Scraper pressure self-adaptive adjusting system for photovoltaic cell printing and printing method

Abstract

The invention discloses a scraper pressure self-adaptive adjusting system for photovoltaic cell printing and a printing method, and belongs to the technical field of photovoltaic cell production. The scraper pressure self-adaptive adjusting system for photovoltaic cell printing is integrated on a silk-screen printing mechanism; the silk-screen printing mechanism comprises a base and a walking mechanism. A printing groove is formed in the base, a printing screen plate is fixedly installed in the printing groove, and a slurry preparing opening is formed in the printing groove; a supporting beam is installed on the walking mechanism, an installation frame is fixedly installed on the supporting beam, and a slurry scraping plate is rotatably installed on the installation frame. According to the invention, parameter information such as the slurry viscosity, the screen state and the printing process can be collected in real time, and the angle of the slurry scraping plate is dynamically adjusted according to the parameter information, so that self-adaptive adjustment of the pressure of the slurry scraping plate is realized, the printing effect is improved, and the overall performance of a photovoltaic cell is ensured.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic cell production technology, specifically relating to an adaptive adjustment system for squeegee pressure and a printing method for photovoltaic cell printing. Background Technology

[0002] In the production of photovoltaic cells, screen printing is a key technology used to precisely coat conductive paste onto the cells to form crucial circuit structures. Ensuring uniform and efficient paste coating is essential for improving cell efficiency and reducing costs. A squeegee, a common printing tool, applies pressure to evenly print paste onto the electrode surface. However, the stability and accuracy of squeegee pressure directly affect the quality of the printed pattern (such as grid line width, aspect ratio, and broken lines) and the cell's conversion efficiency.

[0003] Currently, the pressure of the squeegee is usually adjusted manually. This method cannot ensure the accuracy and consistency of the squeegee pressure, thus affecting the printing effect and consequently the overall performance of the photovoltaic cells. Furthermore, the instability of manual operation increases the variability between products, leading to low yield and low production efficiency. Adjusting process parameters not only relies on the operator's experience but also requires multiple trials by different operators to achieve satisfactory results.

[0004] Therefore, in order to address the above-mentioned technical problems, it is necessary to provide a squeegee pressure adaptive adjustment system and printing method for printing photovoltaic cells.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide an adaptive adjustment system and method for squeegee pressure in photovoltaic cell printing, which can solve the problem that manual adjustment of squeegee pressure cannot ensure the accuracy and consistency of squeegee pressure, thereby affecting the printing effect and the overall performance of photovoltaic cells.

[0007] To achieve the above objectives, a specific embodiment of the present invention provides the following technical solution:

[0008] A squeegee pressure adaptive adjustment system for printing photovoltaic cells is integrated into a screen printing mechanism, which includes a base and a traveling mechanism.

[0009] The base is provided with a printing groove, a printing screen is fixedly installed inside the printing groove, and a paste dispensing port is provided inside the printing groove;

[0010] A support beam is installed on the walking mechanism, a mounting frame is fixedly installed on the support beam, and a scraper is rotatably installed on the mounting frame;

[0011] The scraper pressure adaptive adjustment system includes an image acquisition module, an analysis and processing module, an adjustment actuator, and a self-cleaning structure;

[0012] The image acquisition module includes a visual monitoring camera, which is installed on one side of the squeegee and is used to acquire images of slurry flow, printing screen status, and printing process.

[0013] The analysis and processing module obtains information on slurry viscosity, screen status, and printing process parameters by recognizing slurry flow images, printing screen status images, and printing process images, and determines the pressure adjustment amount of the squeegee based on the parameter information.

[0014] The adjustment actuator is mounted on the mounting frame and is used to drive the scraper blade to rotate. By adjusting the angle of the scraper blade, the scraper blade pressure is automatically adjusted.

[0015] The self-cleaning structure is located on the side of the scraper that contacts the slurry. The self-cleaning structure can remove the slurry adhering to the surface of the scraper by rotating the scraper.

[0016] In one or more embodiments of the present invention, a fixing clip is installed on the mounting frame, the scraper is detachably fixedly installed on the fixing clip, a first rotating shaft is fixedly installed on the top of the fixing clip, and the fixing clip is rotatably installed below the mounting frame via the first rotating shaft.

