Circuit board solder mask automatic screen printing machine and process

Abstract

The present application relates to the field of circuit board anti-solder screen printing, and particularly discloses a circuit board anti-solder automatic screen printing machine and process, which solves the problems of inconvenient positioning, poor universality and low processing efficiency of the existing circuit board anti-solder screen printing machine, and proposes the following scheme, which comprises a rack, a guide rail one, a sliding frame, a processing table plate, a guide rail two, a guide block two, an ink scraping module, a sliding way, a round hole, a sliding plate frame, a clamping plate, a triangular frame, a resisting top seat, a supporting plate, a cylinder, a tray, and a driving assembly, wherein the driving assembly is used to drive the sliding plate frame to slide or drive the supporting plate to slide upward, the supporting plate is provided with a steering assembly, the steering assembly is used to drive the circuit board supported on the tray to steer when the supporting plate moves upward, and the rack is further provided with a discharging assembly, which is used to discharge the circuit board after screen printing. The screen printing machine and process have the characteristics of high automation, high processing efficiency and precision, and universality.

Description

Technical Field

[0001] This invention relates to the field of solder resist screen printing on circuit boards, and in particular to an automatic solder resist screen printing machine and process for circuit boards. Background Technology

[0002] An automatic solder resist screen printing machine is a device used in the circuit board manufacturing process to automatically print solder resist ink. The principle is as follows: An automatic control system first accurately transports the circuit board to the printing position, and a positioning system ensures precise board placement. Then, a squeegee system applies pressure and speed to the screen, forcing the solder resist ink through the patterned areas of the screen and transferring it to the surface of the circuit board, completing the printing process. Finally, the printed circuit board is sent out of the printing area.

[0003] Existing automatic screen printing machines for circuit board solder resist generally consist of a screen frame, a squeegee system, a substrate positioning platform, an ink delivery system, an automatic control unit, loading and unloading devices, and a vision positioning system. However, after loading the circuit board, existing automatic screen printing machines still require manual placement and centering of the board, or the use of a special positioning mold to position the board for alignment with the squeegee system. Unloading also requires considerable manual operation. This reliance on manual labor in multiple stages limits processing efficiency, and the positioning process suffers from inconsistencies and errors due to manual placement. Therefore, this paper proposes an automatic screen printing machine and process for circuit board solder resist. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, this invention proposes an automatic screen printing machine and process for solder resist printing of circuit boards, which solves the problems of inconvenient positioning, poor versatility and inability to improve the processing efficiency of existing screen printing machines for solder resist printing of circuit boards.

[0005] To solve the above-mentioned technical problems, the basic technical solution proposed by this invention is as follows: An automatic screen printing machine for solder resisting circuit boards includes a frame, with a first guide rail parallel to the front and rear installed at the bottom of the frame, and a sliding frame slidably arranged between the first guide rails. A processing table is installed on the upper end of the sliding frame. A second guide rail is installed on the upper ends of both the front and rear sides of the frame, and a second guide block is slidably arranged inside the second guide rail. A scraper module is installed on the second guide block. Multiple slide rails are opened on the upper surface of the processing table, and a circular hole is also opened in the center of the upper surface of the processing table. Slide frames are symmetrically slidably arranged on the front and rear sides below the processing table. Clamping plates are slidably connected to the two slide frames on their respective sides, and the clamping plates slide through the slide rails. Triangular frames are also connected to the clamping plates. The lower end of the processing table is connected to a top seat that slides and abuts against the inclined surface of the triangular frame. A support plate is slidably disposed on the lower end surface of the processing table, and a cylinder is rotatably fitted inside the support plate. The upper end of the cylinder is connected to a tray inside a circular hole. A drive assembly is disposed on the sliding frame. The drive assembly is used to drive the sliding frame to slide or drive the support plate to slide upward. A steering assembly is disposed on the support plate. The steering assembly is used to drive the circuit board supported on the tray to turn when the support plate moves upward. A feeding assembly is also disposed on the frame. The feeding assembly is used to feed the circuit board after the screen printing is completed.

[0006] Preferably, the scraper module includes a device frame, a screen frame, and scrapers. The front and rear ends of the device frame are respectively connected to guide blocks two that slide within the front and rear guide rails two, which are close to each other at one end. The screen frame is installed below the device frame. Two scrapers are provided and slidably disposed within the device frame, and slide against the upper end of the screen frame. Guide strips are connected to both sides of the sliding frame, and the guide strips are slidably connected within the guide rails one.

[0007] Preferably, the lower end face of the processing table is connected to the front and rear sides of the slide rails, and the guide rods are located on the left and right sides of the slide rails, which are far apart from each other. The two ends of the guide rods are connected to the lower end face of the processing table. The two ends of the slide frame are slidably sleeved on the outer side of the guide rods on both sides. The ends of the slide frames on the front and rear sides that are close to each other are connected to the ends of the guide rods on their respective sides, and springs are sleeved on the outside of the guide rods.

