Secondary ejection demolding structure of injection molding mold

Abstract

The secondary ejection demolding structure comprises a mold core plate arranged on a mold core fixing plate, the secondary ejection demolding structure further comprises an ejection mechanism, the ejection mechanism comprises a plurality of ejection blocks with forming faces, a plurality of ejector pins and a driving assembly, the ejection blocks and the ejector pins are slidably connected to the mold core plate in the mold opening direction of the mold, and the driving assembly is arranged on the mold core plate. Connecting rods are fixedly connected to the ejector blocks correspondingly, a plurality of limiting holes are formed in the mold core fixing plate, a plurality of first limiting blocks are slidably connected into the limiting holes in the mold opening direction of the mold, and the connecting rods penetrate into the limiting holes correspondingly and are fixedly connected to the first limiting blocks; the driving assembly is used for driving the multiple ejector pins and the multiple ejector blocks to slide. By means of secondary ejection, in the process of not influencing ejection passing of the ejector pin, ejection of the ejector block is increased, the stress area during first ejection is increased, a product is sequentially demolded from the mold core plate and the ejector block in two times, and the possibility of deformation of the grating product in the demolding process is reduced.

Description

Technical Field

[0001] The utility model relates to the field of injection molding dies, in particular to a secondary ejection and demolding structure for an injection molding die. Background Art

[0002] The ejection of an injection mold is a key link in the injection molding process. After a plastic product is cooled and solidified in the cavity of an injection mold, it needs to be taken out of the mold. The function of the ejection mechanism is to separate the molded product from the cavity and core of the mold and push it out of the mold for the next round of injection production, ensuring that the product does not deform or damage during the ejection process. For example, for some thin-walled and complex-structured plastic products, a reasonable ejection method and position are crucial.

[0003] Refer to Figure 5 , which is a schematic diagram of the product structure. In the prior art, single ejection is usually performed through the ejector pin 32 to ensure the production efficiency of the product. However, when the number of ejector pins 32 is too small or the position is improper, the grille 4 product will receive uneven forces during the ejection process. Such uneven forces will cause the grille 4 to be deformed due to excessive local stress. Summary of the Utility Model

[0004] In order to reduce the possibility of deformation of the grille product during demolding, the present application provides a secondary ejection and demolding structure for an injection molding die.

[0005] The secondary ejection and demolding structure for an injection molding die provided by the present application adopts the following technical solutions:

[0006] A secondary ejection and demolding structure for an injection molding die includes a core plate with a product molding surface. The core plate is arranged on a core fixing plate and further includes an ejection mechanism for ejecting the molded product from the core plate. The ejection mechanism includes a plurality of ejector blocks with molding surfaces, a plurality of ejector pins, and a driving component. The plurality of ejector blocks and the plurality of ejector pins are respectively slidably connected to the core plate along the mold opening direction. A connecting rod is fixedly connected to each of the plurality of ejector blocks. A plurality of limiting holes are formed in the core fixing plate. A plurality of first limiting blocks are slidably connected to the limiting holes along the mold opening direction. The plurality of connecting rods respectively pass through the limiting holes and are fixedly connected to the plurality of first limiting blocks. The driving component is used to drive the sliding of the plurality of ejector pins and the plurality of ejector blocks respectively.

[0007] By adopting the above technical solution, the driving component drives the sliding of multiple ejector pins and multiple ejector blocks respectively. After the multiple ejector pins and multiple ejector blocks simultaneously eject the molded product, the molded product remains on the multiple ejector blocks. The sliding of the multiple ejector blocks is limited by the first limiting block and the limiting hole. After the ejector block moves a certain distance, it stops moving, and the ejector pin continues to move to eject the molded product from the multiple ejector blocks. Through the secondary ejection, without affecting the travel of the ejector pin, the ejection of the ejector block is increased, the force-bearing area during the first ejection is increased, and the product is demolded from the core plate and the ejector block in two steps in sequence, reducing the possibility of deformation of the grille product during the demolding process.

[0008] Preferably, the driving component includes an ejector pin plate and an elastic member. The ejector pin plate is slidably connected to the core fixing plate along the mold opening direction. One ends of the multiple ejector pins away from the core plate are respectively fixedly connected to the ejector pin plate. The elastic member is arranged on the core fixing plate, and the elastic member always drives the connecting rod to slide towards the core plate side.

