Bearing mounting device on driven shaft

Abstract

The utility model relates to the technical field of driven shaft bearing installation, in particular to a bearing installation device on a driven shaft, which comprises a bottom plate, an adjusting assembly installed on the bottom plate and used for assisting in clamping the driven shaft, a clamping assembly installed on the adjusting assembly and used for clamping the driven shaft, and an installation assembly installed on the bottom plate and used for installing a bearing on the driven shaft. When driven shafts of different specifications need to be fixed, a first motor is firstly started, the first motor is started to drive the clamping assemblies to move, after the distance between the clamping assemblies is adjusted, the driven shafts are placed between the clamping rings by workers, then electric telescopic rods are started, the electric telescopic rods are started to drive the clamping rings to move, and the driven shafts are fixed; by means of the design, driven shafts of different lengths can be fixed, driven shafts of different thicknesses can also be fixed, and the applicability of the bearing installation device on the driven shaft is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of driven shaft bearing installation, in particular to a bearing installation device on a driven shaft. Background Art

[0002] As we all know, in mechanical transmission systems, in order to reduce friction, bearings are usually installed at both ends of the drive shaft to reduce the friction generated when the drive shaft rotates and increase the service life of the driven shaft.

[0003] After searching, the utility model patent with Chinese patent publication number CN205078624U discloses a bearing mounting plate structure on a driven shaft, which includes a mounting plate installed on a frame, a driven shaft installed between the lower ends of the two mounting plates, a driven wheel installed in the middle of the driven shaft, and bearings installed at both ends of the driven shaft. The inner side surface of the lower end of the mounting plate is provided with an inwardly protruding sleeve, the sleeve is placed on the outer peripheral surface of the driven shaft, and the bearing is installed on the outer peripheral surface of the sleeve. In the utility model, the inner side of the lower end of the mounting plate is integrally processed into a sleeve. After the bearing and the driven shaft are installed, the vibration of the driven wheel at work has little effect on the loosening of the bearing, thereby avoiding the maintenance of the bearing in a short time and reducing the maintenance cost.

[0004] Although the above technical solution solves the problem of avoiding bearing maintenance in a short period of time and reducing maintenance costs, in the above technical solution, a mounting plate is used to fix the driven shaft, and then the bearing is fixed on the driven shaft with a sleeve. However, the sizes of the mounting plate and the sleeve are fixed. When fixing driven shafts and bearings of different specifications, workers are required to replace the matching mounting plates and sleeves, which not only wastes time but also increases production costs to a certain extent. Therefore, a bearing mounting device on the driven shaft is needed. Utility Model Content

[0005] The utility model aims at solving the technical problems existing in the prior art and provides a bearing installation device on a driven shaft.

[0006] The utility model solves the above technical problems with the following technical solutions: A bearing mounting device on a driven shaft includes a base plate and further includes:

[0007] Support columns, each of the support columns is fixedly connected to the bottom of the base plate around the periphery;

[0008] an adjusting assembly, the adjusting assembly being mounted on the base plate and being used for assisting in clamping the driven shaft;

[0009] a clamping assembly, the clamping assembly being mounted on the adjusting assembly and being used for clamping the driven shaft;

[0010] A mounting assembly is mounted on the base plate and is used for mounting the bearing on the driven shaft.

[0011] Preferably, the adjustment component includes:

[0012] a first chute, the first chute being provided on the bottom plate;

[0013] First sliders, each of which is slidably connected to the inner wall of the sliding groove;

[0014] First limiting plates, each of which is fixedly connected to the top and bottom of the corresponding first chute;

[0015] Support blocks, each of the support blocks is fixedly connected to the top of the corresponding first sliding block;

[0016] A driving assembly is installed on the top of the base plate and is used to drive the first sliding block to slide.

[0017] Furthermore, the clamping assembly includes:

[0018] a mounting plate fixedly connected to the top of the first sliding block;

[0019] A support plate, the support plate being fixedly connected to the top of the mounting plate;

[0020] an electric telescopic rod, the electric telescopic rod being mounted on the mounting plate;

[0021] A moving rod, the moving rod being fixedly connected to the top of the electric telescopic rod;

[0022] First rotating rods, each of which is rotatably connected to both ends of the support plate, and each of which is rotatably connected to both ends of the moving rod via an axis;

[0023] Clamping rings, each of the clamping rings is rotatably connected to the corresponding first rotating rod.

