A plastic mold mesh feature ejection mechanism

Abstract

This application relates to an ejection mechanism for a mesh feature in a plastic mold, comprising: a push rod assembly, an ejector rod, a spring, and an ejector plate assembly, wherein: the push rod assembly movably clamps the bottom of the ejector rod and pushes the ejector rod upward; the top of the ejector rod is connected to the bottom surface of the ejector plate assembly; the spring is sleeved on the ejector rod, one end of which contacts the bottom surface of the ejector plate assembly, and the other end of which contacts the bottom surface of a slot provided on the rear mold; the ejector plate assembly is provided with a plurality of upward-facing ejector pins, which pass through the rear mold insert and contact the bottom surface of the mesh structure of the injection molded product. The method provided in this application, during mold opening, first uses the elasticity of the spring to lift the ejector plate assembly, thereby pre-ejecting the mesh structure on the rear mold insert through the ejector plate assembly, and then, under the push of the push rod assembly, drives the entire rear mold insert to be ejected, thus ensuring that the mesh structure is not damaged during the ejection process and ensuring the overall product yield.

Description

Technical Field

[0001] This application relates to the field of injection mold technology, and in particular to an ejection mechanism for mesh features in plastic molds. Background Technology

[0002] After injection molding, the molded product is typically ejected from the mold using an ejector mechanism, such as ejector pins. However, for products with a multi-mesh structure, simply using conventional ejector pins for demolding can lead to deformation and damage during the demolding process due to the lower strength of the mesh structure. This can result in structural defects and affect product yield. Utility Model Content

[0003] This application provides an ejection mechanism for the mesh features of a plastic mold to solve the problem in the prior art where the mesh structure of plastic products is prone to deformation and damage due to stress during demolding, thus causing product defects.

[0004] In a first aspect, this application provides an ejection mechanism for a mesh feature in a plastic mold, comprising: a push rod assembly, an ejector rod, a spring, and an ejector plate assembly, wherein:

[0005] The push rod assembly clamps the bottom of the push rod and pushes the push rod upward.

[0006] The top of the ejector pin is connected to the bottom surface of the ejector plate assembly;

[0007] A spring is fitted onto the ejector pin, with one end in contact with the bottom surface of the ejector plate assembly and the other end in contact with the bottom surface of the slot on the rear mold.

[0008] The ejector plate assembly is provided with several upward-facing ejector pins that pass through the rear mold insert and contact the bottom surface of the mesh structure of the injection molded product.

[0009] Furthermore, the push rod assembly includes: a push rod fixing block and a clamping rod. The push rod fixing block is disposed on both sides of the bottom of the top rod. The bottom surface of the push rod fixing block is connected to a lifting mechanism. The top of the push rod fixing block is an inclined surface. The clamping rod contacts the inclined surface of the push rod fixing block. The inclined surface of the push rod fixing block pushes the clamping rod toward the top rod.

[0010] Furthermore, the push rod assembly also includes a fixing plate, and the center of the fixing plate is provided with slots corresponding to the push rod fixing blocks and clamping rods on both sides. Adjacent slots are interconnected, and the push rod fixing blocks move upward through the slots under the drive of the lifting mechanism.

[0011] Furthermore, both sides of the top of the push rod fixing component are inclined surfaces. One inclined surface of the top of the push rod fixing component is in movable contact with the clamping rod, and the other inclined surface is in movable contact with the groove edge of the fixing plate.

[0012] Furthermore, the top rod is provided with a clamping groove, which is located near the bottom of the top rod, and the clamping rod is movably embedded in the clamping groove.

[0013] Furthermore, the ejector plate assembly includes: an ejector fixing plate, an ejector cover plate, and ejector pins. The ejector pins are regularly distributed on the upper surface of the ejector fixing plate. The ejector cover plate covers the upper surface of the ejector fixing plate. The ejector pins pass through the ejector cover plate and extend toward the direction of the rear mold insert. The spring contacts the bottom surface of the ejector fixing plate.

