Scraper holder for silk-screen printing of photovoltaic cells

Abstract

The utility model relates to the field of photovoltaic technology, in particular to a scraper holder for silk-screen printing of photovoltaic cells, which comprises a positioning plate slidably connected with a slide rail at the bottom of a mounting plate and an air cylinder fixed on one side of the mounting plate and pushing the positioning plate to slide along the slide rail. A connecting plate for mounting a scraping strip is rotationally connected between the vertical plates, an adjusting pointer is arranged at one end of a rotating shaft, connected with the two vertical plates, of the connecting plate, locking bolts are mounted on the two sides of the connecting plate, each vertical plate is provided with an arc-shaped limiting groove with the rotating shaft as the circle center, and the locking bolts are in sliding connection with the limiting grooves. When the scraper is used, the connecting plate between the vertical plates is rotated, so that the connecting plate rotates around the axis of the rotating shaft by a certain angle, and the scraper mounted on the connecting plate is driven to rotate synchronously, so that the angle of the scraper is adjusted, and different printing requirements are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic technology field, concretely relates to a doctor blade frame for photovoltaic cell screen printing. BACKGROUND

[0002] Photovoltaic cell screen printing is a key process commonly used in the manufacture of photovoltaic cells, which is mainly used for printing conductive grid lines and back electrodes on the surface of solar cell pieces. This process involves precisely printing conductive paste (usually silver paste or aluminum paste) through a screen onto the cell piece to form fine metal lines, which act as electrodes to collect the current generated by the photovoltaic cell and conduct it to the external circuit; the squeegee is an important tool for manufacturing solar photovoltaic cells, mainly used for uniformly squeegeeing conductive paste (such as silver paste, aluminum paste) through a screen onto the surface of photovoltaic cell substrates (such as silicon wafers). It plays a key role in the screen printing process, ensuring that the paste is deposited on the cell piece in the right thickness and shape to form conductive lines or back electrodes.

[0003] For photovoltaic cell screen printing technology, there are many existing technologies, for example:

[0004] Chinese patent publication No. CN218928921U discloses a squeegee for photovoltaic cell screen printing, which comprises a squeegee body, a squeegee strip on one side of the squeegee body, and a clamp handle on the other side of the squeegee body, wherein the squeegee strip includes a pattern area and a non-pattern area, the pattern area is provided with a plurality of parallel grooves, the grooves are formed by the bottom of the squeegee strip being recessed inward, the positions of the grooves correspond one-to-one to the positions of the grid lines of the cell piece, and the axial direction of the grooves is the same as the printing movement direction of the screen printing squeegee.

[0005] As can be seen, most squeegees used for photovoltaic cell screen printing currently have squeegee strips, and the structural parameters of the squeegee strips are adjusted to achieve the stacking of fine grid heights in one printing, increase the fine grid aspect ratio, and thus improve the solar conversion efficiency. However, before printing, the inclination angle needs to be set according to the position and distance between the squeegee strip and the photovoltaic cell substrate to make the squeegee strip print more uniformly on the substrate. However, most squeegee frames today only fix the squeegee strip and cannot adjust the angle of the squeegee strip.

[0006] In view of this, we propose a squeegee frame for photovoltaic cell screen printing. UTILITY MODEL CONTENT

[0007] The utility model aims to provide a squeegee frame for photovoltaic cell screen printing to solve the problem of angle adjustment of the squeegee.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0009] A scraper frame for screen printing of photovoltaic cells, comprising a positioning plate in sliding connection with the bottom slide rail of the mounting plate and a gas cylinder fixed to one side of the mounting plate to push the positioning plate to slide along the slide rail, both ends of the positioning plate are fixed with vertical plates, a connecting plate on which a scraper is mounted is rotatably connected between the vertical plates, and the connecting plate is provided with an adjusting pointer at one end of the rotating shaft connected with the two vertical plates, locking bolts are mounted on both sides of the connecting plate, and each vertical plate is provided with an arc-shaped limiting groove with the rotating shaft as the center, and the locking bolt is in sliding connection with the limiting groove.

