Trench concrete leveling device

Through hydraulic drive and fan cleaning, water gun dust reduction, and conical wheels adapt to slope driving, the stability and flatness of the ditch concrete leveling device during shoveling are solved, improving work efficiency and protecting the health of staff.

CN222275398UActive Publication Date: 2024-12-31HEILONGJIANG CHENGSHIDA CONSTRUCTION ENGINEERING CO LTD
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Patent Information

Application Number
CN202420857134.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-23
Publication Date
2024-12-31
Estimated Expiration
2034-04-23

AI Technical Summary

Technical Problem

When the existing ditch concrete leveling device shovels, the equipment is unstable due to stones and garbage, resulting in dust and easy deflection, resulting in uneven concrete surface after shoveling.

Method used

A device including hydraulic columns, motors, rotating seats, blade structures, smoothing structures, cleaning structures, regulators, tapered wheels and fans is designed. By hydraulically driving the blade structure to adjust and rotate up and down, negative generation is generated by using the fan. Press and clean up garbage, water pumps and water guns to reduce dust, and adapt to slope driving through regulators and conical wheels to ensure equipment stability and smoothness.

Benefits of technology

It solves the problems of unstable travel of the equipment and dust, improves work efficiency, ensures the flat surface of the concrete, and avoids the impact of equipment offset and dust on personnel health.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The utility model relates to the technical field of hydraulic engineering, and discloses a ditch concrete leveling device which comprises a box body, one side of the box body is fixedly connected with a first hydraulic column, and one side of the first hydraulic column is connected with a motor, the first hydraulic column, a turning wheel and the box body in an inserted mode. The concrete cleaning device is reasonable in structure, negative pressure is generated in the box body through the fan structure, the effects of cleaning garbage on a concrete surface and adsorbing and collecting waste chips after cleaning are achieved, water is sprayed out through the water gun for dust falling operation, the problem that dust generated during cleaning is sucked by workers to affect health of the workers is solved, and the service life of the workers is prolonged. A turning shaft is driven by a fourth motor to enable a turning wheel to rotate, so that the problem that the leveled concrete surface is uneven due to the fact that the running route of the equipment deviates when the equipment is used for leveling the ditch concrete is solved, and the effect that the equipment linearly runs along the slope surface due to the fact that a conical wheel is in contact with the slope surface is achieved; and reduction of working efficiency caused by deviation of a driving route of the device is avoided.
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Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy projects, in particular to a ditch concrete leveling device. Background Art

[0002] A water conservancy project is a project built to control and allocate natural surface water and groundwater to achieve the purpose of eliminating harm and promoting benefits. It is also called a water project. Water is a valuable resource indispensable to human production and life, but its natural state does not fully meet human needs. Only by building water conservancy projects can we control water flow, prevent floods and waterlogging disasters, and regulate and distribute water to meet the people's needs for water resources in life and production.

[0003] A ditch concrete leveling device disclosed in Chinese utility model patent CN211057727U can automatically level the concrete surface, saving manpower and improving work efficiency. However, the existing device does not solve the problem that the equipment is unstable when leveling concrete due to stones and garbage on the concrete surface, dust is easily generated when leveling and cleaning concrete, and the dust is easily inhaled into the lungs of workers, which can cause harm to the workers. The driving route of the equipment deviates during operation, making the concrete surface after leveling uneven. Therefore, we propose a new device to solve the above problems. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a ditch concrete leveling device, which solves the problems of unstable equipment movement caused by stones and garbage on the concrete surface, dust easily generated during equipment operation, and uneven concrete surface caused by deviation of the equipment's travel route.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the utility model is implemented through the following technical solutions: a ditch concrete leveling device, comprising a box body, a first hydraulic column is fixedly connected to one side of the box body, a motor is plugged into one side of the first hydraulic column, a rotating seat is plugged into one side of the motor, a second hydraulic column is plugged into the lower surface of the rotating seat, a scraper structure is plugged into the lower surface of the second hydraulic column, a second motor is plugged into one side of the scraper structure, a grinding structure is plugged into one side of the second motor, a third motor is fixedly connected to one side of the scraper structure, a cleaning structure is plugged into one end of the third motor, a third hydraulic column is fixedly connected to one side of the box body, an adjuster bolt is penetrated through the internal thread of the third hydraulic column, an adjuster is threaded through the third hydraulic column through the adjuster bolt, a conical wheel is plugged into the lower surface of the adjuster, a collector is fixedly connected to one side of the box body, a handrail is fixedly connected to the other side of the box body, and a bottom plate is fixedly connected to the lower surface of the box body.

