A secondary ejection mold structure combining straight and angled ejectors

Abstract

This utility model discloses a secondary ejection mold structure combining straight and angled ejectors, comprising: a rear mold with a mold core; a large straight ejector block, a large angled ejector block, a small straight ejector block, and a small angled ejector block, which are slidably assembled on both sides of the mold core; an ejector pin structure including a lower ejector plate and an upper ejector plate, the upper ejector plate being stacked on the lower ejector plate and slidably disposed together on the rear side of the rear mold, the first ejector pin on the lower ejector plate engaging with the large straight or large angled ejector block, the second ejector pin on the upper ejector plate engaging with the small straight or small angled ejector block, and ejector pins for lifting the ejector pin structure being driven on the rear mold base plate; a linkage block, the middle of which is rotatably disposed on the lower ejector plate, and its ends extending to the top and bottom surfaces of the upper ejector plate respectively; and a front mold with a mold cavity. This utility model can solve the problems of exposed parting lines in injection molded parts produced by existing injection molds, which affect aesthetics and molding quality, and the complex mold structure, which increases equipment costs and maintenance difficulty.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically a secondary ejection mold structure combining a straight ejector and an angled ejector. Background Technology

[0002] Currently, for products with irregular shapes and surfaces, such as car bumpers, the parting lines on the surface of the finished product are exposed after injection molding. Even after assembly, they remain visible on the outside of the product, affecting the aesthetics of the car. The demolding efficiency and molding quality of injection molded parts are also poor. The demolding and ejection structures of injection molds are relatively complex, requiring a large number of corresponding drive devices, which increases the difficulty of equipment maintenance and equipment costs. Utility Model Content

[0003] The purpose of this utility model is to solve the problems of exposed parting lines on the surface of injection molded parts produced by existing injection molds, which affect the aesthetics, poor demolding efficiency and molding quality, and complex mold structure, which increases the difficulty of equipment maintenance and equipment cost. Therefore, this utility model provides a secondary ejection mold structure that combines straight ejector and angled ejector.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a secondary ejection mold structure combining straight and angled ejectors, comprising:

[0005] The rear mold is mounted on the rear mold base plate by means of a side plate, and the mold core is mounted on it;

[0006] The large straight ejector block slides and fits into the top of both sides of the mold core, and its outer surface slides and embeds into the small straight ejector block and the small inclined ejector block;

[0007] The large inclined ejector block slides and fits into the bottom sides of the mold core, and its top is smoothly fitted into the large straight ejector block. The outer surfaces of the mold core, large straight ejector block, small straight ejector block, small inclined ejector block, and large inclined ejector block match the inner surface of the U-shaped product.

[0008] The ejector pin structure includes a lower ejector pin plate and an upper ejector pin plate. The upper ejector pin plate is stacked on the lower ejector pin plate and slidably disposed together in the cavity formed by the side plate enclosure. Several first ejector pins extend from the lower ejector pin plate and slide through the upper ejector pin plate and the mold core. The first ejector pins are in contact with the large straight ejector block or the large angled ejector block. Several second ejector pins extend from the upper ejector pin plate and slide through the mold core. The second ejector pins are in contact with the small straight ejector block or the small angled ejector block. The rear mold base plate is driven to provide a push post for lifting the ejector pin structure.

[0009] The linkage block has a V-shaped structure and is rotatably disposed in the movable groove of the lower ejector plate. One end of the block extends to the top of the upper ejector plate, and the other end abuts against the bottom surface of the upper ejector plate.

[0010] A front mold having a cavity that matches the outer surface of the product.

[0011] As a further description of the above technical solution:

[0012] The large straight ejector block and the small straight ejector block slide along the axis of the rear mold, while the small inclined ejector block and the large inclined ejector block slide at an angle relative to the axis of the rear mold.

[0013] As a further description of the above technical solution:

[0014] The first ejector pin is positioned on the large straight ejector block or can be slidably connected to the large inclined ejector block.

[0015] As a further description of the above technical solution:

[0016] The second ejector pin is positioned on the small straight ejector block or can be slidably connected to the small angled ejector block.

