Ejector block side core-pulling structure
By incorporating a spring core and spring in the top block, combined with a limiting pin and a straight ejector rod, automatic demolding and individual core pulling of structural holes are achieved, solving the problem of difficult part removal in existing technologies and reducing production costs.
Patent Information
- Application Number
- CN202423177866.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-23
AI Technical Summary
In existing technologies, conventional top blocks and inclined top structures cannot achieve individual core-pulling actions for products, resulting in time-consuming and labor-intensive production processes with high labor costs. This is especially true when products have undercut holes and deep ribs, making part removal difficult.
The design incorporates a built-in spring and a top block, using the spring's thrust to achieve lateral core-pulling motion of the spring core. Combined with a limit pin and a straight push rod, it enables vertical ejection of the product and individual core-pulling of structural holes.
It enables automatic demolding of products, reduces the need for manual part removal, improves production efficiency, and reduces mold and labor costs.
Smart Images
Figure CN223545701U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of automotive injection molds, specifically relating to a top block side core-pulling structure. Background Technology
[0002] For conventional ejector blocks and angled ejector structures in plastic molds, conventional ejector blocks are currently limited to the mold ejection function and cannot perform independent core-pulling actions. Angled ejector blocks, constrained by the product structure, cannot interfere with backward movement. When the product has numerous external features, including holes, slots, undercuts, and deep ribs, the backward movement of angled ejector blocks is restricted by the product structure. After ejection with conventional ejector blocks, manual removal is necessary, but due to the presence of holes and slots (with installation size requirements), the parts are directly attached to the ejector blocks, making removal difficult. This process is time-consuming, labor-intensive, and wastes significant labor costs. Therefore, conventional ejector blocks and angled ejector blocks, limited by product structural features, cannot perform independent core-pulling operations for structural holes. Utility Model Content
[0003] To address the aforementioned problems in the existing technology, this utility model provides a top block side core-pulling structure. The structure is ingenious. By using a spring-loaded core built into the top block and in conjunction with a spring, it is possible to pull the core from the structural hole on one side while the product is being ejected, thus eliminating the need for manual removal and facilitating production.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a top block side core-pulling structure, comprising a top block, a spring core, a limiting pin, a spring, and a straight push rod. The spring core and the spring are disposed in the top block, and the spring is compressed and disposed between the spring core and the top block. The limiting pin passes through the top block and the spring core. The spring core is provided with an oblong hole. The limiting pin passes through the oblong hole and is located at one end of the oblong hole. Under the action of the spring, the spring core slides along the long axis of the oblong hole until the limiting pin is limited by the other end of the oblong hole and stops. The top end of the straight push rod is fixed to the top block.
[0005] Furthermore, the top block has a through hole that matches the spring core, with one side of the spring core passing through the through hole and the spring placed in the through hole.
[0006] Furthermore, the distance by which the core slides along the long axis of the oblong hole is 'a', where 'a' is 2.5 mm.
[0007] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model uses a spring core built into the top block. When the mold top block is ejected vertically, the spring core is pulled laterally under the action of the spring force, so that the spring core is separated from the product by 2.5mm. The product hole groove is undercut by 1mm, and the product hole groove is demolded, so that the product does not need to be manually removed. This utility model not only plays the role of ejection, but also does not stick to the top block. The ejection is balanced and the structure is stable, which will not cause difficulties in removing the product, reduce the risk in the production process, and reduce the cost of molds and procurement costs. Attached Figure Description
[0008] Figure 1 This is a schematic diagram of the product structure of this utility model;
[0009] Figure 2 This is a cross-sectional view of the product of this utility model;
[0010] Figure 3 Schematic diagram of existing sloping roof structure Figure 1 ;
[0011] Figure 4 Schematic diagram of existing sloping roof structure Figure 2 ;
[0012] Figure 5 for Figure 3 Schematic diagram of the structure at point A in the middle;
[0013] Figure 6 for Figure 5 Schematic diagram of the structure at point B;
[0014] Figure 7 This is a schematic diagram of the structure of this utility model;
[0015] Figure 8 This is an exploded view of the present invention;
[0016] Figure 9 This is a schematic diagram of the structure of this utility model during operation;
[0017] Figure 10 This is a cross-sectional view of the present invention during operation;
[0018] Figure 11 This is a cross-sectional view of the product and top block of this utility model during operation. Detailed Implementation
[0019] 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.
[0020] like Figure 1-2 Product 1 has many features and has undercut features and deep ribs in the slot 11. The slot 11 is 1mm wide, so the top block needs to be undercut 1mm in the slot 11.
[0021] like Figure 3-6The existing inclined ejector method will be upside down in the slot 11. However, since the product 1 has many inclined ejectors that cannot move backward, the inclined ejector method cannot be used. If a conventional straight ejector block is used, the straight ejector block will still be upside down in the slot due to the characteristics of the slot 11. After ejection, the part can only be removed manually. However, due to the deep and numerous deep ribs, the product is at high risk of sticking to the mold after ejection, making it difficult to remove the part. This is still time-consuming and labor-intensive in production, resulting in a significant waste of labor costs.
