A solar screen printing device

Abstract

The present application relates to a kind of solar screen printing device, and the printing table of the device is provided with bracket, bracket includes backrest plate and flat support plate, and bracket is provided with feeding device, feeding device includes slurry disc and two scraper groups, each scraper group includes upper scraper and lower scraper, slurry disc is located between upper scraper and lower scraper, and guide plate is connected between upper scraper and lower scraper, backrest plate is provided with guide slot, and upper scraper is coupled in guide slot by connecting assembly, and upper scraper is connected with electric push rod by cross arm, and when electric push rod is retracted, the corresponding side scraper group can be controlled to move in horizontal direction, to complete the printing of silicon wafer;The beneficial effects of the present application are that two scraper groups move from middle to both sides simultaneously, and print a screen simultaneously, so that the printing efficiency is higher.

Description

Technical Field

[0001] This invention relates to the field of solar cell technology, specifically to a solar cell screen printing assembly. Background Technology

[0002] With the transformation of the global energy structure, solar energy, as a clean and renewable energy source, has been widely used and promoted. As an important part of the solar panel manufacturing process, screen printing of solar panels is conducive to promoting the development of the solar energy industry and optimizing the energy structure.

[0003] In the prior art, a screen printing component is disclosed, with document number CN217293874U, which includes a screen frame, partitions, a squeegee, and a closing member. The screen frame is a rectangular frame structure with a designed length and width.

[0004] However, in the above scheme, when printing on the screen, the squeegee is pushed to move from one end of the screen to the other along the length of the partition. Due to the long travel distance, the printing efficiency of the squeegee is low. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a printing component suitable for solar screen printing that can quickly and efficiently print on a screen.

[0006] To achieve the above objectives, the technical solution of the present invention is: a solar screen printing device, including a printing table fixed on a base, a first groove for placing silicon wafers on the printing table, and a printing component above the printing table, which can print on the silicon wafers;

[0007] The printing assembly includes a bracket, which is set above the printing table. A feeding device is installed inside the bracket. The bracket includes two parallel back plates, both of which are vertically arranged. Two flat support plates are connected between the two back plates.

[0008] Two guide grooves are provided on the two opposite sides of the two back panels, and a driving device is provided on each flat support plate.

[0009] The feeding device includes a slurry tray and two scraper sets. Each scraper set is connected to a drive device on the corresponding side. The drive device controls the two scraper sets to move from the middle position of the screen to both ends. The two scraper sets move in opposite directions.

[0010] Each scraper assembly includes an upper scraper and a lower scraper, with a slurry tray located between the upper and lower scrapers. The upper scraper is connected to the guide groove on the corresponding side via a connecting assembly, and the upper scraper is connected to the drive unit via a cross arm.

[0011] Furthermore, the upper scraper is provided with a raised strip, and a connecting plate is connected to the inner end of the cross arm. The connecting plate is provided with a groove with a "U" shaped cross section. The raised strip fits into the groove and can slide along the length of the groove.

[0012] Furthermore, a vertical plate passes through the horizontal arm, and the vertical plate can move along the length of the horizontal arm. A guide plate is connected to the lower end of the vertical plate, and the guide plate is connected to the lower scraper on the corresponding side. When the vertical plate moves, it drives the corresponding lower scraper to move through the guide plate.

[0013] Furthermore, the guide plate is elongated and has an arc-shaped cross-section. The lower side of the guide plate has a side notch, and the lower side of the guide plate is connected to the corresponding lower scraper. The upper side of the guide plate is connected to the corresponding vertical plate.

[0014] Furthermore, an inner baffle is provided on the cross arm, which is positioned between the vertical plate and the drive device. A compression return spring is sleeved on the cross arm, located between the vertical plate and the inner baffle.

[0015] Furthermore, a second groove is provided on the slurry tray, and the upper scraper is located in the second groove.

