A lead-acid battery layered grid frame

Abstract

This invention discloses a layered grid rack for lead-acid batteries, including a first side frame and a second side frame. Multiple sets of transverse screws are arranged between the first and second side frames, and multiple sets of placement racks are arranged on the transverse screws. A grid body is placed between two adjacent sets of placement racks. A base is provided at the lower end of the first and second side frames. Each placement rack includes a main frame and multiple sets of sub-frames. A through hole is provided on the first drive block. A first adjusting nut and a second adjusting nut are threaded onto the transverse screws. The first side frame includes a vertical screw, and multiple sets of third adjusting nuts are fitted onto the vertical screw. The key technical features are: the length and width of the grid rack placement positions are adjustable; the width of the placement positions adapts to the side thickness of the grid body, improving the flexibility and versatility of the grid rack; a hydraulic cylinder drives the rollers to move downwards, lifting the base and the upper frame, facilitating the movement of the grid rack without the need for a forklift.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing equipment technology, and in particular to a layered grid frame for lead-acid batteries. Background Technology

[0002] All batteries that use an acidic aqueous solution as their electrolyte are collectively called acid batteries, with lead-acid batteries being the most typical. The main advantages of acid batteries are their high operating voltage, wide operating temperature range, good high and low discharge rate performance, abundant raw material sources, and low price. In recent years, although lithium-ion batteries have been widely used in the field of new energy vehicles, lead-acid batteries remain almost irreplaceable in the starting systems of automobiles and motorcycles.

[0003] Lead-acid batteries are composed of important components such as positive plates, negative plates, separators, casing, terminals, and safety valves. The plates are the core of lead-acid batteries. The grid is what conducts electricity and serves as a framework for the plates. The grid is formed by melting lead ingots at high temperatures, letting them flow into a mold under gravity to cool and solidify. After the excess material is cut off, the grid is formed and then placed on a grid frame.

[0004] The size, thickness, and weight of the grid determine the capacity and lifespan of a lead-acid battery. Therefore, grids come in various sizes, and most existing grid racks are designed for a specific grid size, making them unsuitable for other grid sizes. This results in poor versatility and low flexibility in use.

[0005] After placing multiple sets of gratings on the grating frame, the grating frame is usually moved by forklift, which is quite inconvenient. Summary of the Invention

[0006] Technical problems to be solved:

[0007] To address the shortcomings of existing technologies, this invention provides a layered grid frame for lead-acid batteries. The length and width of the grid frame placement positions are adjustable, and the width of the placement positions adapts to the side thickness of the grid body, improving the flexibility and versatility of the grid frame. A hydraulic cylinder drives the rollers to move downwards, lifting the base and the upper frame, making it easy to move the grid frame without the need for a forklift, thus solving the technical problems mentioned in the background art.

[0008] Technical solution:

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A layered grid rack for lead-acid batteries includes a first side frame and a second side frame. Multiple sets of transverse screws are arranged between the first and second side frames. Multiple sets of placement racks are mounted on the transverse screws, and each set of placement racks can slide along the axial direction of the transverse screws. The spacing between adjacent sets of placement racks is adjustable, forming a placement position between two sets of placement racks. A grid main body is placed between two adjacent sets of placement racks. A base is provided at the lower end of the first and second side frames. Each placement rack includes a main frame and multiple sets of sub-frames, which are fixedly connected by crossbars. A through hole is provided on a first drive block. A first adjusting nut and a second adjusting nut are threaded onto the transverse screws. The first side frame includes a vertical screw, on which multiple sets of third adjusting nuts are mounted.

[0011] In one possible implementation, the main frame and the sub-frame are fixedly connected by a crossbar. A first driving block is welded and fixed to the top of the main frame. The first driving block has a through hole. The first driving block of the main frame is slidably sleeved on the transverse screw, which can adjust the sleeve position of the placement frame relative to the transverse screw.

[0012] In one possible implementation, the first adjusting nut is located outside the first drive block on the top of one main frame, and the second adjusting nut is located outside the first drive block on the top of the other main frame. Multiple placement positions are formed between two adjacent sets of placement frames. By applying a certain external force to the first adjusting nut and the second adjusting nut, the first adjusting nut and the second adjusting nut can be rotated. By controlling the direction of rotation and the number of rotations, the positions of the first adjusting nut and the second adjusting nut can be flexibly adjusted.

