SMT printing machine

Abstract

The invention relates to the technical field of electronic assembly production, and discloses an SMT printing machine which comprises a solder paste steel mesh and a discharging plate which are arranged in a printing machine body, the discharging plate is located under the solder paste steel mesh, a guide rail is arranged on the inner top of the printing machine body in the direction parallel to the length direction of the printing machine body, and the guide rail is slidably sleeved with a moving block; a tin storage box is arranged at the bottom of the moving block in a lifting mode, a rolling brush is rotationally arranged at the bottom of the tin storage box in the length direction of the tin storage box, a scraping plate is connected to the side wall, away from the paint trend, of the tin storage box, a tin injection opening is formed in the top wall of one end of the tin storage box, and a stirring assembly and a heating piece are arranged in the tin storage box; the stirring assembly comprises a magnetic stirrer and a magnetic stirrer, the magnetic stirrer is installed on the top of the tin storage box, and the magnetic stirrer is placed in the tin storage box and is attracted to the inner top wall of the tin storage box through the magnetic attraction effect of the magnetic stirrer. The device has the effects of keeping the continuous flowability of the solder paste in the storage frame and improving the printing quality.

Description

Technical Field

[0001] The present application relates to the technical field of electronic assembly production, and in particular to an SMT printer. Background Art

[0002] With the continuous development of science and technology, the importance of electronic products in people's lives is increasing. As a common electronic manufacturing technology, SMT is widely used in the production process of various electronic products. SMT printer is one of the key equipment of SMT patch technology, which is mainly used to accurately apply solder paste to the pads of the circuit board to ensure the reliable welding of subsequent components.

[0003] Traditional SMT solder paste printers usually consist of mechanisms such as plate loading, solder paste adding, stamping, and circuit board conveying. The solder paste is printed on the circuit board through the steel mesh by a printing scraper, thereby achieving fine soldering preparation. However, there are some technical bottlenecks in the actual application of traditional SMT solder paste printers, which limits their further development and application.

[0004] Although the SMT solder paste printers currently on the market can meet the production needs of electronic products to a certain extent, there is still a lot of room for improvement. The Chinese patent with announcement number CN218735268U discloses an SMT solder paste printer, which uses a first elastic member to drive the anti-blocking ball to move downward to prevent the solidified solder paste from clogging the feed hole, thereby ensuring the smooth flow of the solder paste. In addition, the technology also drives the screw to rotate by turning the handwheel, and the screw drives the scraper plate to move left and right, which can effectively remove excess solder paste on the brush plate and prevent the solder paste from solidifying on the brush plate. Finally, the second elastic member drives the circular card block downward into the card hole, thereby fixing the collection frame to prevent the collection frame from shifting during work.

[0005] Although the above printer can effectively clean the excess solder paste on the steel mesh, it still does not manage the fluidity of the solder paste in the storage frame. Since the solder paste is easily solidified when it is left in the storage frame for a long time, it will not only affect the normal discharge of the solder paste, but also lead to a decline in printing quality and even cause equipment failure. Summary of the invention

[0006] In order to maintain the continuous fluidity of solder paste in a storage frame and improve printing quality, the present application provides an SMT printer.

[0007] The present application provides an SMT printer that adopts the following technical solution: A SMT printer comprises a printer body, wherein a solder paste steel mesh and a material discharge plate are arranged in the printer body, wherein the material discharge plate is located directly below the solder paste steel mesh, wherein a guide rail is arranged on the inner top of the printer body parallel to the length direction thereof, wherein a moving block is slidably sleeved on the guide rail, wherein a tin storage box is arranged at the bottom of the moving block for lifting and lowering, wherein a rolling brush is arranged at the bottom of the tin storage box for rotating along the length direction thereof, and a scraper plate is connected to the side wall of the tin storage box which is away from the direction of the coating, wherein a tin injection port is arranged on the top wall at one end of the tin storage box, wherein a stirring assembly and a heating element are arranged in the tin storage box, wherein the stirring assembly comprises a magnetic stirrer and a magnetic stirring bar, wherein the magnetic stirrer is installed on the top of the tin storage box, wherein the magnetic stirring bar is placed in the tin storage box and adsorbed on the inner top wall of the tin storage box by the magnetic attraction of the magnetic stirrer.

