A squeegee device for screen printing in the production of solar cells

Abstract

The application relates to the technical field of solar cell pieces, and discloses a squeegee device for screen printing of solar cell piece production, which comprises a convex mounting plate, the lower side of the convex mounting plate is provided with a mounting groove, the inner wall of the convex mounting plate in the mounting groove is fixedly provided with a fixed plate through a short inner hexagonal bolt, the structure design of the convex mounting plate matched with the mounting groove, the fixed plate and a reinforcing plate is adopted, and the squeegee blade made of polyurethane rubber material is matched with a positioning mechanism, so that stable and reliable installation and accurate positioning are realized, the elasticity of the polyurethane rubber adapts to the micro ups and downs of the screen surface, effective transfer of the printing paste is ensured, the positioning mechanism ensures that the squeegee blade is stably installed, the reinforcing plate performs rigid compensation on the flexibility of the squeegee blade, the uneven distribution of force points caused by the flexibility of the traditional rubber squeegee is avoided, so that the conditions such as reduction of the burr at the edge of the grid line, fluctuation of the width of the fine grid line and instability of the paste transfer amount are reduced, and the printing quality and product yield are improved.

Description

Technical Field

[0001] This application relates to the field of solar cell technology, specifically to a squeegee device for screen printing in the production of solar cells. Background Technology

[0002] The screen printing squeegee device used in the production of solar cells is a key piece of equipment that uses a squeegee to press a conductive metal paste through the mesh of a screen onto a silicon wafer to form circuits or electrodes.

[0003] Currently, in the screen printing process for solar cell production, the core structure of the squeegee device usually consists of a mounting plate and a detachable squeegee blade. The mounting plate serves as a fixed base, and its inner wall is fixed with rubber squeegee blades through precision slots or bolts, ensuring that the squeegee blades protrude from the mounting plate plane by a specific amount. This design not only ensures the effective transfer of ink during printing, but also adapts to the micro-undulations of the screen surface through the elastic deformation characteristics of the rubber material.

[0004] However, traditional rubber squeegees have mechanical uniformity defects during the printing process. Due to the inherent flexibility of rubber materials, when the squeegee contacts the screen with a certain pressure, the deformation at different positions is difficult to be completely consistent, resulting in uneven distribution of the actual force application points. This may lead to serrated burrs on the grid line edges, fluctuations in the width of fine grid lines exceeding the design tolerance, and unstable slurry transfer, causing batch-to-batch differences in cell efficiency. Utility Model Content

[0005] The purpose of this application is to provide a squeegee device for screen printing in the production of solar cells, which solves the mechanical uniformity defects of traditional rubber squeegees in the printing process. Due to the inherent flexibility of rubber materials, when the squeegee contacts the screen with a certain pressure, the deformation at different positions is difficult to be completely consistent, resulting in uneven distribution of the actual force application points. This may lead to serrated burrs on the grid line edges, fluctuations in the width of fine grid lines exceeding the design tolerance, and unstable slurry transfer causing batch-to-batch differences in solar cell efficiency.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This application provides a squeegee device for screen printing in the production of solar cells, including a convex mounting plate. The lower side of the convex mounting plate has a mounting groove. A fixing plate is fixedly installed on the inner wall of the convex mounting plate inside the mounting groove by short hexagonal bolts. A reinforcing plate is welded to the lower end of the middle part of the fixing plate. A squeegee blade is slidably passed through the outer wall of the reinforcing plate. The squeegee blade is made of polyurethane rubber. A positioning mechanism for positioning the squeegee blade is provided on the inner wall of the convex mounting plate.

[0007] By adopting the above technical solution, and through the structural design of a convex mounting plate combined with a mounting groove, a fixing plate, and a reinforcing plate, and with a polyurethane rubber squeegee blade in conjunction with a positioning mechanism, stable and reliable installation and precise positioning are achieved. The elasticity of the polyurethane rubber adapts to the microscopic undulations of the screen surface, ensuring effective transfer of ink during printing. The positioning mechanism ensures that the squeegee blade is installed firmly, and the reinforcing plate provides rigid compensation for the flexibility of the squeegee blade, avoiding the problem of uneven force distribution caused by the flexibility of traditional rubber squeegees. This reduces issues such as burrs on the grid edges, fluctuations in the width of fine grid lines, and unstable ink transfer, thereby improving printing quality and product yield.