[0017] In one or more embodiments of the present invention, the adjustment actuator includes a pair of drive boxes, the pair of drive boxes being fixedly mounted on both sides of the mounting frame;

[0018] The drive box contains a worm gear and a worm wheel that are rotatably mounted, and the worm gear and worm wheel are matched.

[0019] A servo motor is fixedly installed on one side of the drive box, and the output shaft of the servo motor is fixed to one end of the worm gear.

[0020] One end of the first rotating shaft extends into the drive box and is fixed to the worm gear.

[0021] In one or more embodiments of the present invention, the lead angle of the worm is not greater than the equivalent friction angle of the meshing surface between the worm and the worm wheel.

[0022] In one or more embodiments of the present invention, the self-cleaning structure includes:

[0023] A pair of side support plates, the pair of side support plates being fixedly installed on one side of the mounting frame;

[0024] An external scraper is provided, with a second rotating shaft fixedly installed on its top. The external scraper is rotatably mounted on a pair of side support plates via the second rotating shaft.

[0025] A pair of tension springs are fixedly installed between one side of the external scraper and one side of the mounting frame, and the bottom end of the external scraper is in close contact with one side of the scraper blade.

[0026] In one or more embodiments of the present invention, the visual monitoring camera is fixedly mounted on one side of the external scraper.

[0027] In one or more embodiments of the present invention, the walking mechanism includes a moving track and an electric slide block, the moving track is fixedly installed on the base, the electric slide block is slidably installed on the moving track, and the support beam is fixedly installed on the electric slide block.

[0028] In one or more embodiments of the present invention, a gap is maintained between the slurry dispensing port and the printing screen, and when the scraper pushes the slurry through the gap, a visual monitoring camera captures an image of the slurry flow.

[0029] In one or more embodiments of the present invention, a pressure sensor is also fixedly installed on the printing screen to obtain the pressure information of the squeegee in real time.

[0030] A method for adaptive adjustment of squeegee pressure for printing photovoltaic cells, employing the aforementioned adaptive squeegee pressure adjustment system, includes the following steps:

[0031] S1. Image Acquisition: Acquire images of slurry flow, printing screen status, and printing process using a visual monitoring camera;

[0032] S2. Analysis and Processing: Analyze and process image features to obtain information on paste viscosity, screen status, and printing process parameters, and determine the pressure adjustment amount of the squeegee based on the parameter information;

[0033] S3, Pressure Execution: The regulating actuator drives the squeegee to rotate according to the pressure adjustment amount, and the contact pressure between the squeegee and the printing screen is adjusted by adjusting the rotation angle of the squeegee.

[0034] S4. Screen Cleaning: After each printing, the side of the squeegee in contact with the ink rotates upward, so that the self-cleaning structure can scrape and clean the side in contact with the ink, removing the ink adhering to the surface of the squeegee.

[0035] Compared with existing technologies, this invention can dynamically adjust the angle of the squeegee by collecting parameters such as slurry viscosity, screen status and printing process in real time, thereby achieving adaptive adjustment of squeegee pressure, improving printing effect and ensuring the overall performance of photovoltaic cells.

[0036] This invention enables automatic cleaning of the squeegee surface without stopping the printing process by using an external squeegee, thereby removing the slurry adhering to the surface and preventing the slurry adhering to the squeegee surface from affecting the stability and accuracy of the squeegee pressure, further improving printing quality and increasing the yield rate. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a structural diagram of a screen printing mechanism in one embodiment of the present invention;

[0039] Figure 2 As shown in one embodiment of the present invention Figure 1 Enlarged view of point A in the middle;

[0040] Figure 3 This is a partially enlarged view of the screen printing mechanism in one embodiment of the present invention;

[0041] Figure 4 This is a structural diagram of the scraper plate in one embodiment of the present invention;

[0042] Figure 5 This is a partial cross-sectional schematic diagram of a screen printing mechanism in one embodiment of the present invention;

[0043] Figure 6 As shown in one embodiment of the present invention Figure 3 Enlarged view at point B in the middle;

[0044] Figure 7 This is a cross-sectional view of the drive box in one embodiment of the present invention;

[0045] Figure 8 This is a flowchart of a method for adaptive adjustment of squeegee pressure for printing photovoltaic cells according to an embodiment of the present invention;

[0046] Figure 9 This is a cross-sectional view of a printing screen in one embodiment of the present invention.

