Method for cleaning photovoltaic panel by using rainwater and solar energy

Abstract

The invention discloses a method for cleaning a photovoltaic panel by utilizing rainwater and solar energy, which is characterized in that the surface of the photovoltaic panel is cleaned by collecting rainwater as cleaning water, solar energy conversion is realized by adopting a memory alloy, and when the temperature reaches a trigger temperature, the rainwater is used as the cleaning water to clean the surface of the photovoltaic panel. And the cleaning device is driven to move by the deformation of the memory alloy and the collected cleaning water is released to clean the surface of the photovoltaic panel. According to the invention, rainwater, dew and memory metal can be comprehensively utilized to provide a new feasible way for cleaning the photovoltaic panel, the effects of energy conservation and emission reduction are better achieved, and the method is particularly suitable for popularization and application in photovoltaic panel power generation areas with sufficient rainwater resources and better illumination resources in summer.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic panel cleaning, and in particular to a method for cleaning a photovoltaic panel by utilizing rainwater and solar energy. Background Art

[0002] As the global demand for renewable energy continues to grow, photovoltaic power generation has become an important form of clean energy. However, photovoltaic panels are prone to accumulate dust, stains and other pollutants during long-term use, which reduces the photoelectric conversion efficiency of photovoltaic panels. Traditional cleaning methods, such as manual cleaning and mechanical cleaning, usually require a lot of water and energy, and can cause equipment wear or damage to photovoltaic panels. Therefore, the development of a device that can fully utilize natural environmental resources and automatically and efficiently clean photovoltaic panels has become an urgent problem to be solved.

[0003] CN202410876379.6 has disclosed an automatic photovoltaic panel cleaning device, which belongs to the field of photovoltaic panel cleaning technology, including a base device, a closing device is provided on the base device, the closing device is used to close the photovoltaic panel and clean the photovoltaic panel, and a collecting device is provided on the closing device, and the collecting device is used to collect rainwater. The collecting device provided in the invention can filter rainwater in multiple layers when it rains, and collect the filtered rainwater, and use the collected rainwater to rinse and scrub the photovoltaic panel, saving water resources. However, the device uses an electric cylinder to drive the cleaning device to move to achieve cleaning, which has the defect of consuming electricity.

[0004] Therefore, how to design a more energy-saving and environmentally friendly automated cleaning method for photovoltaic panels has become a problem that technical personnel in this field need to consider and solve.

[0005] In summary, the applicant considered that if rainwater and dew could be collected and the adaptive shape change characteristics of memory metal could be used to clean photovoltaic panels, the power generation efficiency could be better improved. The device innovatively combines memory metal, dew and rainwater for cleaning, providing an efficient, energy-saving, environmentally friendly and automated cleaning solution with significant technical advantages and broad application potential and market prospects in the field of cleaning photovoltaic panel technology. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a method for cleaning photovoltaic panels using rainwater and solar energy, which can realize automated cleaning and is more energy-saving.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A method for cleaning photovoltaic panels using rainwater and solar energy. The method collects rainwater as cleaning water to clean the surface of the photovoltaic panels. The method is characterized in that a memory alloy is used to convert solar energy. When the temperature reaches a trigger temperature, the memory alloy is deformed to drive the cleaning device to move and release the collected cleaning water to clean the surface of the photovoltaic panels.

[0008] In this way, the method collects rainwater as cleaning water, and then relies on solar energy to heat the memory alloy to deform it and drive the cleaning device to move for cleaning. The comprehensive utilization of rainwater and solar energy realizes the automation of photovoltaic panel cleaning without consuming additional energy, which is more energy-saving and environmentally friendly.

[0009] Furthermore, in the method, dew water is collected as part of the clean water, which further increases the source of clean water.