[0008] By adopting the above technical solution, before the printer works, the staff injects the solder paste into the tin storage box from the tin injection port, and drives the magnetic stirrer to rotate under the action of the magnetic stirrer and the heating element to maintain the uniformity and fluidity of the solder paste. Then install the solder paste steel mesh that matches the specifications of the PCB board to be printed, and then accurately place the PCB board on the discharge plate by docking the solder paste steel mesh. When the printer is working, under the guidance and drive of the guide rail, the moving block drives the roller brush on the tin storage box to evenly coat the solder paste steel mesh with solder paste. The scraper plate connected to the rear side of the tin storage box closely follows the moving trajectory of the roller brush and scrapes the solder paste into the feed hole of the solder paste steel mesh until the solder paste leaks through the steel mesh and is printed on the PCB board, achieving fine welding preparation. The magnetic stirrer installed inside the tin storage box can effectively stir the solder paste in the tin storage box under the action of the magnetic stirrer, preventing the solder paste from solidifying or stratifying during the storage process, thereby improving the uniformity and fluidity of the solder paste. At the same time, the setting of the heating element can maintain the appropriate temperature of the solder paste in the tin storage box, further improving the printing quality and avoiding the change of solder paste viscosity caused by temperature problems that affects the printing effect.

[0009] Optionally, the heating element includes an electric heating rod and an end cover sleeved on the electric heating rod, the electric heating rod is plugged into the tin storage box from the tin injection port, and the end cover is sleeved on the tin injection port by threaded rotation.

[0010] By adopting the above technical solution, the electric heating rod can be inserted into the tin storage box from the tin injection port, which can effectively heat the solder paste in the tin storage box to prevent the solder paste from solidifying, thereby maintaining the fluidity of the solder paste and improving the printing quality. It is fixed by the end cover, and the end cover is screwed on the tin injection port by threads, which not only improves the stability of the installation of the electric heating rod, but also avoids the damage of the tin storage box caused by additional drilling of the tin storage box.

[0011] Optionally, a support plate frame is provided in the printer body, a circle of overlapping grooves is opened on the top of the inner wall of the support plate frame, a heating gasket is provided in the overlapping groove, and the peripheral bottom wall of the solder paste steel mesh is overlapped on the heating gasket and plugged into the overlapping groove.

[0012] By adopting the above technical solution, the overlap groove opened at the top of the inner wall of the support plate frame has a built-in heating gasket, which can ensure that the bottom wall around the solder paste steel mesh is always in a heated state, reducing the occurrence of solder paste solidification on the steel mesh, thereby improving printing accuracy. In addition, the notch opened on the support plate frame facilitates the quick removal of the solder paste steel mesh, simplifying the operation process of replacing the solder paste steel mesh.

[0013] Optionally, the guide rail includes a guide rod and a screw rod arranged in parallel, the moving block is slidably sleeved on the guide rod and rotatably sleeved on the screw rod through a thread, and a servo motor is arranged on the outer side wall of the printing machine body, and the servo motor drives the screw rod to rotate.

[0014] By adopting the above technical solution, when it is necessary to drive the tin storage box to uniformly coat the solder paste on the solder paste steel mesh, the tin storage box is lowered until the roller brush is pressed against the surface of the solder paste steel mesh until the solder paste overflows onto the mesh surface of the solder paste steel mesh following the rotation of the roller brush. The servo motor drives the screw to rotate, and the moving block that cooperates with the screw through threaded rotation realizes translation under the limiting guidance of the guide rod, thereby improving the movement stability and positioning accuracy of the tin storage box, thereby improving the uniformity and accuracy of solder paste coating during printing.

[0015] Optionally, a driving block is provided on the side of the scraper plate away from the tin storage box for sliding along the length direction of the guide rod, and an anti-blocking plate is provided at the bottom of the driving block for lifting and lowering. The guide rail also includes a rotatable lead screw, which is located on the side of the guide rod away from the screw rod and is arranged parallel to the guide rod. The driving block is slidably sleeved on the guide rod and rotatably sleeved on the lead screw through a thread, and the servo motor drives the lead screw to rotate.

