Encapsulated product triple ejection structure

Abstract

The utility model discloses a kind of three times ejection structure of rubber-coated product, comprising: back mould, first straight top component, second straight top component, primary push block and secondary push block, limiting assembly;The primary push block is set on back mould, and is connected with back mould by limiting assembly, wherein limiting assembly is used to limit the primary push block ejection distance;The secondary push block is arranged on the primary push block, and the top of the secondary push block is provided with the die core integrally formed with the secondary push block;One end of the first straight top component sequentially passes through the end angle of back mould, primary push block and die core;One end of the second straight top component sequentially passes through back mould, primary push block and is placed in the end angle of die core.

Description

Technical Field

[0001] This utility model relates to the field of overcoated products technology, and in particular to a three-stage ejection structure for overcoated products. Background Technology

[0002] In plastic product molding processes, overmolding (i.e., secondary injection molding of hard plastic onto soft plastic) is widely used in consumer electronics, automotive parts, and other fields. This process enables the overmolding of soft plastic onto a hard plastic substrate, thereby improving the product's protective properties, sealing, and user experience.

[0003] However, in actual production, overmolded products often have complex geometric structures, such as the soft rubber button area on the camera hole side and the triangular undercut areas at the corners of the product. The undercut depth in these areas can reach 3.5mm to 4.5mm, resulting in a strong clamping force between the product and the mold after molding. Current technologies generally use single or double ejection to complete demolding, but these methods have the following drawbacks: 1. Difficulty in demolding undercut areas: When the undercut is deep, a single ejection often cannot completely release the clamping force, resulting in damage or scrap when the product is forcibly demolded.

[0004] 2. Inappropriate ejection sequence: Although the traditional two-stage ejection scheme can partially alleviate the demolding problem, it still cannot effectively solve the ejection problem in deep undercut areas (such as the button positions around the camera hole).

[0005] 3. Insufficient ejection accuracy: Some molds lack limit and guide designs, which can easily lead to deviation or unstable ejection volume during the ejection process, causing product deformation or even damage.

[0006] 4. Limited mold life and yield: Frequent uneven ejection or product jamming not only affects the product yield, but also causes uneven stress on the mold, accelerates wear, and shortens its service life. Utility Model Content

[0007] To address the problems existing in the prior art, this utility model provides a three-stage ejection structure for overmolded products.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows: This utility model provides a three-stage ejection structure for overmolded products, including: a rear mold, a first direct ejection assembly, a second direct ejection assembly, a first ejector block, a second ejector block, and a limiting assembly; The primary ejector block is mounted on the rear mold and connected to the rear mold via a limiting component, wherein the limiting component is used to limit the ejection distance of the primary ejector block; The secondary push block is arranged on the primary push block, and the top of the secondary push block is provided with a mold core integrally formed with the secondary push block; One end of the first direct ejector component passes sequentially through the rear mold, the primary ejector block, and the end corner of the mold core; One end of the second straight push assembly passes through the rear mold and the first push block in sequence and is placed at the end corner of the mold core.

[0009] Preferably, the limiting component includes a limiting screw, one end of which is fixed to the rear mold, and the other end extends into the limiting hole of the primary push block. The ejection distance of the primary push block is limited by the combination of the length of the screw rod and the depth of the limiting hole.

[0010] Preferably, the number of the first straight-top components is three, each corresponding to one of the three triangular inverted areas of the overmolded product, and the number of the second straight-top components is one, corresponding to the inverted area of ​​the soft rubber button on the camera hole side of the overmolded product.

[0011] Preferably, the first straight push assembly includes a first straight push rod; the top two sides of the first straight push rod extend outwards. The second straight push assembly includes a second straight push rod and a top block disposed on the top of the second straight push rod.

[0012] Preferably, the ends of the first and second straight ejector rods furthest from the mold core are both connected to an external ejection drive component, which is a cylinder or a hydraulic cylinder.

[0013] Preferably, a guide structure is provided between the primary ejector block and the rear mold, the guide structure including guide grooves respectively formed on the primary ejector block and the rear mold, and guide blocks adapted to the guide grooves.

[0014] Preferably, positioning blocks are also installed on the four sides of the rear mold, and the top of the positioning blocks is provided with protrusions.

[0015] Preferably, the system further includes a front mold for mating with the rear mold. The bottom of the front mold has a positioning groove that matches the top protrusion of the positioning block. The front mold fits onto the rear mold by engaging with the protrusion through the positioning groove. The technical solution of this utility model has the following beneficial effects: 1. Step-by-step demolding to prevent damage: Through the step-by-step action of the first, second and third ejection, the clamping force of each undercut area of ​​the product is released step by step, avoiding the product from being unable to be demolded smoothly or being damaged due to excessive undercutting.

[0016] 2. Dedicated solution for deep undercut areas: In deep undercut areas such as the soft rubber buttons on the camera hole side, a dedicated second straight push rod and push block are set up to achieve precise ejection and solve problems that traditional structures cannot handle.

