferred. For example, a slanted bar is provided on the first ejector plate 1, which engages with the limiting member 41 on the second ejector plate 2 via a slanted surface. Using the principle of a wedge, when the first ejector plate 1 moves upward or downward relative to the second ejector plate 2, the limiting member 41 can be driven to move horizontally.
[0068] In this embodiment, the limiting member 41 is connected to the inner wall of the groove 11 by an elastic member. The elastic member provides a preload force for the initial position of the limiting member 41 and facilitates its automatic ejection or automatic reset. In this embodiment, during the first ejection stage, the limiting member 41 is always abutted against the side wall of the mating member 42 under the action of the elastic member. After the limiting member 41 is lifted to a certain height by the second ejection plate 2, the mating member 42 no longer obstructs the opening of the groove 11. At this time, under the rebound force of the elastic member, the limiting member 41 automatically ejects, thereby automatically changing from the first position to the second position.
[0069] The specific form of the elastic element is not limited; it can be a spring 43, a sheet, a high-temperature resistant rubber part, etc.
[0070] Furthermore, the limiting member 41 has a through hole on the side facing the mating member 42, and the elastic member includes a spring 43; the limiting assembly 4 also includes a limiting bolt 44, the end of which passes through the through hole and is fixed to the inner wall of the groove 11; the spring 43 is located outside the limiting bolt 44, and both ends of the spring 43 abut against the inner wall of the groove 11 and the limiting member 41. The limiting bolt 44 and the spring 43 cooperate to guide the linear movement of the limiting member 41 and limit the travel of the limiting member 41.
[0071] It should be understood that, in order to prevent the limiting member 41 from deflecting relative to the limiting bolt 44, at least two limiting bolts 44 should be provided to achieve the effect of preventing rotation.
[0072] The through hole can be set as a stepped hole, which allows the nut of the limit bolt 44 to be hidden.
[0073] In order to reset the elastic element back to the first position, in some embodiments, please refer to... Figures 3 to 4The limiting component 4 also includes a pull rod 45, which is fixed to the circumferential side of the first ejector plate 1. The lower end of the pull rod 45 engages with the limiting member 41 via an inclined surface. In a first position, the lower end of the pull rod 45 abuts against the limiting member 41; in a second position, the pull rod 45 separates from the limiting member 41. Specifically, the parts where the pull rod 45 and the limiting member 41 engage are both designed as inclined surfaces. To ensure that the limiting member 41 can be reset when the pull rod 45 moves downward, the inclined surface at the lower end of the pull rod 45 should extend from top to bottom in a direction away from the first ejector plate 1, and the inclined surface at the upper end of the limiting member 41 should also extend from top to bottom in a direction away from the first ejector plate 1.
[0074] It should be understood that the lower end face of the pull rod 45 can be entirely set as an inclined plane, or the lower end face of the pull rod 45 can be an inclined plane combined with a horizontal straight section. The side end face of the limiting member 41 can be entirely set as an inclined plane, or the side end face of the limiting member 41 can be an inclined plane combined with a vertical straight section.
[0075] Furthermore, the mating part 42 has a recessed groove 421 on the side facing the first ejector plate 1, and the groove 421 is arranged upwards and through; the pull rod 45 can be movably inserted into the groove 421. The pull rod 45 and the limiting part 41 are engaged through the groove 421, thereby enabling the pull rod 45 to be linearly guided. It should be understood that in the first ejection stage, the pull rod 45 is in the groove 421, and in the second ejection stage, the pull rod 45 is disengaged from the groove 421.
[0076] The specific shape of the pull rod 45 is determined based on the thickness of the first ejector plate 1 and the position of the limiting member 41. In this embodiment, the pull rod 45 includes two first extension segments extending in the vertical direction and one second extension segment extending in the horizontal direction. The two first extension segments are spaced apart in the horizontal direction and in the vertical direction, and the second extension segment connects the two first extension segments. The second extension segment is located between the two first extension segments, and its length is determined according to the actual installation space and structural requirements to ensure the stability and reliability of the fit between the pull rod 45 and components such as the limiting member 41 and the first ejector plate 1.
[0077] In other embodiments, the lever 45 may also be configured as an "L" shape or an "I" shape.
[0078] In addition, the mating part 42 is stepped on the side facing the first ejector plate 1 to define a clearance 40 between the first ejector plate 1 and the mating part 42. The mating part 42 is located on the side of the first ejector plate 1 and the second ejector plate 2. Considering the movable fit between the parts, the mating part 42 is partially recessed on the side facing the first ejector plate 1, thereby creating a larger clearance between the mating part 42 and the first ejector plate 1.
