A method for detecting the precision of secondary printing of a crystalline silicon solar photovoltaic cell

Abstract

The application discloses a kind of secondary printing precision visual inspection methods of crystalline silicon solar photovoltaic cell, specifically relates to visual inspection technical field, the visual inspection method using visual inspection equipment includes light-shield room, the top of the light-shield room is equipped with detachable cover plate, lifting assembly is equipped on the cover plate, the bottom of the lifting assembly is equipped with multiple detection cameras for shooting image, the top of the cover plate is fixedly provided with wireless communication module and controller, the bottom of the cover plate is fixedly provided with multiple illuminating lamps located in the light-shield room interior.The application forms a relatively closed space by light-shield room, separates external light source, and then illuminates the inside of light-shield room by illuminating lamp, so that the brightness inside light-shield room is constant and controllable, and visual inspection can be carried out inside light-shield room without being disturbed by light in natural environment, improving the detection precision.

Description

Technical Field

[0001] This invention relates to the field of visual inspection technology, specifically to a visual inspection method for the secondary printing accuracy of crystalline silicon solar photovoltaic cells. Background Technology

[0002] Solar energy has attracted attention as a clean and pollution-free renewable energy source, especially given the increasing depletion of fossil fuels and the growing environmental pollution. Solar photovoltaic power generation is the most common and direct use of solar energy.

[0003] Crystalline silicon solar cells are a type of solar cell widely used in the field of photovoltaic power generation. In the production and processing of crystalline silicon solar cells, a layer of metal grid needs to be printed on its surface to form the front grid lines and back electrode.

[0004] To improve printing accuracy, existing technologies use visual inspection techniques to inspect printed crystalline silicon solar cells. For example, the prior art discloses a visual inspection method and apparatus for secondary printing accuracy of crystalline silicon photovoltaic solar cell electrodes, with publication number CN109360794B.

[0005] However, in existing visual inspection equipment, the ambient light intensity is difficult to control when conducting inspections in open environments. The light intensity can easily interfere with the visual inspection results, leading to poor inspection accuracy. Summary of the Invention

[0006] The purpose of this invention is to provide a visual inspection method for the secondary printing accuracy of crystalline silicon solar photovoltaic cells. By isolating the external light source in a shading chamber and then illuminating the interior of the shading chamber with a lighting lamp, the brightness inside the shading chamber becomes constant and controllable. Visual inspection performed inside the shading chamber is not affected by light from the natural environment, thus improving the accuracy of the inspection.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a visual inspection method for the secondary printing accuracy of crystalline silicon solar photovoltaic cells, the specific steps of which are as follows:

[0008] S1: Connect the visual inspection device to a computer wirelessly so that the visual inspection device can be remotely controlled by the computer;

[0009] S2: Preparations before testing;

[0010] S2.1: Adjust the brightness inside the light-shielding chamber of the visual inspection equipment to make the brightness suitable for visual inspection, and maintain this brightness during subsequent inspections to ensure that the ambient brightness remains constant throughout the entire maintenance process;

[0011] S2.2: Calibrate and adjust the visual inspection equipment under the brightness conditions adjusted in S2.1, including adjusting the distance of the captured image, setting the shooting parameters, etc.

[0012] S3: The visual inspection equipment drives the crystalline silicon solar photovoltaic cell after secondary printing to rotate. When it moves to the inspection station, it is inspected. Before moving to the inspection station, it first passes through the printing station to print the crystalline silicon solar photovoltaic cell a second time and dry it.

[0013] S4: The inspection is carried out inside the shaded room of the vision inspection equipment, isolating the light source in the external environment, and the crystalline silicon solar photovoltaic cell is photographed under the brightness environment adjusted in S2.

[0014] S5: The captured image data is remotely transmitted to a computer. The computer can receive the detection data and use its built-in program to analyze the image data, calculate the difference between the second printing and the first printing, and obtain the detection result.

[0015] Furthermore, the visual inspection device includes a light-shielding chamber with a removable cover plate at the top. A lifting assembly is provided on the cover plate, and multiple inspection cameras for capturing images are provided at the bottom of the lifting assembly. The inspection cameras capture images of crystalline silicon solar photovoltaic cells for analysis and visual inspection.

[0016] The top of the cover plate is fixedly equipped with a wireless communication module and a controller. The controller is remotely connected to a computer through the wireless communication module. The detection camera is located at the input end of the controller. The bottom of the cover plate is fixedly equipped with multiple lighting lamps located inside the light-shielding room. The lighting lamps illuminate the inside of the light-shielding room. The lighting lamps are located at the output end of the controller.