[0024] Furthermore, the installation component includes:

[0025] second chutes, each of the second chutes being respectively provided on both sides of the bottom plate;

[0026] Second sliders, each second slider being slidably connected to an inner wall of a corresponding second chute;

[0027] A fixing rod, each of the fixing rods is fixedly connected to the top of the corresponding second sliding block;

[0028] first connecting rods, each of the first connecting rods being fixedly connected between the tops of the corresponding fixing rods;

[0029] Second connecting rods, each of the second connecting rods is fixedly connected between the bottoms of the corresponding fixing rods;

[0030] Mounting slots, each of the mounting slots is respectively provided on the corresponding first connecting rod;

[0031] The fixing components are respectively installed on the inner wall of the corresponding installation groove.

[0032] In a further embodiment, the drive assembly includes:

[0033] Mounting blocks, each of the mounting blocks is fixedly connected to both sides of the bottom of the base plate;

[0034] a bidirectional screw rod, the bidirectional screw rod being rotatably connected between the mounting blocks and being connected to the first sliding blocks via threads;

[0035] a first bevel gear, the first bevel gear being fixedly connected to one end of the bidirectional lead screw;

[0036] a first motor, the first motor being mounted on the base plate;

[0037] The second bevel gear is fixedly connected to the output shaft of the motor, and the first bevel gear is meshed with the second bevel gear.

[0038] On the basis of the above solution, the fixing assembly includes:

[0039] a disc fixedly connected to the inner wall of the mounting groove;

[0040] third chutes, each of the third chutes being respectively arranged on the four sides of the disc;

[0041] Clamping blocks, each of the clamping blocks is slidably connected to the inner wall of the corresponding third chute;

[0042] Vertical plates, each of the vertical plates is fixedly connected to a side surface of the corresponding clamping block;

[0043] Sliding columns, each of the sliding columns is slidably connected to the corresponding vertical plate;

[0044] fixing nuts, each of which is connected to the corresponding sliding column through a thread, and each of which contacts two sides of the vertical plate;

[0045] Connecting blocks, each of the connecting blocks is fixedly connected to one end of the corresponding sliding column;

[0046] Second rotating rods, each of the second rotating rods is rotatably connected to the inner wall of the corresponding connecting block;

[0047] a second motor, the second motor being mounted on the disc and in contact with an inner wall of the mounting groove;

[0048] a rotating disk fixedly connected to the output shaft of the second motor;

[0049] The third rotating rods are fixedly connected to the four sides of the rotating disk, and are rotatably connected to the corresponding second rotating rods through an axis.

[0050] Beneficial effects:

[0051] 1. The bearing mounting device on the driven shaft, when it is necessary to fix driven shafts of different specifications, first start the first motor, the first motor starts to drive the second bevel gear to rotate, the second bevel gear rotates to drive the first bevel gear to rotate, the first bevel gear rotates to drive the bidirectional screw to rotate, the bidirectional screw rotates to drive the first slider to move, the first slider moves to drive the clamping assembly to move, after adjusting the distance between the clamping assemblies, the worker then places the driven shaft between the clamping rings, and then starts the electric telescopic rod, the electric telescopic rod starts to drive the moving rod to move, the moving rod moves to drive the first rotating rod to rotate, the first rotating rod rotates to drive the clamping ring to move, and the driven shaft is fixed. This design can not only fix driven shafts of different lengths, but also fix driven shafts of different thicknesses, thereby increasing the applicability of the bearing mounting device on the driven shaft.

