Inverted buckle demolding mechanism and injection mold

Abstract

The invention belongs to the technical field of injection molding equipment, and provides an inverted buckle demolding mechanism and an injection mold.The inverted buckle demolding mechanism comprises a sliding block assembly which comprises a sliding block and a driving part, the sliding block can move on a movable mold block, one end of the driving part is connected to a fixed mold block, and the other end of the driving part penetrates through the sliding block and is movably arranged on the movable mold block in a penetrating mode; the driving piece drives the sliding block to move on the movable module in the direction away from the product. The pulling assembly is arranged on the sliding block and comprises a pulling block, a guide sleeve and a pulling rod, the pulling block is in attached contact with the inner side of the product, a blind hole is formed in the sliding block, one end of the pulling rod extends into the blind hole, the other end of the pulling rod penetrates through the guide sleeve and is connected with the pulling block, a blocking part is arranged on the pulling rod, and when the sliding block moves, the guide sleeve moves along with the sliding block, and the guide sleeve is in contact with the blocking part of the pulling rod; the pulling block is driven to pull an inverted buckle on the inner side of the product for demolding; a product with limited internal space of the mold is demolded, and the inverted buckle on the inner side of the product can be demolded, so that normal demolding of the product is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of injection molding equipment, and in particular to an undercut demoulding mechanism and an injection mold. Background Art

[0002] The injection molding process refers to the process of making semi-finished products of a certain shape from molten raw materials through operations such as pressurization, injection, cooling, and separation. As a widely used and well-developed process, the injection molding process can give plastic products a complete structure and precise size. The process mainly includes six stages: mold closing, filling, pressure holding, cooling, mold opening, and demolding. These six stages directly determine the molding quality of the product.

[0003] In the development of injection molds, for the parts of the product that are not in the demolding direction, it is generally necessary to design a mechanism such as a lifter to achieve normal demolding of the product. However, for products with complex and compact internal structures, there is not enough space inside the mold to meet the design and layout of the lifter, which makes it difficult for the product to be demolded normally. Summary of the invention

[0004] In view of the above shortcomings of the prior art, the purpose of the present application is to provide an undercut demoulding mechanism and an injection mold, which are used to solve the problem in the prior art that products with limited internal space in the mold are difficult to demould and cannot be demoulded normally.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the present application provides an undercut demoulding mechanism, comprising:

[0006] A slider assembly is arranged between the fixed module and the movable module, the slider assembly includes a slider and a driving member, the slider can move on the movable module, one end of the driving member is connected to the fixed module, and the other end passes through the slider and is movably arranged on the movable module. When the movable module is separated from the fixed module, the driving member drives the slider to move on the movable module in a direction away from the product;

[0007] A pulling assembly is arranged on the slider, and the pulling assembly includes a pulling block, a guide sleeve and a pulling rod. The pulling block is at least partially in contact with the inner side of the product. A blind hole is provided on the slider, one end of the pulling rod extends into the blind hole, and the other end passes through the guide sleeve and is connected to the pulling block. A blocking part is provided on the pulling rod. When the slider moves, the guide sleeve moves with the slider, and the guide sleeve contacts the blocking part of the pulling rod to drive the pulling block to pull the inner side of the product for demoulding.

[0008] Optionally, the driving member is an inclined guide column that is arranged obliquely. When the mold is opened, the movable module moves in the direction away from the fixed module, and the inclined guide column drives the slider on the movable module to move in the direction away from the product. The inclined guide column is provided with a positioning block for positioning the inclined guide column at a position close to the fixed module.

[0009] Optionally, the pulling assemblies are provided in multiple groups, each group of the pulling assemblies further includes a connecting piece for fixing the guide sleeve, the connecting piece and the guide sleeve are both provided on the sliding block, each group of the pulling assemblies is provided with at least two pull rods and guide sleeves, one end of the pull rod passes through the guide sleeve and the connecting piece in sequence and is inserted into the pull block, and the pull block is also provided with a fastener connecting the pull rod to the pull block.

[0010] Optionally, the blind hole includes a first section and a second section, a first elastic member is provided on the first section of the blind hole, the pull rod extends into the first section of the blind hole, and after passing through the first elastic member, extends into the second section of the blind hole, and both ends of the first elastic member respectively abut against the blocking portion of the pull rod and the bottom of the first section of the blind hole.

[0011] Optionally, first guide blocks are arranged opposite to each other on the moving module, the sliding block is arranged between the first guide blocks, and mutually matching boss structures are arranged on opposite sides of the sliding block and the first guide blocks, and the boss structures are spliced ​​with each other to form a guide rail.

