Automatic silk screen printing platform

Abstract

The application relates to an automatic silk screen printing platform, which comprises a main workbench, a Z-axis assembly, a printing assembly, a camera X-beam assembly, a PCB workbench assembly and a three-degree-of-freedom adjusting assembly. The Z-axis assembly is fixed on the main workbench, and a Z-axis sliding block mounting plate which can move up and down along the vertical direction is arranged on the Z-axis assembly. The printing assembly is fixed on the Z-axis sliding block mounting plate and moves up and down with the Z-axis sliding block mounting plate. The PCB workbench assembly is arranged on the main workbench through the three-degree-of-freedom adjusting assembly. According to the application, the printing assembly and the steel net are lowered to the upper surface of the main aluminum material of the assembly line through the Z-axis assembly, meanwhile, the machining workbench and the PCB top block are lifted through the lifting shaft stepping motor, so that the upper surface of the PCB plate is overlapped with the upper surface of the main aluminum material of the assembly line, the traditional heavy whole Z-axis is split into the beneficial effects of the lightweight lowering of the steel net side and the lightweight lifting of the PCB side, the performance requirements of the servo motor and the screw rod are reduced, and the safety hidden danger caused by the weight of the moving parts is reduced.

Description

Technical Field

[0001] This invention relates to an automatic screen printing station, mainly embodying a method for PCB solder paste printing, especially a PCB printing method that requires both efficiency and precision. Background Technology

[0002] There are three main methods for PCB solder paste printing. The first is a manual screen printing table. The PCB board needs to be placed manually and fixed by pins. The alignment of the PCB board and the stencil also depends on manual operation. Applying solder paste also needs to be done manually. Its disadvantages are low efficiency, poor precision, and the printing quality is greatly affected by the operator's skill level. It is difficult to guarantee consistency and cannot meet the needs of mass production.

[0003] The second type is a semi-automatic screen printing station, whose main disadvantages are as follows: First, it is highly dependent on manual labor and has poor consistency. The loading and unloading of boards, alignment, and stencil placement all rely on manual labor, resulting in large human errors. Differences in the proficiency of different operators lead to differences in the printing quality of PCB boards in the same batch. Second, each cycle is time-consuming and only suitable for small-batch production. Third, the upper limit of accuracy is limited. Alignment is mostly done visually without Mark visual calibration, resulting in a low yield rate for fine-pitch components and difficulty in accurately quantifying minute parameters. Fourth, there is human-machine interference, posing significant safety hazards. Fifth, it cannot be connected to upstream or downstream automated equipment and is difficult to integrate into automated production lines.

[0004] The third type is the fully automatic screen printing station. PCB boards enter the workstation in an assembly line manner. The alignment of the PCB board and stencil relies on vision calculation, and the PCB solder paste printing is completed automatically. Its production efficiency can reach 10 seconds per board, with very high precision, capable of printing pads as small as 0.1005. However, it also has many limitations. Structurally, the fully automatic screen printing station is designed to match SMT production lines. If any part of the production line malfunctions, the printing machine will be idle. The whole machine includes a Mark camera, stencil camera, X, Y, and Z servo axes, automatic cleaning module, board feeding and unloading rails, vacuum platform, etc. Any camera dirt, loose belt, or sensor mis-triggering will directly cause the entire line to stop, and manual printing at a single station is not possible for emergency repairs. In terms of cost, a standard fully automatic printing machine starts at 100,000 RMB, while a high-end printing machine approaches 300,000 RMB. Servo motors, vision lenses, and motion control cards are not interchangeable between manufacturers and are mostly custom-made by the original manufacturer, with no universal replacement parts. The ordering cycle for spare parts is long, and the annual maintenance fee is expensive. A constant temperature and dust-free workshop, a regulated power supply, and a compressed drying air source are required, and the investment in workshop renovation cannot be ignored. Most of them are equipped with online solder paste detection (SPI), which further increases the cost. In terms of usage scenarios, it is not cost-effective to change models frequently in small batches. When changing models for orders of 100 pieces or less, the time spent changing the stencil, modifying the program, and calibrating the alignment is far greater than the printing time, resulting in a cost inversion for small-batch production. Ordinary operators can only perform simple loading and unloading. Program modifications, alignment offset adjustments, and electrical faults must be handled by dedicated equipment engineers, increasing fixed labor costs.

