Ejection structure for realizing demolding through ejection block

Abstract

The utility model discloses an ejection structure for realizing demolding by an ejection block, relates to the technical field of mold opening, and aims to solve the technical problems of motion interference, structure redundancy, low demolding efficiency and insufficient positioning precision. During mold opening, the ejector rod drives the ejector block to axially move along the ejector sleeve body, and the first sliding block and the second sliding block are respectively pushed to slide and demold in the reverse direction perpendicular to the ejection direction through the inclined plane matching of the third inclined plane and the first guide inclined plane and the inclined plane matching of the fourth inclined plane and the second guide inclined plane. And then the ejector block continues to move to eject the formed product out of the injection molding cavity. Through the mirror symmetry layout of the first guide inclined plane and the second guide inclined plane and the matching arrangement of the third inclined plane and the fourth inclined plane on the ejector block, the sliding blocks on the two sides are ensured to synchronously slide and separate in opposite directions during mold opening, and mold clamping stagnation or product damage caused by asynchronous movement is avoided.

Description

Technical Field

[0001] This utility model relates to the field of mold opening technology, and in particular to an ejection structure for demolding by an ejector block. Background Technology

[0002] In the field of injection molds, thin-walled parts, deep-cavity injection molded products, or injection molded products with undercut structures often require a structure in which the slider and ejection mechanism work together for demolding.

[0003] Traditional demolding methods typically have the following problems:

[0004] Motion interference risk: The slider and ejection mechanism use independent drive sources (such as cylinders, angled ejectors, etc.), and the poor coordination of multiple power units can easily lead to asynchronous slider movement, causing product damage or mold wear.

[0005] Structural complexity: In order to achieve undercut demolding, additional components such as inclined ejector pins or hydraulic cylinders are required, resulting in a large mold size, high assembly precision requirements, and increased maintenance costs;

[0006] Low demolding efficiency: The ejection action and the separation of the slider need to be performed in steps, resulting in a long demolding stroke and extended cycle, which affects production efficiency;

[0007] Insufficient positioning accuracy: The lack of precise guidance between the ejector sleeve and the ejection mechanism makes it easy for the product to wobble during the ejection process, resulting in whitening or deformation on the product surface.

[0008] To address the aforementioned issues, there is an urgent need for an integrated ejection structure with high coordination of actions to simplify mold design and improve demolding reliability. Summary of the Invention

[0009] The present invention provides an ejection structure for demolding by a top block, which at least solves the technical problems of motion interference, structural redundancy, low demolding efficiency and insufficient positioning accuracy that exist when multiple components work together to demold.

[0010] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:

[0011] An ejection structure for demolding via a top block includes:

[0012] A first mold and a second mold are arranged opposite each other in the mold-closed state. The first mold has a plurality of first injection grooves arranged along the parting surface on its inner side. The second mold has a second injection groove corresponding to the first injection grooves on its inner side. The first injection grooves and the second injection grooves form an injection cavity when the mold is closed.

[0013] A first slider is provided on the inner side of both ends of the first mold, and a first guide slope is provided on the side of the first slider facing the parting surface;

[0014] The second slider is located on the inner side of both ends of the second mold, and the side of the second slider facing the parting surface has a second guide slope that is mirror-symmetrical to the first guide slope.

[0015] Multiple ejector assemblies penetrating the injection molding cavity, each ejector assembly including an ejector body coaxially arranged and an insert rod at one end thereof, the insert rod extending into the injection molding cavity to form a product positioning part, and the outer wall of the insert rod forming a product molding space between the injection molding cavity and the injection molding cavity;

[0016] The ejection mechanism located at the parting line includes:

[0017] The top block, which slides in conjunction with all the sleeve bodies, has a third inclined surface that matches the first guide inclined surface and a fourth inclined surface that matches the second guide inclined surface on its top two sides respectively. The top block has a guide hole along its axis that matches the outer diameter of the sleeve body.

[0018] A push rod that drives the top block to move axially along the sleeve body;

[0019] When the mold is opened, the ejector rod drives the ejector block to move along the axial direction of the ejector body. Through the cooperation of the third inclined surface with the first guide inclined surface and the fourth inclined surface with the second guide inclined surface, the first slider and the second slider are pushed to slide and demold in the opposite direction perpendicular to the ejection direction. Then the ejector block continues to move to eject the molded product out of the injection cavity.

