Injection mold for step-by-step core pulling and demolding of front mold clamping hook

Abstract

The injection mold comprises a front mold core-pulling mechanism, a panel, an elastic plate, a front mold and a rear mold, the panel, the elastic plate, the front mold and the rear mold are sequentially stacked from top to bottom, the front mold core-pulling mechanism comprises an outer cylinder and an inner core assembly, the outer cylinder is fixedly connected to the elastic plate, the inner core assembly is fixedly connected to the panel, and the panel is fixedly connected to the elastic plate. The inner core assembly is further inserted into the outer cylinder in a sliding mode, and meanwhile a forming cavity used for forming a product clamping hook is formed between the lower end of the inner core assembly and the lower end of the outer cylinder. And buckling machine assemblies are mounted on the side surfaces of the elastic plate, the front mold and the rear mold, and are used for controlling the injection mold to be opened and closed according to a preset sequence, so that the panel, the elastic plate and the front mold can be opened in sequence in the mold opening process, and the inner core assembly and the outer cylinder are driven to be pulled out of the product clamping hook in sequence. By adopting a step-by-step core-pulling demolding mode, a product with a front mold inverted buckle and a limited space can be smoothly demolded, and the product cannot be damaged in the demolding process.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an injection mold with a front mold hook for step-by-step core pulling and demolding. Background Technology

[0002] Injection molds are tools used to produce plastic products. Their working principle is as follows: the plastic raw material is heated to a molten state, and the molten plastic is injected into the cavity of the mold through the injection device of the injection molding machine; in the cavity, the plastic material cools and solidifies, and then the molded plastic product is pushed out of the mold through the ejection system.

[0003] In the field of injection molding, mold design and structure have a crucial impact on the quality, production efficiency, and cost control of injection molded products. Traditional injection molds often face numerous challenges when handling injection molded products with complex structures, especially those involving front mold hook structures for demolding. (See the attached diagram in the manual.) Figure 1 In the product shown, the product hook is located on the front mold. Due to the special shape and position of the product hook, and the narrow surrounding space, there is no space to make an internal slider and internal inclined ejector for side core pulling. Existing injection molds usually use a forced single core pulling method during demolding, which can easily cause product damage, affect the stability of product quality, and fail to meet the requirements of high precision and high quality. Therefore, it is necessary to improve the existing technology to overcome its defects. Utility Model Content

[0004] The problem to be solved by this utility model is to provide an injection mold with a front mold hook and a step-by-step core pulling demolding method, so as to overcome the defect of existing injection molds that are prone to damage during the demolding process for products with front mold hooks and limited space.

[0005] The technical solution adopted by this utility model to solve its technical problem is: an injection mold for step-by-step core pulling and demolding of a front mold hook, comprising: a front mold core pulling mechanism and a panel, a spring plate, a front mold, and a rear mold arranged sequentially from top to bottom. The front mold core pulling mechanism includes an outer cylinder and an inner core assembly. The outer cylinder is fixedly connected to the spring plate, and the inner core assembly is fixedly connected to the panel. The inner core assembly also slides through the outer cylinder. At the same time, a molding cavity for forming a product hook is formed between the lower end of the inner core assembly and the lower end of the outer cylinder. A fastening assembly is installed on the side of the spring plate, the front mold, and the rear mold. The fastening assembly is used to control the injection mold to open and close in a predetermined order, so that the panel, the spring plate, and the front mold can open successively during the mold opening process, thereby driving the inner core assembly and the outer cylinder to be pulled out from the product hook one after another.

[0006] As a further improvement of this utility model, a first limiting component is provided between the panel and the spring plate. The first limiting component includes a first limiting bolt and a first spring. The top of the panel is provided with a first stepped hole. The first limiting bolt passes through the first stepped hole and its threaded end is fixedly connected to the spring plate. The bolt head of the first limiting bolt is located in the first stepped hole, and in the mold-closed state, there is a gap between the bolt head of the first limiting bolt and the first step in the first stepped hole. The first spring is fitted on the first limiting bolt, and the two ends of the first spring elastically abut against the panel and the spring plate respectively.

