A rotary disc photovoltaic cell screen printing apparatus

Abstract

The application discloses a rotary table type photovoltaic cell screen printing equipment, which comprises a base, a working rotary table, a feeding conveying device, a detecting device, first and second screen printing heads and a discharging conveying device. The base comprises a pair of parallel supporting plates and a base top plate fixed on the top of the pair of supporting plates; the working rotary table is circular and rotatably installed on the top surface center of the base top plate, and five printing tables are radially and evenly arranged on the working rotary table; feeding stations, first and second printing stations, discharging stations and maintenance stations are evenly arranged on the top surface of the base top plate along the periphery of the working rotary table; the feeding conveying device and the detecting device are correspondingly installed on the base top plate; the first and second screen printing heads are correspondingly installed on the base top plate in one-to-one correspondence with the first and second printing stations; and the discharging conveying device is correspondingly installed on the base top plate and corresponds to the discharging stations. The application realizes high-precision, high-speed and high-stability screen printing of photovoltaic cells.

Description

TECHNICAL FIELD

[0001] The present application relates to a printing machine, in particular to a rotary disc type photovoltaic cell screen printing device. BACKGROUND

[0002] Screen printing (printing conductive silver paste on silicon wafers) is the most important step in the preparation of solar panels, which directly determines the power generation efficiency of solar panels. With the development of science and technology, the power generation of solar panels is continuously improved, and the requirements for the preparation equipment of the solar panels, especially the screen printing part, are also increasing.

[0003] The current photovoltaic cell screen printing device on the market has a linear interactive structure, a track type structure and the like. The precision, speed and stability of these screen printing devices sometimes cannot meet the printing requirements of photovoltaic cell silicon wafers. SUMMARY

[0004] The purpose of the present application is to overcome the defects of the prior art and provide a rotary disc type photovoltaic cell screen printing device, which realizes high-precision, high-speed and high-stability screen printing of silicon cell wafers.

[0005] The purpose of the present application is achieved by a rotary disc type photovoltaic cell screen printing device, comprising a base, a working rotary disc, a feeding conveying device, a detection device, a first screen printing head, a second screen printing head and a discharging conveying device; wherein,

[0006] The base comprises a pair of parallel support plates and a base top plate fixed on the top of the pair of support plates;

[0007] The working rotary disc is circular and rotatably installed on the top surface of the center of the base top plate, and five rectangular rotary disc grooves are evenly radially arranged on the outer circumferential surface of the working rotary disc, and a printing table is arranged in each rotary disc groove;

[0008] A feeding station, a first printing station, a second printing station, a discharging station and a maintenance station are evenly arranged on the top surface of the base top plate along the outer periphery of the working rotary disc;

[0009] The feeding conveying device and the detection device are installed on the base top plate corresponding to the feeding station; the first screen printing head and the second screen printing head are installed on the base top plate corresponding to the first printing station and the second printing station; and the discharging conveying device is installed on the base top plate corresponding to the discharging station;

[0010] The feeding conveying device feeds two silicon wafer battery pieces to a printing station on the working turntable every certain time interval. The detecting device detects the position of the two silicon wafer battery pieces on the printing station in the feeding position, and feeds the position deviation data of the two silicon wafer battery pieces on the printing station to the controller of the printing device for adjustment of the first and second screen printing heads. The working turntable rotates by 72° to transfer the printing station receiving the two silicon wafer battery pieces to the first printing position, and the first screen printing head prints a pattern on one silicon wafer battery piece. The working turntable rotates by another 72° to transfer the printing station receiving the two silicon wafer battery pieces to the second printing position, and the second screen printing head prints a pattern on the other silicon wafer battery piece. The working turntable rotates by another 72° to transfer the printing station receiving the two silicon wafer battery pieces to the discharging position, and the discharging conveying device discharges the two silicon wafer battery pieces with the printed patterns from the printing device.

[0011] The disc type photovoltaic cell screen printing device has the features that the working turntable is a direct drive motor rotary workbench installed on the top surface of the top plate of the base.

