Demolding mechanism

Abstract

The utility model relates to the technical field of molds, in particular to a demolding mechanism which comprises a first ejector rod and a second ejector rod, a first matching part for constructing an outer inverted buckle is arranged on the side wall of the first ejector rod, and the first ejector rod moves in the mold opening direction and the first direction perpendicular to the mold opening direction at the same time under the action of a mold driving part; the second ejector rod is arranged in the first direction perpendicular to the mold opening direction, the second ejector rod and a first plane perpendicular to the mold opening direction are arranged in an inclined mode, and one end of the second ejector rod extends into the first ejector rod and is provided with a second matching part for constructing an inner inverted buckle. And a limiting structure is arranged between the driving rod and the second ejector rod, and the second ejector rod moves in the mold opening direction under the action of the mold driving piece and the driving rod and moves in the second direction perpendicular to the mold opening direction under the action of the limiting structure and the first ejector rod, so that the second matching part is separated from the inner inverted buckle. According to the demolding mechanism, the shell with the front and back inverted buckles on the same face can be separated from the mold at a time, and the production process is simplified.

Description

Technical Field

[0001] This application relates to the field of mold technology, and in particular to a demolding mechanism. Background Technology

[0002] A mold generally consists of a fixed mold and a moving mold. The product is formed by the combination of the fixed mold side cavities on the fixed mold and the moving mold side cavities. Molds can form complex product structures, therefore injection molded products are widely used in industrial product manufacturing. In injection molding, it is common to encounter products with "undercut" structures such as internal clipping, external clipping, upper convexity, lower concaveness, side concavity, and side convexity, which are inconsistent with the mold opening direction and affect the complete mold opening. The solution is usually to create a mold opening scheme, commonly using structures such as "angled ejector pins" and "sliding blocks".

[0003] However, for some special product designs, such as housings containing at least three continuous surfaces, especially housings of household appliances, in order to ensure that the entire surface of the housing is flat and aesthetically pleasing, and at the same time to ensure that the production and installation process of assembling the housing as a whole is simple and easy to operate, and that the connection between the assembled housing and other components is firm, it is necessary to have internal and external undercuts in different directions on at least one surface. The existing single-mold core-pulling solution cannot complete the one-time complete demolding of the product. For example, the existing patent application publication number CN118219509A discloses a core-pulling mechanism and its mold, in which one end of the first push rod of the core-pulling mechanism is connected to the driving component of the mold. The first ejector pin has one end abutting against the product, and is inclined to the mold opening direction. The second ejector pin intersects with the first ejector pin and is slidably fitted. The first end of the second ejector pin has a barb forming a groove. The guide plate is parallel to the depth direction of the groove. In the mold opening direction, when the mold opening length is not greater than the depth of the groove, the second end of the second ejector pin slides against the guide plate. A limiting structure is set between the first and second ejector pins. In the mold opening direction, when the mold opening length is greater than the depth of the groove, the limiting structure allows the first ejector pin to drive the second ejector pin to move in a direction perpendicular to the mold opening direction, achieving complete demolding of the bent part and the groove on the bent part.

[0004] While the aforementioned core-pulling structure can demold products with multiple "undercut" forms within a single structure, after demolding, a robotic arm is needed to move the product in a direction perpendicular to the mold opening direction. The product can only be removed after moving a certain distance. For shells with at least three continuous surfaces, when the robotic arm moves the product in a direction perpendicular to the mold opening direction after demolding, one of the surfaces will block the movement, preventing the shell from being demolded and removed from the mold in one go. This necessitates either changing the product structure design or adding or modifying the mold, making the mold structure more complex and significantly increasing product manufacturing costs. Utility Model Content

[0005] To effectively solve the above problems, this application provides a demolding mechanism.

[0006] This application provides a demolding mechanism, which adopts the following technical solution:

[0007] A demolding mechanism includes a first ejector rod and a second ejector rod. The side wall of the first ejector rod is provided with a first mating part with an external undercut. One end of the first ejector rod is connected to a mold drive component so that the first ejector rod can move simultaneously in the mold opening direction and a first direction perpendicular to the mold opening direction under the action of the mold drive component. The second ejector rod is arranged along the first direction perpendicular to the mold opening direction and is inclined to a first plane perpendicular to the mold opening direction. One end of the second ejector rod is connected to a drive rod, and the other end extends into the first ejector rod and is provided with a second mating part with an internal undercut.