[0017] 3. Limiting and guiding to ensure stability: The stroke of the push block is controlled by the limit screw to avoid over- or under-push; at the same time, the cooperation of the guide groove and the guide block ensures the stability of the push block's movement direction, prevents deviation, and improves the ejection accuracy.

[0018] 4. High mold closing and alignment accuracy: Positioning blocks are set around the rear mold and positioning grooves are provided at the bottom of the front mold. The front and rear molds are matched and aligned to achieve precise positioning, avoid mold closing misalignment, and improve product molding quality.

[0019] 5. Improve production efficiency and yield: The multi-stage ejection structure reduces the frictional resistance between the product and the mold during ejection, making demolding smoother and more stable, effectively improving mold life and product yield. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the bottom structure of this utility model; Figure 3 This is a schematic diagram of the explosion of this utility model. Figure 1 ; Figure 4 This is a schematic diagram of the explosion of this utility model. Figure 2 . Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] Reference Figures 1 to 4 This utility model provides a three-stage ejection structure for overmolded products, including a rear mold 1, a first straight ejector assembly 5, a second straight ejector assembly 6, a primary ejector block 2, a secondary ejector block 3, and a limiting assembly 7; wherein, the overmolded product is composed of a hard rubber part and a soft rubber overmolding; the primary ejector block 2 is assembled on the rear mold 1 and forms a connection and cooperation with the rear mold 1 through the limiting assembly 7, the limiting assembly 7 is used to precisely limit the ejection distance of the primary ejector block 2 relative to the rear mold 1, to avoid over-ejection or under-ejection; the purpose of the primary ejection action of the primary ejector block 2 is to separate the undercut structure between the product and the mold through precise initial ejection, thereby initially relieving the clamping force of the product on the mold. This stage of ejection is not a complete demolding, but rather a targeted release of some undercut constraints (such as product edges or shallow undercut areas) to break the rigid fit between the product and the mold, creating favorable conditions for subsequent secondary and tertiary ejections. Through the mechanical limiting effect of the limiting component 7, the ejection distance of the first ejector block 2 is strictly limited within the preset range to avoid deviations in ejection distance caused by fluctuations in external driving force, ensuring the consistency of each ejection action.

[0027] The secondary push block 3 is stacked on top of the primary push block 2. The top of the secondary push block 3 is integrally formed with a mold core 4, which is used to adapt to the inner shape of the overmolded product to achieve positioning and support during product molding. The secondary push block 3's secondary push is mainly for: pushing the peripheral undercuts of the overmolded product (peripheral undercuts are mostly distributed at the junction of soft overmolded and hard plastic parts) away from the primary push block 2, which can further reduce the overall clamping force of the product and clear the resistance for the tertiary push deep undercuts. After the peripheral undercuts are separated from the primary push block 2, the overmolded product is only constrained by the deep undercuts on the camera hole side and the deep undercuts in the triangular area, which can concentrate the driving force during the tertiary push. Acting on the deep undercut area, it does not require overcoming the additional resistance of the surrounding constraints, avoiding the bending and product jamming caused by the superposition of multiple constraints. One end of the first straight ejector component 5 passes through the rear mold 1 and the first ejector block 2 in sequence, and extends to the end corner of the mold core 4, forming a push-fit with the mold core 4 and the overmolded product; there are three first straight ejector components 5, and the three first and third straight ejector components 5 correspond one-to-one with the three triangular undercut areas of the overmolded product, realizing the synchronous push of the triangular undercut areas. The push force is evenly applied to the inner wall of the triangular undercut area, forcibly separating the triangular undercut of the product from the mold core groove, and assisting the product to detach from the mold core as a whole; One end of the second straight ejector component 6 passes through the rear mold 1 and the primary ejector block 2 in sequence, and is positioned at the end corner of the mold core 4 to form an ejector fit with the overmolded product. There is only one second straight ejector component 6. This component corresponds to the undercut area of ​​the soft rubber button on the camera hole side of the overmolded product, specifically addressing the ejection problem in that area.

[0028] Furthermore, the limiting component 7 includes a limiting screw. One end of the limiting screw is fixed to the rear mold 1, and the other end extends into the limiting hole of the primary push block 2. By matching the length of the screw rod with the depth of the limiting hole, the ejection distance of the primary push block is precisely limited, ensuring that the ejection stroke is stable and controllable.

[0029] Furthermore, the first straight push assembly 5 includes a first straight push rod; the top two sides of the first straight push rod extend outwards, and the second straight push assembly 6 includes a second straight push rod and a top block 10 disposed on the top of the second straight push rod; the top two sides of the first straight push rod extend outwards to form an adapter portion, which fits against the inner wall of the triangular undercut area of ​​the rubber-coated product, improving the stability of the force during pushing; the top of the second straight push assembly 6 is integrally formed or fixedly connected with the top block 10, which fits against the end face of the undercut area of ​​the soft rubber button on the camera hole side of the rubber-coated product, ensuring that the pushing force is evenly transmitted.

[0030] Furthermore, the ends of the first and second straight ejector rods furthest from the mold core 4 are both connected to an external ejection drive component. The external ejection drive component is a pneumatic cylinder or a hydraulic cylinder, and the appropriate drive method can be selected according to actual production needs to ensure stable ejection power.