[0010] Furthermore, the method is implemented by an automatic photovoltaic panel cleaning device, which includes a base fixed on the photovoltaic panel, the upper surface of the base is exposed from the surface of the photovoltaic panel to form a mounting platform, a rotating shaft that can rotate horizontally is vertically arranged upward in the middle of the mounting platform, a plurality of brush handles are extended outwardly from the rotating shaft, bristles are arranged on the lower surface of the brush handle and are in contact with the surface of the photovoltaic panel, a water storage chamber is arranged inside the brush handle, a water outlet is arranged downwardly through the lower surface of the water storage chamber, a water outlet control switch is installed on the water outlet, and a water receiving groove is also arranged on the upper surface of the brush handle to receive water A water inlet hole communicating with the water storage chamber is provided at the bottom of the groove; a driving bar is also provided on the mounting platform, which is made of a memory alloy material and has one end fixed on the mounting platform and the other end being a movable free end. The driving bar has at least one bending portion in the middle and can change its shape when the transition temperature is reached to drive the free end to move and unfold. The free end of the driving bar is connected to the starting end of a rotating shaft driving wire, the end of the rotating shaft driving wire is fixed and reversely wound on the rotating shaft (along the movable direction of the free end), and a rotating shaft reset spring is also provided between the rotating shaft and the mounting platform.

[0011] In this way, when the device is used, rainwater can be received through the water receiving trough when it rains. The rainwater can be free-falling rainwater or rainwater collected from eaves and other places through the receiving pipe. The rainwater enters the water storage chamber through the water inlet hole and is stored as clean water. Then, during the day, the temperature of the drive head rises due to sunlight. When the temperature rises to the transition temperature (the transition temperature can be set to the temperature that can be reached at the moment when the sunlight is the strongest), the drive bar deforms and drives the free end to move. The shaft is rotated by the shaft drive wire, which drives the brush handle and bristles to rotate to clean the surface of the photovoltaic panel. At this time, the water outlet control switch can be synchronously controlled to open, so that clean water flows out to improve the cleaning effect. When the temperature drops, the drive bar returns to its deformation, and the shaft is reset by the shaft reset spring.

[0012] Furthermore, an outer cover is provided above the mounting platform, an optical lens is provided at the upper end of the outer cover, the optical lens forms a focusing area on the mounting platform, the free end of the driving strip is located in the focusing area before reaching the transition temperature, and moves out of the focusing area after reaching the transition temperature, and a through hole is reserved in the middle of the outer cover for the rotating shaft to pass through.

[0013] In this way, sunlight is focused to the focusing area through the optical lens, which can better help the drive bar to heat up. At the same time, the drive bar moves out of the focusing area after being deformed due to heating up. When the temperature outside the focusing area drops, the drive bar will recover its deformation and move back to the focusing area. In this way, when the temperature of sunlight during the day reaches sufficient conditions, the drive bar can drive the shaft to rotate repeatedly, which can better ensure the cleaning effect of the solar panel.

[0014] Furthermore, the outer covers are provided with a plurality of them, the lower end of each outer cover is detachably connected to the outer side of the mounting platform, and the upper end of each outer cover is provided with an optical lens with different focusing effects.

[0015] In this way, the temperature rise of the light-collecting area can be adjusted and controlled by replacing the optical lens. Specifically, the outer cover can be set in number according to different seasons (or months) so that it can be replaced. The optical lenses on the outer covers in different seasons (or months) are set according to the sunlight conditions of the season (or month), so that in the season (or month), when the sun is the hottest during the day, the driving strip can be driven to deform within a fixed time period. In this way, the replacement of the outer cover ensures that the device can be used normally in all seasons.

[0016] Furthermore, the outer cover is composed of two half cover bodies which are arranged opposite to each other on the left and right sides, and the slots arranged at the lower end of the outer cover and the outer periphery of the mounting platform can be plugged in.

[0017] Such a detachable connection structure has the advantages of simple structure, convenient disassembly and installation, and no interference with the structure of the rotating shaft.

[0018] Furthermore, the bending portion in the middle of the driving bar has a plurality of bends that bend back and forth, so that the free end can be deformed over a greater distance, thereby better driving the rotating shaft to rotate.

[0019] Furthermore, the shaft reset spring is a spiral spring, which can better support the shaft to rotate more times and reset after rotation.