[0017] As a further description of the above technical solution:

[0018] The lower ejector plate has a positioning buckle structure on its side. The positioning buckle structure includes a connecting block and a vertical rod. The connecting block is positioned on the lower ejector plate. The vertical rod is connected to the connecting block. A second buckle and a first buckle are respectively provided on the opposite surface of the vertical rod and the front mold. The first buckle abuts against the end face of the second buckle near the lower ejector plate. At least one of the first buckle and the second buckle is driven to telescopically move and connect to the surface of the corresponding structure.

[0019] As a further description of the above technical solution:

[0020] The rear mold is provided with a guide sleeve on its side, and the upright is slidably inserted through the guide sleeve.

[0021] In summary, by adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0022] This utility model discloses a mold structure for injection molding production of automotive bumpers. During use, the structure of two lifting plates combined with a linkage block allows for secondary ejection of the ejector block during the lifting of the ejector pin structure. The product can be demolded in stages solely through the drive of the ejector pin structure, reducing the use of drive equipment, lowering costs, and reducing equipment complexity. Based on the secondary ejection design of the ejector pin structure, the combination of straight and angled ejector structures further improves the demolding efficiency and molding quality of U-shaped and irregularly shaped surface products. The lifting method of the ejector pin structure adopts a two-stage approach. In the early stage of mold opening, the ejector pin structure moves together with the front mold to achieve lifting; in the later stage, the lifting is driven by the ejector pins of the rear mold, reducing mold energy consumption. The design of placing the pulling, ejection, and auxiliary demolding structures inside the product, along with the set structural running direction, allows the parting line of the injection-molded product to be hidden inside the product, improving the product's aesthetics and molding quality. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a secondary ejection mold structure that combines a straight ejector and an angled ejector.

[0025] Figure 2 This is an exploded view of a secondary ejection mold structure that combines a straight ejector and an angled ejector.

[0026] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0027] Figure 4 This is an exploded view of the ejector pin structure and linkage block in a secondary ejection mold structure that combines straight and angled ejectors.

[0028] Figure 5 This is a reference for the usage of a two-stage ejection mold structure combining straight and angled ejectors. Figure 1 .

[0029] Figure 6 This is a reference for the usage of a two-stage ejection mold structure combining straight and angled ejectors. Figure 2 .

[0030] Legend:

[0031] 1. Rear mold; 2. Side plate; 3. Rear mold base plate; 4. Mold core; 5. Large straight ejector block; 6. Small straight ejector block; 7. Small angled ejector block; 8. Large angled ejector block; 9. Lower ejector plate; 10. Upper ejector plate; 11. Linkage block; 12. Movable groove; 13. Front mold; 14. Connecting block; 15. Vertical rod; 16. First latch; 17. Second latch; 18. Guide sleeve; 100. Product. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0033] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Please see Figure 1-6 This utility model provides a technical solution: a secondary ejection mold structure combining straight and angled ejectors, comprising:

[0035] The rear mold 1 is mounted on the rear mold base plate 3 by means of the side plate 2, and the mold core 4 is mounted on it;

[0036] The large straight ejector block 5 is slidably assembled on both sides of the top of the mold core 4, and its outer surface is slidably embedded with the small straight ejector block 6 and the small inclined ejector block 7;

[0037] The large inclined ejector block 8 slides and fits into the bottom sides of the mold core 4, and its top is smoothly fitted into the large straight ejector block 5. The outer surfaces of the mold core 4, the large straight ejector block 5, the small straight ejector block 6, the small inclined ejector block 7, and the large inclined ejector block 8 match the inner surface of the U-shaped product 100.

[0038] The ejector pin structure includes a lower ejector plate 9 and an upper ejector plate 10. The upper ejector plate 10 is stacked on the lower ejector plate 9 and slidably disposed together within the cavity formed by the side plate 2. Several first ejector pins extend from the lower ejector plate 9 and slide through the upper ejector plate 10 and the mold core 4. The first ejector pins are in contact with the large straight ejector block 5 or the large inclined ejector block 8. Several second ejector pins extend from the upper ejector plate 10 and slide through the mold core 4. The second ejector pins are in contact with the small straight ejector block 6 or the small inclined ejector block 7. A pusher (not shown in the figure) is driven and disposed on the rear mold base plate 3 for lifting the ejector pin structure.

[0039] Linkage block 11 has a V-shaped structure and is rotatably disposed in the movable groove 12 of the lower ejector plate 9. One end of it extends above the upper ejector plate 10, and the other end abuts against the bottom surface of the upper ejector plate 10.

