A string welding machine for processing solar cell sheets

Abstract

The present invention relates to the field of new energy technology, specifically to a string welding machine for processing solar cell sheets, comprising a protective cover; a rotating assembly, the rotating assembly comprising two tracks, and a plurality of fixed rings are fixedly connected to the outer ring surface of the track; a heating assembly, the heating assembly comprising a first infrared lamp tube, a second infrared lamp tube and a third infrared lamp tube, one end of the first infrared lamp tube is fixedly connected to a long connecting pole and the long connecting pole is located near the track. The string welding machine for processing solar cell sheets, through the synchronous rotation of the track and the conveyor belt, enables the heating unit composed of the first infrared lamp tube, the second infrared lamp tube and the third infrared lamp tube on the track to perform synchronous heating and welding following with the photovoltaic cell sheets and the string connecting strips on the conveyor belt, thereby ensuring sufficient heating and welding time while improving the efficiency of string welding, so that the conveyor belt can continuously transmit the photovoltaic cell sheets and the string connecting strips thereon, thereby improving the efficiency of string welding.

Description

Technical Field

[0001] The invention relates to the field of new energy technology, in particular to a string welding machine for processing solar cell sheets. Background Art

[0002] Photovoltaic cells are generally divided into crystalline silicon and amorphous silicon. A whole photovoltaic panel is usually composed of multiple cells, and each cell is electrically connected through a string welding machine. Most of the existing string welding machines use infrared heating lamps for heating and welding.

[0003] When the existing battery cells are being string-welded, the conveyor belt will stop the transmission in stages through a stepper motor or other means. The stop time is generally between one and three seconds, so that the battery cells and the conductive strips used for electrical connection are fully heated and welded, avoiding cold solder joints between the battery cells and the conductive strips. Each stop of the conveyor belt will reduce production efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a string welding machine for processing solar cell sheets, so as to solve the problem that the traditional string welding machine mentioned in the above background technology has reduced production efficiency due to the need to stop the operation of the conveyor belt when heating and welding the cell sheets and the conductive strips. To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a string welding machine for processing solar cell sheets, comprising a protective cover; a rotating assembly, the rotating assembly comprising two tracks, and a plurality of fixing rings are fixedly connected to the outer ring surface of the track; a heating assembly, the heating assembly comprising a first infrared lamp tube, a second infrared lamp tube and a third infrared lamp tube, one end of the first infrared lamp tube is fixedly connected to a long-connected electric pole and the long-connected electric pole is located near the track, and one end of the third infrared lamp tube is fixedly connected to a short-connected electric pole and the short-connected electric pole is located away from the track; a power-on assembly, the power-on assembly comprising a shell, an upper power sheet is fixedly connected to an inner wall of one side of the shell, and a lower power sheet is fixedly connected to an inner wall of the bottom of the shell; a transmission assembly, the transmission assembly comprising a second gear, a side surface of the second gear is connected to a first gear of the same specification as the second gear through meshing transmission, a connecting shaft is fixedly sleeved on the inner wall of the second gear, a second transmission wheel is fixedly sleeved on the side surface of the connecting shaft, a transmission belt is transmission-connected to the side surface of the second transmission wheel, and the inner wall of the other end of the transmission belt is transmission-connected to the first transmission wheel.

[0005] Further preferably, the inner walls at both ends of the track are respectively connected to a rotating shaft in a transmission manner, and a plurality of retaining rings for limiting the track are fixedly sleeved on the side surface of the rotating shaft, and every two retaining rings are respectively located on opposite sides of the track, and every three adjacent fixed rings form a group.

[0006] Further preferably, each adjacent first infrared lamp tube, second infrared lamp tube and third infrared lamp tube form a group of heating units, and the first infrared lamp tube, second infrared lamp tube and third infrared lamp tube of each group of the heating units are electrically connected in series through the first wiring point, the second wiring point and the third wiring point on each of them, and the long-circuit electric pole overlaps with the upper electric sheet and is energized when the track rotates, and the short-circuit electric pole overlaps with the lower electric sheet and is energized when the track rotates, and the length of the short-circuit electric pole is smaller than that of the long-circuit electric pole and the short-circuit electric pole does not contact and interfere with the upper electric sheet when the track rotates.

