Cutting device for mold production

Abstract

The cutting device for mold production comprises a box body, a workbench, a bent plate and a cutting machine, the workbench is fixedly connected to the top of the box body, the bent plate is fixedly connected to the top of the workbench, a clamping assembly is installed on the top of the workbench, and a lifting assembly is installed on the outer wall of the workbench. According to the device, the clamping jaw is arranged, the clamping jaw is composed of the shell, the movable plate, the limiting plate, the frame and the clamping plate, and one end of the air pipe communicates with the interior of the shell, so that air in the shell can be pumped out through the air pipe, a negative pressure area is formed in the shell, and suction force is generated on the limiting plate; due to the fact that the outer wall of the limiting plate is fixedly connected with the outer wall of the movable plate, and the side, away from the limiting plate, of the movable plate is fixedly connected with the outer wall of the clamping plate, the limiting plate can drive the clamping plate to move through the movable plate till the outer wall of the clamping plate abuts against the outer wall of the mold, and clamping and fixing of the mold are completed.

Description

Technical Field

[0001] This invention relates to the field of mold manufacturing technology, specifically to a cutting device for mold manufacturing. Background Technology

[0002] Molds are various molds and tools used in industrial production to obtain desired products through methods such as injection molding, blow molding, extrusion, die casting, forging, smelting, and stamping. In short, molds are tools used to make shaped objects. These tools are composed of various parts, and different molds are composed of different parts. They mainly achieve the processing of the shape of the object by changing the physical state of the material being molded. They are tools that make blanks into parts with specific shapes and sizes under the action of external forces. They are widely used in blanking, die forging, cold heading, extrusion, powder metallurgy parts pressing, pressure casting, and compression molding or injection molding of engineering plastics, rubber, ceramics and other products.

[0003] Chinese Patent Publication No. CN108621309B discloses a cutting device for mold production. A first lead screw and a first moving block drive a moving plate and a fixed block to move, thereby fixing the left and right sides of the mold via the fixed blocks. An electric push rod drives a first piston to move, which in turn drives a second piston via an oil guide pipe, moving a piston rod and a fixed plate to fix the front and rear sides of the mold via the fixed plates. This improves the mold's clamping and fixing effect, preventing mold movement during cutting. The fixed blocks on both sides and the fixed plates on both sides of the fixed blocks can move simultaneously towards the center, ensuring the mold is always positioned in the center of the top surface of the worktable, aligned with the cutting blade, thus improving cutting accuracy.

[0004] When the cutting device in the above application fixes the mold, the first lead screw drives the moving plate to move through the first moving block, and starts the electric push rod, so that the electric push rod transports the liquid inside the first oil chamber to the inside of the second oil chamber through the oil guide pipe, thereby driving the fixed plate to move through the piston rod, thereby clamping the mold. However, the rubber pad in the above application can only expand and cannot contract, which will cause the outer wall of the rubber pad to not abut well against the outer wall of the mold, so it cannot achieve a good clamping effect on the mold. Summary of the Invention

[0005] The purpose of this invention is to provide a cutting device for mold production to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a cutting device for mold production, comprising a housing, a worktable, a bending plate, and a cutting machine. The worktable is fixedly connected to the top of the housing, the bending plate is fixedly connected to the top of the worktable, the cutting machine is installed on the outer wall of the bending plate, the inner wall of the cutting machine is slidably connected to the outer wall of the bending plate, the cutting machine can move on the outer wall of the bending plate, a clamping assembly is installed on the top of the worktable, and a lifting assembly is installed on the outer wall of the worktable.

[0007] The clamping assembly consists of a moving unit and an air extraction unit. The moving unit is located on the top of the worktable, and the air extraction unit is located on the outer wall of the moving unit.

[0008] According to the above technical solution, the moving unit includes a moving plate, an electric push rod, and a gripper. The moving plate is installed on the top of the worktable, the electric push rod is fixedly connected to the top of the moving plate, and the gripper is installed above the moving plate.

