A barb demolding mechanism

Abstract

The application provides a barb demolding mechanism, which comprises an upper mold block, a lower mold block, a mold foot and a bottom plate, a ejector plate is arranged between the lower mold block and the bottom plate, an ejection assembly is arranged on the ejector plate, a first sliding block and a second sliding block are arranged on the lower mold block, a first inclined guide column for driving the first sliding block to move is connected to the upper mold block, a demolding driving cylinder for driving the second sliding block to move is connected to the lower mold block; a third sliding block is further arranged on the lower mold block, a second inclined guide column for driving the third sliding block to move is arranged on the upper mold block; an inner core-pulling block unit and a driving assembly are arranged on the lower mold block, the driving assembly is used for driving the inner core-pulling block unit to move horizontally to realize core-pulling demolding of the inner walls of the two sides of the L-shaped barb; a locking assembly for locking and unlocking the horizontal movement of the inner core-pulling block unit is further arranged on the lower mold block. The barb demolding mechanism disclosed by the application has reasonable space layout and can realize easy demolding of a barb with a large flange amount.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, specifically to a hook-type demolding mechanism. Background Technology

[0002] Injection molds are tools used to produce plastic products, giving them a complete structure and precise dimensions. Injection molding is a processing method used for the mass production of certain complex-shaped parts. Specifically, it involves injecting molten plastic into a mold cavity under high pressure using an injection molding machine, where it is then cooled and solidified to obtain the molded product.

[0003] Currently, in injection mold design, products with multiple locking points and undercut structures are frequently encountered. The common approach is to use angled ejectors or rocker arms, or to utilize material properties combined with the product structure to allow for a certain amount of elastic deformation space to force demolding. However, these solutions are not suitable for some products. For example... Figure 1 The image shows a prior art automotive dashboard with a barb with a large flange, and this barb has an overall L-shaped structure, referred to as an L-shaped barb. One end of the L-shaped barb 1 has an opening 1.1. This structure presents significant difficulties during product demolding, as traditional demolding mechanisms are challenging in terms of both operating space and installation structure. Therefore, a novel demolding mechanism needs to be developed to address this issue of the large flange in the prior art barb structure. Summary of the Invention

[0004] The problem solved by this invention is to overcome the defects in the prior art by providing a barbed demolding mechanism with a reasonable spatial layout, which can easily demold barbed hooks with a large amount of flange.

[0005] To address the aforementioned problems, this invention provides a barb demolding mechanism, comprising an upper module, a lower module, mold feet, and a base plate. The lower end of the lower module is connected to the base plate via the mold feet. A mold cavity for molding an automotive dashboard is formed between the upper and lower modules. A vertically movable ejector plate is disposed between the lower end face of the lower module and the upper end face of the base plate. An ejector assembly for ejecting the automotive dashboard is disposed on the ejector plate. The lower module is provided with a first slider and a second slider, respectively corresponding to the outer walls of the two sides of the L-shaped barb of the automotive dashboard. A mechanism for driving the first slider to move horizontally is connected to the upper module. The first inclined guide post is connected to the lower module, which is a demolding drive cylinder for driving the second slider to move horizontally. The lower module is also provided with a third slider corresponding to one end opening of the L-shaped barb of the car instrument panel. The upper module is provided with a second inclined guide post for driving the third slider to move horizontally to demold the opening. The lower module is provided with an inner core-pulling block unit and a drive assembly. The drive assembly is used to drive the inner core-pulling unit to move horizontally to demold the inner walls of the two sides of the L-shaped barb. The lower module is also provided with a locking assembly for locking and unlocking the horizontal movement of the inner core-pulling unit.