[0007] Further preferably, one side of the shell is fixedly connected to the side of the protective cover close to the first transmission wheel and the shell is communicated with the protective cover, both ends of the lower electric sheet are inclined and the lower electric sheet is arched as a whole, and one end of the upper electric sheet is inclined.

[0008] Further preferably, one end of one of the rotating shafts passes through one side of the shell and is fixedly connected to one side of the first transmission wheel, one side of the second gear is fixedly connected to an active transmission roller through an axis core, one end of the axis core of the active transmission roller is provided with a motor for driving the active transmission roller to rotate, and the output shaft end of the motor is fixedly connected to the axis core on the active transmission roller.

[0009] Further preferably, the side surface of the active transmission roller is transmission-connected with a transmission belt, and the inner wall of the transmission belt is transmission-connected with a plurality of driven transmission rollers for auxiliary transmission, the two ends of the shaft core on the driven transmission roller are respectively movably connected with brackets through bearings, one end of the connecting shaft is movably connected to one side of one of the brackets through a bearing, the two ends of the shaft core on the active transmission roller respectively pass through the opposite sides of the two brackets and are movably connected to the brackets, the side of the motor close to the active transmission roller is fixedly connected to one side of the other bracket, and the top of one of the brackets is fixedly connected to two connecting frames, and a plurality of fixing holes for fixing the protective cover by bolts are opened inside the connecting frame, and the protective cover is fixedly connected to the connecting frame by bolts.

[0010] Further preferably, a plurality of photovoltaic cells for series welding are provided on the top of the conveyor belt, a series connection bar for series welding adjacent photovoltaic cells is provided on the bottom of the photovoltaic cells and the other end of the series connection bar is overlapped on the top of the adjacent photovoltaic cells, the positive and negative poles of each photovoltaic cell are respectively located on the front and back sides of the photovoltaic cell and the plurality of photovoltaic cells are connected in series through a plurality of series connection bars.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] In the present invention, through the synchronous rotation of the crawler and the conveyor belt, the heating unit composed of the first infrared lamp tube, the second infrared lamp tube and the third infrared lamp tube on the crawler belt and the photovoltaic cells and the series connection strips on the conveyor belt are synchronously heated and welded and followed, thereby ensuring sufficient heating and welding time while improving the efficiency of series welding, so that the conveyor belt can continuously transmit the photovoltaic cells and series connection strips thereon, thereby improving the efficiency of series welding.

[0013] In the present invention, the short-circuit electric pole on the third infrared lamp tube is electrically connected to the lower electric sheet through the rotation of the crawler belt, so that the first infrared lamp tube, the second infrared lamp tube and the third infrared lamp tube connected in series in the heating unit operate synchronously, so that when the photovoltaic cell piece is completely moved to the bottom of the heating unit, the photovoltaic cell piece and the series connection bar are energized, heated and welded, so as to avoid the breakage of the photovoltaic cell piece due to uneven local heating.

[0014] In the present invention, according to production requirements, when the heating time varies due to the different thicknesses of the photovoltaic cells or the different thicknesses of the string bars when photovoltaic cells of different specifications are serially welded, the transmission speed of the crawler and the conveyor belt is changed by replacing a motor with a different rotation speed or adjusting the rotation speed of the motor to ensure that a suitable heating time is reached, so that the heating time is easy to control and adjust, and is suitable for the serial welding of photovoltaic cells of different specifications, thereby improving the versatility of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0016] Figure 2 Schematic diagram of the explosion structure of the present invention Figure 1 ;

[0017] Figure 3 Schematic diagram of the explosion structure of the present invention Figure 2 ;

[0018] Figure 4 It is a schematic diagram of the structures of the first infrared lamp tube, the second infrared lamp tube and the third infrared lamp tube of the present invention;

[0019] Figure 5 The local cross-sectional structure of the present invention is schematically shown Figure 1 ;

[0020] Figure 6 The local cross-sectional structure of the present invention is schematically shown Figure 2 ;

[0021] Figure 7 The local cross-sectional structure of the present invention is schematically shown Figure 3 .