[0008] The other end of the drive rod is connected to the mold drive component, and a limiting structure is provided between the drive rod and the second ejector rod. The second ejector rod moves in the mold opening direction under the action of the mold drive component and the drive rod, and moves in a second direction perpendicular to the mold opening direction under the action of the limiting structure and the first ejector rod, so that the second mating part disengages from the inner undercut.

[0009] By adopting the above technical solution, after the moving mold and the fixed mold open, the mold drive component drives the first ejector pin to move. This causes the first ejector pin to move in the mold opening direction and simultaneously in a first direction perpendicular to the mold opening direction, causing the sidewall of the first ejector pin to detach from the shell and the first mating part to disengage from the outer undercut. At the same time, the moving mold drive component drives the drive rod to move along the mold opening direction and causes the second ejector pin to move along the mold opening direction. Since the second ejector pin is located inside the first ejector pin, the first ejector pin compresses the second ejector pin during its movement. With the assistance of the limiting structure, the first ejector pin moves in a second direction perpendicular to the mold opening direction, causing the second mating part to disengage from the inner undercut, thus achieving demolding of the shell. At this point, the shell can be removed by using a robotic arm to move it along the mold opening direction and then along either the first or second direction perpendicular to the mold opening direction. Demolding is therefore quite convenient.

[0010] The demolding mechanism of this application can remove shells with both positive and negative undercuts on the same side from the mold in one go, simplifying the production process. The shells produced are firmly connected and aesthetically pleasing. Furthermore, the demolding mechanism has a simple structure, is easy to manufacture, and reduces the production cost of the product. In addition, the drive rod moves along the mold opening direction under the drive of the mold drive component, and the second ejector rod moves with the drive rod. The drive rod has a long stroke, which can disengage the second ejector rod from the inner undercut with a large depth. In the prior art, one end of the second ejector rod slides against the guide plate set in the moving mold, and the stroke of the second ejector rod depends on the height of the moving mold itself. When producing inner undercuts with a large depth, it is necessary to replace the moving mold with one of suitable height, which is costly. This application does not require changing the height of the moving mold, and its moving mold has strong adaptability. Moreover, the overall volume of the mold is small, effectively reducing the space occupied by the mold.

[0011] Optionally, the distance between the first push rod and the drive rod is greater than the length of the outer undercut.

[0012] By adopting the above technical solution, it can be ensured that the first push rod detaches from the housing and the outer buckle during the movement.

[0013] Optionally, the side wall of the first ejector rod near the drive rod is inclined to the mold opening direction and abuts against the moving mold core of the mold. The thickness of the first ejector rod gradually increases along the moving direction of the drive rod, and a sliding member inclined along the mold opening direction is provided between the first ejector rod and the moving mold core.

[0014] By adopting the above technical solution, the side wall of the first ejector rod near the drive rod is inclined to the mold opening direction and abuts against the moving mold core. The thickness of the first ejector rod gradually increases along the moving direction of the drive rod. After cooperating with the sliding block groove, it helps the first ejector rod to move in the mold opening direction and in a first direction perpendicular to the mold opening direction under the driving action of the mold drive component. Furthermore, the first ejector rod is in close contact with the moving mold core, which can improve the stability of the movement of the first ejector rod.

[0015] Optionally, the sliding component includes a sliding block disposed on the first ejector rod, the sliding block being inclined along the mold opening direction, and the mold core being provided with a sliding groove that slides with the sliding block; or, the sliding component includes a sliding block disposed on the mold core, the sliding block being inclined along the mold opening direction, and the first ejector rod being provided with a sliding groove inclined along the mold opening direction.

[0016] Optionally, the distance between the sliding block and the driving block gradually decreases along the moving direction of the driving rod.

[0017] Optionally, a relief groove is provided on the side wall of the first ejector rod near the drive rod. The relief groove extends along the mold opening direction, and the drive rod is located in the relief groove when the first ejector rod moves.

[0018] Optionally, the depth of the clearance groove gradually increases along the moving direction of the drive rod.

[0019] Optionally, the limiting structure includes a limiting block disposed on the second push rod, and a limiting groove for sliding the limiting block is disposed on the drive rod along a second direction perpendicular to the mold opening direction, and the length of the limiting groove along the second direction perpendicular to the mold opening direction is greater than the length of the inner undercut.