[0013] In one possible implementation, a second driving block is provided at both ends of the transverse screw. The second driving block at one end of the transverse screw is slidably sleeved on the vertical screw. The two sets of third adjusting nuts are located above and below the second driving block, respectively. The second driving block at one end of the transverse screw can slide along the axial direction of the vertical screw.

[0014] In one possible implementation, the second side frame includes a slide bar, and a second drive block at the other end of the transverse screw is slidably sleeved on the slide bar, and the second drive block at the other end of the transverse screw can slide along the axial direction of the slide bar.

[0015] In one possible implementation, both the main frame and the sub-frame include a square column and a support plate. One end of the support plate is slidably embedded in the square column. The square column and the support plate are fixed together by a tightening screw. Loosening the tightening screw releases the fastening force between the square column and the support plate, allowing them to slide relative to each other. Applying a certain external force to the support plate can stretch one end of the support plate out of the square column, thereby adjusting the extension length of the support plate relative to the square column.

[0016] In one possible implementation, vertical grooves are provided on both sides of the square column, and horizontal grooves are provided on both sides of the upper surface of the tray. The vertical groove on one side of the square column and the horizontal groove on one side of the tray form a set of limiting slots, and the vertical groove on the other side of the square column and the horizontal groove on the other side of the tray form a set of limiting slots. Limiting slots are provided on both sides of the main frame and the sub-frame.

[0017] In one possible implementation, a first elastic liner is provided in the vertical groove, and a second elastic liner is provided in the horizontal groove, both the first and second elastic liners having a certain degree of elasticity.

[0018] In one possible implementation, the transverse screw is fixed to the second drive block by a slot, the first side frame is fixedly connected to the base by screws, the second side frame is fixedly connected to the base by screws, the second drive block is detachably connected to the transverse screw, the first side frame is detachably connected to the base, and the second side frame is detachably connected to the base.

[0019] In one possible implementation, fixed frames are provided on both sides of the upper end of the base, and a hydraulic cylinder and a hydraulic oil tank assembly are provided at the top of the fixed frame. One end of the hydraulic cylinder is connected to a movable frame, and two sets of rollers are provided on the movable frame. The hydraulic cylinder drives the rollers to move downward, so that the four sets of rollers contact the ground and lift the base and the frame structure above the base.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The present invention features an adjustable horizontal mounting position of multiple placement racks relative to the transverse screw, an adjustable width of the placement position formed between two adjacent placement racks, and an adjustable extension length of the support plate relative to the square column. This allows the length of the limiting groove formed by the vertical and transverse grooves to be adjustable. The axial position of the transverse screw relative to the vertical screw is also adjustable, allowing the axial spacing of the placement racks in the vertical direction to be adjustable. The elastic lining of the limiting groove adapts to the side thickness of the grating body through its own elastic force. In summary, the multiple placement racks form a grating frame, which includes multiple placement positions, and both the length and width of the placement positions are adjustable. The width of the placement position adapts to the side thickness of the grating body. The overall grating frame is suitable for grating bodies of different sizes, enabling layered placement and fixing of various grating bodies, thus improving the flexibility and versatility of the grating frame.

[0022] 2. This invention uses a hydraulic cylinder to drive the rollers downward, so that the four sets of rollers contact the ground and lift the base and the frame structure above the base. This makes it easy to move the grid frame and enables rapid transfer of the grid frame without the need for a forklift. Attached Figure Description

[0023] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] Figure 1 This is a perspective view of the present invention;

[0025] Figure 2 This is the front view of the present invention;

[0026] Figure 3 This is a schematic diagram showing the placement of the main body of the plate grid of the present invention;

[0027] Figure 4 This is a front perspective view of the placement rack of the present invention;

[0028] Figure 5 This is a rear perspective view of the placement rack of the present invention;

[0029] Figure 6 for Figure 3 Enlarged view of a portion of area A in the middle;

[0030] Figure 7 for Figure 3 Enlarged view of a section in area B;

[0031] Figure 8 for Figure 3 A magnified view of a section in area C;

[0032] Figure 9 for Figure 5 Enlarged view of a section in area D;

[0033] Figure 10 This is a schematic diagram of the structure of the base of the present invention.

