Novel photovoltaic panel cleaning tool

By designing a new photovoltaic panel cleaning tool including a main drive device, a secondary drive device and telescopic tube, the second motor and electromagnetic device are used to realize the movement of magnetic steel and cleaning device, the problem of difficulty in cleaning existing tools on the inclined photovoltaic panel is solved, and a fast and safe cleaning effect is achieved.

CN119945304APending Publication Date: 2025-05-06JIYANG POWER SUPPLY CO STATE GRID SHANDONG ELECTRIC POWER CO
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Patent Information

Application Number
CN202510120053.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-25
Publication Date
2025-05-06

AI Technical Summary

Technical Problem

When existing photovoltaic panel cleaning tools deal with photovoltaic panels with large inclination angles, it is difficult to walk normally by cleaning robots, and it is difficult to install, and the operators have high labor intensity and danger.

Method used

A new type of photovoltaic panel cleaning tool is designed, including a main drive device, a secondary drive device and a telescopic tube. The second motor drives the coiling roller to wind the traction rope, controls the movement of magnetic steel up and down in the telescopic tube, and realizes the radial cleaning of the cleaning device with the electromagnetic device.

Benefits of technology

It realizes rapid and safe cleaning on inclined photovoltaic panels, reduces the labor intensity and danger of operators, and improves the uniformity and thoroughness of cleaning.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of photovoltaic panel cleaning equipment, in particular to a novel photovoltaic panel cleaning tool which comprises a main driving device and an auxiliary driving device, a telescopic pipe is connected between the main driving device and the auxiliary driving device, the telescopic pipe comprises an outer pipe and an inner pipe, a sliding groove is formed in the outer pipe, and the sliding groove is communicated with the main driving device and the auxiliary driving device. A sliding groove is formed in the outer pipe, a plurality of limiting grooves are formed in the outer pipe along the sliding groove array, the inner pipe is arranged in the outer pipe in a sleeved mode, limiting blocks matched with the sliding groove and the limiting grooves are arranged outside the end, close to the main driving device, of the inner pipe, a second motor is arranged in the main driving device, and a winding roller is installed at the power output end of the second motor. A traction rope is wound on the winding roller, magnetic steel capable of sliding along the interiors of the outer pipe and the inner pipe is installed at one end of the traction rope, the telescopic pipe is sleeved with a sweeping device, the sweeping device comprises an electromagnetic device, and the electromagnetic device can be matched with the magnetic steel.
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Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic panel cleaning equipment, and in particular to a novel photovoltaic panel cleaning tool. Background Art

[0002] In the process of cleaning photovoltaic panels on rural roofs, traditional cleaning methods usually rely on manual operation. Manual cleaning of photovoltaic panels requires operators to operate on the sloping roof, which is not only labor-intensive, but also has certain safety risks. Not only is the cleaning speed slow, it is difficult to quickly complete the cleaning of large-area photovoltaic panels, but it is also difficult to ensure the uniformity and thoroughness of cleaning, which may lead to incomplete cleaning in some areas.

[0003] Existing cleaning tools include photovoltaic panel cleaning robots, which can walk on the surface of photovoltaic panels via tracks. However, for areas where photovoltaic panels are installed at a large inclination angle (for example, at 39.9° north latitude in Beijing, PVsyst simulation found that its optimal inclination angle is about 39°), the cleaning robot needs to drag a water pipe, which causes the cleaning robot to be unable to walk normally on the surface of the photovoltaic panel, and there is also a risk of falling; existing cleaning tools also include hanging cleaning devices, which are large in size as a whole. For photovoltaic panels with limited operating space reserved on the roof, the installation of the cleaning device is difficult. Although the cleaning speed is fast, the installation takes a lot of time, and the components are large and heavy, which increases the time difficulty for operators; existing cleaning devices also include cleaning devices that need to be held by operators, which is not convenient for operators to use in local areas with limited operating space on the roof, and will increase the labor intensity and danger of operators. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a novel photovoltaic panel cleaning tool to solve the problems existing in the above-mentioned background technology.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] A novel photovoltaic panel cleaning tool comprises a main drive device and an auxiliary drive device, wherein a telescopic tube is connected between the main drive device and the auxiliary drive device, wherein the telescopic tube comprises an outer tube and an inner tube, wherein a slide groove is provided inside the outer tube, wherein a plurality of limit grooves are provided inside the outer tube along the slide groove array, wherein the inner tube is sleeved inside the outer appearance, and a limit block matching the slide groove and the limit groove is provided outside the end of the inner tube close to the main drive device, wherein a second motor is provided inside the main drive device, and a winding roller is installed at the power output end of the second motor, wherein a traction rope is wound around the winding roller, and one end of the traction rope is installed with magnetic steel capable of sliding along the inner tube and the outer tube, wherein a cleaning device is sleeved on the telescopic tube, and wherein the cleaning device comprises an electromagnetic device, and wherein the electromagnetic device can cooperate with the magnetic steel.

