Position adjusting system for printing head on rotating disc type photovoltaic screen printing machine

Abstract

The utility model discloses a position adjusting system for a printing head on a rotating disc type photovoltaic screen printing machine. The position adjusting system comprises a base plate, three movable supporting seats, a fixed supporting seat, two screen printing plate supporting air cylinders, a screen printing plate movable bottom plate and a screen printing plate mounting frame. The top face of the base plate is provided with two rectangular channels of X-direction channels and two rectangular channels of Y-direction channels. The three movable supporting seats are installed in the middle of one X-direction channel and in the middle of the two Y-direction channels of the base plate. The fixed supporting seat is mounted in the middle of the other X-direction channel; the two screen supporting air cylinders are installed in the two X-direction channels. The screen printing plate moving bottom plate is mounted on inner rings of the crossed roller bearings at the tops of the three moving supporting seats and inner rings of the crossed roller bearings at the top of the fixed supporting seat; the screen installation frame is installed on the top face of the screen moving bottom plate and connected with the two conical heads penetrating out of the two guide holes in the screen moving bottom plate in a clamped mode through the two caulking grooves. According to the utility model, the printing registration precision of the printing head and the silicon crystal battery piece can be further improved.

Description

Technical Field

[0001] This utility model relates to a position adjustment system for the printing head on a rotary photovoltaic screen printing machine. Background Technology

[0002] Screen printing (printing conductive silver paste onto silicon wafers) is the most crucial step in solar panel fabrication, directly determining the panel's power generation efficiency. With advancements in science and technology, the power output of solar panels continues to increase, placing increasingly higher demands on fabrication equipment, especially the screen printing section. Current products typically have a linewidth of around 25μm, with line-to-line registration requirements generally within ±5-10μm. However, with continuous technological progress and cost considerations, printed lines are becoming increasingly finer, with new technologies achieving linewidths less than 20μm. This necessitates even higher registration precision to meet the demands of new technology production and widespread adoption.

[0003] Currently available photovoltaic (PV) cell screen printing equipment includes linear interactive and track-type designs. However, the precision, speed, and stability of these designs sometimes fail to meet the printing requirements of PV silicon wafers. Another type is the rotary photovoltaic screen printing machine, which employs a five-station rotary conveyor system, along with a detection device and two adjustable screen printing heads. This machine achieves breakthroughs in precision and stability, effectively improving the screen printing quality of silicon wafers and increasing production efficiency. This rotary photovoltaic screen printing machine includes a base 1, a rotary worktable 2, a feeding conveyor 8, a loading conveyor 3, a vision inspection device 4, a first screen printing head 5, a second screen printing head 6, a unloading conveyor 7, and an output conveyor 9 (see Chinese Patent CN202322694766.1 and see...). Figure 1 The first screen printing head 5 is used to screen print silver paste onto a silicon solar cell 10. It is adjustable in the X, Y, Z directions and T (angle). Before printing, based on the positional deviation data of the silicon solar cell 10 obtained by the vision inspection device 4, it is quickly adjusted to be flush with the position of another silicon solar cell 10 on the printing table 20 before printing. The second screen printing head 6 has the same structure as the first screen printing head 5. This second screen printing head 6 is flush with the position of another silicon solar cell 10 on the printing table 20 before printing.

[0004] The existing printhead position adjustment system on rotary screen printing machines has the following two drawbacks:

[0005] 1. In the existing rotary screen printing machine, the drive mechanisms involved in the X-axis, Y-axis, and T (angle)-axis adjustment mechanisms of the print head position adjustment system are installed on different levels, that is, there are three coordinate systems for the action execution (see...). Figure 2The detection device (vision processing system) reads and processes data on the same plane. Considering the installation errors of each actuator, the actual results generated by the X, Y and T actuators moving according to the data provided by the detection device deviate from the data provided by the detection device.

