A vision-based overhead cable inspection vehicle

Abstract

A vision-based overhead cable inspection vehicle. Relates to the field of overhead cable inspection equipment. A vision-based overhead cable inspection vehicle with a sophisticated structure, simple operation, good motion stability and long service life is proposed. When in use, it can carry a video shooting device to conduct efficient inspections of overhead cables and can effectively avoid being entangled by debris on the overhead cables. The vision-based overhead cable inspection vehicle is characterized in that it includes a chassis and a walking mechanism, and a camera for shooting the outer layer of the cable is fixedly connected to the side of the chassis facing the forward direction; the rotating shaft is detachably connected to the walking wheel through an anti-winding component; the anti-winding component includes an inner nut, an inner plane bearing, an outer plane bearing and an outer nut. On the whole, it has the advantages of sophisticated structure, simple operation, good motion stability and long service life.

Description

Technical Field

[0001] The invention relates to the field of overhead cable inspection equipment. Background Art

[0002] In recent years, with the construction of high-voltage line backbone networks, more and more high-voltage transmission lines have been put into operation, and operational defects have gradually been exposed. For example, the outer strands of OPGW optical fiber composite overhead ground wires are frequently broken. This kind of outer strand breakage not only threatens communication security, but also poses a serious threat to the safety of transmission lines as the length of the strands increases and the mechanical strength of the line decreases. According to the investigation and statistics on the broken strands of transmission lines, the broken strands are generally the outer monofilaments. Therefore, the inspection of the broken strands of transmission lines can be carried out by video image inspection.

[0003] At present, the commonly used inspection method is the manual inspection method, which has a large workload, harsh conditions, and low inspection accuracy. In particular, there are great difficulties in the inspection of mountainous areas and lines across large rivers. Some inspection projects are even difficult to complete by conventional methods. In order to achieve the purpose of comprehensive inspection, the inspection method of helicopter aerial survey has emerged, which has high accuracy and efficiency. However, due to the influence of geographical and climatic conditions in the inspection area, there are safety hazards and high line inspection costs. In addition, there are also inspection equipment that walks directly on the transmission line for inspection, but there are generally shortcomings such as weak obstacle crossing ability and poor endurance. In particular, the debris on the overhead cables (kite line, cotton line, fishing line, etc.) will be entangled on the walking wheels of the inspection equipment as the inspection equipment walks, which has a great impact on the normal use of the inspection equipment.

[0004] Therefore, technical personnel in this field need to research and develop a walking device that can walk on the line to inspect the line operation status, has no blind spots, has high precision, high efficiency, strong obstacle-crossing ability, strong endurance, and relatively low cost, so as to promptly detect broken strand damage of the transmission line, effectively avoid accidents caused by broken strand damage of the transmission line, and ensure the safe operation of the power system communication. Summary of the invention

[0005] In view of the above problems, the present invention proposes a vision-based overhead cable inspection vehicle which has a sophisticated structure, simple operation, good motion stability and a long service life. When in use, the vehicle can carry a video shooting device to efficiently inspect overhead cables and can effectively avoid being entangled by debris on the overhead cables.

[0006] The technical solution of the present invention is: a vision-based overhead cable inspection vehicle, characterized in that it includes a chassis and a walking mechanism, and a camera for photographing the outer layer of the cable is fixedly connected to one side of the chassis facing the forward direction;

[0007] The walking mechanism includes a fixed seat, a motor, a transmission assembly, a pair of rotating shafts and four walking wheels. The fixed seat is fixedly connected to the top surface of the chassis, the motor is fixedly connected inside the chassis, the pair of rotating shafts are parallel to each other and have equal heights, the rotating shafts are passed through the upper part of the fixed seat, and both ends thereof extend out of the fixed seat, the four walking wheels are detachably connected to the ends of the two rotating shafts, and the motor drives the two rotating shafts to rotate around their own axes at the same time through the transmission assembly;

[0008] The rotating shaft is detachably connected to the traveling wheel via an anti-winding assembly;

[0009] The anti-winding component includes an inner nut, an inner plane bearing, an outer plane bearing and an outer nut. The rotating shaft is provided with a thread. The inner plane bearing is sleeved on the rotating shaft and is located in a fixed seat. The inner nut is connected to the rotating shaft through a thread, and the inner plane bearing is pressed against the inner wall of the fixed seat through the inner nut; the outer plane bearing, the walking wheel and the outer nut are sleeved on the end of the rotating shaft extending out of the fixed seat in sequence, and the outer nut is threadedly connected to the rotating shaft, so that the outer plane bearing is pressed against the outer wall of the fixed seat through the outer nut, and the walking wheel and the rotating shaft keep rotating synchronously.