[0079] In some embodiments, since the mating part 42 is partially recessed to form a clearance 40, an upwardly facing stepped surface is formed on the mating part 42. The stepped surface can approach the lower end of the limiting part 41 after the mold is closed, thereby serving as a positioning base.
[0080] The mating part 42 is also stepped on the side facing away from the first ejector plate 1 to create clearance space and avoid interference with the inner parts.
[0081] Please refer to Figure 4 The surface of the limiting member 41 is recessed with multiple oil grooves 411 arranged at intervals, and the multiple oil grooves 411 are used to fill lubricating oil. During the movement of the limiting member 41 along the depth direction of the groove 11, the lubricating oil can fill the gap between the limiting member 41 and the inner wall of the groove 11, thereby ensuring smoother movement of the limiting member 41. It should be understood that multiple oil grooves 411 are provided on the peripheral side surface of the limiting member 41.
[0082] To ensure the limitation and guidance of the second push rod, the second push plate 2 includes a first panel 21 and a second panel 22 stacked in the vertical direction. The first panel 21 and the second panel 22 are fixedly connected and can move synchronously.
[0083] In some embodiments, the side of the first panel 21 is provided with a groove 11; in this case, the limiting member 41 cooperates with the first panel 21. In some embodiments, the side of the second panel 22 is provided with a groove 11; in this case, the limiting member 41 cooperates with the second panel 22.
[0084] In this embodiment, the first panel 21 and the second panel 22 together define the groove 11. Specifically, the first panel 21 and the second panel 22 each have a second groove 11 on their opposite end faces in the vertical direction. The two second grooves 11 pass through the side facing the mating member 42. After the first panel 21 and the second panel 22 are locked, the two second grooves 11 together define a laterally open groove 11. With this configuration, the height of the limiting member 41 after installation is more suitable, and the impact on the strength of the first panel 21 and the second panel 22 is smaller. When the limiting member 41 abuts against the mating member 42, the limiting member 41 does not need to bear the weight of the entire ejector plate, and the first panel 21 is less prone to cracking.
[0085] To ensure synchronous movement of the first ejector plate 1 and the second ejector plate 2 during the first ejection stage, the ejection device 100 also includes a latching device 5. In mold design, the latching device 5 is a key component commonly used for mold plate connection, ensuring precise coordination and stable operation of various components during mold opening, closing, and ejection. This invention does not limit the specific structure of the latching device 5; any structure common in the field can be used, as long as it meets the component coordination requirements of different ejection stages. In this embodiment, the latching device 5 is configured to connect the first ejector plate 1 and the second ejector plate 2 during the first ejection stage, allowing them to move synchronously as a whole. The latching device 5 includes a latching mechanism and a latching seat that cooperate with each other. The latching mechanism is mounted on the first ejector plate 1, and the latching seat is mounted on the second ejector plate 2, or vice versa. At the start of the first ejection stage, the latching mechanism and the latching seat are tightly engaged, and the latching device 5 locks the first ejection plate 1 and the second ejection plate 2 into one unit, ensuring that the first ejection plate 1 and the second ejection plate 2 remain synchronized during the ejection process and preventing relative displacement between them, thereby ensuring the stability and accuracy of the ejection process. In the second ejection stage, the latching device 5 unlocks, the latching mechanism and the latching seat separate, allowing the first ejection plate 1 to move relative to the second ejection plate 2.
[0086] It should be understood that the latching device 5 and the limiting component 4 are not single installations, but rather multiple installations are provided according to actual needs. Specifically, the latching device 5 is arranged on both opposite sides of the ejector device 100 to ensure the symmetry and stability of the structure. Through this design, the latching device 5 can effectively bear the entire weight of the first ejector plate 1 and the second ejector plate 2, thereby ensuring the normal operation and safety of the entire device. The limiting component 4 is located on the inner side of the ejector device 100.
[0087] Based on the locking device 5, the ejection device 100 also includes a drive unit 6, which is connected to the first ejector plate 1. The drive unit 6 can be a hydraulic cylinder, with its cylinder seat fixed to the lower mold base in the mold. The hydraulic cylinder extends and retracts to raise and lower the first ejector plate 1. When the locking device 5 locks the first ejector plate 1 and the second ejector plate 2, the hydraulic cylinder extends and retracts to move the first ejector plate 1 and the second ejector plate 2 synchronously. When the locking device 5 unlocks, the hydraulic cylinder extends and retracts only to move the first ejector plate 1, thus achieving drive control during the secondary ejection process. The drive unit 6 can also be a top roller of an injection molding machine, which will not be specifically described in this invention.
