A photovoltaic building curtain wall with self-cleaning function
By designing a photovoltaic building curtain wall with self-cleaning function, and using rotating connecting rotary rods, cylindrical cams, telescopic slide rods and other mechanisms, the automatic cleaning of the photovoltaic building curtain wall is achieved, solving the problem of high risk in traditional cleaning methods, and improving power generation efficiency and aesthetics.
Patent Information
- Application Number
- CN202510232898.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2045-02-28
AI Technical Summary
After long-term use of photovoltaic building curtain walls, due to factors such as rainwater erosion and dust accumulation, dirt will be generated on the surface, reducing power generation efficiency, and traditional cleaning methods are highly dangerous, requiring high skills and experience.
A photovoltaic building curtain wall with self-cleaning function was designed, using main frame plate, movable plate, cleaning mechanism and other components. Through rotating connected rotary rods, cylindrical cams, telescopic slide rods and other mechanisms, the cleaning plates and cleaning cloths are driven to automatically clean.
Automatic cleaning of photovoltaic building curtain walls has been realized, reducing the risk and skill requirements of cleaning personnel, improving power generation efficiency and aesthetics, and reducing dependence on manual cleaning.
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Figure CN119737012B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of photovoltaic building curtain walls, in particular to a photovoltaic building curtain wall with a self-cleaning function. Background Art
[0002] Photovoltaic building curtain wall, also known as photovoltaic curtain wall or solar photovoltaic curtain wall, is a new type of building curtain wall that combines traditional curtain wall with photovoltaic power generation technology. It installs photovoltaic modules on the exterior wall or roof of the building, converts sunlight into electrical energy through the photovoltaic effect, and thus provides clean energy for the building.
[0003] After long-term use, the photovoltaic building curtain wall will produce dirt on its surface due to factors such as rain erosion and dust accumulation. The accumulation of dirt will reduce the light transmittance of the photovoltaic panels, thereby affecting the power generation efficiency. In order to ensure the power generation efficiency and aesthetics of the photovoltaic building curtain wall, the photovoltaic building curtain wall needs to be cleaned regularly. The traditional method is to use tools such as hanging ropes and hanging boards to suspend the cleaning personnel on the surface of the photovoltaic curtain wall for cleaning. However, this method is highly dangerous and requires the cleaning personnel to have high skills and experience to ensure safe and efficient cleaning results.
[0004] In order to solve the above problems, we have made improvements and proposed a photovoltaic building curtain wall with self-cleaning function. Summary of the invention
[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:
[0006] The present invention provides a photovoltaic building curtain wall with a self-cleaning function, comprising a main frame plate, a photovoltaic solar panel is laid on the front of the main frame plate, grooves are opened on both sides of the main frame plate, movable plates are arranged inside the grooves of the main frame plate, a cleaning mechanism is arranged between the two movable plates, the cleaning mechanism comprises a rotating rod rotatably connected between the two movable plates, a cylindrical cam is coaxially fixedly connected to the middle outer wall of the rotating rod, a telescopic sliding rod is slidably connected inside the curved sliding groove of the cylindrical cam, the other end of the telescopic sliding rod is fixedly connected to an intermediate plate, four spring rods are symmetrically fixedly connected to one side of the intermediate plate close to the main frame plate, the other ends of the four spring rods are fixedly connected to the same cleaning plate, and a cleaning cloth is fixedly connected to one side of the cleaning plate close to the main frame plate;
[0007] A pressing mechanism is installed on the rotating rod. The pressing mechanism includes two spur gears coaxially and fixedly connected to the rotating rod. The two spur gears are symmetric about the cylindrical cam. Three annular plates are coaxially and fixedly connected to the outer side of the spur gear at equal intervals, and the three annular plates form an inner sliding groove and an outer sliding groove. An inclined notch is formed in the annular plate at the middle position. Two guiding sliding plates are rotatably connected to the inclined notch of the annular plate through torsion springs. A sliding column is slidably connected inside the inclined notch of the annular plate. The outer end of the sliding column is fixedly connected to a first rectangular rod. The other end of the first rectangular rod is fixedly connected to a first sliding sleeve. A second rectangular rod is slidably connected inside the first sliding sleeve.