[0008] Preferably, each of the processing table plates is connected to a slide rod seat one directly below the corresponding slide rail at one end, the lower end of the clamping plate is slidably sleeved on the outside of the slide rod seat one, and a spring two sleeved on the outside of the slide rod seat one is connected between the lower end of the clamping plate and the lower end of the slide rod seat one.

[0009] Preferably, guide rods 2 are connected to both the left and right sides of the lower end face of the processing table, and the two sides of the support plate are slidably sleeved on the outer side of the guide rods 2. A spring 3 sleeved on the outer side of the guide rods 2 is connected between the support plate and the lower end face of the processing table.

[0010] Preferably, the drive assembly includes a second slide rod seat, a sleeve, a first telescopic component, and a connecting plate. The second slide rod seat is connected to the lower end face of each slide frame. The sleeve is slidably fitted on the outer side of the second slide rod seat. The first telescopic component is installed on the lower inner wall of the slide frame. The connecting plate is connected to the output end of the first telescopic component. Rotating plates are rotatably connected between both ends of the connecting plate and the sleeves on both sides. The upper end face of the connecting plate abuts against the lower end face of the support plate.

[0011] Preferably, the steering assembly includes a worm gear, a worm, a ratchet, a guide rod three, a carriage, a limiting sleeve, and a ratchet. The worm gear is fitted onto the outer side of the cylinder. The worm is rotatably mounted on the upper end of the support plate and is located on one side of the worm gear, and is meshed with the worm gear. The ratchet is connected to both ends of the worm. The guide rod three is connected to both sides of the lower end face of the support plate. Two carriages are provided and are slidably fitted onto the outer sides of the guide rod three on both sides. A spring four fitted onto the outer side of the guide rod three is connected between the lower end of the carriage and the lower end face of the support plate. The limiting sleeve is connected to the carriage. One end of the ratchet is slidably connected to the limiting sleeve and connected to the inner wall of the limiting sleeve with a spring five, while the other end extends to the outer side of the limiting sleeve and meshes with the ratchet.

[0012] Preferably, the pallet is further connected to a positioning frame, and a ratchet block is slidably connected inside the positioning frame. One end of the ratchet block extends to the outside of the positioning frame and engages with a ratchet wheel. The end of the ratchet block inside the positioning frame is connected to the inner wall of the positioning frame by a spring.

[0013] Preferably, the feeding assembly includes a toggle block, a feeding slot, a vertical seat, a rotating shaft, a gear, a baffle, a slide block three, a slide, a rack, and a frame. Two toggle blocks are provided and connected to the front and rear guide blocks two, respectively, away from each other on one side. The feeding slot is opened on the left and right sides of the frame. The vertical seat is connected to the lower inner wall of the feeding slot. The rotating shaft is rotatably mounted on the upper end of the vertical seat. The gear is mounted on one end of the rotating shaft. The baffle is connected to the outside of the rotating shaft. The slide block three is connected to the vertical seat. The slide is slidably sleeved on the outside of the slide block three, and a spring seven sleeved on the outside of the slide block three is connected between the upper ends of the slide and the slide block three. The rack is connected to the slide and meshes with the gear on one side. The left and right ends of the frame are respectively connected to the upper ends of the left and right racks on the same side of the front and rear, and the frame is positioned above the toggle block. The upper surface of the toggle block abuts against the lower inner wall of the frame.

[0014] An automated screen printing process for solder resist on circuit boards includes the following steps: Step 1: Place the circuit board on the processing table near the edge of the frame, and then control the guide rail to move the sliding frame under the processing table until it slides directly under the ink scraping module. Step 2: Control the drive component to move the two side slide frames closer to each other. During the process, the triangular frame connected to the lower end of the clamping plate will disengage from the top seat and move up from the slide to the top of the processing table. The front and rear clamping plates will slide in their respective slides and move closer to each other, so as to clamp and place the circuit board on the processing table in a centered position. Finally, the clamping plates will be reset. Step 3: Control the drive component to move the pallet up, and move the pallet to lift the circuit board placed on the processing table to the top of the processing table. At the same time, make the steering component run, and drive the cylinder and pallet to rotate °. Then repeat the operation in step 2 to center the other two sides of the circuit board, so that the circuit board is centered in all directions. Step 4: Control guide rail 2 to drive guide block 2 to slide down, so that the squeegee module moves down, and then performs screen printing on the circuit board placed in the center. Then the squeegee module and the tray lift the processed circuit board to the top of the processing table, and the circuit board is unloaded by the unloading component. Step 5: Set the sliding frame and processing table into two groups, so that when one processing table is directly below the ink scraping module for Steps 2 to 4, the other processing table is on one side of the frame for Step 1.