[0031] Furthermore, a guide structure is provided between the primary ejector block 2 and the rear mold 1. The guide structure includes guide grooves respectively opened at the bottom of the primary ejector block and the top of the rear mold, and a guide block 8 that slides and adapts to the guide grooves. Through the cooperation of the guide grooves and the guide block 8, the movement direction of the primary ejector block 2 is restricted, so as to avoid deviation during the ejection process and ensure ejection accuracy.

[0032] Furthermore, positioning blocks 9 are installed on all four outer walls of the rear mold 1. The top of the positioning block 9 is integrally formed with a protrusion. The three-stage ejection structure of the overmolded product also includes a front mold 20 for mating with the rear mold 1. The protrusion is used to form a positioning fit with the front mold 20. The bottom of the front mold 20 is provided with a positioning groove that matches the top protrusion of the positioning block 9. The front mold 20 precisely covers the rear mold 1 through the locking fit between the positioning groove and the protrusion, ensuring the alignment accuracy when the front and rear molds are closed.

[0033] The working principle of this utility model is as follows: The three-stage ejection structure of the overmolded product of this utility model follows a step-by-step release principle from shallow to deep and from overall to local. Its specific working principle is as follows: 1. Mold closing and injection molding The rigid plastic part is inserted into the rear mold by a robotic arm. After the front and rear molds are closed, molten soft plastic material is injected to complete the overmolding process. During the molding process, the product has multiple deep undercut areas, which generate a large clamping force.

[0034] 2. Mold opening and single ejection After the mold opens, the first ejector block 2 moves to lift the entire product. Because the ejection stroke of the first ejector block 2 is limited by the limit screw, its ejection amount only allows the product to partially detach from the mold, releasing some of the undercut clamping force. The purpose of this stage is to initially reduce the tight fit between the product and the mold cavity, creating conditions for subsequent secondary ejection.

[0035] 3. Secondary ejection The secondary push block 3 actuates, pushing the undercut structure around the product to separate from the mold. At this point, the product's clamping force is further weakened, but the deep undercut button area on the camera hole side remains fixed by the push block. The purpose of this stage is to release most of the undercut constraints, leaving only some key local areas unreleased.

[0036] 4. Three ejections Subsequently, the first ejector component 5 acts on the undercut areas at the three corners of the product, while the second ejector component 6 pushes out the undercut area of ​​the soft rubber button on the camera hole side, gradually pushing the deep undercut parts away from the mold. The purpose of this stage is to finally release all undercut clamping forces on the product, achieving complete demolding.

[0037] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A three-stage ejection structure for encapsulated products, characterized in that, include: Rear mold, first direct ejector assembly, second direct ejector assembly, first ejector block, second ejector block, limit assembly; The primary ejector block is mounted on the rear mold and connected to the rear mold via a limiting component, wherein the limiting component is used to limit the ejection distance of the primary ejector block; The secondary push block is arranged on the primary push block, and the top of the secondary push block is provided with a mold core integrally formed with the secondary push block; One end of the first direct ejector component passes sequentially through the rear mold, the primary ejector block, and the end corner of the mold core; One end of the second straight push assembly passes through the rear mold and the first push block in sequence and is placed at the end corner of the mold core.

2. The encapsulated product triple ejection structure of claim 1, wherein, The limiting component includes a limiting screw, one end of which is fixed to the rear mold, and the other end extends into the limiting hole of the primary push block. The ejection distance of the primary push block is limited by the length of the screw rod and the depth of the limiting hole.

3. The encapsulated product triple ejection structure of claim 1, wherein, There are three first direct-top components, each corresponding to one of the three triangular inverted areas of the overmolded product. There is one second direct-top component, corresponding to the inverted area of ​​the soft rubber button on the camera hole side of the overmolded product.

4. The encapsulated product triple ejection structure of claim 3, wherein, The first direct-acting assembly includes a first direct-acting rod; the top two sides of the first direct-acting rod extend outwards. The second straight push assembly includes a second straight push rod and a top block disposed on the top of the second straight push rod.

5. The three-stage ejection structure of the overmolded product according to claim 4, characterized in that, The ends of the first and second straight ejector rods furthest from the mold core are both connected to an external ejection drive component, which is a cylinder or a hydraulic cylinder.

6. The three-stage ejection structure of the overmolded product according to claim 2, characterized in that, A guide structure is provided between the primary ejector block and the rear mold. The guide structure includes guide grooves respectively opened on the primary ejector block and the rear mold, and guide blocks adapted to the guide grooves.

7. The three-stage ejection structure of the overmolded product according to claim 6, characterized in that, The rear mold is also equipped with positioning blocks on its four sides, and the top of the positioning blocks is provided with protrusions.

8. The three-stage ejection structure of the overmolded product according to claim 7, characterized in that, It also includes a front mold for mating with the rear mold, wherein the bottom of the front mold has a positioning groove adapted to the top protrusion of the positioning block, and the front mold covers the rear mold by engaging with the protrusion through the positioning groove.

Images