Solar cell screen wiping mechanism, device, system and method

Abstract

The invention relates to a solar cell screen wiping mechanism, device, system and method. The wiping mechanism comprises a supporting block and two cloth clamping rods which are rotationally connected and arranged on the two sides of the supporting block respectively. And an elastic element for limiting the rotation of the cloth clamping rods is arranged between the two cloth clamping rods. A motor arranged on an existing wiping head is omitted to reduce the weight of the wiping mechanism, the moving speed of the moving mechanism can be increased, the wiping and cleaning time is shortened, and the downtime is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cell production, and in particular to a screen wiping mechanism, device, system and method for solar cells. Background Art

[0002] In the production process of solar cells, the grid lines on the cells are a key process. Currently, the grid lines are printed on the cells by screen printing technology using silver paste. When the screen clogs during printing, resulting in broken grid lines, manual wiping is required. The wiping interval is generally 15 minutes to 30 minutes. Manual wiping has certain safety hazards and the equipment cannot operate without human presence.

[0003] Currently, the Chinese invention patent (CN220554802U) discloses a screen wiping head for photovoltaic cells to solve the problem of manual wiping. The screen wiping head for photovoltaic cells disclosed in the above patent includes: a base, a motor, a pressure sensor, and a dust-free cloth fixing seat. The motor and the pressure sensor are both fixed on the base. There are two motors arranged at intervals, the pressure sensor is arranged between the two motors, and the dust-free cloth fixing seat is fixed on the output shaft of the motor.

[0004] As can be seen from the above, the screen wiping head for photovoltaic cells contains a motor, a cloth roll, and a support structure, resulting in limited movement speed of the robotic arm, longer cleaning time for screen wiping, and longer stopping time for cell printing.

[0005] Therefore, it is necessary to propose a screen wiping device for solar cells to at least partially solve the problems existing in the prior art. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention discloses a screen wiping mechanism, device, system and method for solar cells.

[0007] The technical solutions adopted by the present invention are as follows: In the first aspect, a screen wiping mechanism for solar cells is provided, including: a support block, and two clamping rods rotatably connected and respectively arranged on both sides of the support block; an elastic element for restricting the rotation of the clamping rods is arranged between the two clamping rods.

[0008] In an embodiment of the present invention, the clamping rod includes a clamping head, a connecting portion, and a handle body portion; the connecting portion is bent and arranged between the clamping head and the handle body portion; the clamping head, the handle body portion, and the support block are arranged in parallel; wherein, a clamping cloth rotating shaft is arranged at the overlapping portion of the connecting portions of the two clamping rods.

[0009] In an embodiment of the present invention, it further includes a sliding module, an elastic gasket, a force sensor, and a support base; the elastic gasket is arranged on the support block; the movable part of the sliding module is connected to the support block, and the fixed part of the sliding module is fixedly arranged on the support base; the support block is arranged above the force sensor; the force sensor is fixed to the support base.

[0010] In a second aspect, a solar cell screen wiping device is provided, including: A moving mechanism having a free end and capable of performing multi-axis movement; The solar cell screen wiping mechanism as described above is connected to the free end of the moving mechanism; A clean cloth supply mechanism includes a clean cloth roll, a multi-axis movement mechanism, a clean cloth clamping module connected to the multi-axis movement mechanism, a transmission module, a first support plate and a second support plate respectively arranged on both sides of the transmission module, and a cutter arranged between the first support plate and the second support plate; the transmission module conveys the clean cloth unrolled from the clean cloth roll to the clean cloth clamping module, and the cutter cuts the clean cloth; A spreading mechanism includes a spreading power source and a spreading block connected to the acting end of the spreading power source; the spreading block is used to spread and move the cloth clamping rod away from the support block.

[0011] In an embodiment of the present invention, the clean cloth clamping module includes a clamping power source and two clamps connected to the acting end of the clamping power source; the two clamps move relatively closer or farther away under the action of the clamping power source.

[0012] In an embodiment of the present invention, the transmission module includes a driving wheel and a driven wheel respectively arranged above and below the clean cloth; both the driving wheel and the driven wheel are in frictional transmission with the clean cloth.