[0015] The beneficial effects of this invention are: 1. The technical solution of the present invention drives two sliding frames in a group to slide to one side of the frame via a guide rail, so that one sliding frame slides to one side of the frame and then places the circuit board on its processing table. Then, the guide rail is controlled again to drive the sliding frame supporting the circuit board to slide below the ink scraper module, and then the other sliding frame slides to the other side of the frame. This makes it convenient to process the circuit board on the sliding frame directly below the ink scraper module while simultaneously loading the circuit board onto the other sliding frame. 2. The technical solution of this invention uses a drive assembly to pull the two side slide frames closer together, causing the clamping plates slidably connected at one end of the two slide frames to move closer together. This allows the triangular frame connected to the lower side of the clamping plate to gradually disengage from the abutting top seat. Simultaneously, the clamping plate can slide within the slide rail and rise above the processing table. As the two slide frames pull the two clamping plates closer together, the extended end of the clamping plate above the processing table clamps the circuit board placed on the processing table in one direction, centering it in a forward-backward direction. Then, the drive assembly is controlled to move the two clamping plates away from each other and reset them. Finally, the drive assembly... The moving component drives the pallet to move upward, and through the cylinder and tray, lifts the circuit board that has been centered on one side to the top of the processing table. At the same time, the turning component moves, causing the cylinder, tray, and circuit board to rotate 90°. Then, the above operation is performed, and the other side of the circuit board after rotating 90° is clamped by the clamping plate to center it from front to back, so that the circuit board is centered on both sides. This allows for precise vertical alignment of the ink scraping module, improving processing efficiency. At the same time, this automated centering clamping avoids manual labor, improves efficiency, reduces errors, and is also universal for circuit boards of different sizes. 3. The technical solution of the present invention, after the circuit board on the sliding frame below the doctor blade module and the processing table is processed, first controls the doctor blade module to move upward, and then the drive component drives the tray to move upward again, so as to move the processed circuit board on it to the top of the processing table again and rotate it 90° to the same direction as when it was feeding. Then, the sliding frame is controlled to move to the side of the frame. During the process, the unloading component drives the circuit board that has been lifted to the top of the processing table to be unloaded, realizing automated loading and unloading and centering clamping, which further improves the processing efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the frameless and guide rail structure of the present invention; Figure 3 This is a schematic diagram of the relevant structures on the sliding frame and the ink scraping module of the present invention; Figure 4 This is a schematic diagram of the relevant structures on the sliding frame of the present invention; Figure 5 This is a bottom view of the underside structure of the processing table of the present invention; Figure 6 This is a schematic diagram of the structure and drive components on the skateboard frame of the present invention; Figure 7 This is a bottom view of the structure and drive components on the skateboard frame of the present invention; Figure 8 This is a schematic diagram of the relevant structures and driving components on the pallet of the present invention; Figure 9 This is a side sectional view of the upper structure and drive assembly of the skateboard frame of the present invention; Figure 10 This is a schematic diagram of the material feeding assembly of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Frame; 2. Guide rail one; 3. Sliding frame; 4. Guide bar; 5. Processing table; 6. Guide rail two; 7. Guide block two; 8. Actuating block; 9. Slide rail; 10. Round hole; 11. Guide rod one; 12. Slide frame; 13. Spring one; 14. Slide rod seat one; 15. Clamping plate; 16. Spring two; 17. Triangular frame; 18. Abutting top seat; 19. Slide rod seat two; 20. Sleeve seat; 21. Telescopic component one; 22. Connecting plate; 23. Turning plate; 24. Guide rod two; 25. Support plate; 26. Spring three; 27. Round hole 28. Cylinder; 29. ​​Pallet; 30. Worm gear; 31. Worm; 32. Ratchet; 33. Guide rod three; 34. Slide; 35. Spring four; 36. Limiting sleeve; 37. Ratchet; 38. Spring five; 39. Positioning sleeve; 40. Ratchet block; 41. Discharge slot; 42. Vertical seat; 43. Rotating shaft; 44. Gear; 45. Baffle; 46. Slide rod seat three; 47. Slide; 48. Rack; 49. Spring seven; 50. Frame; 51. Equipment frame; 52. Wire mesh frame; 53. Scraper. Detailed Implementation

[0018] The following will be combined with the appendix Figure 1 To be continued Figure 10 The technical solutions in the embodiments of the present invention have been clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1:

[0020] like Figures 1-10 As shown, the present invention discloses an automatic screen printing machine for solder resisting of circuit boards, including a frame 1. The bottom of the frame 1 is equipped with a front-to-back parallel guide rail 2, and a sliding frame 3 is slidably arranged between the front and back guide rails 2. A processing table 5 is installed on the upper end of the sliding frame 3. A second guide rail 6 is installed on the upper ends of both the front and back sides of the frame 1. A second guide block 7 is slidably arranged in the second guide rail 6. A scraper module is installed on the second guide block 7. Multiple slide rails 9 are opened on the upper end surface of the processing table 5, and a round hole 10 is also opened in the center of the upper end surface of the processing table 5. A sliding plate frame 12 is symmetrically slidably arranged on the front and back sides below the processing table 5. A clamping plate 15 is slidably connected to one side of the two sliding plate frames 12, and the clamping plate 15 slides through the slide rails 9. A triangular frame 17 is also connected to the clamping plate 15. The lower end of the processing table 5 is connected to a top seat 18 that slides and abuts against the inclined surface of the triangular frame 17. A support plate 25 is slidably provided on the lower end surface of the processing table 5, and a cylinder 27 is rotatably fitted inside the support plate 25. The upper end of the cylinder 27 is connected to a tray 28 located in the circular hole 10. A drive assembly is provided on the sliding frame 3. The drive assembly is used to drive the sliding frame 12 to slide or drive the support plate 25 to slide upward. A steering assembly is provided on the support plate 25. The steering assembly is used to drive the circuit board supported on the tray 28 to turn when the support plate 25 moves upward. A feeding assembly is also provided on the frame 1. The feeding assembly is used to feed the circuit board after the screen printing of the circuit board is completed.