[0010] An inner anti-rotation nut is also provided on the side of the inner nut facing away from the inner plane bearing, and the inner anti-rotation nut is threadedly connected to the rotating shaft and fits with the inner nut;

[0011] An outer anti-rotation nut is also provided on the side of the outer nut facing away from the traveling wheel. The outer anti-rotation nut is threadedly connected to the rotating shaft and fits with the outer nut.

[0012] At least one gasket is arranged between the outer plane bearing and the outer wall of the fixing seat.

[0013] The transmission assembly includes a transmission shaft 1, a pinion, a belt 1 and a pair of large gears. The two ends of the transmission shaft 1 are hinged in a fixed seat and are parallel to a pair of rotating shafts. The output shaft of the motor is parallel to the transmission shaft 1 and is located below the transmission shaft 1. The output shaft of the motor and the transmission shaft 1 are kept in linkage through a belt 1. The pinion is fixedly connected to the transmission shaft 1 and is coaxial with the transmission shaft. The pair of large gears are respectively fixedly connected to a pair of rotating shafts and are respectively coaxial with the pair of rotating shafts. The pinion is between the pair of large gears, and the two sides of the pinion are respectively meshed with the two large gears.

[0014] The walking mechanism also includes an obstacle-crossing mechanism, which includes a rotating shaft, a power transmission component, a pair of obstacle-crossing wheels, a pair of sliders and a pair of springs. A pair of vertically arranged sliding holes are opened on both sides of the fixing seat, and the pair of sliders are respectively slidably connected in the sliding holes. The spring is vertically arranged, and the two ends of the spring are respectively fixedly connected between the bottom of the slider and the bottom of the sliding hole;

[0015] The sliders are passed through the two ends of the rotating shaft, and the two obstacle-crossing wheels are detachably connected to the two side ends of the rotating shaft extending out of the fixed seat and are located below the running wheels;

[0016] The power transmission assembly is connected between the output shaft and the rotating shaft of the motor, so that the output shaft and the rotating shaft of the motor keep rotating synchronously.

[0017] A plane bearing is provided between the obstacle crossing wheel and the slider, and a pair of fastening nuts are provided on the side of the obstacle crossing wheel away from the fixed seat. The pair of fastening nuts are connected to the rotating shaft through threads, and the pair of fastening nuts fit each other, and the plane bearing is pressed against the surface of the slider through the pair of fastening nuts, so that the obstacle crossing wheel and the rotating shaft keep rotating synchronously.

[0018] The power transmission assembly includes a second transmission shaft, a second belt, a second connecting rod, a third belt, and a third connecting rod. The second transmission shaft is located between the output shaft of the motor and the rotating shaft and is parallel to the two. One end of the second connecting rod is hinged to the output shaft of the motor, and the other end is hinged to the second transmission shaft. One end of the third connecting rod is hinged to the rotating shaft, and the other end is hinged to the second transmission shaft. The output shaft of the motor and the second transmission shaft are linked by a second belt, and the second transmission shaft and the rotating shaft are linked by a third belt.

[0019] When the present invention is used, it can be arranged between two adjacent overhead cables, and the four walking wheels on both sides of the fixed seat can be mounted on the two adjacent overhead cables. After that, the motor can be remotely controlled to run while keeping the camera turned on (the specific implementation method of the remote control motor belongs to the conventional technical means in the prior art, so it will not be repeated in this case), so that the four walking wheels are driven to rotate under the action of the transmission component, and then the inspection vehicle can walk on the overhead cables. And through the added anti-winding component, the purpose of carrying video shooting equipment to carry out efficient inspection of overhead cables and effectively avoid being entangled by debris on the overhead cables is achieved. Overall, it has the advantages of exquisite structure, simple operation, good motion stability and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the implementation method of this case;

[0021] Figure 2 This is the structural diagram of this case.