[0040] The front mold 13 has a cavity that matches the outer surface of the product 100.

[0041] The large straight ejector block 5 and the small straight ejector block 6 slide along the axis of the rear mold 1, while the small inclined ejector block 7 and the large inclined ejector block 8 slide at an angle relative to the axis of the rear mold 1. Through the lifting ejector pin structure, the large straight ejector block 5 pushes the two sides of the product 100 upwards, causing it to initially separate from the mold core 4, completing the initial demolding. Simultaneously, the large inclined ejector block 8 slides inwards to separate from the side edge of the product 100, performing side core pulling to avoid obstructing the upward movement of the product 100 and causing friction between structures, thus affecting demolding efficiency and molding quality. Afterwards, the ejector pin structure continues to lift. One end of the linkage block 11 abuts against the bottom surface of the rear mold 1 and rotates relative to the lower ejector plate 9, while the other end lifts the upper ejector plate 10 for a secondary lifting. By ejecting the small straight ejector block 6 and the small inclined ejector block 7, the product 100 is separated from the large straight ejector block 5, ultimately completing the demolding. The secondary ejection design based on the ejector pin structure, through the combination of straight ejector and angled ejector structures, can further improve the demolding efficiency and molding quality of U-shaped and irregularly shaped surface products.

[0042] The first ejector pin is positioned on the large straight ejector block 5 or can be slidably connected to the large angled ejector block 8. The second ejector pin is positioned on the small straight ejector block 6 or can be slidably connected to the small angled ejector block 7.

[0043] The lower ejector plate 9 has a positioning buckle structure on its side, which includes a connecting block 14 and a vertical rod 15. The connecting block 14 is positioned on the lower ejector plate 9, and the vertical rod 15 abuts against the connecting block 14. A second latch 17 and a first latch 16 are respectively provided on the opposite surface of the vertical rod 15 and the front mold 13. The first latch 16 abuts against the end face of the second latch 17 near the lower ejector plate 9. At least one of the first latch 16 and the second latch 17 is driven to telescopically connect to the surface of the corresponding structure. The rear mold 1 has a guide sleeve 18 on its side, and the vertical rod 15 slides through the guide sleeve 18.

[0044] The working principle of the secondary ejection mold structure combining direct and angled ejectors in this embodiment includes: The mold structure of this utility model is used for injection molding production of automobile bumpers. In use, the front mold 13 is driven to move, disengaging it from the rear mold 1. At this time, the first locking buckle 16 and the second locking buckle 17 are exposed on their respective structural surfaces, achieving abutment locking. The ejector pin structure (lower ejector plate 9, upper ejector plate 10) moves synchronously with the front mold 13; as... Figure 5 As shown (where the upward movement of the ejector pin structure and the positioning buckle structure is not shown in the figure, only the direction of structural movement is indicated by arrows), the large straight ejector block 5 is pushed upward by the first ejector pin (with... Figure 5 The upper part of the product 100 is pushed upwards, causing the two sides of the product 100 to detach from the mold core 4. The large inclined ejector block 8 is pushed upwards by the first ejector pin and moves along the inclined direction guided by the wedge structure on the side of the mold core 4. It retracts and detaches from the side of the product 100. Before this, the inward pulling force of the product 100 also causes the side edge of the product 100 to detach from the side of the mold cavity of the front mold 13, thus demolding and separating the two. Afterwards, the first latch 16 and the second latch 17 are driven to retract into the corresponding structural surfaces, and their positioning state is released. The connection between the front mold 13 and the lower ejector plate 9 is released, and the front mold 13 moves away from the rear mold 1. The ejector pins on the rear mold base plate 3 continue to push the ejector structure upward until the linkage block 11 contacts the bottom surface of the rear mold 1. One end of the linkage block 11 is pressed and rotates along the lower ejector plate 9, while the other end pushes the upper ejector plate 10 upward, separating the two ejector plates. The second ejector pin pushes the small straight ejector block 6 and the small inclined ejector block 7 upward or inclined, respectively, so that both ends of the product 100 are separated from the large straight ejector block 5, thereby achieving complete demolding of the product 100. After that, the product 100 can be removed. For details, please refer to [reference needed]. Figure 6 (The structural states where the ejector pin structure and the positioning buckle structure move upwards, and the lower ejector plate 9 and the upper ejector plate 10 separate due to the action of the linkage block 11, are not shown in the figure; only the direction of structural movement is indicated by arrows.) Through the above-mentioned design of the mold pulling, ejection, and auxiliary demolding structures located inside the product, and the set structural running direction, the parting line of the injection molded product is hidden inside the product, thereby improving the product's aesthetics and molding quality.