[0014] Furthermore, there is a gap between the ejector pin fixing plate and the ejector pin cover plate.

[0015] Furthermore, the rear mold is provided with a plurality of ejector plate guide pillars, and the ejector plate assembly is provided with a plurality of guide holes corresponding to the ejector plate guide pillars, through which the ejector plate guide pillars pass.

[0016] The technical solutions provided in this application have the following advantages compared with the prior art:

[0017] The method provided in this application embodiment first lifts the ejector plate assembly by the elastic action of the spring during mold opening, thereby pre-ejecting the mesh structure on the rear mold insert through the ejector plate assembly. Then, the entire rear mold insert is driven out by the push rod assembly, thereby ensuring that the mesh structure is not damaged during the ejection process and ensuring the overall product yield. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0021] Figure 1This is a schematic diagram of the structure of an ejection mechanism for a plastic mold mesh feature provided in an embodiment of this application.

[0022] Figure 2 This is a schematic diagram of the structure of an ejection mechanism for a plastic mold mesh feature provided in an embodiment of this application.

[0023] Figure 3 This is an exploded view of the push rod assembly.

[0024] Figure 4 This is an exploded view of the ejector plate assembly.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Push rod assembly; 11. Push rod fixing part; 111. Inclined surface; 12. Clamping rod; 13. Fixing plate; 131. Slot; 2. Ejector rod; 21. Clamping slot; 3. Spring; 4. Ejector plate assembly; 41. Ejector pin; 42. Ejector pin fixing plate; 43. Ejector pin cover plate; 44. Ejector plate guide post; 45. Guide hole; 5. Rear mold insert. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0029] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0030] To address the existing technical problem that the mesh structure of plastic products is prone to deformation and damage during demolding due to stress, thus causing product defects, this application provides a plastic mold mesh feature ejection mechanism. This mechanism allows the ejector plate assembly 4 to be lifted by the elastic action of the spring 3 during mold opening, thereby pre-ejecting the mesh structure on the rear mold insert 5. Then, the entire rear mold insert 5 is ejected under the push of the push rod assembly 1. This ensures that the mesh structure is not damaged during ejection, guaranteeing a high overall product yield.

[0031] Please see Figure 1 , Figure 2 This application provides an ejection mechanism for a mesh feature in a plastic mold, comprising: a push rod assembly 1, an ejector rod 2, a spring 3, and an ejector plate assembly 4, wherein:

[0032] The push rod assembly 1 can clamp the bottom of the push rod 2 and push the push rod 2 upward;

[0033] Top rod 2, the top of which is connected to the bottom surface of the ejector plate assembly 4;

[0034] Spring 3 is sleeved on ejector rod 2, with one end in contact with the bottom surface of ejector plate assembly 4 and the other end in contact with the bottom surface of slot 131 provided on the rear mold;

[0035] The ejector plate assembly 4 is provided with a number of upward-facing ejector pins 41, which pass through the rear mold insert 5 and contact the bottom surface of the mesh structure of the injection molded product.

[0036] During the injection molding process of plastic products, the ejector plate assembly 4 is located below the rear mold insert 5 corresponding to the mesh structure. After injection molding, when the mold is opened, the front mold and the rear mold separate, causing the pushing force applied to the rear mold insert 5 to be removed. Therefore, under the elastic action of the spring 3, the ejector plate assembly 4 is lifted upward, causing the ejector plate assembly to move upward, thereby lifting the rear mold insert 5 a certain distance. This pre-lifts the mesh structure area of ​​the product, allowing the mesh structure to pre-disengage from the rear mold insert 5. Then, the push rod assembly 1 drives the ejector rod 2 to move upward, thereby pushing the ejector plate assembly 4 upward. This allows the ejector pins 41 on the ejector plate assembly 4 to demold the mesh structure of the product. Before demolding the mesh structure, the ejector plate assembly 4 is lifted by the spring 3, which pre-demolds the mesh structure and separates it from the rear mold insert 5. This reduces the risk of tearing or breaking the mesh structure due to adhesion between the formed mesh structure and the rear mold insert 5 during the demolding process of the overall structure. As a result, it effectively ensures that the demolded product is less likely to have defects in the mesh structure, thus ensuring the yield of the demolded product.