[0008] As a preferred technical solution of the present invention, a positioning sliding rod is fixedly connected between the upper and lower bottom surfaces of the groove of the main frame plate, and the positioning sliding rod is slidably connected with the movable plate.
[0009] As a preferred technical solution of the present invention, a reduction motor is installed on the side of one of the movable plates, and the output shaft of the reduction motor is coaxially and fixedly connected to the rotating rod.
[0010] As a preferred technical solution of the present invention, a fixed rod is fixedly connected to the inner side surface of the movable plate, and the other end of the fixed rod is fixedly connected to a second sliding sleeve, and the second sliding sleeve is slidably connected with the first rectangular rod.
[0011] As a preferred technical solution of the present invention, the second rectangular rod is fixedly connected to the side surface of the middle plate, and the other end of the second rectangular rod is fixedly connected to a baffle.
[0012] As a preferred technical solution of the present invention, two U-shaped plates are symmetrically and fixedly connected to the front surface of the main frame plate. A straight rack is fixedly connected to the inner side of the U-shaped plate opposite to the main frame plate, and the straight rack meshes with the spur gear.
[0013] As a preferred technical solution of the present invention, the same spraying mechanism is installed on the two movable plates. The spraying mechanism includes a water storage tank fixedly connected to the bottom surfaces of the two movable plates. A plurality of water outlet cylinders are fixedly installed on one side of the water storage tank close to the main frame plate, and through holes are formed at one ends of the water outlet cylinders located inside the water storage tank. The end of the water outlet cylinder extending outside the water storage tank is communicated with a spray head. A piston push plate with through holes formed on its surface is hermetically slidably connected to the inner wall of the water outlet cylinder. A push rod is coaxially and fixedly connected to one side of the piston push plate. A sealing plate for closing the through hole on the surface of the piston push plate is hinged to the other side of the piston push plate.
[0014] As a preferred technical solution of the present invention, one end of the water outlet cylinder to which the plurality of push rods extend is fixedly connected to the same connecting plate, and the other side of the connecting plate is fixedly connected to a rectangular sliding rod, and one end of the rectangular sliding rod extending through the water tank is fixedly connected to a resisting sliding rod, and the rectangular sliding rod is sealingly and slidably connected to the water tank;
[0015] A slide rail is fixedly connected to the side of the water tank, a rectangular plate is slidably connected to the slide rail, an inclined interference groove is provided on the rectangular plate, the interference slide rod can be slidably connected inside the interference groove of the rectangular plate, a movable rod is fixedly connected to the top surface of the rectangular plate, and the other end of the movable rod is slidably connected inside the curved groove of the cylindrical cam.
[0016] The beneficial effects of the present invention are:
[0017] This photovoltaic building curtain wall with self-cleaning function moves downward synchronously with the push rod through the piston push plate. At this time, the sealing plate closes the through hole on the surface of the piston push plate, and the water in the water outlet cylinder is sprayed from the nozzle to the surface of the photovoltaic building curtain wall for preliminary flushing. Then the rotating cylindrical cam drives the telescopic slide rod to reciprocate through the curved slide groove, and the middle plate reciprocates synchronously with the telescopic slide rod, further driving the cleaning plate to reciprocate, and the cleaning cloth on the cleaning plate wipes the photovoltaic building curtain wall.