[0016] By adopting the above technical solution, after the staff takes out the printed PCB board, the anti-blocking plate at the bottom of the driving block is lowered to fit with the solder paste steel mesh, and under the limit guidance of the guide rod, the servo motor drives the lead screw to rotate, so that the anti-blocking plate moves smoothly, thereby utilizing the translational anti-blocking plate to effectively clear the feed hole of the solder paste steel mesh, further improving the printing quality of subsequent PCB boards.

[0017] Optionally, an L-shaped support seat is rotatably provided on the outer side wall of the printing machine body, the servo motor is arranged on the support seat, the screw and the lead screw extend out of the printing machine body near the end of the servo motor, a worm is coaxially provided on the output shaft of the servo motor, the worm is located between the screw and the lead screw, and the screw and the lead screw are both provided with worm wheels which are meshed with the worm.

[0018] By adopting the above technical solution, when it is necessary to drive the tin storage box to evenly coat the solder paste steel mesh with solder paste, the support seat is rotated until the worm on the output end of the servo motor is meshed with the worm wheel on the screw. At this time, the servo motor is working, and the rotation of its output shaft drives the screw to rotate, thereby realizing the translation of the tin storage box; when the anti-blocking plate is needed to clear the feeding hole of the solder paste steel mesh, the support seat is rotated until the worm on the output end of the servo motor is meshed with the worm wheel on the screw. At this time, the servo motor is working, and the rotation of its output shaft drives the screw to rotate, thereby realizing the translation of the anti-blocking plate.

[0019] Optionally, a plurality of anti-blocking balls are equidistantly distributed at the bottom of the anti-blocking plate along its length direction, a guide groove is vertically opened at the inner bottom of the anti-blocking plate corresponding to each anti-blocking ball, and each guide groove is provided with an elastic member, the elastic member connects the anti-blocking ball and the inner top wall of the guide groove, a blanking box is provided at the bottom of the solder paste steel mesh, and a connecting plate is connected between the blanking box and the side wall of the solder paste steel mesh extending from the same side of the anti-blocking plate.

[0020] By adopting the above technical solution, during the movement of the anti-blocking plate, the anti-blocking ball on the anti-blocking plate is squeezed by the solder paste steel mesh, causing the corresponding elastic part to deform until the anti-blocking ball is aligned with the feed hole. The elastic part drives the anti-blocking ball to reset downward, and the anti-blocking ball can clear the feed hole to reduce the solidified solder paste from blocking the feed hole. When the anti-blocking plate continues to move, the solder paste steel mesh squeezes the anti-blocking ball to move upward again, and the elastic part is deformed again, and the anti-blocking ball is separated from the feed hole, and this process is repeated until the feed hole of the entire solder paste steel is cleared. The anti-blocking ball moves up and down in the guide groove, which can effectively clean the inside of the blanking box, avoid blockage by solidified solder paste, and further improve solder paste fluidity and printing quality.

[0021] Optionally, a discharge port is provided on the end of the printing machine body along the direction of the coating, a recovery box is provided below the discharge port, and a guide ramp extending into the recovery box is provided at the discharge port, the blanking box and the connecting plate are rotatably connected by a torsion spring, and a roller is provided on the top wall of the blanking box to rotate toward the guide ramp on one side, when the blanking box slides toward the recovery box until the roller hits the guide ramp, the blanking box tilts toward the recovery box until the solder paste liquid collected in the blanking box is transferred to the recovery box.