[0007] As a further improvement of this utility model, a second limiting component is provided between the spring plate and the front mold. The second limiting component includes a second limiting bolt and a second spring. The bottom of the front mold is provided with a second stepped hole. The second limiting bolt passes through the second stepped hole and its threaded end is fixedly connected to the spring plate. The bolt head of the second limiting bolt is located in the second stepped hole, and in the mold-closed state, there is a gap between the bolt head of the second limiting bolt and the second step in the second stepped hole. The second spring is fitted on the second limiting bolt, and the two ends of the second spring elastically abut against the spring plate and the front mold, respectively.

[0008] As a further improvement of this utility model, the fastening assembly includes a push plate, a fastening plate, a spring block, and a third spring. The fastening plate is fixed to one side of the rear mold, and the spring block is movably installed on one side of the front mold. The spring block is engaged in the fastening plate by the elastic force applied by the third spring to limit the opening of the front mold relative to the rear mold. The push plate is fixedly installed on one side of the spring plate and is used to follow the movement of the spring plate during the mold opening process to push the spring block away from the fastening plate.

[0009] As a further improvement of this utility model, a boss is provided on the inner side of the lower end of the push plate. The boss is located below the spring block, and a first oblique surface is provided on the top of the boss. A second oblique surface is provided on one side of the bottom of the spring block. The push plate pushes the spring block to move by cooperating with the first oblique surface and the second oblique surface.

[0010] As a further improvement of this utility model, a groove is provided on one side of the front mold, the spring block is accommodated in the groove and can slide in a direction perpendicular to the opening and closing direction, the upper end of the buckle plate extends upward to be horizontally opposite to the spring block, and the third spring is disposed between the front mold and the spring block to always apply an elastic force toward the buckle plate to the spring block.

[0011] As a further improvement of this utility model, the inner core assembly includes an inner core pull rod and an inner core insert, wherein the inner core insert is fixedly connected to the bottom of the inner core pull rod by a pin.

[0012] As a further improvement of this utility model, a nylon opener / closer is installed between the spring plate and the front mold.

[0013] The beneficial effects of this utility model are as follows: This utility model provides an injection mold for step-by-step core-pulling demolding of a front mold hook. The product hook is formed by the cooperation of an outer cylinder and an inner core assembly. The outer cylinder is fixedly connected to a spring plate, and the inner core assembly is fixedly connected to a panel. When the mold opens, the panel first drives the inner core assembly to move upward, so that the inner core assembly is pulled out from the partition groove of the product hook, making room for the elastic deformation of the two claws of the product hook. Then the panel drives the spring plate and the outer cylinder to move upward. During the core-pulling process of the outer cylinder, the two claws of the product hook can be forced to undergo a certain elastic deformation towards each other, so that the outer cylinder can be forcibly pulled out from the product hook. Finally, with the help of the fastening assembly, the front mold is opened. This step-by-step core-pulling demolding method can realize the smooth demolding of products with front mold undercuts and limited space, and will not cause product damage during the demolding process, ensuring the stability of product quality. At the same time, the step-by-step core-pulling demolding process is smooth and efficient, improving the efficiency of the entire injection molding production. Attached Figure Description

[0014] Figure 1 A 3D model of the product;

[0015] Figure 2 This is the front view of the injection mold for the step-by-step core-pulling and demolding of the front mold hook of this utility model;

[0016] Figure 3 This utility model is based on Figure 2 A cross-sectional view along direction AA as shown;

[0017] Figure 4 This utility model Figure 3 Enlarged view of section E in the middle;

[0018] Figure 5 This utility model is based on Figure 2 A cross-sectional view along the BB direction shown;

[0019] Figure 6 This utility model is based on Figure 2 A cross-sectional view along the CC direction as shown;

[0020] Figure 7 This utility model is based on Figure 2 A cross-sectional view along the DD direction as shown;

[0021] Figure 8 This is a perspective view of the buckle assembly in this utility model;

[0022] Figure 9 This is a half-sectional view of the front mold core-pulling mechanism in this utility model.

