Runner ejection mechanism and injection mold
By setting an anti-detachment mechanism at the tip of the ejector pin, the problem of unbalanced ejection of the sprue head in a single-sided submerged gating gate and runner is solved, achieving stable ejection of the sprue head, improving the utilization rate of plastic raw materials and production efficiency, and reducing manufacturing costs.
Patent Information
- Application Number
- CN202422618916.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-10-29
AI Technical Summary
Injection molds with single-sided submerged gates and runners are prone to ejection imbalance when ejecting the sprue, causing the sprue to slip and fail to eject automatically, requiring manual assistance, which affects production efficiency, increases runner volume, and reduces the utilization rate of plastic raw materials.
An anti-slip mechanism, including a slot, a limiting post, or a wedge post, is set at the top of the ejector pin to fix the material head and prevent slippage due to unbalanced force during ejection. This design has low cost and does not increase the flow channel volume.
This solved the problem of uneven material ejection, improved the utilization rate of plastic raw materials, reduced manufacturing costs, and increased production efficiency.
Smart Images
Figure CN223507603U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mold technology, and in particular to a runner ejection mechanism and an injection mold. Background Technology
[0002] As quality requirements for injection molded products become increasingly stringent, injection molds are typically designed with submarine gates or horn gates to avoid leaving gate marks on the product surface. These gates are automatic gate cut-off gates, meaning the gate is broken off by ejector pins, thus separating the product from the runner. Due to their automatic gate cut-off nature, they save on the cost of manual or machine gate removal, making them very common in injection mold design.
[0003] Injection molding involves injecting molten plastic into the mold using an injection molding machine. The molten plastic then flows through the runner and gate to the product molding area (mold core and cavity) to complete the product molding. After the runner, gate, and product cool, ejector pins push them out of the core. During the injection molding process, a sprue is generated in the runner. This sprue needs to be removed after each molding cycle. Currently, traditional horn-shaped runner structures typically use ejector pins. When the mold opens, the ejector pins move upwards, subjecting the sprue in the horn-shaped runner connected to the gate to a significant ejection force, causing it to bend and deform, and eventually eject from the mold. In injection molding, the stability of the ejection system and the balance of ejection forces are key factors for achieving high-efficiency production and ensuring product quality. Typically, during mold design, engineers employ specific design methods based on the actual product and runner conditions to achieve this balance during ejection.
[0004] like Figures 1 to 3 As shown, for injection mold 1 with only a single-sided submerged gate and runner, when ejector pin 2 pushes out the sprue 3, the ejection force on one side of the horn-shaped runner is unbalanced, which easily leads to ejection slippage. The sprue 3 in the runner and gate cannot be broken off, and the sprue 3 cannot be ejected from the injection mold 1. At this time, manual assistance is required to remove it, which is time-consuming and labor-intensive, resulting in reduced production efficiency.
[0005] To address the issues raised in the appeal, commonly used improvement methods in injection mold design include: Figures 4 to 5 As shown, this involves adding a gating gate and runner on the opposite side to achieve force balance during ejection. However, a significant drawback of this design is the increased runner volume, which reduces the utilization rate of plastic raw materials and increases manufacturing costs. Therefore, this invention aims to solve the problem of unbalanced ejection from a single-sided gating gate and reduce runner volume, thereby improving the utilization rate of plastic raw materials. Utility Model Content
[0006] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a runner ejection mechanism and injection mold to solve the problem that the material head of the injection mold with a single-sided submerged gate and runner is difficult to eject in the existing technology.
[0007] The objective of this utility model is achieved through the following technical solution:
[0008] This utility model provides a flow channel ejection mechanism, including an ejector pin and an anti-detachment mechanism. The anti-detachment mechanism is located at the top of the ejector pin and is used to prevent the ejector pin from detaching from the material head during the process of the ejector pin ejecting the material head from the flow channel.
[0009] Furthermore, the anti-detachment mechanism includes a slot, which is located at the top of the ejector pin and matches the feed head.
