A screen printing fine grid line device for solar cell pieces

Abstract

The application relates to the technical field of screen printing, and particularly relates to a screen printing fine grid line device for solar cell pieces; the device comprises a rack, a transfer module arranged on the rack, the transfer module being provided with a transfer table capable of cyclically transferring the cell pieces, a driving module oppositely arranged on one side of the transfer module and having a driving end facing the transfer module, a squeegee module arranged on the driving end of the driving module, the squeegee module being provided with a printing plate, a first squeegee capable of squeegeeing the paste on the printing plate and a paste squeegeeing unit capable of reciprocally coating the paste on the printing plate, and a roller pressing module vertically arranged on one side of the paste squeegeeing unit and having a roller pressing end longitudinally arranged on the printing plate, the roller pressing module being provided with a pressure roller capable of continuously and pressure-roller-pressing the paste and an adjusting unit capable of adjusting the pressure of the pressure roller; the device can not only uniformly squeegee the paste in real time, but also can not cause paste leakage and thin squeegeeing.

Description

Technical Field

[0001] This invention relates to the field of screen printing technology, specifically to a device for screen printing fine grid lines for solar cells. Background Technology

[0002] With the rapid development of the photovoltaic industry, the conversion efficiency and product consistency of solar cells have become core indicators of industry concern. As one of the key processes in cell production, screen printing directly affects grid resistance, light shading rate, and cell performance. Especially for high-efficiency cells, grid linewidth control and printing uniformity are particularly critical.

[0003] In existing screen printing equipment, a single squeegee structure is commonly used for squeegee application and back-squeegee processing of the ink. However, during the back-squeegee movement after reaching the termination position, insufficient back-squeegee force or an unstable back-squeegee path can easily lead to uneven coverage, misaligned accumulation, or excessively thin ink in localized areas on the printing plate surface. This can subsequently cause defects such as ink leakage, broken lines, and weak lines in subsequent printing. Furthermore, because the coating requirements for ink in high-precision printing are high, even slight unevenness in thickness can affect the electrical properties of the grid lines and the integrity of the pattern, severely restricting the consistency and stability of grid line printing.

[0004] Meanwhile, during the continuous scraping process of the paste, due to the lack of an effective collaborative structure for paste replenishment, pressing, and scraping in existing equipment, the paste is prone to problems such as poor flow, residue accumulation, or gradual thinning of the coating thickness on the printing plate surface, which cannot meet the current high-precision printing process requirements for continuous paste supply and uniform coating. Summary of the Invention

[0005] To address the aforementioned problems, a fine grid line screen printing device for solar cells is provided. This device provides a screen printing structure that ensures continuous and uniform coverage of the printing plate surface by the ink during the printing and scraping processes, and effectively prevents thin ink coverage or ink leakage. This solves the technical problems of existing printing equipment where insufficient scraping force or unstable scraping path leads to uneven ink coverage, misaligned accumulation, or excessively thin ink in local areas on the printing plate surface, which in turn causes ink leakage, line breakage, and weak lines in subsequent printing.

[0006] To address the problems of existing technologies, this invention provides a screen printing device for fine grid lines on solar cells, comprising: a frame; a transfer module disposed on the frame, the transfer module having a transfer table capable of cyclically transferring solar cells; a drive module disposed on one side of the transfer module with its drive end facing the transfer module; a squeegee module disposed on the drive end of the drive module, the squeegee module having a printing plate and a first squeegee capable of squeegeeing the paste on the printing plate, and a squeegee unit capable of reciprocatingly coating the paste onto the printing plate; and a roller pressing module vertically disposed on one side of the squeegee unit with its roller pressing end longitudinally facing the printing plate, the roller pressing module having a pressure roller capable of continuously applying constant pressure to the paste and an adjustment unit capable of adjusting the pressure of the pressure roller.

[0007] Preferably, the scraping module further includes a first mounting bracket and a first linear driver and a second linear driver capable of longitudinally driving the first scraper and the scraping unit to slide longitudinally, respectively; the first mounting bracket is fixedly disposed on the driving end of the driving module; the first linear driver is vertically fixedly disposed on the first mounting bracket; the first scraper is horizontally fixedly disposed on the driving end of the first linear driver; the second linear driver is vertically fixedly disposed on one side of the first mounting bracket; and the scraping unit is horizontally fixedly disposed on the driving end of the second linear driver.