[0012] The disc type photovoltaic cell screen printing device has the features that each printing station includes two paper roll shafts bridged between the two side walls of the turntable groove, three paper passing rollers bridged on the inner end upper portion, outer end upper portion and outer end lower portion of the groove in one-to-one correspondence, two printing station motors rotatably connected with one end of the two paper roll shafts in one-to-one correspondence, and a printing station paper belt wrapped around the two paper roll shafts and the three paper passing rollers.

[0013] The disc type photovoltaic cell screen printing device has the features that a plurality of air holes are uniformly arranged on the printing station paper belt, and a vacuum suction nozzle is arranged.

[0014] The disc type photovoltaic cell screen printing device has the features that the feeding conveying device includes a feeding base plate installed on the top surface of the top plate of the base and driven by a DD direct drive motor, a conveying belt driving motor installed on the feeding base plate, a conveying device support fixed on the feeding base plate and having two pairs of supporting rods, a driving linear belt rotating shaft installed on the inner ends of the two pairs of supporting rods and connected with the conveying belt driving motor through a belt transmission mechanism, two pairs of driving linear belt pulleys installed on the driving linear belt rotating shaft in an interval, two pairs of passive linear belt pulleys each installed on the outer ends of the two pairs of supporting rods in one-to-one correspondence through tensioning sliding blocks, and two pairs of conveying linear belts each wrapped around the two pairs of driving linear belt pulleys and the two pairs of passive linear belt pulleys in one-to-one correspondence.

[0015] The discharging conveying device has the same structure as the feeding conveying device.

[0016] The rotary disc type photovoltaic cell screen printing device, wherein the detection device comprises a first support, a second support, two adjusting rods, a contour positioning camera and two pairs of corner positioning cameras; the first support is in a door shape and is fixed on the top surface of the top plate of the base; the second support comprises a crosspiece plate bridging between the inner end surfaces of the middle portions of the two vertical plates of the first support and a horizontal frame in the shape of Chinese character Wang fixed on the inner end surfaces of the middle portions of the crosspiece plate, three wing rods of the horizontal frame each having a lateral sliding groove opened along the length direction; the two adjusting rods each have a longitudinal sliding groove opened along the length direction and are each correspondingly installed in the lateral sliding grooves of the three wing rods on the two sides of the web of the horizontal frame through three horizontal frame sliding blocks; and the contour positioning camera is fixed on the top surface of the web of the horizontal frame.

[0017] The rotary disc type photovoltaic cell screen printing device, wherein the first screen printing head comprises an up-down adjusting mechanism, a front-rear adjusting mechanism, a left-right adjusting mechanism, an angle adjusting mechanism and a printing mechanism;

[0018] The up-down adjusting mechanism comprises four guide sleeves correspondingly inserted into four through holes opened on the top plate of the base, four lead screws correspondingly inserted into the four guide sleeves, four lead screw nuts correspondingly installed on the four lead screws, four lifting rods correspondingly connected to the four lead screw nuts and a first driving mechanism installed below the base top plate, the first driving mechanism comprising a mechanism bottom plate sleeved on the lower ends of the four guide sleeves, a driving motor installed on the middle portion of the mechanism bottom plate, a motor pulley installed on the rotating shaft of the driving motor, four lead screw pulleys correspondingly installed on the lower ends of the four lead screws and a transmission belt wound around the motor pulley and the four lead screw pulleys;

[0019] The front-rear adjusting mechanism comprises a lower base plate installed on the top surfaces of the four lifting rods of the up-down adjusting mechanism, two front-rear guide rails installed on the top surface of the lower base plate and a front-rear linear motor installed on the top surface of the lower base plate and located between the two front-rear guide rails;

[0020] The left-right adjusting mechanism comprises a middle base plate installed on the two front-rear guide rails of the front-rear adjusting mechanism and driven by the front-rear linear motor, two left-right guide rails installed on the top surface of the middle base plate and a left-right linear motor installed on the top surface of the middle base plate and located between the two left-right guide rails;

[0021] The angle adjusting mechanism comprises an upper base plate, a base frame plate, four guide wheels, a screen frame and a second driving mechanism; the upper base plate is installed on two left-right guide rails of the left-right adjusting mechanism and is driven by left-right linear motors; the base frame plate is rectangular and is connected to the front end of the upper base plate; the four guide wheels are correspondingly installed at the four corners of the top surface of the base frame plate; the screen frame is installed on the top surface of the base frame plate, and the four corners of the screen frame are provided with chamfered guide rails which are correspondingly connected to the four guide wheels on the base frame plate; the second driving mechanism comprises angle adjusting guide rails installed on the rear end of the base frame plate and in the left-right direction, angle adjusting linear motors installed on the base frame plate and a driving wheel installed on the angle adjusting guide rails through a guide wheel support and embedded in an arc-shaped groove on the rear end surface of the middle part of the screen frame and driven by the angle adjusting linear motors.