[0022] By adopting the above technical solution, the excess solder paste liquid in the blanking box can be conveniently and automatically transferred to the recovery box, reducing the number of manual interventions and improving work efficiency. At the same time, through the cooperation of the roller and the guide ramp, the stability and reliability of the solder paste liquid transfer process are ensured, reducing the possibility of solder paste waste.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. Before the printer starts working, the staff will inject the solder paste into the tin storage box from the tin injection port, and drive the magnetic stirrer to rotate under the action of the magnetic stirrer and the heating element to maintain the uniformity and fluidity of the solder paste. Then install the solder paste steel mesh that matches the specifications of the PCB board to be printed, and then accurately place the PCB board on the discharge plate by docking the solder paste steel mesh. When the printer is working, under the guidance of the guide rail, the moving block drives the roller brush on the tin storage box to evenly coat the solder paste steel mesh with solder paste. The scraper plate connected to the back of the tin storage box follows the moving trajectory of the roller brush and scrapes the solder paste into the feeding hole of the solder paste steel mesh until the solder paste leaks through the steel mesh and is printed on the PCB board, achieving fine welding preparation. The magnetic stirrer installed inside the tin storage box can effectively stir the solder paste in the tin storage box under the action of the magnetic stirrer to prevent the solder paste from solidifying or stratifying during the storage process, thereby improving the uniformity and fluidity of the solder paste. At the same time, the setting of the heating element can maintain the appropriate temperature of the solder paste in the tin storage box, further improve the printing quality, and avoid the change of solder paste viscosity caused by temperature problems affecting the printing effect. 2. The electric heating rod can be inserted into the tin storage box from the tin injection port, which can effectively heat the solder paste in the tin storage box to prevent the solder paste from solidifying, thereby maintaining the fluidity of the solder paste and improving the printing quality. It is fixed by the end cover, which is screwed on the tin injection port through threads, which not only improves the stability of the electric heating rod installation, but also avoids the damage of the tin storage box caused by additional drilling of the tin storage box; 3. The overlap groove on the top of the inner wall of the support frame has a built-in heating gasket, which can ensure that the bottom wall around the solder paste stencil is always heated, reducing the occurrence of solder paste solidification on the stencil, thereby improving printing accuracy. The notch on the support frame is convenient for quick removal of the solder paste stencil, simplifying the operation process of replacing the solder paste stencil. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0025] Figure 2 It is a cross-sectional view showing the internal structure of the tin storage box in the embodiment of the present application.

[0026] Figure 3 It is a schematic diagram showing the connection relationship between the screw, guide rod, lead screw, drive block and moving block in the embodiment of the present application.

[0027] Figure 4 It is a cross-sectional view showing the connection relationship between the anti-blocking ball, the elastic member and the anti-blocking plate in the embodiment of the present application.

[0028] Description of reference numerals: 1. Printing machine body; 11. Machine cover; 111. Visual window; 12. Solder paste steel mesh; 13. Feed plate; 14. Support plate frame; 141. Overlap groove; 1411. Heating gasket; 15. Electric turntable; 151. Support seat; 16. Feed outlet; 161. Feed guide ramp; 2. Guide rail; 21. Guide rod; 22. Screw; 23. Lead screw; 3. Moving block; 31. Cylinder; 4. Tin storage box; 41. Tin injection port; 42. Roller brush; 43. Hook plate; 44. Scraper plate; 44 1. Scraper body; 442. Anti-overflow scraper; 45. Stirring assembly; 451. Magnetic stirrer; 452. Magnetic stirring bar; 46. Heating element; 461. Electric heating rod; 462. End cover; 47. Adjustment slot; 471. Spring; 5. Driving block; 6. Anti-blocking plate; 61. Anti-blocking ball; 62. Guide slot; 621. Elastic element; 63. Connecting plate; 631. Torsion spring; 7. Servo motor; 71. Worm; 711. Worm wheel; 8. Blanking box; 81. Roller; 9. Recovery box. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-4 This application is described in further detail.

[0030] The embodiment of the present application discloses an SMT printer.

[0031] Reference Figure 1 and Figure 2 An SMT printer includes a printer body 1, a cover 11 is hinged on the top of the printer body 1, and a visual window 111 is installed on the cover 11, a solder paste steel mesh 12 and a material discharge plate 13 are arranged in the printer body 1, a support plate frame 14 is fixedly arranged in the printer body 1, and the solder paste steel mesh 12 is arranged on the support plate frame 14. The material discharge plate 13 is located directly below the solder paste steel mesh 12 and is slidably arranged in the printer body 1 along a width direction parallel to the printer body 1. A guide rail 2 is provided on the inner top of the printing machine body 1 in parallel with its own length direction, a moving block 3 is slidably sleeved on the guide rail 2, a tin storage box 4 is provided at the bottom of the moving block 3 for lifting and lowering by a cylinder 31, a tin injection port 41 is fixedly provided on the top wall at one end of the tin storage box 4, and a rolling brush 42 is provided at the bottom of the tin storage box 4 for rotating along its own length direction, a scraper plate 44 is installed on the side wall of the tin storage box 4 away from the direction of the coating, and a stirring assembly 45 and a heating element 46 are provided in the tin storage box 4.