[0013] In an embodiment of the present invention, the multi-axis movement mechanism includes an X-axis linear module, a Y-axis linear module, and a Z-axis linear module; the fixed part of the X-axis linear module is arranged on the movable part of the Y-axis linear module; the fixed part of the Z-axis linear module is arranged on the movable part of the X-axis linear module; the clean cloth clamping module is arranged on the movable part of the Z-axis linear module.

[0014] In an embodiment of the present invention, it further includes a clean cloth recycling mechanism for recycling the dirty clean cloth; the clean cloth recycling mechanism includes a rotary drive source, a connecting member connected to the rotary part of the rotary drive source, and a suction cup arranged on the connecting member; the suction cup is used to adsorb the dirty clean cloth.

[0015] In a third aspect, a solar cell screen wiping system is provided, including: The screen wiping device for solar cell wafers as described above; A rotating platform for loading solar cell wafers.

[0016] In a fourth aspect, a method for wiping a screen of a solar cell wafer is provided, which uses the above-mentioned screen wiping device for solar cell wafers and includes the following steps: S1. When the dust-free cloth of the dust-free cloth roll is conveyed by the driving wheel and the driven wheel to the dust-free cloth clamping module, the dust-free cloth clamping module clamps the dust-free cloth, and the cutter cuts off the dust-free cloth; S2. The moving mechanism moves the screen wiping mechanism for solar cell wafers under the dust-free cloth in step S1. The spreading power source toggles the spreading block, and the spreading block spreads the two cloth clamping rods. The dust-free cloth clamping module places the dust-free cloth section above the support block; when the spreading block does not act on the two cloth clamping rods 201, the two cloth clamping rods clamp the dust-free cloth under the action of the elastic element; S3. The moving mechanism drives the screen wiping mechanism for solar cell wafers to move under the screen of the solar cell wafer, and the dust-free cloth wipes the screen of the solar cell wafer; S4. After wiping the screen of the solar cell wafer, the moving mechanism moves the screen wiping mechanism for solar cell wafers under the suction cup of the dust-free cloth recycling mechanism. The suction cup sucks the dust-free cloth, the spreading block spreads the two cloth clamping rods respectively, and the rotation driving source transports the dirty dust-free cloth section to the recycling area.

[0017] The above technical solution of the present invention has the following advantages compared with the prior art: The screen wiping mechanism for solar cell wafers of the present invention cancels the motor configured in the existing wiping head to reduce the weight of the wiping mechanism, which can improve the moving speed of the robotic arm, shorten the wiping and cleaning time, and reduce the downtime.

[0018] At the same time, the screen wiping device for solar cell wafers of the present invention uses a section of dust-free cloth to replace the cloth roll to further reduce the weight of the wiping mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the present invention easier to be clearly understood, the present invention will be further described in detail below according to the specific embodiments of the present invention in conjunction with the drawings.

[0020] Figure 1 It is a schematic structural view of the wiping mechanism in the first perspective of the present invention.

[0021] Figure 2 It is a schematic structural view of the wiping mechanism in the second perspective of the present invention.

[0022] Figure 3 It is a schematic structural view of the cloth clamping rod and the rotating shaft in the present invention.

[0023] Figure 4It is a schematic structural diagram of the solar cell screen wiping device in the present invention.

[0024] Figure 5 It is a schematic structural diagram of the robotic arm and the wiping mechanism in the present invention.

[0025] Figure 6 It is a schematic structural diagram of the dust-free cloth supply mechanism, the spreading mechanism and the dust-free cloth recycling mechanism in the present invention.

[0026] Figure 7 It is the front view of the dust-free cloth supply mechanism in the present invention.

[0027] Figure 8 It is a schematic diagram of the usage state of the solar cell screen wiping device in the present invention.

[0028] Explanation of the reference numerals in the specification drawings: 10. Robotic arm; 101. Extension arm; 20. Wiping mechanism; 201. Cloth clamping rod; 2011. Clamping head; 2012. Connecting part; 2013. Handle body part; 202. Support block; 203. Cloth clamping rotating shaft; 204. Sliding module; 205. Elastic element; 206. Elastic gasket; 207. Force sensor; 208. Support seat; 30. Dust-free cloth supply mechanism; 301. Dust-free cloth roll; 302. First support plate; 303. Driving wheel; 304. Driven wheel; 305. Cutting knife; 306. Second support plate; 307. First dust-free cloth clamping module; 3071. First clamp; 3072. Second clamp; 3073. First clamping power source; 308. Second dust-free cloth clamping module; 3081. Third clamp; 3082. Fourth clamp; 3083. Second clamping power source; 40. Spreading mechanism; 401. First spreading power source; 402. First spreading block; 403. Second spreading power source; 404. Second spreading block; 50. Dust-free cloth recycling mechanism; 501. Rotary drive source; 502. Connecting piece; 503. Suction cup; 60. Recycling box; 70. Rotary platform; 80. Solar cell screen. Detailed implementation manners

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments cited are not intended to limit the present invention.

