A protection device for photovoltaic solar panels

Abstract

The application discloses a kind of photovoltaic solar power generation panel protection equipment, including photovoltaic solar panel main body and support seat, the bottom end of photovoltaic solar panel main body is equipped with protection assembly, protection assembly includes wind shield and protection piece, wind shield is composed of protection net and machine support, the protection net is set in the middle of adjacent two machine supports on the same side, by the relative positive and negative rotation of adjacent two machine supports, make protection net unroll and store, when protection net unrolls, the periphery of the photovoltaic solar panel main body is shielded, external wind sand is intercepted, reduce the blowing and influence of the photovoltaic solar panel main body in gale weather.The present application is composed of micro motor, bidirectional ball screw and cross folding rod by folding piece inside roof, when hail sensor triggers, bidirectional ball screw rotates and drives the change of folding rod inner angle angle, makes roof quickly unroll and cover photovoltaic panel top, forms buffer barrier, improves the protection of photovoltaic solar panel in hail weather.

Description

TECHNICAL FIELD

[0001] The application relates to a photovoltaic power generation device protection device, in particular to a photovoltaic solar power generation panel protection device, and belongs to the photovoltaic power generation device protection technical field. BACKGROUND

[0002] With the increasing demand for clean energy worldwide, photovoltaic solar power generation technology has been widely used. Due to external interference, photovoltaic solar power generation panels need to be protected.

[0003] Through retrieval, a photovoltaic solar power generation panel protection device is disclosed in Chinese Patent No. CN119254085A. The cooperation of the wind stabilizing device and the heat dissipation device improves the stability of the photovoltaic power generation panel in strong wind weather, so that it is not easy to be overturned, and the heat dissipation performance is improved by using wind energy, thereby increasing the power generation efficiency. However, in the above-mentioned patent product, only the stability of the photovoltaic solar panel in strong wind weather is improved. In extreme weather such as hail, the hail will cause serious impact on the surface of the power generation panel, causing certain loss. SUMMARY

[0004] The purpose of the present application is to provide a photovoltaic solar power generation panel protection device to solve the above problems.

[0005] The application achieves the above-mentioned purpose through the following technical scheme. A photovoltaic solar power generation panel protection device comprises a photovoltaic solar panel main body and a support seat. The bottom end of the photovoltaic solar panel main body is provided with a protection assembly. The protection assembly comprises a wind shielding piece and a protection piece. The wind shielding piece is composed of a protection net and a machine support. The protection net is arranged between two adjacent machine supports on the same side. By relatively rotating the two adjacent machine supports, the protection net can be unfolded and stored. When the protection net is unfolded, it can shield the photovoltaic solar panel main body around and intercept external wind and sand, thereby reducing the blowing and influence of strong wind weather on the photovoltaic solar panel main body.

[0006] The protection piece is composed of a ceiling and a protection plate. The ceiling is arranged in a folded corrugated shape. The protection plate is provided with linear guides on both sides. The protection plate moves at the bottom end of the photovoltaic solar panel main body through the driving of the linear guides. When the protection plate moves, it drives the ceiling to move outward. Drive motors and execution motors are respectively arranged between the connection position of the ceiling and the protection plate and between the protection plate and the linear guides. The drive motor drives the protection plate to change from a horizontal shape to a vertical shape. The execution motor drives the ceiling to rotate around the protection plate until the ceiling is connected with the protection plate at an angle of 90 degrees. The inside of the ceiling is provided with a folding piece. The folding piece is unfolded and folded to drive the folded corrugation of the ceiling to unfold and fold, thereby shielding and protecting the top end of the photovoltaic solar panel main body.

[0007] Preferably, both the support base and the machine bracket have an "I" shaped cross-section.

[0008] Preferably, a side plate is provided between the two support seats located on both sides of the bottom end of the photovoltaic solar panel body, the linear guide rail is disposed inside the side plate, and the two side plates are provided with grooves on opposite sides.

[0009] Preferably, the folding component mainly consists of a micro motor, a folding rod, a rotating shaft, a moving block, and a bidirectional ball screw. Two bidirectional ball screws are provided, with their ends connected. One end of one of the bidirectional ball screws is equipped with a micro motor, and both sides of the two bidirectional ball screws are equipped with moving blocks.