[0032] Reference Figure 1 and Figure 2Before the printer starts working, the staff will inject the solder paste into the tin storage box 4 from the tin injection port 41, and use the stirring component 45 and the heating element 46 to maintain the uniformity and fluidity of the solder paste. Then install the solder paste steel mesh 12 that matches the specifications of the PCB board to be printed on the printer body 1, and then accurately place the PCB board on the solder paste steel mesh 12 on the discharge plate 13. When the printer is working, under the guidance and drive of the guide rail 2, the moving block 3 drives the rolling brush 42 on the tin storage box 4 to evenly coat the solder paste on the solder paste steel mesh 12. The scraper plate 44 connected to the rear side of the tin storage box 4 follows the moving trajectory of the rolling brush 42, and scrapes the solder paste into the feeding hole of the solder paste steel mesh 12 until the solder paste leaks through the steel mesh and is printed on the PCB board, achieving fine welding preparation.

[0033] Reference Figure 2 The stirring assembly 45 includes a magnetic stirrer 451 and a magnetic stirrer 452. The magnetic stirrer 451 is installed on the top of the tin storage box 4, and the magnetic stirrer 452 is placed in the tin storage box 4 and adsorbed on the inner top wall of the tin storage box 4 through the magnetic attraction of the magnetic stirrer 451.

[0034] Reference Figure 2 , the two opposite side walls of the tin storage box 4 along the length direction are vertically provided with adjustment grooves 47, the end of the rotating shaft of the rolling brush 42 is vertically slidably matched with the corresponding adjustment groove 47, and each adjustment groove 47 is provided with a spring 471 supporting between the inner top wall of the adjustment groove 47 and the end of the rotating shaft of the rolling brush 42. When the spring 471 is in a natural state, the rolling brush 42 achieves a sealing effect on the bottom discharge port 16 of the tin storage box 4, and when the tin storage box 4 moves down to the point where the rolling brush 42 presses against the solder paste steel mesh 12, the solder paste overflows from the gap between the bottom discharge port 16 of the tin storage box 4 and the rolling brush 42, and is coated on the solder paste steel mesh 12 as the rolling brush 42 rolls.

[0035] Reference Figure 2 The heating element 46 includes an electric heating rod 461 and an end cover 462, and the end cover 462 is fixedly sleeved on the electric heating rod 461. The electric heating rod 461 is inserted into the tin storage box 4 from the tin injection port 41, and the end cover 462 is rotatably sleeved on the tin injection port 41 through a thread.

[0036] Reference Figure 1 and Figure 3 The scraper plate 44 is mounted on the tin storage box 4 by snap-fitting with the hook plate 43. The scraper plate 44 includes a scraper body 441 and an anti-overflow scraper 442. The scraper body 441 is connected to the back of the tin storage box 4 in parallel with the tin storage box 4. The anti-overflow scraper 442 is located at both ends of the scraper body 441 and is integrally formed at the end of the scraper body 441 facing the tin storage box 4.

[0037] Reference Figure 1 and Figure 3The guide rail 2 includes a guide rod 21, a screw rod 22 and a lead screw 23 arranged in parallel. The moving block 3 is slidably sleeved on the guide rod 21 and is rotatably sleeved on the screw rod 22 through a thread. A driving block 5 is slidably arranged along the length direction of the guide rod 21 on the side of the scraper plate 4 away from the tin storage box 4. An anti-blocking plate 6 is arranged at the bottom of the driving block 5 through the cylinder 31. The lead screw 23 is located on the side of the guide rod 21 away from the screw rod 22. The driving block 5 is slidably sleeved on the guide rod 21 and is rotatably sleeved on the lead screw 23 through a thread.