[0006] The injection mold of the present invention has the following advantages compared with the prior art:

[0007] In the barbed hook demolding mechanism structure of the present invention, different demolding mechanisms are respectively set on the inner and outer sides of the barbed hook structure with a large flange amount through spatial layout optimization. Specifically, the outer wall of the barbed hook structure is demolded quickly by the translation of the first slider, the second slider and the third slider, and the driving structure of each slider is simple and easy to implement. On the other hand, the inner wall of the barbed hook structure is demolded by the inner core pulling unit, and the core pulling movement of the inner core pulling unit is controlled by a corresponding locking component, which effectively avoids the risk of the inner core pulling unit automatically opening when the mold is closed, resulting in product scrap.

[0008] Furthermore, the ejector assembly includes two inclined ejector blocks for support at both ends of the vehicle dashboard. Two sets of ejector pin units are connected to the ejector pin plate for connecting the two inclined ejector blocks respectively. Each ejector pin unit includes an ejector pin, the upper end of which is connected to the corresponding inclined ejector block. A guide channel extending along the inclined direction of the ejector pin is provided on the ejector pin plate. The lower end of the ejector pin slidably engages within the guide channel. A drive unit is provided between the lower module and the base plate to drive the lower end of the ejector pin to slide along the guide channel. In the above structure, the ejector assembly uses a guide rod for guiding and driving, ensuring stable and reliable ejection of the product.

[0009] As an improvement, the driving unit includes a guide rod arranged parallel to the ejector pin. The upper and lower ends of the guide rod are connected to the lower module and the base plate, respectively. A guide slider capable of sliding along its length is provided within the guide channel. A first mounting groove and a second mounting groove are respectively provided at both ends of the guide slider. A sliding sleeve is slidably fitted onto the outer wall of the guide rod, and the sliding sleeve is rotatable within the first mounting groove along the length of the guide channel. The lower end of the ejector pin is rotatably connected to the second mounting groove along the length of the guide channel. In this improved structure, the guide channel and guide slider structure enable the ejector pin to move with the ejector plate during the ejection process, ensuring flexible product ejection.

[0010] In a further improvement, the inner core-pulling unit includes a first core-pulling block and a second core-pulling block corresponding to the two sides of the L-shaped barb, respectively, with the first core-pulling block located between the two inclined ejector blocks; the driving assembly includes a first core-pulling driving cylinder and a second core-pulling driving cylinder, with the driving end of the first core-pulling driving cylinder connected to the first core-pulling block, and the driving end of the second core-pulling driving cylinder connected to the second core-pulling block. In the above improved structure, demolding of the inner sidewall of the L-shaped barb is achieved through two core-pulling blocks at different positions, and both core-pulling operations are directly driven by the core-pulling driving cylinders, resulting in a simple structure and convenient demolding.

[0011] In a further improvement, the locking assembly includes a locking block that moves vertically upwards and downwards, and a locking drive cylinder for driving the locking block to move up and down. The lower module has a mounting hole, and the locking block slides within the mounting hole. The lower module also has a mold core. The mold core, the first slider, the second slider, the inclined ejector block, the first core-pulling block, and the second core-pulling block together form the lower forming surface of the automotive dashboard. The lower module also has a latching unit for limiting the movement of the locking block. In the improved structure described above, the mold core, first slider, second slider, inclined ejector block, first core-pulling block, second core-pulling block, and locking block are combined to form the lower molding surface of the car dashboard. When the mold is closed, each motion module forms a complete molding surface. When the mold is opened, each motion module moves accordingly to achieve product demolding and unlocking of the core-pulling blocks. More importantly, the locking block in this structure plays a role in space avoidance. In the initial stage, the locking block is used to limit the movement of the two core-pulling blocks. When core-pulling demolding is required, the locking block moves downward to leave clearance space so that the two core-pulling blocks can move smoothly along the set direction to achieve core-pulling demolding of the hook.