[0021] Both guide rail 12 and guide rail 26 adopt existing mature linear electric guide rails.

[0022] The scraper module includes a device frame 51, a screen frame 52, and a scraper 53. The front and rear ends of the device frame 51 are respectively connected to guide blocks 7 that slide within the guide rails 2 on the front and rear sides, which are close to each other at one end. The screen frame 52 is installed below the device frame 51. There are two scrapers 53, which are slidably installed within the device frame 51 and slide against the upper end of the screen frame 52. Guide strips 4 are connected to both sides of the sliding frame 3, and the guide strips 4 are slidably connected within the guide rails 2. The scraper module uses existing mature equipment.

[0023] The front and rear sides of the lower end of the processing table 5 are connected to guide rods 11 parallel to the slide rails 9. The guide rods 11 are located on the left and right sides of the slide rails 9, which are far apart from each other. The two ends of the guide rods 11 are connected to the lower end of the processing table 5. The two ends of the slide frame 12 are slidably sleeved on the outer side of the guide rods 11 on both sides. The front and rear slide frames 12 are close to each other and connected to the end of the guide rods 11 on their respective sides. Springs 13 are sleeved on the outside of the guide rods 11.

[0024] The sliding sleeves on both sides of the skateboard frame 12 on the guide rod 11 can stabilize the sliding of the skateboard frame 12. At the same time, the spring 13 can allow the two sides of the skateboard frame 12 to slide away from each other to the maximum distance without external force, until they are limited to the ends that are far away from each other from the guide rod 11.

[0025] Each of the processing table plates 5 is connected to a slide rod seat 14 directly below the slide rail 9 at one end of each other. The lower end of the clamping plate 15 is slidably sleeved on the outside of the slide rod seat 14, and a spring 16 sleeved on the outside of the slide rod seat 14 is connected between the lower end of the clamping plate 15 and the lower end of the slide rod seat 14.

[0026] This allows the clamping plate 15 to slide upwards towards the slide block seat 14 under the action of the second spring 16, until it extends through the slide rail 9 to the top of the processing table 5. At the same time, when the clamping plate 15 and the lower connected triangular frame 17 are driven to slide by the slide frame 12, and the triangular frame 17 comes into contact with the abutting top seat 18, the abutting top seat 18 will fit against the inclined surface of the triangular frame 17. The abutting triangular frame 17 pulls the clamping plate 15 to slide downwards until the clamping plate 15 slides into the slide rail 9 or below the processing table 5, so as to avoid affecting the circuit board when placing the circuit board on the processing table 5, and prevent the circuit board from being laid flat on the upper surface of the processing table 5.

[0027] Guide rods 24 are connected to both sides of the lower end face of the processing table 5. The two sides of the support plate 25 are slidably sleeved on the outer side of the guide rods 24. A spring 3 26 sleeved on the outside of the guide rods 24 is connected between the support plate 25 and the lower end face of the processing table 5.

[0028] The sliding sleeve between the support plate 25 and the guide rod 24 makes the support plate 25 more stable when sliding up and down. The setting of the spring 3 26 allows the support plate 25 to move down to the bottom of the guide rod 24 under the action of the elastic force of the spring 3 26 and its own weight without the action of external force.

[0029] Example 2:

[0030] like Figures 1-10 As shown, the present invention discloses an automatic screen printing machine for solder resist on circuit boards. Compared with Embodiment 1, this embodiment discloses the structure of the driving component.

[0031] The drive assembly includes a second slide rod seat 19, a sleeve 20, a telescopic component 21, and a connecting plate 22. The second slide rod seat 19 is connected to the lower end face of each slide frame 12. The sleeve 20 is slidably fitted on the outside of the second slide rod seat 19. The telescopic component 21 is installed on the lower inner wall of the slide frame 3. The connecting plate 22 is connected to the output end of the telescopic component 21. Both ends of the connecting plate 22 are rotatably connected to the sleeves 20 on both sides. The upper end face of the connecting plate 22 abuts against the lower end face of the support plate 25.