[0006] 2. Existing screen printing equipment uses an independent servo motor to drive the screen frame rotation when adjusting the T-angle of the printing head. This means that once the equipment is assembled, the rotation axis of the T-axis coordinate system is fixed. During subsequent plate making, each graphic must perfectly align with the T-axis rotation axis at its center within the screen frame. However, deviations are unavoidable during actual plate making, and these deviations are not constant. These deviations cannot be factored into the data processing of the subsequent actuators. Existing equipment often ignores this data, assuming that the center of each graphic on the screen coincides with the T-axis rotation axis during plate making. This also leads to deviations in the execution results in actual production. Utility Model Content

[0007] The purpose of this invention is to overcome the defects of the prior art and provide a position adjustment system for the printing head on a photovoltaic screen printing machine. It further improves the printing registration accuracy between the printing head and the silicon crystal solar cells on the printing table, and meets the printing registration requirements for finer lines.

[0008] The purpose of this utility model is achieved as follows: a position adjustment system for the printing head on a rotary photovoltaic screen printing machine, the rotary photovoltaic screen printing machine including a worktable, a work turntable, a vision inspection device, and two screen printing heads; the position adjustment system for the printing head includes a base plate, three movable support seats, one fixed support seat, two screen support cylinders, a screen moving base plate, and a screen mounting frame; wherein...

[0009] The substrate is a rectangular plate with a rectangular through hole in the middle and an outer frame around it. The substrate is mounted on the top surface of the worktable by a Z-axis adjustment mechanism. An inner frame is provided on the top surface of the substrate around the through hole, and a rectangular channel with two X-axis channels and two Y-axis channels is formed between the inner frame and the outer frame.

[0010] Three movable support bases are installed one-to-one in the middle of one X-direction channel and the middle of two Y-direction channels of the base plate; each movable support base includes a mechanism base plate, a pair of lower cross roller guides installed on the top surface of the mechanism base plate, a lower moving block installed on the lower cross roller guides, a ball nut connected to the lower moving block, a ball screw installed on the ball nut, a drive motor connected to the ball screw, a pair of upper cross roller guides installed on the top surface of the lower moving block and perpendicular to the pair of lower cross roller guides, an upper moving block installed on the upper cross roller guides, and a cross roller bearing installed in the center of the top surface of the upper moving block;

[0011] The fixed support is installed in the middle of another X-direction channel of the base plate. The fixed support includes a mechanism base plate, a pair of lower cross roller guides installed on the top surface of the mechanism base plate, a lower moving block installed on the lower cross roller guides, a pair of upper cross roller guides installed on the top surface of the lower moving block and perpendicular to the pair of lower cross roller guides, an upper moving block installed on the upper cross roller guides, and a cross roller bearing installed in the center of the top surface of the upper moving block.

[0012] Two screen support cylinders are installed in the two X-direction channels in a one-to-one correspondence, and a conical head is installed at the center of the top surface of the piston rod of each screen support cylinder;

[0013] The screen printing movable base plate is a rectangular frame plate and is installed with screws on the inner ring of the cross roller bearings on the top of the three movable support seats and the inner ring of the cross roller bearings on the top of the fixed support seat; a guide hole is opened on each of the two long sides of the screen printing movable base plate, which is coaxial with the piston rods of the two screen printing support cylinders, so that when the piston rods of the two screen printing support cylinders extend at the same time, they are inserted into the two guide holes one by one.

[0014] On the bottom surface of each of the two long sides of the screen mounting frame, there is a lower guide strip with an L-shaped cross-section. On the horizontal part of each of the two lower guide strips, there is a groove that matches the conical head on each of the two screen support cylinders. The screen mounting frame is installed on the top surface of the screen moving base plate and is engaged with the two conical heads that protrude from the two guide holes on the screen moving base plate through the two grooves.

[0015] In the aforementioned rotary photovoltaic screen printing machine, the printing head position adjustment system includes an upper guide bar with an L-shaped cross-section fixed to the top surface of each of the two long sides of the screen moving base plate, which engages with the two lower guide bars on the screen mounting frame.

[0016] In the aforementioned rotary photovoltaic screen printing machine's printing head position adjustment system, a limiting block is fixed on each of the two sides of the top surface of the front short side of the screen moving base plate.