[0010] Preferably, the folding rods are arranged in a cross shape, and a pivot is provided at the intersection of the folding rods and at the connection between the folding rods and the moving block. The folding rods rotate around the pivot, and the canopy is unfolded and folded by changing the internal angle of the folding rods.

[0011] Preferably, the pivot at the intersection of the folding rods is fixedly connected to the interior of the ceiling, and the threads on the two bidirectional ball screws are arranged in a "one positive, one negative, one positive, one negative" configuration.

[0012] Preferably, the bottom end of the protective plate is provided with a lotus leaf biomimetic hydrophobic structure. When the protective plate rotates with the drive motor to be perpendicular to the side plate, the lotus leaf biomimetic hydrophobic structure faces outward, and the lotus leaf biomimetic hydrophobic structure can reduce wind resistance.

[0013] The present invention has the following beneficial effects:

[0014] 1. The internal folding mechanism of the canopy consists of a micro motor, a bidirectional ball screw, and a cross-shaped folding rod. When the hail sensor is triggered, the bidirectional ball screw rotates, causing the inner angle of the folding rod to change, so that the canopy can quickly unfold and cover the photovoltaic panels, forming a buffer barrier and improving the protection of the photovoltaic solar panels in hail weather.

[0015] 2. The protective netting is installed between adjacent machine supports and can be deployed or retracted by rotating the machine supports in both directions. When deployed, it can shield the photovoltaic solar panels from external wind and sand, reducing the impact of strong winds on the panels.

[0016] 3. The outer layer of the protective net is made of a blend of Kevlar fiber and basalt fiber and coated with polyurea elastomer to resist hail impact; the middle layer is a composite of high-density polyethylene microporous membrane and aluminum-magnesium alloy wire mesh, combined with wavy pleats and aluminum alloy guide strips to guide airflow and reduce wind resistance; the inner layer is a composite of EVA foam and fiberglass mesh, combined with shape memory alloy wires, which can reduce the mesh size at low temperatures to prevent hail fragments from penetrating, while the bottom elastic silicone pad absorbs vibration and prevents breakage at the joints;

[0017] 4. The roof is foldable and corrugated, and can be unfolded and folded by the action of the folding parts; after unfolding, it covers the top of the photovoltaic solar panel body. Its flexible polycarbonate board material has an impact resistance of 80kJ / m², can withstand the impact of 30mm hail, and has a light transmittance of more than 80%, which does not affect power generation.

[0018] 5. The support frame surface is coated with a nano-ceramic coating, which is UV resistant, corrosion resistant, and self-cleaning, and has passed the salt spray test for over 2000 hours; the linear guide rail is made of high-frequency quenched bearing steel, with hot-dip galvanized surface and coated with nano-silica sol, and has a salt spray resistance of >2000h; the polyurea coating of the protective net and the UV coating of the roof make the equipment perform stably in an environment of -40℃ to +120℃ and are not prone to aging and cracking. Attached Figure Description

[0019] Figure 1 This is a three-dimensional view of the overall structure of a protective device for a photovoltaic solar panel proposed in this invention;

[0020] Figure 2 This is a three-dimensional view of the overall structure of a protective device for a photovoltaic solar panel proposed in this invention;

[0021] Figure 3 This is a schematic diagram of the protective component structure of a protective device for a photovoltaic solar power panel proposed in this invention;

[0022] Figure 4 This is a three-dimensional structural view of a protective device for a photovoltaic solar panel proposed in this invention;

[0023] Figure 5 This is a schematic diagram of the protective canopy and protective panel structure of a photovoltaic solar power generation panel proposed in this invention;

[0024] Figure 6 This is a schematic diagram of the protective canopy and protective panel structure of a photovoltaic solar power generation panel proposed in this invention;

[0025] Figure 7 This is a schematic diagram of the location of the V-shaped drainage channel in the protective device for a photovoltaic solar panel proposed in this invention.