[0016] Furthermore, the guide groove includes a first horizontal groove and a second horizontal groove arranged in parallel. The length of the first horizontal groove is less than the length of the second horizontal groove. Both ends of the first horizontal groove are connected to inclined grooves, and the lower end of the inclined grooves is connected to the second horizontal groove.

[0017] Furthermore, a notch is provided on the side of the second transverse groove near the electric push rod. The length of the notch is less than the length of the second transverse groove. The notch is inclined and a side baffle is provided inside the notch. The side baffle is hinged to the top surface of the second transverse groove.

[0018] Furthermore, a smooth groove is connected to one end of the guide groove near the drive device, and the smooth groove communicates with the second transverse groove.

[0019] To achieve the above objectives, the technical solution of the present invention is as follows: A support frame is provided on the printing table of this device. The support frame includes a back plate and a flat support plate. A feeding device is provided inside the support frame. The feeding device includes a paste tray and two squeegee sets. Each squeegee set includes an upper squeegee and a lower squeegee. The paste tray is located between the upper and lower squeegees. A guide plate connects the upper and lower squeegees. A guide groove is provided on the back plate. The upper squeegee is coupled into the guide groove through a connecting component. The upper squeegee is connected to an electric push rod through a cross arm. When the electric push rod extends or retracts, it can control the corresponding squeegee set to move from the middle to both sides, thereby completing the printing of the silicon wafer. Since two squeegee sets print on one screen simultaneously, the printing efficiency is higher. Attached Figure Description

[0020] Figure 1 This is a front view diagram of the state before the invention begins to operate;

[0021] Figure 2 This is a diagram showing the state of the screen printing plate after printing according to the present invention.

[0022] Figure 3 This is a top view of the slurry tray structure of the present invention;

[0023] Figure 4 This is a side view of the slurry tray structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the connection structure between the cross arm and the connecting plate of the present invention;

[0025] Figure 6 This is a side view of the connecting plate structure of the present invention;

[0026] Figure 7 This is a schematic diagram of the main structure of the guide plate of the present invention;

[0027] Figure 8 This is a top view of the guide vane structure of the present invention;

[0028] Figure 9 This is a side view of the connection structure between the scraper and the connecting assembly of the present invention;

[0029] Figure 10 A schematic diagram of the main structure of the guide groove for the invention;

[0030] Figure 11 This is a schematic diagram of the main cross-sectional structure of the side baffle of the present invention in its initial state and connected to the guide groove;

[0031] Figure 12 This is a diagram showing the motion state of the scraper assembly during reset according to the present invention;

[0032] In the diagram, 1-base, 2-printing table, 3-first groove, 4-screen, 5-screen fixing device, 501-slider, 502-fixing block, 6-back plate, 7-flat support plate, 8-slurry tray, 9-second groove, 10-mesh hole, 11-horizontal arm, 12-electric push rod, 13-upper scraper, 14-lower scraper, 15-protruding strip, 16-connecting plate, 17-slide groove, 18-guide plate, 19-side notch, 20-vertical plate, 21-inner baffle, 22-compression return spring, 23-inner baffle arm, 24-guide groove, 25-connecting shaft, 26-fixing plate, 27-connecting block, 28-bolt, 29-first horizontal groove, 30-second horizontal groove, 31-first inclined groove, 32-second inclined groove, 33-notch, 34-side baffle, 35-support leg, 36-nut, 37-smooth groove. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. In the embodiments, the components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0034] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to an electrical connection; they can refer to a hydraulic connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] See Figure 1 and Figure 2 As shown, a solar cell screen printing device includes a printing table 2 fixed on a base 1. The printing table 2 has a first groove 3, which can be used to place silicon wafers for making solar cells. After the silicon wafer is placed in the first groove 3, a screen 4 needs to be placed on top of the silicon wafer. A screen fixing device 5 is provided on the printing table 2 to facilitate fixing the screen. A printing component is provided above the screen fixing device 5. The printing component is connected to the printing table 2 through a support component. After the screen and silicon wafer are placed and aligned, the printing component prints on the silicon wafer.