[0037] Please see Figure 3 In some optional embodiments, the push rod assembly 1 includes a push rod fixing block and a clamping rod 12. The push rod fixing block is disposed on both sides of the bottom of the top rod 2. The bottom surface of the push rod fixing member 11 is connected to a lifting mechanism. The top of the push rod fixing block is an inclined surface 111. The clamping rod 12 contacts the inclined surface 111 of the push rod fixing block, and the inclined surface 111 of the push rod fixing block pushes the clamping rod 12 toward the top rod 2. When the push rod fixing block moves upward under the drive of the lifting mechanism, the inclined surface 111 at the top of the push rod fixing block tends to push the clamping rod 12, causing the clamping rods 12 on both sides to move toward the top rod 2 respectively, thereby clamping and fixing the top rod 2. This satisfies the requirement that when the push rod assembly 1 continues to move upward, the top rod 2 can be pushed upward, achieving the effect of lifting the ejector plate assembly 4 upward through the top rod 2. When the lifting mechanism drives the push rod fixing block to reset, as the push rod fixing block gradually moves down, the force applied to the clamping rod 12 by the inclined surface 111 gradually decreases until it is removed, thereby releasing the push rod 2. This allows the push rod 2 to have a certain clearance distance during the process of the ejector plate assembly 4 being compressed by the spring 3 when it moves downward under force before subsequent injection molding.

[0038] In some optional embodiments, the push rod assembly 1 further includes a fixing plate 13. The fixing plate 13 has slots 131 on the center of the push rod fixing blocks and clamping rods 12 on both sides. Adjacent slots 131 are interconnected. The push rod fixing blocks move upward through the slots 131 under the drive of the lifting mechanism. The slots 131 on the fixing plate 13 provide guidance for the lifting process of the push rod fixing blocks during the upward movement of the push rod fixing parts 11 driven by the lifting mechanism. This allows the lifting mechanism to guide and limit the push rod fixing blocks as they move up and down, so that the push rod fixing blocks can stably push the clamping rods 12 toward the ejector rod 2 and clamp and fix the ejector rod 2. This prevents the ejector rod 2 from slipping out between the clamping rods 12 during the movement of the ejector rod 2, which would seriously affect the ejection and demolding effect of the ejector plate assembly 4 on the mesh structure.

[0039] In some optional embodiments, both sides of the top of the push rod fixing member 11 are inclined surfaces 111. One inclined surface 111 of the top of the push rod fixing member 11 is in movable contact with the clamping rod 12, and the other inclined surface 111 is in movable contact with the edge of the groove 131 of the fixing plate 13.

[0040] In one optional embodiment provided in this example, the output end of the lifting mechanism is in movable contact with the bottom of the push rod fixing member 11, but there is no rigid connection between the output end of the lifting mechanism and the push rod fixing member 11. Therefore, when the lifting mechanism is activated and the output end moves upward, it pushes the push rod fixing member 11 upward; when the lifting mechanism is reset and the output end moves downward, the bottom of the push rod fixing member 11 loses support due to the descent of the push rod, and therefore the push rod fixing member 11 will fall downward under the action of gravity, thus always remaining in contact with the lifting mechanism. When the lifting mechanism pushes the push rod fixing member 11 upward, the inclined surface 111 on the outer side of the top of the push rod fixing member 11 contacts the edge of the slot 131. Therefore, the lateral thrust generated by the inclined surface 111 pushes the push rod fixing member 11 towards the ejector rod 2. At the same time, the inclined surface 111 on the inner side of the top of the push rod fixing member 11 pushes the clamping rod 12 towards the ejector rod 2. Thus, the ejector rod 2 is clamped and fixed by the clamping rods 12 on both sides of the ejector rod 2. This allows the ejector rod 2 to be lifted upward when the lifting mechanism continues to drive the push rod fixing member 11 upward, thereby ejecting the ejector plate assembly 4 and ejecting the mesh structure through the ejector plate assembly 4 for demolding.