[0052] 2. When it is necessary to fix bearings of different specifications, first place the bearings between the clamping blocks, and then the worker starts the second motor. The second motor starts to drive the rotating disk to rotate, the rotation of the rotating disk drives the third rotating rod to rotate, the rotation of the third rotating rod drives the second rotating rod to rotate, the rotation of the second rotating rod drives the connecting block to move, the movement of the connecting block drives the sliding column to slide, the sliding column drives the clamping block to move, and the bearing is fixed. This design can achieve the fixation of bearings of different sizes and specifications, further increasing the applicability of the bearing mounting device on the driven shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is a side structural diagram of the present utility model;

[0054] Figure 2 This is a schematic structural diagram of the clamping assembly of the present utility model;

[0055] Figure 3 This is a schematic diagram of the structure of the fixing assembly of the utility model;

[0056] Figure 4 It is a structural schematic diagram of the rotating disk of the utility model.

[0057] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0058] 1. Base plate; 2. Support column; 3. First slider; 4. First limit plate; 5. Support block; 6. Mounting plate; 7. Support plate; 8. Electric telescopic rod; 9. Moving rod; 10. First rotating rod; 11. Clamping ring; 12. Second slider; 13. Fixed rod; 14. First connecting rod; 15. Second connecting rod; 16. Mounting block; 17. Bidirectional screw; 18. First bevel gear; 19. First motor; 20. Second bevel gear; 21. Disc; 22. Clamping block; 23. Vertical plate; 24. Sliding column; 25. Fixed nut; 26. Connecting block; 27. Second rotating rod; 28. Second motor; 29. ​​Rotating disk; 30. Third rotating rod. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0060] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the specified features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically specified.

[0061] In the description of the present invention, the term "for example" is used to mean "used as an example, illustration or explanation". Any embodiment described as "for example" in the present invention is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any person skilled in the art to implement and use the present invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed herein.

[0062] See Figures 1 to 4, a bearing mounting device on a driven shaft includes a base plate 1, each support column 2 is fixedly connected to the bottom of the base plate 1 around the periphery, an adjusting assembly is mounted on the base plate 1 for assisting in clamping the driven shaft, a first slide groove in the adjusting assembly is opened on the base plate 1, each first slider 3 is slidably connected to the inner wall of the slide groove, each first limit plate 4 is fixedly connected to the top and bottom of the corresponding first slide groove, each support block 5 is fixedly connected to the top of the corresponding first slider 3, a driving assembly is mounted on the top of the base plate 1 for driving the first slider 3 to slide, a clamping assembly is mounted on the adjusting assembly for clamping the driven shaft, a mounting plate 6 in the clamping assembly is fixedly connected to the top of the first slider 3, a support plate 7 is fixedly connected to the top of the mounting plate 6, an electric telescopic rod 8 is mounted on the mounting plate 6, and a moving rod 9 is fixedly connected to the top of the electric telescopic rod 8. Each first rotating rod 10 is rotatably connected to the two ends of the support plate 7, and each first rotating rod 10 is rotatably connected to the two ends of the moving rod 9 through an axis. Each clamping ring 11 is rotatably connected to the corresponding first rotating rod 10. The mounting assembly is mounted on the base plate 1 for mounting the bearing on the driven shaft. The second slide grooves in the mounting assembly are respectively opened on both sides of the base plate 1, and the second sliders 12 are respectively slidably connected to the inner walls of the corresponding second slide grooves. The fixed rods 13 are respectively fixedly connected to the tops of the corresponding second sliders 12. The first connecting rods 14 are respectively fixedly connected between the tops of the corresponding fixed rods 13, and the second connecting rods 15 are respectively fixedly connected between the bottoms of the corresponding fixed rods 13. The mounting grooves are respectively opened on the corresponding first connecting rods 14, and the fixed components are respectively mounted on the inner walls of the corresponding mounting grooves.