[0037] Specifically, the printing assembly includes two parallel back plates 6, both of which are vertically arranged. Two flat support plates 7 are connected between the two back plates 6. The back plates 6 and the flat support plates 7 form a bracket. A feeding device is provided in the bracket. The feeding device includes a paste tray 8 and two squeegee sets. The end of the paste tray 8 is connected to the back plate 6 on the corresponding side. At the same time, the paste tray 8 is located between the two flat support plates 7. Before printing on the screen, the two squeegee sets and the paste tray 8 are all located in the middle position of the screen 4.

[0038] See Figure 3 and Figure 4 As shown, the paste tray 8 has a cavity inside, and a uniform feeding device is connected to the paste tray 8. The uniform feeding device injects printing paste into the cavity inside the paste tray 8. The paste tray 8 is provided with a second groove 9 extending along its length direction. The bottom surface of the second groove 9 is provided with a mesh 10, which communicates with the cavity inside the paste tray 8. When the feeding device injects paste into the paste tray 8 at a uniform speed, the metal paste penetrates upward evenly, allowing the paste to enter the second groove 9. Then, the paste located in the second groove 9 is scraped to both sides by two scraper sets, so that the paste falls onto the printing screen.

[0039] During the process of controlling the scraper assembly to scrape the slurry, the scraper assembly moves horizontally. The scraper assembly is connected to a drive device through the cross arm 11. The drive device is mounted on the flat support plate 7. The drive device is an electric push rod 12 with a telescopic structure. When the electric push rod 12 extends or retracts, it can control the scraper assembly to move.

[0040] See Figure 5 and Figure 6 As shown, the above-mentioned doctor blade assembly includes an upper doctor blade 13 and a lower doctor blade 14. The paste tray 8 is located between the upper doctor blade 13 and the lower doctor blade 14. In the initial state, the upper doctor blade 13 is located in the second groove 9, and the lower doctor blade 14 is located between the paste tray 8 and the printing screen. The upper doctor blade 13 is connected to the electric push rod 12 through the horizontal arm 11. The inner end of the horizontal arm 11 is slidably connected to the upper doctor blade 13, and the outer end of the horizontal arm 11 is connected to the electric push rod 12. A protrusion 15 is provided at the center of the outer side of the upper doctor blade 13. The protrusion 15 extends vertically. A connecting plate 16 is provided on the inner end face of the horizontal arm 11. A groove 17 with a "U" shaped cross section is provided on the side of the connecting plate 16 facing the upper doctor blade 13. The protrusion 15 fits in the groove 17 on the connecting plate 16 and can slide along the length direction of the groove 17.

[0041] See Figure 7 and Figure 8As shown, the lower squeegee 14 is connected to a guide plate 18. The guide plate 18 is a long strip with an arc-shaped cross-section. The lower side of the guide plate 18 is connected to the lower squeegee 14 on the corresponding side. A side notch 19 is provided on the lower side of the guide plate 18. When the electric push rod 12 retracts, the two upper squeegees 13 move from the middle position of the screen to both ends. The upper squeegees 13 can scrape the paste that seeps out of the paste tray 8 from the paste tray 8 onto the guide plate 18. The paste flows through the guide plate 18 to the lower squeegee 14 on the corresponding side and finally falls onto the printing screen through the side notch 19. After that, the paste is spread on the screen by the lower squeegee 14.

