An automatic demolding structure for plastic products with raised rings

Abstract

This utility model discloses an automatic demolding structure for a mold of a plastic product with a raised ring. It includes a moving mold and a stationary mold arranged vertically opposite each other. The moving mold includes a top plate, an upper template connected to the bottom surface of the top plate, and an upper mold core disposed on the bottom surface of the upper template. The stationary mold includes a bottom plate, a lower template connected to the top of the bottom plate, and a lower mold core disposed on the top surface of the lower template. A first forming block is movably mounted on one side of the lower mold core on the lower template, and a second forming block is movably mounted on the other side of the lower template. A forming cavity is formed between the upper mold core, the lower mold core, and the first forming block. A first insert extending into the cavity is inserted into the side of the first forming block, and a second insert passing through the lower mold core and extending into the cavity is connected to the side of the second forming block. A first lever is disposed on one side of the bottom surface of the upper template, and a second lever is disposed on the other side of the bottom surface of the upper template. This utility model has a simple structure, small mold volume, eliminates the need for a power assembly such as a hydraulic cylinder, has low manufacturing cost, and is easy to maintain.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an automatic demolding structure for a mold of a plastic product with a raised ring. Background Technology

[0002] Currently, plastic products with raised rings on their outer walls are widely used in daily life. These products are usually injection molded. After injection molding, plastic products with raised rings need to be demolded for easy removal. Common demolding mechanisms in injection molds include core-pulling demolding mechanisms and ejector pin demolding mechanisms. However, for plastic products with raised rings, because the raised rings interlock with the side of the mold core, it is difficult to demold using general core-pulling demolding mechanisms and ejector pin demolding mechanisms.

[0003] To address the difficulty in demolding plastic products with raised rings, existing injection molds have adopted a side-sliding demolding mechanism. This involves installing a hydraulic cylinder on each side of the mold. During demolding, the cylinders first drive a movable module that contacts the side of the plastic part to slide to both sides. Once the movable module detaches from the product, the product is removed. However, this side-sliding demolding mechanism requires two hydraulic cylinders and associated sliding components, leading to a larger mold size, more complex mold structure, and higher manufacturing costs. Furthermore, the numerous pipes in the hydraulic cylinders make them prone to failure, oil leaks, and maintenance difficulties. Utility Model Content

[0004] The purpose of this utility model is to provide an automatic demolding structure for molds of plastic products with raised rings. It has a simple structure and small mold volume; it does not require a power assembly such as a hydraulic cylinder, has low manufacturing cost, and is easy to maintain, so as to solve the problems of complex side-sliding demolding mechanisms, high manufacturing cost, and troublesome maintenance of molds mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An automatic demolding structure for a mold of a plastic product with a raised ring includes a moving mold and a stationary mold arranged vertically opposite each other. The moving mold includes a top plate, an upper template connected to the bottom surface of the top plate, and an upper mold core disposed on the bottom surface of the upper template. The stationary mold includes a bottom plate, a lower template connected to the top surface of the bottom plate, and a lower mold core disposed on the top surface of the lower template. A first forming block is movably disposed on one side of the lower mold core, and a second forming block is movably disposed on the other side of the lower mold core. A forming cavity is formed between the upper mold core, the lower mold core, and the first forming block. A first insert extending into the cavity is inserted into the side of the first forming block, and a second insert passing through the lower mold core and extending into the cavity is connected to the side of the second forming block. A first lever is disposed on one side of the bottom surface of the upper template, and a second lever is disposed on the other side of the bottom surface of the upper template.

[0007] Preferably, the bottom surface of the upper template is provided with an installation groove, the top end of the first lever is fixed to one side of the top wall of the installation groove, and the bottom end of the first lever extends downward at an incline to the outside of the installation groove; the top surface of the first forming block is provided with a first sliding hole extending downward at an incline, and the bottom end of the first lever is slidably inserted into the first sliding hole.

[0008] Preferably, the top end of the second lever is fixed to the other side of the top wall of the mounting groove opposite to the first lever, and the bottom end of the second lever is bent away from the upper mold core to form a bent portion extending out of the mounting groove; the top surface of the second molding block is provided with a second sliding hole extending downward at an inclination, and the bottom end of the second lever is slidably inserted into the second sliding hole.

[0009] Preferably, the top surface of the lower template has a receiving groove on one side of the lower mold core, and guide grooves are formed on both sides of the receiving groove.

[0010] Preferably, the first molding block includes a base portion and a molding portion; the base portion has guide rails adapted to the guide groove on both sides of its bottom end, and a stepped opening for installing the molding portion is formed at one end of the base portion.

[0011] Preferably, both the base portion and the molding portion end face are provided with molding grooves for matching convex ring plastic parts, and the molding portion has a through hole that extends horizontally through its end wall, and the second insert is inserted into the through hole.