[0063] The base plate 1 serves as the basis of the bearing mounting device on the entire driven shaft. The support columns 2 are fixedly connected to the bottom of the base plate 1 around the four sides to provide additional stability and supporting force. The first slider 3 is slidably connected to the inner wall of the first slide groove and can move along the slide groove as needed. The first limit plates 4 are fixedly connected to the top and bottom of the first slide groove to limit the moving range of the first slider 3 and prevent the first slider 3 from sliding out of the slide groove. The support block 5 is fixedly connected to the top of the first slider 3. The support block 5 serves as the installation base of the clamping assembly. The mounting plate 6 is fixedly connected to the top of the first slider 3 and moves with the first slider 3. The support plate 7 is fixedly connected to the top of the mounting plate 6 to provide support for the electric telescopic rod 8 and the first rotating rod 10. The electric telescopic rod 8 is installed on the mounting plate 6 and drives the moving rod 9 to move up and down through telescopic movement. The moving rod 9 is fixedly connected to the electric telescopic rod 8. The top of the retraction rod 8 moves with the extension and retraction of the electric telescopic rod 8. The first rotating rod 10 is rotatably connected to the two ends of the support plate 7 and is rotatably connected to the two ends of the moving rod 9 through an axis. When the moving rod 9 moves up and down, it will drive the first rotating rod 10 to rotate around the two ends of the support plate 7. The clamping ring 11 is rotatably connected to the corresponding first rotating rod 10 and moves with the rotation of the first rotating rod 10, thereby achieving the clamping or loosening of the driven shaft. The second slider 12 is slidably connected to the inner wall of the second slide groove, and the fixed rod 13 is fixedly connected to the top of the second slider 12, serving as the installation basis for the first connecting rod 14 and the second connecting rod 15. The first connecting rod 14 is fixedly connected between the tops of the corresponding fixed rods 13 to form a crossbeam across the base plate 1, and the second connecting rod 15 is fixedly connected between the bottoms of the corresponding fixed rods 13 to enhance the stability of the entire installation assembly.

[0064] First, see Figure 1 In this embodiment, the mounting blocks 16 in the drive assembly are respectively fixedly connected to both sides of the bottom of the base plate 1, the bidirectional screw rod 17 is rotatably connected between the mounting blocks 16, and the bidirectional screw rod 17 is connected to each first slider 3 through a threaded connection, the first bevel gear 18 is fixedly connected to one end of the bidirectional screw rod 17, the first motor 19 is installed on the base plate 1, the second bevel gear 20 is fixedly connected to the output shaft of the motor, and the first bevel gear 18 is meshed with the second bevel gear 20.

[0065] The mounting blocks 16 are fixedly connected to both sides of the bottom of the base plate 1, serving as the installation basis for the bidirectional screw rod 17. The bidirectional screw rod 17 is rotatably connected between the mounting blocks 16. When the bidirectional screw rod 17 rotates, the first slider 3 connected thereto will move toward or away from each other according to the direction of the thread. The first slider 3 is connected to the bidirectional screw rod 17 by a threaded connection, so when the bidirectional screw rod 17 rotates, the first slider 3 will move along the slide groove. The first bevel gear 18 is fixedly connected to one end of the bidirectional screw rod 17. As part of the power transmission, the first motor 19 is installed on the base plate 1 to provide power for the entire drive assembly. The second bevel gear 20 is fixedly connected to the output shaft of the motor and meshes with the first bevel gear 18. When the first motor 19 rotates, the first motor 19 will drive the first bevel gear 18 and the bidirectional screw rod 17 to rotate through the second bevel gear 20.

[0066] Finally, see Figure 4 In this embodiment, the disc 21 in the fixing assembly is fixedly connected to the inner wall of the mounting groove, each third slide groove is respectively opened around the disc 21, each clamping block 22 is slidably connected to the inner wall of the corresponding third slide groove, each vertical plate 23 is respectively fixedly connected to the side of the corresponding clamping block 22, each sliding column 24 is slidably connected to the corresponding vertical plate 23, each fixing nut 25 is connected to the corresponding sliding column 24 by a thread, and each fixing nut 25 is respectively in contact with both sides of the vertical plate 23, each connecting block 26 is respectively fixedly connected to one end of the corresponding sliding column 24, each second rotating rod 27 is rotatably connected to the inner wall of the corresponding connecting block 26, the second motor 28 is mounted on the disc 21, and the second motor 28 is in contact with the inner wall of the mounting groove, the rotating disc 29 is fixedly connected to the output shaft of the second motor 28, each third rotating rod 30 is respectively fixedly connected around the rotating disc 29, and each third rotating rod 30 is respectively rotatably connected to the corresponding second rotating rod 27 through an axis.