[0008] Optionally, the inner wall of the convex end of the convex mounting plate is provided with a set of mounting holes.

[0009] By adopting the above technical solution, the device can be easily installed on the mounting surface of the screen printing operation through the setting of the mounting holes.

[0010] Optionally, the lower corners on both sides of the reinforcing plate are rounded.

[0011] By adopting the above technical solution, the lower corners of both sides of the reinforcing plate are rounded, which makes it easier for the reinforcing plate to be inserted into the scraper blade and reduces damage to the scraper blade.

[0012] Optionally, two symmetrically arranged base blocks are fixedly installed on the outer wall of one side of the convex mounting plate, and the same slide rod is slidably passed through the inner wall of the two base blocks.

[0013] By adopting the above technical solution, the convex mounting plate can fix the two base blocks, and the two base blocks can position and fix the slide rod, such as... Figure 5 As mentioned above, the slide bar and the base block are generally positioned using positioning keys and keyways.

[0014] Optionally, two sliders are slidably passed through the outer wall of the slide rod. The lower ends of the two sliders are integrally fixed with side ears. The sliders and side ears are made of polyurethane rubber. The upper ends of the two sliders are respectively screwed with positioning bolts, and the positioning bolts abut against the outer wall of the slide rod. The side ears are triangular in shape, and the inclined surfaces of the two side ears are opposite to each other. The outer walls of the two side ears are in contact with the outer wall of the scraper blade.

[0015] By adopting the above technical solution, the slide bar can provide sliding support for the slider, and the slider can fix the side ears. The side ears and the slider are made of polyurethane rubber, and the side of the two side ears facing each other is set with an inclined surface to guide and scrape the printing paste. The slider can slide on the slide bar, and the distance between the two side ears can be adjusted according to the screen width. The positioning bolt can be positioned when the side ears and the slider move to an appropriate distance.

[0016] Optionally, the positioning mechanism includes multiple sets of long hexagonal socket head cap screws spirally inserted into the inner wall of the convex mounting plate, and each of the long hexagonal socket head cap screws spirally inserted through the reinforcing plate and the scraper blade, and each of the long hexagonal socket head cap screws is screwed with a nut at its tail end.

[0017] By adopting the above technical solution, long internal hex bolts and nuts can be used to position the reinforcing plate, scraper blade, and convex mounting plate.

[0018] Compared with the prior art, the beneficial effects of the technical solution of this application are as follows: This technical solution employs a structural design combining a convex mounting plate with a mounting groove, a fixing plate, and a reinforcing plate. The polyurethane rubber squeegee blade, along with a positioning mechanism, achieves stable and reliable installation and precise positioning. The elasticity of the polyurethane rubber adapts to the microscopic undulations of the screen surface, ensuring effective ink transfer during printing. The positioning mechanism ensures the squeegee blade is securely installed, and the reinforcing plate provides rigid compensation for the blade's flexibility, avoiding the uneven force distribution caused by the flexibility of traditional rubber squeegees. This reduces issues such as burrs at the grid edges, fluctuations in the width of fine grid lines, and unstable ink transfer, thereby improving printing quality and product yield. Attached Figure Description

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is an axial view schematic diagram of a squeegee device for screen printing in the production of solar cells according to this application; Figure 2 This is a left-side cross-sectional schematic diagram of a squeegee device for screen printing in the production of solar cells according to this application; Figure 3 This is a bottom view of a squeegee device for screen printing in the production of solar cells according to this application. Figure 4 This application relates to a squeegee device for screen printing in the production of solar cells; Figure 5 This application relates to a squeegee device for screen printing in the production of solar cells.