[0010] As a further scheme of the present application: a scraper body and a locking plate are sequentially arranged on one side of the connecting plate, and the scraper is mounted between the scraper body and the locking plate.

[0011] As a further scheme of the present application: a clamping groove is formed on one side of the connecting plate, and a clamping block is arranged on the side of the scraper body close to the connecting plate, and the clamping block is clamped and fixed with the clamping groove.

[0012] As a further scheme of the present application: an auxiliary groove is formed on the side of the scraper body close to the locking plate, the scraper is clamped in the auxiliary groove, and the scraper is detachable.

[0013] As a further scheme of the present application: the locking plate and the scraper body are both provided with mounting holes, and the locking plate and the scraper body are clamped and fixed by inserting fasteners into the mounting holes.

[0014] As a further scheme of the present application: the scraper body is made of high-hardness material with a Shore hardness value between 80A and 90A, and the scraper is made of low-hardness material with a Shore hardness value between 60A and 70A.

[0015] As a further scheme of the present application: grooves are formed on the same side of the scraper body and the scraper, and the positions and numbers of the grooves correspond to the grid lines on the photovoltaic cell.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] 1. The scraper frame for screen printing of photovoltaic cells is rotated around the axis of the rotating shaft by rotating the connecting plate between the vertical plates, thereby driving the scraper mounted on the connecting plate to rotate synchronously, so as to adjust the angle of the scraper to meet different printing requirements.

[0018] 2. The squeegee frame for screen printing of photovoltaic cells, the squeegee body is made of high-hardness polyurethane material with hardness of 80A-90A, and the squeegee strip is made of low-hardness material with hardness of 60A-70A. The hardness difference ensures that the overall structure of the squeegee remains stable during printing, and the squeegee strip has moderate softness when it contacts the screen, which can better adapt to the deformation of the screen.

[0019] 3. The squeegee frame for screen printing of photovoltaic cells, the squeegee body and the squeegee strip are both provided with grooves, and the positions and numbers of the grooves correspond to the grid lines on the photovoltaic cell. During the printing preparation stage, the operator adjusts the groove positions of the squeegee and the squeegee strip according to the grid line design of the cell, to ensure that the grooves are accurately aligned with the grid lines. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structure schematic view of the squeegee frame of the present application.

[0021] Figure 2 It is a structure bottom view of the squeegee frame of the present application.

[0022] Figure 3 It is a structure schematic view of the squeegee of the present application.

[0023] Figure 4 It is a structure exploded schematic view I of the squeegee of the present application.

[0024] Figure 5 It is a structure exploded schematic view II of the squeegee of the present application.

[0025] The meanings of the various reference numerals in the drawings are as follows:

[0026] 1, mounting plate; 2, slide rail; 3, positioning plate; 4, air cylinder; 5, vertical plate; 6, connecting plate; 7, adjustment pointer; 8, limiting groove; 9, locking bolt; 10, clamping groove; 11, squeegee body; 12, clamping block; 13, auxiliary groove; 14, squeegee strip; 15, locking plate. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] EMBODIMENT

[0029] Most of the squeegee used for screen printing of photovoltaic cells currently are provided with squeegee strips 14, and the structural parameters of the squeegee strips 14 are adjusted to achieve the height of the fine grid by one printing, increase the height-width ratio of the fine grid, and thus improve the solar energy conversion efficiency. However, before printing, the inclination angle is often set according to the position and distance between the squeegee strip 14 and the photovoltaic cell substrate, so that the squeegee strip 14 can be more uniformly printed on the substrate. However, most of the squeegee frames today only fix the squeegee strip 14 and cannot adjust the angle of the squeegee strip 14.