[0009] According to the above technical solution, the bottom of the movable plate is slidably connected to the top of the workbench, and the movable plate can slide on the top of the workbench. The start switch of the electric push rod is connected to an external controller signal, and the electric push rod can be controlled by the external controller.

[0010] According to the above technical solution, the gripper is composed of a shell, a movable plate, a limiting plate, a frame, a spring, and a clamping plate. The shell is fixedly connected to the output end of the electric push rod, the movable plate is installed inside the shell, the limiting plate is installed inside the shell, the frame is fixedly connected to the inside of the shell, the spring is fixedly connected to the inner wall of the shell, and the clamping plate is installed on the outer wall of the shell.

[0011] According to the above technical solution, one side of the movable plate penetrates the inner wall of the outer shell and extends to the outer wall of the outer shell. The outer wall of the movable plate is slidably connected to the inner wall of the outer shell through which it is penetrated, allowing the movable plate to move inside the outer shell. The outer wall of the limiting plate is slidably connected to the inner wall of the outer shell, allowing the limiting plate to slide inside the outer shell. One side of the movable plate is fixedly connected to the outer wall of the limiting plate, allowing the movable plate to move. The outer wall of the frame abuts against the outer wall of the limiting plate, allowing the frame to limit the movement of the limiting plate. The side of the spring away from the inner wall of the outer shell is fixedly connected to the outer wall of the limiting plate, allowing the spring to push the limiting plate to reset. The outer wall of the clamping plate is fixedly connected to the outer wall of the movable plate, allowing the movable plate to move.

[0012] According to the above technical solution, the air extraction unit includes an air pipe, a three-way valve, a folded tube, and an air pump. The air pipe is fixedly connected to the top of the gripper, the three-way valve is installed above the electric push rod, the folded tube is fixedly connected to the outer wall of the three-way valve, and the air pump is fixedly connected to the outer wall of the electric push rod.

[0013] According to the above technical solution, one end of the air tube is connected to the inside of the gripper, the outer wall of the three-way valve is fixedly connected to one end of the air tube, the end of the folded tube away from the three-way valve is fixedly connected to the input end of the air pump, and the start switch of the air pump is connected to the signal of an external controller. The air pump can be controlled by the external controller. After the air pump is started, the air inside the gripper can be extracted through the folded tube, the three-way valve and the air tube, thereby clamping the mold.

[0014] According to the above technical solution, the lifting assembly includes a motor, a threaded rod, a vertical rod, an outer ring, and a connecting piece. The motor is fixedly connected to the bottom of the housing, the threaded rod is installed inside the housing, the vertical rod is fixedly connected to the inner wall of the housing, the outer ring is installed on the outer wall of the threaded rod, and the connecting piece is rotatably connected to the outer wall of the outer ring.

[0015] According to the above technical solution, the motor's start switch is connected to an external controller signal, allowing control of the motor via the external controller. The bottom end of the threaded rod is connected to the top output end of the motor. Both the threaded rod and the vertical rod pass through the outer ring. The outer wall of the threaded rod is adapted to the inner wall of the outer ring. After the threaded rod rotates, the outer ring can move under the action of the thread. The inner wall of the outer ring is slidably connected to the outer wall of the vertical rod, allowing the outer ring to move along the outer wall of the vertical rod. The end of the connector away from the outer ring is rotatably connected to the bottom of the moving plate. When the outer ring moves, the connecting piece can drive the moving plate to move.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are: 1. This invention features a gripper, which consists of a shell, a movable plate, a limiting plate, a frame, and a clamping plate. One end of the air pipe is connected to the interior of the shell, allowing air inside the shell to be drawn out through the air pipe, creating a negative pressure area inside the shell. This creates suction on the limiting plate. Since the outer wall of the limiting plate is fixedly connected to the outer wall of the movable plate, and the side of the movable plate away from the limiting plate is fixedly connected to the outer wall of the clamping plate, the limiting plate can move the clamping plate through the movable plate until the outer wall of the clamping plate abuts against the outer wall of the mold, thus completing the clamping and fixing of the mold.

