Tension control device

Abstract

The utility model discloses a tension control device which comprises a rack, a rotating shaft, a swing roller, a driving assembly and two swing arms. Wherein the rotating shaft is connected to the rack in a rotating mode, the two swing arms are connected to the rotating shaft and arranged in parallel, one end of the swing roller is connected to one swing arm in a rotating mode, the other end of the swing roller is connected to the other swing arm in a rotating mode, the swing roller is parallel to the rotating shaft, and the two swing arms are connected to the rotating shaft in a rotating mode. The driving assembly is connected to the rack, connected with the rotating shaft and used for driving the rotating shaft to rotate so as to drive the swing arm and the swing roller to swing. According to the utility model, the two swing arms can be stressed in a balanced manner, the parallelism of the two swing arms is ensured to be stable and not damaged, the inclination phenomenon of the swing roller can be avoided, the parallelism of the two swing arms does not need to be corrected and adjusted frequently, the use is more convenient, and the production efficiency and the product quality are not influenced.

Description

Technical Field

[0001] This utility model relates to a tension control device. Background Technology

[0002] Currently, tension control devices are used to control the tension in film material within a stable range. For example, Chinese patent CN209009774U discloses a swing roller tension control device, which includes a tension roller, a swing roller, a low-friction cylinder, a swing roller guide rod, and two swing arms, one on the left and one on the right. During operation, the tension roller detects the tension, and then the low-friction cylinder drives one of the swing arms to rotate. The rotating swing arm then drives the swing roller guide rod to rotate, and the swing roller guide rod then drives the other swing arm to rotate, so that the two swing arms together drive the swing roller to swing and adjust the tension. However, only one of the two swing arms is driven by the low-friction cylinder. This unilateral force structure causes the stressed swing arm to deviate at an angle after a period of use, which disrupts the parallelism of the two swing arms and causes the swing roller to tilt, resulting in a decrease in product quality. Therefore, the parallelism of the two swing arms needs to be corrected and adjusted after a period of use, which is very inconvenient and affects production efficiency. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a tension control device that can make the two swing arms bear the force equally, ensure that the parallelism of the two swing arms is stable and not damaged, and thus avoid the tilting of the swing roller. Therefore, it is not necessary to frequently correct and adjust the parallelism of the two swing arms, making it more convenient to use and not affecting production efficiency and product quality.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a tension control device, including a frame, a rotating shaft, a swing roller, a drive assembly and two swing arms;

[0005] The rotating shaft is rotatably connected to the frame;

[0006] The two swing arms are respectively connected to the rotating shaft and arranged in parallel;

[0007] One end of the swing roller is rotatably connected to one of the swing arms, and the other end of the swing roller is rotatably connected to the other swing arm. The swing roller is parallel to the rotating shaft.

[0008] The drive assembly is connected to the frame and the rotating shaft, and is used to drive the rotating shaft to rotate, thereby causing the swing arm and the swing roller to swing.

[0009] Furthermore, the swing arm is connected to the rotating shaft via a shrink sleeve.

[0010] To further enhance structural strength, the tension control device also includes a reinforcing rod, one end of which is connected to one of the swing arms and the other end of which is connected to the other swing arm. The reinforcing rod is located between the rotating shaft and the swing roller.

[0011] Furthermore, the swing roller and the swing arm are rotatably connected by a bearing, the swing arm is provided with a mounting hole for installing the bearing, and a cover plate for covering the mounting hole is also connected to the swing arm.

[0012] Furthermore, to reduce weight, the swing arm is provided with weight-reducing holes, and / or the swing roller is a hollow aluminum roller.

[0013] A further specific structure of the drive assembly is provided, the drive assembly including a drive rod and a drive cylinder; wherein, the drive rod is connected to the rotating shaft, one end of the drive cylinder is hinged to the frame, and the other end of the drive cylinder is hinged to the drive rod, the drive cylinder being used to drive the drive rod to swing, thereby driving the rotating shaft to rotate.

[0014] Furthermore, the two swing arms are respectively the first swing arm and the second swing arm;

[0015] The frame is also connected to a first limiter and a second limiter;

[0016] The first limiter is located on one side of the first swing arm and is used to limit the first swing arm by abutting against it when the first swing arm swings to its limit position to one side.

[0017] The second limiter is located on the other side of the first swing arm and is used to limit the first swing arm by abutting against it when the first swing arm swings to its limit position to the other side.