[0012] Optionally, the moving module is also provided with a limit block and a second guide block for limiting the stroke of the slider, the limit block blocks the moving path of the slider, the bottom of the slider is provided with a guide groove matching the second guide block, the slider is clamped on the second guide block through the guide groove, and when the slider moves on the moving module to the maximum stroke of the second guide block, the slider is blocked by the limit block and stops moving.

[0013] Optionally, a core-pulling structure for demoulding the outer side of the product is provided on the slider, and when the slider moves away from the product, the core-pulling structure is pulled out from the outer side of the product to demould the outer side of the product.

[0014] Optionally, a positioning clamp for positioning the slider is further provided on the moving module, and the positioning structure includes a fixed shaft and two clamping members, the fixed shaft is connected to the moving module, and the two clamping members can rotate around the fixed shaft. A positioning pin is provided at the bottom of the slider, and the clamping member has an arc-shaped clamping portion on a side close to the positioning pin. The clamping members are connected by a second elastic member, and the second elastic member sets the two clamping members in parallel, and the clamping portions enclose a positioning circle with an opening.

[0015] Based on the same inventive concept, the present invention also provides an injection mold, comprising:

[0016] Fixed module;

[0017] A movable module is arranged opposite to the fixed module, and the movable module can move relative to the fixed module to approach or move away from the fixed module, and both the fixed module and the movable module are provided with a mold core for molding products;

[0018] And the undercut demoulding mechanism as described above.

[0019] Optionally, a guide column is provided on the fixed module, and a guide hole is provided on the movable module, and the guide column extends into or withdraws from the guide hole to guide the movement of the movable module.

[0020] In the undercut demolding mechanism provided in the present application, when the movable module is separated from the fixed module, the driving member drives the slider to move in the movable module in a direction away from the product. During the movement of the slider, the slider is separated from the product, and the guide sleeve follows the slider to move until the guide sleeve contacts the blocking part of the pull rod. The slider continues to move to drive the pull block to pull the undercut on the inside of the product for demolding. For the demolding of products with limited internal space in the mold, there is no need to set up a tilted lift mechanism. The movement of the slider drives the pull block to pull the undercut on the inside of the product, so that the undercut on the inside of the product can be demolded, which reduces the difficulty of product demolding and ensures normal product demolding. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of an injection mold according to an embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of the assembly of the undercut demoulding mechanism and the movable module according to an embodiment of the present application;

[0023] Figure 3 A cross-sectional view of an injection mold shown in one embodiment of the present application;

[0024] Figure 4 for Figure 3 A magnified schematic diagram of the middle A area;

[0025] Figure 5 This is a schematic diagram of the assembly of an undercut demoulding mechanism and a fixed module according to an embodiment of the present application;

[0026] Figure 6 A partial structural schematic diagram of an undercut demoulding mechanism according to an embodiment of the present application;

[0027] Figure 7 This is a schematic structural diagram of a pulling assembly according to an embodiment of the present application.

[0028] Part Number Description

[0029] 1-fixed module; 2-moving module; 3-slider; 4-product; 5-inclined guide column; 6-guide column; 7-pull block; 8-pull rod; 9-first elastic member; 10-guide sleeve; 11-connecting member; 12-positioning clip; 13-positioning pin; 14-second elastic member; 15-fixed shaft; 16-second guide block; 17-limiting block; 18-first guide block; 19-boss structure; 20-core pulling structure; 21-positioning block; 22-blind hole; 23 blocking part. DETAILED DESCRIPTION

[0030] The following is an explanation of the implementation of the present application by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0031] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that can be implemented in this application, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in this application without affecting the effects that can be produced by this application and the purposes that can be achieved. At the same time, the terms such as "front", "back", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of narration, and are not used to limit the scope of the implementation of this application. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of this application without substantial changes in the technical content.

[0032] It should be noted that in the development of plastic molds, for the parts of the product that are not in the demolding direction, it is necessary to design core-pulling mechanisms such as inclined ejectors to achieve normal demolding of the product. However, for products with complex and compact structures, there is not enough space inside the mold to meet the design and layout of the inclined ejectors, which makes it difficult for the product to be demolded and cannot be demolded normally.

