A structure of ejector pin facilitating secondary injection molding

Abstract

The utility model belongs to the field of electronic devices, especially relate to a ejection pin structure beneficial to secondary injection, include: ejection pin body, be cylindrical and axial is first direction, ejection pin body has at least two convex rings in the first direction arrangement, the axial direction of convex ring extends along the first direction, and the surface of ejection pin body is provided with the circumferential ring of convex ring along ejection pin body; support, with ejection pin body integrated molding through the mode of secondary injection, and the convex ring is contained in the support, and the height direction of support extends along the first direction. In the structure of the utility model, because ejection pin body is provided with at least two convex rings, therefore in the process of secondary injection, the overall structural strength of ejection pin body can be increased in the convex ring part, further prevent ejection pin body from producing excessive deformation in the process of mould closing, and two convex rings can play the limiting action, so that ejection pin body can be more accurate positioning after assembling into mould.

Description

Technical Field

[0001] This utility model belongs to the field of electronic devices, and in particular relates to an ejector pin structure that facilitates secondary injection molding. Background Technology

[0002] In existing ejector pin structures, such as Figure 1 As shown, the ejector pin body is typically a smooth cylindrical structure. During secondary injection molding, due to the lack of effective structural features on the outer surface of the ejector pin body, relative positional movement easily occurs between the ejector pin body and the support, regardless of whether the mold closes vertically or horizontally. Especially when the mold closes vertically, the hollow ejector pin body is easily deformed by compression, causing changes in the inner diameter of its internal hollow hole. This deformation directly affects the assembly accuracy of subsequent components such as spring pins and elastic elements, thus impacting the overall product quality and performance. Therefore, the ejector pin structure in the prior art suffers from inaccurate positioning and easy deformation during secondary injection molding, limiting its application in high-precision assembly fields. Utility Model Content

[0003] The purpose of this invention is to provide an ejector pin structure that facilitates secondary injection molding, thereby solving the technical problems of inaccurate positioning and easy deformation of the ejector pin structure in the secondary injection molding process in the prior art.

[0004] To achieve the above objectives, this utility model provides an ejector pin structure that facilitates secondary injection molding, comprising: an ejector pin body, which is columnar and has its axial direction in a first direction, wherein at least two convex rings are arranged on the ejector pin body in the first direction, the axial direction of the convex rings extends along the first direction, and the convex rings are circumferentially disposed around the surface of the ejector pin body; and a bracket, which is integrally formed with the ejector pin body by secondary injection molding, wherein the convex rings are housed in the bracket, and the height direction of the bracket extends along the first direction.

[0005] Optionally, the two ends of the ejector pin body along the first direction are a first end and a second end, respectively. The ejector pin body has a blind hole on the first end, and a spring pin and an elastic element are provided in the blind hole. The two ends of the elastic element abut against the bottom of the blind hole and the spring pin, respectively.

[0006] Optionally, the end of the spring pin near the elastic element is configured as a bevel.

[0007] Optionally, the ejector pin body has a right-angled groove at the second end, the right-angled groove extends along the first direction and penetrates the end face of the second end of the ejector pin body, and the right-angled groove penetrates the circumferential surface of the ejector pin body along the radial direction of the ejector pin body.

[0008] Optionally, three convex rings are provided, and the three convex rings are arranged along the first direction.

[0009] Optionally, the distance between the two opposite sides of the two protruding rings that are furthest apart in the first direction is 5.5 mm, and the thickness of the protruding ring is 1 mm.

[0010] Optionally, the outer end faces of the two outermost convex rings located in the first direction are flush with the two end faces of the bracket along the first direction.

[0011] Optionally, the bracket has a boss.

[0012] Optionally, at least a portion of the circumferential surface of the convex ring is provided with a flat groove.

[0013] Compared with the prior art, the above-mentioned one or more technical solutions in the ejector pin structure that facilitates secondary injection molding provided by the present invention have at least one of the following technical effects: In the injection molding process of the existing ejector pin body, since the outer surface of the existing ejector pin body is a smooth cylindrical surface, during the secondary injection molding process, regardless of whether the mold is closed vertically or horizontally (i.e., in the height direction of the support), it is easy to cause movement in the relative position between the ejector pin body and the support. Furthermore, when the mold is closed vertically, it is easy to cause extrusion deformation of the hollow ejector pin body, which in turn causes a change in the inner diameter of the hollow hole inside the ejector pin body, affecting the assembly of subsequent components such as spring pins and elastic elements. In the structure of the present invention, since the ejector pin body is provided with at least two convex rings, during the secondary injection molding process, the convex rings can increase the overall structural strength of the ejector pin body, thereby preventing excessive deformation of the ejector pin body during mold closing. In addition, the two convex rings can play a limiting role, so that the ejector pin body can be more accurately positioned after being assembled into the mold. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a cross-sectional structural diagram of the engagement state between the ejector body and the support in the prior art;

[0016] Figure 2 This is a structural schematic diagram of the engagement state between the ejector pin body and the support in an embodiment of this utility model;

[0017] Figure 3 for Figure 2 A structural diagram from another perspective;

[0018] Figure 4 This is a cross-sectional structural diagram of the engagement state of the ejector body and the bracket in an embodiment of this utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the ejector pin body in an embodiment of this utility model;

[0020] Figure 6 This is a schematic diagram of the support structure in an embodiment of the present invention.