[0030] Therefore, with reference to Figures 1 to 3 The embodiment aims to provide a squeegee frame for screen printing of photovoltaic cells, which comprises a mounting plate 1, a sliding rail 2 mounted at the bottom of the mounting plate 1, a positioning plate 3 in sliding connection with the sliding rail 2, and a gas cylinder 4 fixed to one side of the mounting plate 1 and pushing the positioning plate 3 to slide along the sliding rail 2. Both ends of the positioning plate 3 are fixed with vertical plates 5, and a connecting plate 6 on which the squeegee strip 14 is mounted is rotatably connected between the vertical plates 5. In use, the positioning plate 3 is pushed to slide by the extension end of the gas cylinder 4, and moves along the sliding rail 2, which provides a guiding action for the up-and-down sliding of the squeegee body 11, ensuring that the positioning plate 3 can move vertically.

[0031] In order to facilitate accurate angle adjustment of the squeegee strip 14 and fixation of the squeegee body 11 after adjustment, one end of the rotating shaft connecting the connecting plate 6 and the two vertical plates 5 is provided with an adjustment pointer 7, and the connecting plate 6 is provided with locking bolts 9 on both sides. Each vertical plate 5 is provided with a circular arc-shaped limiting groove 8 with the rotating shaft as the center. The locking bolts 9 are in sliding connection with the limiting groove 8. When adjusting the angle, the connecting plate 6 is rotatably connected with the vertical plates 5 through the rotating shaft between the vertical plates 5, and the connecting plate 6 can be adjusted in angle around the shaft. On one side of the vertical plate 5, the adjustment pointer 7 penetrates the vertical plate 5 to indicate the current angle position of the squeegee strip 14, facilitating the operator to make fine adjustment of the angle. The connecting plate 6 is provided with a locking bolt 9 on each side, which is installed in the limiting groove 8 of the vertical plate 5. The limiting groove 8 is in a circular arc shape, allowing the connecting plate 6 to rotate by a certain angle around the rotating shaft. When the operator needs to adjust the angle of the squeegee strip 14, the locking bolt 9 is first loosened, so that the connecting plate 6 can slide freely in the limiting groove 8. With the rotation of the connecting plate 6, the locking bolt 9 slides in the limiting groove 8, ensuring that the adjustment range is limited within a reasonable range to prevent system instability caused by excessive rotation. The adjustment pointer 7 displays the current angle of the squeegee strip 14, and the operator adjusts the squeegee angle according to the position of the adjustment pointer 7. After adjustment is completed, the locking bolt 9 is tightened to fix the connecting plate 6 at the set angle, ensuring that the angle of the squeegee strip 14 is stable and unchanged during printing. The angle of the squeegee strip 14 can be adjusted during printing to meet different printing needs. The installation and disassembly of the squeegee are simple and fast, which is suitable for scenes of frequent replacement and adjustment.

[0032] Please refer to Figure 4 and Figure 5 Further introduce the connecting plate 6, the connecting plate 6 one side is provided with the scraper body 11 and the locking plate 15 in turn, the scraper strip 14 is installed between the scraper body 11 and the locking plate 15, the connecting plate 6 one side is provided with the clamping groove 10, the scraper body 11 is fixed with the clamping block 12 on the side close to the connecting plate 6, and the clamping block 12 is clamped and fixed with the clamping groove 10, the scraper body 11 is installed in the clamping groove 10 of the connecting plate 6 through the clamping block 12, the both sides of the scraper body 11 are provided with the clamping block 12, which can be matched with the clamping groove 10 on the connecting plate 6, to realize quick installation and disassembly, when the scraper needs to be adjusted or replaced, the operator only needs to insert the clamping block 12 of the scraper body 11 into the clamping groove 10, and the clamping structure can stably fix the scraper on the connecting plate 6.