[0020] Alternatively, the limiting component includes a limiting block disposed on the drive rod, the limiting block extending along a second direction perpendicular to the mold opening direction, and a sliding groove provided on the second push rod for the limiting block to slide, the length of the limiting block along the second direction perpendicular to the mold opening direction being greater than the length of the inner undercut.

[0021] Optionally, it also includes an ejector plate, which is connected to the mold drive component, and the first ejector rod and the drive rod are both fixedly mounted on the ejector plate.

[0022] Optionally, the distance the ejector plate moves along the mold opening direction is greater than the depth of the inner undercut. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the shell structure shown in an embodiment of this application.

[0024] Figure 2 This is a schematic diagram of the demolding mechanism shown in the embodiments of this application.

[0025] Figure 3 This is a schematic diagram of the demolding mechanism and the housing shown in the embodiments of this application.

[0026] Figure 4 This is another structural schematic diagram of the demolding structure and the shell shown in the embodiments of this application.

[0027] Figure 5 This is a top view of the moving model shown in the embodiment of this application.

[0028] Figure 6 This is a schematic diagram of the mold structure shown in the embodiment of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Shell; 11. First surface; 12. Second surface; 13. Third surface; 14. Inner undercut; 15. Outer undercut; 21. Fixed mold; 22. Moving mold; 221. Moving mold core; 23. Slider; 3. Demolding mechanism; 31. First ejector pin; 311. First mating part; 312. Sliding block; 313. Relief groove; 32. Second ejector pin; 321. Second mating part; 33. Drive rod; 34. Limiting structure; 341. Limiting block; 342. Limiting groove; 35. Fixing rod; 36. Ejector plate. Detailed Implementation

[0030] The present application will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments are merely specific illustrations of the present application, and their purpose is to enable those skilled in the art to better understand the technical solutions of the present application, and should not be regarded as limitations on the present application.

[0031] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0032] This application discloses a housing, such as... Figure 1 As shown, it includes at least three continuous surfaces, and at least one surface is provided with inner undercuts 14 and outer undercuts 15 in different directions. In this embodiment, the housing 1 can be the main body of the cooking device, which includes a first surface 11, a second surface 12 and a third surface 13. The first surface 11, the second surface 12 and the third surface 13 are connected in sequence to form a U-shape. The inner sidewall of the first surface 11 is provided with an inner undercut 14, and the outer sidewall of the first surface 11 is provided with at least one outwardly extending outer undercut 15.

[0033] This application also discloses a demolding mechanism, including a first ejector rod 31 and a second ejector rod 32. One side wall of the first ejector rod 31 has a first mating part 311 that forms an external undercut 15. One end of the first ejector rod 31 is connected to a mold drive component, causing the first ejector rod 31 to move simultaneously in the mold opening direction and a first direction perpendicular to the mold opening direction under the action of the mold drive component, so that the first mating part 311 disengages from the external undercut 15. The second ejector rod 32 is arranged along the first direction perpendicular to the mold opening direction and is inclined to the first plane perpendicular to the mold opening direction. The second ejector rod 32 is connected to a drive rod 33 at one end and extends into the first ejector rod 31 at the other end, and has a second mating part 321 with an inner undercut 14. The other end of the drive rod 33 is connected to the mold drive component, and a limiting structure 34 is provided between the drive rod 33 and the second ejector rod 32. The second ejector rod 32 moves in the mold opening direction under the driving action of the mold drive component and the drive rod 33, and moves in a second direction perpendicular to the mold opening direction under the action of the limiting structure 34 and the first ejector rod 31, so that the second mating part 321 disengages from the inner undercut 14.

[0034] It should be noted that the mold opening direction is the direction in which the moving mold 22 moves relative to the fixed mold 21. When the mold opening direction is defined as the x-axis, the first direction perpendicular to the mold opening direction is the y-axis, the second direction perpendicular to the mold opening direction is the z-axis, and the first plane perpendicular to the mold opening direction is the plane containing the y-axis, i.e., the vertical plane. In other embodiments, the first direction perpendicular to the mold opening direction can also be the z-axis, and the second direction perpendicular to the mold opening direction can be the y-axis.

[0035] Its drive rod 33 is located at the end of the first push rod 31 away from the first surface 11 of the housing. The distance between the first push rod 31 and the drive rod 33 is greater than the length of the outer buckle 15, so as to ensure that the first push rod 31 is disengaged from the housing 1 and the outer buckle 15 during the movement.