[0005] In summary, existing manual screen printing stations suffer from low efficiency and poor accuracy, semi-automatic screen printing stations suffer from high reliance on manual labor, limited accuracy, and significant safety hazards, while fully automatic screen printing stations have problems such as high procurement costs, high operating costs, and poor flexibility for small batches. Therefore, there is a need for an automatic screen printing station that combines the low cost and flexible line change of semi-automatic stations with the high accuracy and stable process of fully automatic stations. Summary of the Invention

[0006] The purpose of this invention is to provide an automatic screen printing table.

[0007] The objective of this invention is achieved through the following technical solution: an automatic screen printing table, comprising a main worktable, a Z-axis assembly, a printing assembly, a camera X-beam assembly, a PCB work platform assembly, and a three-degree-of-freedom adjustment assembly. The Z-axis assembly is fixed on the main worktable and has a Z-axis slider mounting plate that can move vertically up and down. The printing assembly is fixed on the Z-axis slider mounting plate and moves up and down with it. The PCB work platform assembly is set on the main worktable via the three-degree-of-freedom adjustment assembly. The PCB work platform assembly includes a liftable processing worktable and a PCB top block set on the processing worktable. During printing, the Z-axis assembly drives the stencil in the printing assembly to descend until it coincides with the upper surface of the aluminum material of the production line main body of the PCB work platform assembly. At the same time, the processing worktable drives the PCB top block to rise so that the upper surface of the PCB board coincides with the upper surface of the aluminum material of the production line main body, thereby achieving the bonding printing of the stencil and the PCB board.

[0008] As a further description of the above technical solution: The Z-axis assembly includes a Z-axis servo motor, a Z-axis mounting plate, a Z-axis lead screw module, Z-axis columns, a Z-axis guide rail mounting plate, a Z-axis slider guide rail, and a Z-axis slider mounting plate. The Z-axis servo motor is mounted below the Z-axis mounting plate, and the Z-axis guide rail mounting plate is mounted above it. Two Z-axis columns are mounted on both sides of the Z-axis guide rail mounting plate and are simultaneously fixed to it. The Z-axis slider guide rail is mounted on the Z-axis guide rail mounting plate and is parallel to each other. The Z-axis slider mounting plate is fixed to the slider on the Z-axis slider guide rail and can move up and down vertically. The lead screw nut of the Z-axis lead screw module is fixed to the Z-axis slider mounting plate. One end of the lead screw of the Z-axis lead screw module is connected to the Z-axis servo motor. The rotation of the Z-axis servo motor drives the Z-axis slider mounting plate to move up and down along the Z-axis slider guide rail.

[0009] As a further description of the above technical solution: The printing assembly includes a printing beam, a squeegee assembly, a screen frame assembly, a camera Y-axis drive device, and a squeegee spindle. The printing beam is fixed on a Z-axis slider mounting plate, the screen frame assembly is mounted on the printing beam, the steel mesh is placed on the screen frame assembly and fixed by a mesh locking nut, the squeegee spindle is mounted on the printing beam, and the squeegee assembly is mounted on the squeegee shaft mounting plate of the squeegee spindle and can slide back and forth along the squeegee spindle. Camera Y-axis rail mounting plates are mounted on both sides of the printing beam, and camera Y-axis guide rails are mounted on the camera Y-axis rail mounting plates. One of the camera Y-axis rail mounting plates is equipped with a camera Y-axis drive device.

[0010] As a further description of the above technical solution: The scraper assembly consists of a front scraper cylinder and a rear scraper cylinder, with a front scraper blade and a rear scraper blade respectively mounted on the front and rear scraper cylinders. The scraper spindle consists of a scraper spindle stepper motor, a scraper spindle timing belt, a scraper spindle timing pulley, and a scraper spindle mounting plate. The scraper spindle stepper motor drives the scraper spindle mounting plate to slide back and forth on the scraper spindle via the scraper spindle timing belt and the scraper spindle timing pulley, thereby driving the front and rear scraper blades to slide back and forth on the steel mesh.