[0023] Referring to the accompanying drawings, the following explanations are provided:

[0024] 1. Panel; 2. Spring plate; 3. Front mold; 4. Rear mold; 5. Outer cylinder; 6. Product; 601. Product hook; 7. First limit bolt; 8. First spring; 9. Second limit bolt; 10. Second spring; 11. Push plate; 1101. Boss; 1102. First beveled surface; 12. Buckle plate; 13. Spring block; 1301. Second beveled surface; 14. Third spring; 15. Inner core pull rod; 16. Inner core insert; 17. Nylon opener / closer. Detailed Implementation

[0025] The preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0026] See Figures 1 to 9 This utility model provides an injection mold with a front mold hook and a step-by-step core-pulling and demolding mechanism, used for molding such as... Figure 1 The product 6 shown has a product hook 601. The lower part of the product hook 601 is cylindrical, and a dividing groove is provided in the middle of the upper part, thereby forming two spaced and opposite claws in the upper part of the product hook 601.

[0027] This utility model of a front mold hook-type step-by-step core-pulling injection mold includes: a front mold core-pulling mechanism and a panel 1, a spring plate 2, a front mold 3, and a rear mold 4 arranged sequentially from top to bottom. A cavity for molding a product 6 is formed between the front mold 3 and the rear mold 4. The front mold core-pulling mechanism includes an outer cylinder 5 and an inner core assembly. The outer cylinder 5 is arranged vertically, and its upper end is fixedly connected to the spring plate 2. The inner core assembly is also arranged vertically, and its upper end is fixedly connected to the panel 1. The inner core assembly also slides coaxially within the outer cylinder 5. The lower end of the inner core assembly and the lower end of the outer cylinder 5 both extend into the cavity, and a molding cavity for molding a product hook 601 is formed between the lower end of the inner core assembly and the lower end of the outer cylinder 5. During injection molding, a partition groove for the product hook 601 is formed at the lower end of the inner core assembly.

[0028] In addition, the sides of the spring plate 2, the front mold 3 and the rear mold 4 are equipped with a fastening assembly. The fastening assembly is used to control the injection mold to open and close in a predetermined order so that the panel 1, the spring plate 2 and the front mold 3 can open in succession during the mold opening process, thereby driving the inner core assembly and the outer cylinder 5 to be pulled out from the product hook 601 one after another.

[0029] During the mold opening process, panel 1 first moves the inner core assembly upward, causing it to be pulled out of the partition groove of product hook 601, making room for the elastic deformation of the two claws of product hook 601. Then, panel 1 moves the spring plate 2 and outer cylinder 5 upward. During the core-pulling process of outer cylinder 5, the two claws of product hook 601 are forced to undergo a certain elastic deformation towards each other, allowing outer cylinder 5 to be forcibly pulled out from product hook 601. Finally, panel 1 moves the front mold 3 to open, and the product 6 is ejected through the ejection mechanism. This utility model adopts this step-by-step core-pulling demolding method, which enables smooth demolding of products with undercuts in the front mold and limited space, without causing product damage during demolding, ensuring product quality stability. Furthermore, the step-by-step core-pulling demolding process is smooth and efficient, improving the overall efficiency of injection molding production.