[0009] By adopting the above technical solution, when the ejector pin plate moves, it drives the ejector pins to move together. The elastic member drives the movement of the connecting rod, thereby driving the ejector block to move, enabling the ejector pins and the ejector blocks to move separately, and performing secondary ejection on the grille product, reducing the possibility of deformation of the grille product during the demolding process.

[0010] Preferably, the ejector pin plate is provided with a plurality of limiting cavities. A plurality of second limiting blocks are respectively slidably connected in the plurality of limiting cavities. The plurality of second limiting blocks are respectively fixedly connected to the plurality of connecting rods. Two ends of the elastic member are respectively abutted against the second limiting blocks and the core fixing plate.

[0011] By adopting the above technical solution, by arranging the limiting cavities and the second limiting blocks, the elastic member drives the sliding of the second limiting blocks to limit the movement of the ejector blocks, enabling the ejector pins and the ejector blocks to move synchronously. When the ejector block moves to the limit position, the ejector pin can still continue to move, enabling secondary demolding of the grille without affecting the ejection stroke of the ejector pin and without affecting the production efficiency of the grille product.

[0012] Preferably, a plurality of guide posts are arranged on the core fixing plate, and the plurality of guide posts respectively penetrate through the ejector pin plate.

[0013] By adopting the above technical solution, the arrangement of the guide posts guides and limits the movement of the ejector pin plate.

[0014] Preferably, the multiple ejector blocks are respectively located in the middle part of the molded product, and the multiple ejector pins are respectively evenly distributed along the edge part of the molded product.

[0015] By adopting the above technical solution, the top block ejects a large area of the middle part of the grille, and the ejector pin ejects a small area of the edge of the grille. Then the ejector pin ejects the grille from the top block to achieve the purpose of secondary ejection, which facilitates the ejection and demolding of the molded product and reduces the possibility of deformation of the grille product during demolding.

[0016] Preferably, a limiting post is provided on the ejector pin plate. When the ejector pin plate slides towards the core plate side to the limit position, the limiting post abuts against the core plate.

[0017] By adopting the above technical solution, the setting of the limiting post limits the movement of the ejector pin plate and increases the accuracy of the movement of multiple ejector pins and top blocks.

[0018] Preferably, a mating surface is provided on the circumferential side of the connecting rod, and a mating block that can cooperate with the connecting rod is provided on the core plate. The connecting rod passes through and is slidably connected to the mating block.

[0019] By adopting the above technical solution, the movement of the connecting rod is guided and limited, and the accuracy of the movement of the top block is increased.

[0020] The technical effects of the present utility model are mainly reflected in the following aspects:

[0021] 1. By setting a driving ejection mechanism in the present utility model, the driving components respectively drive the sliding of multiple ejector pins and multiple top blocks. After multiple ejector pins and multiple top blocks simultaneously eject the molded product, the molded product remains on multiple top blocks. The sliding of multiple top blocks is limited by the first limiting block and the limiting hole. After the top block moves a certain distance, it stops moving, and the ejector pin continues to move to eject the molded product from multiple top blocks; through secondary ejection, without affecting the ejection path of the ejector pin, the ejection of the top block is increased, the force-bearing area during the first ejection is increased, and the product is demolded from the core plate and the top block in two steps in sequence, reducing the possibility of deformation of the grille product during demolding;

[0022] 2. By setting a driving component in the present utility model, when the ejector pin plate moves, it drives the ejector pin to move together. The elastic member drives the movement of the connecting rod, thereby driving the top block to move, enabling the ejector pin and the top block to move separately, and performing secondary ejection on the grille product, reducing the possibility of deformation of the grille product during demolding;

[0023] 3. By setting a limiting cavity and a second limiting block in the present utility model, the elastic member drives the sliding of the second limiting block to limit the movement of the top block, enabling the ejector pin and the top block to move synchronously. When the top block moves to the limit position, the ejector pin can still continue to move, enabling secondary demolding of the grille without affecting the ejection stroke of the ejector pin and without affecting the production efficiency of the grille product. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0025] Figure 2 It is a schematic diagram of the core plate structure of an embodiment of the present application.

[0026] Figure 3 It is a schematic diagram of the ejection assembly structure of an embodiment of the present application.

[0027] Figure 4 It is along Figure 3 The enlarged view at position A in

[0028] Figure 5 It is a schematic diagram of the product structure of an embodiment of the present application.