[0022] Figure 3 yes Figure 2 A top view of

[0023] Figure 4 yes Figure 2 AA section view,

[0024] Figure 5 yes Figure 3 DD section view,

[0025] Figure 6 yes Figure 2 BB section view,

[0026] Figure 7 yes Figure 3 CC section view;

[0027] In the figure, 1 is a chassis, and 10 is a camera;

[0028] 2 is a walking mechanism, 21 is a fixed seat, 22 is a motor, 23 is a transmission assembly, 231 is a transmission shaft 1, 232 is a small gear, 233 is a belt 1, 234 is a large gear, 24 is a rotating shaft, and 25 is a walking wheel;

[0029] 261 is an inner nut, 262 is an inner plane bearing, 263 is an outer plane bearing, 264 is an outer nut, 265 is an inner anti-rotation nut, 266 is an outer anti-rotation nut, and 267 is a gasket;

[0030] 3 is an obstacle-crossing mechanism, 31 is a rotating shaft, 32 is a power transmission component, 321 is a transmission shaft 2, 322 is a belt 2, 323 is a connecting rod 2, 324 is a belt 3, 325 is a connecting rod 3, 33 is an obstacle-crossing wheel, 331 is a plane bearing, 332 is a fastening nut, 34 is a slider, and 35 is a spring. DETAILED DESCRIPTION

[0031] In order to clearly illustrate the technical features of this patent, this patent is elaborated in detail below through a specific implementation method and in combination with its accompanying drawings.

[0032] The present invention Figure 1-7 As shown, it includes a chassis 1 and a running mechanism 2, through which the battery, signal transmission equipment, data storage equipment, etc. are accommodated, and can be Figure 1 As shown, a camera 10 for photographing the outer layer of the cable is fixedly connected to one side of the chassis 1 facing the forward direction, so as to judge whether there are problems such as single-wire breakage in the future; the signal transmission, operation control, arrangement of wires or signal lines of the camera recorded in this case are all conventional technical means in the prior art, and are not the technical solutions to be protected in this case, and have nothing to do with the technical problems to be solved in this case. Therefore, this case will not be repeated;

[0033] The walking mechanism 2 includes a fixed seat 21, a motor 22, a transmission assembly 23, a pair of rotating shafts 24 and four walking wheels 25. The fixed seat 21 is fixedly connected to the top surface of the chassis 1, the motor 22 is fixedly connected inside the chassis 1, the pair of rotating shafts 24 are parallel to each other and have equal heights, the rotating shafts 24 are penetrated through the upper part of the fixed seat 21, and both ends thereof extend out of the fixed seat 21, the four walking wheels 25 are respectively detachably connected to the ends of the two rotating shafts 24, and the motor 22 simultaneously drives the two rotating shafts 24 to rotate around their own axes through the transmission assembly 23;

[0034] The rotating shaft 24 is detachably connected to the running wheel 25 through an anti-winding assembly;

[0035] The anti-winding component includes an inner nut 261, an inner plane bearing 262, an outer plane bearing 263 and an outer nut 264. The rotating shaft 24 is provided with threads. The inner plane bearing 262 is sleeved on the rotating shaft 24 and is located in the fixed seat 21. The inner nut 261 is connected to the rotating shaft 24 by threads, and the inner plane bearing 262 is pressed against the inner wall of the fixed seat 21 by the inner nut 261; the outer plane bearing 263, the walking wheel 25, and the outer nut 264 are sequentially sleeved on the end of the rotating shaft 24 extending out of the fixed seat 21, and the outer nut 264 is threadedly connected to the rotating shaft 24, so that the outer plane bearing 263 is pressed against the outer wall of the fixed seat 21 by the outer nut 264, and the walking wheel 25 and the rotating shaft 24 keep rotating synchronously. In this way, while the traveling wheel and the rotating shaft can smoothly rotate synchronously relative to the fixed seat, the anti-winding component can effectively fill the gap between the traveling wheel and the fixed seat, and block the gap between the rotating shaft and the fixed seat, thereby effectively avoiding the possibility of debris on the overhead cable being entangled on the rotating shaft, and avoiding equipment jamming during operation.