[0007] Preferably, a first motor is arranged on the top of the main drive device, a main drive wheel is installed on the power output end of the first motor, the main drive wheel is arranged at the bottom of the main drive device, the main drive wheel can abut against the side of the photovoltaic panel, a main auxiliary wheel that can abut against the upper surface of the photovoltaic panel is also installed on the bottom side of the main drive device, a water spray chamber is arranged inside the side of the main drive device close to the photovoltaic panel, a water spray hole is opened on the side of the water spray chamber close to the photovoltaic panel, and a water pipe that can be connected to an external water supply device is arranged on the side of the water spray chamber away from the water spray hole.

[0008] Preferably, a fourth motor is arranged on the top of the auxiliary driving device, and an auxiliary driving wheel capable of abutting against the side of the photovoltaic panel is installed at the power output end of the fourth motor, and an auxiliary auxiliary wheel capable of abutting against the upper surface of the photovoltaic panel is also arranged at the bottom of the auxiliary driving device.

[0009] Preferably, the cleaning device also includes a third motor, which is connected to the electromagnetic device via a connecting block, and a cleaning disc is installed at the power output end of the third motor. The bottom of the cleaning disc is provided with bristles that can abut against the upper surface of the photovoltaic panel.

[0010] Preferably, the electromagnetic device comprises a sliding seat having a through hole inside, the sliding seat being mounted on the telescopic rod through the through hole, an electromagnetic coil being arranged inside the sliding seat, and a power source for providing energy to the electromagnetic coil being arranged on the top of the sliding seat.

[0011] Preferably, the telescopic tube is made of non-metallic material, both ends of the through hole of the sliding seat are provided with conical grooves, and the end of the inner tube close to the main driving device is provided with a conical groove inside.

[0012] Preferably, a connecting rod is provided at one end of the inner tube close to the auxiliary driving device, a through hole is provided inside the auxiliary driving device, the auxiliary driving device is sleeved on the connecting rod, and a limiting ring is installed at one end of the connecting rod away from the inner tube through a thread.

[0013] The beneficial effects of the embodiments of the present invention are:

[0014] 1. Since the main driving device of the device is provided with a second motor inside, the second motor can drive the winding roller to wind up the traction rope, so as to control the magnetic steel to move up and down in the telescopic tube, and the electromagnetic device on the cleaning device can work and cooperate with the magnetic steel. When the magnetic steel is adsorbed by the electromagnetic device, the cleaning device can be driven by the second motor to move up and down along the photovoltaic panel, so as to facilitate the cleaning device to radially clean the photovoltaic panel. When the second motor stops working, under the dead weight of the cleaning device, the cleaning device can drive the magnetic steel and the traction rope to move downward where the photovoltaic panel is inclined and perform cleaning work. By reciprocatingly cleaning a radial plane that can be covered by the cleaning device, the cleaning effect is ensured, and the device can be quickly disassembled, so as to facilitate the operator to quickly transport and install the device, and the device can control the cleaning through a controller, so as to reduce the labor intensity of the operator and reduce the danger of the operator performing cleaning work on the roof.