[0029] Explanation of reference numerals: 1, core plate; 11, fitting block; 2, core fixing plate; 21, limiting hole; 22, first limiting block; 23, guiding column; 3, ejection mechanism; 31, ejector block; 311, connecting rod; 3111, fitting surface; 32, ejector pin; 33, driving component; 331, ejector pin plate; 3311, limiting cavity; 3312, second limiting block; 3313, limiting column; 332, elastic component; 3321, spring; 4, grille. Specific embodiments

[0030] The following is further described in detail with reference to the attached Figures 1 - 5 to make the technical solution of the present application easier to understand and master.

[0031] An embodiment of the present application discloses a secondary ejection and demolding structure for an injection molding die.

[0032] Referring to Figures 3 - 5 , a secondary ejection and demolding structure for an injection molding die in this embodiment includes a core plate 1 with a product molding surface, the core plate 1 is fixedly connected to a core fixing plate 2, and further includes an ejection mechanism 3. The ejection mechanism 3 is used to eject the molded product from the core plate 1. The ejection mechanism 3 includes a plurality of ejector blocks 31 with molding surfaces, a plurality of ejector pins 32, and a driving component 33. The plurality of ejector blocks 31 and the plurality of ejector pins 32 are respectively slidably connected to the core plate 1 along the mold opening direction. A connecting rod 311 is fixedly connected to each of the plurality of ejector blocks 31. A plurality of limiting holes 21 are opened on the core fixing plate 2. A plurality of first limiting blocks 22 are slidably connected to the limiting holes 21 along the mold opening direction. The plurality of connecting rods 311 respectively pass through the limiting holes 21 and are fixedly connected to the plurality of first limiting blocks 22. The driving component 33 is used to drive the sliding of the plurality of ejector pins 32 and the plurality of ejector blocks 31 respectively.

[0033] Referring to Figure 2, multiple top blocks 31 are respectively located in the middle part of the molded product, and multiple ejector pins 32 are evenly distributed along the edge part of the molded product. The top blocks 31 eject a large area in the middle of the grille 4, and the ejector pins 32 eject a small area at the edge of the grille 4. Then the ejector pins 32 eject the grille 4 from the top blocks 31 to achieve the purpose of secondary ejection, facilitating the ejection and demolding of the molded product and reducing the possibility of deformation of the grille 4 product during demolding.

[0034] Refer to Figures 1 - 4 , the driving component 33 drives the sliding of multiple ejector pins 32 and multiple top blocks 31 respectively. After multiple ejector pins 32 and multiple top blocks 31 eject the molded product at the same time, the molded product remains on multiple top blocks 31. The sliding of multiple top blocks 31 is limited by the first limiting block 22 and the limiting hole 21. After the top blocks 31 move a certain distance, they stop moving, and the ejector pins 32 continue to move to eject the molded product from multiple top blocks 31; through secondary ejection, without affecting the ejection path of the ejector pins 32, the ejection of the top blocks 31 is increased, the force-bearing area during the first ejection is increased, and the product is demolded from the core plate 1 and the top blocks 31 in two steps in sequence, reducing the possibility of deformation of the grille 4 product during demolding.

[0035] Refer to Figures 1 - 4 , the driving component 33 includes an ejector pin plate 331 and an elastic member 332. The ejector pin plate 331 is slidably connected to the core fixing plate 2 along the mold opening direction. One end of each of the multiple ejector pins 32 away from the core plate 1 is fixedly connected to the ejector pin plate 331. The elastic member 332 is arranged on the core fixing plate 2, and the elastic member 332 always drives the connecting rod 311 to slide towards the core plate 1 side. When the ejector pin plate 331 moves, it drives the ejector pins 32 to move together. The movement of the elastic member 332 drives the movement of the connecting rod 311, thereby driving the top block 31 to move, enabling the ejector pins 32 and the top blocks 31 to move separately to perform secondary ejection on the grille 4 product and reducing the possibility of deformation of the grille 4 product during demolding.

[0036] Refer to Figures 1 - 4 , the ejector pin plate 331 is provided with multiple limiting cavities 3311. Multiple second limiting blocks 3312 are slidably connected inside the multiple limiting cavities 3311 respectively. Multiple second limiting blocks 3312 are fixedly connected to the corresponding connecting rods 311 respectively. The elastic member 332 is a spring 3321. Two ends of the spring 3321 are respectively abutted against the second limiting block 3312 and the core fixing plate 2. By setting the limiting cavities 3311 and the second limiting blocks 3312, the spring 3321 drives the sliding of the second limiting blocks 3312 to limit the movement of the top block 31, enabling the ejector pins 32 and the top blocks 31 to move synchronously. When the top block 31 moves to the limit position, the ejector pins 32 can still continue to move, enabling secondary demolding of the grille 4 without affecting the ejection stroke of the ejector pins 32 and without affecting the production efficiency of the grille 4 product.