[0032] When the telescopic components 21 on both sides retract, the connecting plate 22 can be moved down. At this time, it does not affect the support plate 25, but it will pull the rotating plates 23 on both sides to move the sleeves 20 on both sides closer to each other until the sleeves 20 on both sides are close to each other until the sliding rod seats 19 on both sides of the slide frame 12 are close to each other. Then, the slide frames 12 on both sides can be moved closer to each other, which in turn can move the front and rear clamping plates 15 closer to each other. When the front and rear clamping plates 15 are close to each other, they can move up to the top of the processing table 5 after the triangular frame 17 and the abutting top seat 18 are no longer in contact, so as to facilitate the centered clamping and placement of the circuit boards placed on the processing table 5.

[0033] When the telescopic component 21 extends, the two side slide frames 12 will move away from each other under the action of the spring 13, causing the triangular frame 17 to abut against the top seat 18, which will drive the clamping plate 15 to move down into the slide 9 or below the processing table 5. Then, as the connecting plate 22 continues to rise, it will abut against the lower end of the support plate 25, which will drive the support plate 25, cylinder 27, and tray 28 to move up, thereby driving the tray 28 to lift the circuit board placed on the processing table 5 and move it above the processing table 5. During the process, the rotating plate 23 will also drive the two side sleeves 20 to slide away from each other on their respective slide rod seats 19.

[0034] Example 3:

[0035] like Figures 1-10 As shown, the present invention discloses an automatic screen printing machine for solder resist on circuit boards. Compared with Embodiment 2, this embodiment discloses the structure of the steering assembly.

[0036] The steering assembly includes a worm gear 29, a worm 30, a ratchet 31, a guide rod 32, a carriage 33, a limiting sleeve 35, and a ratchet 36. The worm gear 29 is fitted onto the outer side of the cylinder 27. The worm 30 is rotatably mounted on the upper end of the support plate 25 and is located on one side of the worm gear 29, and is meshed with the worm gear 29. The ratchet 31 is connected to both ends of the worm 30. The guide rod 32 is connected to both sides of the lower end face of the support plate 25. There are two carriages 33, which are slidably fitted onto the outer side of the guide rod 32 on both sides. A spring 4 34 fitted onto the outer side of the guide rod 32 is connected between the lower end of the carriage 33 and the lower end face of the support plate 25. The limiting sleeve 35 is connected to the carriage 33. One end of the ratchet 36 is slidably connected to the limiting sleeve 35 and connected to the inner wall of the limiting sleeve 35 by a spring 5 37. The other end extends to the outer side of the limiting sleeve 35 and meshes with the ratchet 31.

[0037] When the tray 25 is pushed by the connecting plate 22, causing the circuit board to move upward to above the processing table 5, the slide 33 will abut against the lower end face of the processing table 5 and slide downward relative to the guide rod 32, compressing the spring 4 34. This will cause the limiting sleeve 35 and the ratchet 36 to slide downward, so that the ratchet 36 drives the worm 30 to rotate through the meshing with the ratchet 31. Through the meshing of the worm 30 and the worm wheel 29, the cylinder 27, the tray 28, and the circuit board raised on the tray 28 will rotate synchronously by 90°. Then, the telescopic component 21 is controlled to retract, causing the slide 33 to fall back to its original position. However, during the fall, the ratchet 36 will be limited by the ratchet 31 and squeezed into the limiting sleeve 35, compressing the spring 5 37. This ensures that after the tray 28 and the circuit board are rotated by 90°, and then reset, the rotation angle will not follow the reset.

[0038] The pallet 25 is also connected to a positioning sleeve 38. A ratchet block 39 is slidably connected inside the positioning sleeve 38. One end of the ratchet block 39 extends to the outside of the positioning sleeve 38 and engages with the ratchet wheel 31. A spring 40 is connected to the inner wall of the positioning sleeve 38 at one end of the ratchet block 39 inside the positioning sleeve 38.

[0039] The engagement of the ratchet block 39 and the ratchet wheel 31 can prevent the ratchet wheel 31 from being restricted when the ratchet bar 36 moves upward to drive the ratchet wheel 31 to rotate. However, when the ratchet bar 36 moves downward, it can lock the ratchet wheel 31, further ensuring the stability of the ratchet wheel 31 and the worm gear 30 when the slide 33 is reset, and ensuring the stability of the circuit board after it rotates 90°.