[0008] Optionally, a water tank is fixedly connected to the interior of the box body, a water pump is plugged into the upper surface of the water tank, a filter is provided at the lower end of the water pump, a water pipe is plugged into the upper end of the water pump, a water gun is plugged into one side of the box body, and one end of the water pipe passes through the box body and is plugged into the water gun.

[0009] Optionally, there is a water pipe on one side of the water gun, and there are two water guns located on both sides of the water pipe.

[0010] Optionally, a battery is clamped on the upper surface of the water tank, and the battery is located in the middle of the upper surface of the water tank, adjacent to the water pump. The upper surface of the water tank is connected to a valve to fill water into the interior.

[0011] Optionally, the upper surface of the box body is clamped with an upper frame of the box body, and the upper frame of the box body can be taken out as a whole. The interior of the upper frame of the box body is slidably connected with a filter plate, and the lower part of the upper frame of the box body has a slot to remove the filter plate. The upper surface of the upper frame of the box body is clamped with two fan structures, and the upper surface of the fan structure has two handles to remove the fan structure.

[0012] Optionally, four grooves are provided on the outside of the box body, a third hydraulic column is provided inside the groove, the adjuster bolt can adjust the angle between the adjuster and the conical wheel, and there are two conical wheels provided on both sides of the adjuster.

[0013] Optionally, the base plate is internally rotatably connected with a direction changer, the lower part of the direction changer passes through the base plate and is plugged with a fourth motor seat, the upper surface of the direction changer is provided with a pin, a plurality of pin holes may be provided inside one side of the base plate, the pins may be inserted into different pin holes to enable the direction-changing shaft to change direction to different degrees, the lower surface of the base plate is provided with a universal wheel, and one end of the direction changer is provided with a deformable armrest.

[0014] Optionally, a fourth motor is plugged into the interior of the fourth motor seat, a changing shaft is sleeved inside the fourth motor, the fourth motor is located in the middle of the changing shaft, changing wheels are sleeved on both sides of the changing shaft, and limiting rings are provided on both sides of the changing shaft to limit the changing wheels.

[0015] In summary, the technical effects and advantages of the utility model are:

[0016] 1. The utility model has a reasonable structure. The motor drives the rotating seat to rotate, and the second hydraulic column is pushed and pulled to adjust the blade structure up and down. The second motor drives the flattening structure to rotate at the rear of the blade structure, so that the concrete plane can be polished. The third motor drives the cleaning structure to rotate on both sides of the blade structure, so that the polished plane can be cleaned. The fan structure generates negative pressure inside the box, so that the garbage enters the inside of the box through the collector and is adsorbed by the filter plate. The rotation of the blade structure can clean the uneven surface of the ditch at different angles, which solves the problem that there are stones on the ground when the equipment moves forward, causing the device to move unsteadily and it is inconvenient for the equipment to flatten the concrete surface of the ditch, and achieves the effect of cleaning the garbage on the concrete surface of the ditch and adsorbing and collecting the cleaned waste, thereby greatly enhancing the work efficiency.

[0017] 2. In the utility model, water in the water tank is pumped into the water gun through a water pump and a water pipe, and the water is sprayed out through the water gun to perform dust reduction operations, thereby solving the problem of dust generated during cleaning being inhaled by workers and affecting their health. The dust generated during cleaning can be reduced by a water gun, thus preventing dust from being inhaled into the lungs of workers.