[0022] In the figure: 1, protective cover; 2, rotating assembly; 3, heating assembly; 4, power assembly; 5, transmission assembly; 6, transmission belt; 7, photovoltaic cell; 8, series connection bar; 9, bracket; 10, connecting frame; 11, fixing hole; 201, rotating shaft; 202, crawler; 203, fixing ring; 204, retaining ring; 301, first infrared lamp; 302, second infrared lamp; 303, third infrared lamp; 304, long connection Column; 305, first connection point; 306, second connection point; 307, short-circuit column; 308, third connection point; 401, shell; 402, upper power sheet; 403, lower power sheet; 501, first transmission wheel; 502, transmission belt; 503, second transmission wheel; 504, active transmission roller; 505, motor; 506, driven transmission roller; 507, first gear; 508, second gear; 509, connecting shaft. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-Figure 7 The present invention provides a technical solution: a string welding machine for processing solar cell sheets, comprising a protective cover 1; a rotating assembly 2, the rotating assembly 2 comprising two crawlers 202, and a plurality of fixing rings 203 are fixedly connected to the outer ring surface of the crawler 202; a heating assembly 3, the heating assembly 3 comprising a first infrared lamp tube 301, a second infrared lamp tube 302 and a third infrared lamp tube 303, one end of the first infrared lamp tube 301 is fixedly connected to a long-connected electric pole 304 and the long-connected electric pole 304 is located near the crawler 202, one end of the third infrared lamp tube 303 is fixedly connected to a short-connected electric pole 307 and the short-connected electric pole 307 is located away from the crawler 202; a power supply assembly 4 The power-on component 4 includes a shell 401, an upper power sheet 402 is fixedly connected to the inner wall of one side of the shell 401, and a lower power sheet 403 is fixedly connected to the bottom inner wall of the shell 401; a transmission component 5, the transmission component 5 includes a second gear 508, a side surface of the second gear 508 is connected to a first gear 507 of the same specification as the second gear 508 through meshing transmission, a connecting shaft 509 is fixedly sleeved on the inner wall of the second gear 508, a second transmission wheel 503 is fixedly sleeved on the side surface of the connecting shaft 509, the side surface of the second transmission wheel 503 is transmission-connected to a transmission belt 502, and the inner wall of the other end of the transmission belt 502 is transmission-connected to the first transmission wheel 501.

[0025] In this embodiment, Figure 2 , Figure 4 and Figure 5 As shown, the inner walls at both ends of the crawler 202 are respectively connected to the rotating shaft 201 in a transmission manner, and a plurality of retaining rings 204 for limiting the crawler 202 are fixedly sleeved on the side surface of the rotating shaft 201, and every two retaining rings 204 are respectively located on the opposite sides of the crawler 202, and every three adjacent fixed rings 203 form a group.

[0026] In this embodiment, Figure 4 , Figure 5 and Figure 6 As shown, each adjacent first infrared lamp tube 301, second infrared lamp tube 302 and third infrared lamp tube 303 form a group of heating units, and the first infrared lamp tube 301, second infrared lamp tube 302 and third infrared lamp tube 303 of each group of heating units are electrically connected in series through the first wiring point 305, second wiring point 306 and third wiring point 308 thereon respectively, and the long-circuit electric post 304 overlaps with the upper power sheet 402 and is energized when the track 202 rotates, and the short-circuit electric post 307 overlaps with the lower power sheet 403 and is energized when the track 202 rotates, and the length of the short-circuit electric post 307 is less than the length of the long-circuit electric post 304 and the short-circuit electric post 307 does not contact and interfere with the upper power sheet 402 when the track 202 rotates.

[0027] In this embodiment, Figure 5 , Figure 6 and Figure 7 As shown, one side of the shell 401 is fixedly connected to the side of the protective cover 1 close to the first transmission wheel 501 and the shell 401 is connected to the protective cover 1, the two ends of the lower electric sheet 403 are inclined and the lower electric sheet 403 is arched as a whole, and one end of the upper electric sheet 402 is inclined.

[0028] In this embodiment, Figure 2 , Figure 3 and Figure 5 As shown, one end of a rotating shaft 201 passes through one side of the shell 401 and is fixedly connected to one side of the first transmission wheel 501, one side of the second gear 508 is fixedly connected to the active transmission roller 504 through the shaft core, one end of the shaft core of the active transmission roller 504 is provided with a motor 505 for driving the active transmission roller 504 to rotate, and the output shaft end of the motor 505 is fixedly connected to the shaft core on the active transmission roller 504.