[0008] Preferably, the slurry scraping unit is provided with a second scraper capable of scraping back the slurry and a slurry replenishment box capable of temporarily storing and replenishing the slurry; the second scraper is fixedly installed vertically on one side of the driving end of the second linear actuator; the slurry replenishment box is fixedly installed horizontally on one side of the second scraper, and the bottom of the slurry replenishment box is also provided with a slurry outlet, which is flush with the bottom of the second scraper.

[0009] Preferably, the second scraper consists of a first collecting part, a collecting strip, and a second collecting part that are fixedly connected in sequence; the first collecting part and the second collecting part are disposed opposite to each other at both ends of the collecting strip.

[0010] Preferably, the slurry filling box consists of a slurry storage chamber and a slurry guiding chamber that are stacked on top of each other and connected to each other; the top of the slurry storage chamber and the bottom of the slurry guiding chamber are respectively provided with a slurry outlet and a slurry inlet.

[0011] Preferably, the slurry replenishment box further includes a pressure plate capable of pressurizing the slurry in the slurry storage chamber and a first guide rod capable of longitudinally guiding the movement of the pressure plate; two first guide rods are provided, and the two first guide rods are arranged perpendicularly to each other in the slurry storage chamber; the pressure plate is arranged horizontally in the slurry storage chamber and has through holes on its surface for the first guide rods to pass through and slide in cooperation with the first guide rods.

[0012] Preferably, the adjustment unit includes a second mounting bracket, a telescopic bracket, a second guide rod, a spring, and an adjusting nut; the telescopic bracket is mounted on one side of the drive end of the second linear actuator via the second mounting bracket; two opposing second guide rods are also vertically mounted on the telescopic bracket, with the rod portion of the second guide rod passing through the second mounting bracket and slidingly engaging with it; the pressure roller is rotatably mounted horizontally within the telescopic bracket; the spring is coaxially sleeved on the outside of the second guide rod, with both ends abutting against the adjacent surfaces of the telescopic bracket and the second mounting bracket respectively; the adjusting nut is screwed onto the top of the second guide rod.

[0013] Preferably, the adjustment unit further includes a third scraper capable of scraping off the slurry adhering to the outer wall of the pressure roller; the third scraper is horizontally arranged on one side of the telescopic frame along the long side direction of the telescopic frame and the scraping end is arranged in close contact with the side wall of the pressure roller.

[0014] The advantages of this invention compared to the prior art are:

[0015] 1. This invention achieves the division of labor and coordination between the printing and slurry return functions by setting different scraping heights for the first and second scrapers, so that the slurry can form a uniform and continuous grid structure on the printing plate, avoiding problems such as broken lines, skipped lines, or inconsistent line widths.

[0016] 2. This invention sets the ink outlet of the ink guide chamber to be flush with the printing plate, so that ink can be automatically replenished by gravity and pressure in case of ink shortage; and the ink storage chamber is equipped with a pressure plate, which can apply stable pressure to the ink, further improving the response speed and accuracy of automatic ink replenishment, and ensuring the continuity and stability of the printing process.

[0017] 3. By adjusting the nut and the telescopic frame, the longitudinal height of the pressure roller can be precisely adjusted, thereby controlling the roller gap, ensuring the low-pressure roller pressing effect on the backing slurry, effectively avoiding slurry-deficient areas caused by slurry accumulation or unevenness, and improving the uniformity of backing. Attached Figure Description

[0018] Figure 1 This is a three-dimensional diagram of a device for screen printing fine grid lines for solar cells.

[0019] Figure 2 A side view of a screen-printed fine grid line device for solar cells. Figure 1 .

[0020] Figure 3 This is an exploded perspective view of a fine grid line device for screen printing on solar cells.

[0021] Figure 4A side view of a screen-printed fine grid line device for solar cells. Figure 2 .

[0022] Figure 5 This is an exploded perspective view of the squeegee module and the roller pressing module in a screen printing fine grid line device for solar cells.

[0023] Figure 6 This is a three-dimensional view of the squeegee module and the roller pressing module in a screen printing fine grid line device for solar cells.