[0088] To enhance the cooperation between the drive unit 6 and the first ejector plate 1, a through hole is provided on the first ejector plate 1, and a limiting boss is provided on the inner wall of the through hole. Two mating bosses are provided at the end of the hydraulic cylinder, with the two mating bosses located on the upper and lower sides of the limiting bosses respectively. Considering the need to avoid the mating bosses, a corresponding through hole can be provided on the second ejector plate 2.
[0089] When the second ejector plate 2 is composed of the first panel 21 and the second panel 22, the corresponding part of the fastening device 5 can be set on the first panel 21 or on the second panel 22.
[0090] Furthermore, the ejection device 100 also includes a first height limiting member 7 and a second height limiting member 8. The first height limiting member 7 cooperates with the first ejection plate 1 to limit the travel of the first ejection plate 1, and the second height limiting member 8 cooperates with the second ejection plate 2 to limit the travel of the second ejection plate 2.
[0091] In one embodiment, the lower end of the first height limiting member 7 is fixed to the base plate 3 or the second ejector plate 2 to limit the upward movement of the first ejector plate 1, and the lower end of the second height limiting member 8 is fixed to the base plate 3 to limit the upward movement of the second ejector plate 2. Specifically, the first height limiting member 7 and the second height limiting member 8 can be bolts or limit posts, with corresponding through holes on the first ejector plate 1 and the second ejector plate 2; a first clearance groove is provided on the first ejector plate 1. It should be understood that when the first height limiting member 7 and the second height limiting member 8 are bolts, the first height limiting member 7 passes through the second ejector plate 2, and the height position is reached when the nut of the first height limiting member 7 abuts against the bottom surface of the first clearance groove. A second clearance groove is provided on the second ejector plate 2, and the height position is reached when the nut of the second height limiting member 8 abuts against the bottom surface of the second clearance groove.
[0092] In other embodiments, the first height limiting member 7 and the second height limiting member 8 are provided with different heights and are respectively provided on different parts.
[0093] In the technical solution of this utility model, taking the cabinet product as an example, based on the large contact area required for core pulling, a secondary ejection is set to prevent problems such as sticking to the mold and clamping parts, so as to ensure stable production.
[0094] While the first ejector plate 1 and the second ejector plate 2 are held in place by the screws, a limiting component 4 is provided. Specifically, the mating part 42 is fixed to the base plate 3, and the limiting component 41 is set in the groove 11 defined by the first panel 21 and the second panel 22 by two limiting bolts 44. Two springs 43 are sleeved on the outside of the two limiting bolts 44, and the pull rod 45 is fixed to the first ejector plate 1. Two limiting posts are set as the first height limiting component 7 and the second height limiting component 8. The slightly higher limiting post determines the first ejection height, and the height difference between the slightly lower limiting post and the higher limiting post determines the second ejection height.
[0095] After the mold completes the actions of mold closing and injection molding, when the mold opens, the hydraulic cylinder on the lower mold base retracts. Under the action of the locking device 5, it can drive the first panel 21, the second panel 22, and the first ejector plate 1 to be ejected together. The ejection height is determined by the first height limiting member 7 fixed on the first panel 21, completing the first ejection stage. When the hydraulic cylinder continues to work, the slightly higher limiting post will prevent the first panel 21 and the second panel 22 from continuing to move. Under the force of the second height limiting member 8, the locking device 5... The system will complete the release action, causing the first ejector plate 1 and the first panel 21 to separate. This allows the first ejector plate 1 to be ejected independently by the hydraulic cylinder. Simultaneously, the pull rod 45 fixed to the first ejector plate 1 will disengage from the limiting member 41, causing the limiting member 41 to pop out under the action of the spring 43. The pop-out distance of the limiting member 41 is determined by the limiting bolt 44. After popping out, the limiting member 41 hooks onto the upper end of the mating member 42, with the lower end face of the limiting member 41 abutting against the upper end face of the mating member 42, thus achieving a height restriction effect. When the first ejector plate 1 moves until the first height limiting member 7 and the second height limiting member 8 are aligned, the second ejection stage is completed.