[0030] Regarding the foregoing and other technical contents, features, and effects of the present invention, they will be clearly presented in the following detailed description of the embodiments with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front, or rear, etc., are only with reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustration and not for limiting the present invention. In addition, in all embodiments, the same reference numerals represent the same elements.

[0031] Referring to Figure 4 As shown, a screen wiping device for solar cell wafers includes a moving mechanism, a wiping mechanism 20, a dust-free cloth supply mechanism 30, a spreading mechanism 40, a dust-free cloth recycling mechanism 50, and a recycling box 60. The moving mechanism drives the wiping mechanism 20 to perform multi-axis movement. The dust-free cloth supply mechanism 30 provides a certain length of dust-free cloth. The spreading mechanism 40 spreads the wiping part of the wiping mechanism 20 to carry the dust-free cloth. The dust-free cloth recycling mechanism 50 recovers the dirty dust-free cloth from the wiping mechanism 20. The recycling box 60 collects the dirty dust-free cloth.

[0032] It should be noted that the wiping mechanism 20 is the screen wiping mechanism for solar cell wafers.

[0033] Among them, in combination with Figure 5 , the moving mechanism has a free end and can perform multi-axis movement. Specifically, the moving mechanism includes a robotic arm 10. The free end of the robotic arm 10 is connected to the wiping mechanism 20. Alternatively, the moving mechanism further includes a robotic arm 10 and an extension arm 101. The free end of the robotic arm 10 is connected to one end of the extension arm 101. The other end of the extension arm 101 is connected to the wiping mechanism 20. It can be understood that the moving mechanism is composed of six degrees of freedom including X-axis movement, Y-axis movement, Z-axis movement, X-axis rotation, Y-axis rotation, and Z-axis rotation, and can reach any coordinate point in space.

[0034] In combination with Figures 1 to 3 , the wiping mechanism 20 is connected to the free end of the moving mechanism, that is, the wiping mechanism 20 is connected to the free end of the robotic arm 10 or the wiping mechanism 20 is connected to the extension arm 101.

[0035] The wiping mechanism 20 includes a support block 202, two clamping cloth rods 201 that are rotatably connected and respectively arranged on both sides of the support block 202, a sliding module 204, an elastic gasket 206, a force sensor 207, and a support base 208. An elastic element 205 for restricting the rotation of the clamping cloth rod 201 is arranged between the two clamping cloth rods 201. The elastic gasket 206 is arranged on the support block 202. The movable part of the sliding module 204 is connected to the support block 202, and the fixed part of the sliding module 204 is fixedly arranged on the support base 208. The support block 202 is arranged above the force sensor 207. The force sensor 207 is fixed to the support base 208. The support base 208 is fixedly connected to the moving mechanism. The force sensor 207 detects the pressure of the support block 202 when wiping the solar cell screen 80 to prevent overloading and damaging the solar cell screen 80. Therefore, the subsequent dust-free cloth can be directly placed on the elastic gasket 206.

[0036] Specifically, as Figure 3 shown, the clamping cloth rod 201 includes a clamping head part 2011, a connecting part 2012, and a handle body part 2013. The connecting part 2012 is bent and arranged between the clamping head part 2011 and the handle body part 2013. The clamping head part 2011 and the handle body part 2013 are arranged parallel to the support block 202. Among them, a clamping cloth rotating shaft 203 is arranged at the overlapping part of the connecting parts 2012 of the two clamping cloth rods 201.

[0037] Furthermore, the clamping head part 2011, the connecting part 2012, and the handle body part 2013 are integrally formed, so that the clamping cloth rod 201 has no splicing gap, the overall structure is more stable, can bear greater force, and is not easy to break or loosen during use, thereby extending the service life of the clamping cloth rod 201.