[0030] See Figure 4 and Figure 9 In this invention, the inner core assembly includes an inner core-pulling rod 15 and an inner core insert 16. The upper end of the inner core-pulling rod 15 is fixedly connected to the panel 1, and the inner core insert 16 is fixedly connected to the bottom of the inner core-pulling rod 15 by a pin. The forming cavity of the product hook 601 is formed between the lower end of the inner core insert 16 and the lower end of the outer cylinder 5. By designing the inner core assembly as a split structure, this invention facilitates processing, allowing the inner core-pulling rod 15 and the inner core insert 16 to be processed separately, reducing processing difficulty and ensuring processing accuracy.

[0031] See Figure 5 A first limiting component is provided between panel 1 and spring plate 2. The first limiting component includes a first limiting bolt 7 and a first spring 8. The top of panel 1 has a first stepped hole. The first limiting bolt 7 passes through the first stepped hole from top to bottom and its threaded end is fixedly connected to spring plate 2. The bolt head of the first limiting bolt 7 is located in the first stepped hole, and in the mold-closed state, there is a gap between the bolt head of the first limiting bolt 7 and the first step in the first stepped hole. During the mold opening process, panel 1 first moves the inner core component upward until the first step in the first stepped hole abuts against the bolt head of the first limiting bolt 7. At this time, the inner core component has been pulled out from the product hook 601. Then, panel 1 moves spring plate 2 upward through the first limiting bolt 7.

[0032] The first spring 8 is fitted onto the first limiting bolt 7, and the two ends of the first spring 8 elastically abut against the panel 1 and the spring plate 2, respectively.

[0033] In addition, such as Figure 7As shown, this utility model also has a nylon opener / closer 17 installed between the spring plate 2 and the front mold 3. Under the elastic force of the nylon opener / closer 17 and the first spring 8, it can be ensured that the panel 1 will not drive the spring plate 2 during the upward movement of the panel 1 until the first step in the first stepped hole abuts against the bolt head of the first limit bolt 7. Only then will the panel 1 drive the spring plate 2 to move upward through the first limit bolt 7.

[0034] See Figure 6 A second limiting assembly is provided between the spring plate 2 and the front mold 3. The second limiting assembly includes a second limiting bolt 9 and a second spring 10. The bottom of the front mold 3 has a second stepped hole. The second limiting bolt 9 passes through the second stepped hole from bottom to top and its threaded end is fixedly connected to the spring plate 2. The bolt head of the second limiting bolt 9 is located in the second stepped hole, and in the mold-closed state, there is a gap between the bolt head of the second limiting bolt 9 and the second step in the second stepped hole. When the panel 1 moves the spring plate 2 upward by the first limiting bolt 7 until the bolt head of the second limiting bolt 9 abuts against the second step in the second stepped hole, the spring plate 2 then drives the front mold 3 to open via the second limiting bolt 9. The second spring 10 is fitted onto the second limiting bolt 9, and both ends of the second spring 10 elastically abut against the spring plate 2 and the front mold 3, respectively.

[0035] See Figure 6 and Figure 8 The latching assembly includes a push plate 11, a latching plate 12, a spring block 13, and a third spring 14. The front mold 3 has a sliding groove on its side, and the spring block 13 is movably accommodated within the sliding groove and can move along a direction perpendicular to the mold opening and closing direction (within a certain range). Figure 6 For reference, that is, sliding in the left and right horizontal direction. The lower end of the buckle plate 12 is fixed to the side of the rear mold 4, and the upper end of the buckle plate 12 extends upward to be horizontally opposite to the spring block 13. The third spring 14 is disposed between the front mold 3 and the spring block 13 to always apply an elastic force toward the buckle plate 12 to the spring block 13. Then, under the elastic force applied by the third spring 14, the spring block 13 protrudes outward from the front mold 3 and is locked in the buckle plate 12 to limit the opening of the front mold 3 relative to the rear mold 4.

[0036] Furthermore, the push plate 11 is fixedly installed on the side of the spring plate 2. The lower end of the push plate 11 extends vertically downward to a position lower than the spring block 13. The inner side of the lower end of the push plate 11 is provided with a boss 1101. The boss 1101 is located below the spring block 13. The top of the boss 1101 is provided with a first oblique surface 1102. The bottom side of the spring block 13 is provided with a second oblique surface 1301. The inclination angles of the first oblique surface 1102 and the second oblique surface 1301 are the same.