[0034] In the diagram: 1. First side frame; 2. Second side frame; 3. Horizontal screw; 4. Placement frame; 5. Main body of the grid; 6. Base; 7. Main frame; 8. Sub-frame; 9. First drive block; 10. Through hole; 11. First adjusting nut; 12. Second adjusting nut; 13. Vertical screw; 14. Second drive block; 15. Third adjusting nut; 16. Slide rod; 17. Square column; 18. Support plate; 19. Vertical groove; 20. Horizontal groove; 21. Tightening screw; 22. First elastic liner; 23. Second elastic liner; 24. Fixed frame; 25. Hydraulic cylinder; 26. Moving frame; 27. Roller; 28. Hydraulic oil tank assembly. Detailed Implementation

[0035] This application provides a layered grid rack for lead-acid batteries. The length and width of the grid rack placement positions are adjustable, and the width of the placement positions adapts to the side thickness of the grid body, improving the flexibility and versatility of the grid rack. The hydraulic cylinder drives the rollers to move downwards, lifting the base and the upper frame, making it easy to move the grid rack without the need for a forklift, thus solving the technical problems mentioned in the background art.

[0036] The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows:

[0037] Example 1:

[0038] Please see Figure 1-10 This invention provides a technical solution: a layered grid frame for lead-acid batteries, including a first side frame 1 and a second side frame 2. Multiple sets of transverse screws 3 are arranged between the first side frame 1 and the second side frame 2. Multiple sets of placement racks 4 are arranged on the transverse screws 3. A grid body 5 is placed between two adjacent sets of placement racks 4. A base 6 is provided at the lower end of the first side frame 1 and the second side frame 2. The placement rack 4 includes a main frame 7 and multiple sets of sub-frames 8. A through hole 10 is provided on a first drive block 9. A first adjusting nut 11 and a second adjusting nut 12 are threaded onto the transverse screws 3. The positions of the first adjusting nut 11 and the second adjusting nut 12 can be adjusted by manually rotating them. The first side frame 1 includes a vertical screw 13, on which multiple sets of third adjusting nuts 15 are fitted. The positions of the third adjusting nuts 15 can be adjusted by manually rotating them.

[0039] In some examples, the main frame 7 and the sub-frame 8 are fixedly connected by a crossbar. The main frame 7 and multiple sets of sub-frames 8 together constitute a placement frame 4. Each placement frame 4 includes multiple placement slots for placing the main body 5 of the grid. A first driving block 9 is welded and fixed to the top of the main frame 7. A through hole 10 is opened on the first driving block 9. The first driving block 9 of the main frame 7 is slidably sleeved on the transverse screw 3. The main frame 7 and the transverse screw 3 are slidably connected. That is, the placement frame 4 and the transverse screw 3 are slidably connected, which can adjust the sleeve position of the placement frame 4 relative to the transverse screw 3 and flexibly adjust the position of multiple sets of placement frames 4.

[0040] Among them, multiple sets of placement racks 4 can slide along the axial direction of the transverse screw 3. The spacing between two adjacent sets of placement racks 4 is adjustable. The spacing between two adjacent sets of placement racks 4 is adjusted according to the size of the main body 5 of the grid, and a placement position is formed between two sets of placement racks 4, such as... Figure 3As shown, the main body 5 of the grid is placed in the placement position, and the main body 5 of the grid is fixed by two sets of placement frames 4. Following the above method, the position of the placement frames 4 is adjusted in sequence, and the main body 5 of the grid is placed in the placement position. This can achieve the fixation of multiple sets of grid bodies 5. After the initial fixation is completed, the position of the first adjusting nut 11 and the second adjusting nut 12 is manually adjusted to limit the position of the outermost two side placement frames 4. This limits the multiple sets of placement frames 4 and prevents the placement frames 4 from sliding along the transverse screw 3 under the action of external force, thus ensuring the placement stability of the main body 5 of the grid.

