A height-adjustable electric vehicle frame assembly platform

Abstract

This utility model relates to the field of vehicle frame assembly platform technology, and more particularly to a height-adjustable electric vehicle frame assembly platform, comprising a base, an assembly seat, a flat clamp, a through groove, a hydraulic rod, a connecting bracket, an arc-shaped clamp, and an adjustment component. The assembly seat is positioned above the base, and two sets of flat clamps are positioned above the assembly seat. Multiple through grooves are formed inside the flat clamps. A hydraulic rod is fixedly installed inside the flat clamp, and a connecting bracket is fixedly installed at the telescopic end of the hydraulic rod. Multiple sets of arc-shaped clamps are arranged on the inner side of the flat clamps, and the inner wall of the arc-shaped clamps is fixedly connected to the inner wall of the connecting bracket. An adjustment component is installed inside the assembly seat. In use, this height-adjustable electric vehicle frame assembly platform, through the combination of mechanical transmission and modular design, solves the problem of the single clamping type in traditional frame assembly platforms, significantly improving the assembly efficiency in the electric vehicle production process.

Description

Technical Field

[0001] This utility model relates to the field of vehicle frame assembly platform technology, and in particular to a height-adjustable electric vehicle frame assembly platform. Background Technology

[0002] With the rapid development of the electric vehicle industry, the assembly precision and quality of the frame, as the core load-bearing component of electric vehicles, directly affect the safety and service life of the entire vehicle. Currently, the electric vehicle manufacturing industry generally adopts manual assembly or simple assembly platforms for frame assembly operations.

[0003] When using a frame assembly table, traditional assembly tables typically employ a fixed clamp structure. Their clamping modules are mostly designed for a single type of frame, such as a flat square tube frame. For example, a flat frame assembly table achieves fixation by directly pressing the side walls of the frame against the flat clamps on both sides. In contrast, a curved frame assembly table relies on contour clamps to fit against the frame surface. While this design can meet basic clamping requirements, it is limited by the single type of clamp and cannot accommodate the need for rapid switching between different frame shapes. Flat clamps cannot effectively clamp curved frames, and contour clamps have insufficient contact surface with flat frames, requiring frequent clamp replacements to adapt to different frame types.

[0004] Therefore, to address the aforementioned problems of traditional frame assembly tables' limited clamping options and inability to quickly switch between them, a height-adjustable electric vehicle frame assembly table can be designed. When using the assembly table to clamp a flat frame, the flat frame is first placed in the center of the assembly stand. Then, the two flat clamps on both sides are driven to move synchronously towards the center. Simultaneously, the buffer layer on the inner wall of the flat clamps contacts the side wall of the frame, thus achieving stable clamping of the flat frame. The buffer layer disperses the clamping force, preventing damage to the frame surface. When clamping a curved frame, for curved frames, a hydraulic rod installed inside the flat clamp is activated. The telescopic end of the hydraulic rod pulls the connecting bracket towards the center. Because the inner wall of the connecting bracket is a contoured structure that matches the curved surface of the frame, and a buffer layer is also provided to enhance friction and protect the frame, multiple sets of curved clamps can be simultaneously clamped on the curved surface of the frame by the thrust control of the hydraulic rod, achieving uniform force distribution at multiple points. This device can cover common side wall shapes of electric vehicle frames, such as square tube and round tube frames, by quickly switching between flat clamps and curved clamps, avoiding the need to change clamps due to frame type and improving production efficiency. In summary, this assembly table solves the problem of single clamping type in traditional frame assembly tables by combining mechanical transmission and modular design, significantly improving the assembly efficiency in the electric vehicle production process. Utility Model Content

[0005] To overcome the problem that traditional chassis assembly tables typically use fixed clamping structures, their clamping modules are mostly designed for a single type of chassis, flat clamps cannot effectively clamp curved chassis, and contour clamps have insufficient contact surface with flat chassis, requiring frequent clamping changes to adapt to different chassis types, thus making it inconvenient to solve the problem of traditional chassis assembly tables having a single clamping type and being unable to quickly switch between them.