[0018] The photovoltaic building curtain wall with self-cleaning function moves the position of the first rectangular rod through the sliding column, thereby prompting the middle plate to approach the photovoltaic solar panel and squeeze the spring rod. The spring rod will put pressure on the cleaning plate, so that the cleaning cloth can wipe the photovoltaic building curtain wall more cleanly. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0020] Figure 1 It is a three-dimensional schematic diagram of a photovoltaic building curtain wall with a self-cleaning function according to the present invention;
[0021] Figure 2 It is a front view schematic diagram of a photovoltaic building curtain wall with a self-cleaning function according to the present invention;
[0022] Figure 3 It is a top view schematic diagram of a photovoltaic building curtain wall with a self-cleaning function according to the present invention;
[0023] Figure 4 The invention discloses a photovoltaic building curtain wall with a self-cleaning function. Figure 1 A magnified schematic diagram;
[0024] Figure 5of a photovoltaic building curtain wall with self-cleaning function according to the present invention Figure 2 Enlarged schematic view at position B;
[0025] Figure 6 Schematic view of the left spur gear of a photovoltaic building curtain wall with self-cleaning function according to the present invention;
[0026] Figure 7 Schematic view of the right spur gear of a photovoltaic building curtain wall with self-cleaning function according to the present invention;
[0027] Figure 8 Cross-sectional schematic view of the water outlet cylinder of a photovoltaic building curtain wall with self-cleaning function according to the present invention;
[0028] Fig. 9 of a photovoltaic building curtain wall with self-cleaning function according to the present invention Figure 2 Cross-sectional schematic view at A-A;
[0029] In the figure: 1, main frame plate; 2, movable plate; 3, rotating rod; 4, cylindrical cam; 5, telescopic sliding rod; 6, intermediate plate; 7, positioning sliding rod; 8, spring rod; 9, cleaning plate; 10, spur gear; 11, circular ring plate; 12, guiding sliding plate; 13, sliding column; 14, first rectangular rod; 15, first sliding sleeve; 16, second rectangular rod; 17, reduction motor; 18, fixed rod; 19, second sliding sleeve; 20, U-shaped plate; 21, water storage tank; 22, water outlet cylinder; 23, piston push plate; 24, push rod; 25, connecting plate; 26, rectangular sliding rod; 27, abutting sliding rod; 28, rectangular plate; 29, movable rod; 30, sealing plate. Specific embodiments
[0030] The following is a description of the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not used to limit the present invention.
[0031] Embodiment: A photovoltaic building curtain wall with self-cleaning function, including a main frame plate 1, a photovoltaic solar panel is laid on the front surface of the main frame plate 1, grooves are provided on both sides of the main frame plate 1, movable plates 2 are arranged inside the grooves of the main frame plate 1, a cleaning mechanism is arranged between the two movable plates 2, the cleaning mechanism includes a rotating rod 3 rotatably connected between the two movable plates 2, a cylindrical cam 4 is coaxially and fixedly connected to the outer wall of the middle part of the rotating rod 3, a telescopic sliding rod 5 is slidably connected inside the curve chute of the cylindrical cam 4, the other end of the telescopic sliding rod 5 is fixedly connected to an intermediate plate 6, four spring rods 8 are symmetrically and fixedly connected to the side of the intermediate plate 6 close to the main frame plate 1, the other ends of the four spring rods 8 are fixedly connected to the same cleaning plate 9, and a cleaning cloth is fixedly connected to the side of the cleaning plate 9 close to the main frame plate 1;
[0032] A reduction motor 17 is installed on the side of one of the movable plates 2 , and the output shaft of the reduction motor 17 is coaxially fixedly connected to the rotating rod 3 .
[0033] like Figure 1-Figure 3 As shown, the reduction motor 17 needs to be electrically connected to the external controller, and the external controller further controls the reduction motor 17 to start, the reduction motor 17 drives the rotating rod 3 to rotate, the rotating rod 3 drives the cylindrical cam 4 to rotate, the rotating cylindrical cam 4 drives the telescopic slide rod 5 to move back and forth through the curved slide groove, the middle plate 6 moves back and forth synchronously with the telescopic slide rod 5, and further drives the cleaning plate 9 to move back and forth, and the cleaning cloth on the cleaning plate 9 wipes the photovoltaic building curtain wall.
[0034] The same spray mechanism is installed on the two movable plates 2, and the spray mechanism includes a water tank 21 fixedly connected to the bottom surfaces of the two movable plates 2, and a plurality of water outlet cylinders 22 are fixedly installed on one side of the water tank 21 close to the main frame plate 1, and a through hole is provided at one end of the water outlet cylinder 22 located inside the water tank 21, and the end of the water outlet cylinder 22 extending to the outside of the water tank 21 is connected to a spray head, and the inner wall of the water outlet cylinder 22 is sealingly and slidably connected to a piston push plate 23 with a through hole on the surface, one side of the piston push plate 23 is coaxially fixedly connected to a push rod 24, and the other side of the piston push plate 23 is hinged with a sealing plate 30 for closing the through hole on the surface of the piston push plate 23. In order to improve the sealing effect of the sealing plate 30, a sealing rubber layer can be provided on the contact surface between the sealing plate 30 and the piston push plate 23.