[0047] Explanation of key figure labels:

[0048] 10. Base; 11. Printing tank; 12. Pulp dispensing port; 20. Moving track; 30. Electric slide; 40. Printing screen; 4. Screen cloth; 401. Protective film; 50. Support beam; 51. Mounting frame; 52. Side support plate; 60. Scraper; 61. Fixing clamp; 62. First rotating shaft; 70. External scraper; 71. Second rotating shaft; 72. Tension spring; 80. Visual monitoring camera; 90. Drive box; 91. Servo motor; 92. Worm gear; 93. Worm wheel. Detailed Implementation

[0049] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0050] like Figures 1-7 As shown in one embodiment of the present invention, a squeegee pressure adaptive adjustment system for printing photovoltaic cells is integrated into a screen printing mechanism. The screen printing mechanism includes a base 10 and a traveling mechanism. A printing groove 11 is provided on the base 10, and printing inside the printing groove 11 can effectively prevent ink overflow.

[0051] like Figure 1 and Figure 2 As shown, a printing screen 40 is fixedly installed on the lower end face inside the printing tank 11. A pressure sensor (not shown) is fixedly installed on the printing screen 40 to acquire the pressure information of the squeegee 60 in real time. A dispensing port 12 is also provided on the lower end face inside the printing tank 11, through which printing paste can be uniformly supplied into the printing tank 11. The width of the dispensing port 12 is not less than the width of the printing screen 40, ensuring that the paste can completely cover the printing screen 40. Furthermore, the dispensing port 12 is located on one side of the printing screen 40, and a gap is maintained between the dispensing port 12 and the printing screen 40. When the squeegee 60 pushes the paste through this gap, a visual monitoring camera 80 captures an image of the paste flow to obtain the paste viscosity parameter information before printing.

[0052] In some embodiments, such as Figure 9 As shown, the printing screen 40 can be a screen printing screen, including a mesh fabric 4. Protective films 401 are provided on both the upper and lower surfaces of the mesh fabric 4 to improve its wear resistance and prevent ink leakage. Preferably, the material of the protective film 401 can be polyimide (PI) or the like, and the thickness of the protective film 401 ranges from 5 to 25 μm, preferably from 10 to 15 μm.

[0053] The traveling mechanism includes a moving track 20 and an electric slide 30. The moving track 20 is fixedly installed on the top of the base 10, and the electric slide 30 is slidably installed on the moving track 20. The electric slide 30 can slide freely on the moving track 20 to drive the scraper 60 to push the ink for printing. A support beam 50 is fixedly installed on the electric slide 30, and a mounting frame 51 is fixedly installed at the bottom of the support beam 50. The mounting frame 51 is located directly above the printing tank 11.

[0054] like Figure 3 and Figure 4 As shown, a scraper blade 60 is rotatably mounted on the mounting bracket 51. The scraper blade 60 is fixed to the bottom of the fixing clamp 61 by bolts and nuts, allowing for flexible disassembly and convenient periodic replacement. A first rotating shaft 62 is fixedly mounted on the top of the fixing clamp 61, with both ends rotatably connected to both ends of the mounting bracket 51. That is, the fixing clamp 61 is rotatably mounted below the mounting bracket 51 via the first rotating shaft 62, thereby indirectly rotatably mounting the scraper blade 60 below the mounting bracket 51.

[0055] The scraper pressure adaptive adjustment system includes an image acquisition module, an analysis and processing module, an adjustment actuator, and a self-cleaning structure.

[0056] The adjusting actuator, mounted on the mounting bracket 51, drives the scraper blade 60 to rotate, automatically adjusting the pressure of the scraper blade 60 by adjusting its angle. Specifically:

[0057] like Figures 3-7 As shown, the adjustment actuator includes a pair of drive boxes 90, which are fixedly mounted on both sides of the mounting bracket 51. A worm gear 92 and a worm wheel 93 are rotatably mounted inside each drive box 90, forming a meshing connection. A servo motor 91 is fixedly mounted on one side of each drive box 90. The output shaft of the servo motor 91 is fixed to one end of the worm gear 92, and one end of a first rotating shaft 62 passes through the drive box 90 and is fixed to the worm wheel 93. The servo motor 91 can drive the worm gear 93 to rotate indirectly by driving the worm gear 92, thereby driving the first rotating shaft 62 to rotate, achieving stepless rotation adjustment of the scraper blade 60. By controlling the rotation angle of the scraper blade 60, the height of the lowest point of the scraper blade 60 can be controlled, thereby achieving automatic and precise adjustment of the scraper blade 60 pressure.