[0040] During actual processing, the guide rail 2 drives two sliding frames 3 to slide to one side of the frame 1, so that one sliding frame 3 slides to one side of the frame 1 and then places the circuit board on its processing table 5. Then, the guide rail 2 is controlled again to drive the sliding frame 3 supporting the circuit board to slide below the ink scraper module, and then the other sliding frame 3 slides to the other side of the frame 1. This makes it convenient to process the circuit board on the sliding frame 3 directly below the ink scraper module while simultaneously loading the circuit board on the other sliding frame 3. The drive assembly pulls the two sliding frames 12 closer together, causing the clamping plates 15 slidably connected at one end of the two sliding frames 12 to move closer together. This causes the triangular frame 17 connected to the lower side of the clamping plate 15 to gradually disengage from the top seat 18, allowing the clamping plate 15 to slide within the slide rail 9 and simultaneously rise above the processing table 5. As the two sliding frames 12 bring the two clamping plates 15 closer together, the extended ends of the clamping plates 15 above the processing table 5 simultaneously clamp the circuit board placed on the processing table 5 in a directional, front-to-back centered manner. Then, the drive assembly is controlled to move the two clamping plates 15 away from each other and reset them. The drive assembly moves the tray 25 upward, and through the cylinder 27 and the pallet 28, lifts the circuit board, which has been centered on one side, to the top of the processing table 5. At the same time, the steering assembly operates, causing the cylinder 27, the pallet 28, and the circuit board to rotate 90°. Then, the above operation is performed, and the clamping plate 15 clamps the other side of the circuit board after it has rotated 90°, centering it from front to back. This ensures that the circuit board is centered on both sides, allowing for precise vertical alignment of the ink scraping module and improving processing efficiency. This automated centering clamping not only avoids manual labor, improves efficiency, and reduces errors, but also provides versatility for circuit boards of different sizes.

[0041] Example 4:

[0042] like Figures 1-10 As shown, the present invention discloses an automatic screen printing machine for solder resist on circuit boards. Compared with Embodiment 3, this embodiment discloses the structure of the feeding assembly.

[0043] The feeding assembly includes a toggle block 8, a feeding slot 41, a vertical seat 42, a rotating shaft 43, a gear 44, a baffle 45, a slide block 46, a slide 47, a rack 48, and a frame 50. Two toggle blocks 8 are provided and connected to the front and rear guide blocks 7, respectively, away from each other. The feeding slot 41 is located on the left and right sides of the frame 1. The vertical seat 42 is connected to the lower inner wall of the feeding slot 41. The rotating shaft 43 is rotatably mounted on the upper end of the vertical seat 42. The gear 44 is mounted on one end of the rotating shaft 43. The baffle 45 is connected to the rotating shaft 46. 3. On the outside, slide block 3 46 is connected to vertical seat 42, slide block 47 is slidably sleeved on the outside of slide block 3 46, and spring 7 49 sleeved on the outside of slide block 3 46 is connected between slide block 47 and the upper end of slide block 3 46. Rack 48 is connected to slide block 47 and meshes with gear 44 on its respective side. The left and right ends of frame 50 are respectively connected to the upper ends of the left and right racks 48 on the same side at the front and rear, and frame 50 is above toggle block 8. The upper end face of toggle block 8 is in contact with the lower inner wall of frame 50.

[0044] After processing the circuit boards on the sliding frame 3 below the scraper module and the processing table 5, the scraper module is first moved upward. During this process, the guide block 7 will drive the connecting block 8 to move upward, thereby pushing the frame 50 upward and pulling the racks 48 and slides 47 on both sides upward. At the same time, the spring 7 49 is compressed, and the rack 48 will drive the rotating shaft 43 and the baffle 45 to rotate 90° through its meshing with the gear 44. This causes the originally vertical baffle 45 to rotate to a horizontal state parallel to the processing table 5. Then, the drive assembly drives the tray 28 to move upward again, so as to drive the processing on it. The completed circuit board is moved back to the processing table 5 and rotated 90° to the same direction as when it was fed. Then, the sliding frame 3 is controlled to move to the side of the frame 1. During the process, the completed circuit board raised above the processing table 5 will come into contact with the baffle 45 and slide down between the two processing tables 5. In this way, a conveyor belt can be arranged in the unloading slots 41 on both sides to receive and transport the unloaded completed circuit board. The board can also be loaded directly onto the processing table 5 by the conveyor belt, realizing automated loading and unloading and centering clamping, which further improves the processing efficiency.

[0045] Example 5:

[0046] like Figures 1-10 As shown, this invention discloses an automatic screen printing process for solder mask on circuit boards, comprising the following steps: Step 1: Place the circuit board on the processing table 5 near the edge of the frame 1, and then control the guide rail 2 to drive the sliding frame 3 under the processing table 5 to slide until it slides directly under the ink scraping module. Step 2: Control the drive component to move the two side slide frames 12 closer to each other. During the process, the triangular frame 17 connected to the lower end of the clamping plate 15 will disengage from the contact top seat 18 and move up from the slide 9 to the top of the processing table 5. The clamping plates 15 on the front and rear sides will slide in their respective slides 9 and move closer to each other, so as to clamp and place the circuit board placed on the processing table 5 in a centered position. Finally, the clamping plate 15 will be reset. Step 3: Control the drive component to move the tray 25 upward and drive the pallet 28 to lift the circuit board placed on the processing table 5 to above the processing table 5. At the same time, make the steering component run, drive the cylinder 27 and the pallet 28 to rotate 90°. Then repeat the operation in step 2 to center the other two sides of the circuit board, so that the circuit board is centered in all directions. Step 4: Control guide rail 26 to drive guide block 27 to slide down, so that the squeegee module moves down and then performs screen printing on the circuit board placed in the center. Then the squeegee module and tray 28 lift the processed circuit board to the processing table 5 and unload the circuit board through the unloading component. Step 5: Set the sliding frame 3 and the processing table 5 into two groups, so that when one processing table 5 is directly below the ink scraping module to perform Step 2 to Step 4, the other processing table 5 is on one side of the frame 1 to perform Step 1.