[0017] The position adjustment system for the printing head on the photovoltaic screen printing machine of this utility model has the following features:

[0018] 1. The position adjustment system of this utility model uses the rotation plane of three moving support seats driven by servo motors and one fixed support seat as four support points to form the X-axis, Y-axis and T-axis actuators integrated into the same coordinate plane. There is no error in the basic coordinate system, which is consistent with the reference of the data detected by the vision inspection device, and the deviation caused by the screen moving base plate will be greatly reduced.

[0019] 2. The center position of the T-axis in the position adjustment system of this utility model can be set arbitrarily in the coordinate plane, which can compensate for the deviation of the center position of the graphic generated in different printing processes, and greatly improve the printing registration accuracy of the silicon crystal solar cell between the printing head and the printing table. Attached Figure Description

[0020] Figure 1 This is a perspective view of the photovoltaic screen printing machine involved in this utility model;

[0021] Figure 2 This is a perspective view of the printhead position adjustment system on a conventional photovoltaic screen printing machine;

[0022] Figure 3 This is a perspective view of the printing head position adjustment system on the photovoltaic screen printing machine of this utility model;

[0023] Figure 4 This is a perspective view of the position adjustment system of this utility model without the screen moving base plate and the screen mounting frame;

[0024] Figure 4a This is a perspective view of the movable support base in the position adjustment system of this utility model;

[0025] Figure 4b This is a perspective view of the fixed support base in the position adjustment system of this utility model;

[0026] Figure 4c This is a perspective view of the screen support cylinder in the position adjustment system of this utility model;

[0027] Figure 5 This is a perspective view of the position adjustment system of this utility model after removing the screen moving base plate;

[0028] Figure 6 This is a perspective view of the position adjustment system of this utility model after removing the two upper guide strips on the screen moving base plate;

[0029] Figure 7This is a perspective view of the screen mounting frame in the position adjustment system of this utility model from a bottom angle.

[0030] Figure 7a This is a vertical cross-sectional view of the mounting structure of the screen mounting frame in the position adjustment system of this utility model;

[0031] Figure 8 This is a schematic diagram of the position adjustment system for the printing head on a photovoltaic screen printing machine according to this utility model.

[0032] Figure 9 This is a plan view of the four adjustment states of the position adjustment system of this utility model. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings.

[0034] Please see Figures 3 to 7a And in conjunction with reference Figure 1 The present invention relates to a rotary photovoltaic screen printing machine with a printing head position adjustment system. The rotary photovoltaic screen printing machine includes a worktable 1, a work turntable 2, a vision inspection device 4, and two screen printing heads 5 and 6.

[0035] The position adjustment system of the printing head 6 includes a base plate 60, three movable support seats 61, one fixed support seat 62, two screen support cylinders 63, a screen moving base plate 64, and a screen mounting frame 65.

[0036] The substrate 60 is a rectangular plate with a rectangular through hole in the middle and an outer frame 601 around the perimeter. The substrate 60 is mounted on the top surface of the workbench 1 by a Z-axis adjustment mechanism. An inner frame 602 is provided on the top surface of the substrate 60 around the through hole. A rectangular channel with two X-axis channels 60x and two Y-axis channels 60y is formed between the inner frame 602 and the outer frame 601.

[0037] Three movable support bases 61 are installed one-to-one in the middle of one X-direction channel 60x and the middle of two Y-direction channels 60y on the base plate 60. Each movable support base 61 includes a mechanism base plate 610, a pair of lower cross roller guides 611 mounted on the top surface of the mechanism base plate 610, a lower moving block 612 mounted on the lower cross roller guides 611, a ball nut 616 connected to the lower moving block 612, a ball screw 617 mounted on the ball nut 616, a drive motor 619 connected to the ball screw 617 via a coupling 618, a pair of upper cross roller guides 613 mounted on the top surface of the lower moving block 612 and perpendicular to the pair of lower cross roller guides 611, an upper moving block 614 mounted on the upper cross roller guides 613, and a cross roller bearing 615 mounted on the center of the top surface of the upper moving block 614. The upper moving block 614 is fixedly connected to the outer ring of the cross roller bearing 615.