[0006] The technical solution of this utility model is as follows: a height-adjustable electric vehicle frame assembly platform, including a base, an assembly seat, a flat clamp, a through groove, a hydraulic rod, a connecting bracket, an arc-shaped clamp, and an adjustment component. The assembly seat is arranged above the base, and two sets of flat clamps are arranged above the assembly seat. Multiple through grooves are opened through the interior of the flat clamp. A hydraulic rod is fixedly arranged inside the flat clamp. A connecting bracket is fixedly arranged at the telescopic end of the hydraulic rod. Multiple sets of arc-shaped clamps are arranged on the inner side of the flat clamp. The inner wall of the arc-shaped clamp is fixedly connected to the inner wall of the connecting bracket. An adjustment component is arranged inside the assembly seat.

[0007] Preferably, when the frame assembly table is in use, when clamping a flat frame, the flat frame is first placed in the center of the assembly seat, and then the two flat clamps on both sides are driven to move synchronously towards the center. At the same time, the buffer layer on the inner wall of the flat clamp contacts the side wall of the frame, thereby achieving stable clamping of the flat frame. The buffer layer can disperse the clamping force and prevent damage to the frame surface. When clamping a curved frame, for the curved frame, the hydraulic rod installed in the flat clamp is activated. The extension end of the hydraulic rod pulls the connecting bracket to move towards the center. Since the inner side of the connecting bracket is fixed to the curved clamp, its inner wall is aligned with the curved surface of the frame. The matching contour structure also features a buffer layer to enhance friction and protect the frame. Therefore, through the thrust control of the hydraulic rod, multiple sets of curved clamps simultaneously clamp the curved surface of the frame, achieving uniform force distribution at multiple points. This device can cover common side wall shapes of electric vehicle frames, such as square and round tube frames, by quickly switching between flat and curved clamps, avoiding the need to change clamps due to frame type and improving production efficiency. In summary, this assembly table, through the combination of mechanical transmission and modular design, solves the problem of the single clamping type of traditional frame assembly tables, significantly improving the assembly efficiency in the electric vehicle production process.

[0008] Preferably, the adjustment assembly includes a guide groove, a two-way lead screw, a handwheel, and a guide block. The assembly base has two sets of guide grooves that are opened through it. A two-way lead screw is rotatably installed inside one of the guide grooves. A handwheel is fixedly installed at one end of the two-way lead screw. Two sets of guide blocks are installed on the side wall of the two-way lead screw. The two sets of guide blocks are threadedly connected to both sides of the two-way lead screw. The bottom side of the flat clamp is fixedly connected to the upper end of the guide block.

[0009] Preferably, the adjustment assembly also includes a sliding rod and a sliding block. The sliding rod is fixedly installed inside another set of guide grooves. Two sets of sliding blocks are installed on the side wall of the sliding rod. The two sets of sliding blocks are slidably connected to both sides of the sliding rod, and the bottom of the flat clamp is fixedly connected to the upper end of the sliding block.

[0010] Preferably, the connecting bracket has two sets of guide holes through it, and the outer wall of the flat clamp is fixed with two sets of guide rods. The guide rods are located inside the connecting bracket, and the connecting bracket is slidably connected to the guide rods through the guide holes.

[0011] Preferably, the base has an inner cavity, and a fixed seat is fixedly installed inside the inner cavity. An adjusting motor is fixedly installed on the side wall of the fixed seat. An adjusting shaft is installed at the output end of the adjusting motor. An adjusting gear is fixedly installed on the side wall of the adjusting shaft. An adjusting tooth plate is installed on one side of the adjusting gear, and the adjusting gear meshes with the adjusting tooth plate.

[0012] Preferably, a fixed cylinder is fixedly installed inside the inner cavity, and an adjusting column is slidably installed inside the fixed cylinder. The upper end of the adjusting tooth plate is fixedly connected to the upper end of the adjusting column, and the upper end of the adjusting column is fixedly connected to the center of the bottom of the assembly base.

[0013] Preferably, multiple sets of support cylinders are fixedly arranged inside the inner cavity, and support columns are slidably arranged inside the support cylinders. The upper end of the support column is fixedly connected to the bottom of the assembly base.