[0041] In some examples, the first adjusting nut 11 is located outside the first driving block 9 at the top of the main frame 7 on one side, and the second adjusting nut 12 is located outside the first driving block 9 at the top of the main frame 7 on the other side. Multiple placement positions are formed between two adjacent sets of placement racks 4. The first adjusting nut 11 and the second adjusting nut 12 are both threaded onto the transverse screw 3. By applying a certain external force to the first adjusting nut 11 and the second adjusting nut 12, the first adjusting nut 11 and the second adjusting nut 12 can be rotated. By controlling the direction of rotation and the number of rotations, the positions of the first adjusting nut 11 and the second adjusting nut 12 can be flexibly adjusted.

[0042] Among them, such as Figure 3 As shown, multiple sets of placement racks 4 together constitute a grid frame. When multiple sets of grid bodies 5 are fixed on multiple sets of grid frames, the positions of the outermost two placement racks 4 are limited by the first adjusting nut 11 and the second adjusting nut 12. When the positions of the outermost two placement racks 4 are limited, the other placement racks 4 can no longer move, thus clamping and securing the multiple sets of grid bodies 5 in the placement position, thereby stabilizing the multiple sets of grid bodies 5 and improving the safety during transportation.

[0043] When adjusting the first adjusting nut 11 and the second adjusting nut 12, such as Figure 6 As shown, manually rotate the first adjusting nut 11 to move it to the outside of the first drive block 9 on the top of one side of the main frame 7, and make it tightly against the first drive block 9, as shown. Figure 7 As shown, manually rotate the second adjusting nut 12 to move it to the outside of the first drive block 9 on the top of the main frame 7 on the other side, and make it close to the first drive block 9. The positions of the outermost two side placement frames 4 are limited by the first adjusting nut 11 and the second adjusting nut 12. The limiting method is simple and easy to operate.

[0044] In some examples, a second drive block 14 is provided at both ends of the transverse screw 3. The second drive block 14 at one end of the transverse screw 3 is slidably sleeved on the vertical screw 13. Two sets of third adjusting nuts 15 are located above and below the second drive block 14, respectively. The second drive block 14 at one end of the transverse screw 3 can slide along the axial direction of the vertical screw 13.

[0045] In some examples, the second side frame 2 includes a slide rod 16, and a second drive block 14 at the other end of the transverse screw 3 is slidably sleeved on the slide rod 16. The second drive block 14 at the other end of the transverse screw 3 can slide along the axial direction of the slide rod 16.

[0046] Since the second drive blocks 14 at both ends of the transverse screw 3 can slide along the axial direction of the vertical screw 13 and the slide bar 16 respectively, the position of the transverse screw 3 relative to the vertical screw 13 is adjustable, and the spacing between two adjacent sets of transverse screws 3 is adjustable. That is, the axial position of the placement frame 4 in the up and down direction is adjustable, and the axial position of the transverse screw 3 can be adjusted according to the size of the plate grid body 5, so as to adjust the axial position of multiple sets of placement frames 4.

[0047] After the axial position of the second drive block 14 is adjusted, as follows: Figure 8 As shown, the two sets of third adjusting nuts 15 are screwed to the upper and lower ends of the second drive block 14 respectively. The upper third adjusting nut 15 is in close contact with the upper end face of the second drive block 14, and the lower second drive block 14 is in close contact with the lower end face of the second drive block 14. The position of the second drive block 14 is limited by the two sets of third adjusting nuts 15 to keep it stable, thereby realizing the limitation of the axial position of multiple sets of placement racks 4.

[0048] In some examples, both the main frame 7 and the sub-frame 8 include a square column 17 and a support plate 18. One end of the support plate 18 is slidably embedded in the square column 17. The square column 17 and the support plate 18 are fixed together by a tightening screw 21. Loosening the tightening screw 21 releases the fastening force between the square column 17 and the support plate 18, allowing them to slide relative to each other. Applying a certain external force to the support plate 18 can stretch one end of the support plate 18 out of the square column 17, thereby adjusting the extension length of the support plate 18 relative to the square column 17 and adjusting the total length of the main frame 7 and the sub-frame 8. After adjustment, tightening the tightening screw 21 is used to re-tighten it.