[0036] When the present invention is used, it can be arranged between two adjacent overhead cables, and the four walking wheels on both sides of the fixed seat can be mounted on the two adjacent overhead cables. After that, the motor can be remotely controlled to run while keeping the camera turned on (the specific implementation method of the remote control motor belongs to the conventional technical means in the prior art, so it will not be repeated in this case), so that the four walking wheels are driven to rotate under the action of the transmission component, and then the inspection vehicle can walk on the overhead cables. And through the added anti-winding component, the purpose of carrying video shooting equipment to carry out efficient inspection of overhead cables and effectively avoid being entangled by debris on the overhead cables is achieved. Overall, it has the advantages of exquisite structure, simple operation, good motion stability and long service life.

[0037] An inner anti-rotation nut 264 is also provided on the side of the inner nut 261 facing away from the inner plane bearing. The inner anti-rotation nut 265 is threadedly connected to the rotating shaft 24 and fits with the inner nut 261, thereby playing a good anti-rotation role for the inner nut.

[0038] The outer nut 264 is further provided with an outer anti-rotation nut 266 on the side facing away from the travel wheel, and the outer anti-rotation nut 266 is threadedly connected to the rotating shaft 24 and fits with the outer nut 264, thereby playing a good anti-rotation role on the outer nut.

[0039] At least one gasket 267 is also provided between the outer plane bearing 263 and the outer wall of the fixing seat 21. Thus, the spacing between the two running wheels on the same rotating shaft can be appropriately adjusted according to the spacing between adjacent cables, so that the inspection vehicle can travel on the overhead cables better and more smoothly.

[0040] like Figure 4-5 As shown, the transmission assembly 23 includes a transmission shaft 231, a pinion 232, a belt 233 and a pair of large gears 234. Both ends of the transmission shaft 231 are hinged in the fixed seat 21 and are parallel to the pair of rotating shafts 24. The output shaft of the motor 22 is parallel to the transmission shaft 231 and is located below the transmission shaft 231. The output shaft of the motor 22 and the transmission shaft 231 are kept in linkage through the belt 233. The pinion 232 is fixedly connected to the transmission shaft 231 and is coaxial with the transmission shaft 231. The pair of large gears 234 are respectively fixedly connected to the pair of rotating shafts 24 and are respectively coaxial with the pair of rotating shafts 24. The pinion 232 is between the pair of large gears 234, and the two sides of the pinion 232 are respectively meshed with the two large gears 234. In this way, after the motor is turned on, the rotation of its output shaft will drive the transmission shaft to rotate, thereby driving a pair of rotating shafts to rotate under the transmission of the small gear and the large gear, thereby realizing the walking of the inspection vehicle on the overhead cables.

[0041] In actual use, people also found that in many cases, the inspection equipment needs to have the ability to cross or climb over obstacles for debris on overhead cables. Therefore, the following improvements were made in this case:

[0042] The walking mechanism also includes an obstacle-crossing mechanism 3, which includes a rotating shaft 31, a power transmission component 32, a pair of obstacle-crossing wheels 33, a pair of sliders 34 and a pair of springs 35. A pair of vertically arranged sliding holes are provided on both sides of the fixed seat 21, and a pair of the sliders 34 are respectively slidably connected in the sliding holes. The surfaces of the sliders on both sides are provided with card grooves adapted to the wall thickness of the fixed seat, so that the sliders can and can only make a linear relative movement in the vertical direction with the fixed seat. The spring 35 is vertically arranged, and the two ends of the spring 35 are respectively fixedly connected between the bottom of the slider 34 and the bottom of the sliding hole;

[0043] The sliders 34 are passed through the two ends of the rotating shaft 31, and the two obstacle-crossing wheels 33 are detachably connected to the two side ends of the rotating shaft 31 extending out of the fixed seat 21 and are located below the walking wheel 25;

[0044] The power transmission assembly 32 is connected between the output shaft of the motor 22 and the rotating shaft 31, so that the output shaft of the motor 22 and the rotating shaft 31 keep rotating synchronously. In this way, after the motor is turned on, the rotational movement of its output shaft will drive the rotating shaft to rotate, thereby driving a pair of obstacle-crossing wheels to rotate. Due to the presence of the spring, the obstacle-crossing wheels will fit the bottom of the cable under normal conditions, and when encountering debris or obstacles, the obstacle-crossing wheels can move downward relative to the running wheels, so that enough space is left between the obstacle-crossing wheels and the running wheels for debris to pass through. Finally, the obstacle-crossing ability of the inspection vehicle is significantly improved, so that this case can have a better practical use effect.