[0035] One end of the water outlet cylinder 22 to which the plurality of push rods 24 extend is fixedly connected to the same connecting plate 25, and the other side of the connecting plate 25 is fixedly connected to a rectangular sliding rod 26, and the rectangular sliding rod 26 extends through and extends to the outside of the water storage tank 21, and one end thereof is fixedly connected to a resisting sliding rod 27, and the rectangular sliding rod 26 is sealingly and slidably connected to the water storage tank 21;
[0036] A slide rail is fixedly connected to the side of the water tank 21, and a rectangular plate 28 is slidably connected to the slide rail. An inclined interference groove is provided on the rectangular plate 28, and the interference slide rod 27 can be slidably connected inside the interference groove of the rectangular plate 28. A movable rod 29 is fixedly connected to the top surface of the rectangular plate 28, and the other end of the movable rod 29 is slidably connected inside the curved groove of the cylindrical cam 4.
[0037] It should be noted that the water storage tank 21 is connected to the external water inlet pipe. Figure 5 , Figure 8 and Fig. 9For reference, the curved slide groove of the cylindrical cam 4 can also drive the movable rod 29 to move back and forth, and the movable rod 29 drives the rectangular plate 28 to move back and forth horizontally. Through the cooperation between the resistance slide groove of the rectangular plate 28 and the resistance slide rod 27, the rectangular slide rod 26 will make vertical reciprocating movements. During the downward movement of the rectangular slide rod 26, the connecting plate 25 and the push rod 24 move downward, and the piston push plate 23 moves downward synchronously with the push rod 24. At this time, the sealing plate 30 closes the through hole on the surface of the piston push plate 23, and the water in the water outlet cylinder 22 is sprayed from the nozzle to the surface of the photovoltaic building curtain wall for preliminary flushing.
[0038] During the upward movement of the rectangular slide bar 26, the connecting plate 25 and the push rod 24 move upward, and the piston push plate 23 moves upward synchronously with the push rod 24. At this time, the sealing plate 30 opens, the through hole on the surface of the piston push plate 23 is opened, and the water inside the water tank 21 enters the water outlet cylinder 22, and further the water passes through the through hole of the piston push plate 23.
[0039] A pressure mechanism is installed on the rotating rod 3, and the pressure mechanism includes two spur gears 10 coaxially fixedly connected to the rotating rod 3, the two spur gears 10 are symmetrical about the cylindrical cam 4, and three circular ring plates 11 are equidistantly and coaxially fixedly connected to the outer side surface of the spur gear 10, and the three circular ring plates 11 form an internal slide groove and an external slide groove. An inclined notch is opened on the circular ring plate 11 in the middle position, and two guide slide plates 12 are rotatably connected to the inclined notch of the circular ring plate 11 through a torsion spring. A sliding column 13 is slidably connected inside the inclined notch of the circular ring plate 11, and a first rectangular rod 14 is fixedly connected to the outer end of the sliding column 13, and a first sliding sleeve 15 is fixedly connected to the other end of the first rectangular rod 14, and a second rectangular rod 16 is slidably connected inside the first sliding sleeve 15.
[0040] It should be noted that under normal conditions, the inclination angle and rotation direction of the guide slide 12 on one of the spur gears 10 are as follows: Figure 6 As shown, Figure 6 From the main perspective, the rotating rod 3 drives the spur gear 10 to rotate counterclockwise, and the sliding column 13 passes through the guide slide 12 in the inner slide to guide from the inner slide into the outer slide. Because when the sliding column 13 passes through the guide slide 12 inside the outer slide, the guide slide 12 will rotate to close the inclined gap, and then the sliding column 13 will continue to slide inside the outer slide. At the same time, the spur gear 10 rotates in the opposite direction, and the sliding column 13 will return to the inner slide and continue to slide in the inner slide.