[0010] Furthermore, the anti-detachment mechanism includes a limiting post located at the edge of the slot.
[0011] Furthermore, the opening of the slot gradually increases in the direction away from the ejector pin.
[0012] Furthermore, the slot is located at the corner of the flow channel.
[0013] Furthermore, the corner is an L-shaped structure or a T-shaped structure, and the cross-section of the slot is a straight structure, an L-shaped structure, or a T-shaped structure.
[0014] Furthermore, the anti-detachment mechanism includes a wedge-shaped post, which is disposed at the top of the ejector pin and matches the feed head, and the wedge-shaped post gradually decreases in size in the direction away from the ejector pin.
[0015] Furthermore, the ejector pin includes an ejector pin post and a flow channel insert, the flow channel insert being disposed at the top of the ejector pin post, and the anti-detachment mechanism being disposed at the top of the flow channel insert.
[0016] Furthermore, the flow channel insert is provided with a through hole, and the top end of the ejector pin is located inside the through hole.
[0017] This application also provides an injection mold including the runner ejection mechanism as described above, the injection mold having a runner and a cavity communicating with the runner, and the top end of the runner ejection mechanism being located within the runner.
[0018] The beneficial effects of this utility model are as follows: by setting an anti-detachment mechanism at the top of the ejector pin, the anti-detachment mechanism can fix the material head during the process of the ejector pin pushing the material head out of the runner, preventing the material head from slipping due to unbalanced force during ejection. This solves the problem of unbalanced material head ejection in single-sided submarine gates. At the same time, compared with double-sided submarine gates, it does not incur much design cost, but greatly reduces the runner volume, improves the utilization rate of plastic raw materials, and reduces the manufacturing cost of plastic products. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of an injection mold in the prior art.
[0020] Figure 2 This is a schematic diagram of the longitudinal section structure of an injection mold in the prior art.
[0021] Figure 3 This is a schematic diagram of the longitudinal section structure of an injection mold in the prior art when the ejector head is ejected.
[0022] Figure 4 This is a schematic diagram of the structure of an injection mold in the prior art.
[0023] Figure 5 This is a schematic diagram of the longitudinal section structure of the injection mold in the prior art.
[0024] Figure 6 This is a schematic diagram of the longitudinal section structure of the injection mold in the prior art when the ejector head is ejected.
[0025] Figure 7 This is a schematic diagram of the flow channel ejection mechanism, the material head, and the product in Embodiment 1 of this utility model.
[0026] Figure 8 yes Figure 7 A magnified structural diagram of point A in the middle.
[0027] Figure 9 This is a partial structural schematic diagram of the flow channel ejection mechanism in Embodiment 1 of this utility model.
[0028] Figure 10 This is a schematic diagram of the longitudinal section structure of the injection mold in Embodiment 1 of this utility model.
[0029] Figure 11 This is a schematic diagram of the longitudinal section structure of the injection mold in Embodiment 1 of this utility model when the ejector head is ejected.
[0030] Figure 12 This is a schematic diagram of the flow channel ejection mechanism, the material head, and the product in Embodiment 2 of this utility model.
[0031] Figure 13 yes Figure 12A magnified structural diagram at point B in the middle.
[0032] Figure 14 This is a partial structural schematic diagram of the flow channel ejection mechanism in Embodiment 2 of this utility model.
[0033] Figure 15 This is a schematic diagram of the longitudinal section structure of the injection mold in Embodiment 2 of this utility model.
[0034] Figure 16 This is a schematic diagram of the longitudinal section structure of the injection mold in Embodiment 2 of this utility model when the ejector head is ejected.
[0035] Figure 17 This is a schematic diagram of the flow channel ejection mechanism, the material head, and the product in Embodiment 3 of this utility model.
[0036] Figure 18 yes Figure 17 A magnified structural diagram at point C.
[0037] Figure 19 This is a partial structural schematic diagram of the flow channel ejection mechanism in Embodiment 3 of this utility model.