[0042] See Figure 1 and Figure 2 As shown, to complete the application of the slurry, a vertical plate 20 is provided on the high side of the guide plate 18. The vertical plate 20 is set vertically, and its lower end is fixedly connected to the high side of the guide plate 18. A through hole is provided on the vertical plate 20, and the horizontal arm 11 connected to the upper scraper 13 passes through the through hole. An inner baffle 21 is provided on the horizontal arm 11, which is located between the vertical plate 20 and the driving device. A compression return spring 22 is sleeved on the horizontal arm 11, which is located between the vertical plate 20 and the inner baffle 21. When both the upper scraper 13 and the lower scraper 14 are located in the middle position of the screen, the compression return spring 22 is in a compressed state. The upper scraper 13 is controlled by the electric push rod 12 to move towards the middle position of the screen. During the movement away from the center of the screen, the guide plate 18 does not move initially. After the upper squeegee 13 separates from the paste tray 8, the paste falls onto the guide plate 18. At this time, the upper squeegee 13 continues to move. When the upper squeegee 13 contacts the vertical plate 20, the vertical plate 20 forms an obstacle to the movement of the upper squeegee 13. At this time, the upper squeegee 13 continues to move along the predetermined path, and the compression return spring 22 returns from the compressed state to the natural state, which can drive the guide plate 18 to move, thereby causing the lower squeegee 14 to move accordingly. Since the paste has now fallen onto the screen at the position on the side of the lower squeegee 14, the movement of the lower squeegee 14 can push and spread the paste, thereby completing the printing of the silicon wafer.

[0043] After the slurry is spread, the upper scraper 13, lower scraper 14, and guide plate 18 need to be reset for the next operation. At this time, the upper scraper 13 is moved towards the center of the screen by the electric push rod 12. Since the compression return spring 22 is in its natural state at this time, it moves towards the center of the screen along with the horizontal arm 11 as the electric push rod 12 operates. The end of the compression return spring 22 applies a pushing force to the vertical plate 20. Because both scraper sets work synchronously during the spreading and resetting processes, when the lower scraper 14 on the two scraper sets contacts, the lower scraper 14 is positioned on the screen. In the middle position, the lower scraper 14 cannot move. As the electric push rod 12 continues to control the horizontal arm 11 to move, the compression return spring 22 gradually compresses until the upper scrapers 13 on the two scraper groups contact each other. At this time, the two upper scrapers 13 return to their initial position in the middle of the slurry tray 8. To ensure that the vertical plate 20 and the guide plate do not deform after the lower scrapers 14 on the two scraper groups contact each other, an inner stop arm 23 is provided on the inner side wall of the guide plate. After the lower scrapers 14 on the two scraper groups just contact each other, the inner end of the inner stop arm 23 just contacts the side of the slurry tray 8.

[0044] See Figure 9 As shown, during the resetting process, the two scrapers above the slurry tray 8 must not contact the second groove 9 on the slurry tray 8 to avoid the upper scrapers 13 scraping the slurry on the second groove 9. Therefore, guide grooves 24 are provided on the two facing sides of the two back plates 6. The two upper scrapers 13 are connected to the guide grooves 24 through connecting components. Each connecting component includes two fixing plates 26, with the scraper located between the two fixing plates 26. A connecting shaft 25 is fixed to the upper end of each fixing plate 26, and a connecting block 27 is provided at the free end of each connecting shaft 25. The connecting block 27 is circular. The central axis of the connecting block 27 and the central axis of the connecting shaft 25 are on the same straight line. The diameter of the connecting block 27 is larger than the diameter of the connecting shaft 25. The connecting block 27 is coupled in the guide groove 24 on the corresponding side. The fixing plate 26 is detachably connected to the scraper. The side of the upper scraper 13 is provided with first threaded holes evenly arranged along its length direction. The fixing plate 26 is also provided with second threaded holes corresponding to the first threaded holes on the side of the upper scraper 13. After aligning several first threaded holes with second threaded holes, bolts 28 are screwed into each threaded hole to detachably connect the two fixing plates 26 to the upper scraper 13.