[0022] The printing mechanism is installed on the base frame plate of the angle adjusting mechanism.

[0023] The structure of the second screen printing head is the same as that of the first screen printing head.

[0024] The above-mentioned rotary disc type photovoltaic cell screen printing device, wherein the printing device further comprises a feeding conveying device connected to the outer end of the feeding conveying device and a discharging conveying device connected to the outer end of the discharging conveying device; the structure of the discharging conveying device is the same as that of the feeding conveying device.

[0025] The rotary disc type photovoltaic cell screen printing device of the present application has the following features: the conveying form of the five-station work disc is adopted, and the detection device and two adjustable screen printing heads are matched, which makes breakthroughs in precision and stability, effectively improves the screen printing quality of the silicon crystal cell and improves the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a perspective view of the rotary disc type photovoltaic cell screen printing device of the present application;

[0027] Figure 2 is a perspective view (top view) of the work disc in the screen printing device of the present application;

[0028] Figure 2a is a perspective view (bottom view) of the work disc in the printing device of the present application;

[0029] Figure 2b is a bottom view of the work disc in the printing device of the present application;

[0030] Figure 2c is Figure 2b A-A view in

[0031] Figure 3 is a perspective view of the feeding conveying device in the printing device of the present application;

[0032] Figure 4 is a perspective view of the detecting device in the printing device of the present application;

[0033] Figure 5 is a perspective view (top view) of the first screen printing head in the printing device of the present application;

[0034] Figure 6 is a perspective view (bottom view) of the first screen printing head in the printing device of the present application;

[0035] Figure 7 is a structural schematic view of the up-down adjusting mechanism in the first screen printing head of the present application;

[0036] Figure 8 is a structural schematic view of the front-rear adjusting mechanism in the first screen printing head of the present application;

[0037] Figure 9 is a structural schematic view of the left-right adjusting mechanism in the first screen printing head of the present application;

[0038] Figures 10 to 16 is a working flow chart of the rotary disc type photovoltaic cell screen printing device of the present application. DETAILED DESCRIPTION

[0039] The present application will be further described below in conjunction with the accompanying drawings.

[0040] Firstly, referring to Figures 1 to 9 the rotary disc type photovoltaic cell screen printing device of the present application comprises a base 1, a working rotary disc 2, a feeding conveying device 8, a feeding conveying device 3, a detecting device 4, a first screen printing head 5, a second screen printing head 6, a discharging conveying device 7 and a discharging conveying device 9.

[0041] The base 1 comprises a pair of parallel support plates 1A and a base top plate 1B fixed on the top of the pair of support plates 1A.

[0042] The working rotary disc 2 is circular and rotatably installed on the top surface center of the base top plate 1B, and the working rotary disc 2 is a DD direct drive motor driven rotary table; five rectangular rotary disc grooves are evenly radially formed on the outer circumferential surface of the working rotary disc 2, and a printing table 20 is arranged in each rotary disc groove;

[0043] Each printing station 20 comprises a pair of printing station support plates 21, two paper roll shafts 22, three paper passing rollers 24 and a printing station paper belt 25; wherein the pair of printing station support plates 21 are fixed on the two side walls of the rotating disc groove correspondingly; the two paper roll shafts 22 are bridged between the pair of printing station support plates 21 from inside to outside, and the head of each paper roll shaft 22 is connected with a printing station motor 23; the three paper passing rollers 24 are bridged on the inner upper part, the outer upper part and the outer lower part of the pair of printing station support plates 21 correspondingly; the printing station paper belt 25 is wound around the two paper roll shafts 22 and the three paper passing rollers 24, and is driven by the two printing station motors 23 correspondingly to move, and the head of each paper roll shaft 22 is respectively provided with a manual dial 26 to facilitate the adjustment and pre-tensioning of the printing station paper belt 25. The printing station paper belt 25 is provided with a plurality of air holes and a vacuum nozzle 27.