[0038] Reference Figure 1 An L-shaped support seat 151 is provided on the outer side wall of the printing machine body 1 through the rotation of the electric turntable 15, and the servo motor 7 is fixedly provided on the support seat 151. The ends of the screw 22 and the lead screw 23 close to the servo motor 7 extend out of the printing machine body 1. A worm 71 is coaxially fixed on the output shaft of the servo motor 7. The worm 71 is located between the screw 22 and the lead screw 23, and a worm wheel 711 meshing with the worm 71 is fixedly sleeved on the screw 22 and the lead screw 23.

[0039] Reference Figures 1 to 3 When it is necessary to drive the tin storage box 4 to evenly coat the solder paste steel mesh 12 with solder paste, the electric turntable 15 drives the support seat 151 to rotate until the worm 71 on the output end of the servo motor 7 is engaged with the worm wheel 711 on the screw 22. At this time, the servo motor 7 is working, and the rotation of its output shaft drives the screw 22 to rotate, thereby realizing the translation of the tin storage box 4; when the anti-blocking plate 6 is needed to clear the feeding hole of the solder paste steel mesh 12, the electric turntable 15 drives the support seat 151 to rotate until the worm 71 on the output end of the servo motor 7 is engaged with the worm wheel 711 on the screw 23. At this time, the servo motor 7 is working, and the rotation of its output shaft drives the screw 23 to rotate, thereby realizing the translation of the anti-blocking plate 6.

[0040] Reference Figure 4 A plurality of anti-blocking balls 61 are evenly distributed at the bottom of the anti-blocking plate 6 along its length direction. A guide groove 62 is vertically opened at the bottom of the anti-blocking plate 6 corresponding to each anti-blocking ball 61, and each guide groove 62 is provided with an elastic member 621. In this embodiment, a compression spring is used as the elastic member 621. The compression spring is located in the guide groove 62 and connected between the anti-blocking ball 61 and the inner top wall of the guide groove 62.

[0041] Reference Figure 1 and Figure 4 A blanking box 8 is provided at the bottom of the solder paste steel mesh 12, and a connecting plate 63 is connected between the blanking box 8 and the side wall of the solder paste steel mesh 12 extending from the same side end of the anti-blocking plate 6, and the blanking box 8 and the connecting plate 63 are rotatably connected, and a torsion spring 631 is sleeved on the connecting shaft of the blanking box 8 and the connecting plate 63, and the torsion spring 631 abuts between the blanking box 8 and the connecting plate 63.

[0042] Reference Figure 1 and Figure 4 A discharge port 16 is provided at the end of the printing machine body 1 along the direction of the coating, a recovery box 9 is placed below the discharge port 16, and a guide ramp 161 extending into the recovery box 9 is fixedly provided at the discharge port 16, and a roller 81 is provided on the top wall of the blanking box 8 to rotate toward the guide ramp 161. When the blanking box 8 slides toward the recovery box 9 until the roller 81 hits the guide ramp 161, the blanking box 8 tilts toward the recovery box 9 until the solder paste liquid collected in the blanking box 8 is transferred to the recovery box 9.

[0043] Reference Figure 4 A circle of overlapping grooves 141 are provided at the top of the inner side wall of the support plate frame 14, and the solder paste steel mesh 12 is plugged into and fitted with the overlapping grooves 141. In order to reduce the possibility of solidification of solder paste at the feeding hole of the solder paste steel mesh 12, a heating gasket 1411 is provided in the overlapping groove 141, and the peripheral bottom wall of the solder paste steel mesh 12 is overlapped on the heating gasket 1411.

[0044] The implementation principle of an SMT printer in the embodiment of the present application is as follows: before the printer starts working, the staff injects solder paste into the tin storage box 4 from the tin injection port 41, and drives the magnetic stirrer 452 to rotate under the heating and stirring action of the magnetic stirrer 451 and the electric heating rod 461 to maintain the uniformity and fluidity of the solder paste. Then, the solder paste steel mesh 12 matching the specifications of the PCB board to be printed is installed, and then the solder paste steel mesh 12 is docked on the discharge plate 13 to accurately place the PCB board.