[0033] See also Figures 1 to 7 The present application exemplarily provides an undercut demoulding mechanism, comprising:

[0034] The slider assembly is arranged between the fixed module 1 and the movable module 2. The slider assembly includes a slider 3 and a driving member. The slider 3 can move on the movable module 2. One end of the driving member is connected to the fixed module 1, and the other end passes through the slider 3 and is movably arranged on the movable module 2. When the movable module 2 is separated from the fixed module 1, the driving member drives the slider 3 to move on the movable module 2 in a direction away from the product 4;

[0035] The pulling assembly is arranged on the slider 3, and the pulling assembly includes a pulling block 7, a guide sleeve 10 and a pulling rod 8. The pulling block 7 is at least partially in contact with the inner side of the product 4. A blind hole 22 is provided on the slider 3. One end of the pulling rod 8 extends into the blind hole 22, and the other end passes through the guide sleeve 10 and is connected to the pulling block 7. A blocking portion 23 is provided on the pulling rod 8. When the slider 3 moves, the guide sleeve 10 moves with the slider 3 until the guide sleeve 10 contacts the blocking portion 23 of the pulling rod 8. The slider 3 continues to move to drive the pulling block 7 to pull the inner side of the product 4 to be undercut for demoulding.

[0036] In the undercut demolding mechanism provided in the present application, when the movable module 2 is separated from the fixed module 1, the driving member drives the slider 3 to move in the movable module 2 in the direction away from the product 4. During the movement of the slider 3, the slider 3 is separated from the product 4, and the guide sleeve 10 moves with the slider 3 until the guide sleeve 10 contacts the blocking portion 23 of the pull rod 8. The slider 3 continues to move to drive the pull block 7 to pull the inner side of the product 4 to demold. For the demolding of products with limited internal space in the mold, there is no need to set up a tilting mechanism. The movement of the slider 3 drives the pull block 7 to pull the inner side of the product 4 to demold the inner side of the product, thereby reducing the difficulty of product demolding and ensuring normal product demolding.

[0037] In this example, see Figure 2 and Figure 3 The driving member is an inclined guide column 5 which is arranged obliquely. When the mold is opened, the movable module 2 moves in a direction away from the fixed module 1, and the inclined guide column 5 drives the slide block 3 to move in a direction away from the product 4. The inclined guide column 5 is provided with a positioning block 21 for positioning the inclined guide column 5 at a position close to the fixed module 1. The positioning block 21 is arranged on the fixed module 1. The inclined guide column 5 is provided with a positioning groove which matches the positioning block 21. The positioning block 21 is clamped on the positioning groove. The inclined guide column 5 is positioned by the positioning block 21 to prevent the inclined guide column 5 from rotating or withdrawing during the movement of the movable module 2, so as to ensure that the slide block 3 can be driven normally. Specifically, an avoidance hole is provided on the movable module 2, and the inclined guide column 5 passes through the slide block 3 and extends into the avoidance hole of the movable module 2. When the mold is opened, the movable module 2 moves along the inclined guide column 5 in a direction away from the fixed module 1, and the inclined guide column 5 drives the slide block 3 to move on the movable module 2.

[0038] In some embodiments, Figure 4 , Figure 6 and Figure 7As shown, there are multiple groups of pulling components, each group of pulling components also includes a connecting piece 11 for fixing the guide sleeve 10, the connecting piece 11 and the guide sleeve 10 are both arranged on the slider 3, when the mold is closed, the connecting piece 11 is in contact with the part of the pull block 7 that is not in contact with the product 4, each group of pulling components is provided with at least two pull rods 8 and guide sleeves 10, one end of the pull rod 8 passes through the guide sleeve 10 and the connecting piece 11 in sequence and is inserted into the pull block 7, and the pull block 7 is also provided with a fastener for connecting the pull rod 8 to the pull block 7, Specifically, the inclined guide column 5 drives the slider 3 to move in the direction away from the product 4, and the guide sleeve 10 and the connecting piece 11 move with the slider 3. At this time, the connecting piece 11 and the slider 3 are away from the pull block 7, and the pull rod 8 partially extends out of the blind hole 22 until the blocking portion 23 of the pull rod 8 contacts the guide sleeve 10. The slider 3 continues to move, and the pull rod 8 pulls the pull block 7 in the direction of movement of the slider 3. The pull block 7 pulls the inner side of the product 4, causing the product 4 to deform, thereby causing the undercut on the inner side of the product 4 to detach from the mold.