[0044] The feeding station, the first printing station, the second printing station, the discharging station and the maintenance station are evenly arranged on the top surface of the base top plate IB along the outer periphery of the working rotating disc 2.

[0045] The feeding conveying device 3 and the detection device 4 are installed on the base top plate IB corresponding to the feeding station; the first screen printing head 5 and the second screen printing head 6 are installed on the base top plate IB corresponding to the first printing station and the second printing station; and the discharging conveying device 7 is installed on the base top plate IB corresponding to the discharging station.

[0046] The feeding conveying device 3 comprises a rotary feeding base plate 30 fixed on the top surface of the base top plate IB and driven by a DD direct drive motor, a conveying belt driving motor 31 installed on the feeding base plate 30, a conveying device support 35 fixed on the feeding base plate 30 and having two pairs of supporting rods 350, a driving linear belt rotating shaft 33 installed on the inner ends of the two pairs of supporting rods 350 and connected with the conveying belt driving motor 31 through a belt transmission mechanism 32, two pairs of driving linear belt pulleys 34 installed on the driving linear belt rotating shaft 33 at intervals, two pairs of passive linear belt pulleys 37 each installed on the outer end of the two pairs of supporting rods 350 through a tensioning sliding block 36 correspondingly, and two pairs of conveying linear belts 38 each wound between the two pairs of driving linear belt pulleys 34 and the two pairs of passive linear belt pulleys 37 correspondingly. The conveying belt driving motor 31 drives the driving linear belt rotating shaft 33 to rotate through the belt transmission mechanism 32, and the driving linear belt pulley 34 is fixed on the driving linear belt rotating shaft 33, thereby driving the conveying linear belt 38 to move, so that the silicon wafer 10 on the conveying linear belt 3 is conveyed; the tensioning sliding block 36 on the outer end of the supporting rod 350 can adjust the tension of the conveying linear belt 38, and the feeding conveying device 3 is driven by the DD direct drive motor and can rotate as a whole.

[0047] The structure of the discharging conveying device 7 is the same as that of the feeding conveying device 3.

[0048] The detecting device 4 comprises a first support 41, a second support, two adjusting rods 43, a contour positioning camera 44 and two pairs of corner positioning cameras 45; the first support 41 is in the shape of a door and is fixed on the top surface of the top plate 1B of the base; the second support comprises a crosspiece 420 bridging between the inner end surfaces of the middle portions of the two vertical plates of the first support 41 and a horizontal frame 422 in the shape of a Chinese character Wang fixed on the inner end surface of the middle portion of the crosspiece 421, three wing rods of the horizontal frame 422 each have a lateral sliding groove 420 opened along the length direction; two ends and the middle portion of the two adjusting rods 43 each have a horizontal frame sliding block connected thereon, so that the two adjusting rods 43 are each installed in the lateral sliding grooves 420 of the three wing rods on the two sides of the web of the horizontal frame 422 through the three horizontal frame sliding blocks one by one in a one-to-one correspondence, the two adjusting rods 43 each have a longitudinal sliding groove 430 opened along the length direction; the contour positioning camera 44 is fixed on the top surface of the web of the horizontal frame 422 of the second support 42; the corner positioning cameras 45 are installed on a camera base 450, and the camera base 450 has an adjusting rod sliding block 46 in the shape of an inverted L connected thereon, so that the two pairs of corner positioning cameras 45 are each hung in the longitudinal sliding grooves 430 of the two adjusting rods 43 through the adjusting rod sliding block 46 in a one-to-one correspondence. The two pairs of corner positioning cameras 45 are adjusted in lateral spacing in the lateral sliding grooves 420 of the horizontal frame 422 through the three horizontal frame sliding blocks on the two adjusting rods 43, and the three horizontal frame sliding blocks on the two adjusting rods 43 are fixed after adjustment; the two pairs of corner positioning cameras 45 are each adjusted in longitudinal spacing in the longitudinal sliding grooves 430 of the two adjusting rods 43 through the adjusting rod sliding block 46, and the adjusting rod sliding blocks 46 of the two pairs of corner positioning cameras 45 are fixed after adjustment.