[0017] 2. In this invention, a movable plate, an electric push rod, and a gripper are provided. Since the bottom of the movable plate is slidably connected to the top of the worktable, the movable plate can move on the top of the worktable, thereby driving the electric push rod to move. The output end of the electric push rod is fixedly connected to the outer wall of the gripper. Therefore, after the electric push rod is started, it can push the gripper to move, thereby changing the position of the gripper and facilitating the gripper to clamp and fix the mold.

[0018] 3. This invention, by providing an air pipe, a three-way valve, a folded pipe, and an air pump, allows air to be extracted from the gripper through the air pipe, three-way valve, and folded pipe when the air pump is started. This enables the gripper to clamp the mold. The folded pipe ensures that gas is delivered normally when the gripper moves. Furthermore, a pressure relief pipe is installed on the outer wall of the folded pipe, allowing the air pressure inside the gripper to return to normal after the work is completed.

[0019] 4. This invention comprises a motor, a threaded rod, an outer ring, and a connector. When the motor is started, the threaded rod rotates. Since the outer wall of the threaded rod is adapted to the inner wall of the outer ring, and the outer wall of the vertical rod is slidably connected to the inner wall of the outer ring, the outer ring moves on the outer wall of the threaded rod under the action of the thread. Since one end of the connector is rotatably connected to the outer wall of the outer ring, and the end of the connector away from the outer ring is rotatably connected to the bottom of the moving plate and slidably connected to the inner wall of the worktable, when the outer ring moves, it can push the connector to move inside the worktable and drive the moving plate to move, thereby adjusting the position of the moving plate. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is an overall schematic diagram of the present invention; Figure 2 This is a schematic diagram of the clamping assembly of the present invention; Figure 3 This is a schematic diagram of the inner side of the gripper of the present invention; Figure 4 This is a partial schematic diagram of the gripper of the present invention; Figure 5 This is an overall front view of the present invention; Figure 6 This is a schematic diagram of the interior of the housing of the present invention.

[0021] In the diagram: 1. Housing; 2. Workbench; 3. Bending plate; 4. Cutting machine; 5. Clamping assembly; 501. Moving plate; 502. Electric push rod; 503. Gripper; 504. Air pipe; 505. Three-way valve; 506. Folding pipe; 507. Air pump; 5031. Outer shell; 5032. Movable plate; 5033. Limiting plate; 5034. Frame; 5035. Spring; 5036. Clamping plate; 6. Lifting assembly; 601. Motor; 602. Threaded rod; 603. Vertical rod; 604. Outer ring; 605. Connector. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 1-6 The present invention provides a technical solution: a cutting device for mold production, comprising a housing 1, a workbench 2, a bending plate 3, and a cutting machine 4. The workbench 2 is fixedly connected to the top of the housing 1, the bending plate 3 is fixedly connected to the top of the workbench 2, the cutting machine 4 is installed on the outer wall of the bending plate 3, the inner wall of the cutting machine 4 is slidably connected to the outer wall of the bending plate 3, and the cutting machine 4 can move on the outer wall of the bending plate 3. A clamping assembly 5 is installed on the top of the workbench 2, the clamping assembly 5 is composed of a moving unit and an air extraction unit, the moving unit is located on the top of the workbench 2, the air extraction unit is located on the outer wall of the moving unit, and a lifting assembly 6 is installed on the outer wall of the workbench 2.

[0024] The moving unit includes a moving plate 501, an electric push rod 502, and a gripper 503. The moving plate 501 is mounted on the top of the worktable 2, and the bottom of the moving plate 501 is slidably connected to the top of the worktable 2. The moving plate 501 can slide on the top of the worktable 2. The electric push rod 502 is fixedly connected to the top of the moving plate 501. The start switch of the electric push rod 502 is connected to an external controller signal, and the electric push rod 502 can be controlled by the external controller. The gripper 503 is mounted above the moving plate 501.

[0025] The system includes a movable plate 501, an electric push rod 502, and a gripper 503. Since the bottom of the movable plate 501 is slidably connected to the top of the worktable 2, the movable plate 501 can move on the top of the worktable 2, thereby driving the electric push rod 502 to move. The output end of the electric push rod 502 is fixedly connected to the outer wall of the gripper 503. Therefore, after the electric push rod 502 is started, it can push the gripper 503 to move, thereby changing the position of the gripper 503 and facilitating the gripper 503 to clamp and fix the mold.