[0014] The beneficial effects of this utility model are:

[0015] When using the frame assembly table, when clamping a flat frame, first place the flat frame in the center of the assembly seat, then drive the two flat clamps on both sides to move synchronously towards the center. Simultaneously, the buffer layer on the inner wall of the flat clamp contacts the side wall of the frame, thus achieving stable clamping of the flat frame. The buffer layer disperses the clamping force and prevents damage to the frame surface. When clamping a curved frame, for curved frames, activate the hydraulic rod inside the flat clamp. The telescopic end of the hydraulic rod pulls the connecting bracket towards the center. Since the inner side of the connecting bracket is fixed to the curved clamp, its inner wall matches the curved surface of the frame. The contour-following structure also features a buffer layer to enhance friction and protect the frame. Therefore, through hydraulic rod thrust control, multiple sets of curved clamps simultaneously clamp the curved surface of the frame, achieving uniform force distribution at multiple points. This device, by quickly switching between flat and curved clamps, can cover common sidewall shapes of electric vehicle frames, such as square and round tube frames, avoiding the need to change clamps due to frame type and improving production efficiency. In summary, this assembly table, through the combination of mechanical transmission and modular design, solves the problem of limited clamping types in traditional frame assembly tables, significantly improving assembly efficiency in the electric vehicle production process. Attached Figure Description

[0016] Figure 1 The diagram shown is a first three-dimensional structural schematic of a height-adjustable electric vehicle frame assembly platform according to this utility model.

[0017] Figure 2 The diagram shows a three-dimensional view of the outer structure of the assembly base of a height-adjustable electric vehicle frame assembly platform according to this utility model.

[0018] Figure 3 The diagram shown is a three-dimensional structural diagram of the planar clamp of a height-adjustable electric vehicle frame assembly platform according to this utility model.

[0019] Figure 4 The diagram shows a three-dimensional view of the outer structure of the connecting bracket of a height-adjustable electric vehicle frame assembly platform according to this utility model.

[0020] Figure 5 The diagram shows a three-dimensional view of the outer periphery of the arc-shaped clamp of a height-adjustable electric vehicle frame assembly platform according to this utility model.

[0021] Figure 6 The diagram shows a three-dimensional view of the outer structure of the adjusting tooth plate of a height-adjustable electric vehicle frame assembly platform according to this utility model.

[0022] Explanation of reference numerals in the attached drawings: 1. Base; 2. Assembly base; 3. Flat clamp; 4. Through groove; 5. Hydraulic rod; 6. Connecting bracket; 7. Arc-shaped clamp; 8. Guide groove; 9. Two-way lead screw; 10. Handwheel; 11. Guide block; 12. Sliding rod; 13. Sliding block; 14. Guide hole; 15. Guide rod; 16. Inner cavity; 17. Fixed base; 18. Adjusting motor; 19. Adjusting shaft; 20. Adjusting gear; 21. Adjusting gear plate; 22. Fixed cylinder; 23. Adjusting column; 24. Support cylinder; 25. Support column. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Please see Figure 1 and Figure 5 This utility model provides an embodiment: a height-adjustable electric vehicle frame assembly platform, including a base 1, an assembly seat 2, a flat clamp 3, a through groove 4, a hydraulic rod 5, a connecting bracket 6, an arc-shaped clamp 7, and an adjustment component. The assembly seat 2 is arranged above the base 1, and two sets of flat clamps 3 are arranged above the assembly seat 2. Multiple sets of through grooves 4 are opened through the interior of the flat clamp 3. The hydraulic rod 5 is fixedly arranged inside the flat clamp 3, and the connecting bracket 6 is fixedly arranged at the telescopic end of the hydraulic rod 5. Multiple sets of arc-shaped clamps 7 are arranged on the inner side of the flat clamp 3, and the inner wall of the arc-shaped clamp 7 is fixedly connected to the inner wall of the connecting bracket 6. The adjustment component is arranged inside the assembly seat 2.