[0038] The sliding module 204 provides a free movement space for the support block 202 in the vertical direction. The sliding module 204 includes a slider and a guide rail. The mounting surface of the slider is fixed to the support base 208, and the guide rail is fixedly connected to the support block 202 in the vertical direction.

[0039] The elastic element 205 is a tension spring. The tension spring is horizontally arranged between the two clamping cloth rods 201, and both ends of the tension spring are respectively connected to the two clamping cloth rods 201. When an external force acts on the two clamping cloth rods 201, the two clamping cloth rods 201 rotate around the clamping cloth rotating shaft 203, and the parts of the two clamping cloth rods 201 close to the dust-free cloth open and move away from the support block 202, and the tension spring is stretched; when the external force does not act on the two clamping cloth rods 201, the tension spring returns to its initial shape, and the parts of the two clamping cloth rods 201 close to the dust-free cloth close and fit the support block 202.

[0040] Combined Figure 6 and Figure 7, the dust-free cloth supply mechanism 30 includes a dust-free cloth roll 301, a multi-axis motion mechanism, a dust-free cloth clamping module connected to the multi-axis motion mechanism, a transmission module, a first support plate 302 and a second support plate 306 respectively disposed on both sides of the transmission module, and a cutting knife 305 disposed between the first support plate 302 and the second support plate 306. The transmission module conveys the dust-free cloth unrolled from the dust-free cloth roll 301 to the dust-free cloth clamping module, and the cutting knife 305 cuts the dust-free cloth.

[0041] Specifically, the dust-free cloth clamping module includes a clamping power source and two clamps connected to the acting ends of the clamping power source. The two clamps approach or move away from each other under the action of the clamping power source. As Figure 5 shown, in this embodiment, a first dust-free cloth clamping module 307 and a second dust-free cloth clamping module 308 are provided. The first dust-free cloth clamping module 307 includes a first clamping power source 3073, a first clamp 3071 and a second clamp 3072. The first clamp 3071 and the second clamp 3072 are respectively connected to the acting ends of the first clamping power source 3073. The second dust-free cloth clamping module 308 includes a second clamping power source 3083, a third clamp 3081 and a fourth clamp 3082. The third clamp 3081 and the fourth clamp 3082 are respectively connected to the acting ends of the second clamping power source 3083. Among them, the first clamping power source 3073 and the second clamping power source 3083 can be pneumatic grippers, and those skilled in the art can select and adjust the models of the pneumatic grippers according to needs.

[0042] The transmission module includes a driving wheel 303 and a driven wheel 304 respectively disposed above and below the dust-free cloth. Both the driving wheel 303 and the driven wheel 304 are in frictional transmission with the dust-free cloth. Among them, the driving wheel 303 is equipped with an independent driving source such as a servo motor, and the output end of the servo motor is connected to the driving wheel 303. The driving wheel 303 is driven by a servo motor or other power sources, and drives the dust-free cloth through friction when rotating. The driven wheel 304 is in contact with the dust-free cloth and is driven to rotate by the friction of the dust-free cloth. The dust-free cloth is a flexible material and plays a role in transmitting power.

[0043] The multi-axis motion mechanism includes an X-axis linear module, a Y-axis linear module and a Z-axis linear module. The fixed part of the X-axis linear module is disposed on the movable part of the Y-axis linear module. The fixed part of the Z-axis linear module is disposed on the movable part of the X-axis linear module. The dust-free cloth clamping module is disposed on the movable part of the Z-axis linear module.

[0044] Further, to enable the drive module to better convey the unwound non-woven fabric of the non-woven fabric roll 301 to the non-woven fabric clamping module, the non-woven fabric supply mechanism 30 further includes a first support plate 302 and a second support plate 306. The first support plate 302 and the second support plate 306 can provide a flat support surface for the fabric to prevent the non-woven fabric from wrinkling, twisting or sagging during transportation. The first support plate 302 is disposed between the non-woven fabric roll 301 and the drive module, and the second support plate 306 is disposed outside the cutting knife 305.

[0045] It should be noted that a support plate is also provided at the position corresponding to the cutting knife 305 to provide stable support for the non-woven fabric to be cut and ensure that the non-woven fabric remains flat and fixed during cutting. The support plate can effectively prevent the non-woven fabric from shifting or deforming during cutting.