[0017] Furthermore, the light-shielding chamber is equipped with a calibration component, which includes an adjustment motor fixedly mounted on the inner wall of the light-shielding chamber. One end of the output shaft of the adjustment motor is fixedly mounted with a fixed shaft, and one end of the fixed shaft is rotatably connected to the inner wall of the light-shielding chamber.

[0018] The calibration assembly also includes an optical calibration plate. Two internal electric push rods are provided between the optical calibration plate and the fixed shaft. The two ends of the internal electric push rods are fixedly connected to the optical calibration plate and the fixed shaft, respectively. A light sensor for sensing ambient brightness is fixedly provided at the outer end of the optical calibration plate. The light sensor is located at the input end of the controller, and the adjustment motor is located at the output end of the controller.

[0019] Furthermore, the lifting assembly includes a mounting plate located inside the light-shielding chamber, all detection cameras are located at the bottom end of the mounting plate, and multiple telescopic rods are provided between the mounting plate and the cover plate, with both ends of the telescopic rods fixedly connected to the cover plate and the mounting plate respectively;

[0020] A screw rod is fixedly provided on the cover plate, passing through the cover plate and movably connected to the cover plate via a bearing. A handwheel is fixedly provided at the top end of the screw rod, and a sliding frame is threaded onto the outer end of the screw rod. The sliding frame is fixedly provided on the top end of the mounting plate.

[0021] Furthermore, a testing platform is fixedly provided at the bottom of the light-shielding chamber, a support frame is fixedly provided at the bottom of the testing platform, a load-bearing frame is fixedly provided at the front end of the testing platform, a rotating platform is provided at the top of the load-bearing frame, a tray is fixedly provided on the inner wall of the light-shielding chamber, the front end of the tray extends to the front side of the light-shielding chamber, a calibration component is provided above the tray, and the top end of the tray is flush with the top end of the rotating platform.

[0022] Furthermore, a drive motor for driving the rotary table to rotate is fixed on the inner wall of the load-bearing frame. The drive motor is located at the output end of the controller, and a plurality of ball bearings that contact the top of the load-bearing frame are fixed at the bottom of the rotary table.

[0023] Furthermore, a central platform is fixedly provided at the center of the top of the rotary table, and multiple printing components are provided at the outer end of the central platform. Each printing component includes an external electric push rod fixedly provided at the outer end of the central platform, and the external electric push rod is provided at the output end of the controller.

[0024] One end of the external electric push rod is fixedly equipped with a printing platform. Two rollers are rotatably connected to both sides of the printing platform. The rollers can bear the weight of the printing platform and are in contact with the top of the rotating table.

[0025] Furthermore, two closed doors are symmetrically arranged at the opening on the front side of the light-shielding chamber. Two semi-circular grooves are opened at the outer end of the closed doors. When the two closed doors are closed, the two semi-circular grooves can be merged into a circular hole, which can fit onto the outer end of the outer electric push rod.

[0026] A linear motor is fixedly installed at the top of the cover plate. The linear motor is located at the output end of the controller. The linear motor has two movers, and each mover has a connecting arm. One end of each connecting arm is fixedly connected to two closed doors, thereby controlling the opening and closing of the closed doors.

[0027] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0028] 1. By creating a relatively enclosed space through a light-shielding chamber, external light sources are isolated, and lighting is provided inside the light-shielding chamber by a lamp, making the brightness inside the light-shielding chamber constant and controllable. Visual inspections performed inside the light-shielding chamber are not affected by light from the natural environment, thus improving the accuracy of the inspection.

[0029] 2. By setting up a calibration component inside the light-shielding chamber, the optical calibration plate can be folded or unfolded through an internal electric push rod and an adjusting motor, which makes calibration work very convenient. This calibration method can be performed not only before the test begins, but also at any time during the test interval. Multiple calibrations make the test accuracy more reliable. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0031] Figure 1 This is a structural diagram of a visual inspection device;

[0032] Figure 2 A structural diagram of the printing substrate component of a visual inspection device;

[0033] Figure 3 A structural diagram of the light-shielding chamber of a visual inspection device;

[0034] Figure 4 This is a bottom view of the cover plate of the vision inspection equipment;

[0035] Figure 5 A structural diagram of the lifting component of a vision inspection device;

[0036] Figure 6 This is a diagram of the closed door structure of a vision inspection device.