[0026] In the figure: 1, photovoltaic solar panel main body; 2, support seat; 3, protection assembly; 301, ceiling; 302, protection plate; 303, drive motor; 304, two-way ball screw; 305, folding rod; 306, machine support; 307, protective net; 308, storage groove; 309, grid hole; 310, execution motor; 311, micro motor; 312, rotating shaft; 313, moving block; 4, side plate; 401, rectangular bottom frame; 5, lotus leaf bionic hydrophobic structure; 6, V-shaped drainage groove. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Embodiment one:

[0028] Reference Figures 1-7 A protection device for a photovoltaic solar power generation panel, comprising a photovoltaic solar panel main body 1 and a support seat 2, the bottom end of the photovoltaic solar panel main body 1 is provided with a protection assembly 3, the protection assembly 3 comprises a wind-blocking piece and a protection piece, the wind-blocking piece is composed of a protective net 307 and a machine support 306, the protective net 307 is arranged between the adjacent two machine supports 306 on the same side, by relatively and reversely rotating the adjacent two machine supports 306, the protective net 307 is unfolded and stored, when the protective net 307 is unfolded, it shields the photovoltaic solar panel main body 1 around and intercepts external wind and sand, thereby reducing the blowing and influence of strong wind on the photovoltaic solar panel main body 1.

[0029] The protection piece is composed of a ceiling 301 and a protection plate 302, the ceiling 301 is arranged in a folded corrugated shape, the protection plate 302 is provided with a linear guide rail on both sides, the protection plate 302 is moved at the bottom end of the photovoltaic solar panel main body 1 by driving of the linear guide rail, when the protection plate 302 moves, it drives the ceiling 301 to move outward, the connection position of the ceiling 301 and the protection plate 302 and the linear guide rail between the protection plate 302 are respectively provided with a drive motor 303 and an execution motor 310, the drive motor 303 drives the protection plate 302 to change from horizontal to vertical, the execution motor 310 drives the ceiling 301 to rotate around the protection plate 302, until the ceiling 301 and the protection plate 302 are connected at 90°, the inside of the ceiling 301 is provided with a folding piece, by folding and unfolding of the folding piece, the folded corrugation of the ceiling 301 is unfolded and folded, thereby shielding and protecting the top end of the photovoltaic solar panel main body 1.

[0030] The folding piece is mainly composed of a micro motor 311, a folding rod 305, a rotating shaft 312, a moving block 313 and two bidirectional ball screws 304. The two bidirectional ball screws 304 are connected at their ends. One end of one of the two bidirectional ball screws 304 is provided with the micro motor 311. The two sides of the two bidirectional ball screws 304 are provided with the moving block 313.

[0031] In the embodiment, it is to be noted that the photovoltaic solar panel body 1 is arranged in an inclined manner. The support seats 2 are arranged around the bottom end of the photovoltaic solar panel body 1. The four support seats 2 are provided with a rectangular bottom frame 401 outside. The rectangular bottom frame 401 is located at the bottom end of the side plate 4. The top end of the rectangular bottom frame 401 is provided with a receiving groove 308. The bottom end of the receiving groove 308 is provided with a grid hole 309.

[0032] The bottom end of the photovoltaic solar panel body 1 is provided with a plurality of V-shaped drainage plates 6 at equal intervals. When the protection assembly 3 is not opened, the V-shaped drainage plates 6 can reduce the wind resistance by shunting the wind force.

[0033] The photovoltaic solar panel body 1 is provided with an intelligent protection system, which includes a wind speed sensor, a sand and dust concentration sensor and a hail sensor. The wind speed sensor and the hail sensor are installed on the support seat 2 and are used to monitor the wind speed and whether there is hail in the environment in real time. The wind speed sensor, the sand and dust concentration sensor, the hail sensor, the servo motor of the machine support 306, the driving motor 303, the execution motor 310 and the micro motor 311 are electrically connected with a PLC controller of a CX8100 type, which is used to receive the sensor data and control the action of the machine support 306 according to a preset program.

[0034] When the wind speed sensor detects that the wind speed exceeds a set threshold value, the servo motor of the machine support 306 is started by the PLC controller, and the machine support 306 is rotated from the horizontal to the vertical in the receiving groove 308. At this time, as the two machine supports 306 act vertically, the protection net 307 located between the two machine supports 306 is pulled open, forming a windproof barrier and reducing the impact of the wind force on the power generation panel. When the hail sensor detects hail, the linear guide rail drives the protection plate 302 to move out until the end of the side plate 4. At this time, the driving motor 303 is started to drive the protection plate 302 and the ceiling 301 to rotate until they are vertical. Then, the execution motor 310 is started to drive the ceiling 301 to rotate to form an “L” shape with the protection plate 302. At this time, the ceiling 301 is located directly above the photovoltaic solar panel body 1. At this time, the micro motor 311 is started to drive the bidirectional ball screw 304 to rotate. At this time, the moving blocks 313 are close to each other, so that the folding rod 305 is deformed. The inner angles of the quadrilateral composed of the folding rod 305 change, so that the ceiling 301 is unfolded until it completely covers the photovoltaic solar panel body 1 above. The buffer material of the ceiling 301 resists the impact of hail. Example 2:

[0035] Unlike Example 1, referring to Figures 1-4 This embodiment also has the following further features: the cross-sections of both the support base 2 and the machine bracket 306 are "I" shaped.