[0033] In order to ensure that the production line will not be shut down due to the replacement of the scraper strip 14, therefore, the scraper body 11 is provided with an auxiliary groove 13 on the side close to the locking plate 15, the scraper strip 14 is clamped in the auxiliary groove 13, and the scraper strip 14 is detachable; the scraper strip 14 is clamped with the scraper body 11 through the auxiliary groove 13, and the scraper strip 14 can be more conveniently replaced and cleaned, when the scraper strip 14 is worn or needs to be replaced, the scraper strip 14 is only taken out, and the new scraper strip 14 can be clamped into the auxiliary groove 13, to ensure the continuity of the production line.

[0034] Considering that the scraper strip 14 contacts the photovoltaic cell substrate in use, which can make the scraper body 11 be lifted upward, therefore, the locking plate 15 and the scraper body 11 are provided with mounting holes, the scraper body 11 is tightly connected with the locking plate 15 through the mounting holes, to ensure that the scraper will not be loose in the working process, when the scraper is installed, the mounting holes of the scraper body 11 are aligned with the mounting holes of the locking plate 15, the operator inserts bolts or other fasteners into the holes, to ensure that the scraper body 11 is firmly fixed on the adjusting connecting plate 6, the locking plate 15 not only provides additional fixing force, but also enhances the connection stability of the scraper and the adjusting connecting plate 6, especially in the high-pressure printing process, the deviation or looseness of the scraper due to vibration or pressure is avoided, in the printing process, the scraper forms a stable whole with the adjusting connecting plate 6 through the locking plate 15, to ensure that the scraper is always in the correct position, to prevent any displacement of the scraper in the printing process, and to maintain the stability of the printing quality.

[0035] The same side end of the squeegee body 11 and the squeegee strip 14 is provided with a groove, and the position and number of the groove correspond to the grid lines on the photovoltaic cell. In the printing preparation stage, the operator adjusts the groove position of the squeegee and the squeegee strip 14 according to the grid line design of the cell, ensures that the groove is accurately aligned with the grid line, and when printing, the conductive paste is printed on the cell through the screen printing, and the groove on the squeegee and the squeegee strip 14 ensures that the paste only passes in the grid line area. The width of the groove is designed to be 1.02 to 1.1 times the width of the grid line, so that the paste can be evenly covered on the grid line, and the excessive paste will not leak to other areas due to the too wide groove. When the squeegee passes through the cell, the groove controls the flow of the paste to form a fine and uniform conductive line in the grid line area. This design ensures the accuracy of the conductive line, reduces the printing error, and improves the electrical performance of the cell.

[0036] The squeegee body 11 and the squeegee strip 14 are made of polyurethane material, and the hardness values of the squeegee body 11 and the squeegee strip 14 are different. The squeegee body 11 is made of high-hardness polyurethane material with a hardness of 80A-90A, and the squeegee strip 14 is made of low-hardness material with a hardness of 60A-70A. The difference in hardness ensures that the overall structure of the squeegee remains stable during printing, and the squeegee strip 14 has moderate softness when it contacts the screen, which can better adapt to the deformation of the screen. During printing, the high-hardness squeegee body 11 provides sufficient support to ensure that it does not deform under high pressure, thereby ensuring the line accuracy during printing. At the same time, the squeegee strip 14 with lower hardness can conform to the surface of the screen when it contacts the screen, uniformly apply pressure, and prevent excessive wear on the screen. The high-hardness squeegee body 11 ensures the durability and stability of the system, while the low-hardness squeegee strip 14 ensures the flexibility and accuracy during printing. The combination of the two ensures that the squeegee can provide strong support and soft contact with the screen surface, ultimately achieving high-quality printing results.

