Post-suction insert sprue structure

Abstract

The utility model discloses a rear suction insert sprue structure, and relates to the technical field of injection molding. Comprising a rear mold plate, rear mold cores are uniformly arranged and embedded in an inner cavity of the rear mold plate, rear suction inserts are embedded in the middles of the rear mold cores, a plurality of rear suction driving type pitched roofs which are uniformly distributed are longitudinally and obliquely arranged on the peripheries of the rear suction inserts in a sliding mode, a bearing plate is arranged at the bottom of the rear mold plate, the rear mold plate and the bearing plate are arranged in a relative movement mode, and the rear suction inserts and the bearing plate are fixedly arranged. A fixing block is fixedly arranged at the bottom of the rear suction core, and the rear mold plate is fixedly connected with the fixing block. The die cavity part placing space is greatly reduced, smaller plastic part product forming can be achieved, the die repairing frequency, the spare part number and the die repairing cost of the die can be reduced, the linkage structure of the suction insert and the rear suction drive type inclined top can ensure that the rear suction drive type inclined top and the horn gate can stably coexist, thin iron or structural risks are not generated, and the die quality is improved. The mold can be smoothly demolded, reasonable and stable sprue arrangement can be guaranteed, the production efficiency is improved, and the product quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to a post-injection sub-gate structure. Background Technology

[0002] In the electronics industry, for small, thin-shell plastic parts with snap-fit ​​designs around the inner perimeter, the conventional mold design involves placing a series of angled ejectors to eject the product, with the sprue automatically breaking off. However, the size of the product limits the mold structure layout, leaving insufficient space to accommodate the angled ejectors and sprue inserts. Currently, the thinnest angled ejectors can be made as 2x2mm, but this carries the risk of elastic deformation during ejection, a major cause of product sticking to or jamming the ejector. This leads to difficulties in removing the plastic part and a high risk of damage, increasing product costs. To address the ejection deformation problem, one structure effectively solves the aforementioned risks: a rear-pull driven angled ejector. This type of ejector allows for smaller dimensions and a larger angle of movement. However, if a rear-pull structure is used, the sprue insert cannot be placed.

[0003] Therefore, we have made improvements to this by proposing a post-injection sub-gate structure. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a rear-extraction gate structure, which solves the problem that in existing injection molds, the rear-extraction structure occupies mold space, making it impossible to place the gate insert for the plastic part.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a rear-entry gate structure, including a rear template, a rear mold core evenly arranged and fitted inside the cavity of the rear template, a rear-entry gate fitted in the middle of the rear mold core, and a plurality of evenly distributed rear-entry drive type inclined tops longitudinally inclined and sliding around the rear-entry gate.

[0006] The bottom of the rear template is provided with a support plate, the rear template and the support plate are movable relative to each other, the rear insert is fixedly set to the support plate, the bottom of the rear insert is fixedly provided with a fixing block, and the rear template and the fixing block are fixedly connected.

[0007] As a preferred embodiment, four evenly distributed guide posts are fixedly installed around the perimeter of the bearing plate, and the rear template is slidably installed through the guide posts.

[0008] As a preferred embodiment, the lower part of the bearing plate is provided with a primary ejector pin fixing plate, and springs are symmetrically fixed at the four corners between the primary ejector pin fixing plate and the bearing plate. A primary ejector base plate is fixedly provided at the lower part of the primary ejector pin fixing plate.

[0009] As a preferred embodiment, the bottom of the primary ejection base plate is provided with a secondary ejection fixing plate, and the bottom of the secondary ejection fixing plate is fixedly provided with the secondary ejection base plate.

[0010] As a preferred embodiment, the bottom of the secondary ejection plate is provided with a tertiary ejection plate, and the lower part of the tertiary ejection plate is provided with a lower fixing plate.

[0011] As a preferred embodiment, the bottom of the guide post is fixedly connected to the lower fixing plate, and the guide post is slidably connected through the primary ejector fixing plate, the primary ejector base plate, the secondary ejector fixing plate, the secondary ejector base plate, and the tertiary ejector plate.

[0012] As a preferred embodiment, a sequence controller is provided on one side of the secondary ejection fixing plate and the lower fixing plate. The sequence controller is a standard part in the injection mold and can control the movement of the secondary ejection base plate and the tertiary ejection plate.

[0013] As a preferred embodiment, the upper part of the rear template is provided with multiple material channels communicating with the rear mold core. The material channel located in the middle of the rear template is provided with a flow channel ejector pin. The head of the flow channel ejector pin is located at the bottom of the inner cavity of the material channel, and the head of the flow channel ejector pin is smoothly disposed with the bottom of the inner cavity of the material channel.

[0014] As a preferred embodiment, the end of the flow channel ejector pin is connected through the primary ejector pin fixing plate, and the end of the flow channel ejector pin is pressed and fixed to the primary ejection base plate.