[0049] The first screen printing head 5 comprises up-down adjusting mechanism 51, front-rear adjusting mechanism 52, left-right adjusting mechanism 53, angle adjusting mechanism and printing mechanism 50; wherein,

[0050] The up-and-down adjusting mechanism 51 comprises four guide sleeves 510 which are respectively inserted into four through holes formed in the top plate 1B of the base, four lead screws 512 which are respectively inserted into the four guide sleeves 510, four lead screw nuts 512 which are respectively mounted on the four lead screws 511, four lifting rods 513 which are respectively connected to the four lead screw nuts 512, and a first driving mechanism which is mounted below the top plate 1B of the base and comprises a mechanism base plate 514 which is sleeved on the lower ends of the four guide sleeves 510, a driving motor 515 which is mounted on the middle part of the mechanism base plate 514, a motor pulley 516 which is mounted on the rotating shaft of the driving motor 515, four lead screw pulleys 517 which are respectively mounted on the lower ends of the four lead screws 512, and a transmission belt 518 which is wound around the motor pulley 516 and the four lead screw pulleys 517; the motor pulley 516 is rotated by the driving motor 515, and then the four lead screw pulleys 517 are driven to rotate by the transmission belt 518, so that the four lead screws 512 are rotated, and finally the four lifting rods 513 are driven to lift and lower;

[0051] The front-and-back adjusting mechanism 52 comprises a lower base plate 521 which is mounted on the top surface of the four lifting rods 513 of the up-and-down adjusting mechanism, two front-and-back guide rails 522 which are mounted on the top surface of the lower base plate 521, and a front-and-back linear motor 523 which is mounted on the top surface of the lower base plate 521 and located between the two front-and-back guide rails 522;

[0052] The left-and-right adjusting mechanism 53 comprises a middle base plate 531 which is mounted on the two front-and-back guide rails 522 of the front-and-back adjusting mechanism 51 and is driven by the front-and-back linear motor 523, two left-and-right guide rails 532 which are mounted on the top surface of the middle base plate 531, and a left-and-right linear motor 533 which is mounted on the top surface of the middle base plate 531 and located between the two left-and-right guide rails 532;

[0053] The angle adjusting mechanism comprises an upper base plate 541, a base frame plate 542, four guide wheels 543, a screen frame 545, and a second driving mechanism; wherein,

[0054] The upper substrate 541 is mounted on the two left-right guide rails 532 of the left-right adjusting mechanism 52 and is driven by the left-right linear motor 533; the base frame plate 542 is rectangular and is connected to the front end of the upper substrate 541; the four guide wheels 543 are correspondingly mounted on the four corners of the top surface of the base frame plate 542; the screen frame 545 is mounted on the top surface of the base frame plate 542, and the four corners of the screen frame 545 are provided with the chamfered guide rails 544 which are correspondingly connected with the four guide wheels 543 on the base frame plate 542; the second driving mechanism includes the angle adjusting guide rail 546 which is mounted on the middle part of the rear end of the base frame plate 542 and is in the left-right direction, the angle adjusting linear motor 547 which is mounted on the base frame plate 542, and the dial wheel 548 which is mounted on the angle adjusting guide rail 546 through the guide wheel support, is embedded in the circular arc-shaped groove which is provided on the middle rear end surface of the screen frame 545, and is driven by the angle adjusting linear motor 547; the dial wheel 548 is driven by the angle adjusting linear motor 547 to move along the angle adjusting guide rail 546, and drives the rear end of the screen frame 545 to move left and right, and since the chamfered guide rails 544 of the four corners of the screen frame 545 are limited by the corresponding guide wheels 543, the screen frame 545 can only rotate at a small angle, thereby realizing the angle adjustment of the screen frame 545.

[0055] The printing mechanism 50 is mounted on the base frame plate 542 of the angle adjusting mechanism, and the printing mechanism 50 includes the squeegee.