[0036] After the moving mold 22 and the fixed mold 21 are opened, the demolding mechanism 3 installed inside the moving mold 22 will move relative to other parts of the moving mold 22 under the driving action of the mold driving component, and remove the shell 1 from the moving mold 22 to achieve complete demolding of the shell 1.

[0037] Specifically, the mold drive component moves the first ejector pin 31, causing it to move in the mold opening direction and simultaneously in a first direction perpendicular to the mold opening direction, i.e., the first ejector pin 31 moves to the left and forward, causing its sidewall to detach from the first surface 11 of the housing 1. Simultaneously, the moving mold 22 drive component moves the drive rod 33 along the mold opening direction. Since the second ejector pin 32 is located inside the first ejector pin 31, the first ejector pin 31 compresses the second ejector pin 32 during its movement. With the cooperation of the limiting structure 34, the second ejector pin 32 moves in a second direction perpendicular to the mold opening direction, i.e., the second ejector pin 32 moves to the left and downward, causing the second mating part 321 to disengage from the inner undercut 14. The second mating part 321 is located to the left and below the inner undercut 14, thus achieving demolding of the housing 1. At this point, the robotic arm moves the housing 1 along the mold opening direction and then along either the first or second direction perpendicular to the mold opening direction, allowing the housing 1 to be removed.

[0038] In other embodiments, after the housing 1 is demolded, the housing 1 can be moved along the mold opening direction by the ejection mechanism inside the moving mold 22, and the housing 1 can be removed by the robot arm moving the housing 1 along a first direction or a second direction perpendicular to the mold opening direction.

[0039] Combination Figure 4In this embodiment, a sliding block 312 is inclinedly provided on the first ejector rod 31 along the mold opening direction. The distance between the sliding block 312 and the first surface 11 of the housing 1 gradually increases along the moving direction of the drive rod 33. A groove is provided on the moving mold core 221 to slide and engage with the sliding block 312, so that the first ejector rod 31 can move in a first direction perpendicular to the mold opening direction under the driving action of the mold drive component. In other embodiments, a groove is inclinedly provided on the first ejector rod 31 along the mold opening direction, and a sliding block 312 extending into the groove is provided on the moving mold core 221.

[0040] It should be noted that a fixing rod 35 is provided between the first ejector rod 31 and the mold drive component. The fixing rod 35 is arranged along the mold opening direction, and the side wall of the first ejector rod 31 near the drive rod 33 is inclined to the mold opening direction and abuts against the moving mold core 22. The thickness of the first ejector rod 31 gradually increases along the moving direction of the drive rod 33. After cooperating with the sliding block 312 groove, it helps the first ejector rod 31 to move in the mold opening direction and the first direction perpendicular to the mold opening direction under the driving action of the mold drive component. Furthermore, the first ejector rod 31 is in close contact with the moving mold core 22, which can improve the stability of the movement of the first ejector rod 31.

[0041] In other embodiments, a diagonal bar is provided between the first ejector rod 31 and the mold drive component. The diagonal bar is inclined along the mold opening direction, that is, the distance between the diagonal bar and the first surface 11 of the housing 1 gradually increases along the moving direction of the drive rod 33, so as to drive the first ejector rod 31 to move simultaneously in the mold opening direction and in a first direction perpendicular to the mold opening direction.

[0042] Furthermore, a clearance groove 313 is provided on the side wall of the first ejector rod 31 near the drive rod 33. The clearance groove 313 extends along the mold opening direction. When the first ejector rod 31 moves, the drive rod 33 is located within the clearance groove 313, and there is a gap between the drive rod 33 and the bottom wall of the clearance groove 313, which is greater than the length of the inner undercut 14. By providing a clearance groove 313 on the first ejector rod 31, the stroke requirements of the first ejector rod 31 can be met, while reducing the space occupied by the first ejector rod 31 and the drive rod 33.

[0043] When the first ejector rod 31 moves in the mold opening direction under the driving action of the mold drive component, the first ejector rod 31 also moves in the first direction perpendicular to the mold opening direction under the sliding engagement of the first ejector rod 31 and the moving mold core 221. At this time, the distance between the first ejector rod 31 and the drive rod 33 gradually decreases, and the drive rod 33 extends into the relief groove 313 so that the first ejector rod 31 can continue to move until the inner undercut 14 is completely disengaged from the second mating part 321.