[0018] 3. In the utility model, the position of the regulator can be adjusted by rotating the regulator bolt, and the conical wheel is plugged into the bottom of the regulator, and the conical wheel rolls on the slope. When the slope is on the right side of the device, the deformable handrail is turned out, and the deformable handrail and the changer are rotated to make the fourth motor seat drive the change-direction shaft to rotate clockwise. After rotating to the appropriate direction, the pin passes through the changer and the pin hole to fix the driving direction of the change-direction wheel. After fixing, the deformable handrail is rotated ninety degrees to reset it, so that the change-direction wheel drives the equipment to move obliquely toward the slope, so that the conical wheel contacts the slope, and the change-direction shaft is driven by the fourth motor to rotate the change-direction wheel, which solves the problem that the equipment's driving route is offset when the equipment is performing ditch concrete leveling operations, resulting in an uneven concrete surface after leveling, and achieves the effect of making the conical wheel contact the slope so that the equipment continues to travel in a straight line along the slope, avoiding the deviation of the route of the device during driving and reducing the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 This is an exploded schematic diagram of the regulator structure of the utility model;

[0021] Figure 3 This is an exploded schematic diagram of the upper frame structure of the box body of the utility model;

[0022] Figure 4 It is an exploded schematic diagram of the structure of the utility model direction changer.

[0023] In the figure: 1. box body; 2. first hydraulic column; 3. motor; 4. rotating seat; 5. second hydraulic column; 6. scraper structure; 7. second motor; 8. grinding structure; 9. third motor; 10. cleaning structure; 11. third hydraulic column; 12. regulator bolt; 13. regulator; 14. conical wheel; 15. collector; 16. handrail; 17. bottom plate; 18. water tank; 19. water pump; 20. water pipe; 21. water gun; 22. battery; 23. box body upper frame; 24. filter plate; 25. fan structure; 26. diverter; 27. fourth motor seat; 28. fourth motor; 29. ​​diverter shaft; 30. diverter wheel. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Example: Reference Figure 1-Figure 4 A ditch concrete leveling device shown in the figure includes a box body 1, a first hydraulic column 2 is fixedly connected to one side of the box body 1, a motor 3 is inserted to one side of the first hydraulic column 2, a rotating seat 4 is inserted to one side of the motor 3, a second hydraulic column 5 is inserted to the lower surface of the rotating seat 4, a blade structure 6 is inserted to the lower surface of the second hydraulic column 5, a second motor 7 is inserted to one side of the blade structure 6, a grinding structure 8 is inserted to one side of the second motor 7, a third motor 9 is fixedly connected to one side of the blade structure 6, a cleaning structure 10 is inserted to one end of the third motor 9, a third hydraulic column 11 is fixedly connected to one side of the box body 1, an adjuster bolt 12 is threaded through the internal thread of the third hydraulic column 11, an adjuster 13 is threaded through the third hydraulic column 11 through the adjuster bolt 12, a conical wheel 14 is inserted to the lower surface of the adjuster 13, a collector 15 is fixedly connected to one side of the box body 1, a handrail 16 is fixedly connected to the other side of the box body 1, and a bottom plate 17 is fixedly connected to the lower surface of the box body 1.