[0067] The disc 21 is fixedly connected to the inner wall of the mounting groove and serves as the mounting base for the clamping block 22 and other components. The clamping block 22 is slidably connected to the inner wall of the corresponding third slide groove and can be moved along the slide groove to adjust the position as needed. The vertical plate 23 is fixedly connected to the side of the corresponding clamping block 22 to support the sliding column 24. The sliding column 24 is slidably connected to the corresponding vertical plate 23, allowing the vertical plate 23 to move relative to the sliding column 24. The fixing nut 25 is connected to the corresponding sliding column 24 by a thread, and the fixing nut 25 contacts both sides of the vertical plate 23. By rotating the fixing nut 25, the relative position between the vertical plate 23 and the sliding column 24 can be adjusted and the position of the clamping block 22 can be fixed. The connecting block 26 is fixedly connected to one end of the corresponding sliding column 24. The connecting block 2 6 serves as the installation base of the second rotating rod 27. The second rotating rod 27 is rotatably connected to the inner wall of the corresponding connecting block 26, and is used to cooperate with the third rotating rod 30 to drive the sliding column 24 to slide. The second motor 28 is installed on the disc 21 and contacts the inner wall of the mounting groove to provide power for the fixed component. The rotating disc 29 is fixedly connected to the output shaft of the second motor 28. When the motor rotates, the rotating disc 29 will rotate accordingly. The third rotating rod 30 is fixedly connected to the four sides of the rotating disc 29 and is rotatably connected to the corresponding second rotating rod 27 through an axis. When the rotating disc 29 rotates, the third rotating rod 30 will drive the second rotating rod 27 and the components connected to the second rotating rod 27 to rotate or move together, thereby driving the sliding column 24 to slide, thereby driving the clamping block 22 to clamp the bearing.

[0068] Working principle:

[0069] The bearing mounting device on the driven shaft, when it is necessary to fix driven shafts of different specifications, first start the first motor 19, the first motor 19 starts to drive the second bevel gear 20 to rotate, the second bevel gear 20 rotates to drive the first bevel gear 18 to rotate, the first bevel gear 18 rotates to drive the bidirectional screw rod 17 to rotate, the bidirectional screw rod 17 rotates to drive the first slider 3 to move, the first slider 3 moves to drive the clamping assembly to move, after adjusting the distance between the clamping assemblies, the worker then places the driven shaft between the clamping rings 11, and then starts the electric telescopic rod 8, the electric telescopic rod 8 starts to drive the moving rod 9 to move, the moving rod 9 moves to drive the first rotating rod 10 to rotate, the first rotating rod 10 rotates to drive the clamping ring 11 to move, and fix the driven shaft.

[0070] When it is necessary to fix bearings of different specifications, the bearings are first placed between the clamping blocks 22, and then the worker starts the second motor 28. The second motor 28 starts to drive the rotating disk 29 to rotate, and the rotation of the rotating disk 29 drives the third rotating rod 30 to rotate. The rotation of the third rotating rod 30 drives the second rotating rod 27 to rotate. The rotation of the second rotating rod 27 drives the connecting block 26 to move. The movement of the connecting block 26 drives the sliding column 24 to slide. The sliding of the sliding column 24 drives the clamping block 22 to move, thereby fixing the bearing.

[0071] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0072] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A bearing mounting device on a driven shaft, comprising a base plate (1), characterized in that: Also includes: Support columns (2), each of the support columns (2) is fixedly connected to the bottom of the base plate (1) around the periphery; An adjusting assembly, the adjusting assembly being mounted on the base plate (1) and being used for assisting in clamping the driven shaft; a clamping assembly, the clamping assembly being mounted on the adjusting assembly and being used for clamping the driven shaft; A mounting assembly is mounted on the base plate (1) and is used for mounting the bearing on the driven shaft.