[0012] Preferably, the top surface of the lower template is provided with two fixing blocks on the side of the lower mold core opposite to the first forming block, and the second forming block is movably disposed between the two fixing blocks.

[0013] Preferably, limiting portions that overlap the top surface of the fixed block are formed on both sides of the top of the second molding block.

[0014] Preferably, the side wall of the second molding block is provided with a sliding groove extending through its upper and lower surfaces, and the side wall of the sliding groove is provided with a limiting groove extending through the upper and lower surfaces of the second molding block.

[0015] Preferably, the second insert has a buckle protruding to one side from the end away from the upper mold core, and the buckle is movably disposed within the limiting groove.

[0016] Compared with the prior art, the beneficial effects of this utility model are: separation from the convex ring part of the convex ring plastic part can be achieved simply by the cooperation between the first lever and the first molding block, and the second lever and the second molding block, during mold opening; the first lever, the second lever, the first molding block, the second molding block, the first insert, and the second insert are all set inside the mold; its structure is simple and the mold volume is small; there is no need to set up a power assembly such as a hydraulic cylinder, the manufacturing cost is low, and maintenance is convenient, requiring only the direct replacement of the corresponding parts during maintenance. Attached Figure Description

[0017] Figure 1 This is a perspective view of the convex ring plastic part of this utility model;

[0018] Figure 2 This is a perspective view of the automatic demolding structure of the mold for plastic products with raised rings according to this utility model.

[0019] Figure 3 This is a cross-sectional view of the automatic demolding structure for plastic products with raised rings according to this utility model;

[0020] Figure 4 This is a cross-sectional view of the present invention in the mold-opening state;

[0021] Figure 5 This is a perspective view of the moving model of this utility model;

[0022] Figure 6 This is a perspective view of the static mold of this utility model;

[0023] Figure 7 This is an exploded view of the static mold of this utility model;

[0024] Figure 8 This is a perspective view of the first molding block of this utility model;

[0025] Figure 9 This is a schematic diagram of the structure of the second molding block and the second insert of this utility model.

[0026] The corresponding reference numerals in the figure are as follows: 1. Convex ring plastic part; 11. Convex ring part; 2. Moving mold; 21. Top plate; 22. Upper template; 221. Mounting groove; 23. Upper mold core; 24. First lever; 25. Second lever; 251. Bending part; 26. Second insert; 261. Buckle; 3. Stationary mold; 31. Base plate; 32. Lower template; 321. Receiving groove; 322. Guide groove; 33. Lower mold core; 34. First molding block; 341. First sliding hole; 342. Seat part; 343. Molding part; 344. Guide rail; 345. Step opening; 346. Molding groove; 35. Second molding block; 351. Second sliding hole; 352. Limiting part; 353. Sliding groove; 354. Limiting groove; 36. First insert; 37. Fixing block. Detailed Implementation

[0027] 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 protection scope of the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "more than" means two or more, unless otherwise explicitly specified. In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Please see Figure 1-9 An automatic demolding structure for a mold of a plastic product with a raised ring includes a moving mold 2 and a stationary mold 3 that are positioned vertically opposite each other. The moving mold 2 includes a top plate 21, an upper template 22 connected to the bottom surface of the top plate 21, and an upper mold core 23 disposed on the bottom surface of the upper template 22. The stationary mold 3 includes a bottom plate 31, a lower template 32 connected to the top surface of the bottom plate 31, and a lower mold core 33 disposed on the top surface of the lower template 32. The bottom surface of the upper template 22 abuts against the top surface of the lower template 32 to facilitate mold opening and closing.

[0030] Please see Figure 1 as well as Figure 3A first molding block 34 is movably disposed on one side of the lower mold core 33, and a second molding block 35 is movably disposed on the other side of the lower mold core 33. A molding cavity is formed between the upper mold core 23, the lower mold core 33, and the first molding block 34, and a convex ring plastic part 1 is injection molded within the cavity. A first insert 36 extending into the cavity is inserted into the side of the first molding block 34, and a second insert 26 passing through the lower mold core 33 and extending into the cavity is connected to the side of the second molding block 35. In this embodiment, the ends of the first insert 36 and the second insert 26 cover the convex ring portion 11 of the convex ring plastic part 1. A first lever 24 for horizontally moving the first molding block 34 is disposed on one side of the bottom surface of the upper mold 22, and a second lever 25 for horizontally moving the second molding block 35 is disposed on the other side of the bottom surface of the upper mold 22.