[0020] Furthermore, a filtering structure is provided at the water inlet, so as to facilitate filtering of rainwater.

[0021] Furthermore, the filtering structure includes a filter screen located below and filter cotton located above the filter screen, so as to better ensure the filtering effect.

[0022] Furthermore, a plurality of steel wire meshes are arranged in the water receiving trough, so that the steel wire meshes can condense and collect dew at night as a source of clean water, so that water can be stored in the water storage chamber even in a climate season without rain for a long time.

[0023] Furthermore, the steel wire mesh is formed by spiral steel wires arranged in a crisscross pattern, which can better improve the dew condensation effect.

[0024] Furthermore, a plurality of water outlet holes are evenly arranged in the length direction of the brush handle, so as to ensure a better water outlet effect for the bristles.

[0025] Furthermore, the water outlet control switch includes a hole cover arranged above each water outlet hole, a circle of magnets is embedded on the upper surface around the water outlet hole, and a circle of attracting bodies made of ferromagnetic material is correspondingly embedded on the lower surface around the hole cover, the hole cover is fixed to a sliding frame through a horizontally arranged connecting arm, the sliding frame can be horizontally slidably arranged on the lower surface of the water storage chamber, and a water outlet reset spring is also arranged between the sliding frame and the side wall of the water storage chamber, the water outlet control switch also includes a fixed shaft fixed to the middle part of the upper surface of the mounting platform, the rotating shaft is a hollow structure and is rotatably mounted on the fixed shaft by means of a bearing, a switch spring is also arranged between the fixed shaft and the rotating shaft at the height of the hole cover, the switch spring is a spiral spring and the middle position is fixed on the fixed shaft, the outer ring of the switch spring is respectively provided with a switch pull wire corresponding to each brush handle, the switch pull wire can slidably pass through the through holes arranged on the rotating shaft and the end of the brush handle and be connected to the sliding frame.

[0026] When the device is not working, the hole cover is fixed on the water outlet hole by the suction seal of the ferromagnetic material and the magnet body to avoid water leakage. When the device is working, the drive bar is driven by the memory alloy to drive the rotating shaft to start rotating, and the fixed shaft accumulates force through the switch spring and pulls the pull line. When the force is greater than the suction force of the ferromagnetic material, the hole cover can be pulled open and water can be discharged from the water outlet. The switch spring is a clockwork spring that can absorb and accommodate a large rotation angle. Therefore, the angle distance of the rotating shaft that continues to rotate after the hole cover is pulled open is absorbed by the switch spring, and will not cause damage to the water outlet control switch. After the rotating shaft is reset, the switch spring is reset normally, and the sliding frame is reset by the water outlet reset spring. After the hole cover returns to the top of the water outlet, it is fixed by the suction material and re-sealed. In this way, the above-mentioned water outlet control switch realizes the linkage control with the rotating shaft rotation process, so that after the rotating shaft rotates a short distance, the bristles complete the cleaning of the floating dust on the surface of the photovoltaic panel and then open the water outlet to discharge water, thereby further cleaning the surface of the photovoltaic panel. The cleaning effect of the photovoltaic panels is better improved, and the automatic linkage control of the water outlet cleaning process is realized.

[0027] Therefore, this device combines the adaptive shape change characteristics of memory metal with the natural cleaning efficiency of rainwater to construct a new type of automatic cleaning system. The system deforms the memory metal component through temperature conditions, and uses the deformation to drive the brush to rotate to perform auxiliary actions for cleaning the surface of the photovoltaic panel. At the same time, the system is designed with an integrated rainwater collection and diversion device, and also designed a part that uses the temperature difference between day and night to collect dew as a supplement when rainwater collection is insufficient. When the device rotates, the action of the memory metal component allows the stored rainwater and dew to flow out for cleaning, making the cleaning process more efficient and energy-saving. The device makes full use of rainwater as a natural resource and reduces dependence on artificial water sources, thereby saving a lot of water resources and energy consumption. The device automatically drives the brush to clean through sunlight, reducing manual operation costs and improving work efficiency.

