Aluminum sheet supporting device for mounting rail production

Abstract

This application discloses an aluminum sheet support device for the production of mounting rails, relating to the field of auxiliary equipment for mounting rail production. It includes a support frame with a replacement mechanism at the top. This application utilizes a rotating shaft to drive a rotating block to rotate, which in turn drives a mounting wheel to rotate, thereby allowing the mounting wheels at both ends to be interchanged. This enables timely replacement of the mounting wheel in case of a jamming failure. Simultaneously, the temporary support provided by the auxiliary wheel allows for replacement of the mounting wheel while maintaining support. Unlike existing support devices that require pausing the aluminum sheet roll conveying process and repairing the support device before resuming the automated production line, this application reduces the time spent dealing with device malfunctions and improves production efficiency.

Description

Technical Field

[0001] This application relates to the field of auxiliary equipment for the production of mounting rails, and in particular to an aluminum sheet support device for the production of mounting rails. Background Technology

[0002] In the current installation rail production process, after the aluminum sheet is uncoiled from the uncoiling equipment, it needs a support device to support the aluminum sheet during the process of conveying it to the punching and drilling equipment. This raises the conveying height of the aluminum sheet coil, preventing the aluminum sheet from being misaligned during punching due to its own weight. The support device also keeps the aluminum sheet from contacting the ground and causing wear.

[0003] The existing support equipment uses a single wheel to support aluminum sheets. When the wheel bearing is not lubricated and maintained in time or foreign objects get stuck, the wheel axle will lock up, causing huge friction between the wheel surface and the aluminum sheet, which will damage the surface of the aluminum sheet. In severe cases, it may even break. When it breaks, the aluminum sheet will be thrown out due to stress, causing production safety hazards. At this time, it is necessary to stop the unwinding machine to unwind the coil for maintenance of the support equipment, which will prolong the working time and seriously affect efficiency. Utility Model Content

[0004] To address the problem of wheel lock-up and failure to promptly restore effective support, this application provides an aluminum sheet support device for installation rail production.

[0005] The technical solution provided in this application for an aluminum sheet support device for installing rails is as follows:

[0006] An aluminum sheet support device for installing rails includes a bracket, and a replacement mechanism is provided on the top of the bracket;

[0007] The replacement mechanism includes a rotating shaft I disposed on the top of the bracket. A rotating block for driving the mounting wheel to rotate is fixedly disposed on the outer wall of the rotating shaft I. A handle for driving the threaded rod to rotate is disposed on the outer wall of the rotating shaft I. A sliding rod for driving the top cover to move vertically is disposed on the top of the rotating block. An auxiliary wheel for rotating along the direction of the three rods of the fixed shaft is disposed at the bottom of the top cover. The auxiliary wheel is disposed parallel to the mounting wheel. Support plates II for supporting the mounting wheel are horizontally symmetrically disposed at the upper and lower ends of the rotating block.

[0008] By adopting the above technical solution, the auxiliary wheel moves vertically with the top cover, thereby lifting the aluminum sheet roll from both sides, which facilitates the rotation and replacement of the mounting wheel. The rotating shaft drives the rotating block to rotate, thereby allowing the mounting wheel to be swapped up and down.

[0009] Preferably, a support plate is fixedly connected to the top of the bracket, one side wall of the support plate is movably connected to a rotating shaft, a connecting plate is fixedly connected to the outer wall of the rotating shaft, a connecting cylinder is fixedly connected to the end of the connecting plate away from the rotating shaft, a threaded rod is threaded through one side wall of the connecting cylinder, and a handle is fixedly connected to one end of the threaded rod.

[0010] By adopting the above technical solution, the connecting cylinder is rotated around the axis of the rotating shaft by gripping the handle, which facilitates the rotation of the rotating shaft.

[0011] Preferably, a connecting block one is fixedly connected to one side wall of the support plate, a connecting block two is fixedly connected to the end of the connecting block one away from the support plate one, the connecting block two is inserted into the threaded rod, the outer wall of the rotating shaft one is fixedly connected to the rotating block, and the upper and lower ends of the rotating block are fixedly connected to the support plate two.

[0012] By adopting the above technical solution, the threaded rod is inserted into the connecting block two, thereby limiting the rotation of the connecting cylinder one by the connecting block two, thus achieving the effect of rotation locking.