[0039] In the above embodiment, if Figure 4 As shown, the blind hole 22 includes a first section and a second section, and a first elastic member 9 is provided on the first section of the blind hole 22. The pull rod 8 extends into the first section of the blind hole 22, and then extends into the second section of the blind hole 22 after passing through the first elastic member 9. The two ends of the first elastic member 9 are respectively abutted against the blocking portion 23 of the pull rod 8 and the bottom of the first section of the blind hole 22. Specifically, when the slider 3 moves in a direction away from the product 4, the pull rod 8 partially extends out of the blind hole 22, and at the same time, the pull rod 8 is partially pulled out of the second section of the blind hole 22. When the slider 3 is reset, the first elastic member 9 is abutted against the blocking portion 23 of the pull rod 8, so that the first elastic member 9 can provide buffering during the resetting process of the pull block 7 to prevent the pull block 7 from being damaged due to excessive force. At the same time, the initial position of the pull block 7 can be set by the length of the first elastic member 9 to ensure that the pull block 7 can accurately return to the initial position after the slider 3 is reset.

[0040] In this example, see Figure 6 A first guide block 18 is relatively arranged on the moving module 2, and the slider 3 is arranged between the first guide blocks 18. Mutually matching boss structures 19 are arranged on the opposite sides of the slider 3 and the first guide block 18. The boss structures 19 are spliced ​​with each other to form a guide rail, and the slider 3 is driven to slide on the first guide block 18 through the inclined guide column 5.

[0041] In this example, see Figure 5The moving module 2 is also provided with a limit block 17 and a second guide block 16 for limiting the stroke of the slider 3. The limit block 17 blocks the moving path of the slider 3. A guide groove matching the second guide block 16 is provided at the bottom of the slider 3. The slider 3 is clamped on the second guide block 16 through the guide groove. When the slider 3 moves on the moving module 2, the slider 3 moves to the maximum stroke of the second guide block 16, and the slider 3 is blocked by the limit block 17 to stop moving. The stroke of the slider 3 is limited by the second guide block 16, and the slider 3 is blocked by the limit block 17 to limit the pulling amplitude of the pull block 7 and prevent the pull block 7 from damaging the product 4.

[0042] In this embodiment, if Figure 6 As shown, a core-pulling structure 20 for demolding the outer side of the product 4 is provided on the slider 3. When the slider 3 moves away from the product 4, before the guide sleeve 10 contacts the blocking portion 23 of the pull rod 8, the core-pulling structure 20 is disengaged from the outer side of the product 4 to demold the undercut on the outer side of the product 4.

[0043] In some embodiments, Figure 5 As shown, a positioning clamp 12 for positioning the slider 3 is also provided on the moving module 2. The positioning structure includes a fixed shaft 15 and two clamping members. The fixed shaft 15 is connected to the moving module 2. The two clamping members can rotate around the fixed shaft 15. A positioning pin 13 is provided at the bottom of the slider 3. The clamping member has an arc-shaped clamping portion on the side close to the positioning pin 13. The clamping members are connected by a second elastic member 14. The second elastic member 14 sets the two clamping members in parallel. The clamping portions enclose a positioning circle with an opening. Specifically, when the slider 3 moves into place, the positioning pin 13 enters from the opening, the second elastic member 14 is subjected to force, and the two clamping members rotate around the fixed shaft 15 to allow the positioning pin 13 to enter the positioning circle. The second elastic member 14 is reset to close the opening, so as to position the slider 3 with the clamp 12 to prevent the slider 3 from moving after it is in place.

[0044] In this embodiment, the present invention further provides an injection mold, comprising:

[0045] Fixed module 1;

[0046] The movable module 2 is arranged opposite to the fixed module 1. The movable module 2 can move relative to the fixed module 1 to approach or move away from the fixed module 1. The fixed module 1 and the movable module 2 are both provided with a mold core for molding the product 4.

[0047] And the above-mentioned undercut demoulding mechanism.

[0048] In the above embodiment, a guide column 6 is provided on the fixed module 1, and a guide hole is provided on the movable module 2. The guide column 6 extends into or out of the guide hole to guide the movement of the movable module 2. During the movement of the movable module 2, the cooperation between the guide column 6 and the guide hole ensures that the injection mold is accurately closed and opened.

[0049] In summary, in the undercut demolding mechanism provided in the present application, when the movable module 2 is separated from the fixed module 1, the driving member drives the slider 3 to move in the movable module 2 in the direction away from the product 4. During the movement of the slider 3, the slider 3 is disengaged from the outer side of the product 4, and the outer side of the product 4 is undercut for demolding. The guide sleeve 10 follows the slider 3 to move until the guide sleeve 10 contacts the blocking portion 23 of the pull rod 8. The slider 3 continues to move to drive the pull block 7 to pull the inner side of the product 4 to be undercut for demolding. For the demolding of products with limited internal space in the mold, there is no need to set up a tilted top mechanism. The movement of the slider 3 drives the pull block 7 to pull the inner side of the product 4 to be undercut, so that the inner side of the product can be undercut for demolding, which reduces the difficulty of product demolding and ensures normal product demolding.