[0041] In another optional embodiment provided in this example, the output end of the lifting mechanism is rigidly connected to the bottom of the push rod fixing member 11. Therefore, when the lifting mechanism is activated and the output end moves upward, the inclined surface 111 on the outer side of the top of the push rod fixing member 11 contacts the edge of the slot 131, and the lateral thrust generated by the inclined surface 111 pushes the push rod fixing member 11 toward the push rod 2. However, since the push rod fixing member 11 is rigidly connected to the output end of the lifting mechanism, the top of the push rod fixing member 11 will shift toward the push rod 2. At the same time, the inclined surface 111 on the inner side of the top of the push rod fixing member 11 will push the clamping rod 12 toward the push rod 2, so that the push rod 2 is clamped and fixed by the clamping rods 12 on both sides of the push rod 2. This allows the push rod 2 to be lifted upward when the lifting mechanism continues to drive the push rod fixing member 11 to move upward, thereby ejecting the ejector plate assembly 4 and ejecting the mesh structure through the ejector plate assembly 4.

[0042] In some optional embodiments, the ejector pin 2 is provided with a clamping groove 21, which is located near the bottom of the ejector pin 2, and the clamping rod 12 is movably embedded in the clamping groove 21. By providing the clamping groove 21, when the clamping rod 12 is pushed by the inclined surface 111 of the push rod fixing member 11, the clamping rod 12 is embedded in the clamping groove 21, and thus the clamping rod 12 is relatively fixed to the ejector pin 2, which facilitates the ejector pin 2 to move up and down, thereby pushing the ejector plate assembly 4 to move upward, and thus completely ejecting the mesh structure of the product from the rear mold insert 5 for demolding.

[0043] Please see Figure 4 In some optional embodiments, the ejector plate assembly 4 includes: an ejector fixing plate 4213, an ejector cover plate 43, and ejector pins 41. The ejector pins 41 are regularly distributed on the upper surface of the ejector fixing plate 4213. The ejector cover plate 43 covers the upper surface of the ejector fixing plate 4213. The ejector pins 41 pass through the ejector cover plate 43 and extend towards the rear mold insert 5. The spring 3 contacts the bottom surface of the ejector fixing plate 4213. There is a gap between the ejector fixing plate 4213 and the ejector cover plate 43.

[0044] Before mold opening, ejector pin 41 is pushed to a position flush with or slightly lower than the cavity surface of the rear mold insert 5. At this time, there is a gap between ejector pin fixing plate 4213 and ejector pin cover plate 43. When the front mold is removed, under the elastic action of spring 3, the ejector pin fixing plate 4213 is pushed upward, closing the gap between ejector pin fixing plate 4213 and ejector pin cover plate 43, allowing ejector pin 41 to pass through the rear mold insert 5 and lift the mesh structure of the product. This achieves pre-lifting of the mesh structure, separating the mesh structure from the rear mold insert 5 with a smaller force, thus avoiding deformation or damage to the mesh structure due to the larger demolding force during subsequent demolding, effectively ensuring product yield. By providing a gap between ejector pin fixing plate 4213 and ejector pin cover plate 43, a certain amount of movement is provided for spring 3 to lift ejector pin fixing plate 4213, meeting the requirements for pre-lifting.

[0045] In some optional embodiments, the rear mold is provided with a plurality of ejector plate guide pillars 44, and the ejector plate assembly 4 is provided with a plurality of guide holes 45 corresponding to the ejector plate guide pillars 44, through which the ejector plate guide pillars 44 pass. During the process of the ejector rod 2 pushing the ejector plate assembly 4 to move, the movement of the ejector plate assembly 4 is smoothly and reliably guided by the cooperation of the ejector plate guide pillars 44 and the guide holes 45, so as to ensure that the pre-lifting and ejection demolding processes of the mesh structure by the ejector pins 41 remain stable, avoiding deformation or damage to the mesh structure due to the displacement of the ejector pins 41, and ensuring product yield.