[0013] Preferably, a second rotating shaft is movably passed through the second side wall of the support plate, a limit plate is fixedly connected to the outer wall of the second rotating shaft, a mounting wheel is movably passed through the outer wall of the second rotating shaft, and a second connecting plate is fixedly connected to the outer wall of the first rotating shaft.

[0014] By adopting the above technical solution, the two sides of the rotating shaft are limited by the limiting plate, and the mounting wheel is slidably connected to the rotating shaft so that when the aluminum sheet roll deviates during the conveying process, the mounting wheel can slide in a small range to adapt in time, avoiding friction between the edge of the aluminum sheet roll and the two sides of the mounting wheel.

[0015] Preferably, the end of the connecting plate two away from the rotating shaft one is fixedly connected to a fixed shaft one, a connecting rod is movably passed through the outer wall of the fixed shaft one, the side wall of the connecting rod away from the fixed shaft one is movably passed through the fixed shaft two, and one end of the fixed shaft two is fixedly connected to a sliding rod.

[0016] By adopting the above technical solution, the rotation of the connecting plate 2 is converted into the vertical movement of the sliding rod through the connecting rod, thereby realizing motion conversion.

[0017] Preferably, a limiting block is movably passed through the outer wall of the sliding rod and fixedly connected to one side wall of the support plate, a connecting column is fixedly passed through the side wall of the sliding rod away from the fixed shaft, and a sliding plate is fixedly passed through the outer wall of the connecting column.

[0018] By adopting the above technical solution, the limiting block ensures that the sliding rod can only move vertically and cannot rotate, thus making the vertical movement of the sliding rod more stable.

[0019] Preferably, a top cover is fixedly connected to the side wall of the sliding plate, and a sliding block is fixedly connected to the side wall of the sliding plate, which movably penetrates one side wall of the support plate. A limiting piece is fixedly connected to the end of the sliding block away from the sliding plate.

[0020] By adopting the above technical solution, the cross-sectional area of ​​the limiting piece is greater than the width of the square groove on one side wall of the support plate, so that the sliding block always maintains a sliding connection with the support plate.

[0021] Preferably, a connecting strip one is fixedly connected to the bottom of the top cover, a connecting strip two is fixedly connected to the bottom of the connecting strip one, a fixing shaft three is fixedly connected to the side wall of the connecting strip two, and the outer wall of the fixing shaft three movably passes through the auxiliary wheel.

[0022] By adopting the above technical solution, the auxiliary wheel does not contact the aluminum sheet in the initial state. After the auxiliary wheel moves vertically to lift the aluminum sheet, the top of the mounting wheel temporarily does not contact the aluminum sheet, thus making the structural movement more reasonable.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By using a rotating shaft to drive a rotating block to rotate, the rotating block will drive the mounting wheel to rotate, thereby realizing the interchange of the mounting wheels at the upper and lower ends. This allows for timely replacement of the mounting wheel when a shaft jamming failure occurs. At the same time, the temporary support of the auxiliary wheel allows the mounting wheel to be replaced while maintaining support. Unlike existing support devices, which require stopping the aluminum sheet coil conveying and repairing the support device before restarting the automated process of the production line, this reduces the time spent dealing with device failures and improves production efficiency.

[0025] 2. By utilizing the cooperation between the top cover and the auxiliary wheel, the aluminum sheet coil mounted on the top of the wheel is protected from accidental collisions with external objects. In the event of accidental breakage of the aluminum sheet coil at the support point, stress concentration could cause the aluminum sheet coil to fly out, resulting in a safety accident. The top cover can prevent the aluminum sheet coil from flying out, thereby further improving safety performance. Attached Figure Description

[0026] Figure 1 This is an overall schematic diagram of the present application;

[0027] Figure 2 This is a partial schematic diagram of the grip area in this application;

[0028] Figure 3 This is a partial side sectional view of the grip area in this application;

[0029] Figure 4 This is a partial schematic diagram of a rotating shaft in this application;

[0030] Figure 5 This is a schematic diagram of the part at the rotating block in this application;

[0031] Figure 6 This is a partial schematic diagram of the sliding rod in this application;

[0032] Figure 7 This is a partial side section diagram of the top cover of this application.