[0044] In this embodiment, the depth of the relief groove 313 gradually increases along the moving direction of the drive rod 33, that is, the distance between the drive rod 33 and the bottom wall of the relief groove 313 remains consistent, which can reduce production costs while meeting the stroke requirements of the first push rod 31.

[0045] Combination Figure 5 and Figure 6 While the first ejector rod 31 moves, it presses against the second ejector rod 32, and with the cooperation of the limiting structure 34, the second ejector rod 32 moves in a second direction perpendicular to the mold opening direction, that is, the second ejector rod 32 moves to the lower left. The limiting structure 34 includes a limiting block 341 on the second ejector rod 32, and a limiting groove 342 on the drive rod 33 along the second direction perpendicular to the mold opening direction for the limiting block 341 to slide. Through the cooperation of the limiting block 341 and the limiting groove 342, the second ejector rod 32 can be driven to move both along the mold opening direction and in the second direction perpendicular to the mold opening direction. Furthermore, the length of the limiting groove 342 along the second direction perpendicular to the mold opening direction is greater than the length of the undercut, ensuring that the second mating part 321 on the second ejector rod 32 can be smoothly pulled out from the inner undercut 14.

[0046] Since the first ejector rod 31 has a mounting groove for the second ejector rod 32 to pass through, when the first ejector rod 31 moves in a first direction perpendicular to the mold opening direction, the first ejector rod 31 presses the second ejector rod 32 in the mounting groove, and with the cooperation of the limiting block 341 and the limiting groove 342, it drives the second ejector rod 32 to move along the limiting groove 342 in a second direction perpendicular to the mold opening direction until the second mating part 321 is smoothly pulled out from the inner undercut 14.

[0047] The limiting groove 342 extends to both ends of the drive rod 33, which facilitates the installation and disassembly of the limiting block 341 and the second push rod 32. Different second push rods 32 can be replaced according to the shape of the inner barb, which can not only facilitate operation but also reduce production costs.

[0048] In addition, the demolding mechanism 3 also includes an ejector plate 36, which is movably disposed in the moving mold 22 along the mold opening direction. The moving mold 22 has a space for the ejector plate 36 to move, and this space is greater than the depth of the inner undercut 14 and the outer undercut 15. The ejector plate 36 is connected to the mold drive component, and the first ejector rod 31 and the ejector rod are both fixedly disposed on the ejector plate 36.

[0049] When the moving mold 22 and the fixed mold 21 open, the mold drive component drives the ejector plate 36 to move along the mold opening direction, thereby driving the first ejector rod 31 and the drive rod 33 to move along the mold opening direction. Due to the sliding fit between the first ejector rod 31 and the moving mold core 221, the first ejector rod 31 moves in the mold opening direction and also moves in a first direction perpendicular to the mold opening direction, which facilitates the side wall of the first ejector rod 31 to detach from the first surface 11 of the shell 1 and the first mating part 311 to detach from the outer undercut 15. At the same time, the drive rod 33 drives the second ejector rod 32 to move along the mold opening direction. Since the second ejector rod 32 is set inside the first ejector rod 31, the first ejector rod 31 squeezes the second ejector rod 32 during the movement, and with the cooperation of the limiting block 341 and the limiting groove 342, it drives the second ejector rod 32 to move in a second direction perpendicular to the mold opening direction, so that the second mating part 321 detaches from the inner undercut 14, thereby realizing the demolding of the shell 1.

[0050] Based on the above-mentioned demolding mechanism, this application also discloses a mold, including a movable mold 22 and a fixed mold 21 that cooperate with each other. Four sliders 23 are movably disposed within the movable mold 22, and each slider 23 has a partial product cavity formed on its inner side, which is paired with the partial product cavities of the movable mold 22 and the fixed mold 21 to form a complete molding cavity. Four inclined guide pillars are fixedly installed within the fixed mold 21, and the inclined guide pillars are slidably disposed with their corresponding sliders 23. When the movable mold 22 and the fixed mold 21 open, the sliders 23 move with the movable mold 22, and relative sliding occurs between them and the inclined guide pillars, causing the sliders 23 to move away from the product, so that the molded product is exposed.

[0051] It should be noted that the opening and closing of the moving mold 22 and the fixed mold 21 are achieved by the mold drive component, which can be set as the hydraulic system or electric system of the injection molding machine.