[0024] Figure 7 This is a side view of the squeegee module and the roll forming module in a screen printing fine grid line device for solar cells.

[0025] Figure 8 This is a front view of the squeegee module and the roller pressing module in a screen printing fine grid line device for solar cells.

[0026] Figure 9 yes Figure 8 Sectional view at point AA.

[0027] Figure 10 yes Figure 9 A magnified view of section B.

[0028] The numbers on the map are:

[0029] 1. Rack;

[0030] 2. Transfer module; 21. Transfer platform; 22. Turntable;

[0031] 3. Drive module; 31. Third linear driver; 32. Fourth linear driver;

[0032] 4. Squeegee module; 41. Printing plate; 42. First squeegee; 43. Squeegee unit; 431. Second squeegee; 4311. First slurry collection section; 4312. Slurry collection strip; 4313. Second slurry collection section; 432. Slurry replenishment box; 4321. Slurry storage bin; 4322. Slurry guide bin; 4323. Pressure plate; 4324. First guide rod; 44. First mounting bracket; 45. First linear actuator; 46. Second linear actuator;

[0033] 5. Roller pressing module; 51. Press roller; 52. Adjustment unit; 521. Second mounting frame; 522. Telescopic frame; 523. Second guide rod; 524. Spring; 525. Adjusting nut; 526. Third scraper. Detailed Implementation

[0034] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0035] See Figures 1 to 10 The image shows a screen printing device for fine grid lines on solar cells, comprising: a frame 1; a transfer module 2 disposed on the frame 1, the transfer module 2 having a transfer table 21 capable of cyclically transferring solar cells; a drive module 3 disposed on one side of the transfer module 2 with its drive end facing the transfer module 2; a squeegee module 4 disposed on the drive end of the drive module 3, the squeegee module 4 having a printing plate 41 and a first squeegee 42 capable of squeegeeing the paste on the printing plate 41, and a squeegee unit 43 capable of reciprocatingly coating the paste onto the printing plate 41; and a roller pressing module 5 vertically disposed on one side of the squeegee unit 43 with its roller pressing end facing the printing plate 41, the roller pressing module 5 having a pressure roller 51 capable of continuously pressing the paste at a constant pressure and an adjustment unit 52 capable of adjusting the pressure of the pressure roller 51.

[0036] When fine screen printing is required on the surface of a solar cell, an external power source is first connected to drive the drive module 3, which moves the printing module to a preset initial position. Then, the metered paste is evenly poured onto the upper surface of the screen printing plate 41. The drive module 3 is driven again, controlling the first squeegee 42 of the squeegee module 4 to move from the initial position along the printing direction to the termination position, achieving uniform squeegee printing of the paste on the screen and transmitting the paste through the grid pattern to the surface of the solar cell, completing one fine grid line printing operation.

[0037] During the aforementioned printing process, the squeegee unit 43 and the first squeegee 42 operate in coordination. The first squeegee 42 drives the ink on the printing plate 41 to move along the printing direction, allowing the ink to pass through the screen pattern and form a grid structure under the pressure of the squeegee. Simultaneously, the squeegee unit 43 recirculates and redistributes any remaining ink after the first squeegee 42 reaches its stop position, ensuring it re-covers the screen surface and maintaining uniform ink coverage on the printing plate 41 to prevent incomplete printing due to insufficient ink coverage.

[0038] In addition, before the printing operation begins, the roller pressing module 5 pre-presses the paste. The pressure roller 51 located at the front of the printing plate 41 applies uniform pressure to the paste to eliminate uneven paste accumulation and ensure that the paste fully adheres to the surface of the printing plate 41. This effectively reduces the risk of grid line breakage or printing defects caused by local lack of paste during the subsequent printing process.

[0039] After each printing operation is completed, the transfer module 2 operates sequentially according to the control logic, transferring the printed battery cells to the next level station and simultaneously transporting the battery cells to be printed to the printing position, thereby realizing the continuous supply and cyclic operation of battery cells at the printing station and improving production efficiency.

[0040] This invention achieves a highly efficient screen printing process for fine grid lines on solar cells through a collaboratively controlled drive module 3, squeegee module 4, roller pressing module 5, and transfer module 2. This structure can precisely control the distribution and transfer of the printing paste, improving printing consistency and grid line forming quality; through the synergistic effect of the roller pressing and squeegee processes, it effectively solves the problems of missed printing and broken lines.

