Automobile subwoofer shell mold

Abstract

The utility model relates to the technical field of dies, in particular to an automobile subwoofer shell die. Comprising an upper die, a lower die, a lower die seat plate and a supporting bottom plate which are sequentially arranged from top to bottom, a sprue gate is formed in the top end of the upper die, a male die core and a female die core are arranged on the opposite sides of the upper die and the lower die respectively, the sprue gate penetrates through the male die core and is communicated with the female die core, and the lower die seat plate is arranged on the supporting bottom plate. The lower mold seat plate is provided with a plugging ejection assembly for plugging an inner hole of the female mold core, and the upper mold and the lower mold are internally provided with a disassembling assembly for disassembling the lower mold. According to the automobile subwoofer shell mold provided by the utility model, a forming hole in the female mold core is blocked through the design of the blocking and ejecting assembly, so that the normal operation of injection molding work is ensured, and the lower mold I and the lower mold II can be separated from the side wall of an automobile subwoofer shell only by lifting the upper mold through the design of the disassembling assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a shell mold for an automobile subwoofer. Background Art

[0002] An injection mold is a tool for producing plastic products. It is also a tool that gives plastic products a complete structure and precise dimensions. Injection molding is a processing method used in mass production of certain parts with complex shapes. Specifically, it refers to the process of injecting heated and melted plastic into the mold cavity under high pressure by an injection molding machine, and obtaining a molded product after cooling and solidification.

[0003] In the prior art, the car subwoofer shell is mostly mass-produced by injection molds due to its complex shape. After the car subwoofer shell is formed, the ejector pin at the bottom of the injection mold is driven by mechanical force or pneumatic force to eject the car subwoofer shell, thereby realizing rapid demoulding of the car subwoofer shell in the injection mold.

[0004] However, in actual use, we found that when there is an L-shaped or U-shaped plate structure at the bottom or both sides of the car subwoofer shell, it is necessary to use corresponding blocking blocks to block the hollow part of the L-shaped or U-shaped plate structure to ensure the normal injection molding of the car subwoofer shell. Since the blocking block is stuck in the inside of the L-shaped or U-shaped plate structure, the injection-molded car subwoofer shell cannot be ejected from the inside of the mold only by the ejector pin at the bottom of the mold. The operator needs to split the lower mold first to remove the blocking block from the L-shaped or U-shaped plate structure before pushing the ejector pin plate to eject the molded car subwoofer shell. The whole process is relatively cumbersome and the practical performance of the device is poor.

[0005] To this end, we designed a car subwoofer shell mold to provide another technical solution to the above technical problems. Utility Model Content

[0006] Based on this, it is necessary to provide a car subwoofer shell mold that is convenient for ejecting the car subwoofer shell in order to solve the above technical problems.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] A car subwoofer shell mold, comprising an upper mold, a lower mold, a lower mold base plate and a supporting bottom plate, wherein the upper mold, the lower mold, the lower mold base plate and the supporting bottom plate are arranged in sequence from top to bottom, a pouring port is provided at the top of the upper mold, a male mold core and a female mold core matching the outer shape of the car subwoofer shell are respectively provided on the opposite sides of the upper mold and the lower mold, the pouring port passes through the male mold core and is connected with the female mold core, a plugging and ejecting component for plugging the internal holes of the female mold core is provided on the lower mold base plate, and a splitting component for splitting the lower mold is provided inside the upper mold and the lower mold.

[0009] Preferably, a plurality of guide pillars are fixedly provided on the circumferential side of the upper mold, a plurality of guide sleeves matching the guide pillars are provided on the lower mold, the plugging and ejection assembly comprises a lower mold body, lower mold one, lower mold two and lower mold three, the lower mold is formed by splicing the lower mold body, lower mold one, lower mold two and lower mold three, the lower mold one, lower mold two and lower mold three are slidably arranged on the lower mold, a plurality of plugging molding ejector pins one for sealing the holes on the side surfaces of the female mold core are provided inside the lower mold one, lower mold two and lower mold three, and a plurality of the plugging molding ejector pins one are fixedly arranged inside the lower mold one, lower mold two and lower mold three.