[0045] A plane bearing 331 is provided between the obstacle-crossing wheel 33 and the slider, and a pair of fastening nuts 332 are provided on the side of the obstacle-crossing wheel 33 away from the fixed seat 21. The pair of fastening nuts 332 are connected to the rotating shaft 31 through threads, and the pair of fastening nuts 332 fit each other, and the plane bearing 331 is pressed against the surface of the slider 34 through the pair of fastening nuts 332, so that the obstacle-crossing wheel 33 and the rotating shaft 31 can keep rotating synchronously. In this way, while smoothly realizing the synchronous rotation of the obstacle-crossing wheel and the rotating shaft relative to the fixed seat, the arrangement of the plane bearing and the fastening nut effectively fills the gap between the obstacle-crossing wheel and the slider, and blocks the gap between the rotating shaft and the slider, thereby effectively avoiding the possibility of debris on the overhead cable being entangled on the rotating shaft, and avoiding the phenomenon of equipment jamming during operation.

[0046] In order to adjust the distance between a pair of obstacle-crossing wheels, a thickened gasket sleeved on the rotating shaft can be appropriately arranged between the plane bearing and the slider.

[0047] In order to maintain the continuity of power transmission between the output shaft and the rotating shaft of the motor and prevent the inspection vehicle from being lifted up by debris, the following improvements were made to the power transmission mechanism in this case:

[0048] The power transmission assembly 32 includes a second transmission shaft 321, a second belt 322, a second connecting rod 323, a third belt 324, and a third connecting rod 325. The second transmission shaft 321 is located between the output shaft of the motor 22 and the rotating shaft 31 and is parallel to the two. One end of the second connecting rod 323 is hinged to the output shaft of the motor 22, and the other end is hinged to the second transmission shaft 321. One end of the third connecting rod 325 is hinged to the rotating shaft 31, and the other end is hinged to the second transmission shaft 321.

[0049] The output shaft of the motor 22 and the second transmission shaft 321 are linked by a second belt 322, and the second transmission shaft 321 and the rotating shaft 31 are linked by a third belt 324. The specific transmission ratios between the three can be as follows: Figure 6-7 As shown, the transmission ratio can be controlled by controlling the size of the pulley as needed. In this way, due to the existence of connecting rod 2 and belt 2, the output shaft of the motor and the transmission shaft 2 will maintain stable power transmission; and due to the existence of connecting rod 3 and belt 3, the transmission shaft 2 and the rotating shaft will also maintain stable power transmission; in this way, even if the inspection car is in the process of overcoming obstacles, the continuity of power transmission between the output shaft of the motor and the rotating shaft can be effectively guaranteed to prevent the inspection car from being lifted by debris.

[0050] In order to make the action of the power transmission component more stable, the present invention also makes the following optimizations to the power transmission component 32;

[0051] The power transmission assembly 32 further includes an elastic pull rope, one end of which is fixedly connected to the top of the second connecting rod 323, and the other end of which is fixedly connected to the top of the inner wall of the chassis 1. Thus, the elastic pull rope "pulls" the top of the second connecting rod, so that the power transmission assembly maintains better movement stability.

[0052] At least one arc-shaped slide groove is provided on the side wall of the chassis 1, and the center line of the arc-shaped slide groove takes the axis of the motor as the center of the circle. The end of the second transmission shaft 321 is inserted into the arc-shaped slide groove and can slide back and forth along the arc-shaped slide groove driven by the up and down movement of the obstacle-crossing wheel 33, so that the movement of the second transmission shaft is more stable.

[0053] There are many specific implementation ways of the present invention. The above is only the preferred implementation mode of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principle of the present invention. These improvements should also be regarded as the protection scope of the present invention.