[0018] Further, another specific structure of the drive assembly is provided, the drive assembly including a mounting bracket and a drive motor;

[0019] The mounting bracket is connected to the frame;

[0020] The drive motor is connected to the mounting bracket and to the rotating shaft, and is used to drive the rotating shaft to rotate.

[0021] Furthermore, the tension control device also includes a left support, a right support, a first blocking member, a second blocking member, a third blocking member, and a fourth blocking member;

[0022] The two swing arms are referred to as the first swing arm and the second swing arm, respectively.

[0023] The left support and the right support are respectively connected to the frame;

[0024] Both the first blocking member and the second blocking member are connected to the left bracket;

[0025] Both the third and fourth blocking components are connected to the right bracket;

[0026] The first blocking member is located on one side of the first swing arm and is used to stop the first swing arm by abutting against it when the first swing arm swings to its limit position to one side.

[0027] The second blocking member is located on the other side of the first swing arm and is used to stop the first swing arm by abutting against it when the first swing arm swings to its limit position to the other side.

[0028] The third blocking member is located on one side of the second swing arm and is used to stop the second swing arm by abutting against it when the second swing arm swings to its limit position to one side.

[0029] The fourth blocking member is located on the other side of the second swing arm and is used to limit the movement of the second swing arm by abutting against it when the second swing arm swings to its limit position to the other side.

[0030] Furthermore, the left bracket includes a left base plate, a first mounting plate, and a second mounting plate;

[0031] The left base plate is connected to the frame, and the first mounting plate and the second mounting plate are both connected to the left base plate. The first mounting plate is provided with a first waist-shaped hole, and the second mounting plate is provided with a second waist-shaped hole.

[0032] The first blocking member passes through the first waist-shaped hole, and the first blocking member is threadedly connected with a first nut that abuts against one end face of the first mounting plate and a second nut that abuts against the other end face of the first mounting plate.

[0033] The second blocking member passes through the second waist-shaped hole, and the second blocking member is threadedly connected with a third nut that abuts against one end face of the second mounting plate and a fourth nut that abuts against the other end face of the second mounting plate;

[0034] The right bracket includes a right base plate, a third mounting plate, and a fourth mounting plate;

[0035] The right base plate is connected to the frame, and the third mounting plate and the fourth mounting plate are both connected to the right base plate. The third mounting plate is provided with a third oblong hole, and the fourth mounting plate is provided with a fourth oblong hole.

[0036] The third blocking member passes through the third waist-shaped hole, and the third blocking member is threadedly connected with a fifth nut that abuts against one end face of the third mounting plate and a sixth nut that abuts against the other end face of the third mounting plate;

[0037] The fourth blocking member passes through the fourth waist-shaped hole, and the fourth blocking member is threadedly connected with a seventh nut that abuts against one end face of the fourth mounting plate and an eighth nut that abuts against the other end face of the fourth mounting plate.

[0038] With the above technical solution, the film material can be connected to the swing roller. When the tension in the film material fluctuates, the drive component can drive the rotating shaft to rotate, thereby causing the swing arms and the swing roller to swing. The swing of the swing roller can eliminate the tension changes in the film material, thus adjusting the tension in the film material to a stable range. Specifically, the driving force of the drive component can drive the rotating shaft to rotate, and then the rotating shaft simultaneously drives the two swing arms to swing, thereby causing the swing roller to swing. This ensures that the two swing arms are subjected to balanced forces, maintaining stable parallelism between them and preventing the swing roller from tilting. Therefore, frequent adjustments to the parallelism of the two swing arms are unnecessary, making it more convenient to use and avoiding impacts on production efficiency and product quality. Attached Figure Description

[0039] Figure 1 This is a perspective view of the tension control device in Embodiment 1 of this utility model;

[0040] Figure 2 This is a side view of the tension control device in Embodiment 1 of this utility model;

[0041] Figure 3 for Figure 2 AA section view;

[0042] Figure 4 for Figure 3 Detailed view of section B in the middle;

[0043] Figure 5 This is a perspective view of the tension control device in Embodiment 2 of this utility model;

[0044] Figure 6 This is a front view of the tension control device in Embodiment 2 of this utility model;