[0015] 2. The main drive device, the auxiliary drive device and the telescopic tube of the device can be detachably connected, so that the operator can transport the device to the roof separately after separation, and then connect the main drive device and the telescopic tube, so that the operator can extend the telescopic tube to a suitable length, and then push the main drive device to the top of the inclined photovoltaic panel with a higher horizontal height, ensuring that the main drive wheel abuts against the top side of the photovoltaic panel, and the main auxiliary wheel abuts against the inclined surface of the photovoltaic panel. The slide groove inside the outer tube facilitates the limit block at the end of the inner tube to slide in the slide groove. After ensuring that the length of the telescopic tube meets the requirements, the inner tube is screwed so that the limit block at the end of the inner tube is engaged with the limit groove at the corresponding position to ensure that the telescopic tube will not be extended or retracted, and then the cleaning device is installed on the telescopic tube, and the auxiliary drive device is subsequently rotated at the bottom of the telescopic tube, ensuring that the auxiliary drive wheel abuts against the bottom side of the photovoltaic panel, and ensuring that the auxiliary auxiliary wheel abuts against the inclined surface of the photovoltaic panel, so that the cleaning device is located on the telescopic tube between the main drive device and the auxiliary drive device, and the cleaning device on the telescopic tube can be driven by the main drive device and the auxiliary drive device to move horizontally.

[0016] 3. This device can be connected to an external water supply device or a cleaning agent storage device through the water pipe on the main drive device, and the water or cleaning agent can be transported to the inside of the water spray chamber, and the adhesion on the surface of the photovoltaic panel can be softened through the water spray hole, so as to improve the cleaning effect of the photovoltaic panel.

[0017] 4. The electromagnetic device of this device is slidably installed on the telescopic tube, which is convenient for approaching the magnetic steel, ensuring the adsorption strength between the electromagnetic device and the magnetic steel, and preventing the cleaning device from failing to follow the magnetic steel to rise along the telescopic tube. When the second motor is not working, the magnetic steel will drag the traction rope to slide to the bottom of the telescopic tube under its own weight. When the magnetic steel slides into the inside of the electromagnetic coil, the electromagnetic coil generates magnetic force by starting the power supply to ensure mutual adsorption with the magnetic steel. The two ends of the magnetic steel are conical structures, which facilitate the smooth movement of the magnetic steel between the outer tube and the inner tube.

[0018] 5. The conical grooves at both ends of the through hole of the sliding seat of the device can prevent the cleaning device from getting stuck due to the different diameters between the outer tube and the inner tube when the cleaning device moves up and down along the inner tube and the outer tube, thereby ensuring the smoothness of the cleaning device when moving up and down. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 2 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0021] Figure 3 is a cross-sectional view of the present invention;

[0022] Figure 4 is a cross-sectional view of the outer tube;

[0023] Figure 5 A sectional view of the main drive unit;

[0024] Figure 6 Schematic diagram of the structure of the inner tube.

[0025] In the figure: 1. main drive device; 2. auxiliary drive device; 3. water pipe; 4. water spray chamber; 5. water spray hole; 6. first motor; 7. main drive wheel; 8. main auxiliary wheel; 9. second motor; 10. winding roller; 11. traction rope; 12. magnetic steel; 13. outer tube; 14. inner tube; 15. slide groove; 16. limit groove; 17. limit block; 18. sliding seat; 19. electromagnetic coil; 20. power supply; 21. connecting block; 22. third motor; 23. cleaning disc; 24. bristles; 25. connecting rod; 26. fourth motor; 27. auxiliary drive wheel; 28. auxiliary auxiliary wheel; 29. ​​limit ring. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Embodiment 1

[0028] A new photovoltaic panel cleaning tool, such as Figure 1-Figure 6 As shown, it includes a main drive device 1 and an auxiliary drive device 2, and a telescopic tube is connected between the main drive device 1 and the auxiliary drive device 2. The telescopic tube includes an outer tube 13 and an inner tube 14. A slide groove 15 is opened inside the outer tube 13, and a plurality of limit grooves 16 are arranged along the slide groove 15 array inside the outer tube 13. The inner tube 14 is sleeved inside the appearance, and a limit block 17 matched with the slide groove 15 and the limit groove 16 is arranged outside the end of the inner tube 14 close to the main drive device 1. A second motor 9 is arranged inside the main drive device 1, and a winding roller 10 is installed at the power output end of the second motor 9. A traction rope 11 is wound around the winding roller 10, and a magnetic steel 12 capable of sliding along the outer tube 13 and the inner tube 14 is installed at one end of the traction rope 11. A cleaning device is sleeved on the telescopic tube, and the cleaning device includes an electromagnetic device, and the electromagnetic device can cooperate with the magnetic steel 12.