[0058] Specifically, the lead angle of the worm 92 is not greater than the equivalent friction angle of the meshing surface between the worm 92 and the worm wheel 93. This is the self-locking condition between the worm 92 and the worm wheel 93. When this self-locking condition is met, the worm 92 drives the worm wheel 93 to rotate, thus achieving automatic locking. This prevents the scraper 60 from deflecting or shaking during operation, which could lead to unstable pressure and improve pressure accuracy.

[0059] The image acquisition module includes a visual monitoring camera 80, which is mounted on one side of the squeegee 60. The camera is used to acquire images of the slurry flow, the state of the printing screen 40, and the printing process, and then uploads these images to the analysis and processing module. The analysis and processing module identifies the slurry flow images, the state of the printing screen 40, and the printing process images to obtain information on the slurry viscosity, screen state, and printing process parameters. Based on this parameter information, it determines the pressure adjustment amount of the squeegee 60.

[0060] Among them, the viscosity of the slurry is obtained by analyzing the slurry flow image; the screen status parameter refers to whether there is slight clogging on the screen, which is obtained by analyzing the printing screen 40 image; the printing process parameter refers to the amount of slurry fed during the slurry pushing process, which is obtained by analyzing the printing process image.

[0061] The adjustment amount of the squeegee 60 pressure is determined by analyzing the above parameter information. More specifically, for example, the viscosity of the printing paste should be proportional to the squeegee 60 pressure; slight clogging of the screen can be resolved by increasing the squeegee 60 pressure; and the amount of paste dispensed is also proportional to the squeegee 60 pressure. By comprehensively analyzing the above parameter information, the optimal squeegee 60 pressure adjustment amount can be determined. This allows for adaptive adjustment of the squeegee 60 pressure based on multimodal parameter information during the printing process, addressing multiple interfering factors simultaneously, rather than focusing on a single pressure variable, thus exhibiting strong robustness. Furthermore, it allows for targeted solutions, resulting in more precise and effective pressure control, significantly improving printing effects and quality, and substantially reducing the scrap rate.

[0062] The self-cleaning structure is located on the side of the scraper 60 that contacts the slurry. The self-cleaning structure can remove the slurry adhering to the surface of the scraper 60 by rotating the scraper 60.

[0063] like Figure 3 and Figure 5 As shown, specifically, the self-cleaning structure includes a pair of side support plates 52 and an external scraper 70. The pair of side support plates 52 are fixedly installed on one side of the mounting frame 51; a second rotating shaft 71 is fixedly installed on the top of the external scraper 70, with both ends of the second rotating shaft 71 rotatably connected to the pair of mounting frames 51 respectively. The external scraper 70 is rotatably installed on the pair of side support plates 52 via the second rotating shaft 71. A pair of tension springs 72 are fixedly installed between one side of the external scraper 70 and one side of the mounting frame 51. Under the action of the return tension of the tension springs 72, the bottom end of the external scraper 70 always abuts against the side of the scraper 60 that contacts the slurry.

[0064] like Figure 5As shown, during the printing process where the squeegee 60 pushes the ink, some ink adheres to the squeegee 60, resulting in ink accumulation of varying thicknesses on its surface. Since the thickness of the adhered ink increases with working time, this variable directly affects the pressure of the squeegee 60. In this invention, by using an external squeegee 70 and the stepless rotation adjustment of the squeegee 60, after each printing cycle, the squeegee 60 can be driven to rotate towards the side closer to the external squeegee 70. The external squeegee 70 automatically scrapes off the ink adhering to the side of the squeegee 60 that is in contact with the ink, achieving real-time cleaning of the squeegee 60. This prevents the continuous accumulation of ink on the surface of the squeegee 60, thus eliminating the influence of ink adhesion on the pressure of the squeegee 60, further improving the accuracy of the squeegee 60 pressure, and consequently improving printing quality.