[0045] In the diagram: 1. Rotating shaft; 2. Swing roller; 3. Swing arm; 4. Expansion sleeve; 5. Reinforcing rod; 6. Bearing; 7. Mounting hole; 8. Cover plate; 9. Weight reduction hole; 10. Drive rod; 11. Drive cylinder; 12. First limiter; 13. Second limiter; 14. Mounting bracket; 15. Drive motor; 16. Left bracket; 17. Right bracket; 18. First blocking component; 19. Second blocking component; 20. Third blocking component; 21. Left base plate; 22. First mounting plate; 23. First oblong hole; 24. Right base plate; 25. Third mounting plate; 26. Third oblong hole. Detailed Implementation

[0046] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0047] Example 1

[0048] like Figures 1-3 As shown, a tension control device includes a frame, a rotating shaft 1, a swing roller 2, a drive assembly, and two swing arms 3;

[0049] The rotating shaft 1 is rotatably connected to the frame;

[0050] The two swing arms 3 are respectively connected to the rotating shaft 1 and arranged in parallel;

[0051] One end of the swing roller 2 is rotatably connected to one of the swing arms 3, and the other end of the swing roller 2 is rotatably connected to the other swing arm 3. The swing roller 2 is parallel to the rotating shaft 1.

[0052] The drive assembly is connected to the frame and the rotating shaft 1, and is used to drive the rotating shaft 1 to rotate, thereby causing the swing arms 3 and the swing roller 2 to swing. Specifically, the film material can be connected to the swing roller 2. When the tension in the film material fluctuates, the drive assembly can drive the rotating shaft 1 to rotate, thereby causing the swing arms 3 and the swing roller 2 to swing. The swing of the swing roller 2 can eliminate the tension changes in the film material, thereby adjusting the tension in the film material to a stable range. The driving force of the drive assembly can drive the rotating shaft 1 to rotate, and then the rotating shaft 1 simultaneously drives the two swing arms 3 to swing, thereby driving the swing roller 2 to swing. This ensures that the two swing arms 3 are subjected to balanced force, maintains the parallelism between the two swing arms 3, and prevents the swing roller 2 from tilting. Therefore, it is not necessary to frequently correct and adjust the parallelism of the two swing arms 3, making it more convenient to use and avoiding any impact on production efficiency and product quality.

[0053] like Figure 3 As shown, the swing arm 3 can be connected to the rotating shaft 1 by a tension sleeve 4, and the swing arm 3 and the rotating shaft 1 are tightened and fixed together. The tension sleeve 4 is existing technology.

[0054] like Figure 1 , 3 As shown, the tension control device may further include a reinforcing rod 5, one end of which is connected to one of the swing arms 3, and the other end of which is connected to the other swing arm 3. The reinforcing rod 5 is located between the rotating shaft 1 and the swing roller 2.

[0055] like Figures 1-4As shown, the swing roller 2 and the swing arm 3 are rotatably connected by a bearing 6. The swing arm 3 is provided with a mounting hole 7 for installing the bearing 6. A cover plate 8 for covering the mounting hole 7 is also connected to the swing arm 3. In this embodiment, the cover plate 8 can be made of transparent material.

[0056] like Figures 1-3 As shown, the swing arm 3 may be provided with weight reduction holes 9, and the swing roller 2 may be a hollow aluminum roller.

[0057] like Figures 1-3 As shown, the drive assembly may include a drive rod 10 and a drive cylinder 11; wherein, the drive rod 10 is connected to the rotating shaft 1, one end of the drive cylinder 11 is hinged to the frame, and the other end of the drive cylinder 11 is hinged to the drive rod 10, and the drive cylinder 11 is used to drive the drive rod 10 to swing, thereby driving the rotating shaft 1 to rotate; specifically, the drive cylinder 11 may be a frictionless cylinder.

[0058] like Figure 1 , 2 As shown, the two swing arms 3 are the first swing arm and the second swing arm, respectively;

[0059] The frame is also connected to a first limiter 12 and a second limiter 13;

[0060] The first limiter 12 is located on one side of the first swing arm and is used to stop the first swing arm when it swings to the limit position on one side by abutting against the first swing arm.

[0061] The second limiter 13 is located on the other side of the first swing arm and is used to limit the first swing arm by abutting against the first swing arm when the first swing arm swings to the limit position on the other side; in this embodiment, both the first limiter 12 and the second limiter 13 are polyurethane limiters.