[0046] The method provided in this application embodiment first lifts the ejector plate assembly 4 by the elastic action of the spring 3 when the mold is opened, so as to pre-eject the mesh structure on the rear mold insert 5 by the ejector plate assembly 4, and then the entire rear mold insert 5 is driven to be ejected by the push rod assembly 1, so as to ensure that the mesh structure is not damaged during the ejection process and to ensure the overall product yield.

[0047] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0048] In the description of this application, 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., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 application.

[0049] 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 application, "multiple" means two or more, unless otherwise explicitly specified.

[0050] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a 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 application according to the specific circumstances.

[0051] In this application, unless otherwise expressly 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 being 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 being 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.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0053] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0054] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can exercise their rights within the scope of the technology disclosed in this application.

[0055] Various equivalent modifications or substitutions can be easily conceived, and all such modifications or substitutions should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A plastic mold grid feature ejection mechanism, characterized by, include: The push rod assembly, push rod, spring, and ejector plate assembly, wherein: The push rod assembly clamps the bottom of the push rod and pushes the push rod upward. The top of the ejector pin is connected to the bottom surface of the ejector plate assembly; A spring is fitted onto the ejector pin, with one end in contact with the bottom surface of the ejector plate assembly and the other end in contact with the bottom surface of the slot on the rear mold. The ejector plate assembly is provided with several upward-facing ejector pins that pass through the rear mold insert and contact the bottom surface of the mesh structure of the injection molded product.

2. The plastic mold net feature ejection mechanism of claim 1, wherein, The push rod assembly includes a push rod fixing block and a clamping rod. The push rod fixing block is disposed on both sides of the bottom of the top rod. The bottom surface of the push rod fixing block is connected to a lifting mechanism. The top of the push rod fixing block is an inclined surface. The clamping rod contacts the inclined surface of the push rod fixing block. The inclined surface of the push rod fixing block pushes the clamping rod toward the top rod.

3. The plastic mold net feature ejection mechanism of claim 2, wherein, The push rod assembly also includes a fixing plate. The center of the fixing plate is provided with slots corresponding to the push rod fixing blocks and clamping rods on both sides. Adjacent slots are interconnected. The push rod fixing blocks move upward through the slots under the drive of the lifting mechanism.

4. The plastic mold net feature ejection mechanism of claim 3, wherein, Both sides of the top of the push rod fixing component are inclined surfaces. One inclined surface of the top of the push rod fixing component is in movable contact with the clamping rod, and the other inclined surface is in movable contact with the edge of the groove of the fixing plate.

5. The plastic mold gate feature ejection mechanism of any of claims 2 to 4, wherein, The top rod is provided with a clamping groove, which is located near the bottom of the top rod, and the clamping rod is movably embedded in the clamping groove.

6. The plastic mold net feature ejection mechanism of claim 1, wherein, The ejector plate assembly includes an ejector fixing plate, an ejector cover plate, and ejector pins. The ejector pins are regularly distributed on the upper surface of the ejector fixing plate. The ejector cover plate covers the upper surface of the ejector fixing plate. The ejector pins pass through the ejector cover plate and extend toward the rear mold insert. The spring contacts the bottom surface of the ejector fixing plate.

7. The plastic mold net feature ejection mechanism of claim 6, wherein, There is a gap between the ejector pin fixing plate and the ejector pin cover plate.

8. The plastic mold net feature ejection mechanism of claim 1 or 6 or 7, wherein, The rear mold is provided with a number of ejector plate guide pillars, and the ejector plate assembly is provided with a number of guide holes corresponding to the ejector plate guide pillars, through which the ejector plate guide pillars pass.

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