[0022] Please see Figure 7-11 The present invention provides the following technical solution: a top block side core-pulling structure, including a top block 2, a spring core 3, a limiting pin 4, a spring 5, and a straight push rod 6. The spring core 3 and the spring 5 are disposed in the top block 2. The spring core 3 slides left and right in the top block 2. The spring 5 is compressed and disposed between the spring core 3 and the top block 2. The spring 5 has a pushing force on the spring core 3. The limiting pin 4 passes through the top block 2 and the spring core 3 perpendicular to the movement direction of the spring core 3. The limiting pin 4 is fixed in the top block 2. The spring core 3 is provided with an oblong hole 31. The long axis of the oblong hole 31 is consistent with the movement direction of the spring core 3. The limiting pin 4 passes through the oblong hole 31 and is located at one end of the oblong hole 31. Under the action of the spring 5, the spring core 3 will slide along the long axis of the oblong hole 31 until the limiting pin 4 is limited by the other end of the oblong hole 31 and stops. The top end of the straight push rod 6 is fixed to the top block 2.
[0023] Specifically, the top block 2 has a through hole 21 that matches the shape of the spring core 3. The upper part of the through hole 21 passes through the top block 2, while the lower part does not pass through the top block 2. One side of the spring core 3 passes through the upper part of the through hole 21, and the side of the spring core 3 that passes through the through hole 21 is inserted into the slot 11 of the product 1. The slot 11 is 1mm wide, and the spring 5 is placed at the lower part of the through hole 21.
[0024] Specifically, the distance that the core 3 slides along the long axis of the oblong hole 31 is a, where a is 2.5mm. Therefore, the core 3 slides laterally under the action of the spring 5. After the core 3 slides 2.5mm, the limiting pin 4 is limited by the other end of the oblong hole 31 on the core 3, preventing the core 3 from continuing to move. The end of the core 3 that is locked into the slot 11 of the product 1 also comes out.
[0025] The installation and movement process of this utility model is as follows: First, fix the top block 2 and the straight push rod 6 together with screws. Then, install the spring 5 into the through hole 21 of the top block 2, and then install the spring core 3 into the through hole of the top block 2. At this time, the spring core 3 compresses the spring. Then, insert the limiting pin 4 into the top block 2. At this time, the limiting pin 4 also passes through the oval hole 31 on the spring core 3 and is located at one end of the oval hole 31. Then, install the top block side core pulling structure into the mold together, and the assembly is complete. At this time, the top surface of the top block 2 contacts the deep rib part of the product 1, and one end of the spring core 3 is snapped into the hole groove 11 of the product 1 with a backing amount of 1mm. When the mold is ejected, the spring core 3 slides laterally under the push of the spring 5. After the spring core 3 slides 2.5mm, the limit pin 4 is limited by the other end of the oval hole 31 on the spring core 3 to prevent the spring core 3 from continuing to move. The end of the spring core 3 that is locked into the groove 11 of the product 1 comes out, and at the same time the product 1 is also ejected vertically upward. In this way, the product 1 is ejected while the individual core-pulling movement of the structural hole is completed.
[0026] When product 1 has many appearances, and some parts are restricted by the product structure from being designed with sloping tops, and the product has undercut features of holes and grooves 11 and deep ribs, this utility model can solve the problems of demolding and core pulling of product 1 and sticking to the top block 2. It also eliminates the need for manual removal of parts, avoids the waste of labor costs in subsequent production, and avoids the expensive costs of mold modification in the later stage.
[0027] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A top-block side core-pulling structure, characterized in that, The device includes a top block (2), a spring core (3), a limiting pin (4), a spring (5), and a straight push rod (6). The spring core (3) and the spring (5) are disposed in the top block (2). The spring (5) is compressed between the spring core (3) and the top block (2). The limiting pin (4) passes through the top block (2) and the spring core (3). The spring core (3) is provided with an oblong hole (31). The limiting pin (4) passes through the oblong hole (31) and is located at one end of the oblong hole (31). Under the action of the spring (5), the spring core (3) slides along the long axis of the oblong hole (31) until the limiting pin (4) is limited by the other end of the oblong hole (31) and stops. The top end of the straight push rod (6) is fixed to the top block (2).
2. The top block side core-pulling structure according to claim 1, characterized in that, The top block (2) has a through hole (21) that is compatible with the spring core (3). One side of the spring core (3) passes through the through hole (21), and the spring (5) is placed in the through hole (21).
3. The top block side core-pulling structure according to claim 2, characterized in that, The distance by which the spring core (3) slides along the long axis of the oblong hole (31) is a, where a is 2.5 mm.