[0056] The first screen printing head 5 is used for screen printing silver paste on a silicon wafer 10, and can be adjusted in front, back, left, right, up, down and angle. Before printing, the position deviation data of the silicon wafer 10 obtained by the detection device 4 is quickly adjusted to be flush with the position of the silicon wafer 10 on the printing table 20, and then printing is performed.

[0057] The structure of the second screen printing head 6 is the same as that of the first screen printing head 5, and the second screen printing head 6 is flush with the position of another silicon wafer 10 on the printing table 20, and then printing is performed.

[0058] The feeding conveying device 8 includes an input conveyor belt driving motor 81 mounted on the base top plate 1B, an inner support 82 fixed on the base top plate 1B, an input driving line belt rotating shaft 84 mounted on the inner end of the inner support 82 and connected with the input conveyor belt driving motor 81 through a belt transmission mechanism 83, two pairs of input driving line pulleys 85 which are spaced apart and mounted on the input driving line belt rotating shaft 84, an outer support (not shown in the figure) fixed on the outer field, two pairs of input driven line pulleys 87 each mounted on the outer support through a tensioning sliding block 86, and two pairs of input line belts 88 which are correspondingly wound between the two pairs of input driving line pulleys 85 and the two pairs of input driven line pulleys 87.

[0059] The structure of the outfeed conveyor 9 is the same as that of the infeed conveyor 8.

[0060] Please also refer to Figures 10 to 16 , the screen printing device for the rotary photovoltaic cell of the present application works according to the following flow:

[0061] 1. The infeed conveyor 8 transports two silicon wafer cells 10 to the infeed conveyor 3 every certain time interval (every beat) (see Figure 10 );

[0062] 2. At every beat, the infeed conveyor 3 rotates to a position in alignment with a printing station 20 on the working rotary disc 2, then transports two silicon wafer cells 10 to the printing station 20, and then rotates back to a position in alignment with the infeed conveyor (see Figure 11 );

[0063] 3. After the printing station 20 on the working rotary disc 2 receives the two silicon wafer cells 10, it opens the vacuum negative pressure to adsorb the two silicon wafer cells 20, so as to prevent the two silicon wafer cells 20 from being displaced when the working rotary disc 2 rotates;

[0064] 4. The profile positioning camera 44 and the two pairs of corner positioning cameras 45 in the detection device 4 at the infeed station take pictures of the two silicon wafer cells 10 transported to the printing station 20, and transmit the deviation data of the two silicon wafer cells 10 on the printing station 20 to the controller of the printing device (see Figure 12 );

[0065] 5. The working rotary disc 2 rotates by 72° to transfer the printing station 20 receiving the two silicon wafer cells 10 to the first printing station, and the controller of the printing device adjusts the first screen printing head 5 to a position in alignment with the silicon wafer cell 10 on the right side of the printing station 20 according to the deviation data of the two silicon wafer cells 10 obtained by the detection device 4, and then prints a pattern on the silicon wafer cell 10 (see Figure 13 ); Then the working rotary disc 2 rotates by 72° to transfer the printing station 20 receiving the two silicon wafer cells 10 to the second printing station, and the controller of the printing device adjusts the second screen printing head 6 to a position in alignment with the silicon wafer cell 10 on the left side of the printing station 20 according to the deviation data of the two silicon wafer cells 10 obtained by the detection device 4, and then prints a pattern on the silicon wafer cell 10 (see Figure 14 );

[0066] 6. The working rotary disc 2 rotates by 72° again to transfer the printing station 20 receiving the two silicon wafer cells 10 to the outfeed station; at every beat, the outfeed conveyor 7 rotates to a position in alignment with the printing station 20 at the outfeed station (see Figure 15), the two printed silicon wafer cells 10 on the printing table 20 are transported to the outfeed corner conveyor 7, the outfeed conveyor 7 is turned back to the position in alignment with the outfeed conveyor 9 (see Figure 16 ), and the two silicon wafer cells 10 on the outfeed conveyor 7 are transported to the outfeed conveyor 9, and finally the silicon wafer cells 10 are sent out of the field by the outfeed conveyor 9.