[0045] See Figure 10 and Figure 11As shown, each backrest plate 6 has two sets of guide grooves 24. The two sets of guide grooves 24 are symmetrically distributed about the central axis of the backrest plate 6. Each guide rail includes two transverse grooves. The two transverse grooves are arranged in parallel. The transverse groove at the higher position is the first transverse groove 29, and the transverse groove at the lower position is the second transverse groove 30. The length of the first transverse groove 29 is less than the length of the second transverse groove 30. Both ends of the first transverse groove 29 are connected with inclined grooves. Both inclined grooves are inclined. The lower end of the inclined groove is docked with the second transverse groove. The inclined groove close to the electric push rod 12 is the first inclined groove 31, and the inclined groove far from the electric push rod 12 is the second inclined groove 32. The two inclined grooves connect the first transverse groove 29 and the second transverse groove 30, and the connection is in an arc transition. At this time, the guide groove is in a square shape with a loop inside;

[0046] At one end of the bottom surface of the second transverse groove 30 close to the electric push rod 12, there is a notch 33. The length of the notch 33 is less than the length of the second transverse groove 30. The notch 33 is inclined. A side baffle 34 is arranged in the notch 33. The side baffle 34 is hinged on the top surface of the second transverse groove 30. The side baffle 34 can flip to the side close to the electric push rod 12. Due to the blocking effect of the notch 33, the side baffle 34 cannot flip to the side far from the electric push rod 12. At the same time, at one end of the guide groove close to the electric push rod 12, there is a smooth groove 37 connected. The horizontal height of the smooth groove 37 is equal to the horizontal height of the second transverse groove 30. The smooth groove 37 is connected with the second transverse groove 30.

[0047] Refer to Figure 12 As shown, the connecting shafts 25 connected to the two upper scrapers above the slurry pan 8 are in the guide grooves 24 and slide along the length direction of the guide grooves 24; the specific movement track of the connecting shaft 25 is: when the electric push rod contracts, it drives the upper scraper to move horizontally. At this time, the connecting shaft 25 moves in the second transverse groove 30. During the moving process, the upper scraper is separated from the slurry pan. When the connecting shaft 25 contacts the side baffle 34, it can lift the side baffle 34 and make the side baffle 34 flip. Then the connecting shaft 25 can slide into the smooth groove. The setting of this smooth groove increases the movable distance of the connecting shaft 25. During the reset process, control the electric push rod 12 to extend. The connecting shaft 25 moves from the smooth groove into the second transverse groove. Due to the blocking effect of the side baffle 34, the connecting shaft 25 will slide along the first inclined groove 31 until it enters the first transverse groove. As the electric push rod 12 continues to extend, at this time, the horizontal height of the upper scraper becomes higher, and it is separated from the slurry pan. After that, the connecting shaft 25 slides from the first transverse groove 29 to the second inclined groove 32, and then slides along the second inclined groove 32 to the end of the second transverse groove 30 far from the electric push rod 12. At this time, the upper scraper contacts the slurry pan again, and the scraper group is reset. When printing the next silicon wafer, as the electric push rod 12 contracts, the connecting shaft 25 moves from the end of the second transverse groove 30 far from the electric push rod 12 to the side of the second transverse groove 30 close to the electric push rod 12. By reciprocating in turn, the printing of multiple silicon wafers can be completed.

[0048] During the reset process, the two connecting shafts 25 connected to the upper scraper 13 move from the lower second transverse groove 30 along the first inclined groove 31 to the higher first transverse groove 29, and their height changes, thus preventing the upper scraper 13 from scraping the slurry on the slurry tray 8 during the reset process.

[0049] There are two screen fixing devices 5 mentioned above. The two screen fixing devices 5 are symmetrically distributed about the central axis of the printing table 2. Each fixing device includes a slider 501 and a fixing block 502. The fixing block 502 is located above the slider 501 and is fixedly connected to the slider 501. The length of the slider 501 is less than the length of the fixing block 502. The slider 501 and the fixing block 502 are flush with the side away from the central axis of the printing table 2. The printing table 2 is provided with a mating groove. The mating groove is provided with blind holes arranged along the length direction of the mating groove. The screen fixing device can slide along the length direction of the mating groove. The fixing block 502 is provided with a through hole. The through hole also passes through the slider 501. That is, the through hole passes through the screen fixing device vertically. A locking bolt can be screwed into the through hole. After the screen is placed above the silicon wafer, the two screen fixing devices are slid along the slide groove 17 to the state where the screen is locked. Then the locking bolt is tightened to fix the screen in a fixed position.