[0026] The gripper 503 consists of a housing 5031, a movable plate 5032, a limiting plate 5033, a frame 5034, a spring 5035, and a clamping plate 5036. The housing 5031 is fixedly connected to the output end of the electric push rod 502. The movable plate 5032 is installed inside the housing 5031, with one side penetrating the inner wall of the housing 5031 and extending to the outer wall. The outer wall of the movable plate 5032 is slidably connected to the penetrating inner wall of the housing 5031, allowing the movable plate 5032 to move inside the housing 5031. The limiting plate 5033 is installed inside the housing 5031, with its outer wall slidably connected to the inner wall of the housing 5031, allowing the limiting plate 5033 to slide inside the housing 5031. The movable plate 5031... One side of the movable plate 5032 is fixedly connected to the outer wall of the limiting plate 5033. The movable plate 5032 can drive the limiting plate 5033 to move. The frame 5034 is fixedly connected to the inside of the outer shell 5031. The outer wall of the frame 5034 abuts against the outer wall of the limiting plate 5033. The frame 5034 can limit the limiting plate 5033. The spring 5035 is fixedly connected to the inner wall of the outer shell 5031. The side of the spring 5035 away from the inner wall of the outer shell 5031 is fixedly connected to the outer wall of the limiting plate 5033. The spring 5035 can push the limiting plate 5033 to reset. The clamping plate 5036 is installed on the outer wall of the outer shell 5031. The outer wall of the clamping plate 5036 is fixedly connected to the outer wall of the movable plate 5032. The movable plate 5032 can drive the clamping plate 5036 to move.

[0027] By providing a gripper 503, which is composed of a shell 5031, a movable plate 5032, a limiting plate 5033, a frame 5034, and a clamping plate 5036, and with one end of an air pipe 504 connected to the interior of the shell 5031, air inside the shell 5031 can be drawn out through the air pipe 504, creating a negative pressure area inside the shell 5031, thereby generating suction on the limiting plate 5033. Since the outer wall of the limiting plate 5033 is fixedly connected to the outer wall of the movable plate 5032, and the side of the movable plate 5032 away from the limiting plate 5033 is fixedly connected to the outer wall of the clamping plate 5036, the limiting plate 5033 can drive the clamping plate 5036 to move through the movable plate 5032 until the outer wall of the clamping plate 5036 abuts against the outer wall of the mold, thereby completing the clamping and fixing of the mold.

[0028] The air extraction unit includes an air pipe 504, a three-way valve 505, a folded pipe 506, and an air pump 507. The air pipe 504 is fixedly connected to the top of the gripper 503, and one end of the air pipe 504 communicates with the interior of the gripper 503. The three-way valve 505 is installed above the electric push rod 502, and the outer wall of the three-way valve 505 is fixedly connected to one end of the air pipe 504. The folded pipe 506 is fixedly connected to the outer wall of the three-way valve 505, and the end of the folded pipe 506 away from the three-way valve 505 is fixedly connected to the input end of the air pump 507. The air pump 507 is fixedly connected to the outer wall of the electric push rod 502. The start switch of the air pump 507 is connected to an external controller signal, and the air pump 507 can be controlled by the external controller. After the air pump 507 is started, the air inside the gripper 503 can be extracted through the folded pipe 506, the three-way valve 505, and the air pipe 504, thereby clamping the mold.

[0029] The system includes an air pipe 504, a three-way valve 505, a folded pipe 506, and an air pump 507. One end of the air pipe 504 is connected to the interior of the gripper 503, and the end of the air pipe 504 away from the gripper 503 is connected to the air pump 507 via the three-way valve 505 and the folded pipe 506. Therefore, when the air pump 507 is started, the air inside the gripper 503 can be extracted through the air pipe 504, the three-way valve 505, and the folded pipe 506, allowing the gripper 503 to clamp the mold. The folded pipe 506 allows for normal gas delivery when the gripper 503 moves. Furthermore, a pressure relief pipe is installed on the outer wall of the folded pipe 506, allowing the air pressure inside the gripper 503 to return to normal after the work is completed.