[0067] The rotary table type photovoltaic cell screen printing device of the present application has the following features: it can be used for printing two silicon wafer cells 10 (the size is 210mm x 105mm, 182mm x 105mm, 182mm x 91mm), and it can also be used for printing a whole silicon wafer cell 10 (the size is 210mm x 210mm, 182mm x 210mm, 182mm x 182mm). When printing a whole silicon wafer cell 10, the right half of the whole silicon wafer cell 10 is printed by the first screen printing head 5, and the left half of the whole silicon wafer cell 10 is printed by the second screen printing head 6, or the whole silicon wafer cell 10 can be printed by the first screen printing head 5. In this case, the planar geometric dimensions of the base frame plate 542, the screen frame 545 on the first screen printing head 5 and the printing mechanism 50 are adjusted to be suitable for the planar geometric dimensions of the whole silicon wafer cell 10.

[0068] The above embodiments are only for illustrating the present application, and are not intended to limit the present application. Those skilled in the art can make various transformations or modifications without departing from the spirit and scope of the present application. Therefore, all equivalent technical solutions should belong to the scope of the present application, which is defined by the claims.

Claims

1. A rotary disc type photovoltaic cell screen printing device comprising a base, characterized in that, the device further comprises a working disc, a feeding conveying device, a detecting device, a first screen printing head, a second screen printing head and a discharging conveying device; the base comprises a pair of parallel support plates and a base top plate fixed on the top of the pair of support plates; the working disc is circular and rotatably installed on the top surface of the center of the base top plate, and five rectangular disc grooves are evenly radially formed on the outer circumferential surface of the working disc, and a printing table is arranged in each disc groove; a feeding station, a first printing station, a second printing station, a discharging station and a maintenance station are evenly arranged on the top surface of the base top plate along the outer periphery of the working disc; the feeding conveying device and the detecting device are correspondingly installed on the base top plate with the feeding station; the detecting device comprises a first bracket, a second bracket, two adjusting rods, a contour positioning camera and two pairs of corner positioning cameras; the first screen printing head and the second screen printing head are correspondingly installed on the base top plate with the first printing station and the second printing station; the first screen printing head comprises an up-down adjusting mechanism, a front-rear adjusting mechanism, a left-right adjusting mechanism, an angle adjusting mechanism and a printing mechanism; the angle adjusting mechanism comprises an upper base plate, a base frame plate, four guide wheels, a screen frame and a second driving mechanism; the upper base plate is installed on the two left-right guide rails of the left-right adjusting mechanism and is driven by a left-right linear motor; the base frame plate is rectangular and connected to the front end of the upper base plate; the four guide wheels are correspondingly installed on the four corner top surfaces of the base frame plate; the screen frame is installed on the top surface of the base frame plate, and the four corners of the screen frame have inverted corner guide rails that are correspondingly connected to the four guide wheels on the base frame plate; the second driving mechanism comprises an angle adjusting guide rail installed on the middle of the rear end of the base frame plate and in the left-right direction, an angle adjusting linear motor installed on the base frame plate and a dial wheel installed on the angle adjusting guide rail through a guide wheel support and embedded in an arc-shaped groove formed on the middle rear end surface of the screen frame and driven by the angle adjusting linear motor; the discharging conveying device is correspondingly installed on the base top plate with the discharging station. The feeding conveyor transports two silicon solar cells to a printing table on the work turntable at regular intervals. The detection device detects the position of the two silicon solar cells on the printing table at the feeding station and transmits the positional deviation data of the two silicon solar cells on the printing table to the controller of the printing equipment for adjustment by the first and second screen printing heads. The work turntable rotates 72° to move the printing table receiving the two silicon solar cells to the first printing station, where the first screen printing head prints the pattern on one silicon solar cell. The work turntable rotates another 72° to move the printing table receiving the two silicon solar cells to the second printing station, where the second screen printing head prints the pattern on the other silicon solar cell. The work turntable rotates another 72° to move the printing table receiving the two silicon solar cells to the unloading station, where the unloading conveyor transports the two silicon solar cells with printed patterns out of the printing equipment.

2. The rotary disc photovoltaic cell screen printing apparatus according to claim 1, wherein, The working turntable is a direct-drive motor rotary worktable installed at the center of the top surface of the base plate.