[0028] Compared with most existing cleaning devices, this device innovatively combines the cleaning mechanisms of memory metal, dew and rainwater. Most existing technologies either rely on mechanical drive or rely solely on water washing, while this device forms a dual cleaning effect through the synergistic effect of natural rainwater, dew and memory metal, improving cleaning efficiency; and most cleaning devices require a large amount of water for cleaning, while this device greatly reduces the use of water and energy consumption by making full use of rainfall, condensation and the adaptive shape change characteristics of memory metal, reflecting higher economy and environmental protection; this device has a high degree of automation and can operate without human operation, while traditional cleaning methods often require regular manual intervention or monitoring, increasing maintenance costs and labor intensity.

[0029] It is located in tropical and subtropical areas, with long sunshine hours and high sunshine intensity in summer, which is very suitable for photovoltaic power generation. In addition, these areas are often affected by monsoons in summer, with heavy precipitation, especially frequent rainstorms, which is suitable for using rainwater to clean photovoltaic panels. In these areas, there is sufficient rainfall, combined with memory metal automatic cleaning technology, which can reduce manual cleaning costs and improve photovoltaic power generation efficiency.

[0030] In summary, the present invention can comprehensively utilize rainwater, dew and memory metal to provide a new feasible way for cleaning photovoltaic panels, thereby better achieving the effect of energy conservation and emission reduction. It is particularly suitable for promotion and application in photovoltaic panel power generation areas with sufficient rainwater resources and good light resources in summer. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of the photovoltaic panel automatic cleaning device adopted in the present invention.

[0032] Figure 2 for Figure 1 Front view of .

[0033] Figure 3 for Figure 2 A cross-sectional view showing only one side of the brush handle structure.

[0034] Figure 4 for Figure 3 A top view of the structure of the separate installation platform.

[0035] Figure 5 for Figure 3 A cross-sectional view of the separate rotating shaft and brush handle from a top view.

[0036] Figure 6 for Figure 3 A cross-sectional view of a separate brush handle from the side.

[0037] Figure 7 for Figure 3 Schematic diagram of the structure of a separate switch spring from a top view. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] Implementation method: A method for cleaning photovoltaic panels using rainwater and solar energy. This method collects rainwater as cleaning water to clean the surface of the photovoltaic panels. Its characteristics are that it uses memory alloys to realize solar energy conversion. When the temperature reaches the trigger temperature, the memory alloy deforms to drive the cleaning device to move and release the collected cleaning water to clean the surface of the photovoltaic panels.

[0040] In this way, the method collects rainwater as cleaning water, and then relies on solar energy to heat the memory alloy to deform it and drive the cleaning device to move for cleaning. The comprehensive utilization of rainwater and solar energy realizes the automation of photovoltaic panel cleaning without consuming additional energy, which is more energy-saving and environmentally friendly.

[0041] During implementation, the method simultaneously collects dew as part of the clean water, further increasing the source of clean water.

[0042] In this embodiment, the method is implemented by an automatic photovoltaic panel cleaning device, see Figure 1-7As shown, the photovoltaic panel automatic cleaning device includes a base 1 fixed on the photovoltaic panel, the upper surface of the base 1 is exposed on the surface of the photovoltaic panel to form a mounting platform 2, a horizontally rotatable shaft 3 is vertically upwardly arranged in the middle of the mounting platform 2, a plurality of brush handles 4 are extended outwardly from the shaft 3, bristles 5 are arranged on the lower surface of the brush handle 4 and are in contact with the surface of the photovoltaic panel, a water storage chamber 6 is arranged inside the brush handle 4, a water outlet hole 7 is arranged downwardly through the lower surface of the water storage chamber 6, a water outlet control switch is installed on the water outlet hole 7, a water receiving groove 8 is also arranged on the upper surface of the brush handle, and a water inlet hole 10 and The water storage chamber 6 is communicated with each other; a driving bar 11 is also arranged on the mounting platform, the driving bar 11 is made of memory alloy material and one end is a fixed end fixed on the mounting platform, and the other end is a movable free end. The driving bar 11 has at least one bending portion in the middle and can change its shape when the transition temperature is reached to drive the free end to move and unfold, the free end of the driving bar 11 is connected to the starting end of a rotating shaft driving wire 12, the end of the rotating shaft driving wire 12 is fixed and reversely wound on the rotating shaft 3 (along the movable direction of the free end), and a rotating shaft reset spring 13 is also arranged between the rotating shaft 3 and the mounting platform 2.