[0015] This utility model has the following beneficial effects:

[0016] It greatly reduces the space required for mold cavity parts, enabling the molding of smaller plastic parts, reducing the number of mold repairs and spare parts, and lowering mold repair costs;

[0017] The linkage structure of the rear-pull-out slant and the rear-pull-driven angled ejector ensures that the rear-pull-driven angled ejector and the horn gate can coexist stably without the risk of thin iron or structural damage. This allows the mold to be demolded smoothly while ensuring a reasonable and stable gate arrangement, thereby improving production efficiency and product quality.

[0018] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a post-injection sub-gate structure according to the present invention;

[0020] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the mid-section line AA;

[0021] Figure 3 This is a schematic cross-sectional view of the ejection action of a post-injection sub-gate structure according to the present invention.

[0022] Figure 4 This is a schematic cross-sectional view of the secondary ejection action of a post-injection sub-gate structure according to the present invention.

[0023] Figure 5 This is a schematic cross-sectional view of the three-stage ejection action of a post-injection sub-gate structure according to the present invention.

[0024] Figure 6 This is a schematic diagram of the assembly structure of the rear-injector and the rear-injector drive type inclined top of the rear-injector gate structure of this utility model.

[0025] In the diagram, 1. Injection molded product; 2. Rear mold core; 3. Runner ejector pin; 4. Rear ejector; 5. Rear ejector driven angled ejector; 6. Rear mold plate; 7. Support plate; 8. Primary ejector pin fixing plate; 9. Primary ejection base plate; 10. Secondary ejection fixing plate; 11. Secondary ejection base plate; 12. Tertiary ejection plate; 13. Sequence controller; 14. Lower fixing plate; 15. Material rake; 16. Guide pillar; 17. Spring; 18. Fixing block. Detailed Implementation

[0026] 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.

[0027] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements 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.

[0028] Please refer to the examples. Figures 1 to 6 This utility model provides a technical solution: a rear-entry sub-gate structure, including a rear template 6, a rear mold core 2 uniformly arranged and fitted inside the cavity of the rear template 6, a rear-entry sub-gate 4 fitted in the middle of the rear mold core 2, and a plurality of uniformly distributed rear-entry driving inclined ejectors 5 longitudinally inclined and sliding around the rear-entry sub-gate 4. The rear mold core 2, the rear-entry sub-gate 4 and the rear-entry driving inclined ejectors 5 cooperate to injection mold the injection product 1, and the rear-entry sub-gate 4 and the rear-entry driving inclined ejectors 5 cooperate to eject the injection product 1 out of the rear mold core 2.

[0029] The bottom of the rear template 6 is provided with a support plate 7. The rear template 6 and the support plate 7 are movable relative to each other. The rear pull-in 4 is fixedly set with the support plate 7. The bottom of the rear pull-in 4 is fixedly provided with a fixing block 18. The rear template 6 is fixedly connected with the fixing block 18.

[0030] The bearing plate 7 is fixedly provided with four evenly distributed guide posts 16 around its perimeter, and the rear template 6 is slidably disposed through the guide posts 16.

[0031] The lower part of the support plate 7 is provided with a primary ejector pin fixing plate 8. Springs 17 are symmetrically fixed at the four corners between the primary ejector pin fixing plate 8 and the support plate 7. The upper end of the spring 17 is inserted through the support plate 7. The upper end of the spring 17 is elastically connected to the rear template 6. The lower part of the primary ejector pin fixing plate 8 is fixed with a primary ejector base plate 9.

[0032] The bottom of the primary ejection base plate 9 is provided with a secondary ejection fixing plate 10, and the bottom of the secondary ejection fixing plate 10 is fixedly provided with a secondary ejection base plate 11.

[0033] The bottom of the secondary ejection base plate 11 is provided with a tertiary ejection plate 12, and the lower part of the tertiary ejection plate 12 is provided with a lower fixing plate 14.

[0034] The bottom of the guide post 16 is fixedly connected to the lower fixing plate 14, and the guide post 16 is slidably connected through the primary ejector fixing plate 8, the primary ejector base plate 9, the secondary ejector fixing plate 10, the secondary ejector base plate 11, and the tertiary ejector plate 12.

[0035] A sequence controller 13 is provided on one side of the secondary ejection fixing plate 10 and the lower fixing plate 14. The sequence controller 13 is a standard part in the injection mold and can control the movement of the secondary ejection base plate 11 and the tertiary ejection plate 12.

[0036] The upper part of the rear template 6 is provided with multiple material channels that communicate with the rear mold core 2. The material channel located in the middle of the rear template 6 is provided with a flow channel ejector pin 3. The head of the flow channel ejector pin 3 is located at the bottom of the inner cavity of the material channel, and the head of the flow channel ejector pin 3 is smoothly disposed with the bottom of the inner cavity of the material channel.