[0029] The main drive device 1, the auxiliary drive device 2 and the telescopic tube can be detachably connected, which is convenient for the operator to separate the devices and transport them to the roof separately, and then connect the main drive device 1 and the telescopic tube, which is convenient for the operator to extend the telescopic tube to a suitable length, and then push the main drive device 1 to the top of the inclined photovoltaic panel with a higher horizontal height, ensuring that the main drive wheel 7 abuts against the top side of the photovoltaic panel, and the main auxiliary wheel 8 abuts against the inclined surface of the photovoltaic panel, and the slide groove 15 inside the outer tube 13 facilitates the limit block 17 at the end of the inner tube 14 to slide in the slide groove 15, ensuring that the telescopic tube After the length is met, the inner tube 14 is screwed so that the limit block 17 at the end of the inner tube 14 and the limit groove 16 at the corresponding position are engaged with each other to ensure that the telescopic tube will not be extended or retracted. Then the cleaning device is installed on the telescopic tube, and the auxiliary drive device 2 is subsequently rotated at the bottom of the telescopic tube to ensure that the auxiliary drive wheel 27 is in contact with the bottom side of the photovoltaic panel, and the auxiliary auxiliary wheel 28 is in contact with the inclined surface of the photovoltaic panel, so that the cleaning device is located on the telescopic tube between the main drive device 1 and the auxiliary drive device 2, and the cleaning device on the telescopic tube can be driven by the main drive device 1 and the auxiliary drive device 2 to move horizontally;

[0030] Since a second motor 9 is arranged inside the main driving device 1, the second motor 9 can drive the winding roller 10 to wind up the traction rope 11, so as to control the magnetic steel 12 to move up and down in the telescopic tube, and the electromagnetic device on the cleaning device can work and cooperate with the magnetic steel 12. When the magnetic steel 12 is adsorbed by the electromagnetic device, the cleaning device can be driven by the second motor 9 to move up and down along the photovoltaic panel, so as to facilitate the cleaning device to perform radial cleaning of the photovoltaic panel. When the second motor 9 stops working, under the dead weight of the cleaning device, the cleaning device can drive the magnetic steel 12 and the traction rope 11 to move downwardly where the photovoltaic panel is inclined and perform cleaning work. By reciprocatingly cleaning a radial plane that can be covered by the cleaning device, the cleaning effect is ensured, and the device can be quickly disassembled, so as to facilitate the operator to quickly transport and install the device, and the device can control the cleaning through the controller, so as to reduce the labor intensity of the operator and reduce the danger of the operator performing cleaning work on the roof.

[0031] A first motor 6 is arranged on the top of the main driving device 1, and a main driving wheel 7 is installed at the power output end of the first motor 6. The main driving wheel 7 is arranged at the bottom of the main driving device 1, and the main driving wheel 7 can abut against the side of the photovoltaic panel. The bottom side of the main driving device 1 is also equipped with a main auxiliary wheel 8 that can abut against the upper surface of the photovoltaic panel. A water spray chamber 4 is arranged inside the side of the main driving device 1 close to the photovoltaic panel, and a water spray hole 5 is opened on the side of the water spray chamber 4 close to the photovoltaic panel. A water pipe 3 that can be connected to an external water supply device is arranged on the side of the water spray chamber 4 away from the water spray hole 5.

[0032] A fourth motor 26 is disposed on the top of the auxiliary driving device 2, and an auxiliary driving wheel 27 capable of abutting against the side of the photovoltaic panel is installed at the power output end of the fourth motor 26. A secondary auxiliary wheel 28 capable of abutting against the upper surface of the photovoltaic panel is also disposed at the bottom of the auxiliary driving device 2.