[0038] Figure 20 This is a schematic diagram of the longitudinal section structure of the injection mold in Embodiment 3 of this utility model.
[0039] Figure 21 This is a schematic diagram of the longitudinal section structure of the injection mold in Embodiment 3 of this utility model when the ejector head is ejected.
[0040] In the diagram: 1. Injection mold; 2. Ejector pin; 201. Ejector pin post; 202. Runner insert; 21. Slot; 22. Limiting post; 24. Wedge post; 3. Material head; 4. Product. Detailed Implementation
[0041] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following detailed description, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation methods, structures, features, and effects of the runner ejection mechanism and injection mold proposed according to this utility model:
[0042] [Example 1]
[0043] Figure 7 This is a schematic diagram of the flow channel ejection mechanism, the material head, and the product in Embodiment 1 of this utility model. Figure 8 yes Figure 7 A magnified structural diagram of point A in the middle. Figure 9 This is a partial structural schematic diagram of the flow channel ejection mechanism in Embodiment 1 of this utility model. Figure 10 This is a schematic diagram of the longitudinal section structure of the injection mold in Embodiment 1 of this utility model. Figure 11This is a schematic diagram of the longitudinal section structure of the injection mold in Embodiment 1 of this utility model when the ejector head is ejected.
[0044] like Figures 7 to 11 As shown, the first embodiment of this utility model provides a flow channel ejection mechanism, including ejector pin 2 and anti-detachment mechanism. The anti-detachment mechanism is located at the top of ejector pin 2. During the process of ejector pin 2 ejecting material head 3 from the flow channel, the anti-detachment mechanism is used to prevent ejector pin 2 from detaching from material head 3.
[0045] This invention solves the problem of uneven ejection of the sprue head in a single-sided submarine gate by setting an anti-detachment mechanism at the top of the ejector pin 2. This mechanism can fix the sprue head 3 in place during the ejection process of the ejector pin 2 pushing the sprue head 3 out of the flow channel, preventing the sprue head 3 from slipping due to uneven force during ejection. At the same time, compared with a double-sided submarine gate, it does not incur much design cost, but greatly reduces the flow channel volume, improves the utilization rate of plastic raw materials, and reduces the manufacturing cost of plastic products.
[0046] In this embodiment, the anti-detachment mechanism includes a slot 21, which is located at the top of the ejector pin 2 and mates with the material head 3. Furthermore, the anti-detachment mechanism includes a limiting post 22, which is located at the edge of the slot 21. During the process of the ejector pin 2 ejecting the material head 3 from the flow channel, the ejector pin 2 holds the material head 3 in place through the slot 21, and the limiting post 22, located at the edge of the material head 3, restricts the material head 3 within the slot 21, thereby fixing the material head 3 and preventing it from slipping due to unbalanced force during ejection.
[0047] Furthermore, the opening of the slot 21 gradually increases in the direction away from the ejector pin 2, and the greater the ejection force of the ejector pin 2, the tighter the material head 3 is locked with the slot 21, so that the slot 21 can better lock the material head 3.
[0048] Furthermore, the slot 21 is located at the corner of the flow channel, that is, the slot 21 is set at the corner of the material head 3. In this embodiment, the corner is an L-shaped structure, and the cross-section of the slot 21 is a straight structure. By placing the slot 21 at the corner of the flow channel, the limiting post 22 can better cooperate with the corner of the material head 3, preventing the material head 3 from slipping due to unbalanced force when it is ejected.
[0049] In this embodiment, there are three ejector pins 2 and anti-detachment mechanisms. Each ejector pin 2 is provided with an anti-detachment mechanism at its top. There are two corners in both the flow channel and the material head 3. Two ejector pins 2 and anti-detachment mechanisms are located at the corners of the flow channel and the material head 3, and the other ejector pin 2 and anti-detachment mechanism is located in the middle of the flow channel and the material head 3.