[0021] The following are the labeling elements in the figure:

[0022] Ejector body 100, first end 110, second end 120, right-angle groove 121, convex ring 130, flat groove 131, blind hole 140;

[0023] 200mm spring pin, 210mm bevel;

[0024] Elastic element 300;

[0025] Bracket 400, boss 410. Detailed Implementation

[0026] The embodiments of the present invention are described in detail below, examples of which 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 the embodiments of the present invention, and should not be construed as limiting the present invention.

[0027] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "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 drawings. They are only for the convenience of describing the embodiments of 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.

[0028] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this embodiment of the invention, 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 part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0030] like Figures 2 to 6 As shown, this utility model provides an ejector pin structure that facilitates secondary injection molding, including an ejector pin body 100 and a support 400.

[0031] The ejector body 100 is columnar with its axial direction being the first direction. At least two protruding rings 130 are arranged on the ejector body 100 in the first direction. The axial direction of the protruding rings 130 extends along the first direction. The protruding rings 130 are arranged around the surface of the ejector body 100 in the circumferential direction. The bracket 400 is integrally formed with the ejector body 100 by secondary injection molding. The protruding rings 130 are housed in the bracket 400. The height direction of the bracket 400 extends along the first direction.

[0032] It is understandable that in the injection molding process of the existing ejector body 100, because the outer surface of the existing ejector body 100 is as follows... Figure 1 The smooth cylindrical surface shown indicates that, therefore, during the secondary injection molding process, regardless of the mold... Figure 1 In traditional mold making, whether the mold closes vertically or horizontally (i.e., along the height of the support 400), it can easily cause misalignment between the ejector pin body 100 and the support 400. Furthermore, when the mold closes vertically, it can easily cause compression deformation of the hollow ejector pin body 100, leading to changes in the inner diameter of the hollow hole and affecting the assembly of subsequent components such as the spring pin 200 and the elastic element 300. In the structure of this invention, since the ejector pin body 100 is provided with at least two raised rings 130, during the secondary injection molding process, the raised rings 130 can increase the overall structural strength of the ejector pin body 100, thereby preventing excessive deformation of the ejector pin body 100 during mold closing. Additionally, the two raised rings 130 can act as limiters, allowing for more precise positioning of the ejector pin body 100 after it is assembled into the mold.

[0033] It should be noted that the ejector pin body 100 is made of metal through machining, while the support 400 is made of insulating materials such as plastic through injection molding. Therefore, when these two different materials are joined together, they need to be formed through secondary injection molding. Specifically, secondary injection molding refers to the process of covering or bonding materials such as plastic to the surface or specific parts of the metal parts through injection molding to form an integral structure.

[0034] like Figure 4 As shown, in some embodiments of this utility model, the two ends of the ejector pin body 100 along the first direction are a first end 110 and a second end 120, respectively. A blind hole 140 is provided on the first end 110 of the ejector pin body 100. A spring pin 200 and an elastic element 300 are provided in the blind hole 140. The two ends of the elastic element 300 abut against the bottom of the blind hole 140 and the spring pin 200, respectively. The elastic element 300 can be a compression spring.

[0035] like Figure 4 As shown, in some embodiments of this utility model, the end of the spring needle 200 near the elastic element 300 is provided with a slope 210, which can increase the contact area with the elastic element 300, facilitate the smooth pressing of the elastic element 300, reduce stress concentration, and thus improve the service life of the spring needle 200 and the elastic element 300.

[0036] like Figure 4 and Figure 5 As shown, in some embodiments of this utility model, the ejector pin body 100 has a right-angled groove 121 at its second end 120. The right-angled groove 121 extends along a first direction and penetrates the end face of the second end 120 of the ejector pin body 100, and the right-angled groove 121 penetrates the circumferential surface of the ejector pin body 100 along its radial direction. It is understood that the above-mentioned right-angled groove 121 can be processed by milling, which facilitates subsequent wire bonding. At the same time, the right-angled groove 121 can also assist the ejector pin body 100 in positioning relative to the mold during the secondary injection molding process.