[0041] The transfer module 2 also includes a turntable 22 that can drive the transfer platform 21 to rotate in a specific direction. Four transfer platforms 21 are arranged circumferentially along the axis of the turntable 22.

[0042] The drive module 3 specifically consists of a third linear actuator 31 that can drive the scratching module 4 to slide back and forth, and a fourth linear actuator 32 that can drive the scratching module 4 to slide longitudinally.

[0043] See Figure 9 As shown: The scraping module 4 further includes a first mounting bracket 44 and a first linear actuator 45 and a second linear actuator 46 capable of longitudinally driving the first scraper 42 and the scraping unit 43 to slide longitudinally, respectively; the first mounting bracket 44 is fixedly disposed on the driving end of the driving module 3; the first linear actuator 45 is vertically fixedly disposed on the driving end of the driving module 3 through the first mounting bracket 44; the first scraper 42 is horizontally fixedly disposed on the driving end of the first linear actuator 45; the second linear actuator 46 is vertically fixedly disposed on one side of the first mounting bracket 44; the scraping unit 43 is horizontally fixedly disposed on the driving end of the second linear actuator 46.

[0044] When fine screen printing is required on solar panels, an external power source is first connected to start the drive module 3, which in turn controls the squeegee module 4 to move to a preset initial position. Then, the first linear driver 45 is activated, driving the first squeegee 42 to move vertically downwards to a preset squeegee height and stop, thus completing the preparation for the first squeegee 42's operation. At this point, the drive module 3 controls the squeegee module 4 to move along the printing direction, driving the first squeegee 42 to squeegee the ink on the screen at the set squeegee height, allowing the ink to be evenly transferred through the screen pattern to the surface of the solar panel, completing one effective grid line printing process.

[0045] The scraper unit 43 is horizontally fixed at the drive end of the second linear actuator 46 and is used to scrape back and evenly distribute residual ink during the printing process. The working height of the scraper unit 43 is precisely controlled by the drive stroke of the second linear actuator 46. The control system can set different scraping heights according to the actual scraping requirements, thereby maintaining the uniformity of ink thickness and effectively avoiding printing defects caused by insufficient ink coverage.

[0046] The first linear actuator 45 is responsible for positioning the first squeegee 42 and controlling the starting height of the squeegee print, while the second linear actuator 46 dynamically adjusts the height of the squeegee unit 43. Through the coordinated and precise control of the two actuators, effective squeegee printing and post-squeegee recovery and redistribution can be achieved, improving the accuracy and stability of the entire screen printing process.

[0047] See Figure 3 , Figure 7 , Figure 9 and Figure 10 As shown: The slurry scraping unit 43 is provided with a second scraper 431 capable of scraping back the slurry and a slurry replenishment box 432 capable of temporarily replenishing the slurry; the second scraper 431 is fixedly installed vertically on one side of the driving end of the second linear actuator 46; the slurry inlet of the slurry replenishment box 432 is fixedly installed horizontally on one side of the second scraper 431, and the bottom of the slurry replenishment box 432 is also provided with a slurry outlet, which is flush with the bottom of the second scraper 431.

[0048] The scraping height of the second squeegee 431 is slightly higher than that of the first squeegee 42, forming a height difference matching structure for the squeegee printing and paste return functions. During the actual printing process, the first squeegee 42, under the control of the drive module 3, moves from the initial position to the final position along the printing direction to evenly scrape the paste onto the surface of the printing plate 41 and transfer it through the screen printing pattern onto the solar cell. After the first squeegee 42 completes printing, it immediately returns to the initial position. The second squeegee 431, under the control of the drive module 3, slides in the same direction, its scraping height slightly higher than that of the first squeegee 42, preventing it from pressing the paste back into the screen. Instead, it performs a scraping operation on the paste remaining at the final position.

[0049] Specifically, the second squeegee 431 can, without affecting the already printed pattern, re-spread and evenly cover the ink accumulated at the termination position onto the surface of the screen printing plate 41, distributing it along the subsequent printing path for reuse in the next printing operation of the first squeegee 42. This structural design achieves functional division and efficient collaboration between printing and ink return operations, ensuring ink reuse efficiency and uniform coverage.