[0050] This application also provides an injection mold 1, including the runner ejection mechanism as described above. The injection mold 1 has a runner and a cavity communicating with the runner, and the top end of the runner ejection mechanism is located inside the runner. Specifically, the runner, the cavity, and the runner ejection mechanism are disposed on the core of the injection mold 1. After the injection molding machine injects molten plastic into the injection mold, the plastic in the runner forms the sprue 3, while the plastic in the cavity forms the product 4.
[0051] [Example 2]
[0052] Figure 12 This is a schematic diagram of the flow channel ejection mechanism, the material head, and the product in Embodiment 2 of this utility model. Figure 13 yes Figure 12 A magnified structural diagram at point B in the middle. Figure 14 This is a partial structural schematic diagram of the flow channel ejection mechanism in Embodiment 2 of this utility model. Figure 15 This is a schematic diagram of the longitudinal section structure of the injection mold in Embodiment 2 of this utility model. Figure 16 This is a schematic diagram of the longitudinal section structure of the injection mold at the ejector head in Embodiment 2 of this utility model. Figures 12 to 16 As shown, the flow channel ejection mechanism and injection mold provided in Embodiment 2 of this utility model are the same as those in Embodiment 1. Figures 7 to 11 The ejection mechanism and injection mold in the ) are basically the same, the difference is:
[0053] In this embodiment, the ejector pin 2 includes an ejector pin post 201 and a runner insert 202. The runner insert 202 is disposed at the top end of the ejector pin post 201, and an anti-detachment mechanism is disposed at the top end of the runner insert 202. The ejector pin post 201 and the runner insert 202 can slide relative to each other, and the runner insert 202 can slide on the injection mold 1. Specifically, the runner insert 202 has a through hole, the top end of the ejector pin post 201 is disposed in the through hole, and the top end of the ejector pin post 201 can slide in the through hole and extend out from one end of the through hole. During the process of ejecting the material head 3 from the flow channel by ejector pin 2, the flow channel insert 202 moves together with ejector pin 201. The flow channel insert 202 fixes the material head 3 to prevent it from moving or slipping during ejection, so that the material head 3 can be broken off. After the flow channel insert 202 is in place, ejector pin 201 continues to eject and extends from one end of the through hole, and ejects the material head 3 from the flow channel insert 202.
[0054] Furthermore, the slot 21 is located at the corner of the flow channel, that is, at the corner of the material head 3. In this embodiment, the corner is L-shaped, and the cross-section of the slot 21 is also L-shaped. Placing the slot 21 at the corner of the flow channel allows the limiting post 22 to better engage with the corner of the material head 3, preventing the material head 3 from slipping due to unbalanced forces during ejection. Of course, the corner of the flow channel can also be T-shaped, and the cross-section of the slot 21 can also be T-shaped, thus better engaging with the corner of the material head 3 and preventing the material head 3 from shifting or slipping during ejection.
[0055] In this embodiment, there are three ejector pins 2 and anti-detachment mechanisms. Each ejector pin 2 has an anti-detachment mechanism at its top. There are two corners in both the flow channel and the material head 3. Two ejector pins 2 and anti-detachment mechanisms are located at the corners of the flow channel and the material head 3, and the other ejector pin 2 and anti-detachment mechanism is located in the middle of the flow channel and the material head 3. The ejector pin 2 located at the corner of the flow channel and the material head 3 has a flow channel insert 202. The slot 21 located at the corner of the flow channel and the material head 3 has an L-shaped cross-section, while the slot 21 located in the middle of the flow channel and the material head 3 has a straight cross-section.
[0056] Those skilled in the art should understand that the remaining structures and working principles of this embodiment are the same as those of Embodiment 1, and will not be repeated here.