[0029] In this embodiment, Figure 1 and Figure 3As shown, the side surface of the active transmission roller 504 is transmission-connected with a transmission belt 6, and the inner wall of the transmission belt 6 is transmission-connected with a plurality of driven transmission rollers 506 for auxiliary transmission, and the two ends of the shaft core on the driven transmission roller 506 are respectively movably connected with brackets 9 through bearings, and one end of the connecting shaft 509 is movably connected to one side of one of the brackets 9 through a bearing, and the two ends of the shaft core on the active transmission roller 504 respectively pass through the opposite sides of the two brackets 9 and are movably connected to the brackets 9, and the side of the motor 505 close to the active transmission roller 504 is fixedly connected to one side of the other bracket 9, and the top of one of the brackets 9 is fixedly connected to two connecting frames 10, and the interior of the connecting frame 10 is provided with a plurality of fixing holes 11 for fixing the protective cover 1 by bolts, and the protective cover 1 is fixed to the top of the connecting frame 10. The connecting frame 10 is fixedly connected by bolts. When in use, multiple photovoltaic cells 7 are placed on the conveyor belt 6 and the two ends of the series connection strip 8 are placed on the positive and negative electrodes of two adjacent photovoltaic cells 7, so that multiple photovoltaic cells 7 are welded in series during heating. The motor 505 is started by an external controller, so that the output shaft end of the motor 505 drives the active conveyor roller 504 to rotate through the shaft core fixedly sleeved in the active conveyor roller 504, so that the photovoltaic cells 7 and the series connection strip 8 on the conveyor belt 6 move from the conveyor roller 506 to the active conveyor roller 504. While the active conveyor roller 504 rotates, the second gear 508 is driven to rotate through the shaft core inside it and changes direction with the same speed ratio through the meshing first gear 507 of the same specifications. The crawler 202 is then driven synchronously by the second transmission wheel 503, the transmission belt 502, the first transmission wheel 501 and the rotating shaft 201 to transmit, so that each heating unit composed of the first infrared lamp tube 301, the second infrared lamp tube 302 and the third infrared lamp tube 303 synchronously follows the corresponding photovoltaic cell 7 on the transmission belt 6. When the crawler 202 rotates, the long-circuited electric pole 304 on the first infrared lamp tube 301 first contacts the top of the upper electric plate 402 to achieve electrical connection. As the crawler 202 continues to rotate, the short-circuited electric pole 307 on the third infrared lamp tube 303 contacts the lower electric plate 403. At this time, the circuit is closed, so that the first infrared lamp tube 301, the second infrared lamp tube 302 and the third infrared lamp tube 303 connected in series are energized and generate heat at the same time. The corresponding photovoltaic cell piece 7 and the serial connection strip 8 at the bottom are subjected to high-temperature welding, and the conveyor belt 6 and the crawler belt 202 rotate synchronously, so that each group of the first infrared lamp tube 301, the second infrared lamp tube 302 and the third infrared lamp tube 303 are heated and followed while the photovoltaic cell piece 7 and the serial connection strip 8 are transmitted, ensuring sufficient welding time, until the long connecting pole 304 on the first infrared lamp tube 301 is separated from the upper power piece 402 under the rotation of the crawler belt 202, at which time the first infrared lamp tube 301, the second infrared lamp tube 302 and the third infrared lamp tube 303 connected in series are powered off and no longer heated, and at this time the group of heating units has also completed the welding of the photovoltaic cell piece 7 and the serial connection strip 8 at the corresponding position, and the subsequent photovoltaic cell piece 7 is heated and serially welded in the above manner,The interval between each two adjacent photovoltaic cells 7 is the interval between each group of heating units.

[0030] In this embodiment, Figure 1 and Figure 3 As shown, a plurality of photovoltaic cells 7 for serial welding are provided on the top of the conveyor belt 6, a serial connection bar 8 for serial welding adjacent photovoltaic cells 7 is provided on the bottom of the photovoltaic cells 7, and the other end of the serial connection bar 8 is overlapped on the top of the adjacent photovoltaic cells 7, the positive and negative poles of each photovoltaic cell 7 are respectively located on the front and back sides of the photovoltaic cell 7, and the plurality of photovoltaic cells 7 are connected in series through a plurality of serial connection bars 8.