[0043] In this way, when the device is used, rainwater can be received through the water receiving trough when it rains. The rainwater can be free-falling rainwater or rainwater collected from eaves and other places through the receiving pipe. The rainwater enters the water storage chamber through the water inlet hole and is stored as clean water. Then, during the day, the temperature of the drive head rises due to sunlight. When the temperature rises to the transition temperature (the transition temperature can be set to the temperature that can be reached at the moment when the sunlight is the strongest), the drive bar deforms and drives the free end to move. The shaft is rotated by the shaft drive wire, which drives the brush handle and bristles to rotate to clean the surface of the photovoltaic panel. At this time, the water outlet control switch can be synchronously controlled to open, so that clean water flows out to improve the cleaning effect. When the temperature drops, the drive bar returns to its deformation, and the shaft is reset by the shaft reset spring.

[0044] During implementation, the vertical cross-section of the base 1 is in an I-shape as a whole and the photovoltaic panel is clamped and fixed in the middle.

[0045] Among them, an outer cover 14 is provided on the upper cover outside the mounting platform, and an optical lens 15 is provided on the upper end of the outer cover 14. The optical lens 15 forms a focusing area 16 on the mounting platform. The free end of the driving bar 11 is located in the focusing area 16 before reaching the transition temperature, and moves out of the focusing area 16 after reaching the transition temperature. A through hole is reserved in the middle of the outer cover for the rotating shaft to pass through.

[0046] In this way, sunlight is focused to the focusing area through the optical lens, which can better help the drive bar to heat up. At the same time, the drive bar moves out of the focusing area after being deformed due to heating up. When the temperature outside the focusing area drops, the drive bar will recover its deformation and move back to the focusing area. In this way, when the temperature of sunlight during the day reaches sufficient conditions, the drive bar can drive the shaft to rotate repeatedly, which can better ensure the cleaning effect of the solar panel.

[0047] There are multiple outer covers 14, the lower end of each outer cover 14 is detachably connected to the outer side of the mounting platform 2, and the upper end of each outer cover is provided with an optical lens with different focusing effects.

[0048] In this way, the temperature rise of the light-collecting area can be adjusted and controlled by replacing the optical lens. Specifically, the outer cover can be set in number according to different seasons (or months) so that it can be replaced. The optical lenses on the outer covers in different seasons (or months) are set according to the sunlight conditions of the season (or month), so that in the season (or month), when the sun is the hottest during the day, the driving strip can be driven to deform within a fixed time period. In this way, the replacement of the outer cover ensures that the device can be used normally in all seasons.

[0049] The outer cover 14 is composed of two half-cover bodies which are arranged side by side. The lower end of the outer cover 14 and the slot arranged on the outer periphery of the mounting platform 2 can be plugged in.

[0050] Such a detachable connection structure has the advantages of simple structure, convenient disassembly and installation, and no interference with the structure of the rotating shaft.

[0051] The bent portion in the middle of the driving bar 11 has a plurality of bends that meander back and forth, so that the free end can be deformed over a greater distance, thereby better driving the rotating shaft to rotate.

[0052] The rotating shaft reset spring 13 is a spiral spring, which can better support the rotating shaft to rotate more times and reset after rotation.

[0053] Wherein, a filtering structure 18 is arranged at the water inlet 10, so as to facilitate filtering of rainwater.

[0054] The filtering structure 18 includes a filter screen located below and filter cotton located above the filter screen, which can better ensure the filtering effect.