[0010] Preferably, the blocking and ejection assembly also includes a plurality of blocking molding ejector pins 2 arranged on the supporting bottom plate for sealing the holes at the bottom end of the female mold core, the lower mold base plate is provided with a plurality of through holes 1 matching the blocking molding ejector pins 2 for facilitating the passage of the blocking molding ejector pins 2, the lower mold base plate is also provided with a plurality of ejector rods for ejecting the car subwoofer shell, and the plurality of ejector rods are evenly distributed at the bottom of the car subwoofer shell.

[0011] Preferably, the lower die base plate is provided with a plurality of mounting holes matching the ejector rod, a section of the ejector rod located in the mounting hole is fixedly provided with an abutment ring, a compression spring for pushing the ejector rod is provided inside the mounting hole, two ends of the compression spring are respectively fixedly connected to the abutment ring and the inner wall of the mounting hole, a plurality of inclined pin seats are fixedly provided inside the lower die base plate, a plurality of the inclined pin seats are rotatably connected inside with a guide rod, an end of the guide rod away from the inclined pin seat is fixedly provided with an inclined pin for sealing the bottom of the female mold core, and the inclined pin is slidably clamped inside the lower die body.

[0012] Preferably, the splitting assembly includes a plurality of mounting blocks fixed inside the upper mold, a prying rod is fixedly connected to a side of the mounting block close to the lower mold, and through hole two matching the prying rod is provided on lower mold one and lower mold two, and one end of the prying rod close to lower mold one and lower mold two passes through through hole two and extends to the outside of lower mold one and lower mold two.

[0013] Preferably, the disassembly assembly also includes a U-shaped mounting block arranged on one side of the lower mold three, the lower mold main body and the U-shaped mounting block are provided with guide rails for facilitating the sliding of the lower mold three, the lower mold three is slidably arranged on the guide rails, an electric cylinder is provided on the side of the U-shaped mounting block away from the lower mold three, the output end of the electric cylinder is fixedly connected with a T-shaped clamping block, the lower mold three is provided with a T-shaped slot matching the T-shaped clamping block, and the T-shaped clamping block is clamped in the T-shaped slot.

[0014] It can be seen without a doubt that the above-mentioned technical solution of the present application can definitely solve the technical problem to be solved by the present application.

[0015] At the same time, through the above technical solutions, the utility model has at least the following beneficial effects:

[0016] 1. The utility model provides a car subwoofer shell mold, which blocks the molding holes inside the injection mold for molding the car subwoofer shell through the design of a blocking ejection component, thereby preventing the injection liquid from flowing out of the injection mold through the holes during injection molding, thereby ensuring the normal progress of the injection molding work.

[0017] 2. The utility model provides a car subwoofer shell mold. Through the design of split components, the operator only needs to lift the upper mold upward to separate it from the lower mold, and then the lower mold 1 and the lower mold 2 can be separated from the side wall of the car subwoofer shell, so as to facilitate the subsequent normal ejection of the car subwoofer shell, thereby improving the convenience of car subwoofer shell production.

[0018] 3. The utility model provides a car subwoofer shell mold. Through the design of the electric cylinder and the T-shaped clamp, the operator only needs to start the electric cylinder and pull the T-shaped clamp fixedly connected to its output end outward to separate the lower mold three from the side wall of the car subwoofer shell, thereby avoiding movement interference caused by the ejector plate ejecting the car subwoofer shell, and effectively ensuring the normal use of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the axial structure of the utility model;

[0021] Figure 2 It is a right view structural schematic diagram of the utility model;

[0022] Figure 3 It is a cross-sectional structural schematic diagram of the utility model;

[0023] Figure 4 It is a structural schematic diagram of the upper mold and the lower mold of the utility model in a separated state;

[0024] Figure 5 This is a schematic diagram of the split structure of the lower mold of the utility model;

[0025] Figure 6 It is a schematic diagram of the top view of the lower mold of the utility model;

[0026] Figure 7It is a structural schematic diagram of the automobile subwoofer shell in the ejected state of the utility model;

[0027] Figure 8 It is a schematic diagram of the matching structure of the ejector rod and the lower die base plate of the utility model;

[0028] Fig. 9 It is a schematic diagram of the matching structure of the oblique pin seat, the guide rod and the oblique pin of the utility model.