[0020] The beneficial effect is that the ejector block provided in this embodiment of the invention achieves a demolding ejection structure.

[0021] Synchronous demolding and anti-interference design: Through the mirror symmetrical layout of the first guide slope and the second guide slope, and the matching setting of the third slope and the fourth slope on the top block, it is ensured that the sliders on both sides slide and separate synchronously in opposite directions when the mold is opened, avoiding mold jamming or product damage caused by asynchronous movement.

[0022] Structural integration and lightweighting: The top block and the ejector sleeve assembly are slidably fitted through guide holes, and the top block is integrated as a unified power transmission source, replacing the traditional multi-drive unit design, which greatly simplifies the mold structure, reduces manufacturing costs, and reduces the overall volume of the mold.

[0023] Precise demolding in stages: The top block moves in two steps under the drive of the top block:

[0024] Phase 1: The inclined plane is used to push the slider away from the undercut area of ​​the product, achieving initial demolding;

[0025] Second stage: The ejector block continues to move, ejecting the product out of the cavity, forming a continuous and efficient demolding sequence, shortening the molding cycle.

[0026] Improved positioning accuracy and stability: The precise fit between the outer wall of the ejector sleeve and the guide hole, as well as the radial positioning of the insert rod in the injection cavity, effectively suppress the radial offset of the ejector sleeve during ejection, preventing product whitening or deformation, and is especially suitable for high-precision thin-walled part molding.

[0027] Furthermore, the third inclined surface is arranged parallel to the first guide inclined surface, and the fourth inclined surface is arranged parallel to the second guide inclined surface.

[0028] Furthermore, the push rod is connected to the linear motion module. Attached Figure Description

[0029] Figure 1 This is an isometric view of an embodiment of the present utility model;

[0030] Figure 2 This is a partial exploded view of an embodiment of the present invention;

[0031] Figure 3 This is an exploded view of the top block, the first slider, and the second slider according to an embodiment of the present invention;

[0032] Figure 4 This is a cross-sectional view of an embodiment of the present utility model; Detailed Implementation

[0033] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0034] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] 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, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 based on the specific circumstances.

[0037] In this disclosure, unless otherwise stated, directional terms such as "axial," "circumferential," and "radial" generally refer to those defined relative to the axis of rotation of the rotor in the drive motor, and "inner" and "outer" refer to the inner and outer contours of the corresponding components. The terms "first," "second," etc., are used to distinguish different components and do not imply sequentiality or importance. Furthermore, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements.

[0038] This utility model embodiment provides an ejection structure for demolding using a top block, including:

[0039] Please see Figure 1 and Figure 2 In the mold-closed state, a first mold 1 and a second mold 2 are arranged opposite to each other. The inner side of the first mold 1 is provided with a plurality of first injection grooves 11 arranged along the parting surface. The inner side of the second mold 2 is provided with a second injection groove 21 corresponding to the first injection grooves 11. The first injection grooves 11 and the second injection grooves 21 form an injection cavity when the mold is closed.

[0040] Please see Figure 3 and Figure 4 A first slider 3 is provided on the inner side of both ends of the first mold 1, and a first guide slope 31 is provided on the side of the first slider 3 facing the parting surface; a second slider 4 is provided on the inner side of both ends of the second mold 2, and a second guide slope 42 that is mirror-symmetrical to the first guide slope 31 is provided on the side of the second slider 4 facing the parting surface.

[0041] Please see Figure 2 Multiple ejector assemblies 5 penetrating the injection molding cavity, each ejector assembly 5 including an ejector body 51 coaxially arranged and an insert rod 52 provided at one end thereto, the insert rod 52 extending into the injection molding cavity to form a product positioning part, and the outer wall of the insert rod 52 forming a product molding space between the injection molding cavity and the outer wall of the insert rod 52.

[0042] The ejection mechanism located at the parting surface includes: a top block 6 that slides with all the ejector bodies 51, with a third inclined surface 61 matching the first guide inclined surface 31 and a fourth inclined surface 62 matching the second guide inclined surface 41 on its top sides respectively, and the top block 6 having a guide hole along its axis that matches the outer diameter of the ejector body 51.