[0055] Wherein, a plurality of steel meshes 19 are also provided in the water receiving trough 8. In this way, the steel meshes can condense and collect dew at night as a source of clean water, so that water storage in the water storage chamber can be achieved in a climate season without rain for a long time.

[0056] The steel mesh 19 is formed by spiral steel wires arranged in a crisscross pattern, which can better improve the dew condensation effect.

[0057] There are a plurality of water outlet holes 7 evenly arranged in the length direction of the brush handle 4, so as to ensure a better water outlet effect for the bristles.

[0058] Among them, the water outlet control switch includes a hole cover 21 covered above each water outlet hole 7, a circle of magnets is embedded on the upper surface around the water outlet hole 7, and a circle of ferromagnetic material is embedded on the lower surface around the hole cover 21. The hole cover 21 is fixed on a sliding frame 22 through a horizontally arranged connecting arm. The sliding frame 22 can be horizontally slidably arranged on the lower surface of the water storage chamber. A water outlet reset spring 23 is also arranged between the sliding frame 22 and the side wall of the water storage chamber. The water outlet control switch also includes a fixed shaft 24 fixed to the middle of the upper surface of the mounting platform. The rotating shaft 3 is a hollow structure and is rotatably mounted on the fixed shaft 24 by bearings. A switch spring 25 is also arranged between the fixed shaft and the rotating shaft at the height of the hole cover. The switch spring 25 is a spiral spring and the middle position is fixed on the fixed shaft 24. The outer ring of the switch spring 25 corresponds to each brush handle and is respectively provided with a switch pull wire 26. The switch pull wire 26 can slide through the through holes set on the ends of the rotating shaft 3 and the brush handle 4 and is connected to the sliding frame 22.

[0059] When the device is not working, the hole cover is fixed on the water outlet hole by the suction seal of the ferromagnetic material and the magnet body to avoid water leakage. When the device is working, the drive bar is driven by the memory alloy to drive the rotating shaft to start rotating, and the fixed shaft accumulates force through the switch spring and pulls the pull line. When the force is greater than the suction force of the ferromagnetic material, the hole cover can be pulled open and water can be discharged from the water outlet. The switch spring is a clockwork spring that can absorb and accommodate a large rotation angle. Therefore, the angle distance of the rotating shaft that continues to rotate after the hole cover is pulled open is absorbed by the switch spring, and will not cause damage to the water outlet control switch. After the rotating shaft is reset, the switch spring is reset normally, and the sliding frame is reset by the water outlet reset spring. After the hole cover returns to the top of the water outlet, it is fixed by the suction material and re-sealed. In this way, the above-mentioned water outlet control switch realizes the linkage control with the rotating shaft rotation process, so that after the rotating shaft rotates a short distance, the bristles complete the cleaning of the floating dust on the surface of the photovoltaic panel and then open the water outlet to discharge water, thereby further cleaning the surface of the photovoltaic panel. The cleaning effect of the photovoltaic panels is better improved, and the automatic linkage control of the water outlet cleaning process is realized.

Claims

1. A method for cleaning photovoltaic panels using rainwater and solar energy, wherein the method collects rainwater as cleaning water to clean the surface of the photovoltaic panels, and is characterized in that: Memory alloy is used to realize solar energy conversion. When the temperature reaches the trigger temperature, the deformation of the memory alloy drives the cleaning device to move and release the collected clean water to clean the surface of the photovoltaic panel.

2. The method for cleaning photovoltaic panels using rainwater and solar energy according to claim 1, characterized in that: In the present method, dew water is simultaneously collected as part of the cleaning water.