[0012] In a further improvement, the locking unit includes a lock cylinder and a drive block. The locking block has a locking hole on the side furthest from the first core-pulling block. One end of the lock cylinder is connected to the drive block, and the other end slides within the locking hole. The upper module is also connected to a third inclined guide post for driving the drive block horizontally. In this structure, the lock cylinder vertically limits the locking block, preventing damage to the lower molding surface and ensuring product quality during mold closing and injection molding due to a malfunction of the locking drive cylinder. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a car dashboard structure based on existing technology.

[0014] Figure 2 This is a partial structural diagram of the barbed demolding mechanism of the present invention; (mold closed state)

[0015] Figure 3 This is another structural diagram of the barbed demolding mechanism of the present invention; (first step demolding)

[0016] Figure 4 This is another structural diagram of the barbed demolding mechanism of the present invention; (Second demolding step)

[0017] Figure 5 This is another structural diagram of the barbed demolding mechanism of the present invention; (third step demolding)

[0018] Figure 6 This is a schematic diagram of the ejection assembly in this invention;

[0019] Figure 7 for Figure 6 Enlarged structural diagram at point A in the diagram;

[0020] Figure 8 This is a structural schematic diagram of another state of the ejection component in this invention;

[0021] Figure 9 for Figure 1 Partial structural diagram of the undercut demolding mechanism;

[0022] Figure 10 for Figure 9 A structural diagram showing the removal of the lower module from the middle structure.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. L-shaped barb; 1.1. Opening; 2. Lower module; 3. Mold foot; 4. Base plate; 5. Ejector plate; 6. First slider; 7. Second slider; 8. First inclined guide post; 9. Demolding drive cylinder; 10. Third slider; 11. Second inclined guide post; 12. Inclined ejector block; 13. Ejector pin; 14. Guide channel; 15. Guide rod; 16. Guide slider; 17. First mounting slot; 18. Second mounting slot; 19. Sliding sleeve; 20. First core-pulling block; 21. Second core-pulling block; 22. First core-pulling drive cylinder; 23. Second core-pulling drive cylinder; 24. Locking block; 25. Locking drive cylinder; 26. Mounting hole; 27. Locking cylinder; 28. Drive block; 29. ​​Locking hole; 30. Third inclined guide post; 31. Mold core. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] In the description of this invention, it should be noted that the terms "upper end," "lower end," "inner wall," and "outer wall," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, in the description of this invention, the terms "first," "second," and "third" are used only for convenience of description and distinction, and do not have any specific meaning.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it 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 invention based on the specific circumstances.

[0028] like Figures 1-10 As shown, the present invention provides a hook demolding mechanism, including an upper module (not shown in the figure), a lower module 2, four mold feet 3, and a base plate 4. The lower end of the lower module 2 is connected to the base plate 4 through the four mold feet 3. A mold cavity for molding an automotive dashboard is formed between the upper module and the lower module 2. A vertically movable ejector plate 5 is provided between the lower end face of the lower module 2 and the upper end face of the base plate 4. An ejector assembly for ejecting the automotive dashboard is provided on the ejector plate 5. Specifically, four ejector plate 5 drive cylinders are provided between the lower module 2 and the base plate 4. After the various hook mechanisms of the automotive dashboard are demolded, the four ejector plate 5 drive cylinders drive the ejector plate 5 to move upward as a whole, and the automotive dashboard is lifted up under the action of the ejector assembly.

[0029] The automotive dashboard injection mold involved in this application has a one-mold-two-out structure, that is, two products are molded at one time. In this embodiment, one side is selected for detailed description.