[0049] In some examples, vertical grooves 19 are provided on both sides of the square column 17, and horizontal grooves 20 are provided on both sides of the upper end face of the support plate 18. The vertical groove 19 on one side of the square column 17 and the horizontal groove 20 on one side of the support plate 18 form a set of limiting slots. The vertical groove 19 on the other side of the square column 17 and the horizontal groove 20 on the other side of the support plate 18 form a set of limiting slots. Limiting slots are provided on both sides of the main frame 7 and the auxiliary frame 8. The side of the plate grid body 5 is limited by the limiting slots, so as to achieve the initial fixation of the plate grid body 5.

[0050] Since the extension length of the support plate 18 relative to the square post 17 is adjustable, the relative distance between the horizontal groove 20 and the vertical groove 19 is also adjustable. According to the length of the plate grid body 5, the extension length of the support plate 18 relative to the square post 17 is adjusted accordingly, and the size of the limiting slot is adjusted so that the size of the limiting slot is adapted to the length of the plate grid body 5.

[0051] In some examples, a first elastic liner 22 is provided in the vertical groove 19, and a second elastic liner 23 is provided in the horizontal groove 20. Both the first elastic liner 22 and the second elastic liner 23 have a certain degree of elasticity. When the side of the grating body 5 is inserted into the limiting slot, the first elastic liner 22 is tightly attached to the side of the grating body 5 by its own elastic force, and the second elastic liner 23 is tightly attached to the side of the grating body 5 by its own elastic force. The grating body 5 is initially fixed by the elastic force of the first elastic liner 22 and the second elastic liner 23.

[0052] Among them, the first elastic liner 22 and the second elastic liner 23 can both produce a certain elastic deformation to adapt to the side thickness of the grid body 5, so that the limiting groove formed by the vertical groove 19 and the horizontal groove 20 is suitable for grid bodies 5 with different thicknesses.

[0053] In some examples, the transverse screw 3 is fixed to the second drive block 14 by a slot, the first side frame 1 is fixed to the base 6 by screws, and the second side frame 2 is fixed to the base 6 by screws.

[0054] The second drive block 14 is detachably connected to the transverse screw 3, the first side frame 1 is detachably connected to the base 6, and the second side frame 2 is detachably connected to the base 6. After removing the side frame, applying a certain external force to the second drive block 14 can separate the second drive block 14 from the transverse screw 3. After the transverse screw 3 is separated from the second drive block 14, the multiple sets of placement racks 4 on the transverse screw 3 can be removed individually. When the placement rack 4 is partially damaged, the replacement and maintenance of the placement rack 4 are convenient, and the number of placement racks 4 can be selectively set according to the usage requirements.

[0055] By adopting the above technical solution:

[0056] The horizontal mounting positions of multiple sets of placement racks 4 relative to the transverse screw 3 are adjustable. The width of the placement position formed between two adjacent sets of placement racks 4 is adjustable. The extension length of the support plate 18 relative to the square column 17 is adjustable, so that the length of the limiting groove formed by the vertical groove 19 and the transverse groove 20 is adjustable. The axial position of the transverse screw 3 relative to the vertical screw 13 is adjustable, so that the axial spacing of the placement racks 4 in the vertical direction is adjustable. The elastic lining of the limiting groove adapts to the side thickness of the grating body 5 by its own elastic force. In summary, multiple sets of placement racks 4 constitute a grating frame. The grating frame includes multiple placement positions, and the length and width of the placement positions are adjustable. The width of the placement position adapts to the side thickness of the grating body 5. The overall grating frame is suitable for grating bodies 5 of different sizes, and can realize the layered placement and fixing of various grating bodies 5, improving the flexibility and versatility of the grating frame during use.

[0057] Example 2:

[0058] Based on Example 1, this example describes the specific structure of the base 6 in a layered grid frame of a lead-acid battery. The base 6 has fixed frames 24 on both sides of its upper end. The top of the fixed frame 24 is provided with a hydraulic cylinder 25 and a hydraulic oil tank assembly 28. The hydraulic oil tank assembly 28 includes components such as an oil tank, a pump body, an oil pipe, and valves. One end of the hydraulic cylinder 25 is connected to a movable frame 26. The hydraulic cylinder 25 includes a push rod, and one end of the push rod is fixedly connected to the movable frame 26. The movable frame 26 is provided with two sets of rollers 27.