[0038] A fixed support 62 is installed in the middle of another X-direction channel 60x of the base plate 60. The fixed support 62 includes a mechanism base plate 610, a pair of lower cross roller guides 611 installed on the top surface of the mechanism base plate 610, a lower moving block 612 installed on the lower cross roller guides 611, a pair of upper cross roller guides 613 installed on the top surface of the lower moving block 612 and perpendicular to the pair of lower cross roller guides 611, an upper moving block 614 installed on the upper cross roller guides 613, and a cross roller bearing 615 installed in the center of the top surface of the upper moving block 614. The upper moving block 614 is fixedly connected to the outer ring of the cross roller bearing 615.

[0039] Two screen support cylinders 63 are installed in the two X-direction channels 60x in a one-to-one correspondence, and a conical head 630 is installed at the center of the top surface of the piston rod of each screen support cylinder 63.

[0040] The screen printing movable base plate 64 is a rectangular frame plate and is installed with screws on the inner ring of the cross roller bearing 615 on the top of the three movable support seats 61 and the inner ring of the cross roller bearing 615 on the top of the fixed support seat 64. Each of the two long sides of the screen printing movable base plate 64 has a guide hole 640 that is coaxial with the piston rod of each of the two screen printing support cylinders 63, so that when the piston rods of the two screen printing support cylinders 63 extend at the same time, they are inserted into the two guide holes one by one. Each of the two long sides of the screen printing movable base plate 64 has an upper guide bar 641 with an L-shaped cross section installed on the top surface of each of the two long sides by screws. Each of the two sides of the top surface of the front short side of the screen printing movable base plate 64 has a limiting block 642 fixed.

[0041] On the bottom surface of each of the two long sides of the screen mounting frame 65, there is a lower guide bar 651 with an L-shaped cross-section. The horizontal parts of the two lower guide bars 651 are located at the bottom of the horizontal parts of the two upper guide bars 641 respectively. Each of the horizontal parts of the two lower guide bars 651 has a groove 650 that matches the conical head 630 on the two screen support cylinders 63. The screen mounting frame 65 is mounted on the top surface of the screen moving base plate 64 and is engaged with the two conical heads 630 that protrude from the two guide holes on the screen moving base plate 64 through the two grooves 650 respectively.

[0042] This utility model relates to a position adjustment system for the printing head on a rotary photovoltaic screen printing machine, wherein...

[0043] The two upper guide bars 641 on the screen printing moving base plate 64 and the two lower guide bars 651 on the screen printing mounting frame 65 facilitate the quick installation of the screen printing mounting frame 65, and make the two grooves on the screen printing mounting frame 65 accurately coaxial with the piston rods of the two screen printing support cylinders 63.

[0044] A screen is installed in the inner hole of the two upper guide bars 641 and the screen mounting frame 65, and the screen has the graphics to be printed on it. When changing the screen, the piston rods of the two screen support cylinders 63 are retracted, so that the two conical heads 630 are withdrawn from the two slots 650 on the screen mounting frame 65 one by one. Then, the screen mounting frame 65 is moved backward along the two upper guide bars 641 on the screen moving base plate 64. After the screen is replaced, the screen mounting frame 65 is moved forward along the two upper guide bars 641 on the screen moving base plate 64 until the front end of the screen mounting frame 65 touches the screen fixed on the screen moving base plate 65. The two limiting blocks 642 on the moving base plate 64 are positioned so that the two grooves on the screen mounting frame 65 are coaxial with the piston rods of the two screen support cylinders 63. The piston rods of the two screen support cylinders 63 are extended, so that the two conical heads 630 are inserted into the two grooves 650 on the screen mounting frame 65. The piston rods of the two screen support cylinders 63 are also inserted into the two guide holes on the screen moving base plate 64. In this way, the screen mounting frame 65 is installed on the screen moving base plate 64 and moves and rotates with the screen moving base plate 64.