3. The method for cleaning photovoltaic panels using rainwater and solar energy according to claim 1, characterized in that: The method is implemented by an automatic photovoltaic panel cleaning device, which includes a base fixed on the photovoltaic panel, the upper surface of the base is exposed on the surface of the photovoltaic panel to form a mounting platform, a rotating shaft that can rotate horizontally is vertically arranged upward in the middle of the mounting platform, a plurality of brush handles are extended outward from the rotating shaft, bristles are arranged on the lower surface of the brush handle and are in contact with the surface of the photovoltaic panel, a water storage cavity is arranged inside the brush handle, a water outlet hole is arranged downwardly through the lower surface of the water storage cavity, a water outlet control switch is installed on the water outlet hole, and a water receiving device is also arranged on the upper surface of the brush handle. A water inlet hole communicating with a water storage chamber is arranged at the bottom of the water receiving trough; a driving bar is also arranged on the mounting platform, the driving bar is made of a memory alloy material, one end of the driving bar is a fixed end fixed on the mounting platform, and the other end is a movable free end, the middle part of the driving bar has at least one bending part, and when the transition temperature is reached, the shape can be changed to drive the free end to move and unfold, the free end of the driving bar is connected to the starting end of a rotating shaft driving cable, the end of the rotating shaft driving cable is fixed and reversely wound on the rotating shaft, and a rotating shaft reset spring is also arranged between the rotating shaft and the mounting platform.

4. The method for cleaning photovoltaic panels using rainwater and solar energy according to claim 3, characterized in that: An outer cover is provided on the upper cover outside the mounting platform, an optical lens is provided on the upper end of the outer cover, the optical lens forms a focusing area on the mounting platform, the free end of the driving strip is located in the focusing area before reaching the transition temperature, and moves out of the focusing area after reaching the transition temperature, and a through hole is reserved in the middle of the outer cover for the rotating shaft to pass through.

5. The method for cleaning photovoltaic panels using rainwater and solar energy according to claim 4, characterized in that: The outer covers are provided in plurality, the lower end of each outer cover is detachably connected to the outer side of the mounting platform, and the upper end of each outer cover is provided with an optical lens with different focusing effects.

6. The method for cleaning photovoltaic panels using rainwater and solar energy according to claim 5, characterized in that: The outer cover is composed of two half cover bodies which are oppositely arranged on the left and right sides, and the slots arranged on the lower end of the outer cover and the outer periphery of the mounting platform can be plugged in.

7. The method for cleaning photovoltaic panels using rainwater and solar energy according to claim 3, characterized in that: The bending portion in the middle of the driving strip has a plurality of bends that meander back and forth; The rotating shaft return spring is a spiral spring.

8. The method for cleaning photovoltaic panels using rainwater and solar energy according to claim 3, characterized in that: A filtering structure is provided at the water inlet; The filtering structure comprises a filter screen located below and filter cotton located above the filter screen.

9. The method for cleaning photovoltaic panels using rainwater and solar energy according to claim 3, characterized in that: A plurality of steel wire meshes are also arranged in the water receiving trough; The steel wire mesh is formed by spiral steel wires arranged in a crisscross pattern.

10. The method for cleaning photovoltaic panels using rainwater and solar energy according to claim 3, characterized in that: The water outlet holes are arranged in a plurality and evenly distributed along the length direction of the brush handle; The water outlet control switch includes a hole cover arranged above each water outlet hole, a circle of magnets is embedded on the upper surface around the water outlet hole, a circle of attracting bodies made of ferromagnetic material is correspondingly embedded on the lower surface around the hole cover, the hole cover is fixed to a sliding frame through a horizontally arranged connecting arm, the sliding frame can be horizontally slidably arranged on the lower surface of the water storage chamber, and a water outlet reset spring is also arranged between the sliding frame and the side wall of the water storage chamber. The water outlet control switch also includes a fixed shaft fixed to the middle part of the upper surface of the mounting platform, the rotating shaft is a hollow structure and is rotatably mounted outside the fixed shaft by means of a bearing, a switch spring is also arranged between the fixed shaft and the rotating shaft at the height of the hole cover, the switch spring is a spiral spring and the middle position is fixed on the fixed shaft, the outer ring of the switch spring is respectively provided with a switch pull wire corresponding to each brush handle, the switch pull wire can slidably pass through the through holes arranged on the rotating shaft and the end of the brush handle and be connected to the sliding frame.

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