[0062] Example 2

[0063] like Figure 5 , 6 As shown, another tension control device includes a frame, a rotating shaft 1, a swing roller 2, a drive assembly, and two swing arms 3;

[0064] The rotating shaft 1 is rotatably connected to the frame;

[0065] The two swing arms 3 are respectively connected to the rotating shaft 1 and arranged in parallel;

[0066] One end of the swing roller 2 is rotatably connected to one of the swing arms 3, and the other end of the swing roller 2 is rotatably connected to the other swing arm 3. The swing roller 2 is parallel to the rotating shaft 1.

[0067] The drive assembly is connected to the frame and the rotating shaft 1, and is used to drive the rotating shaft 1 to rotate, thereby causing the swing arms 3 and the swing roller 2 to swing. Specifically, the film material can be connected to the swing roller 2. When the tension in the film material fluctuates, the drive assembly can drive the rotating shaft 1 to rotate, thereby causing the swing arms 3 and the swing roller 2 to swing. The swing of the swing roller 2 can eliminate the tension changes in the film material, thereby adjusting the tension in the film material to a stable range. The driving force of the drive assembly can drive the rotating shaft 1 to rotate, and then the rotating shaft 1 simultaneously drives the two swing arms 3 to swing, thereby driving the swing roller 2 to swing. This ensures that the two swing arms 3 are subjected to balanced force, maintains the parallelism between the two swing arms 3, and prevents the swing roller 2 from tilting. Therefore, it is not necessary to frequently correct and adjust the parallelism of the two swing arms 3, making it more convenient to use and avoiding any impact on production efficiency and product quality.

[0068] like Figure 5 , 6 As shown, the swing arm 3 can be connected to the rotating shaft 1 by a tension sleeve 4, and the swing arm 3 and the rotating shaft 1 are tightened and fixed together. The tension sleeve 4 is existing technology.

[0069] like Figure 5 , 6 As shown, the tension control device may further include a reinforcing rod 5, one end of which is connected to one of the swing arms 3, and the other end of which is connected to the other swing arm 3. The reinforcing rod 5 is located between the rotating shaft 1 and the swing roller 2.

[0070] Specifically, the swing roller 2 and the swing arm 3 are rotatably connected by a bearing 6. The swing arm 3 is provided with a mounting hole 7 for installing the bearing 6, and a cover plate 8 for covering the mounting hole 7 is also connected to the swing arm 3. In this embodiment, the cover plate 8 can be made of transparent material.

[0071] In this embodiment, the swing arm 3 may be provided with weight reduction holes 9, and the swing roller 2 may be a hollow aluminum roller.

[0072] like Figure 5 , 6 As shown, the drive assembly may include a mounting bracket 14 and a drive motor 15;

[0073] The mounting bracket 14 is connected to the frame;

[0074] The drive motor 15 is connected to the mounting bracket 14 and connected to the rotating shaft 1 to drive the rotating shaft 1 to rotate. Specifically, the drive motor 15 is connected to the rotating shaft 1 through a coupling. Using the drive motor 15, the rotating shaft 1 can be driven to rotate more precisely, and the operation is more stable, reliable and without fluctuations.

[0075] like Figure 5 , 6 As shown, the tension control device may further include a left support 16, a right support 17, a first blocking member 18, a second blocking member 19, a third blocking member 20, and a fourth blocking member;

[0076] The two swing arms 3 are the first swing arm and the second swing arm, respectively;

[0077] The left support 16 and the right support 17 are respectively connected to the frame;

[0078] Both the first blocking member 18 and the second blocking member 19 are connected to the left bracket 16;

[0079] Both the third blocking member 20 and the fourth blocking member are connected to the right bracket 17;

[0080] The first blocking member 18 is located on one side of the first swing arm and is used to stop the first swing arm by abutting against the first swing arm when the first swing arm swings to the extreme position to one side.

[0081] The second blocking member 19 is located on the other side of the first swing arm and is used to stop the first swing arm by abutting against the first swing arm when the first swing arm swings to the limit position on the other side.

[0082] The third blocking member 20 is located on one side of the second swing arm and is used to stop the second swing arm by abutting against it when the second swing arm swings to the extreme position to one side.

[0083] The fourth blocking member is located on the other side of the second swing arm and is used to limit the movement of the second swing arm by abutting against it when the second swing arm swings to its limit position to the other side.