[0036] A side plate 4 is provided between two support bases 2 located on both sides of the bottom of the photovoltaic solar panel body 1. A linear guide rail is set inside the side plate 4, and a groove is provided on the opposite side of the two side plates 4.

[0037] In this embodiment, it should be noted that the support base 2 and the machine bracket 306 are cast from high-strength alloy steel, and the cross-section of the support base 2 and the machine bracket 306 is I-shaped to enhance the bending and torsional resistance.

[0038] The bottom of the machine support 306 is fixed to the rectangular base frame 401 by an embedded hinge seat. The hinge seat has a built-in double-row tapered roller bearing, which can withstand axial and radial bidirectional loads to ensure the stability of the support under strong winds.

[0039] Each machine stand 306 is equipped with a servo motor. The servo motor is a rare earth permanent magnet synchronous motor with high torque density and fast response characteristics. It can start up to the rated speed in 0.5 seconds, rotate the machine stand 306 out of the storage slot 308, and unfold the protective net 307.

[0040] The surface of the machine support 306 is treated with a nano-ceramic coating, providing UV resistance, corrosion resistance, and self-cleaning capabilities, and has passed over 2000 hours of salt spray testing. A sealed protective chamber is added to the bottom of the machine support 306, outside the servo motor drive components. The chamber is filled with waterproof and dustproof lubricating grease, and with a double-lip seal, it effectively prevents sand and rainwater intrusion. Furthermore, a hydraulic buffer device is installed at the bottom of the machine support 306. When the protective net 307 encounters extreme strong winds, the buffer device automatically activates, absorbing the impact force and limiting excessive rotation of the machine support 306 to prevent structural damage.

[0041] The protective net 307 adopts a layered composite structure design. The outer layer is an impact-resistant protective layer, which is woven with 6 layers of Kevlar fiber and basalt fiber, and the surface is coated with a 50μm thick polyurea elastomer coating.

[0042] It uses a 10×10mm diamond grid, with a 3mm diameter stainless steel helical spring embedded at the grid nodes to form an "elastic buffer node". When hail hits, the spring can deform by 0.5-1mm, further dispersing the impact force.

[0043] Kevlar fiber tensile strength ≥ 3.6 GPa, can resist the impact of hail below 25 mm in diameter (referring to UL2218 standard); polyurea coating has 90A Shore hardness, elastic recovery rate ≥ 95%, can absorb hail impact energy and avoid rigid rupture.

[0044] The middle layer of the layered composite structure design of the protective net 307 is a windproof and flow guiding layer, which is composed of high-density polyethylene (HDPE) microporous film and aluminum-magnesium alloy wire mesh. The microporous diameter is 0.3-0.5 mm, and the air permeability is ≥200 m³ / (m²·h).

[0045] The net surface is designed with a wave-shaped fold at an angle of 15°, which utilizes the principle of aerodynamics to guide the strong wind flow into a spiral vortex, thereby reducing the wind resistance coefficient (the actual wind resistance is reduced by 40% compared with the flat net).

[0046] Three aluminum alloy flow guiding strips (cross section in NACA airfoil shape) are arranged transversely along the net surface. When the wind speed is ≥10 m / s, the flow guiding strips generate lift to assist the protective net 307 in automatically adjusting the angle and forming a dynamic windproof posture of "contraction of the windward surface and expansion of the leeward surface".

[0047] The inner layer of the protective net 307 is a support and cushioning layer, which is composed of 5 mm thick EVA foam and glass fiber mesh. The foam porosity is ≥80%, the density is 40 kg / m³, and the foam layer is embedded with a memory alloy wire (Ni-Ti alloy) mesh with a diameter of 1 mm. At room temperature, the mesh is in the form of a 10×10 cm square hole. When the temperature is <0℃, the alloy wire shrinks to reduce the mesh hole to 5×5 cm, preventing hail fragments from penetrating. The bottom is connected to the machine support 306 through an elastic silicone rubber pad with a hardness of 50 Shore A, which can absorb the mechanical vibration of the machine support 306 during rotation, preventing the protective net 307 from breaking due to long-term fatigue at the connection with the machine support 306.