[0037] Figure 7 A structural diagram of the calibration components for a vision inspection device;

[0038] Figure 8 This is a diagram of the internal structure of the load-bearing frame of a vision inspection device.

[0039] Figure 9 A bottom-view structural diagram of the rotary table of a vision inspection device;

[0040] Figure 10 This is a system diagram of a visual inspection device.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Load-bearing frame; 2. Support frame; 3. Testing table; 4. Wireless communication module; 5. Controller; 6. Light-shielding chamber; 7. Rotary table; 8. Printing assembly; 801. External electric push rod; 802. Printing table; 803. Roller; 9. Sealing door; 10. Linear motor; 11. Cover plate; 12. Center table;

[0043] 13. Lifting assembly; 1301. Mounting plate; 1302. Telescopic rod; 1303. Sliding frame; 1304. Screw; 1305. Handwheel; 14. Support plate; 15. Calibration assembly; 1501. Optical calibration plate; 1502. Internal electric push rod; 1503. Adjustment motor; 1504. Fixed shaft; 16. Connecting arm; 17. Drive motor; 18. Light sensor; 19. Semicircular groove; 20. Ball bearing; 21. Illumination lamp; 22. Detection camera. Detailed Implementation

[0044] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0045] This invention provides a visual inspection method for the secondary printing accuracy of crystalline silicon solar photovoltaic cells, the specific steps of which are as follows:

[0046] S1: Connect the visual inspection device to a computer wirelessly so that the visual inspection device can be remotely controlled by the computer;

[0047] S2: Preparations before testing;

[0048] S2.1: Adjust the brightness inside the light-shielding chamber 6 of the visual inspection equipment to make the brightness suitable for visual inspection, and maintain this brightness in the subsequent inspection process so that the ambient brightness remains constant throughout the entire maintenance process;

[0049] S2.2: Calibrate and adjust the visual inspection equipment under the brightness conditions adjusted in S2.1, including adjusting the distance of the captured image, setting the shooting parameters, etc.

[0050] S3: The visual inspection equipment drives the crystalline silicon solar photovoltaic cell after secondary printing to rotate. When it moves to the inspection station, it is inspected. Before moving to the inspection station, it first passes through the printing station to print the crystalline silicon solar photovoltaic cell a second time and dry it.

[0051] S4: The inspection is carried out inside the light-shielding chamber 6 of the vision inspection equipment, which isolates the light source in the external environment. The crystalline silicon solar photovoltaic cell is photographed under the brightness environment adjusted in S2.

[0052] S5: The captured image data is remotely transmitted to a computer. The computer can receive the detection data and use its built-in program to analyze the image data, calculate the difference between the second printing and the first printing, and obtain the detection result.

[0053] like Figure 1-10As shown, the visual inspection device includes a light-shielding chamber 6, with a detachable cover plate 11 at the top of the light-shielding chamber 6. A lifting assembly 13 is provided on the cover plate 11, and a plurality of inspection cameras 22 for capturing images are provided at the bottom of the lifting assembly 13. The inspection cameras 22 capture images of crystalline silicon solar photovoltaic cells so as to analyze the images and perform visual inspection.

[0054] The top of the cover plate 11 is fixedly provided with a wireless communication module 4 and a controller 5. The controller 5 is remotely connected to a computer through the wireless communication module 4. The detection camera 22 is located at the input end of the controller 5. The bottom of the cover plate 11 is fixedly provided with a plurality of lighting lamps 21 located inside the light-shielding chamber 6. The lighting lamps 21 provide illumination for the interior of the light-shielding chamber 6. The lighting lamps 21 are located at the output end of the controller 5.

[0055] The visual inspection is carried out inside the shading chamber 6. The crystalline silicon solar photovoltaic cells to be inspected are moved into the shading chamber 6 (hereinafter referred to as cells). The shading chamber 6 isolates the natural light source from the external environment and uses lighting lamp 21 for illumination, so that the ambient brightness can be kept constant during the inspection process. Subsequently, multiple inspection cameras 22 simultaneously take pictures of the cells after secondary printing in a constant brightness environment, and remotely transmit the captured image data to a computer for analysis and inspection. This inspection method allows the brightness of the inspection environment to be freely controlled and kept constant, without being affected by light in the natural environment, thus improving the accuracy of the inspection.