[0050] By using two squeegees with a height difference, efficient coordinated control of the ink scraping and repainting processes is achieved. The first squeegee 42 is used for high-precision grid line printing, while the second squeegee 431 is responsible for non-interferingly scraping and re-spreading of residual ink at the termination point, ensuring that the ink distribution on the surface of the printing plate 41 remains uniform. This design not only effectively avoids printing defects caused by ink waste and localized accumulation, but also improves printing efficiency and grid line pattern consistency, enhancing the stability and reliability of the entire screen printing system. It is particularly suitable for solar cell manufacturing processes that require high ink utilization and printing quality.

[0051] See Figure 5 and Figure 6 As shown, the second scraper 431 consists of a first collecting part 4311, a collecting strip 4312, and a second collecting part 4313, which are fixedly connected in sequence. The first collecting part 4311 and the second collecting part 4313 are arranged opposite to each other at both ends of the collecting strip 4312. Both are arranged at an angle towards the collecting strip 4312, thus forming a U-shaped structure with the collecting strip 4312 in the middle. This structural design not only creates a return channel with good paste guiding characteristics, but also allows the second scraper 431 to smoothly recover and evenly spread the residual paste at the end position of the printing plate 41 without interfering with the already printed area during the scraping operation.

[0052] Specifically, during the sliding motion of the second doctor blade 431 along the printing direction with the doctor blade mechanism, the first collecting section 4311 and the second collecting section 4313, through their inclined guiding function, can effectively guide the accumulated paste, causing it to flow back to the central collecting strip 4312 area and spread evenly along the collecting strip 4312, ultimately achieving paste redistribution. This "U"-shaped combined structure design not only improves the controllability and stability of the paste return path but also enhances the uniformity and continuity of the paste when it spreads laterally on the surface of the printing plate 41.

[0053] See Figure 10 As shown: The slurry filling box 432 consists of a slurry storage chamber 4321 and a slurry guiding chamber 4322 that are stacked on top of each other and connected to each other; the top of the slurry storage chamber 4321 and the bottom of the slurry guiding chamber 4322 are respectively provided with a slurry outlet and a slurry inlet.

[0054] Both the slurry storage bin 4321 and the slurry guiding bin 4322 adopt a rectangular bin structure arranged in a long strip shape. The overall size of the slurry storage bin 4321 is larger than that of the slurry guiding bin 4322 to provide a more sufficient slurry storage capacity. The slurry guiding bin 4322 is located near the bottom area of ​​the second scraper 431, and its bottom has a through-hole slurry outlet. The slurry outlet is flush with the bottom edge of the second scraper 431, so that the slurry in the slurry guiding bin 4322 can maintain continuous contact with the slurry that the second scraper 431 comes into contact with during the scraping process.

[0055] During the printing process, when the second squeegee 431 performs the back-scraping operation, it evenly spreads the residual paste at the end position of the printing plate 41 along the printing direction. At this time, the paste in the guide squeegee 4322 is always in contact with the paste on the printing path. When uneven paste distribution or local paste shortage occurs during the back-scraping process, because the guide squeegee 4322 is in close contact with the printing surface, the paste stored inside will quickly flow to the paste-deficient area under the action of gravity, automatically completing the paste compensation and coverage, thereby realizing the instant paste replenishment function in the printing path, ensuring that the paste is always evenly and continuously distributed on the surface of the printing plate 41.

[0056] By setting up a properly sized paste storage chamber 4321 and a paste guiding chamber 4322, and aligning the paste outlet at the bottom of the paste guiding chamber 4322 with the bottom edge of the second doctor blade 431, the paste in the paste guiding chamber 4322 can contact and compensate for any missing paste areas in the return path during the printing process. This not only enhances the automation and continuity of paste delivery but also effectively avoids printing defects such as missed prints and broken lines caused by localized paste interruptions.

[0057] See Figure 10 As shown: The slurry filling box 432 further includes a pressure plate 4323 capable of pressurizing the slurry in the slurry storage bin 4321 and a first guide rod 4324 capable of longitudinally guiding the movement of the pressure plate 4323; two first guide rods 4324 are provided, and the two first guide rods 4324 are arranged perpendicularly to each other in the slurry storage bin 4321; the pressure plate 4323 is arranged horizontally in the slurry storage bin 4321 and has a through hole on its surface for the first guide rod 4324 to pass through and slides in cooperation with the first guide rod 4324.