[0029] In the figure: 1. upper mold; 2. lower mold; 3. lower mold base plate; 4. supporting bottom plate; 5. pouring gate; 6. male mold core; 7. female mold core; 8. guide pillar; 9. guide sleeve; 10. lower mold body; 11. lower mold one; 12. lower mold two; 13. lower mold three; 15. plugging molding ejector pin one; 16. plugging molding ejector pin two; 17. through hole one; 18. ejector rod; 19. mounting hole; 20. abutment ring; 21. compression spring; 22. oblique pin seat; 23. guide rod; 24. oblique pin; 25. mounting block; 26. pry rod; 27. through hole two; 28. U-shaped mounting block; 29. ​​guide rail; 30. electric cylinder; 31. T-shaped clamping block; 32. T-shaped clamping groove. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0031] Example

[0032] Reference Figure 1-9 A car subwoofer shell mold, comprising an upper mold 1, a lower mold 2, a lower mold base plate 3 and a supporting bottom plate 4, wherein the upper mold 1, the lower mold 2, the lower mold base plate 3 and the supporting bottom plate 4 are arranged in sequence from top to bottom, a pouring port 5 is provided at the top of the upper mold 1, a male mold core 6 and a female mold core 7 matching the shape of the car subwoofer shell are respectively provided on the opposite sides of the upper mold 1 and the lower mold 2, the pouring port 5 passes through the male mold core 6 and is connected with the female mold core 7, a plugging and ejecting component for plugging the internal holes of the female mold core 7 is provided on the lower mold base plate 3, and a splitting component for splitting the lower mold 2 is provided inside the upper mold 1 and the lower mold 2.

[0033] Reference Figure 2-6The upper mold 1 is fixed with a plurality of guide pillars 8 on the circumferential side, and the lower mold 2 is provided with a plurality of guide sleeves 9 matching the guide pillars 8. The plugging and ejecting assembly includes a lower mold body 10, a lower mold 1 11, a lower mold 2 12 and a lower mold 3 13. The lower mold 2 is spliced ​​by the lower mold body 10, the lower mold 1 11, the lower mold 2 12 and the lower mold 3 13. The lower mold 1 11, the lower mold 2 12 and the lower mold 3 13 are slidably arranged on the lower mold 2. The lower mold 1 11, the lower mold 2 12 and the lower mold 3 13 are provided with a plurality of plugging molding ejector pins 15 for plugging the holes on the side of the female mold core 7. The blocking molding ejector pin 15 is fixedly arranged inside the lower mold 11, the lower mold 2 12 and the lower mold 3 13. Specifically, in the utility model, the relative movement between the upper mold 1 and the lower mold 2 is smoother through the design of the guide column 8 and the guide sleeve 9, thereby improving the stability of the cooperation between the upper mold 1 and the lower mold 2. Through the design of the blocking molding ejector pin 15, the molding hole opened on the side wall of the mother mold core 7 is effectively blocked, thereby preventing the injection liquid flowing in from the pouring port 5 during injection molding from flowing out of the injection mold through the molding hole opened on the side wall of the mother mold core 7, thereby ensuring the normal progress of the injection molding work.

[0034] Reference Figure 2-6 The plugging and ejecting assembly also includes a plurality of plugging molding ejector pins 16 disposed on the supporting bottom plate 4 for plugging the holes at the bottom end of the mold core, and the lower mold base plate 3 is provided with a plurality of through holes 17 matching the plugging molding ejector pins 16 for passing the plugging molding ejector pins 16, and the lower mold base plate 3 is also provided with a plurality of ejector rods 18 for ejecting the shell of the automobile subwoofer, and the plurality of ejector rods 18 are evenly distributed at the bottom of the shell of the automobile subwoofer. Specifically, in the utility model, the molding hole opened on the bottom wall of the mother mold core 7 is effectively blocked by the design of the plugging molding ejector pins 16, so as to prevent the injection liquid flowing in from the pouring port 5 during the injection molding from flowing out of the injection mold through the molding hole opened on the bottom wall of the mother mold core 7, thereby further ensuring the normal progress of the injection molding work;

[0035] It should be noted that, in the utility model, the injection molding machine is provided with an ejector cylinder which cooperates with the lower mold base plate 3 and the ejector rod 18. Through this design, the lower mold base plate 3 placed on the bottom plate of the upper mold 1 is ejected upward, so that the ejector rod 18 ejects the injection-molded car subwoofer shell out of the lower mold 2, thereby realizing the rapid demolding of the car subwoofer shell.