[0020] In the diagram: 1. Convex mounting plate; 2. Mounting groove; 3. Short hex socket head cap screw; 4. Fixing plate; 5. Reinforcing plate; 6. Scraper blade; 7. Long hex socket head cap screw; 8. Nut; 9. Mounting hole; 10. Base block; 11. Slide rod; 12. Slider; 13. Side lug; 14. Positioning bolt; 15. Rounded corner. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-5 This application provides a technical solution: a squeegee device for screen printing in the production of solar cells, including a convex mounting plate 1, a mounting groove 2 is provided on the lower side of the convex mounting plate 1, a fixing plate 4 is fixedly installed on the inner wall of the convex mounting plate 1 located inside the mounting groove 2 by short internal hex bolts 3, a reinforcing plate 5 is welded to the lower end of the middle part of the fixing plate 4, a squeegee blade 6 is slidably provided on the outer wall of the reinforcing plate 5, the squeegee blade 6 is made of polyurethane rubber, and a positioning mechanism for positioning the squeegee blade 6 is provided on the inner wall of the convex mounting plate 1; In the technical solution of this application, by adopting a structural design of convex mounting plate 1 with mounting groove 2, fixing plate 4 and reinforcing plate 5, and polyurethane rubber squeegee blade 6 with positioning mechanism, stable and reliable installation and precise positioning are achieved. The elasticity of polyurethane rubber adapts to the micro-undulations of the screen surface, ensuring effective transfer of ink during printing. The positioning mechanism ensures that the squeegee blade 6 is installed firmly, and the reinforcing plate 5 provides rigid compensation for the flexibility of the squeegee blade 6, avoiding the problem of uneven force distribution caused by the flexibility of traditional rubber squeegees. This reduces burrs on grid line edges, fluctuations in the width of fine grid lines, and unstable ink transfer, thereby improving printing quality and product yield.

[0023] In the technical solution of this application, such as Figures 1-3 As shown, two symmetrically arranged base blocks 10 are fixedly installed on the outer wall of one side of the convex mounting plate 1. The same sliding rod 11 slides through the inner wall of the two base blocks 10. The convex mounting plate 1 can fix the two base blocks 10, and the two base blocks 10 can position and fix the sliding rod 11. Figure 5The slide rod 11 and the base block 10 are generally positioned using a positioning key and a keyway. Two sliders 12 are slidably mounted on the outer wall of the slide rod 11. The lower ends of the two sliders 12 are integrally fixed with side ears 13. The sliders 12 and side ears 13 are made of polyurethane rubber. The upper ends of the two sliders 12 are respectively screwed with positioning bolts 14, and the positioning bolts 14 abut against the outer wall of the slide rod 11. The side ears 13 are triangular in shape, and the inclined surfaces of the two side ears 13 are opposite to each other. The outer walls of the two side ears 13 are in contact with the outer wall of the scraper blade 6. The slider 12 is supported by the slide rod 11, and the slider 12 can fix the side ears 13. The side ears 13 and the slider 12 are made of polyurethane rubber. The side of the two side ears 13 facing each other is beveled, which can guide and scrape the printing paste. The slider 12 can slide on the slide rod 11, and the distance between the two side ears 13 can be adjusted according to the width of the screen. The positioning bolt 14 can be positioned when the side ears 13 and the slider 12 move to an appropriate distance.

[0024] In the technical solution of this application, such as Figures 1-3 As shown, the positioning mechanism includes multiple sets of long hexagonal socket bolts 7 spirally inserted into the inner wall of the convex mounting plate 1, and each long hexagonal socket bolt 7 spirally passes through the reinforcing plate 5 and the scraper blade 6. The tail end of each long hexagonal socket bolt 7 is spirally fitted with a nut 8. The long hexagonal socket bolts 7 and the nuts 8 can play a positioning role for the reinforcing plate 5, the scraper blade 6 and the convex mounting plate 1.