[0041] At this time Figure 7 From the main perspective, the inclination angle and rotation direction of the guide slide 12 on the other spur gear 10 are as follows: Figure 7 As shown, and Figure 7Taking the main perspective, the spur gear 10 rotates clockwise. The sliding column 13 is guided by the guiding slide plate 12 inside the internal slideway and enters the external slideway from the internal slideway. When the sliding column 13 passes through the guiding slide plate 12 inside the external slideway, it will cause the guiding slide plate 12 to rotate, closing the inclined notch. Subsequently, the sliding column 13 will keep sliding inside the external slideway. At the same time, the spur gear 10 rotates in the reverse direction, and the sliding column 13 will return to the internal slideway and keep sliding inside the internal slideway.
[0042] Furthermore, the position of the first rectangular rod 14 is moved through the sliding column 13, thereby prompting the intermediate plate 6 to approach the photovoltaic solar panel, squeezing the spring rod 8. The spring rod 8 will exert pressure on the cleaning plate 9, making the cleaning cloth wipe the photovoltaic building curtain wall cleaner.
[0043] A positioning slide rod 7 is fixedly connected between the upper and lower bottom surfaces of the groove of the main frame plate 1. The positioning slide rod 7 is slidably connected with the movable plate 2.
[0044] As Figure 1 and Figure 2 shown, the positioning slide rod 7 can limit the movement of the movable plate 2.
[0045] A fixing rod 18 is fixedly connected to the inner side surface of the movable plate 2. The other end of the fixing rod 18 is fixedly connected with a second sliding sleeve 19. The second sliding sleeve 19 is slidably connected with the first rectangular rod 14.
[0046] As Figure 4 shown, the movement of the first rectangular rod 14 is limited by the fixing rod 18 and the second sliding sleeve 19, and the movement of the second rectangular rod 16 can be limited by the first sliding sleeve 15.
[0047] The second rectangular rod 16 is fixedly connected to the side surface of the intermediate plate 6. The other end of the second rectangular rod 16 is fixedly connected with a baffle to prevent the second rectangular rod 16 from slipping off the first sliding sleeve 15.
[0048] Two U-shaped plates 20 are symmetrically and fixedly connected to the front surface of the main frame plate 1. A straight rack is fixedly connected to the inner side of the U-shaped plate 20 opposite to the main frame plate 1, and the straight rack meshes with the spur gear 10.
[0049] As Figure 1 and Figure 4 shown, through the cooperation between the straight rack and the spur gear 10, the movable plate 2 moves downward, and the cleaning mechanism, the spraying mechanism, and the pressing mechanism move downward synchronously. When the spur gear 10 rotates in the reverse direction, it can drive the movable plate 2 to move upward.
[0050] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A photovoltaic building curtain wall with a self-cleaning function, comprising a main frame plate (1), a photovoltaic solar panel being laid on the front of the main frame plate (1), characterized in that: Both sides of the main frame plate (1) are provided with grooves. An activity plate (2) is arranged inside the grooves of the main frame plate (1). A cleaning mechanism is arranged between the two activity plates (2). The cleaning mechanism includes a rotating rod (3) rotatably connected between the two activity plates (2). A cylindrical cam (4) is coaxially and fixedly connected to the outer wall of the middle part of the rotating rod (3). A telescopic sliding rod (5) is slidably connected inside the curve chute of the cylindrical cam (4). The other end of the telescopic sliding rod (5) is fixedly connected with an intermediate plate (6). Four spring rods (8) are symmetrically and fixedly connected to one side of the intermediate plate (6) close to the main frame plate (1). The other ends of the four spring rods (8) are fixedly connected with the same cleaning plate (9). A cleaning cloth is fixedly connected to one side of the cleaning plate (9) close to the main frame plate (1). A pressing mechanism is installed on the rotating rod (3). The pressing mechanism includes two spur gears (10) coaxially and fixedly connected to the rotating rod (3). The two spur gears (10) are symmetric about the cylindrical cam (4). Three ring plates (11) are coaxially and fixedly connected to the outer side of the spur gear (10) at equal intervals. The three ring plates (11) form an inner chute and an outer chute. An inclined notch is opened on the ring plate (11) in the middle position. Two guiding sliding plates (12) are rotatably connected to the inclined notch of the ring plate (11) through a torsion spring. A sliding column (13) is slidably connected inside the inclined notch of the ring plate (11). The outer end of the sliding column (13) is fixedly connected with a first rectangular rod (14). The other end of the first rectangular rod (14) is fixedly connected with a first sliding sleeve (15). A second rectangular rod (16) is slidably connected inside the first sliding sleeve (15).