[0037] In summary, the working principle of the present scheme is as follows:

[0038] In use, the operator adjusts the squeegee angle according to the position of the adjusting pointer 7, tightens the locking bolt 9 after adjustment is complete, the connecting plate 6 is fixed at the set angle, the squeegee body 11 is installed in the clamping groove 10 of the connecting plate 6 through the clamping block 12, the squeegee strip 14 is clamped and installed on the squeegee body 11 through the auxiliary groove 13, so that the squeegee strip 14 maintains the same angle as the connecting plate 6, the locking plate 15 is installed on the squeegee body 11 through the bolt, and the squeegee strip 14 is clamped and fastened, the air cylinder 4 is started, the extension end of the air cylinder 4 pushes the positioning plate 3 to slide, the positioning plate 3 moves along the slide rail 2, thereby driving the squeegee strip 14 to print the photovoltaic cell substrate.

[0039] Although the present specification is described in terms of embodiments, not every embodiment exhibits every characteristic or implements every combination of features described in the specification. In addition, the description of the specification is not to be understood as an entire list of features available to the inventor that must be present in every embodiment or combination thereof. Those skilled in the art will readily appreciate that other embodiments of the specification that are not explicitly described herein are possible and contemplated. The description of the specification is merely an aid to understanding various embodiments of the specification and is not intended to limit the scope of the specification in any way.

[0040] The above description is merely illustrative of the embodiments of the present application and is not intended to limit the scope of the application. Variations and modifications as can be obvious to those skilled in the art are intended to be within the scope of the application as defined in the claims.

Claims

1. A squeegee frame for screen printing of photovoltaic cells, comprising a positioning plate (3) slidingly connected to a slide rail (2) at the bottom of a mounting plate (1) and a pneumatic cylinder (4) fixed to one side of the mounting plate (1) and pushing the positioning plate (3) to slide along the slide rail (2), characterized in that: Both ends of the positioning plate (3) are fixed with vertical plates (5), the connecting plate (6) with the scraping strip (14) is rotatably connected between the vertical plates (5), and the connecting plate (6) is provided with an adjusting pointer (7) at one end of the rotating shaft connected with the two vertical plates (5), the locking bolt (9) is mounted on both sides of the connecting plate (6), and each vertical plate (5) is provided with an arc-shaped limiting groove (8) with the rotating shaft as the center, and the locking bolt (9) is slidably connected with the limiting groove (8).

2. The squeegee holder for screen printing of photovoltaic cells according to claim 1, characterized in that: The connecting plate (6) is provided with a scraping plate body (11) and a locking plate (15) in sequence on one side, and the scraping strip (14) is mounted between the scraping plate body (11) and the locking plate (15).

3. A squeegee holder for screen printing of photovoltaic cells according to claim 2, characterized in that: The connecting plate (6) is provided with a clamping groove (10) on one side, the scraping plate body (11) is provided with a clamping block (12) on one side close to the connecting plate (6), and the clamping block (12) is clamped and fixed with the clamping groove (10).

4. The squeegee holder for screen printing of photovoltaic cells of claim 2, wherein: The scraping plate body (11) is provided with an auxiliary groove (13) on one side close to the locking plate (15), the scraping strip (14) is clamped in the auxiliary groove (13), and the scraping strip (14) is detachable.

5. The squeegee holder for screen printing of photovoltaic cells of claim 2, wherein: The locking plate (15) and the scraping plate body (11) are provided with mounting holes, and the locking plate (15) and the scraping plate body (11) are clamped and fixed by inserting the fasteners into the mounting holes.

6. The squeegee holder for screen printing of photovoltaic cells of claim 2, wherein: The scraping plate body (11) and the scraping strip (14) are made of polyurethane material, and the hardness values of the scraping plate body (11) and the scraping strip (14) are different.

7. A squeegee holder for screen printing of photovoltaic cells according to claim 6, characterized in that: The scraping plate body (11) is made of high-hardness material, and the Shore hardness value is between 80A and 90A, and the scraping strip (14) is made of low-hardness material, and the Shore hardness value is between 60A and 70A.

8. The squeegee holder for screen printing of photovoltaic cells of claim 2, wherein: The same side ends of the scraping plate body (11) and the scraping strip (14) are provided with grooves, and the positions and numbers of the grooves correspond to the grid lines on the photovoltaic cell.

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