[0030] The lifting assembly 6 includes a motor 601, a threaded rod 602, a vertical rod 603, an outer ring 604, and a connector 605. The motor 601 is fixedly connected to the bottom of the housing 1. The start switch of the motor 601 is connected to an external controller signal, allowing control of the motor 601 via the external controller. The threaded rod 602 is installed inside the housing 1, with its bottom end connected to the top output end of the motor 601. The vertical rod 603 is fixedly connected to the inner wall of the housing 1. The outer ring 604 is installed on the outer wall of the threaded rod 602. The threaded rod 602 and the vertical rod 603... All parts penetrate the outer ring 604. The outer wall of the threaded rod 602 is adapted to the inner wall of the outer ring 604. After the threaded rod 602 rotates, the outer ring 604 can move under the action of the thread. The inner wall of the outer ring 604 is slidably connected to the outer wall of the vertical rod 603. The outer ring 604 can move on the outer wall of the vertical rod 603. The connecting piece 605 is rotatably connected to the outer wall of the outer ring 604. The end of the connecting piece 605 away from the outer ring 604 is rotatably connected to the bottom of the moving plate 501. When the outer ring 604 moves, the moving plate 501 can be moved through the connecting piece 605.

[0031] The system includes a motor 601, a threaded rod 602, an outer ring 604, and a connector 605. When the motor 601 is started, the threaded rod 602 rotates. Since the outer wall of the threaded rod 602 is adapted to the inner wall of the outer ring 604, and the outer wall of the vertical rod 603 is slidably connected to the inner wall of the outer ring 604, the outer ring 604 moves on the outer wall of the threaded rod 602 under the action of the thread. One end of the connector 605 is rotatably connected to the outer wall of the outer ring 604, while the end of the connector 605 away from the outer ring 604 is rotatably connected to the bottom of the moving plate 501 and slidably connected to the inner wall of the worktable 2. Therefore, when the outer ring 604 moves, it can push the connector 605 to move inside the worktable 2, thereby moving the moving plate 501 and adjusting the position of the moving plate 501.

[0032] Working principle: In use, the mold to be cut is placed on the top of the worktable 2, and the motor 601 is started. The motor 601 drives the threaded rod 602 to rotate. Since the inside of the outer ring 604 is adapted to the outer wall of the threaded rod 602, when the threaded rod 602 rotates, the outer ring 604 will move under the action of the thread and slide on the outer wall of the vertical rod 603. When the outer ring 604 moves, it will drive the moving plate 501 to move through the connecting piece 605. After moving to the appropriate position, the electric push rod 502 is started. The output end of the electric push rod 502 pushes the gripper 503 to move. After the gripper 503 moves to the appropriate position, the pressure relief pipe is closed and the air pump 507 is started. The air pump 507 extracts the air from the inside of the outer shell 5031 through the folding pipe 506, the three-way valve 505 and the air pipe 504, which reduces the air pressure inside the outer shell 5031 and generates negative pressure. The negative pressure will generate suction on the limiting plate 5033 through the frame 5034, so that the limiting plate 5033 applies pressure to the spring 5035 and drives the clamping plate 5036 to move until the outer wall of the clamping plate 5036 abuts against the outer wall of the mold, thereby completing the fixation of the mold. Then the cutting machine 4 can be started to cut the mold.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0034] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cutting device for mold production, comprising a housing (1), a workbench (2), a bending plate (3), and a cutting machine (4), wherein the workbench (2) is fixedly connected to the top of the housing (1), the bending plate (3) is fixedly connected to the top of the workbench (2), the cutting machine (4) is mounted on the outer wall of the bending plate (3), and the inner wall of the cutting machine (4) is slidably connected to the outer wall of the bending plate (3), characterized in that: A clamping assembly (5) is installed on the top of the workbench (2), and a lifting assembly (6) is installed on the outer wall of the workbench (2). The clamping assembly (5) consists of a moving unit and an air extraction unit. The moving unit is located on the top of the workbench (2), and the air extraction unit is located on the outer wall of the moving unit.