[0031] The use method and advantages of the present invention: When the string welding machine for processing solar cell sheets is used, the working process is as follows:

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, when in use, multiple photovoltaic cells 7 are placed on the conveyor belt 6 and the two ends of the series connection strip 8 are placed on the positive and negative electrodes of two adjacent photovoltaic cells 7, so that the multiple photovoltaic cells 7 are welded in series during heating, and the motor 505 is started by an external controller so that the output shaft end of the motor 505 drives the active conveyor roller 504 to rotate through the shaft core fixedly sleeved in the active conveyor roller 504, so that the photovoltaic cells 7 and the series connection strip 8 on the conveyor belt 6 move from the conveyor roller 506 to the active conveyor roller 504. While the active conveyor roller 504 rotates The shaft core inside the second gear 508 is driven to rotate and the first gear 507 with the same specifications and meshing is changed to the same speed ratio, and then the crawler 202 is synchronously driven to transmit through the second transmission wheel 503, the transmission belt 502, the first transmission wheel 501 and the rotating shaft 201, so that each heating unit composed of the first infrared lamp tube 301, the second infrared lamp tube 302 and the third infrared lamp tube 303 synchronously follows the corresponding photovoltaic cell 7 on the conveyor belt 6. When the crawler 202 rotates, the long connecting pole 304 on the first infrared lamp tube 301 is connected to the upper power pole 304. The top of the sheet 402 is electrically connected. As the crawler 202 continues to rotate, the short-circuit electric pole 307 on the third infrared lamp tube 303 contacts the lower electric sheet 403. At this time, the circuit is closed, so that the first infrared lamp tube 301, the second infrared lamp tube 302 and the third infrared lamp tube 303 connected in series are energized and heated at the same time, so that the corresponding photovoltaic cell sheet 7 and the series connection bar 8 located below are subjected to high-temperature welding, and the conveyor belt 6 and the crawler 202 rotate synchronously, so that each group of the first infrared lamp tube 301, the second infrared lamp tube 302 and the third infrared lamp tube 303 are on the photovoltaic cell sheet 7. Heating and following are performed while transmitting with the series connection bar 8 to ensure sufficient welding time, until the long connecting pole 304 on the first infrared lamp tube 301 is separated from the upper power sheet 402 under the rotation of the crawler 202, at which time the first infrared lamp tube 301, the second infrared lamp tube 302 and the third infrared lamp tube 303 connected in series are powered off and no longer heated, and at this time the group of heating units has also completed the welding of the photovoltaic cells 7 and the series connection bar 8 at the corresponding positions, and the subsequent photovoltaic cells 7 are heated and series-welded in the above manner, and the interval between each two adjacent photovoltaic cells 7 is the interval of each group of heating units.