[0025] Please see Figure 3 and Figure 4 The adjustment assembly includes a guide groove 8, a double-acting lead screw 9, a handwheel 10, and guide blocks 11. Two sets of guide grooves 8 are provided through the interior of the assembly base 2. A double-acting lead screw 9 is rotatably mounted inside one set of guide grooves 8. A handwheel 10 is fixedly mounted at one end of the double-acting lead screw 9. Two sets of guide blocks 11 are mounted on the side wall of the double-acting lead screw 9, and the two sets of guide blocks 11 are threadedly connected to both sides of the double-acting lead screw 9. One bottom side of the flat clamp 3 is fixedly connected to the upper end of the guide blocks 11. Operating the handwheel 10 drives the double-acting lead screw 9 to rotate. Since the threads on both sides of the double-acting lead screw 9 are in opposite directions, the two sets of guide blocks 11 threadedly connected to it move synchronously towards the center along the guide groove 8. The adjustment assembly also includes a sliding rod 12 and sliding blocks 13. A sliding rod 12 is fixedly mounted inside the other set of guide grooves 8. Two sets of sliding blocks 13 are mounted on the side wall of the sliding rod 12, and the two sets of sliding blocks 13 are threadedly connected to both sides of the double-acting lead screw 9. The bottom side of the flat clamp 3 is fixedly connected to the upper end of the guide blocks 11. Operating the handwheel 10 drives the double-acting lead screw 9 to rotate. Since the threads on both sides of the double-acting lead screw 9 are in opposite directions, the two sets of guide blocks 11 threadedly connected to it move synchronously towards the center along the guide groove 8. The adjustment assembly also includes a sliding rod 12 and sliding blocks 13. A sliding rod 12 is fixedly mounted inside the other set of guide grooves 8. Two sets of sliding blocks 13 are mounted on the side wall of the sliding rod 12, and the two sets of sliding blocks 13 are The sliding rod 12 is slidably connected on both sides, and the bottom of the flat clamp 3 is fixedly connected to the upper end of the sliding block 13. At the same time, the bottom of the flat clamp 3 slides along the sliding rod 12 fixed in another guide groove 8 through the sliding block 13, forming a double guide structure. The buffer layer set on the inner wall of the flat clamp 3 contacts the side wall of the frame. Stable clamping is achieved through the thread self-locking characteristic of the double screw 9. The buffer layer can disperse the clamping force to avoid damage to the surface of the frame. Two sets of guide holes 14 are opened through the interior of the connecting bracket 6. Two sets of guide rods 15 are fixedly set on the outer wall of the flat clamp 3. The guide rods 15 are set inside the connecting bracket 6. The connecting bracket 6 is slidably connected to the guide rods 15 through the guide holes 14. When the connecting bracket 6 moves, the guide holes 14 opened on both sides slide and cooperate with the guide rods 15 fixed on the outer wall of the flat clamp 3 to ensure that the arc clamp 7 moves smoothly along a straight line and avoids deflection.

[0026] Please see Figure 2 and Figure 6The base 1 has an inner cavity 16, inside which a fixed seat 17 is fixedly installed. An adjusting motor 18 is fixedly installed on the side wall of the fixed seat 17. An adjusting shaft 19 is installed at the output end of the adjusting motor 18. An adjusting gear 20 is fixedly installed on the side wall of the adjusting shaft 19. An adjusting tooth plate 21 is installed on one side of the adjusting gear 20. The adjusting gear 20 meshes with the adjusting tooth plate 21. When the adjusting motor 18 is started, the output end of the adjusting motor 18 drives the adjusting gear 20 fixed on its side wall to rotate through the adjusting shaft 19. Since the adjusting gear 20 meshes with the adjusting tooth plate 21, the rotational motion of the adjusting gear 20 is converted into the linear lifting motion of the adjusting tooth plate 21. A fixed cylinder 22 is fixedly installed inside the inner cavity 16. An adjusting column 23 is slidably installed inside the fixed cylinder 22. The upper end of the adjusting tooth plate 21 and the upper end of the adjusting column 23 are connected. The upper end of the adjusting column 23 is fixedly connected to the center of the bottom of the assembly base 2. Since the upper end of the adjusting tooth plate 21 is fixedly connected to the adjusting column 23, the adjusting column 23 slides vertically in the fixed cylinder 22. Through the transmission accuracy of the gear tooth plate and the guiding effect of the support structure, the assembly base 2 achieves stable and precise vertical lifting. Finally, the assembly base 2 reaches the target height by adjusting the forward and reverse rotation of the motor 18, which meets the height requirements of operators of different heights or different assembly processes. Multiple sets of support cylinders 24 are fixedly installed inside the inner cavity 16. Support columns 25 are slidably installed inside the support cylinders 24. The upper end of the support column 25 is fixedly connected to the bottom of the assembly base 2. At the same time, the multiple sets of support cylinders 24 in the inner cavity 16 of the base 1 cooperate with the support columns 25. The upper end of the support column 25 is fixed to the bottom of the assembly base 2, and the lower end slides synchronously in the support cylinder 24.