[0045] When it is necessary to drive the tin storage box 4 to evenly coat the solder paste steel mesh 12 with solder paste, the cylinder 31 drives the tin storage box 4 to descend until the rolling brush 42 is pressed against the surface of the solder paste steel mesh 12 until the solder paste overflows onto the mesh surface of the solder paste steel mesh 12 following the rotation of the rolling brush 42, and then the electric turntable 15 drives the support seat 151 to rotate until the worm 71 on the output end of the servo motor 7 engages with the worm gear 711 on the screw 22. At this time, the servo motor 7 is working, and the rotation of its output shaft drives the screw 22 to rotate. The moving block 3 drives the rolling brush 42 on the tin storage box 4 to evenly coat the solder paste steel mesh 12 with solder paste, and the scraper plate 44 connected to the rear side of the tin storage box 4 follows the moving trajectory of the rolling brush 42 to scrape the solder paste into the feed hole of the solder paste steel mesh 12 until the solder paste passes through the steel mesh and is printed onto the PCB board, thereby achieving fine welding preparation. During this process, the scraper plate 44 pushes the excess solder paste on the solder paste steel mesh 12 to the discharge port 16, and enters the recovery box 9 along the guide inclined plate 161 to be recovered and reused.

[0046] After the staff takes out the printed PCB board, when the anti-blocking plate 6 is needed to clear the feed hole of the solder paste steel mesh 12, the anti-blocking plate 6 at the bottom of the drive block 5 is lowered to fit the solder paste steel mesh 12 by the cylinder 31, and then the electric turntable 15 drives the support seat 151 to rotate until the worm 71 on the output end of the servo motor 7 is engaged with the worm wheel 711 on the screw 23. At this time, the servo motor 7 is working, and the rotation of its output shaft drives the screw 23 to rotate, thereby realizing the translation of the anti-blocking plate 6. During the movement of the anti-blocking plate 6, the anti-blocking ball 61 on the anti-blocking plate 6 is squeezed by the solder paste steel mesh 12, causing the corresponding elastic member 621 to deform until the anti-blocking ball 61 is aligned with the feed hole. The elastic member 621 drives the anti-blocking ball 61 to reset downward, and the anti-blocking ball 61 can clear the feed hole to reduce the solidified solder paste from blocking the feed hole. When the anti-blocking plate 6 continues to move, the solder paste steel mesh 12 squeezes the anti-blocking ball 61 again to move upward, the elastic member 621 is deformed again, and the anti-blocking ball 61 is separated from the feed hole, and this reciprocating process is repeated until the feed hole of the entire solder paste steel mesh 12 is cleared.

[0047] During the process of the anti-blocking plate 6 clearing the solder paste steel mesh 12, the solder paste cleared from the feed hole by the anti-blocking ball 61 falls into the synchronously moving blanking box 8, and the blanking box 8 slides toward the recovery box 9 during the collection process until the roller 81 hits the guide ramp 161. The blanking box 8 tilts toward the recovery box 9 due to the contact guide of the roller 81 and the cooperation of the torsion spring 631, until the solder paste liquid collected in the blanking box 8 is transferred to the recovery box 9, so as to facilitate the centralized processing of the recovered solder paste.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An SMT printer, comprising a printer body (1), wherein a solder paste steel mesh (12) and a material discharge plate (13) are arranged in the printer body (1), wherein the material discharge plate (13) is located directly below the solder paste steel mesh (12), and wherein the printing machine body (1) is provided with a solder paste steel mesh (12) and a material discharge plate (13). The inner top of the printing machine body (1) is provided with a guide rail (2) parallel to its own length direction, and a moving block (3) is slidably sleeved on the guide rail (2). A tin storage box (4) is provided at the bottom of the moving block (3) for lifting and lowering. A rolling brush (42) is provided at the bottom of the tin storage box (4) for rotating along its own length direction, and a scraper plate (44) is connected to the side wall of the tin storage box (4) away from the direction of the coating, and a top wall at one end of the tin storage box (4) is provided. A tin injection port (41) is provided, and a stirring assembly (45) and a heating element (46) are provided in the tin storage box (4). The stirring assembly (45) comprises a magnetic stirrer (451) and a magnetic stirrer (452). The magnetic stirrer (451) is installed on the top of the tin storage box (4), and the magnetic stirrer (452) is placed in the tin storage box (4) and adsorbed on the inner top wall of the tin storage box (4) through the magnetic attraction of the magnetic stirrer (451).