[0037] During the mold opening process, as the push plate 11 moves upward with the spring plate 2, the first oblique surface 1102 and the second oblique surface 1301 come into contact with each other. As the push plate 11 continues to move upward, the push plate 11 pushes the spring block 13 back into the front mold 3 through the cooperation of the first oblique surface 1102 and the second oblique surface 1301, so that the spring block 13 disengages from the buckle plate 12, thereby releasing the lock between the front mold 3 and the rear mold 4. Then the rear spring plate 2 can drive the front mold 3 to open through the second limit bolt 9.

[0038] To further illustrate this utility model, the mold-making process of this utility model includes the following three stages:

[0039] In the first mold opening stage, panel 1 opens; panel 1 first moves the inner core component upward, so that the inner core component is pulled out from the partition groove of product hook 601;

[0040] In the second mold opening stage, the spring plate 2 opens; the panel 1 moves upward until the first step in its first step hole abuts against the bolt head of the first limiting bolt 7. Then, the panel 1 drives the spring plate 2 and the outer cylinder 5 to move upward synchronously through the first limiting bolt 7, so that the outer cylinder 5 is forcibly pulled out from the product hook 601.

[0041] In the third mold opening stage, the front mold 3 opens; the spring plate 2 is driven by the panel 1 to move upward until the bolt head of the second limit bolt 9 abuts against the second step in the second step hole of the front mold 3. At the same time, the spring plate 2 drives the push plate 11 to push the spring block 13 away from the buckle plate 12, releasing the lock between the front mold 3 and the rear mold 4. In the following process, the spring plate 2 drives the front mold 3 to open through the second limit bolt 9.

[0042] Therefore, the injection mold of this utility model, which uses a front mold hook step-by-step core-pulling demolding method, forms the product hook 601 by cooperating with the outer cylinder 5 and the inner core assembly. The outer cylinder 5 is fixedly connected to the spring plate 2, and the inner core assembly is fixedly connected to the panel 1. When the mold is opened, the panel 1 first drives the inner core assembly to move upward, so that the inner core assembly is pulled out from the partition groove of the product hook 601, making room for the elastic deformation of the two claws of the product hook 601. Then, the panel 1 drives the spring plate 2 and the outer cylinder 5 to move upward. During the core-pulling process of the outer cylinder 5, the two claws of the product hook 601 are forced to undergo a certain elastic deformation towards each other, so that the outer cylinder 5 can be forcibly pulled out from the product hook 601. Finally, with the help of the fastening assembly, the front mold 3 is opened. This step-by-step core-pulling demolding method can realize the smooth demolding of products with front mold undercuts and limited space, and will not cause product damage during the demolding process, ensuring the stability of product quality. At the same time, the step-by-step core-pulling demolding process is smooth and efficient, improving the efficiency of the entire injection molding production.

[0043] Many specific details have been set forth in the above description to provide a full understanding of this utility model. However, the above description is only a preferred embodiment of this utility model, and this utility model can be implemented in many other ways different from those described herein. Therefore, this utility model is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model using the methods and techniques disclosed above, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, shall still fall within the protection scope of the technical solution of this utility model.

Claims

1. An injection mold with a front mold hook and a step-by-step core-pulling demolding mechanism, characterized in that, include: The front mold core-pulling mechanism and the panel (1), spring plate (2), front mold (3) and rear mold (4) arranged sequentially from top to bottom. The front mold core-pulling mechanism includes an outer cylinder (5) and an inner core assembly. The outer cylinder (5) is fixedly connected to the spring plate (2), and the inner core assembly is fixedly connected to the panel (1). The inner core assembly is also slidably inserted into the outer cylinder (5). At the same time, a molding cavity for forming a product hook (601) is formed between the lower end of the inner core assembly and the lower end of the outer cylinder (5). The spring plate (2), the front mold (3) and the rear mold (4) are equipped with a fastening assembly. The fastening assembly is used to control the injection mold to open and close in a predetermined order so that the panel (1), the spring plate (2) and the front mold (3) can open successively during the mold opening process, thereby driving the inner core assembly and the outer cylinder (5) to be pulled out from the product hook (601) one after another.