[0033] Figure label:

[0034] 1. Bracket;

[0035] 2. Replacement mechanism; 21. Support plate one; 22. Rotating shaft one; 23. Connecting plate one; 24. Connecting cylinder one; 25. Threaded rod; 26. Handle; 27. Connecting block one; 28. Connecting block two; 29. ​​Rotating block; 210. Support plate two; 211. Rotating shaft two; 212. Limiting plate; 213. Mounting wheel; 214. Connecting plate two; 215. Fixed shaft one;

[0036] 216. Connecting rod; 217. Fixed shaft two; 218. Sliding rod; 219. Limiting block; 220. Connecting column; 221. Sliding plate; 222. Top cover; 223. Sliding block; 224. Limiting piece; 225. Connecting strip one; 226. Connecting strip two; 227. Fixed shaft three; 228. Auxiliary wheel;

[0037] 3. Aluminum sheet and coil. Detailed Implementation

[0038] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail.

[0039] This application discloses an aluminum sheet support device for installing rails.

[0040] Reference Figure 1A support device for aluminum sheet in the production of mounting rails includes a bracket 1. A replacement mechanism 2 is provided on the top of the bracket 1. Support plates 21 are symmetrically fixedly connected to the top of the bracket 1. A circular hole 1 is formed through the side wall of support plate 21, and the circular hole 1 movably passes through a rotating shaft 22, allowing the rotating shaft 22 to be rotatably connected to the support plate 21. A circular hole 23 is formed through the side wall of connecting plate 23, and the outer wall of the rotating shaft 22 is fixedly connected to the circular hole 2, thereby fixing the rotating shaft 22 to the connecting plate 23. The end of the connecting plate 23 away from the rotating shaft 22 is connected to the side wall of a connecting cylinder 24. The connecting cylinder 24 is fixedly connected, with the side of the connecting cylinder 24 away from the handle 26 flush with the side wall of the connecting plate 23 to avoid motion interference. The side wall of the connecting cylinder 24 has a threaded hole 1 through which the threaded rod 25 is threaded through the threaded hole 2, so that the threaded rod 25 is threadedly connected to the connecting cylinder 24. One end of the threaded rod 25 is fixedly connected to the end of the handle 26. The outer wall of the handle 26 has friction texture to facilitate the grip of the operator. The connecting block 27 is symmetrically fixedly connected to the side wall of the support plate 21, and the connecting block 28 is fixedly connected to the end of the connecting block 27 away from the support plate 21.

[0041] In the assembly line of the rail installation factory, the workers pass the aluminum sheet coil 3 from the uncoiling equipment through the mounting wheel 213 located at the upper end of the rotating block 29. The mounting wheel 213 provides rotational support, thereby conveying the aluminum sheet coil 3 to the punching equipment. When the mounting wheel 213 at the upper end of the rotating block 29 is providing normal rotational support, the threaded rod 25 is inserted into the connecting block 28 on one side of the support plate 21. When the mounting wheel 213 at the upper end of the rotating block 29 malfunctions and cannot rotate, the workers first rotate the handle 26. The handle 26 will drive the threaded rod 25, thereby moving the threaded rod 25 away from the connecting cylinder 24. The threaded rod 25 is disengaged from the connecting cylinder 24. Then, the workers grasp the handle 26 and rotate it 180° in an arc. The handle 26 drives the threaded rod 25 to move, the threaded rod 25 drives the connecting cylinder 24 to move, the connecting cylinder 24 drives the connecting plate 23 to move, and the connecting plate 23 drives the rotating shaft 22 to rotate.