[0027] When the chassis assembly platform is in use, and the height of the assembly seat 2 needs to be adjusted to meet operational requirements, firstly, the adjustment motor 18 is started. The output end of the adjustment motor 18 drives the adjustment gear 20, which is fixed to its side wall, to rotate via the adjustment shaft 19. Since the adjustment gear 20 meshes with the adjustment toothed plate 21, the rotational motion of the adjustment gear 20 is converted into the linear lifting motion of the adjustment toothed plate 21. Because the upper end of the adjustment toothed plate 21 is fixedly connected to the adjustment column 23, the adjustment column 23 slides vertically within the fixed cylinder 22. At the same time, multiple sets of support cylinders 24 provided in the inner cavity 16 of the base 1 cooperate with the support column 25. The upper end of the support column 25 is fixed to the bottom of the assembly seat 2, and the lower end slides synchronously within the support cylinder 24. Through the transmission accuracy of the gear and toothed plate and the guiding effect of the support structure, the assembly seat 2 achieves smooth and precise vertical lifting. Finally, the adjustment motor 18 controls the assembly seat 2 to reach the target height by reversing forward and reverse, meeting the height requirements of operators of different heights or different assembly processes.

[0028] When clamping the flat frame, first place the flat frame in the center of the assembly base 2, then operate the handwheel 10 to drive the double-acting screw 9 to rotate. Since the threads on both sides of the double-acting screw 9 are in opposite directions, the two sets of guide blocks 11 connected to it move synchronously towards the center along the guide groove 8. At the same time, the other side of the bottom of the flat clamp 3, which is fixedly connected to the guide block 11, slides along the sliding rod 12 fixed in another guide groove 8 through the sliding block 13, forming a double-guide structure. The buffer layer set on the inner wall of the flat clamp 3 contacts the side wall of the frame. Stable clamping is achieved through the thread self-locking characteristic of the double-acting screw 9. The buffer layer can disperse the clamping force to avoid damage to the surface of the frame.

[0029] When clamping the curved frame, for the curved frame, the hydraulic rod 5 installed inside the flat clamp 3 is activated. The telescopic end of the hydraulic rod 5 pulls the connecting bracket 6 towards the center. Since the curved clamp 7 is fixed inside the connecting bracket 6, its inner wall is a contoured structure that matches the curved surface of the frame. A buffer layer is also provided to enhance friction and protect the frame. When the connecting bracket 6 moves, the guide holes 14 on both sides slide and engage with the guide rod 15 fixed to the outer wall of the flat clamp 3, ensuring that the curved clamp 7 moves smoothly along a straight line and avoids deflection. Therefore, through the thrust control of the hydraulic rod 5, multiple sets of curved clamps 7 simultaneously clamp the curved surface of the frame, achieving uniform force distribution at multiple points.

[0030] This device can quickly switch between flat clamp 3 and curved clamp 7 to cover common side wall shapes of electric vehicle frames, such as square tube and round tube frames, avoiding the need to change clamps due to frame type and improving production efficiency. In summary, this assembly table solves the problem of single clamping type in traditional frame assembly tables by combining mechanical transmission and modular design, and significantly improves the assembly efficiency in the electric vehicle production process.

[0031] Through the above steps, when the frame assembly platform is in use, when clamping a flat frame, first place the flat frame in the center of the assembly seat 2, then drive the two flat clamps 3 to move synchronously towards the center. At the same time, the buffer layer set on the inner wall of the flat clamp 3 contacts the side wall of the frame, thereby achieving stable clamping of the flat frame. The buffer layer can disperse the clamping force and avoid damage to the frame surface. When clamping a curved frame, for the curved frame, activate the hydraulic rod 5 set in the flat clamp 3. The telescopic end of the hydraulic rod 5 pulls the connecting bracket 6 to move towards the center. Since the inner side of the connecting bracket 6 is fixed to the curved clamp 7, its inner wall is in contact with the frame. The frame features a contoured structure that matches the curved surface, and a buffer layer is also provided to enhance friction and protect the frame. Therefore, through the thrust control of the hydraulic rod 5, multiple sets of curved clamps 7 simultaneously clamp the curved surface of the frame, achieving uniform force distribution at multiple points. This device can cover common side wall shapes of electric vehicle frames, such as square tube and round tube frames, by quickly switching between flat clamps 3 and curved clamps 7, avoiding the need to change clamps due to frame type and improving production efficiency. In summary, this assembly table, through the combination of mechanical transmission and modular design, solves the problem of the single clamping type of traditional frame assembly tables, significantly improving the assembly efficiency in the electric vehicle production process.