[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A string welding machine for processing solar cell sheets, characterized in that: including a protective cover (1); A rotating assembly (2), the rotating assembly (2) comprising two crawlers (202), a plurality of fixing rings (203) being fixedly connected to the outer annular surfaces of the crawlers (202); A heating component (3), the heating component (3) comprising a first infrared lamp tube (301), a second infrared lamp tube (302) and a third infrared lamp tube (303), one end of the first infrared lamp tube (301) being fixedly connected to a long-circuit electric pole (304) and the long-circuit electric pole (304) being located close to the crawler track (202), and one end of the third infrared lamp tube (303) being fixedly connected to a short-circuit electric pole (307) and the short-circuit electric pole (307) being located far from the crawler track (202); A power-on component (4), the power-on component (4) comprising a shell (401), an upper power sheet (402) being fixedly connected to an inner wall of one side of the shell (401), and a lower power sheet (403) being fixedly connected to an inner wall of a bottom of the shell (401); A transmission assembly (5), the transmission assembly (5) comprising a second gear (508), the side surface of the second gear (508) being connected to a first gear (507) of the same specification as the second gear (508) through meshing transmission, a connecting shaft (509) being fixedly sleeved on the inner wall of the second gear (508), a second transmission wheel (503) being fixedly sleeved on the side surface of the connecting shaft (509), a transmission belt (502) being transmission-connected to the side surface of the second transmission wheel (503), the inner wall of the other end of the transmission belt (502) being transmission-connected to the first transmission wheel (501), each adjacent first infrared lamp tube (301), second infrared lamp tube (302) and third infrared lamp tube (301) being transmission-connected to the inner wall of the second transmission wheel (503), and the first infrared lamp tube (301) being transmission-connected to the inner wall of the other end of the transmission belt (502). 3) is a group of heating units, wherein the first infrared lamp tube (301), the second infrared lamp tube (302) and the third infrared lamp tube (303) of each group of heating units are electrically connected in series through the first wiring point (305), the second wiring point (306) and the third wiring point (308) on each of them, the long-circuit electric post (304) overlaps with the upper power sheet (402) and is energized when the crawler (202) rotates, the short-circuit electric post (307) overlaps with the lower power sheet (403) and is energized when the crawler (202) rotates, the length of the short-circuit electric post (307) is less than the length of the long-circuit electric post (304), and the short-circuit electric post (307) does not contact or interfere with the upper power sheet (402) when the crawler (202) rotates.

2. A string welding machine for processing solar cells according to claim 1, characterized in that: The inner walls at both ends of the crawler (202) are respectively connected to the rotating shaft (201) in a transmission manner, and a plurality of retaining rings (204) for limiting the crawler (202) are fixedly sleeved on the side surface of the rotating shaft (201), and each two retaining rings (204) are respectively located on two opposite sides of the crawler (202), and each three adjacent fixing rings (203) form a group.

3. The solar cell processing string welding machine according to claim 1, characterized in that: One side of the shell (401) is fixedly connected to a side of the protective cover (1) close to the first transmission wheel (501), and the shell (401) is in communication with the protective cover (1); both ends of the lower electric sheet (403) are inclined and the lower electric sheet (403) is arched as a whole; and one end of the upper electric sheet (402) is inclined.

4. A string welding machine for processing solar cells according to claim 2, characterized in that: One end of one of the rotating shafts (201) passes through one side of the housing (401) and is fixedly connected to one side of the first transmission wheel (501); one side of the second gear (508) is fixedly connected to an active transmission roller (504) via an axis core; one end of the axis core of the active transmission roller (504) is provided with a motor (505) for driving the active transmission roller (504) to rotate, and the output shaft end of the motor (505) is fixedly connected to the axis core on the active transmission roller (504).

5. A string welding machine for processing solar cell sheets according to claim 4, characterized in that: The side surface of the active transmission roller (504) is transmission-connected to a transmission belt (6), and the inner wall of the transmission belt (6) is transmission-connected to a plurality of driven transmission rollers (506) for auxiliary transmission, and the two ends of the shaft core on the driven transmission roller (506) are respectively movably connected to brackets (9) via bearings, and one end of the connecting shaft (509) is movably connected to one side of one of the brackets (9) via a bearing, and the two ends of the shaft core on the active transmission roller (504) respectively pass through the opposite sides of the two brackets (9) and are movably connected to the brackets (9), and the side of the motor (505) close to the active transmission roller (504) is fixedly connected to one side of the other bracket (9), and the top of one of the brackets (9) is fixedly connected to two connecting frames (10), and the interior of the connecting frame (10) is provided with a plurality of fixing holes (11) for fixing the protective cover (1) via bolts, and the protective cover (1) is fixedly connected to the connecting frame (10) via bolts.

6. A string welding machine for processing solar cell sheets according to claim 5, characterized in that: A plurality of photovoltaic cells (7) for serial welding are arranged on the top of the conveyor belt (6), a serial connection bar (8) for serial welding adjacent photovoltaic cells (7) is arranged on the bottom of the photovoltaic cells (7), and the other end of the serial connection bar (8) is overlapped on the top of the adjacent photovoltaic cells (7), the positive and negative electrodes of each photovoltaic cell (7) are respectively located on the front and back surfaces of the photovoltaic cell (7), and the plurality of photovoltaic cells (7) are serially connected via the plurality of serial connection bars (8).

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