[0050] There are two support components, which are symmetrically distributed about the central axis of the printing table 2. Each support component includes a leg 35. The lower end of the leg 35 is connected to the printing table 2, and the upper end of the leg 35 is passed through a flat support plate 7. The flat support plate 7 can slide along the length of the leg 35. In order to fix the flat support plate 7 in a fixed position on the leg 35, a spring is sleeved on the leg 35. The spring is located between the printing table 2 and the flat support plate 7. The leg 35 is a threaded rod, and a nut 36 is screwed on the free end of the leg 35. The height of the flat support plate 7 can be adjusted to facilitate the replacement of the silicon wafer after printing.

[0051] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be primarily defined by the scope of the claims.

Claims

1. A solar screen printing apparatus, comprising a printing table fixed on a base, wherein a first groove for placing a silicon wafer is provided on the printing table, and a screen is placed on the silicon wafer, characterized in that: A printing assembly is provided above the printing table, which can print on silicon wafers; The printing assembly includes a bracket, which is set above the printing table. A feeding device is installed inside the bracket. The bracket includes two parallel back plates, both of which are vertically arranged. Two flat support plates are connected between the two back plates. Two guide grooves are provided on the two opposite sides of the two back panels, and a driving device is provided on each flat support plate. The feeding device includes a slurry tray and two scraper sets. Each scraper set is connected to a drive device on the corresponding side. The drive device controls the two scraper sets to move from the middle position of the screen to both ends. The two scraper sets move in opposite directions. Each scraper assembly includes an upper scraper and a lower scraper, with a slurry tray located between the upper and lower scrapers. The upper scraper is connected to the guide groove on the corresponding side via a connecting assembly, and the upper scraper is connected to the drive device via a cross arm. The horizontal arm passes through a vertical plate, which can move along the length of the horizontal arm. A guide plate is connected to the lower end of the vertical plate, and the guide plate is connected to the lower scraper on the corresponding side. The horizontal arm is provided with an inner baffle plate, which is located between the vertical plate and the driving device. A compression return spring is sleeved on the horizontal arm, which is located between the vertical plate and the inner baffle plate. When both the upper and lower scrapers are located in the middle position of the screen, the compression return spring is in a compressed state. When the vertical plate moves, it drives the corresponding lower scraper to move through the guide plate. The upper scraper is provided with a protruding strip, and a connecting plate is connected to the inner end of the cross arm. The connecting plate is provided with a sliding groove with a "U" shaped cross section. The protruding strip fits into the sliding groove and can slide along the length of the sliding groove. The guide groove includes a first horizontal groove and a second horizontal groove arranged in parallel. Both ends of the first horizontal groove are connected to inclined grooves, and the lower end of the inclined groove is connected to the second horizontal groove. The second transverse groove has a notch on the side near the electric push rod. The notch is inclined and a side baffle is installed inside the notch. The side baffle is hinged to the top surface of the second transverse groove. The guide groove has a smooth groove connected to one end near the drive device, and the smooth groove is connected to the second transverse groove.

2. The solar-powered screen printing apparatus according to claim 1, characterized in that: The guide plate is long and narrow with an arc-shaped cross-section. The lower side of the guide plate has a side notch, and the lower side of the guide plate is connected to the corresponding lower scraper. The upper side of the guide plate is connected to the corresponding vertical plate.

3. The solar-powered screen printing apparatus according to claim 1, characterized in that: The slurry tray is provided with a second groove, and the upper scraper is located in the second groove.

Images