[0026] As a preferred implementation in this embodiment, Figure 2 and Figure 3 As shown, a first hydraulic column 2 is fixedly connected to one side of the box body 1, a motor 3 is plugged into one side of the first hydraulic column 2, a rotating seat 4 is plugged into one side of the motor 3, a second hydraulic column 5 is plugged into the lower surface of the rotating seat 4, a scraper structure 6 is plugged into the lower surface of the second hydraulic column 5, a second motor 7 is plugged into one side of the scraper structure 6, a grinding structure 8 is plugged into one side of the second motor 7, a third motor 9 is fixedly connected to one side of the scraper structure 6, a cleaning structure 10 is plugged into one end of the third motor 9, and a third hydraulic column 11 is fixedly connected to one side of the box body 1. The inner thread of the third hydraulic column 11 is penetrated by an adjuster bolt 12, and the third hydraulic column 11 is threadedly penetrated by an adjuster 13 through the adjuster bolt 12. A conical wheel 14 is inserted on the lower surface of the adjuster 13. Four grooves are provided on the outside of the box body 1, and the third hydraulic column 11 is provided inside the groove. The adjuster bolt 12 can adjust the angle of the adjuster 13 and the conical wheel 14. There are two conical wheels 14 arranged on both sides of the adjuster 13. A collector 15 is fixedly connected to one side of the box body 1, and the upper surface of the box body 1 is clamped with the box body upper frame 2 3. The upper frame 23 of the box body can be taken out as a whole. The filter plate 24 is slidably connected inside the upper frame 23 of the box body. The filter plate 24 can be taken out by a slot at the bottom of the upper frame 23 of the box body. The upper surface of the upper frame 23 of the box body is clamped with two fan structures 25. During use, the first hydraulic column 2 is fixed by the box body 1, and the first hydraulic column 2 is pushed and pulled to adjust up and down. The rotating seat 4 is driven to rotate by the motor 3, and the second hydraulic column 5 is pushed and pulled to adjust the blade structure 6 up and down. The second motor 7 drives the grinding structure 8 to rotate at the rear of the blade structure 6, which can be used to adjust the concrete surface. During grinding, the third motor 9 drives the cleaning structure 10 to rotate on both sides of the blade structure 6 to clean the ground surface. The collector 15 is fixed to one side of the box body 1, and a negative pressure is generated inside the box body 1 through the fan structure 25, so that the garbage enters the box body 1 through the collector 15 and is adsorbed by the filter plate 24, thereby avoiding stones on the ground causing the device to move unsteadily when the equipment moves forward. The blade structure 6 can rotate to clean the uneven surface of the ditch at different angles, thereby saving manpower and material resources and improving work efficiency.

[0027] like Figure 3As shown, in this embodiment, a handrail 16 is fixedly connected to the other side of the box body 1, a bottom plate 17 is fixedly connected to the lower surface of the box body 1, a water tank 18 is fixedly connected to the inside of the box body 1, a water pump 19 is plugged into the upper surface of the water tank 18, a filter is provided at the lower end of the water pump 19, a battery 22 is clamped on the upper surface of the water tank 18, the battery 22 is located in the middle of the upper surface of the water tank 18, adjacent to the water pump 19, a valve is connected to the upper surface of the water tank 18, and water can be injected into the interior, and the water pump 19 is connected to the upper surface of the water tank 18. A water pipe 20 is connected to the upper end, a water gun 21 is connected to one side of the box body 1, one end of the water pipe 20 passes through the box body 1 and is connected to the water gun 21, one side of the water gun 21 is provided with a water pipe, there are two water guns 21, which are located on both sides of the water pipe. During use, the water inside the water tank 18 is pumped into the inside of the water gun 21 through the water pump 19 and the water pipe 20, and the water is sprayed out through the water gun 21 to perform dust reduction operations, thereby avoiding the dust generated during cleaning from being inhaled by the staff and affecting the health of the staff.