[0045] In summary, due to the adoption of the above technical solutions, the secondary ejection mold structure combining direct and angled ejectors in this embodiment has the following advantages compared to the prior art:

[0046] This utility model discloses a mold structure for injection molding production of automotive bumpers. During use, the structure of two lifting plates combined with a linkage block allows for secondary ejection of the ejector block during the lifting of the ejector pin structure. The product can be demolded in stages solely through the drive of the ejector pin structure, reducing the use of drive equipment, lowering costs, and reducing equipment complexity. Based on the secondary ejection design of the ejector pin structure, the combination of straight and angled ejector structures further improves the demolding efficiency and molding quality of U-shaped and irregularly shaped surface products. The lifting method of the ejector pin structure adopts a two-stage approach. In the early stage of mold opening, the ejector pin structure moves together with the front mold to achieve lifting; in the later stage, the lifting is driven by the ejector pins of the rear mold, reducing mold energy consumption. The design of placing the pulling, ejection, and auxiliary demolding structures inside the product, along with the set structural running direction, allows the parting line of the injection-molded product to be hidden inside the product, improving the product's aesthetics and molding quality.

[0047] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A secondary ejection mold structure combining straight and angled ejectors, characterized in that, include: The rear mold is mounted on the rear mold base plate by means of a side plate, and the mold core is mounted on it; The large straight ejector block slides and fits into the top of both sides of the mold core, and its outer surface slides and embeds into the small straight ejector block and the small inclined ejector block; The large inclined ejector block slides and fits into the bottom sides of the mold core, and its top is smoothly fitted into the large straight ejector block. The outer surfaces of the mold core, large straight ejector block, small straight ejector block, small inclined ejector block, and large inclined ejector block match the inner surface of the U-shaped product. The ejector pin structure includes a lower ejector pin plate and an upper ejector pin plate. The upper ejector pin plate is stacked on the lower ejector pin plate and slidably disposed together in the cavity formed by the side plate enclosure. Several first ejector pins extend from the lower ejector pin plate and slide through the upper ejector pin plate and the mold core. The first ejector pins are in contact with the large straight ejector block or the large angled ejector block. Several second ejector pins extend from the upper ejector pin plate and slide through the mold core. The second ejector pins are in contact with the small straight ejector block or the small angled ejector block. The rear mold base plate is driven to provide a push post for lifting the ejector pin structure. The linkage block has a V-shaped structure and is rotatably disposed in the movable groove of the lower ejector plate. One end of the block extends to the top of the upper ejector plate, and the other end abuts against the bottom surface of the upper ejector plate. A front mold having a cavity that matches the outer surface of the product.

2. The secondary ejection mold structure combining straight and angled ejectors according to claim 1, characterized in that, The large straight ejector block and the small straight ejector block slide along the axis of the rear mold, while the small inclined ejector block and the large inclined ejector block slide at an angle relative to the axis of the rear mold.

3. The secondary ejection mold structure combining straight and angled ejectors according to claim 2, characterized in that, The first ejector pin is positioned on the large straight ejector block or can be slidably connected to the large inclined ejector block.

4. The secondary ejection mold structure combining straight and angled ejectors according to claim 2, characterized in that, The second ejector pin is positioned on the small straight ejector block or can be slidably connected to the small angled ejector block.

5. The secondary ejection mold structure combining straight and angled ejectors according to claim 1, characterized in that, The lower ejector plate has a positioning buckle structure on its side. The positioning buckle structure includes a connecting block and a vertical rod. The connecting block is positioned on the lower ejector plate. The vertical rod is connected to the connecting block. A second buckle and a first buckle are respectively provided on the opposite surface of the vertical rod and the front mold. The first buckle abuts against the end face of the second buckle near the lower ejector plate. At least one of the first buckle and the second buckle is driven to telescopically move and connect to the surface of the corresponding structure.

6. The secondary ejection mold structure combining straight and angled ejectors according to claim 5, characterized in that, The rear mold is provided with a guide sleeve on its side, and the upright is slidably inserted through the guide sleeve.

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