[0048] The ceiling 301 is made of flexible polycarbonate (FPC) plate material. The flexible polycarbonate (FPC) plate has the following properties:

[0049] Flexibility: The modified FPC plate (with elastic additives) can be bent into an arc shape (bending radius ≥ 150 mm) and can be folded and stretched with the folding rod 305.

[0050] Impact resistance: The impact resistance reaches 80 kJ / m², which can resist 30 mm hail impact.

[0051] Light transmittance: The light transmittance is more than 80%, and transparent or frosted options are available. When protecting the top end of the photovoltaic solar panel body 1, it will not affect the power generation of the solar panel.

[0052] Weather resistance: UV coating protection, stable performance in -40℃~+120℃ environment, not easy to age and crack. Embodiment three:

[0053] Referring to Figures 5-6 , compared with embodiment one and embodiment two, in this embodiment: the folding rods 305 are arranged in a cross shape, the folding rods 305 are provided with rotating shafts 312 at the cross positions and the connecting positions with the moving blocks 313, the folding rods 313 rotate around the rotating shafts 312, the folding rods 313 realize the unfolding and folding of the ceiling 301 through the change of the internal inner angle, the rotating shafts 312 at the cross positions of the folding rods 313 are fixedly connected with the ceiling 301, and the threads on the upper surfaces of the two bidirectional ball screws 304 are arranged in a "one positive, one negative, one positive and one negative" shape after being connected.

[0054] The bottom end of the protective plate 302 is provided with a lotus leaf bionic hydrophobic structure 5, when the protective plate 302 rotates to be perpendicular to the side plate 4 under the driving of the driving motor 303, the lotus leaf bionic hydrophobic structure 5 faces the outside, and the lotus leaf bionic hydrophobic structure 5 can reduce the wind resistance.

[0055] In this embodiment, it should be noted that the folding rods 305 are selected from 6063-T5 aluminum alloy profiles to provide support stiffness.

[0056] The threads on the upper surfaces of the two bidirectional ball screws 304 are arranged in a "one positive, one negative, one positive and one negative" shape after being connected, when the same micro motor 311 is started, the two connected bidirectional ball screws 304 are driven to rotate, the moving block 313 located at the positive thread position moves to the left, and the moving block 313 located at the negative thread position moves to the right, that is, two groups of folding rods 305 can be simultaneously driven to fold and unfold, which provides support stiffness for the ceiling 301 and facilitates the unfolding and storage of the ceiling 301.

[0057] When the protective plate 302 rotates to be perpendicular to the side plate 4 under the driving of the driving motor 303, the lotus leaf bionic hydrophobic structure 5 faces the outside, the lotus leaf bionic hydrophobic structure 5 is a micron-level papilla + nanometer-level wax crystal structure on the surface of a lotus leaf, can make the airflow form a "slip" effect on the surface, reduce the adhesion resistance (similar to the air layer effect of a super-hydrophobic surface), and through 3D printing on the surface of the protective plate 302, similar micro-nano protrusions are manufactured, which reduce the wind resistance and have a self-cleaning function at the same time.

[0058] The two bidirectional ball screws 304 are selected from high-strength alloy steel (42CrMo) or stainless steel (316L), the surface hardness of the former reaches HRC58-62, and the latter contains Mo≥2.5% to enhance the pitting resistance. Embodiment four:

[0059] The protective assembly 3 of the photovoltaic solar panel body 1 installed outdoors, the shell of the controller adopts glass fiber reinforced nylon (PA66+30%GF), with IP67 level sealing; meanwhile, the inner and outer surfaces of the shell are sprayed with 200 μm thick polyurea elastomer coating (weather resistance ≥2000h, salt spray test >1000h), and the internal circuit board is coated with nano ceramic insulating paint (dielectric strength >20kV / mm).