[0036] Reference Figure 7-9The lower die base plate 3 is provided with a plurality of mounting holes 19 matching the ejector rod 18, a section of the ejector rod 18 located in the mounting hole 19 is fixedly provided with an abutment ring 20, a compression spring 21 is provided inside the mounting hole 19 for pushing the ejector rod 18, and the two ends of the compression spring 21 are respectively fixedly connected to the abutment ring 20 and the inner wall of the mounting hole 19, a plurality of inclined pin seats 22 are fixedly provided inside the lower die base plate 3, and a plurality of the inclined pin seats 22 are rotatably connected inside with a guide rod 23, and an end of the guide rod 23 away from the inclined pin seat 22 is fixedly provided with an inclined pin 24 for blocking the bottom of the female mold core 7, and the inclined pin 24 is slidably carded inside the lower die body 10. Specifically, the utility model In the mold, through the design of the mounting hole 19, the abutment ring 20, the compression spring 21, the oblique pin seat 22, the guide rod 23 and the oblique pin 24, the abutment ring 20 at the bottom of the ejector rod 18 can first squeeze the compression spring 21 to a certain extent during the upward lifting of the lower mold base plate 3. In this process, the top of the ejector rod 18 always conflicts with the bottom wall of the car subwoofer shell and does not eject the car subwoofer shell upward. When the oblique pin 24 is completely pulled out of the molding hole at the bottom end of the car subwoofer shell, the ejector rod 18 quickly pops up under the action of the compression spring 21, and cooperates with the continuous lifting of the lower mold base plate 3 to eject the car subwoofer shell in the lower mold 2, completing the rapid demolding of the car subwoofer shell after injection molding;

[0037] It should be noted that, in the present invention, the abutment ring 20 is clamped in the mounting hole 19, and when the ejection rod 18 is in a free state and abuts against the bottom wall of the car subwoofer shell, the abutment ring 20 abuts against the top wall of the mounting hole 19 under the action of the compression spring 21. Through this design, a certain displacement margin is provided for the ejection rod 18, so that the oblique pin 24 clamped at the bottom of the car subwoofer shell can be pulled out of the car subwoofer shell within the range of the displacement margin, thereby effectively avoiding the motion interference generated during the demolding process of the car subwoofer shell and improving the practical performance of the device; on the other hand, the oblique pin 24 is slidably clamped inside the lower mold body 10, and can only make horizontal translational motion along the lower mold body 10, thereby ensuring the normal use of the blocking ejection assembly.

[0038] Reference Figure 3-6, the splitting assembly includes a plurality of mounting blocks 25 fixedly arranged inside the upper mold 1, a prying rod 26 is fixedly connected to one side of the mounting block 25 close to the lower mold 2, a through hole 27 matching the prying rod 26 is provided on the lower mold 1 11 and the lower mold 2 12, and one end of the prying rod 26 close to the lower mold 1 11 and the lower mold 2 12 passes through the through hole 27 and extends to the outside of the lower mold 1 11 and the lower mold 2 12. Specifically, in the utility model, through the design of the mounting block 25, the prying rod 26, and the through hole 27, when the staff needs to demould the automobile subwoofer shell after injection molding, they only need to lift the upper mold 1 upwards, and the lower mold 1 11 and the lower mold 2 12 can be split from the lower mold body 10 through the design of the prying rod 26, so that the lower mold 1 11 and the lower mold 2 12 are completely pulled out from the side wall of the automobile subwoofer shell, which is convenient for the subsequent further demoulding of the automobile subwoofer shell;

[0039] It should be noted that, in the present invention, after the lower mold 11 and the lower mold 2 are completely separated from the side wall of the car subwoofer shell, the distance between the upper mold 1 and the lower mold 2 is greater than the height of the car subwoofer shell. Through this design, without affecting the rapid demolding of the car subwoofer shell, the prying rod 26 on the upper mold 1 can always be in the through hole 27, which is convenient for the rapid resetting of the lower mold 11 and the lower mold 2, thereby improving the practical performance of the device.