[0037] Refer to Figures 1 - 4 , several guide posts 23 are fixedly connected to the core fixing plate 2, and the several guide posts 23 respectively penetrate through the ejector pin plate 331. The arrangement of the guide posts 23 guides and limits the movement of the ejector pin plate 331. A limit post 3313 is fixedly connected to the ejector pin plate 331. When the ejector pin plate 331 slides towards the core plate 1 to the extreme position, the limit post 3313 abuts against the core plate 1. The arrangement of the limit post 3313 limits the movement of the ejector pin plate 331, increasing the accuracy of the movement of multiple ejector pins 32 and ejector blocks 31. A mating surface 3111 is provided on the circumferential side surface of the connecting rod 311, and a mating block 11 that can cooperate with the connecting rod 311 is provided on the core plate 1. The connecting rod 311 penetrates through and is slidably connected to the mating block 11. The movement of the connecting rod 311 is guided and limited, increasing the accuracy of the movement of the ejector block 31.

[0038] Of course, the above are only typical examples of this application. In addition, this application can also have many other specific implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by this application.

Claims

1. A secondary ejection and demolding structure for an injection molding die, including a core plate (1) with a product molding surface, and the core plate (1) is arranged on a core fixing plate (2), characterized in that: It further includes an ejection mechanism (3) which is used to eject the formed product from the core plate (1). The ejection mechanism (3) includes a plurality of ejector blocks (31) with forming surfaces, a plurality of ejector pins (32) and a driving assembly (33). The plurality of ejector blocks (31) and the plurality of ejector pins (32) are respectively slidably connected to the core plate (1) along the mold opening direction. A connecting rod (311) is fixedly connected to each of the plurality of ejector blocks (31). A plurality of limiting holes (21) are formed in the core fixing plate (2), and a plurality of first limiting blocks (22) are slidably connected to the limiting holes (21) along the mold opening direction. The plurality of connecting rods (311) respectively pass through the limiting holes (21) and are fixedly connected to the plurality of first limiting blocks (22). The driving assembly (33) is used to drive the sliding of the plurality of ejector pins (32) and the plurality of ejector blocks (31) respectively.

2. The secondary ejection and demolding structure of an injection molding die according to claim 1, characterized in that: The driving assembly (33) includes an ejector pin plate (331) and an elastic member (332). The ejector pin plate (331) is slidably connected to the core fixing plate (2) along the mold opening direction. One end of each of the plurality of ejector pins (32) away from the core plate (1) is fixedly connected to the ejector pin plate (331). The elastic member (332) is arranged on the core fixing plate (2), and the elastic member (332) always drives the connecting rod (311) to slide towards the core plate (1) side.

3. The secondary ejection and demolding structure of an injection molding die according to claim 2, characterized in that: The ejector pin plate (331) is provided with a plurality of limiting cavities (3311), and a plurality of second limiting blocks (3312) are slidably connected to the plurality of limiting cavities (3311) respectively. The plurality of second limiting blocks (3312) are respectively fixedly connected to the plurality of connecting rods (311). Two ends of the elastic member (332) respectively abut against the second limiting blocks (3312) and the core fixing plate (2).

4. The secondary ejection and demoulding structure of an injection moulding die according to claim 3, wherein: A plurality of guide posts (23) are arranged on the core fixing plate (2), and the plurality of guide posts (23) respectively pass through the ejector pin plate (331).

5. The secondary ejection and demolding structure of an injection molding die according to claim 2, characterized in that: The plurality of ejector blocks (31) are respectively located in the middle part of the formed product, and the plurality of ejector pins (32) are evenly distributed along the edge part of the formed product.

6. The secondary ejection and demoulding structure of an injection moulding die according to claim 2, characterized in that: The ejector pin plate (331) is provided with a limiting post (3313). When the ejector pin plate (331) slides towards the core plate (1) side to the limit position, the limiting post (3313) abuts against the core plate (1).

7. The secondary ejection and demolding structure of an injection molding die according to claim 1, characterized in that: A mating surface (3111) is arranged on the circumferential side surface of the connecting rod (311), and a mating block (11) which can cooperate with the connecting rod (311) is arranged on the core plate (1). The connecting rod (311) passes through and is slidably connected to the mating block (11).

Images