[0037] like Figure 4 and Figure 5 As shown, in some embodiments of this utility model, three convex rings 130 are provided, and the three convex rings 130 are arranged along a first direction. Specifically, the outer diameters of the three convex rings 130 can be set to be the same or different. When the outer diameters of the three convex rings 130 are different, it can prevent the ejector body 100 from moving relative to the support 400, and can promote a more stable mutual connection between the ejector body 100 and the support 400.

[0038] In some embodiments of this invention, the distance between the opposing sides of the two furthest protruding rings 130 of the ejector body 100 in the first direction is 5.5 mm, and the thickness of the protruding rings 130 is 1 mm. This spacing and thickness setting ensures that the protruding rings 130 are tightly integrated with the support 400 during the secondary injection molding process, while avoiding material waste due to excessive size or structural performance issues due to insufficient size. This dimensional design helps improve the stability and reliability of the ejector structure, ensuring its performance in practical applications.

[0039] like Figure 4 As shown, in some embodiments of this utility model, the outer end faces of the two outermost convex rings 130 located in the first direction are flush with the two end faces of the bracket 400 along the first direction. Aesthetically, the flush end faces make the entire ejector pin structure look more beautiful and regular, improving the product's appearance quality. From a functional perspective, the flush end faces can better withstand external pressure, avoiding stress concentration problems caused by uneven end faces, thereby improving the structural strength and service life of the ejector pin structure. Furthermore, this design also helps simplify the mold design and manufacturing process, improving production efficiency.

[0040] like Figure 3 and Figure 4 As shown, in some embodiments of this utility model, the bracket 400 has a boss 410, which can increase the thickness of the bracket 400 in the first direction, that is, in the height direction of the bracket 400, increase the contact length between the bracket 400 and the ejector body 100, and make the connection between the ejector body 100 and the bracket 400 more stable.

[0041] like Figure 5 As shown, in some embodiments of this utility model, at least a portion of the convex ring 130 has a flat groove 131 on its circumferential surface. The flat groove 131 can be machined by milling. The flat groove 131 can provide a larger force-bearing surface when the mold is closed, further preventing the ejector pin body 100 from deforming during the secondary injection molding process. In addition, the flat groove 131 can also prevent the ejector pin body 100 from rotating relative to the support 400.

[0042] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of this utility model. It should not be construed that the specific implementation of this utility model is limited to these descriptions. For those skilled in the art, the architectural form of this utility model can be flexibly varied without departing from its concept, and a series of products can be derived. Any simple deductions or substitutions should be considered as falling within the patent protection scope defined by the submitted claims.

Claims

1. An ejector pin structure that facilitates secondary injection molding, characterized in that, include: The ejector body is columnar and its axial direction is a first direction. At least two protruding rings are arranged on the ejector body in the first direction. The axial direction of the protruding rings extends along the first direction. The protruding rings are arranged around the surface of the ejector body in the circumferential direction. The bracket is integrally formed with the ejector pin body through secondary injection molding. The convex ring is housed within the bracket, and the height direction of the bracket extends along the first direction.

2. The ejector pin structure for secondary injection molding according to claim 1, characterized in that, The ejector pin body has a first end and a second end at its two ends along the first direction. The ejector pin body has a blind hole at the first end. A spring pin and an elastic element are provided in the blind hole. The two ends of the elastic element abut against the bottom of the blind hole and the spring pin, respectively.

3. The ejector pin structure for secondary injection molding according to claim 2, characterized in that, The end of the spring pin near the elastic element is set as an inclined surface.

4. The ejector pin structure for secondary injection molding according to claim 2, characterized in that, The ejector pin body has a right-angled groove at the second end. The right-angled groove extends along the first direction and penetrates the end face of the second end of the ejector pin body. The right-angled groove also penetrates the circumferential surface of the ejector pin body along the radial direction.

5. The ejector pin structure for secondary injection molding according to claim 1, characterized in that, The convex ring is provided in three parts, and the three convex rings are arranged along the first direction.

6. The ejector pin structure for secondary injection molding according to claim 1, characterized in that, The distance between the two opposite sides of the two protruding rings that are furthest apart in the first direction of the ejector pin body is 5.5 mm, and the thickness of the protruding ring is 1 mm.

7. The ejector pin structure for secondary injection molding according to claim 1, characterized in that, The outer end faces of the two outermost convex rings located in the first direction are flush with the two end faces of the bracket along the first direction.

8. The ejector pin structure for secondary injection molding according to claim 1, characterized in that, The bracket has a boss.

9. The ejector pin structure for secondary injection molding according to claim 1, characterized in that, At least a portion of the convex ring has a flat groove on its circumferential surface.

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