[0043] Please see Figure 1 The push rod 7 drives the top block 6 to move axially along the sleeve body 51;

[0044] When the mold is opened, the ejector rod 7 drives the ejector block 6 to move axially along the ejector body 51. Through the cooperation of the third inclined surface 61 with the first guide inclined surface 31 and the fourth inclined surface 62 with the second guide inclined surface 41, the first slider 3 and the second slider 4 are pushed to slide and demold in the opposite direction perpendicular to the ejection direction. Then the ejector block 6 continues to move to eject the molded product out of the injection cavity.

[0045] The ejector structure provided in this embodiment of the utility model enables demolding with a top block, featuring synchronous demolding and anti-interference design: Through the mirror-symmetrical layout of the first and second guide slopes, and the matching arrangement of the third and fourth slopes on the top block, it ensures that the sliders on both sides slide and separate synchronously in opposite directions during mold opening, avoiding mold jamming or product damage caused by asynchronous movement. Structural integration and lightweight design: The top block and ejector sleeve assembly slide together through guide holes, and the top block is integrated as a unified power transmission source, replacing the traditional multi-drive unit design, significantly simplifying the mold structure, reducing manufacturing costs, and decreasing the overall mold volume. Precise, phased demolding: The top block operates in two steps under its drive: First stage: The sloped surfaces push the slider away from the undercut area of ​​the product, achieving initial demolding; Second stage: The top block continues to move, ejecting the product from the cavity, forming a continuous and efficient demolding sequence, shortening the molding cycle. Improved positioning accuracy and stability: The precise fit between the outer wall of the ejector sleeve and the guide hole, as well as the radial positioning of the insert rod in the injection cavity, effectively suppress the radial offset of the ejector sleeve during ejection, preventing product whitening or deformation, and is especially suitable for high-precision thin-walled part molding.

[0046] The third inclined surface is arranged parallel to the first guide inclined surface, the fourth inclined surface is arranged parallel to the second guide inclined surface, and the push rod is connected to the linear motion module, which can be a cylinder or a lead screw module.

[0047] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0048] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An ejection structure for demolding via a top block, characterized in that, include: In the mold-closed state, a first mold (1) and a second mold (2) are arranged opposite to each other. The first mold (1) has a plurality of first injection grooves (11) arranged along the parting surface on its inner side. The second mold (2) has a second injection groove (21) corresponding to the first injection groove (11) on its inner side. The first injection groove (11) and the second injection groove (21) form an injection cavity when the mold is closed. The first slider (3) is provided on the inner side of both ends of the first mold (1), and the first slider (3) is provided with a first guide slope (31) on the side facing the parting surface. The second slider (4) is provided on the inner side of both ends of the second mold (2). The side of the second slider (4) facing the parting surface is provided with a second guide slope (41) that is mirror-symmetrical to the first guide slope (31). Multiple ejector assemblies (5) penetrating the injection molding cavity, each ejector assembly (5) includes an ejector body (51) coaxially arranged and an insert rod (52) located at one end thereto. The insert rod (52) extends into the injection molding cavity to form a product positioning part, and the outer wall of the insert rod (52) forms a product molding space with the injection molding cavity. The ejection mechanism located at the parting line includes: The top block (6) that slides with all the sleeve bodies (51) has a third inclined surface (61) that matches the first guide inclined surface (31) and a fourth inclined surface (62) that matches the second guide inclined surface (41) on its top sides respectively. The top block (6) has a guide hole along its axis that matches the outer diameter of the sleeve body (51). A push rod (7) that drives the top block (6) to move axially along the sleeve body (51); When the mold is opened, the ejector rod (7) drives the ejector block (6) to move axially along the ejector body (51). Through the cooperation of the third inclined surface (61) with the first guide inclined surface (31) and the fourth inclined surface (62) with the second guide inclined surface (41), the first slider (3) and the second slider (4) are pushed to slide and demold in the opposite direction perpendicular to the ejection direction. Then the ejector block (6) continues to move to eject the molded product out of the injection cavity.

2. The ejection structure for demolding via a top block according to claim 1, characterized in that, The third inclined surface (61) is set parallel to the first guide inclined surface (31).

3. The ejection structure for demolding via a top block according to claim 1, characterized in that, The fourth inclined plane (62) is set parallel to the second guide inclined plane (41).

4. The ejection structure for demolding via a top block according to claim 1, characterized in that, The top rod (7) is connected to the linear motion module.

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