[0050] The above embodiments are merely illustrative of the principles and effects of the present application, and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. An undercut demoulding mechanism, characterized in that: include: A slider assembly is arranged between the fixed module and the movable module, the slider assembly includes a slider and a driving member, the slider can move on the movable module, one end of the driving member is connected to the fixed module, and the other end passes through the slider and is movably arranged on the movable module. When the movable module is separated from the fixed module, the driving member drives the slider to move on the movable module in a direction away from the product; A pulling assembly is arranged on the slider, and the pulling assembly includes a pulling block, a guide sleeve and a pulling rod. The pulling block is at least partially in contact with the inner side of the product. A blind hole is provided on the slider, one end of the pulling rod extends into the blind hole, and the other end passes through the guide sleeve and is connected to the pulling block. A blocking part is provided on the pulling rod. When the slider moves, the guide sleeve moves with the slider, and the guide sleeve contacts the blocking part of the pulling rod to drive the pulling block to pull the inner side of the product for demoulding.

2. The undercut demoulding mechanism according to claim 1, characterized in that: The driving member is an inclined guide column that is tilted. When the mold is opened, the movable module moves in the direction away from the fixed module. The inclined guide column drives the slider to move on the movable module in the direction away from the product. The inclined guide column is provided with a positioning block for positioning the inclined guide column at a position close to the fixed module.

3. The undercut demoulding mechanism according to claim 1, characterized in that: There are multiple groups of pulling assemblies, each group of the pulling assemblies also includes a connecting piece for fixing the guide sleeve, the connecting piece and the guide sleeve are both arranged on the slider, each group of the pulling assemblies has at least two pull rods and guide sleeves, one end of the pull rod passes through the guide sleeve and the connecting piece in sequence and is inserted into the pull block, and the pull block is also provided with a fastener connecting the pull rod to the pull block.

4. The undercut demoulding mechanism according to claim 3, characterized in that: The blind hole includes a first section and a second section. A first elastic member is provided on the first section of the blind hole. The pull rod extends into the first section of the blind hole and then extends into the second section of the blind hole after passing through the first elastic member. Both ends of the first elastic member are respectively in contact with the blocking portion of the pull rod and the bottom of the first section of the blind hole.

5. The undercut demoulding mechanism according to claim 1, characterized in that: The moving modules are provided with first guide blocks opposite to each other, the slider is provided between the first guide blocks, the slider and the first guide blocks are provided with boss structures matching each other on opposite sides, and the boss structures are spliced ​​with each other to form a guide rail.

6. The undercut demoulding mechanism according to claim 1, characterized in that: The movable module is also provided with a limit block and a second guide block for limiting the stroke of the slider, the limit block blocks the moving path of the slider, the bottom of the slider is provided with a guide groove matching the second guide block, the slider is clamped on the second guide block through the guide groove, and when the slider moves on the movable module to the maximum stroke of the second guide block, the slider is blocked by the limit block and stops moving.

7. The undercut demoulding mechanism according to claim 1, characterized in that: The slider is provided with a core-pulling structure for demoulding the outer side of the product. When the slider moves away from the product, the core-pulling structure is pulled out from the outer side of the product to demould the outer side of the product.

8. The undercut demoulding mechanism according to claim 1, characterized in that: The movable module is also provided with a positioning clamp for positioning the slider, the positioning structure includes a fixed shaft and two clamping members, the fixed shaft is connected to the movable module, the two clamping members can rotate around the fixed shaft, a positioning pin is provided at the bottom of the slider, the clamping member has an arc-shaped clamping portion on the side close to the positioning pin, the clamping members are connected by a second elastic member, the second elastic member sets the two clamping members in parallel, and the clamping portions enclose a positioning circle with an opening.

9. An injection mold, characterized in that: include: Fixed module; A movable module is arranged opposite to the fixed module, and the movable module can move relative to the fixed module to approach or move away from the fixed module, and both the fixed module and the movable module are provided with a mold core for molding products; And an undercut demoulding mechanism as claimed in any one of claims 1 to 8.

10. The injection mold according to claim 9, characterized in that: The fixed module is provided with a guide column, and the movable module is provided with a guide hole. The guide column extends into or withdraws from the guide hole to guide the movement of the movable module.

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