[0042] Reference Figures 2-3Connecting block 28 has a non-through circular hole 3 on its side wall, and connecting block 28 is inserted into the other end of threaded rod 25. Rotating block 29 has a through circular hole 4 on its side wall, and rotating block 29 is fixedly connected to rotating shaft 22 through circular hole 4, so that rotating shaft 22 is fixedly connected to rotating block 29. Support plate 210 is symmetrically fixedly connected to the upper and lower ends of rotating block 29. Support plate 210 has a circular hole 5 on its side wall, and rotating shaft 211 is movably connected to rotating shaft 211 through circular hole 5, so that rotating shaft 211 is rotatably connected to support plate 210. Limiting plate 212 has a through circular hole 6 on its side wall, and rotating shaft 211 is fixedly connected to limiting plate 212, so that rotating shaft 211 is movably connected to limiting plate 212. The mounting wheel 213 is mounted on the side wall, which allows the mounting wheel 213 to be rotatably connected to the rotating shaft 211. The top of the mounting wheel 213 is slidably connected to the aluminum sheet roll 3. The rotation of the mounting wheel 213 supports the aluminum sheet roll 3. The outer wall of the rotating shaft 22 is fixedly connected to the end of the connecting plate 214 near the rotating shaft 22. The connecting plate 214 is initially kept in a horizontal state. The side wall of the connecting plate 214 away from the rotating shaft 22 is fixedly connected to the end of the fixed shaft 215 near the connecting plate 214. The side wall of the connecting rod 216 near the fixed shaft 215 has a circular hole 7 through it. The outer wall of the fixed shaft 215 moves through the circular hole 7, thereby allowing the fixed shaft 215 to be rotatably connected to the connecting rod 216.

[0043] When the rotating shaft 22 rotates, it drives the rotating block 29 to rotate. The rotating block 29 drives the support plate 210 to rotate. The support plate 210 drives the rotating shaft 211 and the limiting plate 212 to move synchronously. The rotating shaft 211 drives the mounting wheel 213 to rotate. As the handle 26 drives the threaded rod 25 to rotate to the hole of the connecting block 28 on the other side of the support plate 21, the rotating shaft 22 drives the rotating block 29 to rotate 180°, thereby exchanging the mounting wheels 213 at the top and bottom of the rotating block 29. After the threaded rod 25 is aligned with the hole of the connecting block 28 on the other side, the operator rotates the handle 26 to insert the threaded rod 25 into the connecting block 28, thereby locking it in place. The normally rotating support wheel 213 continues to provide support, while the faulty support wheel 213 is located at the bottom. The faulty support wheel 213 is repaired at the end of the production process or when the aluminum sheet coil 3 is used up and rewound. When the rotating shaft 22 rotates, it will drive the connecting plate 214 to rotate. When the connecting plate 214 rotates, it will drive the connecting rod 216 to gradually change from an inclined state to a vertical state. When the connecting plate 214 rotates 90°, the connecting rod 216 is in a completely vertical state, thereby driving the sliding rod 218 to move vertically. When the connecting plate 214 moves from 90° to 180°, the connecting rod 216 will change from a vertical state to an inclined state, thereby driving the sliding rod 218 to move downward vertically to reset.

[0044] Reference Figures 4-5A circular hole 8 is provided through the side wall of the connecting rod 216 away from the fixed shaft 215. The fixed shaft 217 movably passes through the circular hole 8, thereby making the fixed shaft 217 rotatably connected to the connecting rod 216. The end of the fixed shaft 217 near the sliding rod 218 is fixedly connected to the lower side wall of the sliding rod 218, keeping the sliding rod 218 in a vertical state. A square hole is provided through the top of the limiting block 219. The outer wall of the sliding rod 218 movably passes through the square hole, allowing the sliding rod 218 to slide with the limiting block 219. The end of the limiting block 219 near the side wall of the support plate 21 is connected to the side wall of the support plate 21. A fixed connection is formed. A circular hole 9 is provided through the side wall of the sliding rod 218 away from the fixed shaft 217. The connecting column 220 is fixedly connected through the circular hole 9, thereby making the connecting column 220 and the sliding rod 218 fixedly connected. A circular hole 10 is provided through the side wall of the sliding plate 221. The outer wall of the connecting column 220 is fixedly connected through the circular hole 10, thereby making the connecting column 220 and the sliding plate 221 fixedly connected. The inner wall of the sliding plate 221 away from the support plate 21 is fixedly connected to both sides of the top cover 222. The side wall of the sliding plate 221 is fixedly connected to the sliding block 223. The sliding plate 221 fits against the inner wall of the support plate 21.

[0045] While the rotating block 29 rotates, the connecting rod 216 drives the sliding rod 218 to move vertically upwards. The sliding rod 218 drives the connecting column 220 to move vertically upwards. The connecting column 220 drives the sliding plate 221 to move vertically. The sliding plate 221 drives the top cover 222 to move vertically. The sliding plate 221 drives the sliding block 223 to move vertically. Thus, the sliding block 223 limits the vertical movement of the sliding plate 221, so that the sliding plate 221 can only move vertically.