[0084] like Figure 5 , 6 As shown, the left bracket 16 may include a left base plate 21, a first mounting plate 22, and a second mounting plate;

[0085] The left base plate 21 is connected to the frame, and the first mounting plate 22 and the second mounting plate are both connected to the left base plate 21. The first mounting plate 22 is provided with a first waist-shaped hole 23, and the second mounting plate is provided with a second waist-shaped hole.

[0086] The first blocking member 18 passes through the first waist-shaped hole 23. The first blocking member 18 is threaded with a first nut that abuts against one end face of the first mounting plate 22 and a second nut that abuts against the other end face of the first mounting plate 22. The first blocking member 18 is then locked to the first mounting plate 22 by the first nut and the second nut.

[0087] The second blocking member 19 passes through the second waist-shaped hole. The second blocking member 19 is threaded with a third nut that abuts against one end face of the second mounting plate and a fourth nut that abuts against the other end face of the second mounting plate. The second blocking member 19 is then locked to the second mounting plate by the third nut and the fourth nut.

[0088] The right bracket 17 may include a right base plate 24, a third mounting plate 25 and a fourth mounting plate;

[0089] The right base plate 24 is connected to the frame, and the third mounting plate 25 and the fourth mounting plate are both connected to the right base plate 24. The third mounting plate 25 is provided with a third oblong hole 26, and the fourth mounting plate is provided with a fourth oblong hole.

[0090] The third blocking member 20 passes through the third waist-shaped hole 26. The third blocking member 20 is threaded with a fifth nut that abuts against one end face of the third mounting plate 25 and a sixth nut that abuts against the other end face of the third mounting plate 25. The third blocking member 20 is then locked to the third mounting plate 25 by the fifth nut and the sixth nut.

[0091] The fourth blocking member passes through the fourth oblong hole. A seventh nut, which abuts against one end face of the fourth mounting plate, and an eighth nut, which abuts against the other end face of the fourth mounting plate, are threaded onto the fourth blocking member. The seventh and eighth nuts then lock the fourth blocking member onto the fourth mounting plate. In this embodiment, the first blocking member 18, the second blocking member 19, the third blocking member 20, and the fourth blocking member can all be hydraulic dampers. Of course, in some embodiments, the first blocking member 18, the second blocking member 19, the third blocking member 20, and the fourth blocking member can also be stop rod components.

[0092] In summary, the film material can be connected to the swing roller 2. When the tension in the film material fluctuates, the drive assembly can drive the rotating shaft 1 to rotate, thereby causing the swing arms 3 and the swing roller 2 to swing. The swing of the swing roller 2 can eliminate the tension changes in the film material, thus adjusting the tension in the film material to a stable range. The driving force of the drive assembly can drive the rotating shaft 1 to rotate, and then the rotating shaft 1 simultaneously drives the two swing arms 3 to swing, thereby causing the swing roller 2 to swing. This ensures that the two swing arms 3 are subjected to balanced forces, maintaining stable parallelism between them and preventing the swing roller 2 from tilting. Therefore, frequent adjustments to the parallelism of the two swing arms 3 are unnecessary, making it more convenient to use and avoiding impacts on production efficiency and product quality.

[0093] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tension control device, characterized in that, It includes a frame, a rotating shaft (1), a swing roller (2), a drive assembly, and two swing arms (3); The rotating shaft (1) is rotatably connected to the frame; The two swing arms (3) are respectively connected to the rotating shaft (1) and arranged in parallel; One end of the swing roller (2) is rotatably connected to one of the swing arms (3), and the other end of the swing roller (2) is rotatably connected to the other swing arm (3). The swing roller (2) is parallel to the rotating shaft (1). The drive assembly is connected to the frame and to the rotating shaft (1) and is used to drive the rotating shaft (1) to rotate, thereby causing the swing arm (3) and the swing roller (2) to swing.

2. The tension control device according to claim 1, characterized in that, The swing arm (3) is connected to the rotating shaft (1) via a shrink sleeve (4).

3. The tension control device according to claim 1, characterized in that, It also includes a reinforcing rod (5), one end of which is connected to one of the swing arms (3) and the other end of which is connected to the other swing arm (3). The reinforcing rod (5) is located between the rotating shaft (1) and the swing roller (2).