[0047] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. An automatic screen printing machine for solder resisting circuit boards, comprising a frame (1), a first guide rail (2) with parallel front and rear sides installed at the bottom of the frame (1), and a sliding frame (3) slidably arranged between the front and rear guide rails (2), a processing table (5) installed at the upper end of the sliding frame (3), a second guide rail (6) installed at the upper ends of both the front and rear sides of the frame (1), a second guide block (7) slidably arranged inside the second guide rail (6), and a scraper module installed on the second guide block (7), characterized in that, The upper surface of the processing table (5) is provided with multiple slides (9), and the center of the upper surface of the processing table (5) is also provided with a round hole (10). The processing table (5) is symmetrically provided with sliding frames (12) on the front and back sides below. The two sides of the sliding frames (12) are also slidably connected with clamps (15) close to each other, and the clamps (15) slide through the slides (9). The clamps (15) are also connected with triangular frames (17). The lower end of the processing table (5) is connected to an abutment top seat (18) that slides against the inclined surface of the triangular frame (17). A support plate (25) is slidably provided on the lower end surface of the processing table (5), and a cylinder (27) is rotatably fitted inside the support plate (25). The upper end of the cylinder (27) is connected to a tray (28) located in the circular hole (10). A drive assembly is provided on the sliding frame (3). The drive assembly is used to drive the sliding frame (12) to slide or drive the support plate (25) to slide upward. A steering assembly is provided on the support plate (25). The steering assembly is used to drive the circuit board supported on the tray (28) to turn when the support plate (25) moves upward. A feeding assembly is also provided on the frame (1). The feeding assembly is used to feed the circuit board after the screen printing of the circuit board is completed. The drive assembly includes a second slide block seat (19), a sleeve seat (20), a telescopic component (21), and a connecting plate (22). The second slide block seat (19) is connected to the lower end face of each slide frame (12). The sleeve seat (20) is slidably sleeved on the outside of the second slide block seat (19). The telescopic component (21) is installed on the lower inner wall of the slide frame (3). The connecting plate (22) is connected to the output end of the telescopic component (21). The two ends of the connecting plate (22) are rotatably connected to the sleeve seats (20) on both sides. The upper end face of the connecting plate (22) is in contact with the lower end face of the support plate (25). The steering assembly includes a worm gear (29), a worm (30), a ratchet (31), a guide rod (32), a carriage (33), a limiting sleeve (35), and a ratchet (36). The worm gear (29) is fitted onto the outer side of the cylinder (27). The worm (30) is rotatably mounted on the upper end of the support plate (25) and is located on one side of the worm gear (29), and is meshed with the worm gear (29). The ratchet (31) is connected to both ends of the worm (30). The guide rod (32) is connected to both sides of the lower end face of the support plate (25). The carriage (36) 3) Two sets are provided, and they are respectively slidably sleeved on the outside of the guide rod three (32) on both sides. The lower end of the slide (33) and the lower end face of the support plate (25) are connected by a spring four (34) sleeved on the outside of the guide rod three (32). The limiting sleeve frame (35) is connected to the slide (33). One end of the ratchet (36) is slidably connected to the limiting sleeve frame (35) and a spring five (37) is connected between it and the inner wall of the limiting sleeve frame (35). The other end extends to the outside of the limiting sleeve frame (35) and meshes with the ratchet (31). The feeding assembly includes a toggle block (8), a feeding slot (41), a vertical seat (42), a rotating shaft (43), a gear (44), a baffle (45), a slide block (46), a slide (47), a rack (48), and a frame (50). Two toggle blocks (8) are provided and connected to guide blocks (7) on the front and rear sides, respectively, away from each other. The feeding slot (41) is located on the left and right sides of the frame (1). The vertical seat (42) is connected to the lower inner wall of the feeding slot (41). The rotating shaft (43) is rotatably mounted on the upper end of the vertical seat (42). The gear (44) is mounted on one end of the rotating shaft (43). The baffle (45) is connected to... Connected to the outside of the rotating shaft (43), the slide seat three (46) is connected to the vertical seat (42), the slide seat (47) is slidably sleeved on the outside of the slide seat three (46), and a spring seven (49) sleeved on the outside of the slide seat three (46) is connected between the upper end of the slide seat (47) and the slide seat three (46). The rack (48) is connected to the slide seat (47) and meshes with the gear (44) on its respective side. The left and right ends of the frame (50) are respectively connected to the upper ends of the left and right racks (48) on the same side at the front and back, and the frame (50) is above the actuating block (8). The upper end face of the actuating block (8) is in contact with the lower inner wall of the frame (50).