[0025] In the technical solution of this application, such as Figures 1-3 As shown, a set of mounting holes 9 are provided on the inner wall of the convex end of the convex mounting plate 1. The mounting holes 9 make it easy to install the device onto the mounting surface of the screen printing operation. The lower corners on both sides of the reinforcing plate 5 are rounded 15. The rounded corners on both sides of the reinforcing plate 5 make it easier to insert the reinforcing plate 5 into the squeegee 6 and reduce damage to the squeegee 6.

[0026] In use, the mounting holes 9 on the inner wall of the convex end of the convex mounting plate 1 are fixed to the screen printing installation surface. The fixing plate 4 is fixed in the mounting groove 2 of the convex mounting plate 1 with short hexagonal bolts 3. The squeegee 6 is inserted into the reinforcing plate 5 welded to the lower end of the fixing plate 4. The rounded corners 15 on both sides of the lower end of the reinforcing plate 5 are set to reduce damage to the squeegee 6. The polyurethane rubber squeegee 6 adapts to the micro-undulations of the screen surface with its own elasticity. The long hexagonal bolts 7 are spirally inserted into the convex mounting plate 1, the reinforcing plate 5 and the squeegee 6 and are positioned with nuts 8. At the same time, on the sliding rod 11 fixed to the base block 10 on one side of the convex mounting plate 1, two polyurethane rubber sliders 12 with triangular opposing inclined side ears 13 at the lower end can slide to adjust the spacing and are positioned with positioning bolts 14. During printing, the side ears 13 guide and scrape the paste. The positioning mechanism ensures that the squeegee 6 is installed firmly. The reinforcing plate 5 provides rigid compensation for the flexibility of the squeegee 6, avoids uneven distribution of force points, ensures effective transfer of paste, and improves printing quality and product yield.

Claims

1. A squeegee device for screen printing in the production of solar cells, characterized in that: The convex mounting plate (1) has a mounting groove (2) on its lower side. A fixing plate (4) is fixedly installed on the inner wall of the convex mounting plate (1) inside the mounting groove (2) by short internal hex bolts (3). A reinforcing plate (5) is welded to the lower end of the middle part of the fixing plate (4). A scraper blade (6) is slidably installed on the outer wall of the reinforcing plate (5). The scraper blade (6) is made of polyurethane rubber. A positioning mechanism for positioning the scraper blade (6) is provided on the inner wall of the convex mounting plate (1).

2. The squeegee device for screen printing in solar cell production according to claim 1, characterized in that, The inner wall of the convex end of the convex mounting plate (1) is provided with a set of mounting holes (9).

3. The squeegee device for screen printing in solar cell production according to claim 1, characterized in that, The lower corners on both sides of the reinforcing plate (5) are rounded (15).

4. The squeegee device for screen printing in solar cell production according to claim 1, characterized in that, Two symmetrically arranged base blocks (10) are fixedly installed on the outer wall of one side of the convex mounting plate (1), and the same slide rod (11) slides through the inner wall of the two base blocks (10).

5. A squeegee device for screen printing in solar cell production according to claim 4, characterized in that, Two sliders (12) are slidably passed through the outer wall of the slide rod (11). The lower ends of the two sliders (12) are respectively integrally fixed with side ears (13). The sliders (12) and side ears (13) are made of polyurethane rubber. The upper ends of the two sliders (12) are respectively spirally installed with positioning bolts (14), and the positioning bolts (14) abut against the outer wall of the slide rod (11). The side ears (13) are triangular, and the inclined surfaces of the two side ears (13) are opposite to each other. The outer walls of the two side ears (13) are in contact with the outer wall of the scraper blade (6).

6. A squeegee device for screen printing in solar cell production according to claim 1, characterized in that, The positioning mechanism includes multiple sets of long internal hexagonal bolts (7) spirally inserted into the inner wall of the convex mounting plate (1), and each of the long internal hexagonal bolts (7) spirally inserted through the reinforcing plate (5) and the scraper blade (6), and each of the long internal hexagonal bolts (7) is spirally fitted with a nut (8) at the tail end.

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