[0065] It is worth noting that since the external scraper 70 is always in close contact with the scraper 60, the scraper 60 is structurally stable and not prone to shaking or loosening, thus ensuring a stable printing process and guaranteeing printing quality.

[0066] It is also important to note that the visual monitoring camera 80 is fixedly installed on one side of the external scraper 70. It can rotate with the external scraper 70 and adaptively track the lowest position of the scraper 60 to ensure that the visual monitoring camera 80 can acquire images of the slurry flow and the printing process.

[0067] Specifically, since the external scraper 70 is resisted by the reset force of the tension spring 72 and is in contact with the scraper 60, the external scraper 70 will also rotate during the rotation adjustment of the scraper 60. At this time, the image acquisition angle of the visual monitoring camera 80 can adaptively change with the rotation angle of the scraper 60. In this way, no matter what angle the scraper 60 is at, the visual monitoring camera 80 can acquire the image of the slurry flow and the printing process, ensuring the stable acquisition of parameter information.

[0068] like Figure 8 As shown, the adaptive adjustment method for squeegee pressure in photovoltaic cell printing, employing the aforementioned adaptive squeegee pressure adjustment system, includes the following steps:

[0069] S1. Image Acquisition: Images of slurry flow, printing screen 40 status, and printing process are acquired through the visual monitoring camera 80.

[0070] S2. Analysis and Processing: Analyze and process image features to obtain information on paste viscosity, screen status, and printing process parameters, and determine the pressure adjustment amount of the squeegee 60 based on the parameter information;

[0071] S3, Pressure Execution: The regulating actuator drives the squeegee 60 to rotate according to the pressure adjustment amount, and adjusts the contact pressure between the squeegee 60 and the printing screen 40 by adjusting the rotation angle of the squeegee 60.

[0072] S4. Screen cleaning: After each printing is completed, the side of the squeegee 60 that is in contact with the ink rotates upward, so that the self-cleaning structure scrapes and cleans the side that is in contact with the ink, removing the ink adhering to the surface of the squeegee 60.

[0073] In use, the paste enters the printing tank 11 through the paste dispensing port 12. At this time, the traveling mechanism drives the scraper 60 to move, pushing the paste to flow for printing. During the printing process, the visual monitoring camera 80 collects images of the paste flow, the state of the printing screen 40, and the printing process, and analyzes the image features to obtain information on the paste viscosity, screen state, and printing process parameters. Based on the parameter information, the pressure adjustment of the scraper 60 is determined. Then, the servo motors 91 on both sides are started simultaneously. The servo motors 91 drive the worm gear 92 to rotate, which in turn drives the worm wheel 93 to rotate, thereby driving the first rotating shaft 62 to rotate, which in turn causes the scraper 60 to rotate at a corresponding angle. During the rotation of the scraper 60, the bottom height of the scraper 60 changes, causing the pressure of the scraper 60 to change. This achieves adaptive adjustment of the scraper 60 pressure based on multiple parameter information. In addition, after each printing is completed, the squeegee 60 can be driven to rotate towards the side closer to the external squeegee 70, so that the external squeegee 70 can automatically scrape off the paste adhering to the squeegee 60, thereby achieving real-time cleaning of the squeegee 60 and eliminating the influence of paste adhesion on the pressure of the squeegee 60.

[0074] This invention can dynamically adjust the angle of the squeegee 60 by collecting parameters such as slurry viscosity, screen status, and printing process in real time, so as to achieve adaptive adjustment of the squeegee 60 pressure, improve the printing effect, and ensure the overall performance of photovoltaic cells.

[0075] The present invention enables the external scraper 70 to automatically clean the surface of the scraper 60 without stopping the machine, thereby removing the paste adhering to its surface and preventing the paste adhering to the scraper 60 surface from affecting the stability and accuracy of the scraper 60 pressure, thus further improving printing quality and increasing the yield rate.