[0033] Since the main auxiliary wheel 8 and the auxiliary auxiliary wheel 28 can abut against the surface of the photovoltaic panel, it is ensured that the device can be kept parallel to the inclined photovoltaic panel, and the main driving wheel 7 and the auxiliary driving wheel 27 can effectively drive the cleaning device to move horizontally, and cooperate with the cleaning device to clean radially along the telescopic tube to ensure that the entire surface of the photovoltaic panel is fully cleaned. Since the photovoltaic panel is not cleaned for a long time, bird droppings or other foreign matter will adhere to the surface of the photovoltaic panel. The water pipe 3 on the main driving device 1 can be connected to an external water supply device or a cleaning agent storage device to transport water or cleaning agent to the inside of the water spray chamber 4, and the adhesion on the surface of the photovoltaic panel is softened through the water spray hole 5, so as to improve the cleaning effect of the photovoltaic panel.

[0034] The cleaning device further includes a third motor 22, which is connected to the electromagnetic device via a connecting block 21. A cleaning disc 23 is installed at the power output end of the third motor 22, and bristles 24 capable of contacting the upper surface of the photovoltaic panel are arranged at the bottom of the cleaning disc 23. The cleaning disc 23 can be driven to rotate by starting the third motor 22, and the bristles 24 at the bottom of the cleaning disc 23 can effectively clean the dust or attachments on the surface of the photovoltaic panel when the cleaning disc 23 rotates.

[0035] The electromagnetic device includes a sliding seat 18 having a through hole inside. The sliding seat 18 is installed on the telescopic rod through the through hole. An electromagnetic coil 19 is arranged inside the sliding seat 18. A power supply 20 for providing energy to the electromagnetic coil 19 is arranged on the top of the sliding seat 18.

[0036] The electromagnetic device is slidably installed on the telescopic tube to facilitate approaching the magnetic steel 12, ensuring the adsorption strength between the electromagnetic device and the magnetic steel 12, and preventing the cleaning device from failing to follow the magnetic steel 12 and rising along the telescopic tube. When the second motor 9 is not working, the magnetic steel 12 will drag the traction rope 11 to slide to the bottom of the telescopic tube under its own weight. When the magnetic steel 12 slides into the electromagnetic coil 19, the electromagnetic coil 19 generates magnetic force by starting the power supply 20 to ensure mutual adsorption with the magnetic steel 12. The two ends of the magnetic steel 12 are conical structures, which facilitate the smooth movement of the magnetic steel 12 between the outer tube 13 and the inner tube 14.

[0037] The telescopic tube is made of non-metallic material. Both ends of the through hole of the sliding seat 18 are provided with conical grooves. The inner end of the inner tube 14 close to the main driving device 1 is provided with a conical groove.

[0038] The telescopic tube made of non-metallic material can avoid mutual adsorption with the electromagnetic device, which would cause the cleaning device to be unable to move up and down, and the conical grooves at both ends of the through hole of the sliding seat 18 can facilitate the cleaning device to move up and down along the inner tube 14 and the outer tube 13. It can avoid the cleaning device from getting stuck due to the different diameters between the outer tube 13 and the inner tube 14, thereby ensuring the smoothness of the cleaning device when moving up and down.

[0039] Embodiment 2

[0040] On the basis of embodiment one, a connecting rod 25 is provided at one end of the inner tube 14 close to the auxiliary drive device 2, and a through hole is provided inside the auxiliary drive device 2. The auxiliary drive device 2 is sleeved on the connecting rod 25, and a limiting ring 29 is installed through a thread on the end of the connecting rod 25 away from the inner tube 14.

[0041] By arranging a connecting rod 25 at the end of the inner tube 14 away from the main drive device 1, it is convenient to install the auxiliary drive device 2 on the connecting rod 25. The end of the connecting rod 25 away from the inner tube 14 is threadedly installed with a limiting ring 29. After the length of the telescopic tube is determined, when the auxiliary drive device 2 is installed on the connecting rod 25, the position of the auxiliary drive device 2 is limited by the limiting ring 29 to ensure that the auxiliary drive wheel 27 on the auxiliary drive device 2 can effectively abut against the side of the photovoltaic panel, so as to cooperate with the main drive wheel 7 to realize the lateral movement of the device along the surface of the photovoltaic panel.