2. A bearing mounting device on a driven shaft according to claim 1, characterized in that: The adjustment component includes: A first chute, the first chute being provided on the bottom plate (1); First sliders (3), each of the first sliders (3) being slidably connected to the inner wall of the chute; First limiting plates (4), each of the first limiting plates (4) being fixedly connected to the top and bottom of the corresponding first chute; Support blocks (5), each of the support blocks (5) is fixedly connected to the top of the corresponding first sliding block (3); A driving assembly is installed on the top of the base plate (1) and is used to drive the first sliding block (3) to slide.

3. A bearing mounting device on a driven shaft according to claim 2, characterized in that: The clamping assembly comprises: a mounting plate (6), the mounting plate (6) being fixedly connected to the top of the first sliding block (3); A support plate (7), the support plate (7) being fixedly connected to the top of the mounting plate (6); An electric telescopic rod (8), the electric telescopic rod (8) being mounted on the mounting plate (6); A moving rod (9), the moving rod (9) being fixedly connected to the top of the electric telescopic rod (8); First rotating rods (10), each of the first rotating rods (10) is rotatably connected to both ends of the support plate (7), and each of the first rotating rods (10) is rotatably connected to both ends of the moving rod (9) via an axis; A clamping ring (11), each of the clamping rings (11) is rotatably connected to the corresponding first rotating rod (10).

4. A bearing mounting device on a driven shaft according to claim 3, characterized in that: The installation components include: Second chutes, each of the second chutes being respectively provided on both sides of the bottom plate (1); Second sliders (12), each second slider (12) being slidably connected to the inner wall of the corresponding second chute; A fixing rod (13), each fixing rod (13) being fixedly connected to the top of the corresponding second sliding block (12); First connecting rods (14), each of the first connecting rods (14) is fixedly connected between the tops of the corresponding fixing rods (13); Second connecting rods (15), each of the second connecting rods (15) is fixedly connected between the bottoms of the corresponding fixing rods (13); Mounting slots, each of the mounting slots being respectively provided on the corresponding first connecting rod (14); The fixing components are respectively installed on the inner wall of the corresponding installation groove.

5. A bearing mounting device on a driven shaft according to claim 4, characterized in that: The drive assembly includes: Mounting blocks (16), each of the mounting blocks (16) being fixedly connected to both sides of the bottom of the base plate (1); a bidirectional screw rod (17), the bidirectional screw rod (17) being rotatably connected between the mounting blocks (16), and the bidirectional screw rod (17) being connected to the first sliders (3) via threads; a first bevel gear (18), the first bevel gear (18) being fixedly connected to one end of the bidirectional screw rod (17); a first motor (19), the first motor (19) being mounted on the base plate (1); A second bevel gear (20) is fixedly connected to the output shaft of the motor, and the first bevel gear (18) is meshed with the second bevel gear (20).

6. A bearing mounting device on a driven shaft according to claim 5, characterized in that: The fixing assembly includes: a disc (21), the disc (21) being fixedly connected to the inner wall of the mounting groove; Third chutes, each of the third chutes is respectively arranged around the disc (21); Clamping blocks (22), each of the clamping blocks (22) being slidably connected to the inner wall of the corresponding third chute; Vertical plates (23), each of the vertical plates (23) is fixedly connected to a side surface of the corresponding clamping block (22); Sliding columns (24), each of the sliding columns (24) is slidably connected to the corresponding vertical plate (23); A fixing nut (25), each of the fixing nuts (25) is connected to the corresponding sliding column (24) through a thread, and each of the fixing nuts (25) is in contact with both sides of the vertical plate (23); Connecting blocks (26), each of the connecting blocks (26) is fixedly connected to one end of the corresponding sliding column (24); Second rotating rods (27), each of the second rotating rods (27) is rotatably connected to the inner wall of the corresponding connecting block (26); a second motor (28), the second motor (28) being mounted on the disc (21), and the second motor (28) being in contact with an inner wall of the mounting groove; a rotating disk (29), the rotating disk (29) being fixedly connected to the output shaft of the second motor (28); The third rotating rods (30) are fixedly connected to the four sides of the rotating disk (29), and each third rotating rod (30) is rotatably connected to the corresponding second rotating rod (27) through an axis.

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