[0045] The position adjustment system for the printing head on a rotary photovoltaic screen printing machine of this utility model includes three movable support seats 61. When the drive motor 619 provides power, the rotation of the ball screw 616 is converted into the linear movement of the ball nut 617 on the ball screw 617. This causes the lower movable block 612, the upper cross roller guide rail 613 mounted on the lower movable block 612, the upper movable block 614, and the cross roller bearing 615 to move together along the lower cross roller guide rail 611 along the axial direction of the ball screw 617. The upper movable block 614, along with the cross roller bearing 615, can also passively move along the direction perpendicular to the ball screw 617 from the upper cross roller guide rail 613, while the cross roller bearing 615 can rotate around the center. The fixed support 62, the movable block 612, the upper cross roller guide 613 mounted on the lower movable block 612, the upper movable block 614, and the cross roller bearing 615 move passively together on the lower cross roller guide 611. The upper movable block 614, along with the cross roller bearing 615, can also move passively along the direction perpendicular to the ball screw 617 of the upper cross roller guide 613, while the cross roller bearing 615 can rotate around the center. The three movable supports 61 and the fixed support 62 constitute the four support points A, B, C, and D of the screen printing movable base plate 64.

[0046] Please see again Figure 8 and Figure 9 The working principle of the printing head position adjustment system on the rotary photovoltaic screen printing machine of this utility model when adjusted in the following four situations is as follows:

[0047] 1. When the vision inspection device 4 of the printing press detects that the center of the screen and the silicon solar cell on the printing table are not aligned and there is a positional deviation along the X-axis (see...) Figure 9 a) When the vision processing system provides adjustment data requiring X-axis movement of the pattern on the screen on the printing head, the drive motors 619 of the two corresponding moving support seats 61 installed in the two Y-axis channels 60y of the substrate 60 do not provide power, and the brakes are locked. The drive motor 619 of the moving support seat 61 (support point A) installed in one of the X-axis channels 60x of the substrate 60 calculates the rotation based on the data provided by the vision processing system and the pitch of the ball screw 617, and rotates a certain number of revolutions according to the calculated result. At this time, the entire screen moving base plate 64 and the screen mounting frame 65 that has been positioned move along the X-axis as a whole, and the other two support points B, C and support point D move accordingly (see...). Figure 8 ).

[0048] 2. When the vision inspection device 4 of the printing press detects that the center of the screen and the silicon solar cell on the printing table are not aligned and there is a Y-axis positional deviation (see... Figure 9(b) When the vision processing system provides adjustment data requiring the graphic on the screen to move along the Y-axis, the drive motor 619 of the movable support 61 (support point A) installed in one of the X-axis channels 60x of the base plate 60 does not provide power, and the brake is locked. The drive motors 619 of the two movable support 61s installed in the two Y-axis channels 60y of the base plate 60, which are correspondingly installed in one-to-one, are converted according to the data given by the vision processing system and the pitch of the ball screw 617, and rotate the same number of revolutions according to the conversion result. At this time, the entire screen moving base plate 64 and the screen mounting frame 65 that has been positioned on it move along the Y-axis as a whole, and the other two support points A and support points D move accordingly (see...). Figure 8 ).

[0049] 3. When the vision inspection device 4 of the printing press detects that the center of the screen and the silicon solar cell on the printing table are not aligned and there is an angular deviation (see...) Figure 9 c) When the vision processing system provides adjustment data requiring the graphic on the screen to rotate around the T-axis, the drive motors 619 of the three movable support seats 61 calculate the rotation based on the data provided by the vision processing system and the pitch of the ball screw 617, and rotate a different number of revolutions according to the calculation result. At this time, the entire screen movable base plate 64 and the screen mounting frame 65 that has been positioned on it rotate around the central T-axis of the screen movable base plate 64. During the process, the four support points A, B, C, and D all have X-axis movement, Y-axis movement, and rotation around the center of their respective support points (see...). Figure 8 ).

[0050] 4. When the vision inspection device 4 of the printing press detects that the center of the screen and the silicon solar cell on the printing table are not aligned, resulting in both angular deviation and X-axis positional deviation and Y-axis positional deviation (see...) Figure 9 d) When the vision processing system provides adjustment data requiring the graphic on the screen to move along the X-axis and Y-axis and rotate around the T-axis, the drive motors 619 of the three moving support seats 61 calculate the rotation based on the data provided by the vision processing system and the pitch of the ball screw 616, and rotate a different number of revolutions according to the calculation result. At this time, the entire screen moving base plate 64 and the screen mounting frame 65 that has been positioned on it rotate around the center T-axis of the screen moving base plate 64. During the process, the four support points A, B, C, and D all have X-axis movement, Y-axis movement, and rotation around the center of their respective support points (see...). Figure 8 ).