[0042] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A novel photovoltaic panel cleaning tool, comprising a main drive device (1) and an auxiliary drive device (2), characterized in that: A telescopic tube is connected between the main drive device (1) and the auxiliary drive device (2), and the telescopic tube comprises an outer tube (13) and an inner tube (14). A slide groove (15) is provided inside the outer tube (13), and a plurality of limit grooves (16) are arranged in an array along the slide groove (15) inside the outer tube (13). The inner tube (14) is sleeved inside the outer tube, and a limit block (16) adapted to the slide groove (15) and the limit groove (16) is arranged on the outside of one end of the inner tube (14) close to the main drive device (1). 17), a second motor (9) is arranged inside the main drive device (1), a winding roller (10) is installed at the power output end of the second motor (9), a traction rope (11) is wound around the winding roller (10), one end of the traction rope (11) is installed with a magnetic steel (12) that can slide along the outer tube (13) and the inner tube (14), and a cleaning device is sleeved on the telescopic tube, the cleaning device includes an electromagnetic device, and the electromagnetic device can cooperate with the magnetic steel (12).

2. A novel photovoltaic panel cleaning tool as claimed in claim 1, characterized in that: A first motor (6) is arranged on the top of the main drive device (1), a main drive wheel (7) is installed at the power output end of the first motor (6), the main drive wheel (7) is arranged at the bottom of the main drive device (1), the main drive wheel (7) can abut against the side of the photovoltaic panel, the bottom side of the main drive device (1) is also equipped with a main auxiliary wheel (8) that can abut against the upper surface of the photovoltaic panel, a water spray chamber (4) is arranged inside the side of the main drive device (1) close to the photovoltaic panel, a water spray hole (5) is opened on the side of the water spray chamber (4) close to the photovoltaic panel, and a water pipe (3) that can be connected to an external water supply device is arranged on the side of the water spray chamber (4) away from the water spray hole (5).

3. A novel photovoltaic panel cleaning tool as claimed in claim 2, characterized in that: A fourth motor (26) is arranged at the top of the auxiliary drive device (2), and an auxiliary drive wheel (27) capable of abutting against the side of the photovoltaic panel is installed at the power output end of the fourth motor (26). The bottom of the auxiliary drive device (2) is also provided with an auxiliary auxiliary wheel (28) capable of abutting against the upper surface of the photovoltaic panel.

4. A novel photovoltaic panel cleaning tool as claimed in claim 3, characterized in that: The cleaning device also includes a third motor (22), the third motor (22) is connected to the electromagnetic device via a connecting block (21), a cleaning disc (23) is installed at the power output end of the third motor (22), and bristles (24) capable of abutting against the upper surface of the photovoltaic panel are arranged at the bottom of the cleaning disc (23).

5. A novel photovoltaic panel cleaning tool as claimed in claim 4, characterized in that: The electromagnetic device comprises a sliding seat (18), the sliding seat (18) has a through hole inside, the sliding seat (18) is installed on the telescopic rod through the through hole, an electromagnetic coil (19) is arranged inside the sliding seat (18), and a power supply (20) for providing energy for the electromagnetic coil (19) is arranged on the top of the sliding seat (18).

6. A novel photovoltaic panel cleaning tool as claimed in claim 5, characterized in that: The telescopic tube is made of non-metallic material, both ends of the through hole of the sliding seat (18) are provided with conical grooves, and the inner end of the inner tube (14) close to the main driving device (1) is provided with a conical groove.

7. A novel photovoltaic panel cleaning tool as claimed in claim 6, characterized in that: A connecting rod (25) is provided at one end of the inner tube (14) close to the auxiliary drive device (2); a through hole is provided inside the auxiliary drive device (2); the auxiliary drive device (2) is sleeved on the connecting rod (25); and a limiting ring (29) is installed on one end of the connecting rod (25) away from the inner tube (14) through a thread.