[0046] The spreading mechanism 40 includes a spreading power source and a spreading block connected to the acting end of the spreading power source. The spreading block is used to spread and move the cloth clamping rod 201 away from the support block 202.

[0047] Specifically, corresponding to the two cloth clamping rods 201, this embodiment is provided with a first spreading power source 401, a first spreading block 402, a second spreading power source 403 and a second spreading block 404. The acting end of the first spreading power source 401 is connected to the first spreading block 402. The acting end of the second spreading power source 403 is connected to the second spreading block 404. The first spreading block 402 and the second spreading block 404 are provided with accommodation grooves along their respective lengths, and the shape of the accommodation grooves matches that of the cloth clamping rod 201.

[0048] The non-woven fabric recycling mechanism 50 includes a rotary drive source 501, a connecting member 502 connected to the rotating part of the rotary drive source 501, and a suction cup 503 provided on the connecting member 502. The suction cup 503 is used to adsorb the dirty non-woven fabric. Among them, the rotary drive source 501 can be a rotary cylinder, and the connecting member 502 can be a plate member.

[0049] Combined Figure 1 and Figure 8 , the working principle of the present invention is as follows: A plurality of solar cells are placed on the rotary platform 70. When an abnormality of the cell is detected by vision, the printing press stops printing, the solar cell screen 80 is lifted, and the robotic arm 10 drives the wiping mechanism 20 to move below the solar cell screen 80, and the non-woven fabric wipes the solar cell screen 80.

[0050] The non-woven fabric of the non-woven fabric roll 301 is conveyed by the driving wheel 303 and the driven wheel 304 to Figure 6 the right side in . The rotation angle of the driving wheel 303 is detected by a rotary encoder (not shown in the figure), and the conveying length of the non-woven fabric can be measured.

[0051] When the dust-free cloth is conveyed to the location of the first dust-free cloth clamping module 307 and the second dust-free cloth clamping module 308, the first dust-free cloth clamping module 307 and the second dust-free cloth clamping module 308 clamp the dust-free cloth, and the cutting knife 305 cuts off the dust-free cloth.

[0052] The robotic arm 10 moves the wiping mechanism 20 under the dust-free cloth. The first expanding power source 401 toggles the first expanding block 402, and the second expanding power source 403 toggles the second expanding block 404. The first expanding block 402 and the second expanding block 404 respectively expand the two cloth clamping rods 201. The first dust-free cloth clamping module 307 and the second dust-free cloth clamping module 308 place the dust-free cloth section above the elastic gasket 206. The first expanding block 402 and the second expanding block 404 do not act on the two cloth clamping rods 201, and the cloth clamping rods 201 clamp the dust-free cloth to ensure that the dust-free cloth does not separate from the elastic gasket 206 when wiping the solar cell screen 80.

[0053] After wiping the solar cell screen 80, the robotic arm 10 moves the wiping mechanism 20 under the suction cup 503 of the dust-free cloth recycling mechanism 50. The suction cup 503 sucks the dust-free cloth. The first expanding block 402 and the second expanding block 404 respectively expand the two cloth clamping rods 201, and the rotation drive source 501 transports the dirty dust-free cloth section to the recycling bin 60.

[0054] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if the terms "set" and "connect" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0055] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A screen wiping mechanism for solar cell wafers, characterized in that, Comprising: A support block (202), and two cloth clamping rods (201) that are rotatably connected and respectively arranged on both sides of the support block (202); an elastic element (205) for restricting the rotation of the cloth clamping rods (201) is arranged between the two cloth clamping rods (201).

2. The screen wiping mechanism for solar cell wafers according to claim 1, wherein The cloth clamping rod (201) includes a clamping head (2011), a connecting portion (2012), and a handle body portion (2013); the connecting portion (2012) is bent and arranged between the clamping head (2011) and the handle body portion (2013); the clamping head (2011) and the handle body portion (2013) are arranged parallel to the support block (202); wherein, a cloth clamping rotating shaft (203) is arranged at the overlapping portion of the connecting portions (2012) of the two cloth clamping rods (201).