[0096] With the assistance of the limiting component 4 and the action of the stop screw, the second ejector plate 2 in the secondary ejection device 100 is effectively prevented from springing back during the ejection process. This design cleverly solves the springback problem common in traditional ejection devices 100, thereby ensuring the stability of the ejection action and ensuring that the product can be smoothly and steadily demolded from the mold. This stable and reliable ejection mechanism not only significantly improves the efficiency of mold use and product quality, but also greatly extends the service life of the mold, saving costs for enterprises and improving production efficiency.
[0097] This utility model also proposes a mold, which includes an ejection device 100. The specific structure of the ejection device 100 is as described in the above embodiments. Since the mold adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0098] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.
Claims
1. An ejection device, characterized in that, include: The plate structure includes a first top-out plate, a second top-out plate, and a bottom plate arranged sequentially in the vertical direction, wherein both the first top-out plate and the second top-out plate are movable in the vertical direction. The first ejection structure includes a plurality of first ejector rods disposed on the first ejection plate; The second ejection structure includes a plurality of second ejector rods disposed on the second ejection plate, the second ejector rods being able to pass through the first ejection plate; The limiting assembly includes a limiting member and a mating member that cooperate with each other. The limiting member and the mating member are movably disposed relative to each other. The limiting member is disposed on the second top plate, and the mating member is disposed on the bottom plate. The ejection device has a first ejection stage and a second ejection stage; During the first ejection stage, the first ejection plate and the second ejection plate respectively drive the first ejector rod and the second ejector rod to move upward synchronously; During the second ejection stage, the first ejection plate drives the first ejector rod to move upward relative to the second ejection plate, and the movement of the first ejection plate can trigger the movement of the limiting member, so that the limiting member and the mating member abut against each other to limit the relative movement of the second ejection plate and the bottom plate.
2. The ejection device as described in claim 1, characterized in that, The second top plate has a groove on one side in the horizontal direction; One end of the limiting member is slidably installed in the groove, and the other end of the limiting member has a first position that is received in the groove and a second position that protrudes from the groove; The mating component is fixedly installed on the base plate and is located on one side of the first ejector plate and the second ejector plate in the horizontal direction; When the first ejection stage transitions to the second ejection stage, the limiting member changes from the first position to the second position to abut against the upper end of the mating member.
3. The ejection device as described in claim 2, characterized in that, The limiting member is connected to the inner wall of the groove by an elastic member.
4. The ejection device as described in claim 3, characterized in that, The limiting member has a through hole on the side facing the mating member, and the elastic member includes a spring; The limiting assembly also includes a limiting bolt, the end of which passes through the through hole and is fixed to the inner wall of the groove; The spring is located outside the limiting bolt, and both ends of the spring abut against the inner wall of the groove and the limiting member.
5. The ejection device as described in claim 3, characterized in that, The limiting component also includes a pull rod, which is fixed to the circumferential side of the first top plate, and the lower end of the pull rod engages with the limiting component via an inclined surface. In the first position, the lower end of the pull rod abuts against the limiting member; in the second position, the pull rod separates from the limiting member.
6. The ejection device as described in claim 5, characterized in that, The mating component has a recessed groove on the side facing the first top plate, and the groove is arranged to extend upwards. The pull rod can be movably inserted into the groove.
7. The ejection device as described in claim 2, characterized in that, The mating component is stepped on the side facing the first ejector plate to define a clearance between the first ejector plate and the mating component.
8. The ejection device as described in claim 2, characterized in that, The surface of the limiting member is recessed with a plurality of oil grooves arranged at intervals, and the plurality of oil grooves are used to fill lubricating oil.
9. The ejection device as described in claim 2, characterized in that, The second top-mounted plate includes a first panel and a second panel stacked vertically, wherein: The first panel has the groove on its peripheral side; or, The second panel has the groove on its peripheral side; or, The first panel and the second panel together define the groove.
10. The ejection device as claimed in claim 1, characterized in that, The ejection device also includes a locking device. During the first ejection stage, the locking device locks the first ejection plate and the second ejection plate together. During the second ejection stage, the locking device unlocks, allowing the first ejection plate and the second ejection plate to move relative to each other.
11. The ejection device as claimed in claim 10, characterized in that, The ejection device further includes a drive unit, which is connected to the first ejection plate.
12. The ejection device as claimed in claim 1, characterized in that, The ejection device further includes a first height limiting member and a second height limiting member. The first height limiting member cooperates with the first ejection plate to limit the travel of the first ejection plate, and the second height limiting member cooperates with the second ejection plate to limit the travel of the second ejection plate.
13. A mold, characterized in that, Includes the ejection device as described in any one of claims 1 to 12.