[0046] Reference Figures 6-7The support plate 21 has symmetrical vertical square grooves on its sidewall. The sliding block 223 is slidably connected to the square grooves, thereby allowing the sliding block 223 to be slidably connected to the support plate 21. The end of the sliding block 223 away from the sliding plate 221 is fixedly connected to the limiting piece 224. The bottom of the top cover 222 is fixedly connected to the top of the connecting strip 225. The side cross-section of the top cover 222 is arc-shaped. The bottom of the connecting strip 225 is fixedly connected to the top of the connecting strip 226. The sidewall of the connecting strip 226 is fixedly connected to the two ends of the fixed shaft 227 near the connecting strip 226. The auxiliary wheel 228 has a through-hole opening on its sidewall. The outer wall of the fixed shaft 227 movably passes through the circular hole eleven, thereby allowing the fixed shaft 227 to be rotatably connected to the auxiliary wheel 228. The movement trajectory of the auxiliary wheel 228 is parallel to the mounting wheel 213, thus eliminating the risk of interference. Within the same rotation range, the fixed shaft 215 rotates around the connecting plate 214 with the arm length radius, so the rotation path of the fixed shaft 215 is greater than the rotation path of the rotating block 29. Therefore, when the rotating shaft 22 starts to rotate, the fixed shaft 215 will drive the sliding rod 218 to move vertically quickly, thereby driving the auxiliary wheel 228 to quickly lift the aluminum sheet coil 3.

[0047] The vertical movement of the sliding block 223 drives the limiting piece 224 to move vertically in sync. The bottom of the top cover 222 can drive the connecting strip 1 225 to move vertically. The connecting strip 1 225 drives the connecting strip 226 to move vertically. The connecting strip 226 drives the fixed shaft 3 227 to move vertically. The auxiliary wheel 228 will lift the bottom of the aluminum sheet roll 3 from both sides. The auxiliary wheel 228 provides temporary support and rotates to support the aluminum sheet roll 3. Thus, the auxiliary wheel 228 first lifts the aluminum sheet roll 3 and then the mounting wheel 213 is switched up and down. Subsequently, the auxiliary wheel 228 moves downward so that the mounting wheel 213 continues to support the aluminum sheet roll 3, thereby realizing the recovery of support failure without stopping the machine.

[0048] The implementation principle of an aluminum sheet support device for installing rails in this application embodiment is as follows:

[0049] When the mounting wheel 213 malfunctions, there is no need to stop the machine. The rotating mechanism swaps its position with the spare mounting wheel 213 at the bottom. First, rotate the operating handle 26 to unlock it, causing the threaded rod 25 to disengage from the current connecting block 28. Then, grip the handle 26 and rotate it 180° in an arc. The threaded rod 25 drives the rotating shaft 22, which in turn drives the rotating block 29 to rotate 180°, swapping the positions of the malfunctioning mounting wheel 213 at the top and the normal mounting wheel 213 at the bottom of the rotating block 29. When the threaded rod 25 aligns with the hole in the connecting block 28 on the other side of the support plate 21, rotate the handle 26 to insert the threaded rod 25 into the hole and lock it in place. At this point, the normal mounting wheel 213 is in the top working position and continues to provide support. During the rotation and swapping process of the rotating block 29, the connecting plate 214 drives the fixed shaft 22. 7 will raise the auxiliary wheels 228 on both sides. The auxiliary wheels 228 are used to support the bottom of the aluminum sheet coil 3 before the mounting wheel 213 is replaced, providing temporary support. After the mounting wheel 213 is replaced, the auxiliary wheels 228 will descend and reset, allowing the normal mounting wheel 213 that has been replaced to the top to continue working. The sliding block 223 ensures that the sliding plate 221 and related components only move vertically. After the faulty mounting wheel 213 is turned to the bottom, it will be repaired when the production process ends or when the aluminum sheet coil 3 is used up and reloaded. The handle 26 is operated to unlock, rotate 180°, and relock. With the assistance of the auxiliary wheels 228, the faulty mounting wheel 213 is swapped with the spare mounting wheel 213 at the bottom, realizing the support function can be quickly restored without stopping the machine. The faulty mounting wheel 213 will be repaired later.