[0057] [Example 3]
[0058] Figure 17 This is a schematic diagram of the flow channel ejection mechanism, the material head, and the product in Embodiment 3 of this utility model. Figure 18 yes Figure 17 A magnified structural diagram at point C. Figure 19 This is a partial structural schematic diagram of the flow channel ejection mechanism in Embodiment 3 of this utility model. Figure 20 This is a schematic diagram of the longitudinal section structure of the injection mold in Embodiment 3 of this utility model. Figure 21 This is a schematic diagram of the longitudinal section structure of the injection mold at the ejector head in Embodiment 3 of this utility model. Figures 17 to 21 As shown, the flow channel ejection mechanism and injection mold provided in Embodiment 3 of this utility model are the same as those in Embodiment 1. Figures 7 to 11 Example 2 Figures 12 to 16 The ejection mechanism and injection mold in the ) are basically the same, the difference is:
[0059] In this embodiment, the anti-detachment mechanism includes a wedge-shaped post 24, which is located at the top of the ejector pin 2 and mates with the sprue head 3. The wedge-shaped post 24 gradually decreases in size as it moves away from the ejector pin 2. The wedge-shaped post 24 is inserted into the runner, allowing it to be inserted into and mate with the sprue head 3 after injection molding. During the ejector pin 2's process of pushing the sprue head 3 out of the runner, the wedge-shaped post 24 effectively secures the sprue head 3. After the sprue head 3 is ejected, the wedge-shaped structure facilitates its removal from the wedge-shaped post 24.
[0060] Those skilled in the art should understand that the remaining structures and working principles of this embodiment are the same as those of Embodiment 1 and Embodiment 2, and will not be repeated here.
[0061] In this document, the directional terms such as up, down, left, right, front, and back are defined according to the position of the structures in the accompanying drawings and the relative positions of the structures, and are only used for clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second," etc., used herein are only used for distinction in name and are not used to limit the number or order.
[0062] 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 without departing from the scope of the technical solution of the present utility model. These are equivalent embodiments with equivalent changes. 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 technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.
Claims
1. A flow channel ejection mechanism, characterized in that, It includes a ejector pin (2) and an anti-detachment mechanism. The anti-detachment mechanism is located at the top of the ejector pin (2). During the process of the ejector pin (2) ejecting the material head (3) out of the flow channel, the anti-detachment mechanism is used to prevent the ejector pin (2) from detaching from the material head (3).
2. The flow channel ejection mechanism according to claim 1, characterized in that, The anti-detachment mechanism includes a slot (21), which is located at the top of the ejector pin (2) and matches the feed head (3).
3. The flow channel ejection mechanism according to claim 2, characterized in that, The anti-detachment mechanism includes a limiting post (22), which is located at the edge of the slot (21).
4. The flow channel ejection mechanism according to claim 2, characterized in that, The opening of the slot (21) gradually increases in the direction away from the ejector pin (2).
5. The flow channel ejection mechanism according to claim 2, characterized in that, The slot (21) is located at the corner of the flow channel.
6. The flow channel ejection mechanism according to claim 5, characterized in that, The corner is an L-shaped structure or a T-shaped structure, and the cross-section of the slot (21) is a straight structure, an L-shaped structure or a T-shaped structure.
7. The flow channel ejection mechanism according to claim 1, characterized in that, The anti-detachment mechanism includes a wedge-shaped column (24), which is located at the top of the ejector pin (2) and matches the material head (3). The wedge-shaped column (24) gradually decreases in size in the direction away from the ejector pin (2).
8. The flow channel ejection mechanism according to any one of claims 1-7, characterized in that, The ejector pin (2) includes an ejector pin post (201) and a flow channel insert (202), the flow channel insert (202) being disposed at the top of the ejector pin post (201), and the anti-detachment mechanism being disposed at the top of the flow channel insert (202).
9. The flow channel ejection mechanism according to claim 8, characterized in that, The flow channel insert (202) is provided with a through hole, and the top end of the ejector pin (201) is located in the through hole.
10. An injection mold, characterized in that, Includes a runner ejection mechanism as described in any one of claims 1-9, wherein the injection mold (1) has a runner and a cavity communicating with the runner, and the top end of the runner ejection mechanism is located within the runner.