Claims

1. A vision-based overhead cable inspection vehicle, characterized in that: It comprises a chassis and a walking mechanism, wherein a camera for photographing the outer layer of the cable is fixedly connected to one side of the chassis facing the forward direction; The walking mechanism includes a fixed seat, a motor, a transmission assembly, a pair of rotating shafts and four walking wheels. The fixed seat is fixedly connected to the top surface of the chassis, the motor is fixedly connected inside the chassis, the pair of rotating shafts are parallel to each other and have equal heights, the rotating shafts are passed through the upper part of the fixed seat, and both ends thereof extend out of the fixed seat, the four walking wheels are detachably connected to the ends of the two rotating shafts, and the motor drives the two rotating shafts to rotate around their own axes at the same time through the transmission assembly; The rotating shaft is detachably connected to the traveling wheel via an anti-winding assembly; The anti-winding assembly includes an inner nut, an inner plane bearing, an outer plane bearing and an outer nut. The rotating shaft is provided with threads. The inner plane bearing is sleeved on the rotating shaft and is located in a fixed seat. The inner nut is connected to the rotating shaft through threads, and the inner plane bearing is pressed against the inner wall of the fixed seat through the inner nut; the outer plane bearing, the walking wheel and the outer nut are sleeved on the end of the rotating shaft extending out of the fixed seat in sequence, and the outer nut is threadedly connected to the rotating shaft, so that the outer plane bearing is pressed against the outer wall of the fixed seat through the outer nut, and the walking wheel and the rotating shaft keep rotating synchronously; An inner anti-rotation nut is also provided on the side of the inner nut facing away from the inner plane bearing, and the inner anti-rotation nut is threadedly connected to the rotating shaft and fits with the inner nut; An outer anti-rotation nut is also provided on the side of the outer nut facing away from the traveling wheel, and the outer anti-rotation nut is threadedly connected to the rotating shaft and fits with the outer nut; The transmission assembly includes a transmission shaft 1, a pinion, a belt 1 and a pair of large gears. The two ends of the transmission shaft 1 are hinged in a fixed seat and are parallel to the pair of rotating shafts. The output shaft of the motor is parallel to the transmission shaft 1 and is located below the transmission shaft 1. The output shaft of the motor and the transmission shaft 1 are kept in linkage through a belt 1. The pinion is fixedly connected to the transmission shaft 1 and is coaxial with the transmission shaft. The pair of large gears are respectively fixedly connected to a pair of rotating shafts and are coaxial with the pair of rotating shafts. The pinion is between the pair of large gears, and the two sides of the pinion are respectively meshed with the two large gears. The walking mechanism also includes an obstacle-crossing mechanism, which includes a rotating shaft, a power transmission component, a pair of obstacle-crossing wheels, a pair of sliders and a pair of springs. A pair of vertically arranged sliding holes are opened on both sides of the fixing seat, and the pair of sliders are respectively slidably connected in the sliding holes. The spring is vertically arranged, and the two ends of the spring are respectively fixedly connected between the bottom of the slider and the bottom of the sliding hole; The sliders are passed through the two ends of the rotating shaft, and the two obstacle-crossing wheels are detachably connected to the two side ends of the rotating shaft extending out of the fixed seat and are located below the running wheels; The power transmission assembly is connected between the output shaft and the rotating shaft of the motor, so that the output shaft and the rotating shaft of the motor keep rotating synchronously.

2. The vision-based overhead cable inspection vehicle according to claim 1 is characterized in that: At least one gasket is arranged between the outer plane bearing and the outer wall of the fixing seat.

3. The vision-based overhead cable inspection vehicle according to claim 1 is characterized in that: A plane bearing is provided between the obstacle crossing wheel and the slider, and a pair of fastening nuts are provided on the side of the obstacle crossing wheel away from the fixed seat. The pair of fastening nuts are connected to the rotating shaft through threads, and the pair of fastening nuts fit each other, and the plane bearing is pressed against the surface of the slider through the pair of fastening nuts, so that the obstacle crossing wheel and the rotating shaft keep rotating synchronously.

4. The vision-based overhead cable inspection vehicle according to claim 1 is characterized in that: The power transmission assembly includes a second transmission shaft, a second belt, a second connecting rod, a third belt, and a third connecting rod. The second transmission shaft is located between the output shaft of the motor and the rotating shaft and is parallel to the two. One end of the second connecting rod is hinged to the output shaft of the motor and the other end is hinged to the second transmission shaft. One end of the third connecting rod is hinged to the rotating shaft and the other end is hinged to the second transmission shaft. The output shaft of the motor and the second transmission shaft are linked via a second belt, and the second transmission shaft and the rotating shaft are linked via a third belt.

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