[0032] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A height-adjustable electric vehicle frame assembly platform, comprising a base (1), characterized in that: It also includes an assembly base (2), a flat clamp (3), a through groove (4), a hydraulic rod (5), a connecting bracket (6), an arc-shaped clamp (7), and an adjustment component. An assembly base (2) is provided above the base (1). Two sets of flat clamps (3) are provided above the assembly base (2). Multiple sets of through grooves (4) are opened through the interior of the flat clamp (3). A hydraulic rod (5) is fixedly provided inside the flat clamp (3). A connecting bracket (6) is fixedly provided at the telescopic end of the hydraulic rod (5). Multiple sets of arc-shaped clamps (7) are provided on the inner side of the flat clamp (3). The inner wall of the arc-shaped clamp (7) is fixedly connected to the inner wall of the connecting bracket (6). An adjustment component is provided inside the assembly base (2).

2. The height-adjustable electric vehicle frame assembly platform according to claim 1, characterized in that: The adjustment assembly includes a guide groove (8), a two-way lead screw (9), a handwheel (10), and a guide block (11). The assembly base (2) has two sets of guide grooves (8) that pass through it. A two-way lead screw (9) is rotatably installed inside one of the guide grooves (8). A handwheel (10) is fixedly installed at one end of the two-way lead screw (9). Two sets of guide blocks (11) are installed on the side wall of the two-way lead screw (9). The two sets of guide blocks (11) are threaded to both sides of the two-way lead screw (9). The bottom side of the flat clamp (3) is fixedly connected to the upper end of the guide block (11).

3. The height-adjustable electric vehicle frame assembly platform according to claim 2, characterized in that: The adjustment assembly also includes a sliding rod (12) and a sliding block (13). The sliding rod (12) is fixedly installed inside another set of guide grooves (8). Two sets of sliding blocks (13) are installed on the side wall of the sliding rod (12). The two sets of sliding blocks (13) are slidably connected to the two sides of the sliding rod (12) respectively. The bottom of the flat clamp (3) is fixedly connected to the upper end of the sliding block (13).

4. The height-adjustable electric vehicle frame assembly platform according to claim 1, characterized in that: The connecting bracket (6) has two sets of guide holes (14) through it. The outer wall of the flat clamp (3) is fixed with two sets of guide rods (15). The guide rods (15) are located inside the connecting bracket (6). The connecting bracket (6) is slidably connected to the guide rods (15) through the guide holes (14).

5. The height-adjustable electric vehicle frame assembly platform according to claim 1, characterized in that: The base (1) has an inner cavity (16) inside, and a fixed seat (17) is fixedly installed inside the inner cavity (16). An adjusting motor (18) is fixedly installed on the side wall of the fixed seat (17). An adjusting shaft (19) is installed at the output end of the adjusting motor (18). An adjusting gear (20) is fixedly installed on the side wall of the adjusting shaft (19). An adjusting tooth plate (21) is installed on one side of the adjusting gear (20). The adjusting gear (20) meshes with the adjusting tooth plate (21).

6. The height-adjustable electric vehicle frame assembly platform according to claim 5, characterized in that: A fixed cylinder (22) is fixedly installed inside the inner cavity (16), and an adjusting column (23) is slidably installed inside the fixed cylinder (22). The upper end of the adjusting tooth plate (21) is fixedly connected to the upper end of the adjusting column (23), and the upper end of the adjusting column (23) is fixedly connected to the center of the bottom of the assembly base (2).

7. The height-adjustable electric vehicle frame assembly platform according to claim 5, characterized in that: Multiple sets of support cylinders (24) are fixedly installed inside the inner cavity (16), and support columns (25) are slidably installed inside the support cylinders (24). The upper end of the support column (25) is fixedly connected to the bottom of the assembly base (2).

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