[0030] The lower module 2 is equipped with a first slider 6 and a second slider 7, respectively corresponding to the outer walls of the two sides of the L-shaped barb 1 of the car dashboard. The upper module is connected to a first inclined guide post 8 for driving the first slider 6 to move horizontally, and the lower module 2 is connected to a demolding drive cylinder 9 for driving the second slider 7 to move horizontally. Specifically, a first inclined guide hole is opened on the first slider 6, the upper end of the first inclined guide post 8 is connected to the upper module, and the lower end slides in the first inclined guide hole. During the mold opening process of the upper and lower modules 2, under the guidance of the first inclined guide post 8, the first slider 6 moves towards... The second slider 7 moves away from the car dashboard, thus demolding the outer wall of one side of the L-shaped hook 1 on the car dashboard. Furthermore, due to spatial constraints, the driving mechanism of the second slider 7 differs from that of the first slider 6. Here, a horizontally mounted demolding drive cylinder 9 is installed on the lower module 2, and its drive cylinder is connected to the second slider 7. During mold opening, the operation of the demolding drive cylinder 9 drives the second slider 7 to move away from the car dashboard, thus demolding the outer wall of the other side of the L-shaped hook 1 on the car dashboard. Further, to control the stroke of the second slider 7, a corresponding limiting post is also provided on the lower module 2. One end of the limiting post is connected to the housing of the demolding drive cylinder 9, and the other end extends along the piston rod movement direction of the demolding drive cylinder 9. During mold opening, the second slider 7 moves away from the car dashboard until it abuts against the limiting post and stops moving.

[0031] On another note, in the above structure, a third slider 10 is also provided on the lower module 2, which corresponds to the opening 1.1 of the L-shaped barb 1 of the car instrument panel. A second inclined guide post 11 is provided on the upper module to drive the third slider 10 to move horizontally so as to demold the opening 1.1. The inclined guide post driving structure here is the same as the first slider 6 driving structure, and will not be described in detail.

[0032] In addition, the most critical part of this embodiment is to demold the inner walls of the two sides of the L-shaped barb 1 on the car dashboard. Specifically, an inner core-pulling block unit and a drive assembly are provided on the lower module 2. The drive assembly is used to drive the inner core-pulling unit to move horizontally to achieve core-pulling demolding of the inner walls of the two sides of the L-shaped barb 1. The lower module 2 is also provided with a locking assembly for locking and unlocking the horizontal movement of the inner core-pulling unit.

[0033] In the above structure, such as Figure 6 , 7As shown in Figure 8, the ejector assembly includes two inclined ejector blocks 12 for support at both ends of the vehicle dashboard. The ejector plate 5 is connected to two sets of ejector pin 13 units for connecting the two inclined ejector blocks 12 respectively. The ejector pin 13 unit includes an ejector pin 13, the upper end of which is connected to the corresponding inclined ejector block 12. The ejector plate 5 is provided with a guide channel 14 extending along the inclined direction of the ejector pin 13. The lower end of the ejector pin 13 is slidably fitted in the guide channel 14. A drive unit for driving the lower end of the ejector pin 13 to slide along the guide channel 14 is provided between the lower module 2 and the base plate 4.

[0034] More specifically, in this embodiment, the driving unit includes a guide rod 15 arranged parallel to the ejector pin 13. The upper and lower ends of the guide rod 15 are connected to the lower module 2 and the base plate 4, respectively. A guide slider 16 that can slide along its length direction is provided in the guide channel 14. In order to ensure the stable sliding of the guide slider 16, limit plates are provided on both side walls in the width direction of the guide channel 14. Limiting grooves extending along the sliding direction of the guide slider 16 are provided on the inner walls of the two limit plates. In addition, a first mounting groove 17 and a second mounting groove 18 are provided at both ends of the guide slider 16, respectively. A sliding sleeve 19 is slidably fitted on the outer wall of the guide rod 15, and the sliding sleeve 19 can rotate in the first mounting groove 17 along the length direction of the guide channel 14. The lower end of the ejector pin 13 can be rotatably connected in the second mounting groove 18 along the length direction of the guide channel 14. In this structure, the first mounting groove 17 and the second mounting groove 18 are U-shaped grooves that are respectively set at both ends of the guide slider 16 and are open to the outside. The outer wall of the sliding sleeve 19 is connected to the corresponding positions of the two side walls of the first mounting groove 17, so as to realize the rotational connection between the sliding sleeve 19 and the guide slider 16. Similarly, a fixing sleeve is connected to the lower end of the ejector pin 13, and the outer wall of the fixing sleeve is also rotatably connected to the two inner walls of the second mounting groove 18 through the second pin.