2. The automatic screen printing machine for solder resist printing on circuit boards according to claim 1, characterized in that, The scraper module includes a device frame (51), a screen frame (52), and a scraper (53). The front and rear ends of the device frame (51) are respectively connected to guide blocks (7) that slide in the front and rear guide rails (6) and are close to each other. The screen frame (52) is installed below the device frame (51). There are two scrapers (53) that are slidably installed in the device frame (51) and slide against the upper end of the screen frame (52). Guide strips (4) are connected to both sides of the sliding frame (3), and the guide strips (4) are slidably connected in the guide rail (2).

3. The automatic screen printing machine for solder resist printing on circuit boards according to claim 1, characterized in that, The processing table (5) has guide rods (11) connected to the front and rear sides of the lower end face, which are parallel to the slide rails (9). The guide rods (11) are located on the left and right sides of the slide rails (9) and are far apart from each other. The two ends of the guide rods (11) are connected to the lower end face of the processing table (5). The two ends of the slide frame (12) are slidably sleeved on the outer side of the guide rods (11) on both sides. The two sides of the slide frame (12) are close to each other and connected to the end of the guide rods (11) on their respective sides. Springs (13) are sleeved on the outside of the guide rods (11).

4. The automatic screen printing machine for solder resist printing on circuit boards according to claim 1, characterized in that, Each of the processing table plates (5) is connected to a slide rod seat (14) directly below the corresponding slide rail (9) at one end. The lower end of the clamping plate (15) is slidably sleeved on the outside of the slide rod seat (14), and a spring (16) sleeved on the outside of the slide rod seat (14) is connected between the lower end of the clamping plate (15) and the lower end of the slide rod seat (14).

5. The automatic screen printing machine for solder resist printing on circuit boards according to claim 1, characterized in that, The lower end face of the processing table (5) is connected to the left and right sides of the guide rod two (24), and the two sides of the support plate (25) are slidably sleeved on the outer side of the guide rod two (24). The support plate (25) and the lower end face of the processing table (5) are connected by the spring three (26) sleeved on the outside of the guide rod two (24).

6. The automatic screen printing machine for solder resist printing on circuit boards according to claim 1, characterized in that, The pallet (25) is also connected to a positioning sleeve (38), and a ratchet block (39) is slidably connected inside the positioning sleeve (38). One end of the ratchet block (39) extends to the outside of the positioning sleeve (38) and engages with the ratchet wheel (31). A spring six (40) is connected between the end of the ratchet block (39) inside the positioning sleeve (38) and the inner wall of the positioning sleeve (38).

7. An automatic screen printing process for solder resist on circuit boards, based on an automatic screen printing machine for solder resist on circuit boards according to any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Place the circuit board on the processing table (5) near the edge of the frame (1), and then control the guide rail (2) to drive the sliding frame (3) under the processing table (5) to slide until it slides directly under the ink scraping module. Step 2: Control the drive component to move the two side slide frames (12) closer to each other. During the process, the triangular frame (17) connected to the lower end of the clamping plate (15) will disengage from the top seat (18) and move up from the slide (9) to the top of the processing table (5). The clamping plates (15) on the front and back sides will slide in their respective slides (9) and move closer to each other, so as to clamp and place the circuit board placed on the processing table (5) in the center from front to back. Finally, the clamping plate (15) will be reset. Step 3: Control the drive component to move the tray (25) upward and drive the pallet (28) to lift the circuit board placed on the processing table (5) above the processing table (5). At the same time, make the steering component run, drive the cylinder (27) and the pallet (28) to rotate 90°. Then repeat the operation in step 2 to center the other two sides of the circuit board, so that the circuit board is centered in all directions. Step 4: Control the guide rail 2 (6) to drive the guide block 2 (7) to slide down, so that the squeegee module moves down, and then performs screen printing on the circuit board placed in the center. Then control the squeegee module to move up. During the process, the guide block 2 (7) will drive the toggle block (8) connected to it to move up, so as to push the frame (50) to move up, and pull the racks (48) and slides (47) on both sides to move up. At the same time, the spring 7 (49) is compressed. Then the rack (48) will drive the rotating shaft (43) and the baffle (45) to rotate 90° through its meshing with the gear (44). This causes the originally vertical baffle (45) to rotate to a horizontal state parallel to the processing table (5). Then, the drive assembly drives the tray (28) to move upward again, so that the processed circuit board on it can move to the top of the processing table (5) again and rotate 90° in the same direction as when feeding. Then, the sliding frame (3) is controlled to move to the side of the frame (1). During the process, the processed circuit board raised to the top of the processing table (5) will come into contact with the baffle (45) and slide down between the two processing tables (5) to realize the unloading of the circuit board. Step 5: Set the sliding frame (3) and the processing table (5) into two groups, so that when one processing table (5) is directly below the ink scraping module to perform Step 2 to Step 4, the other processing table (5) is on one side of the frame (1) to perform Step 1.

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