[0040] Reference Figure 5-6 The splitting assembly also includes a U-shaped mounting block 28 disposed on one side of the lower mold three 13. The lower mold body 10 and the U-shaped mounting block 28 are provided with a guide rail 29 for facilitating the sliding of the lower mold three 13. The lower mold three 13 is slidably arranged on the guide rail 29. The U-shaped mounting block 28 is provided with an electric cylinder 30 on the side away from the lower mold three 13. The output end of the electric cylinder 30 is fixedly connected with a T-shaped card block 31. The lower mold three 13 is provided with a T-shaped card slot 32 matching the T-shaped card block 31. The T-shaped card block 31 is clamped on the T-shaped card slot. In the card slot 32, specifically, in the utility model, through the design of the U-shaped mounting block 28, the guide rail 29, the T-shaped card block 31 and the electric cylinder 30, the lower mold 3 13 is conveniently disassembled on the lower mold body 10, so that the lower mold 3 13 is completely pulled out from the side wall of the car subwoofer shell, which is convenient for the subsequent blocking and lifting assembly to lift and demould the car subwoofer shell, ensuring the steady progress of the demoulding process, and through the design of the guide rail 29, the lower mold 3 13 moves more smoothly on the lower mold body 10 and the U-shaped mounting block 28, thereby improving the practicality of the device;

[0041] It should be noted that in the present invention, since the side wall of the car subwoofer shell opposite to the lower mold three 13 is longer, the design of the mounting block 25, the prying rod 26 and the through hole two 27 cannot completely separate the lower mold three 13 from the side wall of the car subwoofer shell. Therefore, the design of the U-shaped mounting block 28, the guide rail 29, the T-shaped clamping block 31 and the electric cylinder 30 is adopted to completely separate the lower mold three 13 from the car subwoofer shell, thereby ensuring the normal lifting of the subsequent blocking and ejection components.

[0042] The use process of the automobile subwoofer shell mold provided by the utility model is as follows:

[0043] When demolding the car subwoofer shell after injection molding, the staff controls the injection molding machine to lift the upper mold 1 upward, so that the lower mold 1 11 and the lower mold 2 12 move to the side away from the car subwoofer shell under the action of the prying rod 26, and completely separate from the side wall of the car subwoofer shell, and then start the electric cylinder 30, so that the electric cylinder 30 drives the T-shaped block 31 connected to its output end to contract, thereby driving the lower mold 3 13 clamped by the T-shaped block 31 to move, so that the lower mold 3 13 is completely separated from the side wall of the car subwoofer shell, and then start the ejection cylinder on the injection molding machine to drive the lower mold base plate 3 to The ejector rod 18 is lifted up to pull the inclined pin 24 out of the forming hole at the bottom end of the car subwoofer shell. During this process, the abutment ring 20 at the bottom of the ejector rod 18 first squeezes the compression spring 21 to a certain extent, so that the top end of the ejector rod 18 always contacts the bottom wall of the car subwoofer shell and does not push the car subwoofer shell upward. When the inclined pin 24 is completely pulled out of the forming hole at the bottom end of the car subwoofer shell, the ejector rod 18 pops up quickly under the action of the compression spring 21, and cooperates with the continuous lifting of the lower mold base plate 3 to eject the car subwoofer shell in the lower mold 2, thereby completing the rapid demolding of the car subwoofer shell after injection molding.