[0051] The position adjustment system of the printing head on the rotary photovoltaic screen printing machine of this utility model uses three moving support seats 61 driven by servo motors and one fixed support seat 62 as four support points to form rotation and translation planes in the X, Y and T directions; combined with the graphic data read by the vision inspection device 4 and the deviation value of the analysis data, it completes high-precision registration printing of the graphic.

[0052] The above embodiments are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.

Claims

1. A position adjustment system for the printing head on a rotary photovoltaic screen printing machine, the rotary photovoltaic screen printing machine comprising a worktable, a work turntable, a vision inspection device, and two screen printing heads; the position adjustment system for the printing head comprises a base plate, three movable support seats, one fixed support seat, two screen support cylinders, a screen moving base plate, and a screen mounting frame; characterized in that, The substrate is a rectangular plate with a rectangular through hole in the middle and an outer frame around it. The substrate is mounted on the top surface of the worktable by a Z-axis adjustment mechanism. An inner frame is provided on the top surface of the substrate around the through hole, and a rectangular channel with two X-axis channels and two Y-axis channels is formed between the inner frame and the outer frame. Three movable support bases are installed one-to-one in the middle of one X-direction channel and the middle of two Y-direction channels of the base plate; each movable support base includes a mechanism base plate, a pair of lower cross roller guides installed on the top surface of the mechanism base plate, a lower moving block installed on the lower cross roller guides, a ball nut connected to the lower moving block, a ball screw installed on the ball nut, a drive motor connected to the ball screw, a pair of upper cross roller guides installed on the top surface of the lower moving block and perpendicular to the pair of lower cross roller guides, an upper moving block installed on the upper cross roller guides, and a cross roller bearing installed in the center of the top surface of the upper moving block; The fixed support is installed in the middle of another X-direction channel of the base plate. The fixed support includes a mechanism base plate, a pair of lower cross roller guides installed on the top surface of the mechanism base plate, a lower moving block installed on the lower cross roller guides, a pair of upper cross roller guides installed on the top surface of the lower moving block and perpendicular to the pair of lower cross roller guides, an upper moving block installed on the upper cross roller guides, and a cross roller bearing installed in the center of the top surface of the upper moving block. Two screen support cylinders are installed in the two X-direction channels in a one-to-one correspondence, and a conical head is installed at the center of the top surface of the piston rod of each screen support cylinder; The screen printing movable base plate is a rectangular frame plate and is installed with screws on the inner ring of the cross roller bearings on the top of the three movable support seats and the inner ring of the cross roller bearings on the top of the fixed support seat; a guide hole is opened on each of the two long sides of the screen printing movable base plate, which is coaxial with the piston rods of the two screen printing support cylinders, so that when the piston rods of the two screen printing support cylinders extend at the same time, they are inserted into the two guide holes one by one. On the bottom surface of each of the two long sides of the screen mounting frame, there is a lower guide strip with an L-shaped cross-section. On the horizontal part of each of the two lower guide strips, there is a groove that matches the conical head on each of the two screen support cylinders. The screen mounting frame is installed on the top surface of the screen moving base plate and is engaged with the two conical heads that protrude from the two guide holes on the screen moving base plate through the two grooves.

2. The position adjustment system for the printing head on a rotary photovoltaic screen printing machine according to claim 1, characterized in that, On the top surface of each of the two long sides of the screen printing movable base plate, there is an upper guide bar with an L-shaped cross section, which is engaged with the two lower guide bars on the screen printing mounting frame.

3. The position adjustment system for the printing head on a rotary photovoltaic screen printing machine according to claim 1 or 2, characterized in that, A limiting block is fixed on each of the two sides of the top surface of the front short side of the screen printing movable base plate.

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