2. The cutting device for mold production according to claim 1, characterized in that: The moving unit includes a moving plate (501), an electric push rod (502), and a gripper (503). The moving plate (501) is mounted on the top of the workbench (2), the electric push rod (502) is fixedly connected to the top of the moving plate (501), and the gripper (503) is mounted above the moving plate (501).

3. The cutting device for mold production according to claim 2, characterized in that: The bottom of the movable plate (501) is slidably connected to the top of the workbench (2), and the start switch of the electric push rod (502) is connected to the signal of an external controller.

4. The cutting device for mold production according to claim 2, characterized in that: The gripper (503) is composed of a shell (5031), a movable plate (5032), a limiting plate (5033), a frame (5034), a spring (5035), and a clamping plate (5036). The shell (5031) is fixedly connected to the output end of the electric push rod (502). The movable plate (5032) is installed inside the shell (5031). The limiting plate (5033) is installed inside the shell (5031). The frame (5034) is fixedly connected to the inside of the shell (5031). The spring (5035) is fixedly connected to the inner wall of the shell (5031). The clamping plate (5036) is installed on the outer wall of the shell (5031).

5. A cutting device for mold production according to claim 4, characterized in that: One side of the movable plate (5032) penetrates the inner wall of the outer shell (5031) and extends to the outer wall of the outer shell (5031). The outer wall of the movable plate (5032) is slidably connected to the inner wall of the outer shell (5031) through which it is penetrated. The outer wall of the limiting plate (5033) is slidably connected to the inner wall of the outer shell (5031). One side of the movable plate (5032) is fixedly connected to the outer wall of the limiting plate (5033). The outer wall of the frame (5034) abuts against the outer wall of the limiting plate (5033). The side of the spring (5035) away from the inner wall of the outer shell (5031) is fixedly connected to the outer wall of the limiting plate (5033). The outer wall of the clamping plate (5036) is fixedly connected to the outer wall of the movable plate (5032).

6. The cutting device for mold production according to claim 1, characterized in that: The air extraction unit includes an air pipe (504), a three-way valve (505), a folded tube (506), and an air pump (507). The air pipe (504) is fixedly connected to the top of the gripper (503). The three-way valve (505) is installed above the electric push rod (502). The folded tube (506) is fixedly connected to the outer wall of the three-way valve (505). The air pump (507) is fixedly connected to the outer wall of the electric push rod (502).

7. A cutting device for mold production according to claim 6, characterized in that: One end of the air tube (504) is connected to the inside of the gripper (503), the outer wall of the three-way valve (505) is fixedly connected to one end of the air tube (504), the end of the folded tube (506) away from the three-way valve (505) is fixedly connected to the input end of the air pump (507), and the start switch of the air pump (507) is connected to the signal of an external controller.

8. A cutting device for mold production according to claim 1, characterized in that: The lifting assembly (6) includes a motor (601), a threaded rod (602), a vertical rod (603), an outer ring (604), and a connector (605). The motor (601) is fixedly connected to the bottom of the housing (1), the threaded rod (602) is installed inside the housing (1), the vertical rod (603) is fixedly connected to the inner wall of the housing (1), the outer ring (604) is installed on the outer wall of the threaded rod (602), and the connector (605) is rotatably connected to the outer wall of the outer ring (604).

9. A cutting device for mold production according to claim 8, characterized in that: The start switch of the motor (601) is connected to the signal of an external controller. The bottom end of the threaded rod (602) is connected to the top output end of the motor (601). The threaded rod (602) and the vertical rod (603) both pass through the outer ring (604). The outer wall of the threaded rod (602) is adapted to the inner wall of the outer ring (604). The inner wall of the outer ring (604) is slidably connected to the outer wall of the vertical rod (603). The end of the connector (605) away from the outer ring (604) is rotatably connected to the bottom of the moving plate (501).

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