[0028] like Figure 2 and Figure 4As shown, in this embodiment, a third hydraulic column 11 is fixedly connected to one side of the box body 1, and an adjuster bolt 12 is penetrated through the internal thread of the third hydraulic column 11. The third hydraulic column 11 is threadedly penetrated with an adjuster 13 through the adjuster bolt 12. A conical wheel 14 is inserted into the lower surface of the adjuster 13. Four grooves are opened on the outside of the box body 1, and the third hydraulic column 11 is arranged inside the groove. The adjuster bolt 12 can adjust the angle of the adjuster 13 and the conical wheel 14. The number of conical wheels 14 is two and they are arranged on both sides of the adjuster 13. The bottom plate 1 The inner part of the bottom plate 17 is connected to the direction changer 26, the lower part of the direction changer 26 penetrates the bottom plate 17 and is plugged with the fourth motor seat 27, the upper surface of the direction changer 26 is provided with a pin, and a plurality of pin holes may be provided inside one side of the bottom plate 17, and the pins inserted into different pin holes can make the direction-changing shaft 29 change to different degrees, the lower surface of the bottom plate 17 is provided with a universal wheel, and one end of the direction changer 26 is provided with a deformable handrail, the inner part of the fourth motor seat 27 is plugged with a fourth motor 28, and the inner part of the fourth motor 28 is sleeved with the direction-changing shaft 29, and the fourth motor 28 is located in the middle of the direction-changing shaft 29 , the two sides of the change-direction shaft 29 are sleeved with change-direction wheels 30, and the two sides of the change-direction shaft 29 are provided with limit rings to limit the change-direction wheels 30. During use, the third hydraulic column 11 is pushed up and down by hydraulic oil on both sides of the box body 1, and the position of the adjuster 13 can be adjusted by rotating the adjuster bolt 12. The adjuster bolt 12 is rotated to fix the third hydraulic column 11 and the adjuster 13. The conical wheel 14 is inserted at the bottom of the adjuster 13, and the conical wheel 14 rolls on the slope. When the slope is on the right side of the device, the deformable handrail is turned out. , by rotating the deformable handrail and the direction changer 26, the fourth motor seat 27 drives the direction-changing shaft 29 to rotate clockwise. After rotating to the appropriate direction, the pin penetrates the direction changer 26 and the pin hole to fix the driving direction of the direction-changing wheel 30. After fixing, the deformable handrail is rotated ninety degrees to reset it, so that the direction-changing wheel 30 drives the equipment to move obliquely toward the slope direction, so that the conical wheel 14 contacts the slope surface, and the fourth motor 28 drives the direction-changing shaft 29 to rotate the direction-changing wheel 30, thereby avoiding the device from deviating from the route during driving and reducing the working efficiency.

[0029] How this utility works:

[0030] During use, the first hydraulic column 2 is fixed by the box body 1, and the first hydraulic column 2 is pushed and pulled to adjust up and down, and the rotating seat 4 is driven to rotate by the motor 3, and the second hydraulic column 5 is pushed and pulled to adjust the blade structure 6 up and down, and the second motor 7 drives the grinding structure 8 to rotate at the rear of the blade structure 6, so as to grind the concrete plane, and the third motor 9 drives the cleaning structure 10 to rotate on both sides of the blade structure 6, so as to clean the ground plane, and the collector 15 is fixed to one side of the box body 1, and the fan structure 25 is used to generate negative pressure inside the box body 1, so that the garbage enters the inside of the box body 1 through the collector 15, and the garbage is adsorbed by the filter plate 24, so as to avoid the unstable movement of the device caused by stones on the ground when the equipment moves forward, and the blade structure 6 can rotate to clean the uneven surface of the ditch at different angles, thereby saving manpower and material resources and improving work efficiency, and the water inside the water tank 18 is pumped into the inside of the water gun 21 through the water pump 19 and the water pipe 20, and the water is sprayed out by the water gun 21 to perform dust reduction operations, so as to avoid In order to prevent the dust generated during cleaning from being inhaled by the staff and affecting their health, the third hydraulic column 11 is pushed by hydraulic oil to adjust up and down on both sides of the box body 1, and the position of the regulator 13 can be adjusted by rotating the regulator bolt 12. The third hydraulic column 11 is fixed to the regulator 13 by rotating the regulator bolt 12. The conical wheel 14 is plugged into the bottom of the regulator 13, and the conical wheel 14 rolls on the slope. When the slope is on the right side of the device, the deformable handrail is turned out, and the fourth motor seat 27 drives the changing shaft 29 to rotate clockwise by rotating the deformable handrail and the changer 26. After rotating to the appropriate direction, the pin penetrates the changer 26 and the pin hole to fix the driving direction of the changing wheel 30. After fixing, the deformable handrail is rotated ninety degrees to reset it, so that the changing wheel 30 drives the equipment to move obliquely toward the slope, so that the conical wheel 14 contacts the slope, and the changing shaft 29 is driven by the fourth motor 28 to rotate the changing wheel 30, thereby avoiding the deviation of the route of the device during driving and reducing the work efficiency.