2. The photovoltaic building curtain wall with self-cleaning function according to claim 1, characterized in that: A positioning sliding rod (7) is fixedly connected between the upper and lower bottom surfaces of the groove of the main frame plate (1). The positioning sliding rod (7) is slidably connected with the activity plate (2).
3. The photovoltaic building curtain wall with self-cleaning function according to claim 1, characterized in that: A reduction motor (17) is installed on the side surface of one of the activity plates (2). The output shaft of the reduction motor (17) is coaxially and fixedly connected with the rotating rod (3).
4. The photovoltaic building curtain wall with self-cleaning function according to claim 1, characterized in that: A fixed rod (18) is fixedly connected to the inner side surface of the activity plate (2). The other end of the fixed rod (18) is fixedly connected with a second sliding sleeve (19). The second sliding sleeve (19) is slidably connected with the first rectangular rod (14).
5. The photovoltaic building curtain wall with self-cleaning function according to claim 1, characterized in that: The second rectangular rod (16) is fixedly connected to the side surface of the intermediate plate (6). A baffle is fixedly connected to the other end of the second rectangular rod (16).
6. The photovoltaic building curtain wall with self-cleaning function according to claim 1, characterized in that: Two U-shaped plates (20) are symmetrically and fixedly connected to the front surface of the main frame plate (1). A straight rack is fixedly connected to the inner side of the U-shaped plate (20) opposite to the main frame plate (1). The straight rack is engaged with the spur gear (10).
7. The photovoltaic building curtain wall with self-cleaning function according to claim 1, characterized in that: The two movable plates (2) are provided with a same spray mechanism, the spray mechanism comprising a water tank (21) fixedly connected to the bottom surfaces of the two movable plates (2), a plurality of water outlet cylinders (22) are fixedly installed on one side of the water tank (21) close to the main frame plate (1), and a through hole is provided at one end of the water outlet cylinder (22) located inside the water tank (21), and a spray head is connected to one end of the water outlet cylinder (22) extending to the outside of the water tank (21), the inner wall of the water outlet cylinder (22) is sealingly and slidably connected to a piston push plate (23) with a through hole on the surface, one side of the piston push plate (23) is coaxially and fixedly connected to a push rod (24), and the other side of the piston push plate (23) is hinged to a sealing plate (30) for closing the through hole on the surface of the piston push plate (23).
8. The photovoltaic building curtain wall with self-cleaning function according to claim 7, characterized in that: One end of the water outlet cylinder (22) to which the plurality of push rods (24) extend is fixedly connected to a same connecting plate (25), and the other side of the connecting plate (25) is fixedly connected to a rectangular sliding rod (26). The rectangular sliding rod (26) extends through and to the outside of the water storage tank (21), and one end is fixedly connected to a resisting sliding rod (27), and the rectangular sliding rod (26) is sealingly slidably connected to the water storage tank (21); A slide rail is fixedly connected to the side of the water storage tank (21), a rectangular plate (28) is slidably connected to the slide rail, an inclined abutting slide groove is provided on the rectangular plate (28), the abutting slide rod (27) can be slidably connected inside the abutting slide groove of the rectangular plate (28), a movable rod (29) is fixedly connected to the top surface of the rectangular plate (28), and the other end of the movable rod (29) is slidably connected inside the curved slide groove of the cylindrical cam (4).
Citation Information
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Photovoltaic base station solar panel cleaning device
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