[0044] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A car subwoofer shell mold, comprising an upper mold (1), a lower mold (2), a lower mold base plate (3) and a supporting bottom plate (4), wherein the upper mold (1), the lower mold (2), the lower mold base plate (3) and the supporting bottom plate (4) are arranged in sequence from top to bottom, and characterized in that: The top of the upper mold (1) is provided with a pouring port (5), and the sides of the upper mold (1) and the lower mold (2) opposite to each other are respectively provided with a male mold core (6) and a female mold core (7) matching the outer shape of the automobile subwoofer shell, the pouring port (5) penetrates through the male mold core (6) and is connected to the female mold core (7), the lower mold base plate (3) is provided with a plugging and ejecting component for plugging the internal holes of the female mold core (7), and the upper mold (1) and the lower mold (2) are provided with a splitting component for splitting the lower mold (2).

2. The automotive subwoofer shell mold according to claim 1, characterized in that: A plurality of guide pillars (8) are fixedly arranged on the circumferential side of the upper mold (1); a plurality of guide sleeves (9) matching the guide pillars (8) are arranged on the lower mold (2); the plugging and ejecting assembly comprises a lower mold body (10), a lower mold one (11), a lower mold two (12) and a lower mold three (13); the lower mold (2) is formed by splicing the lower mold body (10), the lower mold one (11), the lower mold two (12) and the lower mold three (13); the lower mold one (11), the lower mold two (12) and the lower mold three (13) are slidably arranged on the lower mold (2); a plurality of plugging molding ejector pins (15) for plugging the side holes of the female mold core (7) are arranged inside the lower mold one (11), the lower mold two (12) and the lower mold three (13); the plurality of plugging molding ejector pins (15) are fixedly arranged inside the lower mold one (11), the lower mold two (12) and the lower mold three (13).

3. The automotive subwoofer shell mold according to claim 2, characterized in that: The blocking and ejection assembly also includes a plurality of blocking molding ejector pins (16) disposed on the supporting bottom plate (4) for blocking the holes at the bottom end of the female mold core (7); the lower mold base plate (3) is provided with a plurality of through holes (17) matching the blocking molding ejector pins (16) for facilitating the passage of the blocking molding ejector pins (16); the lower mold base plate (3) is also provided with a plurality of ejection rods (18) for ejecting the automobile subwoofer shell; the plurality of ejection rods (18) are evenly distributed at the bottom of the automobile subwoofer shell.

4. The automotive subwoofer shell mold according to claim 3, characterized in that: The lower die base plate (3) is provided with a plurality of mounting holes (19) matching the ejector rod (18); a section of the ejector rod (18) located in the mounting hole (19) is fixedly provided with an abutment ring (20); a compression spring (21) is provided inside the mounting hole (19) for pushing the ejector rod (18); two ends of the compression spring (21) are respectively fixedly connected to the abutment ring (20) and the inner wall of the mounting hole (19); a plurality of inclined pin seats (22) are fixedly provided inside the lower die base plate (3); a plurality of inclined pin seats (22) are rotatably connected inside with a guide rod (23); an end of the guide rod (23) away from the inclined pin seat (22) is fixedly provided with an inclined pin (24) for blocking the bottom of the female mold core (7); the inclined pin (24) is slidably clamped inside the lower die body (10).

5. The automotive subwoofer shell mold according to claim 2, characterized in that: The splitting assembly comprises a plurality of mounting blocks (25) fixedly arranged inside the upper mold (1); a prying rod (26) is fixedly connected to a side of the mounting block (25) close to the lower mold (2); a through hole (27) matching the prying rod (26) is provided on the lower mold (11) and the lower mold (12); an end of the prying rod (26) close to the lower mold (11) and the lower mold (12) passes through the through hole (27) and extends to the outside of the lower mold (11) and the lower mold (12).

6. The automotive subwoofer shell mold according to claim 5, characterized in that: The disassembly assembly further comprises a U-shaped mounting block (28) arranged on one side of the lower mold three (13); a guide rail (29) is arranged on the lower mold body (10) and the U-shaped mounting block (28) for facilitating the sliding of the lower mold three (13); the lower mold three (13) is slidably arranged on the guide rail (29); an electric cylinder (30) is arranged on the side of the U-shaped mounting block (28) away from the lower mold three (13); a T-shaped clamping block (31) is fixedly connected to the output end of the electric cylinder (30); a T-shaped clamping groove (32) matching the T-shaped clamping block (31) is opened on the lower mold three (13); and the T-shaped clamping block (31) is clamped in the T-shaped clamping groove (32).

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