[0037] The end of the flow channel ejector pin 3 is connected through the primary ejector pin fixing plate 8, and the end of the flow channel ejector pin 3 is pressed and fixed to the primary ejector base plate 9.

[0038] After injection molding, the material channel produces a material rake 15, which is connected to the injection molded product 1. The flow channel ejector pin 3 is used to eject the material rake 15.

[0039] The working principle of this utility model:

[0040] The complete injection mold is placed into the injection molding machine. During the ejection process of the injection molding machine, the sequence controller 13 controls the first ejection plate 9 to move first, and controls the flow channel ejector pin 3 to eject the material rake 15, so that the material rake 15 is disengaged and then pulled into the insert 4.

[0041] Then, the secondary ejection plate 11 and the tertiary ejection plate 12 start to move together. The spring 17 elastically squeezes the rear template 6, causing the rear template 6 to separate from the support plate 7. During the process of the rear template 6 separating from the support plate 7, the rear pull-driven inclined ejector 5 moves with the rear template 6. The fixed setting of the rear pull-in 4 and the support plate 7 makes the rear pull-driven inclined ejector 5 placed on the upper part of the rear pull-in 4, so that the injection molded product 1 separates from the rear pull-in 4 under the ejection action of the rear pull-driven inclined ejector 5.

[0042] Then the ejector plates stop three times, causing the rear-pull-driven inclined ejector 5 to stop moving. The first ejector plate 9 and the second ejector plate 12 continue to move, causing the runner ejector pin 3 to completely withdraw the injection product 1 and the material rake 15 from the rear mold core 2, thus completing the three ejection actions.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A post-injection sub-gate structure, characterized in that: Includes a rear template (6), the inner cavity of the rear template (6) is uniformly fitted with a rear mold core (2), the middle of the rear mold core (2) is fitted with a rear insert (4), and the rear insert (4) is longitudinally inclined and slidably provided with multiple uniformly distributed rear-pull drive type inclined tops (5) around its perimeter. The bottom of the rear template (6) is provided with a support plate (7). The rear template (6) and the support plate (7) are moved relative to each other. The rear insert (4) is fixedly installed with the support plate (7). The bottom of the rear insert (4) is fixedly provided with a fixing block (18). The rear template (6) and the fixing block (18) are fixedly connected.

2. The post-injection sub-gate structure according to claim 1, characterized in that: The support plate (7) is fixedly provided with four evenly distributed guide posts (16) around its perimeter, and the rear template (6) is slidably connected to the guide posts (16).

3. The post-injection sub-gate structure according to claim 2, characterized in that: The lower part of the bearing plate (7) is provided with a primary ejector pin fixing plate (8), and springs (17) are symmetrically fixed at the four corners between the primary ejector pin fixing plate (8) and the bearing plate (7). The lower part of the primary ejector pin fixing plate (8) is provided with a primary ejector base plate (9).

4. The post-injection sub-gate structure according to claim 3, characterized in that: The bottom of the primary ejection base plate (9) is provided with a secondary ejection fixing plate (10), and the bottom of the secondary ejection fixing plate (10) is fixedly provided with a secondary ejection base plate (11).

5. The post-injection sub-gate structure according to claim 4, characterized in that: The bottom of the secondary ejection base plate (11) is provided with a tertiary ejection plate (12), and the lower part of the tertiary ejection plate (12) is provided with a lower fixing plate (14).

6. The post-injection sub-gate structure according to claim 5, characterized in that: The bottom of the guide post (16) is fixedly connected to the lower fixing plate (14), and the guide post (16) is slidably connected to the primary ejector fixing plate (8), the primary ejector base plate (9), the secondary ejector fixing plate (10), the secondary ejector base plate (11), and the tertiary ejector plate (12).

7. The post-injection sub-gate structure according to claim 5, characterized in that: The secondary ejection fixing plate (10) and the lower fixing plate (14) are provided with a sequence controller (13) on one side. The sequence controller (13) is a standard part in the injection mold. The sequence controller (13) can control the movement of the secondary ejection base plate (11) and the tertiary ejection plate (12).

8. The post-injection sub-gate structure according to claim 1, characterized in that: The upper part of the rear template (6) is provided with multiple material channels that communicate with the rear mold core (2). The material channel located in the middle of the rear template (6) is provided with a flow channel ejector pin (3). The head of the flow channel ejector pin (3) is located at the bottom of the inner cavity of the material channel, and the head of the flow channel ejector pin (3) is smoothly arranged with the bottom of the inner cavity of the material channel.

9. A post-injection sub-gate structure according to claim 8, characterized in that: The end of the flow channel ejector pin (3) is connected through the primary ejector pin fixing plate (8), and the end of the flow channel ejector pin (3) is pressed and fixed to the primary ejector base plate (9).

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