[0031] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A ditch concrete leveling device, comprising a box (1), characterized in that: A first hydraulic column (2) is fixedly connected to one side of the box body (1), a motor (3) is plugged into one side of the first hydraulic column (2), a rotating seat (4) is plugged into one side of the motor (3), a second hydraulic column (5) is plugged into the lower surface of the rotating seat (4), a scraper structure (6) is plugged into the lower surface of the second hydraulic column (5), a second motor (7) is plugged into one side of the scraper structure (6), a grinding structure (8) is plugged into one side of the second motor (7), a third motor (9) is fixedly connected to one side of the scraper structure (6), and a third motor (9) is plugged into the lower surface of the second motor (7). A cleaning structure (10) is inserted at one end, a third hydraulic column (11) is fixedly connected to one side of the box body (1), an adjuster bolt (12) is passed through the internal thread of the third hydraulic column (11), an adjuster (13) is threadedly passed through the third hydraulic column (11) via the adjuster bolt (12), a conical wheel (14) is inserted at the lower surface of the adjuster (13), a collector (15) is fixedly connected to one side of the box body (1), a handrail (16) is fixedly connected to the other side of the box body (1), and a bottom plate (17) is fixedly connected to the lower surface of the box body (1).

2. A ditch concrete leveling device according to claim 1, characterized in that: A water tank (18) is fixedly connected to the interior of the box body (1), a water pump (19) is plugged into the upper surface of the water tank (18), a filter screen is provided at the lower end of the water pump (19), a water pipe (20) is plugged into the upper end of the water pump (19), a water gun (21) is plugged into one side of the box body (1), and one end of the water pipe (20) passes through the box body (1) and is plugged into the water gun (21).

3. A ditch concrete leveling device according to claim 2, characterized in that: A water pipe is provided on one side of the water gun (21), and there are two water guns (21) located on both sides of the water pipe.

4. A ditch concrete leveling device according to claim 2, characterized in that: A storage battery (22) is clamped on the upper surface of the water tank (18). The storage battery (22) is located in the middle of the upper surface of the water tank (18) and is adjacent to the water pump (19). The upper surface of the water tank (18) is connected to a valve for filling water into the interior.

5. A ditch concrete leveling device according to claim 1, characterized in that: The upper surface of the box body (1) is snap-connected with a box body upper frame (23), and the box body upper frame (23) can be removed as a whole. The interior of the box body upper frame (23) is slidably connected with a filter plate (24), and a slot is provided at the lower part of the box body upper frame (23) for removing the filter plate (24). The upper surface of the box body upper frame (23) is snap-connected with two fan structures (25), and the upper surface of the fan structure (25) is provided with two handles for removing the fan structure (25).

6. A ditch concrete leveling device according to claim 1, characterized in that: The box body (1) is provided with four grooves on the outside, and a third hydraulic column (11) is provided inside the grooves. The adjuster bolt (12) can adjust the angle of the adjuster (13) and the conical wheel (14). The conical wheels (14) are provided in two on both sides of the adjuster (13).

7. A ditch concrete leveling device according to claim 1, characterized in that: The bottom plate (17) is internally rotatably connected with a direction changer (26), the lower part of which penetrates the bottom plate (17) and is plugged with a fourth motor seat (27), the upper surface of the direction changer (26) is provided with a latch, a plurality of pin holes may be provided inside one side of the bottom plate (17), the latch being inserted into different pin holes to enable the direction-changing shaft (29) to change direction to different degrees, the lower surface of the bottom plate (17) is provided with a universal wheel, and one end of the direction changer (26) is provided with a deformable handrail.

8. A ditch concrete leveling device according to claim 7, characterized in that: A fourth motor (28) is inserted into the interior of the fourth motor seat (27), a direction-changing shaft (29) is sleeved into the interior of the fourth motor (28), the fourth motor (28) is located in the middle of the direction-changing shaft (29), direction-changing wheels (30) are sleeved on both sides of the direction-changing shaft (29), and limiting rings are provided on both sides of the direction-changing shaft (29) to limit the direction-changing wheels (30).