[0058] To ensure a continuous supply and uniform distribution of ink during the printing process, a pressure plate 4323 is installed inside the ink storage tank 4321 to apply stable pressure to the ink. This pressure plate 4323 uses its own weight to exert a continuous downward pressure on the ink within the storage tank 4321, thus promptly pushing the ink from the storage tank 4321 into the connected guide tank 4322 in case of localized ink shortages or insufficient ink return on the printing plate 41.

[0059] With the coordinated structure forming a stable ink guiding channel in the contact area between the ink guiding chamber 4322 and the surface of the printing plate 41, the continuous pressure of the pressure plate 4323 causes the ink to flow rapidly into the ink guiding chamber 4322 under the combined action of gravity and pressure. Furthermore, the ink is precisely replenished to the ink-deficient areas on the surface of the printing plate 41 through the ink outlet at the bottom of the ink guiding chamber 4322. This method achieves uninterrupted compensation of ink supply in the printing path, making it particularly suitable for applications requiring high-precision screen printing with strict requirements for ink thickness and uniform coverage.

[0060] By installing a pressure plate 4323 inside the slurry storage tank 4321, continuous and stable pressure is applied to the slurry, effectively improving the slurry conveying efficiency from the storage tank 4321 to the slurry tank 4322. When a localized slurry shortage occurs on the printing plate 41, this structure enables rapid and automatic slurry replenishment, ensuring the uniformity and continuity of the slurry in the printing path.

[0061] See Figure 7 and Figure 10 As shown: The adjustment unit 52 includes a second mounting bracket 521, a telescopic bracket 522, a second guide rod 523, a spring 524, and an adjusting nut 525; the telescopic bracket 522 is mounted on one side of the driving end of the second linear actuator 46 via the second mounting bracket 521; two opposing second guide rods 523 are also vertically mounted on the telescopic bracket 522, with the rod portion of the second guide rod 523 passing through the second mounting bracket 521 and slidingly engaging with it; the pressure roller 51 is rotatably mounted horizontally inside the telescopic bracket 522; the spring 524 is coaxially sleeved on the outside of the second guide rod 523, with both ends abutting against the adjacent surfaces of the telescopic bracket 522 and the second mounting bracket 521 respectively; the adjusting nut 525 is screwed onto the top of the second guide rod 523.

[0062] When the longitudinal pressing height of the pressure roller 51 needs to be adjusted, its axial position on the guide shaft can be adjusted by rotating the adjusting nut 525 according to the preset pressing parameters. This adjustment action will drive the connected telescopic frame 522 structure to extend and retract axially, thereby achieving precise control of the height of the pressure roller 51 in the vertical direction. By adjusting the maximum extension length of the telescopic frame 522, the contact gap between the pressure roller 51 and the surface of the printing plate 41 can be precisely set to match the control requirements for the uniformity of slurry re-coating under different thickness or viscosity conditions.

[0063] After the paste is scraped back by the second doctor blade 431 and re-covers the surface of the screen printing plate 41, the pressure roller 51 applies low-pressure pressure at a set height. This low-pressure pressure not only further flattens the localized areas of paste accumulation but also enhances the adhesion between the paste and the screen surface, ensuring good uniformity of the paste coated on the printing plate 41 in both the transverse and longitudinal directions. This effectively avoids paste leakage, insufficient paste, or incomplete coverage, laying the foundation for the stability of subsequent grid line printing.

[0064] See Figure 7 As shown: The adjustment unit 52 further includes a third scraper 526 capable of scraping off the slurry adhering to the outer wall of the pressure roller 51; the third scraper 526 is horizontally arranged on one side of the telescopic frame 522 along the long side direction of the telescopic frame 522 and the scraping end is closely attached to the side wall of the pressure roller 51.

[0065] The third scraper 526 enables the real-time scraping of the paste adhering to the outer wall of the pressure roller 51 when the paste on the printing plate 41 is continuously pressed by the pressure roller 51.