[0052] The moving mold 22 is also provided with a moving mold core 221, and the demolding mechanism 3 is provided inside the moving mold 22.

[0053] During injection molding, the molten plastic injected from the nozzle of the injection molding machine enters the molding cavity through the main runner. After the molten plastic fills the molding cavity and undergoes pressure holding, shrinkage compensation, and cooling and solidification, the mold drive component drives the moving mold 22 to move along the mold opening direction. At the same time, relative sliding occurs between the slider 23 and the corresponding inclined guide post, causing the slider 23 to move away from the product. When the moving mold 22 and the fixed mold 21 separate, the molded shell 1 is exposed. At this time, the molded shell 1 is fitted outside the moving mold core 221 and the first ejector pin 31.

[0054] After the moving mold 22 and the fixed mold 21 are opened, the demolding mechanism 3 installed inside the moving mold 22 will move relative to other parts of the moving mold 22 under the driving action of the mold driving component, and remove the shell 1 from the moving mold 22 to achieve complete demolding of the shell 1.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A demolding mechanism, characterized in that: It includes a first ejector rod and a second ejector rod. The side wall of the first ejector rod is provided with a first mating part with an external undercut structure. One end of the first ejector rod is connected to the mold drive component so that the first ejector rod can move simultaneously in the mold opening direction and in a first direction perpendicular to the mold opening direction under the action of the mold drive component. The second ejector pin is set along a first direction perpendicular to the mold opening direction and is inclined to a first plane perpendicular to the mold opening direction. One end of the second ejector pin is connected to a drive rod, and the other end extends into the first ejector pin and is provided with a second mating part with an internal undercut. The other end of the drive rod is connected to the mold drive component, and a limiting structure is provided between the drive rod and the second ejector rod. The second ejector rod moves in the mold opening direction under the action of the mold drive component and the drive rod, and moves in a second direction perpendicular to the mold opening direction under the action of the limiting structure and the first ejector rod, so that the second mating part disengages from the inner undercut.

2. The demolding mechanism according to claim 1, characterized in that: The distance between the first push rod and the drive rod is greater than the length of the outer undercut.

3. The demolding mechanism according to claim 2, characterized in that: The first ejector pin is inclined to the side wall near the drive rod and abuts against the moving mold core of the mold. The thickness of the first ejector pin gradually increases along the moving direction of the drive rod. A sliding member inclined along the mold opening direction is provided between the first ejector pin and the moving mold core.

4. The demolding mechanism according to claim 3, characterized in that: The sliding component includes a sliding block disposed on the first ejector rod, the sliding block being inclined along the mold opening direction, and a groove being provided on the mold core of the mold to slide and engage with the sliding block; or, the sliding component includes a sliding block disposed on the mold core of the mold, the sliding block being inclined along the mold opening direction, and a groove being provided on the first ejector rod inclined along the mold opening direction.

5. A demolding mechanism according to claim 4, characterized in that: The distance between the sliding block and the driving block gradually decreases along the direction of movement of the driving rod.

6. A demolding mechanism according to claim 3, characterized in that: The first ejector pin has a relief groove on its side wall near the drive pin. The relief groove extends along the mold opening direction, and the drive pin is located in the relief groove when the first ejector pin moves.

7. A demolding mechanism according to claim 6, characterized in that: The depth of the clearance groove gradually increases along the moving direction of the drive rod.

8. A demolding mechanism according to claim 1, characterized in that: The limiting structure includes a limiting block disposed on the second push rod, and a limiting groove for the limiting block to slide is disposed on the drive rod along a second direction perpendicular to the mold opening direction, and the length of the limiting groove along the second direction perpendicular to the mold opening direction is greater than the length of the inner undercut. Alternatively, the limiting structure includes a limiting block disposed on the drive rod, the limiting block extending along a second direction perpendicular to the mold opening direction, and a sliding groove provided on the second push rod for the limiting block to slide, the length of the limiting block along the second direction perpendicular to the mold opening direction being greater than the length of the inner undercut.

9. A demolding mechanism according to claim 1, characterized in that: It also includes an ejector plate, which is connected to the mold drive components. The first ejector rod and the drive rod are both fixedly mounted on the ejector plate.

10. A demolding mechanism according to claim 9, characterized in that: The distance the ejector plate moves along the mold opening direction is greater than the depth of the inner undercut.

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