[0056] The detection accuracy of the detection camera 22 can be calibrated before or during detection, such as... Figure 3 , 7 As shown in Figure 10, the light-shielding chamber 6 is provided with a calibration component 15. The calibration component 15 includes an adjustment motor 1503 fixedly mounted on the inner wall of the light-shielding chamber 6. One end of the output shaft of the adjustment motor 1503 is fixedly mounted with a fixed shaft 1504. One end of the fixed shaft 1504 is rotatably connected to the inner wall of the light-shielding chamber 6.

[0057] The calibration assembly 15 also includes an optical calibration plate 1501. Two internal electric push rods 1502 are provided between the optical calibration plate 1501 and the fixed shaft 1504. The two ends of the internal electric push rods 1502 are fixedly connected to the optical calibration plate 1501 and the fixed shaft 1504, respectively. A light sensor 18 for sensing ambient brightness is fixedly provided at the outer end of the optical calibration plate 1501. The light sensor 18 is located at the input end of the controller 5, and the adjustment motor 1503 is located at the output end of the controller 5.

[0058] When not in use, the calibration component 15 is folded and retracted into the inner rear wall of the testing station 3, with the inner electric push rod 1502 in a vertical position. Before testing begins or during testing intervals, the adjusting motor 1503 can be controlled to drive the fixed shaft 1504 to rotate, thereby rotating the inner electric push rod 1502 and the optical calibration plate 1501. This causes the optical calibration plate 1501 to rotate to a horizontal position, and the inner electric push rod 1502 pushes the optical calibration plate 1501 to move horizontally, positioning the horizontal optical calibration plate 1501 directly below the testing camera 22. The testing camera 22 then takes pictures of it, thus achieving the calibration function and ensuring that the testing camera 22 can always perform accurate testing. At the same time, the light sensor 18 fixed on the optical calibration plate 1501 can also detect the brightness inside the light-shielding chamber 6, ensuring that the detected brightness remains constant. This calibration method can be performed not only before testing begins but also at any time during testing intervals, making it more convenient and ensuring more reliable testing accuracy.

[0059] The shooting distance can be adjusted before the test begins, such as... Figure 4 , 5 As shown, the lifting assembly 13 includes a mounting plate 1301 located inside the light-shielding chamber 6. The detection cameras 22 are all located at the bottom of the mounting plate 1301. A plurality of telescopic rods 1302 are provided between the mounting plate 1301 and the cover plate 11. The two ends of the telescopic rods 1302 are fixedly connected to the cover plate 11 and the mounting plate 1301 respectively.

[0060] A screw 1304 is fixedly provided on the cover plate 11, passing through the cover plate 11 and movably connected to the cover plate 11 via a bearing. A handwheel 1305 is fixedly provided at the top end of the screw 1304, and a sliding frame 1303 is threadedly sleeved on the outer end of the screw 1304. The sliding frame 1303 is fixedly provided on the top end of the mounting plate 1301.

[0061] The inspection camera 22 is mounted and fixed at the bottom of the mounting plate 1301. Turning the handwheel 1305 will drive the screw 1304 to rotate. The screw 1304 is connected to the sliding frame 1303 by a thread. Therefore, after it rotates, the sliding frame 1303 will slide longitudinally on the screw 1304 and control the mounting plate 1301 and the inspection camera 22 to move up and down. This controls the height of the inspection camera 22 and adjusts the distance between the inspection camera 22 and the battery cell, thereby adjusting the shooting distance.

[0062] The solar cells to be tested are moved one by one to six locations in the light-shielding chamber for testing, such as... Figure 1 , 8As shown in Figures 9 and 10, a testing platform 3 is fixedly provided at the bottom of the light-shielding chamber 6, a support frame 2 is fixedly provided at the bottom of the testing platform 3, a load-bearing frame 1 is fixedly provided at the front end of the testing platform 3, a rotating platform 7 is provided at the top of the load-bearing frame 1, a tray 14 is fixedly provided on the inner wall of the light-shielding chamber 6, the front end of the tray 14 extends to the front side of the light-shielding chamber 6, a calibration component 15 is provided above the tray 14, and the top end of the tray 14 is flush with the top end of the rotating platform 7.

[0063] The inner wall of the load-bearing frame 1 is fixed with a drive motor 17 for driving the rotary table 7 to rotate. The drive motor 17 is located at the output end of the controller 5. The bottom end of the rotary table 7 is fixed with a plurality of ball bearings 20 that contact the top end of the load-bearing frame 1.