3. The screen wiping mechanism for solar cell wafers according to claim 1, characterized in that, It further includes a sliding module (204), an elastic gasket (206), a force sensor (207), and a support seat (208); the elastic gasket (206) is arranged on the support block (202); the movable portion of the sliding module (204) is connected to the support block (202), and the fixed portion of the sliding module (204) is fixedly arranged on the support seat (208); the support block (202) is arranged above the force sensor (207); the force sensor (207) is fixed to the support seat (208).

4. A screen wiping device for solar cell wafers, characterized in that, Comprising: A moving mechanism having a free end and capable of performing multi-axis movement; The solar cell screen wiping mechanism according to any one of claims 1-3, which is connected to the free end of the moving mechanism; A dust-free cloth supply mechanism (30), including a dust-free cloth roll (301), a multi-axis movement mechanism, a dust-free cloth clamping module connected to the multi-axis movement mechanism, a transmission module, a first support plate (302) and a second support plate (306) respectively arranged on both sides of the transmission module, and a cutting knife (305) arranged between the first support plate (302) and the second support plate (306); the transmission module conveys the dust-free cloth unrolled from the dust-free cloth roll (301) to the dust-free cloth clamping module, and the cutting knife (305) cuts the dust-free cloth; A spreading mechanism (40), including a spreading power source and a spreading block connected to the acting end of the spreading power source; the spreading block is used to spread the cloth clamping rod (201) and move it away from the support block (202).

5. The screen wiping device for solar cells according to claim 4, characterized in that, The dust-free cloth clamping module includes a clamping power source and two clamps connected to the acting ends of the clamping power source; the two clamps move relatively closer or farther away under the action of the clamping power source.

6. The screen wiping device for solar cells according to claim 4, characterized in that, The transmission module includes a driving wheel (303) and a driven wheel (304) respectively arranged above and below the dust-free cloth; both the driving wheel (303) and the driven wheel (304) are in frictional transmission with the dust-free cloth.

7. The screen wiping device for solar cells according to claim 4, wherein The multi-axis movement mechanism includes an X-axis linear module, a Y-axis linear module, and a Z-axis linear module; the fixed portion of the X-axis linear module is arranged on the movable portion of the Y-axis linear module; the fixed portion of the Z-axis linear module is arranged on the movable portion of the X-axis linear module; the dust-free cloth clamping module is arranged on the movable portion of the Z-axis linear module.

8. The screen wiping device for solar cell wafers according to claim 4, wherein, Also included is a dust-free cloth recovery mechanism (50) for recovering dirty dust-free cloth; the dust-free cloth recovery mechanism (50) comprises a rotational drive source (501), a connecting member (502) connected to a rotating portion of the rotational drive source (501), and a suction cup (503) provided on the connecting member (502); the suction cup (503) is used to absorb the dirty dust-free cloth.

9. A screen wiping system for solar cells, characterized in that, include: The solar cell screen wiping device according to any one of claims 4 to 8; Rotating platform for loading solar cells.

10. A method for wiping a screen printing stencil of a solar cell, characterized in that, The solar cell screen wiping device according to claim 8 comprises the following steps: S1, when the dust-free cloth on the dust-free cloth roll (301) is transported to the dust-free cloth clamping module by the driving wheel (303) and the driven wheel (304), the dust-free cloth clamping module clamps the dust-free cloth, and the cutter (305) cuts the dust-free cloth; S2, the moving mechanism moves the solar cell screen wiping mechanism to the bottom of the dust-free cloth in step S1, and the opening power source moves the opening block, so that the opening block opens the two cloth clamping rods (201), and the dust-free cloth clamping module places the dust-free cloth section above the support block (202); when the opening block does not act on the two cloth clamping rods 201, the two cloth clamping rods (201) clamp the dust-free cloth under the action of the elastic element (205); S3, the moving mechanism drives the solar cell screen wiping mechanism to move below the solar cell screen (80), and the dust-free cloth wipes the solar cell screen (80); S4. After wiping the solar cell screen (80), the moving mechanism moves the solar cell screen wiping mechanism to the bottom of the suction cup (503) of the dust-free cloth recovery mechanism (50). The suction cup (503) sucks the dust-free cloth, the spreading block spreads the two cloth clamping rods (201) respectively, and the rotating driving source (501) moves the dirty dust-free cloth segment to the recovery area.

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