[0059] Under normal conditions, the rollers 27 are raised, the base 6 is in stable contact with the ground, and the entire scaffold remains stable. When the scaffold needs to be moved or transported, the hydraulic cylinder 25 is controlled to work. The push rod of the hydraulic cylinder 25 drives the moving frame 26 to move. The moving frame 26 drives the rollers 27 to move down, so that the four sets of rollers 27 are in contact with the ground, and the base 6 and the frame structure above the base 6 are raised. At this time, the scaffold is in contact with the ground through the four sets of rollers 27, making it easy to move the scaffold.

[0060] By adopting the above technical solution:

[0061] The hydraulic cylinder 25 drives the roller 27 to lift up, making the base 6 firmly in contact with the ground and keeping the overall grid frame stable. The hydraulic cylinder 25 then drives the roller 27 to move down, making the four sets of rollers 27 in contact with the ground and lifting the base 6 and the frame structure above the base 6. At this time, the grid frame is easy to move and can be quickly transferred without the need for a forklift, which facilitates the subsequent processing of multiple grid bodies 5.

[0062] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A layered grid frame for lead-acid batteries, comprising a first side frame (1) and a second side frame (2), characterized in that: Multiple sets of transverse screws (3) are provided between the first side frame (1) and the second side frame (2). Multiple sets of placement racks (4) are provided on the transverse screws (3). A plate grid body (5) is placed between two adjacent sets of placement racks (4). A base (6) is provided at the lower end of the first side frame (1) and the second side frame (2). The placement rack (4) includes a main frame body (7) and multiple sets of sub-frame bodies (8). A first adjusting nut (11) and a second adjusting nut (12) are threaded on the transverse screws (3). The first side frame (1) includes a vertical screw (13). Multiple sets of third adjusting nuts (15) are sleeved on the vertical screws (13). The main frame (7) and the sub-frame (8) both include a square column (17) and a support plate (18). One end of the support plate (18) is slidably embedded in the square column (17). The square column (17) and the support plate (18) are fixed together by a tightening screw (21). Vertical grooves (19) are provided on both sides of the square column (17), and horizontal grooves (20) are provided on both sides of the upper end face of the support plate (18). The vertical groove (19) is provided with a first elastic liner (22), and the horizontal groove (20) is provided with a second elastic liner (23).

2. The layered grid frame for a lead-acid battery according to claim 1, characterized in that: The main frame (7) and the sub-frame (8) are fixedly connected by a crossbar. The top of the main frame (7) is welded and fixed with a first driving block (9). The first driving block (9) has a through hole (10). The first driving block (9) of the main frame (7) is slidably sleeved on the transverse screw (3).

3. A layered grid frame for a lead-acid battery according to claim 2, characterized in that: The first adjusting nut (11) is located on the outside of the first drive block (9) at the top of the main frame (7) on one side, and the second adjusting nut (12) is located on the outside of the first drive block (9) at the top of the main frame (7) on the other side. Multiple placement positions are formed between the two adjacent sets of placement racks (4).

4. The layered grid frame for a lead-acid battery according to claim 1, characterized in that: The transverse screw (3) is provided with a second drive block (14) at both ends. The second drive block (14) at one end of the transverse screw (3) is slidably sleeved on the vertical screw (13). The two sets of third adjusting nuts (15) are located above and below the second drive block (14) respectively.

5. A layered grid frame for a lead-acid battery according to claim 4, characterized in that: The second side frame (2) includes a slide rod (16), and the second drive block (14) at the other end of the transverse screw (3) is slidably sleeved on the slide rod (16).

6. A layered grid frame for a lead-acid battery according to claim 4, characterized in that: The transverse screw (3) is fixed to the second drive block (14) by a slot, the first side frame (1) is fixed to the base (6) by screws, and the second side frame (2) is fixed to the base (6) by screws.

7. A layered grid frame for a lead-acid battery according to claim 1, characterized in that: The base (6) has fixed frames (24) on both sides of its upper end. The top of the fixed frame (24) is equipped with a hydraulic cylinder (25) and a hydraulic oil tank assembly (28). One end of the hydraulic cylinder (25) is connected to a movable frame (26). The movable frame (26) is equipped with two sets of rollers (27).

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