2. The injection mold for step-by-step core pulling and demolding according to claim 1, characterized in that: A first limiting component is provided between the panel (1) and the spring plate (2). The first limiting component includes a first limiting bolt (7) and a first spring (8). The top of the panel (1) is provided with a first stepped hole. The first limiting bolt (7) passes through the first stepped hole and its threaded end is fixedly connected to the spring plate (2). The bolt head of the first limiting bolt (7) is located in the first stepped hole. In the mold closing state, there is a gap between the bolt head of the first limiting bolt (7) and the first step in the first stepped hole. The first spring (8) is fitted on the first limiting bolt (7), and the two ends of the first spring (8) elastically abut against the panel (1) and the spring plate (2) respectively.

3. The injection mold for step-by-step core pulling and demolding according to claim 1, characterized in that: A second limiting component is provided between the spring plate (2) and the front mold (3). The second limiting component includes a second limiting bolt (9) and a second spring (10). The bottom of the front mold (3) is provided with a second stepped hole. The second limiting bolt (9) passes through the second stepped hole and its threaded end is fixedly connected to the spring plate (2). The bolt head of the second limiting bolt (9) is located in the second stepped hole. In the mold closing state, there is a gap between the bolt head of the second limiting bolt (9) and the second step in the second stepped hole. The second spring (10) is fitted on the second limiting bolt (9), and the two ends of the second spring (10) elastically abut against the spring plate (2) and the front mold (3) respectively.

4. The injection mold for step-by-step core pulling and demolding according to claim 3, characterized in that: The fastening assembly includes a push plate (11), a fastening plate (12), a spring block (13), and a third spring (14). The fastening plate (12) is fixed to one side of the rear mold (4), and the spring block (13) is movably installed on one side of the front mold (3). The spring block (13) is engaged in the fastening plate (12) by the elastic force applied by the third spring (14) to restrict the front mold (3) from opening relative to the rear mold (4). The push plate (11) is fixedly installed on one side of the spring plate (2). The push plate (11) is used to move with the spring plate (2) during the mold opening process to push the spring block (13) away from the fastening plate (12).

5. The injection mold for step-by-step core pulling and demolding according to claim 4, characterized in that: The push plate (11) has a boss (1101) on the inner side of its lower end. The boss (1101) is located below the spring block (13). The top of the boss (1101) has a first oblique surface (1102). The bottom side of the spring block (13) has a second oblique surface (1301). The push plate (11) pushes the spring block (13) to move by cooperating with the first oblique surface (1102) and the second oblique surface (1301).

6. The injection mold for step-by-step core pulling and demolding according to claim 4, characterized in that: The front mold (3) has a groove on one side, the spring block (13) is housed in the groove and can slide in a direction perpendicular to the opening and closing direction, the upper end of the buckle plate (12) extends upward to be horizontally opposite to the spring block (13), and the third spring (14) is disposed between the front mold (3) and the spring block (13) to always apply an elastic force toward the buckle plate (12) to the spring block (13).

7. The injection mold for step-by-step core pulling and demolding according to claim 1, characterized in that: The inner core assembly includes an inner core pull rod (15) and an inner core insert (16), the inner core insert (16) being fixedly connected to the bottom of the inner core pull rod (15) by a pin.

8. The injection mold for step-by-step core pulling and demolding according to claim 1, characterized in that: A nylon opener (17) is installed between the spring plate (2) and the front mold (3).

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