[0035] The inner core-pulling unit includes a first core-pulling block 20 and a second core-pulling block 21 corresponding to the two sides of the L-shaped barb 1, and the first core-pulling block 20 is located between the two inclined top blocks 12; the driving assembly includes a first core-pulling driving cylinder 22 and a second core-pulling driving cylinder 23, the driving end of the first core-pulling driving cylinder 22 is connected to the first core-pulling block 20, and the driving end of the second core-pulling driving cylinder 23 is connected to the second core-pulling block 21.

[0036] like Figure 9 , 10As shown, the locking assembly includes a locking block 24 that moves vertically upwards and downwards, and a locking drive cylinder 25 for driving the locking block 24 to move upwards and downwards. Specifically, a mounting hole 26 is provided on the lower module 2, and the locking block 24 is slidably fitted in the mounting hole 26. The two vertically distributed outer walls of the locking block 24 are respectively in contact with the inner walls of the first core-pulling block 20 and the second core-pulling block 21. The lower module 2 is also provided with a latching unit for limiting the upward and downward movement of the locking block 24. In this structure, a mold core 31 is also provided on the lower module 2. The mold core 31, the first slider 6, the second slider 7, the inclined ejector block 12, the first core-pulling block 20, and the second core-pulling block 21 are combined to form the lower forming surface of the car dashboard.

[0037] The locking unit involved in the above structure includes a lock cylinder 27 and a drive block 28. The locking block 24 is provided with a lock hole 29 on the side away from the first core-pulling block 20. One end of the lock cylinder 27 is connected to the drive block 28, and the other end is slidably fitted in the lock hole 29. The upper module is also connected to a third inclined guide rod for driving the drive block 28 to move horizontally. The structure in which the third inclined guide rod drives the drive block 28 to move is the same as the structure in which the first inclined guide rod drives the first slider 6 in the horizontal direction, and will not be repeated here.

[0038] Reference Appendix Figures 2-5 The demolding process of the barbed demolding mechanism in this invention includes the following three main steps:

[0039] Step 1: The upper and lower modules 2 are opened. Under the driving action of the first inclined guide post 8, the second inclined guide post 11, and the third inclined guide post 30, the first slider 6 and the third slider 10 move horizontally outward to demold one side of the outer wall of the car dashboard's hook structure. At the same time, the driving block 28 moves outward to drive the lock cylinder 27 to unlock the locking block 24. The demolding driving cylinder 9 drives the second slider 7 to move horizontally outward to demold the other side of the car dashboard's hook structure. Meanwhile, the locking driving cylinder 25 drives the locking block 24 to move downward to release the restriction on the first core-pulling block 20 and the second core-pulling block 21.

[0040] Step 2: The first core-pulling drive cylinder 22 and the second core-pulling drive cylinder 23 respectively drive the first core-pulling block 20 and the second core-pulling block 21 to retract and run inward, so as to realize the core-pulling and demolding of the corresponding inner wall position of the hook structure of the car dashboard.

[0041] Step 3: Under the action of the drive cylinder of the ejector plate 5, the ejector plate 5 moves upward, and under the action of the inclined guide rod 15, the guide slider 16 moves in the guide channel 14, thereby driving the ejector 13 to move upward until it is completely ejected from the car dashboard.