[0066] The third scraper 526 maintains appropriate contact with the outer wall of the pressure roller 51. When the pressure roller 51 continuously rolls the paste on the screen printing plate 41, if the paste adheres to the outer wall surface of the pressure roller 51 due to adhesion or excessive extrusion, the third scraper 526 can continuously scrape off the outer surface of the pressure roller 51 during its rotation.

[0067] This invention can not only uniformly scrape the slurry in real time, but also prevent slurry leakage and thin scraping.

[0068] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A device for screen printing fine grid lines for solar cells, characterized in that, include: frame; A transfer module is mounted on the frame, and the transfer module is equipped with a transfer table capable of cyclically transferring the battery cells; A drive module is disposed on one side of the transfer module with its drive end facing the transfer module; The scraping module is located at the drive end of the drive module. The scraping module is equipped with a printing plate, a first scraper capable of scraping the paste on the printing plate, and a scraping unit capable of reciprocatingly coating the paste onto the printing plate. The roller pressing module is vertically arranged on one side of the scraping unit with the roller pressing end facing the printing plate. The roller pressing module is equipped with a pressure roller that can continuously press the slurry at a constant pressure and an adjustment unit that can adjust the pressure of the pressure roller. By applying uniform pressure to the paste using the pressure roller, uneven paste accumulation can be eliminated while ensuring that the paste fully adheres to the printing plate surface, reducing grid line breakage or printing defects caused by localized paste shortages during subsequent printing processes. The scraping module also includes a first mounting bracket and a first linear driver and a second linear driver that can respectively drive the first scraper and the scraping unit to slide longitudinally. The first mounting bracket is fixedly mounted on the drive end of the drive module; The first linear actuator is vertically fixed on the first mounting bracket; the first scraper is horizontally fixed on the drive end of the first linear actuator. The second linear actuator is fixedly mounted vertically on one side of the first mounting bracket; the scraper unit is fixedly mounted horizontally on the drive end of the second linear actuator. The scraping unit is equipped with a second scraper capable of scraping back the slurry and a slurry replenishment box capable of temporarily storing and replenishing the slurry; The second scraper is fixedly mounted vertically on one side of the drive end of the second linear driver; The grout box is fixedly installed horizontally on one side of the second scraper, and the bottom of the grout box is also provided with a grout outlet, which is flush with the bottom of the second scraper. The second scraper consists of a first slurry collecting part, a slurry collecting strip, and a second slurry collecting part that are fixedly connected in sequence; The first and second collecting portions are disposed opposite to each other at both ends of the collecting strip; The slurry filling box consists of a slurry storage chamber and a slurry guiding chamber that are stacked on top of each other and connected to each other; The top of the slurry storage chamber and the bottom of the slurry guiding chamber are respectively provided with a slurry outlet and a slurry inlet; The slurry filling box also includes a pressure plate capable of pressurizing the slurry in the slurry storage bin and a first guide rod capable of longitudinally guiding the movement of the pressure plate; Two first guide rods are provided, and the two first guide rods are arranged perpendicularly to each other inside the slurry storage tank; The pressure plate is horizontally positioned inside the slurry storage chamber and has a through hole on its surface through which the first guide rod passes, and it slides in cooperation with the first guide rod.

2. The device for screen printing fine grid lines for solar cells according to claim 1, characterized in that, The adjustment unit includes a second mounting bracket, a telescopic bracket, a second guide rod, a spring, and an adjusting nut; The telescopic frame is mounted on one side of the drive end of the second linear actuator via a second mounting bracket; the telescopic frame is also vertically mounted with two opposing second guide rods, the rod portions of which pass through the second mounting bracket and slide in cooperation with the second mounting bracket. The pressure roller is rotatably mounted in a horizontal position within the telescopic frame; The spring is coaxially sleeved and installed outside the second guide rod, with both ends abutting against the adjacent surfaces of the telescopic frame and the second mounting frame, respectively. The adjusting nut is screwed onto the top of the second guide rod.

3. The device for screen printing fine grid lines for solar cells according to claim 2, characterized in that, The adjustment unit also includes a third scraper capable of scraping off the slurry adhering to the outer wall of the pressure roller; The third scraper is horizontally positioned on one side of the telescopic frame along its long side, with its scraping end close to the side wall of the pressure roller.

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