[0050] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An aluminum sheet supporting apparatus for mounting rail production, characterized by: Includes a bracket (1), and a replacement mechanism (2) is provided on the top of the bracket (1); The replacement mechanism (2) includes a rotating shaft (22) set on the top of the bracket (1). A rotating block (29) for driving the mounting wheel (213) to rotate is fixedly set on the outer wall of the rotating shaft (22). A handle (26) for driving the threaded rod (25) to rotate is set on the outer wall of the rotating shaft (22). A sliding rod (218) for driving the top cover (222) to move vertically is set on the top of the rotating block (29). An auxiliary wheel (228) for rotating along the direction of the fixed shaft (227) is set on the bottom of the top cover (222). The auxiliary wheel (228) is set parallel to the mounting wheel (213). Support plates (210) for supporting the mounting wheel (213) are horizontally symmetrically set at the upper and lower ends of the rotating block (29).

2. The aluminum sheet supporting apparatus for mounting rail production according to claim 1, wherein: The top of the bracket (1) is fixedly connected to a support plate (21). The side wall of the support plate (21) is movably connected to the rotating shaft (22). The outer wall of the rotating shaft (22) is fixedly connected to a connecting plate (23). The end of the connecting plate (23) away from the rotating shaft (22) is fixedly connected to a connecting cylinder (24). The side wall of the connecting cylinder (24) is threaded with a threaded rod (25). One end of the threaded rod (25) is fixedly connected to a handle (26).

3. The aluminum sheet supporting apparatus for mounting rail production according to claim 2, wherein: A connecting block 1 (27) is fixedly connected to the side wall of the support plate 1 (21). A connecting block 2 (28) is fixedly connected to the end of the connecting block 1 (27) away from the support plate 1 (21). The connecting block 2 (28) is inserted into the threaded rod (25). The outer wall of the rotating shaft 1 (22) is fixedly connected to the rotating block (29). The upper and lower ends of the rotating block (29) are fixedly connected to the support plate 2 (210).

4. The aluminum sheet supporting apparatus for mounting rail production according to claim 3, wherein: The second support plate (210) has a rotating shaft (211) that is movably passed through its side wall. The outer wall of the rotating shaft (211) is fixedly connected to a limiting disk (212). The outer wall of the rotating shaft (211) has a mounting wheel (213) that is movably passed through its outer wall. The outer wall of the first rotating shaft (22) is fixedly connected to a connecting plate (214).

5. The aluminum sheet supporting apparatus for mounting rail production according to claim 4, wherein: The end of the connecting plate 2 (214) away from the rotating shaft 1 (22) is fixedly connected to the fixed shaft 1 (215). The outer wall of the fixed shaft 1 (215) is movably connected to the connecting rod (216). The side wall of the connecting rod (216) away from the fixed shaft 1 (215) is movably connected to the fixed shaft 2 (217). One end of the fixed shaft 2 (217) is fixedly connected to the sliding rod (218).

6. The aluminum sheet supporting apparatus for mounting rail production according to claim 5, wherein: The outer wall of the sliding rod (218) is movably penetrated by a limiting block (219) that is fixedly connected to the side wall of the support plate (21). The side wall of the sliding rod (218) away from the fixed shaft (217) is fixedly penetrated by a connecting column (220). The outer wall of the connecting column (220) is fixedly penetrated by a sliding plate (221).

7. The aluminum sheet support equipment for installing rails according to claim 6, characterized in that: A top cover (222) is fixedly connected to the side wall of the sliding plate (221), and a sliding block (223) is fixedly connected to the side wall of the sliding plate (221) and movably penetrates the side wall of the support plate (21). A limiting piece (224) is fixedly connected to the end of the sliding block (223) away from the sliding plate (221).

8. The aluminum sheet supporting apparatus for mounting rail production according to claim 7, wherein: The top cover (222) is fixedly connected to the bottom of a connecting strip one (225), the bottom of the connecting strip one (225) is fixedly connected to a connecting strip two (226), the side wall of the connecting strip two (226) is fixedly connected to a fixing shaft three (227), and the outer wall of the fixing shaft three (227) is movably connected to the auxiliary wheel (228).

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