[0064] The rotating table 7 is driven by the drive motor 17 to rotate at the top of the support frame 1. During the rotation, the ball bearing 20 rolls at the top of the support frame 1. The rotation of the rotating table 7 drives the battery cells to move one by one to the light-shielding chamber 6 for testing.

[0065] The battery cells located outside the light-shielding chamber 6 are automatically fed into the light-shielding chamber 6 for testing, such as... Figure 1 , 2 As shown in Figures 3 and 10, a central platform 12 is fixedly provided at the center of the top of the rotary table 7. A plurality of printing components 8 are provided at the outer end of the central platform 12. The printing components 8 include an external electric push rod 801 fixedly provided at the outer end of the central platform 12. The external electric push rod 801 is provided at the output end of the controller 5.

[0066] One end of the external electric push rod 801 is fixedly provided with a printing platform 802. Two rollers 803 are rotatably connected to both sides of the printing platform 802. The rollers 803 can bear the weight of the printing platform 802. The rollers 803 are in contact with the top of the rotating table 7.

[0067] The battery cell is located at the top of the printing table 802. The rotating table 7 drives the printing assembly 8 to rotate. First, it rotates to the printing station for printing and drying. Then, the rotating table 7 drives the printing assembly 8 to rotate to the front of the light-shielding chamber 6. At this time, the external electric push rod 801 extends, pushing the printing table 802 to move. At the same time, the roller 803 rolls. The printing table 802 moves and drives the battery cell at its top to the top of the tray 14 inside the light-shielding chamber 6. The battery cell inside the light-shielding chamber 6 is visually inspected. After the inspection is completed, the external electric push rod 801 pulls the printing table 802 and the battery cell back to their original position. The rotating table 7 continues to rotate, rotating the next printing assembly 8 and battery cell to the light-shielding chamber 6 for inspection. This cycle repeats.

[0068] In order to seal off the light-blocking room 6, such as Figure 1 , 3As shown in Figures 6 and 10, two closed doors 9 are symmetrically arranged at the opening on the front side of the light-shielding chamber 6. Two semi-circular grooves 19 are opened at the outer end of the closed doors 9. When the two closed doors 9 are closed, the two semi-circular grooves 19 can be merged into a circular hole, which can be fitted onto the outer end of the outer electric push rod 801.

[0069] A linear motor 10 is fixedly installed at the top of the cover plate 11. The linear motor 10 is located at the output end of the controller 5. The linear motor 10 has two moving parts, and each moving part is provided with a connecting arm 16. One end of each connecting arm 16 is fixedly connected to two closed doors 9, thereby controlling the opening and closing of the closed doors 9.

[0070] The opening of the light-shielding chamber 6 is closed by setting two sealing doors 9 at the front opening. When the battery needs to enter or exit the light-shielding chamber 6, the two movers of the linear motor 10 move away from each other, thereby driving the two sealing doors 9 away from each other through the connecting arm 16, opening the front opening of the light-shielding chamber 6. During testing, the two movers drive the two sealing doors 9 to approach each other until they contact each other, thereby closing the opening of the light-shielding chamber 6 and achieving the purpose of light shielding. During testing, the external electric push rod 801 extends from the outside of the light-shielding chamber 6 to the inside of the light-shielding chamber 6. When the sealing doors 9 are closed, the external electric push rod 801 is stuck in the semi-circular groove 19 of the two sealing doors 9, so that the external electric push rod 801 does not affect the closing of the two sealing doors 9.

[0071] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A visual inspection method for the secondary printing accuracy of crystalline silicon solar photovoltaic cells, characterized in that: The specific steps are as follows: S1: Connect the visual inspection equipment to the computer wirelessly and remotely; S2: Preparations before testing; S2.1: Adjust the brightness inside the light-shielding chamber (6) of the visual inspection equipment and maintain this brightness during subsequent inspections; S2.2: Calibrate and adjust the visual inspection equipment under the brightness conditions adjusted in S2.1; S3: The visual inspection equipment drives the crystalline silicon solar photovoltaic cell after secondary printing to rotate, and performs inspection when it moves to the inspection station. S4: The inspection is carried out inside the light-shielding chamber (6) of the visual inspection equipment, which isolates the light source in the external environment. The crystalline silicon solar photovoltaic cell is photographed under the brightness environment adjusted in S2. S5: The captured image data is remotely transmitted to a computer to obtain the detection results.