4. The tension control device according to claim 1, characterized in that, The swing roller (2) and the swing arm (3) are rotatably connected by a bearing (6). The swing arm (3) is provided with a mounting hole (7) for mounting the bearing (6). The swing arm (3) is also connected with a cover plate (8) for covering the mounting hole (7).

5. The tension control device according to claim 1, characterized in that, The swing arm (3) is provided with a weight reduction hole (9), and / or the swing roller (2) is a hollow aluminum roller.

6. The tension control device according to claim 1, characterized in that, The drive assembly includes a drive rod (10) and a drive cylinder (11); wherein the drive rod (10) is connected to the rotating shaft (1), one end of the drive cylinder (11) is hinged to the frame, and the other end of the drive cylinder (11) is hinged to the drive rod (10). The drive cylinder (11) is used to drive the drive rod (10) to swing, thereby driving the rotating shaft (1) to rotate.

7. The tension control device according to claim 6, characterized in that, The two swing arms (3) are the first swing arm and the second swing arm, respectively; The frame is also connected to a first limiter (12) and a second limiter (13); The first limiter (12) is located on one side of the first swing arm and is used to limit the first swing arm by abutting against the first swing arm when the first swing arm swings to the extreme position to one side; The second limiter (13) is located on the other side of the first swing arm and is used to limit the first swing arm by abutting against the first swing arm when the first swing arm swings to the limit position on the other side.

8. The tension control device according to claim 1, characterized in that, The drive assembly includes a mounting bracket (14) and a drive motor (15); The mounting bracket (14) is connected to the frame; The drive motor (15) is connected to the mounting bracket (14) and connected to the rotating shaft (1) to drive the rotating shaft (1) to rotate.

9. The tension control device according to claim 8, characterized in that, It also includes a left support (16), a right support (17), a first blocking member (18), a second blocking member (19), a third blocking member (20), and a fourth blocking member; The two swing arms (3) are the first swing arm and the second swing arm, respectively; The left support (16) and the right support (17) are respectively connected to the frame; The first blocking member (18) and the second blocking member (19) are both connected to the left bracket (16); The third blocking member (20) and the fourth blocking member are both connected to the right bracket (17); The first blocking member (18) is located on one side of the first swing arm and is used to stop the first swing arm by abutting against the first swing arm when the first swing arm swings to the extreme position to one side. The second blocking member (19) is located on the other side of the first swing arm and is used to stop the first swing arm by abutting against the first swing arm when the first swing arm swings to the limit position on the other side; The third blocking member (20) is located on one side of the second swing arm and is used to stop the second swing arm when it swings to the limit position on one side; The fourth blocking member is located on the other side of the second swing arm and is used to stop the second swing arm by abutting against it when the second swing arm swings to its limit position to the other side.

10. The tension control device according to claim 9, characterized in that, The left bracket (16) includes a left base plate (21), a first mounting plate (22), and a second mounting plate; The left base plate (21) is connected to the frame. The first mounting plate (22) and the second mounting plate are both connected to the left base plate (21). The first mounting plate (22) is provided with a first waist-shaped hole (23), and the second mounting plate is provided with a second waist-shaped hole. The first blocking member (18) passes through the first waist-shaped hole (23), and the first blocking member (18) is threaded with a first nut that abuts against one end face of the first mounting plate (22) and a second nut that abuts against the other end face of the first mounting plate (22); The second blocking member (19) passes through the second waist-shaped hole, and the second blocking member (19) is threaded with a third nut that abuts against one end face of the second mounting plate and a fourth nut that abuts against the other end face of the second mounting plate; The right bracket (17) includes a right base plate (24), a third mounting plate (25), and a fourth mounting plate; The right base plate (24) is connected to the frame, and the third mounting plate (25) and the fourth mounting plate are both connected to the right base plate (24). The third mounting plate (25) is provided with a third waist-shaped hole (26), and the fourth mounting plate is provided with a fourth waist-shaped hole. The third blocking member (20) passes through the third waist-shaped hole (26), and the third blocking member (20) is threaded with a fifth nut that abuts against one end face of the third mounting plate (25) and a sixth nut that abuts against the other end face of the third mounting plate (25); The fourth blocking member passes through the fourth waist-shaped hole, and the fourth blocking member is threadedly connected with a seventh nut that abuts against one end face of the fourth mounting plate and an eighth nut that abuts against the other end face of the fourth mounting plate.

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