[0031] Please see Figure 4 When the mold opens, the moving mold 2 moves upward relative to the stationary mold 3. When the first lever 24 moves upward, it drives the first molding block 34 and the first insert 36 to move horizontally away from the cavity, so that the first insert 36 separates from the convex ring portion 11 of the convex ring plastic part 1. At the same time, when the second lever 25 moves upward, it drives the second molding block 35 and the second insert 26 to move horizontally away from the cavity, so that the second insert 26 separates from the convex ring portion 11 of the convex ring plastic part 1. The convex ring plastic part 1, which is not restricted by the first insert 36 and the second insert 26, can be quickly demolded.

[0032] Therefore, this utility model only requires the cooperation between the first lever 24 and the first molding block 34, and the second lever 25 and the second molding block 35, during mold opening to separate the protruding ring part 11 from the protruding ring plastic part 1. The first lever 24, the second lever 25, the first molding block 34, the second molding block 35, the first insert 36, and the second insert 26 are all set inside the mold. Its structure is simple and the mold volume is small. There is no need to set up a power assembly such as a hydraulic cylinder, the manufacturing cost is low, and the maintenance is convenient. During maintenance, only the corresponding parts need to be replaced directly, and the maintenance cost is low.

[0033] Please see Figure 4-6The upper template 22 has a mounting groove 221 on its bottom surface. The upper mold core 23 is embedded in the middle of the top wall of the mounting groove 221. The top end of the first lever 24 is fixed to one side of the top wall of the mounting groove 221, and the bottom end of the first lever 24 extends downward at an incline to the outside of the mounting groove 221. The top surface of the first forming block 34 has a first sliding hole 341 extending downward at an incline, and the bottom end of the first lever 24 is slidably inserted into the first sliding hole 341. The top end of the second lever 25 is fixed to the other side of the top wall of the mounting groove 221 opposite to the first lever 24, and the bottom end of the second lever 25 is bent away from the upper mold core 23 to form a bent portion 251 extending out of the mounting groove 221. The top surface of the second forming block 35 has a second sliding hole 351 extending downward at an incline, and the bottom end of the second lever 25 is slidably inserted into the second sliding hole 351.

[0034] In this embodiment, the first lever 24 is a cylindrical lever and the first sliding hole 341 is a cylindrical hole; the bent portion 251 of the second lever 25 is a square lever and the second sliding hole 351 is a square hole; however, this utility model does not limit the shape of the first lever 24, the first sliding hole 341, the second lever 25 and the second sliding hole 351, and can also be set to other geometric shapes according to the actual situation.

[0035] Please see Figure 4 When the mold is opened, the first lever 24 presses the inner wall of the first sliding hole 341 with its bottom end as it rises, thereby causing the first molding block 34 and the first insert 36 to move horizontally to the left, so that the first insert 36 separates from the left side of the convex ring portion 11 of the convex ring plastic part 1; the second lever 25 presses the inner wall of the second sliding hole 351 with its bottom end as it rises, thereby causing the second molding block 35 and the second insert 26 to move horizontally to the right, so that the second insert 26 separates from the right side of the convex ring portion 11 of the convex ring plastic part 1.

[0036] Please see Figure 7-8 The lower template 32 has a receiving groove 321 on one side of the lower mold core 33 on its top surface, and guide grooves 322 are formed on both sides of the receiving groove 321. The first molding block 34 includes a base part 342 and a molding part 343. A first sliding hole 341 is provided on the base part 342. Guide rails 344 adapted to the guide grooves 322 are provided on both sides of the bottom end of the base part 342. A stepped opening 345 for installing the molding part 343 is formed at one end of the base part 342. In this embodiment, the end faces of the base part 342 and the molding part 343 are provided with molding grooves 346 that match the convex ring plastic part 1. The molding part 343 has a through hole that extends horizontally to its end wall, and the second insert 26 is inserted into the through hole.

[0037] Please see Figure 7 as well as Figure 9Two fixing blocks 37 are provided on the top surface of the lower mold plate 32 on the side of the lower mold core 33 opposite to the first forming block 34. The second forming block 35 is movably disposed between the two fixing blocks 37. Limiting portions 352 that overlap the top surfaces of the fixing blocks 37 are formed on both sides of the top of the second forming block 35. A sliding groove 353 is provided on the side wall of the second forming block 35, which extends to its upper and lower surfaces. A limiting groove 354 is provided on the side wall of the sliding groove 353, which extends to the upper and lower surfaces of the second forming block 35. A buckle 261 is formed on the end of the second insert 26 away from the upper mold core 23. The buckle 261 is movably disposed in the limiting groove 354. By setting the buckle 261, the second forming block 35 can drive the second insert 26 to move horizontally.

[0038] Please see Figure 4 as well as Figure 9 When the mold is opened, the second molding block 35 first moves the second insert 26 to the right through the limiting groove 354 so that the end of the second insert 26 is separated from the convex ring part 11 of the convex ring plastic part 1; then the upper mold core 23 drives the second insert 26 to rise. During this process, the slide groove 353 and the limiting groove 354 guide the second insert 26 to move upward until the second insert 26 is completely separated from the second molding block 35.