2. The visual inspection method for secondary printing accuracy of crystalline silicon solar photovoltaic cells according to claim 1, characterized in that: The visual inspection device includes a light-shielding chamber (6), the top of which is provided with a detachable cover plate (11), the cover plate (11) is provided with a lifting assembly (13), and the bottom of the lifting assembly (13) is provided with a plurality of inspection cameras (22) for capturing images. The top of the cover plate (11) is fixedly provided with a wireless communication module (4) and a controller (5), the detection camera (22) is located at the input end of the controller (5), and the bottom of the cover plate (11) is fixedly provided with a plurality of lighting lamps (21) located inside the light-shielding chamber (6), and the lighting lamps (21) are located at the output end of the controller (5).

3. The visual inspection method for secondary printing accuracy of crystalline silicon solar photovoltaic cells according to claim 2, characterized in that: The light-shielding chamber (6) is equipped with a calibration component (15). The calibration component (15) includes an adjustment motor (1503) fixedly installed on the inner wall of the light-shielding chamber (6). One end of the output shaft of the adjustment motor (1503) is fixedly provided with a fixed shaft (1504). One end of the fixed shaft (1504) is rotatably connected to the inner wall of the light-shielding chamber (6). The calibration component (15) also includes an optical calibration plate (1501). Two internal electric push rods (1502) are provided between the optical calibration plate (1501) and the fixed shaft (1504). A light sensor (18) for sensing ambient brightness is fixedly provided at the outer end of the optical calibration plate (1501). The light sensor (18) is located at the input end of the controller (5). The adjustment motor (1503) is located at the output end of the controller (5).

4. The visual inspection method for secondary printing accuracy of crystalline silicon solar photovoltaic cells according to claim 2, characterized in that: The lifting assembly (13) includes a mounting plate (1301) located inside the light-shielding chamber (6), and the detection cameras (22) are all located at the bottom of the mounting plate (1301). Multiple telescopic rods (1302) are provided between the mounting plate (1301) and the cover plate (11). A screw (1304) is fixedly provided on the cover plate (11) and is movably connected to the cover plate (11) through a bearing. A handwheel (1305) is fixedly provided at the top end of the screw (1304). A sliding frame (1303) is threadedly sleeved on the outer end of the screw (1304). The sliding frame (1303) is fixedly provided on the top end of the mounting plate (1301).

5. The visual inspection method for secondary printing accuracy of crystalline silicon solar photovoltaic cells according to claim 2, characterized in that: The bottom of the light-shielding chamber (6) is fixedly provided with a testing platform (3), the bottom of the testing platform (3) is fixedly provided with a support frame (2), the front end of the testing platform (3) is fixedly provided with a load-bearing frame (1), the top of the load-bearing frame (1) is provided with a rotating platform (7), and a tray (14) is fixedly provided on the inner wall of the light-shielding chamber (6), the top of the tray (14) is flush with the top of the rotating platform (7).

6. The visual inspection method for secondary printing accuracy of crystalline silicon solar photovoltaic cells according to claim 5, characterized in that: The inner wall of the load-bearing frame (1) is fixed with a drive motor (17) for driving the rotary table (7) to rotate. The drive motor (17) is located at the output end of the controller (5). The bottom end of the rotary table (7) is fixed with a plurality of ball bearings (20) that contact the top end of the load-bearing frame (1).

7. The visual inspection method for secondary printing accuracy of crystalline silicon solar photovoltaic cells according to claim 6, characterized in that: A central platform (12) is fixedly provided at the center of the top of the rotary table (7). A plurality of printing components (8) are provided at the outer end of the central platform (12). The printing components (8) include an external electric push rod (801) fixedly provided at the outer end of the central platform (12). The external electric push rod (801) is provided at the output end of the controller (5). One end of the external electric push rod (801) is fixedly provided with a printing platform (802), and two rollers (803) are rotatably connected on both sides of the printing platform (802), and the rollers (803) are in contact with the top of the rotating table (7).

8. A visual inspection method for the secondary printing accuracy of crystalline silicon solar photovoltaic cells according to claim 6, characterized in that: Two closed doors (9) are symmetrically arranged at the opening on the front side of the light-shielding chamber (6). Two semi-circular grooves (19) are opened at the outer end of the closed doors (9). When the two closed doors (9) are closed, the two semi-circular grooves (19) can be merged into a circular hole. A linear motor (10) is fixedly installed at the top of the cover plate (11). The linear motor (10) is located at the output end of the controller (5). The linear motor (10) has two movers, and each mover is provided with a connecting arm (16). One end of each connecting arm (16) is fixedly connected to one of the two closed doors (9).

Images