[0042] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A hook-shaped demolding mechanism, comprising an upper module, a lower module (2), a mold foot (3), and a base plate (4), wherein the lower end of the lower module (2) is connected to the base plate (4) via the mold foot (3), a mold cavity for molding an automotive dashboard is formed between the upper module and the lower module (2), and a vertically movable ejector plate (5) is provided between the lower end face of the lower module (2) and the upper end face of the base plate (4), wherein an ejector assembly for ejecting the automotive dashboard is provided on the ejector plate (5), characterized in that: The lower module (2) is provided with a first slider (6) and a second slider (7) respectively corresponding to the outer walls of the two sides of the L-shaped barb (1) of the car instrument panel. The upper module is connected with a first inclined guide post (8) for driving the first slider (6) to move horizontally. The lower module (2) is connected with a demolding drive cylinder (9) for driving the second slider (7) to move horizontally. The lower module (2) is also provided with a third slider (10) corresponding to one end opening (1.1) of the L-shaped barb (1) of the car instrument panel. The upper module is provided with a mechanism for driving the third slider (10) to move horizontally. The second inclined guide post (11) is used to achieve demolding of the opening (1.1); the lower module (2) is provided with an inner core-pulling block unit and a driving assembly. The driving assembly is used to drive the inner core-pulling block unit to move horizontally to achieve core-pulling demolding of the inner walls on both sides of the L-shaped hook (1); the lower module (2) is also provided with a locking assembly for locking and unlocking the horizontal movement of the inner core-pulling block unit; the ejection assembly includes two inclined ejector blocks (12) for supporting at both ends of the car dashboard, and two sets of ejector pin (13) units for connecting the two inclined ejector blocks (12) respectively are connected to the ejector plate (5); The inner core-pulling block unit includes a first core-pulling block (20) and a second core-pulling block (21) corresponding to the two sides of the L-shaped barb (1), and the first core-pulling block (20) is located between the two inclined top blocks (12); the driving assembly includes a first core-pulling driving cylinder (22) and a second core-pulling driving cylinder (23), the driving end of the first core-pulling driving cylinder (22) is connected to the first core-pulling block (20), and the driving end of the second core-pulling driving cylinder (23) is connected to the second core-pulling block (21); the locking assembly includes a locking block (24) that moves vertically and a locking driving cylinder (25) for driving the locking block (24) to move up and down, and a mounting hole (26) is provided on the lower module (2), and the locking block (24) slides in the mounting hole (26). The lower module (2) is also provided with a mold core (31), the mold core (31), the first slider (6), the second slider (7), the inclined top block (12), the first core-pulling block (20) and the second core-pulling block (21) are combined to form the lower forming surface of the car dashboard; the lower module (2) is also provided with a locking unit for limiting the lifting and lowering of the locking block (24); the locking unit includes a lock core (27) and a drive block (28), the locking block (24) is provided with a lock hole (29) on the side away from the first core-pulling block (20), one end of the lock core (27) is connected to the drive block (28), and the other end is slidably fitted in the lock hole (29); the upper module is also connected with a third inclined guide post (30) for driving the drive block (28) to move horizontally.

2. The barbed demolding mechanism according to claim 1, characterized in that: The ejector pin (13) unit includes an ejector pin (13), the upper end of which is connected to a corresponding inclined ejector block (12). The ejector pin plate (5) has a guide channel (14) extending along the inclined direction of the ejector pin (13). The lower end of the ejector pin (13) is slidably fitted in the guide channel (14). A drive unit for driving the lower end of the ejector pin (13) to slide along the guide channel (14) is provided between the lower module (2) and the base plate (4).

3. The barbed demolding mechanism according to claim 2, characterized in that: The driving unit includes a guide rod (15) arranged parallel to the ejector pin (13). The upper and lower ends of the guide rod (15) are connected to the lower module (2) and the base plate (4) respectively. A guide slider (16) that can slide along its length is provided in the guide channel (14). The two ends of the guide slider (16) are respectively provided with a first mounting groove (17) and a second mounting groove (18). A sliding sleeve (19) is slidably fitted on the outer wall of the guide rod (15), and the sliding sleeve (19) can rotate in the first mounting groove (17) along the length of the guide channel (14). The lower end of the ejector pin (13) is rotatably connected in the second mounting groove (18) along the length of the guide channel (14).

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