[0039] Please see Figure 3 as well as Figure 6 A lifting ejector plate (not shown in the figure) is mounted on the base plate 31. A plurality of ejector pins (not shown in the figure) are mounted on the top surface of the ejector plate. These ejector pins pass upward through the lower mold plate 32 and the lower mold core 33 and abut against the bottom surface of the convex ring plastic part 1, thereby ejecting the convex ring plastic part 1 from the lower mold core 33 for easy removal of the product. A power device is mounted on the base plate 31 to drive the lifting and lowering of the ejector plate. In this embodiment, the power device is a pneumatic cylinder or a hydraulic cylinder.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic demolding structure for a mold of a plastic product with a raised ring, comprising a moving mold (2) and a stationary mold (3) arranged vertically opposite each other, the moving mold (2) comprising a top plate (21), an upper template (22) connected to the bottom surface of the top plate (21), and an upper mold core (23) disposed on the bottom surface of the upper template (22), the stationary mold (3) comprising a bottom plate (31), a lower template (32) connected to the top surface of the bottom plate (31), and a lower mold core (33) disposed on the top surface of the lower template (32), characterized in that: The lower template (32) has a first forming block (34) movable on one side of the lower mold core (33), and the lower template (32) has a second forming block (35) movable on the other side of the lower mold core (33). The upper mold core (23), the lower mold core (33) and the first forming block (34) form a cavity. A first insert (36) extending into the cavity is inserted into the side of the first forming block (34). A second insert (26) passing through the lower mold core (33) and extending into the cavity is connected to the side of the second forming block (35). A first lever (24) is provided on one side of the bottom surface of the upper template (22), and a second lever (25) is provided on the other side of the bottom surface of the upper template (22).

2. The automatic demolding structure for plastic products with raised rings according to claim 1, characterized in that: The bottom surface of the upper template (22) is provided with an installation groove (221), the top end of the first lever (24) is fixed to one side of the top wall of the installation groove (221), and the bottom end of the first lever (24) extends downward at an incline to the outside of the installation groove (221); the top surface of the first forming block (34) is provided with a first sliding hole (341) extending downward at an incline, and the bottom end of the first lever (24) is slidably inserted into the first sliding hole (341).

3. The mold automatic demolding structure of a plastic product with a convex ring according to claim 2, characterized in that: The top end of the second lever (25) is fixed to the other side of the top wall of the mounting groove (221) opposite to the first lever (24). The bottom end of the second lever (25) is bent away from the upper mold core (23) to form a bent part (251) extending out of the mounting groove (221). The top surface of the second molding block (35) is provided with a second sliding hole (351) extending downward at an inclination. The bottom end of the second lever (25) is slidably inserted into the second sliding hole (351).

4. The mold automatic demolding structure for a plastic product with a convex ring according to claim 1, characterized by: The top surface of the lower template (32) is provided with a receiving groove (321) on one side of the lower mold core (33), and guide grooves (322) are formed on both sides of the receiving groove (321).

5. The mold automatic demolding structure of a plastic product with a convex ring according to claim 4, characterized in that: The first molding block (34) includes a base part (342) and a molding part (343); the base part (342) has guide rails (344) adapted to the guide groove (322) on both sides of its bottom end, and a stepped opening (345) for installing the molding part (343) is formed at one end of the base part (342).

6. The mold automatic demolding structure of a plastic product with a convex ring according to claim 5, characterized in that: The end faces of the base part (342) and the molding part (343) are provided with molding grooves (346) for matching the convex ring plastic part (1). The molding part (343) has a through hole that extends horizontally through to its end wall, and the second insert (26) is inserted into the through hole.

7. The mold automatic demolding structure for a plastic product with a convex ring according to any one of claims 1 to 6, characterized by: The top surface of the lower template (32) is provided with two fixing blocks (37) on the side of the lower mold core (33) opposite to the first forming block (34), and the second forming block (35) is movably disposed between the two fixing blocks (37).

8. The mold automatic demolding structure of a plastic product with a convex ring according to claim 7, characterized in that: The second molding block (35) has limiting parts (352) that overlap the top surface of the fixing block (37) on both sides of its top end.

9. The automatic demolding structure for a plastic product with a raised ring according to claim 7, characterized in that: The second molding block (35) has a sliding groove (353) extending through its upper and lower surfaces on its side wall, and the sliding groove (353) has a limiting groove (354) extending through its upper and lower surfaces on its side wall.

10. The mold automatic demolding structure of a plastic product with a convex ring according to claim 9, characterized in that: The second insert (26) has a buckle (261) protruding to one side from the end away from the upper mold core (23), and the buckle (261) is movably disposed in the limiting groove (354).

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