[0060] The controller is installed at the bottom end of the photovoltaic solar panel body 1, and the heat dissipation structure of the controller adopts a micro-channel liquid cooling plate, and the cooling liquid is a propylene glycol aqueous solution (freezing point-35℃), and the inner wall of the pipeline is plated with nickel-phosphorus alloy (P content 10-12%) to prevent electrochemical corrosion.

[0061] The linear guide rail adopts high-frequency quenched bearing steel (GCr15), with surface hardness HRC60-64, carburizing layer depth 0.8-1.2mm, and outer coating of hot-dip galvanizing (Zn-5%Al-RE) with thickness ≥85 μm, salt spray resistance >2000h protective coating; and the surface of the linear guide rail is closed treated: immersed in nano silica sol (particle size 15-20nm) to form a hydrophobic film layer (contact angle >130°); the slider of the linear guide rail adopts double-lip sealing rubber strip, with material of hydrogenated nitrile rubber (HNBR), ozone aging resistance >50pphm×100h.

[0062] The drive motor 303, the execution motor 310 and the servo motor adopt hydrolysis-resistant polyimide enameled wire (NEMAMW1000), with H-level (180℃) temperature resistance grade, immersed in epoxy resin insulating paint (water absorption <0.1%); the shell end cover of the motor adopts a labyrinth sealing structure, matched with a double-lip fluororubber sealing ring (FKM), with protection level reaching IP68, and the surface is hot sprayed with Al2O3 / TiO2 ceramic coating (thickness 250 μm, porosity <1%); the motor bearing selects ceramic ball bearing (Si3N4 ball + stainless steel retainer), with polyurea-based composite lithium-based grease (drop point >260℃, water resistance >95%).

Claims

1. A protective device for a photovoltaic solar panel, comprising a photovoltaic solar panel body and a support base, characterized in that: The bottom of the photovoltaic solar panel body is provided with a protective component, which includes a windbreak and a protective component. The windbreak consists of a protective net and a machine support. The protective net is set between two adjacent machine supports on the same side. By rotating the two adjacent machine supports in opposite directions, the protective net can be unfolded and retracted. When unfolded, the protective net blocks the photovoltaic solar panel body from all sides, intercepts external wind and sand, and reduces the blowing and impact of strong winds on the photovoltaic solar panel body. The protective component consists of a canopy and a protective panel. The canopy is designed with a folded corrugated shape. The protective panel has linear guide rails on both sides. The protective panel moves at the bottom of the photovoltaic solar panel body through the linear guide rails. When the protective panel moves, it causes the canopy to move outward. A drive motor and an execution motor are respectively provided at the connection point between the canopy and the protective panel and between the protective panel and the linear guide rails. The drive motor drives the protective panel to change from a horizontal to a vertical shape. The execution motor drives the canopy to rotate around the protective panel until the canopy and the protective panel are connected at 90°. The canopy has a folding component inside. The folding and unfolding of the folding component causes the folded corrugations of the canopy to unfold and fold, thus shielding and protecting the top of the photovoltaic solar panel body. A side plate is provided between the two support seats located on both sides of the bottom of the photovoltaic solar panel body. The linear guide rail is set inside the side plate. The two side plates have grooves on opposite sides. The folding component consists of a micro motor, a folding rod, a rotating shaft, a moving block, and a bidirectional ball screw. There are two bidirectional ball screws, and their ends are connected. One end of one of the bidirectional ball screws is equipped with a micro motor. Moving blocks are provided on both sides of the two bidirectional ball screws. The folding rod is arranged in a cross shape. A rotating shaft is provided at the intersection of the folding rods and at the connection between the folding rod and the moving block. The folding rod rotates around the rotating shaft. The folding rod realizes the unfolding and folding of the canopy by changing the internal angle of the folding rod.

2. The protective device for a photovoltaic solar panel according to claim 1, characterized in that: Both the support base and the machine bracket have an "I" shaped cross-section.

3. The protective device for a photovoltaic solar panel according to claim 1, characterized in that: The pivot at the intersection of the folding rods is fixedly connected to the interior of the canopy, and the threads on the two bidirectional ball screws are arranged in a "one positive, one negative, one positive, one negative" pattern.

4. The protective device for a photovoltaic solar panel according to claim 3, characterized in that: The bottom of the protective plate is provided with a lotus leaf biomimetic hydrophobic structure. When the protective plate rotates with the drive motor to be perpendicular to the side plate, the lotus leaf biomimetic hydrophobic structure faces outward.

Images