3. The rotary photovoltaic cell screen printing apparatus of claim 1, wherein, Each printing table includes two paper rolls, one inside and one outside, spanning the two side walls of the turntable groove; three paper guide rollers, corresponding to the upper inner end, upper outer end, and lower outer end of the groove; two printing table motors, corresponding to one end of the two paper rolls, rotatably connected; and a printing table paper strip wrapped around the two paper rolls and the three paper guide rollers.

4. The screen printing apparatus for a rotary disc photovoltaic cell according to claim 3, wherein The printing table paper tape has several ventilation holes evenly distributed and is equipped with a vacuum nozzle.

5. The rotary photovoltaic cell screen printing apparatus of claim 1, wherein, The feeding and conveying device includes a feeding chassis mounted on the top surface of the base plate and driven by a DD direct drive motor, a conveyor belt drive motor mounted on the feeding chassis, a conveying device bracket fixed on the feeding chassis and having two pairs of support rods, a drive belt shaft mounted on the inner ends of the two pairs of support rods and connected to the conveyor belt drive motor via a belt transmission mechanism, two pairs of drive belt pulleys mounted at intervals on the drive belt shaft, two pairs of driven belt pulleys each mounted on the outer ends of the two pairs of support rods via tensioning sliders, and two pairs of conveyor belts wound between the two pairs of drive belt pulleys and the two pairs of driven belt pulleys. The structure of the unloading conveyor is the same as that of the loading conveyor.

6. The rotary photovoltaic cell screen printing apparatus of claim 1, wherein, The first bracket is shaped like a gate and fixed to the top surface of the base plate; the second bracket includes a horizontal baffle spanning the inner middle surfaces of the two vertical plates of the first bracket and a king-shaped horizontal frame fixed to the inner middle surface of the horizontal baffle. Each of the three wing rods of the horizontal frame has a lateral sliding groove along its length. Two adjusting rods are respectively installed in the lateral sliding grooves of the three wing rods on both sides of the web of the horizontal frame of the second bracket through three horizontal frame sliders. Each of the two adjusting rods has a longitudinal sliding groove along its length. The contour positioning camera is fixed to the center of the top surface of the web of the horizontal frame. Two pairs of corner positioning cameras are respectively suspended in the longitudinal sliding grooves of the two adjusting rods through adjusting rod sliders.

7. The rotary photovoltaic cell screen printing apparatus of claim 1, wherein, The up-down adjusting mechanism comprises four guide sleeves respectively inserted into four through holes formed on the top plate of the base, four lead screws respectively inserted into the four guide sleeves, four lead screw nuts respectively mounted on the four lead screws, four lifting rods respectively connected to the four lead screw nuts, and a first driving mechanism mounted below the top plate of the base. The first driving mechanism comprises a mechanism base plate sleeved on the lower ends of the four guide sleeves, a driving motor mounted on the middle part of the mechanism base plate, a motor pulley mounted on the rotating shaft of the driving motor, four lead screw pulleys respectively mounted on the lower ends of the four lead screws, and a transmission belt wound around the motor pulley and the four lead screw pulleys. The front-rear adjusting mechanism comprises a lower base plate mounted on the top surfaces of the four lifting rods of the up-down adjusting mechanism, two front-rear guide rails mounted on the top surface of the lower base plate, and a front-rear linear motor mounted on the top surface of the lower base plate and located between the two front-rear guide rails. The left-right adjusting mechanism comprises a middle base plate mounted on the two front-rear guide rails of the front-rear adjusting mechanism and driven by the front-rear linear motor, two left-right guide rails mounted on the top surface of the middle base plate, and a left-right linear motor mounted on the top surface of the middle base plate and located between the two left-right guide rails. The printing mechanism is mounted on the base frame plate of the angle adjusting mechanism. The structure of the second screen printing head is the same as that of the first screen printing head.

8. The screen printing apparatus for a rotary disc photovoltaic cell according to any one of claims 1 to 7, characterized in that, The printing device further comprises an input conveying device connected to the outer end of the input conveying device and an output conveying device connected to the outer end of the output conveying device. The structure of the output conveying device is the same as that of the input conveying device.

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