[0076] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0077] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A system for self-adapting the pressure of a squeegee for photovoltaic cell printing, characterized in that, The squeegee pressure self-adaptive adjusting system is integrated on the screen printing mechanism, and the screen printing mechanism comprises: A base is provided with a printing groove, and a printing screen is fixedly installed in the printing groove. A walking mechanism is provided with a supporting beam, and a mounting frame is fixedly installed on the supporting beam. The squeegee pressure self-adaptive adjusting system comprises: An image acquisition module comprises a visual monitoring camera, which is installed on one side of the squeegee plate and used for acquiring a paste flow image, a printing screen state image and a printing process image. An analysis processing module acquires paste viscosity, screen state and printing process parameter information by identifying the paste flow image, the printing screen state image and the printing process image, and determines a pressure adjusting amount of the squeegee plate according to the parameter information. An adjusting execution mechanism is installed on the mounting frame and used for driving the squeegee plate to rotate, so as to automatically adjust the pressure of the squeegee plate by adjusting the angle of the squeegee plate. A self-cleaning structure is located on one side of the squeegee plate in contact with the paste, and the self-cleaning structure can realize scraping of the paste attached to the surface of the squeegee plate by rotating the squeegee plate.

2. The squeegee pressure self-adapting adjustment system for photovoltaic cell printing according to claim 1, characterized in that, A fixing clamp is installed on the mounting frame, and the squeegee plate is detachably fixedly installed on the fixing clamp.

3. The doctor blade pressure self-adaptive adjusting system for photovoltaic cell printing according to claim 2, characterized in that, The adjusting execution mechanism comprises a pair of drive boxes. The drive boxes are respectively fixedly installed on the two sides of the mounting frame. A worm and a worm wheel are respectively rotatably installed in the drive boxes. A servo motor is fixedly installed on one side of the drive box.

4. The system for self-adapting the pressure of the doctor blade for photovoltaic cell printing according to claim 3, characterized in that, The output shaft of the servo motor is fixedly connected with one end of the worm.

5. The doctor pressure self-adaptive adjusting system for photovoltaic cell printing according to claim 4, characterized in that, The end of the first rotating shaft penetrates into the drive box and is fixedly connected with the worm wheel. The lead angle of the worm is not greater than the equivalent friction angle of the meshing surface of the worm and the worm wheel. The self-cleaning structure comprises: A pair of side plates are fixedly installed on one side of the mounting frame.

6. The doctor blade pressure self-adaptive adjusting system for photovoltaic cell printing according to claim 5, characterized in that, An outer scraping plate is fixedly installed on the top of the outer scraping plate.

7. The squeegee pressure self-adapting adjustment system for photovoltaic cell printing according to claim 1, wherein, A pair of extension springs are fixedly installed between one side of the outer scraping plate and one side of the mounting frame.

8. The doctor blade pressure self-adaptive adjusting system for photovoltaic cell printing according to claim 1, characterized in that, The bottom end of the outer scraping plate is tightly attached to one side of the squeegee plate.

9. The doctor blade pressure self-adaptive adjusting system for photovoltaic cell printing according to claim 1, characterized in that, The visual monitoring camera is fixedly installed on one side of the outer scraping plate.

10. A method for self-adapting the pressure of a squeegee for photovoltaic cell printing, using a self-adapting pressure squeegee system according to any one of claims 1 to 9, characterized in that, The walking mechanism comprises a moving track and an electric sliding seat. The moving track is fixedly installed on the base. The electric sliding seat is slidably installed on the moving track. The supporting beam is fixedly installed on the electric sliding seat. The paste flow image is acquired by the visual monitoring camera when the squeegee plate pushes the paste through the interval between the paste mixing port and the printing screen. The printing screen is also fixedly installed with a pressure sensor for acquiring the pressure information of the squeegee plate in real time. The method comprises the following steps: S1, image acquisition: collecting slurry flow image, printing screen state image and printing process image through visual monitoring camera; S2, analysis and processing: analyzing and processing image features, obtaining slurry viscosity, screen state and printing process parameter information, and determining the pressure adjustment amount of the doctor blade according to the parameter information; S3, pressure execution: the adjusting actuator drives the doctor blade to rotate according to the pressure adjustment amount, and adjusts the contact pressure between the doctor blade and the printing screen by adjusting the rotation angle of the doctor blade; S4, screen cleaning: after each printing is completed, the side of the doctor blade in contact with the slurry is turned upward, so that the self-cleaning structure scrapes and cleans the side of the doctor blade in contact with the slurry, and removes the slurry attached to the surface of the doctor blade.

Images