2. The SMT printer according to claim 1, characterized in that The heating element (46) includes an electric heating rod (461) and an end cover (462) sleeved on the electric heating rod (461); the electric heating rod (461) is inserted into the tin storage box (4) from the tin injection port (41); and the end cover (462) is sleeved on the tin injection port (41) by means of a threaded rotation.

3. The SMT printer according to claim 1, characterized in that A support plate frame (14) is arranged inside the printer body (1), a circle of overlapping grooves (141) are provided on the top of the inner wall of the support plate frame (14), a heating gasket (1411) is arranged inside the overlapping groove (141), and the peripheral bottom wall of the solder paste steel mesh (12) is overlapped on the heating gasket (1411) and plugged into and matched with the overlapping groove (141).

4. The SMT printer according to claim 1, characterized in that The guide rail (2) includes a guide rod (21) and a screw rod (22) arranged in parallel. The moving block (3) is slidably mounted on the guide rod (21) and is rotatably mounted on the screw rod (22) through a thread. A servo motor (7) is arranged on the outer wall of the printing machine body (1), and the servo motor (7) drives the screw rod (22) to rotate.

5. The SMT printer according to claim 4, characterized in that A driving block (5) is slidably arranged on the side of the scraper plate (44) away from the tin storage box (4) along the length direction of the guide rod (21), and a blocking plate (6) is lifted and lowered at the bottom of the driving block (5). The guide rail (2) also includes a rotatably arranged screw rod (23), which is located on the side of the guide rod (21) away from the screw rod (22) and is arranged parallel to the guide rod (21). The driving block (5) is slidably sleeved on the guide rod (21) and is rotatably sleeved on the screw rod (23) through a thread, and the servo motor (7) drives the screw rod (23) to rotate.

6. The SMT printer according to claim 5, characterized in that The outer side wall of the printing machine body (1) is rotatably provided with an L-shaped support seat (151), the servo motor (7) is arranged on the support seat (151), the ends of the screw rod (22) and the lead screw (23) close to the servo motor (7) extend out of the printing machine body (1), the output shaft of the servo motor (7) is coaxially provided with a worm (71), the worm (71) is located between the screw rod (22) and the lead screw (23), and the screw rod (22) and the lead screw (23) are both sleeved with a worm wheel (711) meshing with the worm (71).

7. The SMT printer according to claim 5, characterized in that The bottom of the anti-blocking plate (6) is provided with a plurality of anti-blocking balls (61) equidistantly distributed along its length direction. A guide groove (62) is vertically provided at the inner bottom of the anti-blocking plate (6) corresponding to each anti-blocking ball (61), and each guide groove (62) is provided with an elastic member (621), and the elastic member (621) connects the anti-blocking ball (61) and the inner top wall of the guide groove (62). A blanking box (8) is provided at the bottom of the solder paste steel mesh (12), and a connecting plate (63) is connected between the blanking box (8) and the side wall of the solder paste steel mesh (12) extending from the same side of the anti-blocking plate (6).

8. The SMT printer according to claim 7, characterized in that: A discharge port (16) is provided on the printing machine body (1) at the end along the direction of the coating, a recovery box (9) is provided below the discharge port (16), and a guide inclined plate (161) extending into the recovery box (9) is provided at the discharge port (16), the blanking box (8) is rotatably connected to the connecting plate (63) via a torsion spring (631), and a roller (81) is provided on the top wall of one side of the blanking box (8) for rotation toward the guide inclined plate (161), when the blanking box (8) slides toward the recovery box (9) until the roller (81) contacts the guide inclined plate (161), the blanking box (8) tilts toward the recovery box (9) until the solder paste liquid collected in the blanking box (8) is transferred into the recovery box (9).

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