[0011] As a further description of the above technical solution: The camera X-beam assembly includes a camera X-beam body, a camera X-axis slider guide rail, a camera X-axis drive device, and a camera component. A camera Y-axis connecting block is mounted on each side of the camera X-beam body. These connecting blocks are connected to camera X-axis connecting blocks on the printed assembly. A camera Y-axis slider is mounted on the camera Y-axis connecting block and can slide back and forth along the camera Y-axis guide rail. A camera Y-axis servo motor drives the camera X-beam body to move along the camera Y-axis guide rail via a camera Y-axis lead screw. The camera X-axis slider guide rail and the camera X-axis drive device are mounted above the camera X-beam body. The camera component is mounted on the camera X-axis slider guide rail and fixedly connected to the camera body component connecting block. The camera X-axis drive device drives the camera component to slide back and forth along the camera X-axis slider guide rail.

[0012] As a further description of the above technical solution: The camera assembly includes a camera mounting plate, a PCB positioning sensor, a Mark camera, a light source assembly mounting box, and a PCB positioning cylinder. The light source assembly mounting box contains a lower-view coaxial light source, an upper-view coaxial light source, and a beam splitter. The beam splitter changes the direction of light propagation by 90 degrees, enabling a single Mark camera to simultaneously identify Mark points on the PCB board and Mark points on the stencil. When the lower-view coaxial light source is turned on, the Mark camera is in a state of identifying Mark points on the PCB board downwards, and when the upper-view coaxial light source is turned on, the Mark camera is in a state of identifying Mark points on the stencil upwards.

[0013] As a further description of the above technical solution: The PCB work platform assembly includes a base plate, a lifting axis stepper motor, a production line drive device, a production line width-adjusting axis stepper motor, a lifting drive device, a processing worktable, a PCB top block, and a production line assembly. The lifting axis stepper motor is mounted below the base plate, and the production line drive device and lifting drive device are mounted on the base plate. The lifting drive device includes a lifting synchronous pulley, a lifting lead screw, and a lifting nut. The processing worktable is fixedly connected to the lifting nut. The lifting axis stepper motor drives the lifting lead screw to rotate via a synchronous belt, causing the processing worktable to move up and down. The PCB top block is magnetically attached to the processing worktable to support the PCB board.

[0014] As a further description of the above technical solution: The assembly line drive device includes an assembly line synchronous pulley, a left-hand lead screw, a left-hand lead screw nut block, a left-hand assembly line mounting block, a coupling, a right-hand assembly line mounting block, a right-hand lead screw nut block, a right-hand lead screw, and an assembly line slider guide rail. One end of the left-hand lead screw is equipped with the assembly line synchronous pulley, and the other end is connected to the right-hand lead screw via a coupling. The left-hand assembly line mounting block is connected to the left-hand lead screw nut block and the slider on the assembly line slider guide rail. The right-hand assembly line mounting block is connected to the right-hand lead screw nut block and the slider on the assembly line slider guide rail. The assembly line width-adjusting axis stepper motor drives the left-hand and right-hand lead screws to rotate via a synchronous belt, causing the left-hand and right-hand assembly line mounting blocks to move in opposite directions or away from each other along the assembly line slider guide rail, thereby ensuring that the PCB board is always in the center position.

[0015] As a further description of the above technical solution: The assembly line consists of two main aluminum sections, each divided into three sections: an infeed area, a working area, and an outfeed area. The infeed area comprises a PCB infeed conveyor belt, a PCB infeed material signal sensor, a PCB conveyor belt shaft stepper motor, and a PCB infeed waiting signal sensor. The working area comprises a working conveyor belt shaft stepper motor and a PCB working conveyor belt. The outfeed area comprises a PCB conveyor belt shaft motor, a PCB outfeed arrival signal sensor, and a PCB outfeed conveyor belt. The infeed area, working area, and outfeed area are driven independently.

[0016] As a further description of the above technical solution: The three-degree-of-freedom adjustment assembly includes a UVW mounting platform, a U-drive motor assembly, a V-drive motor assembly, a W-drive motor assembly, a U-adjustment assembly, a V-adjustment assembly, a W-adjustment assembly, and a work platform connecting plate. The UVW mounting platform is fixed on the main worktable. The U-drive motor assembly, V-drive motor assembly, and W-drive motor assembly are connected to the main worktable via drive motor mounting bases. The U-adjustment assembly, V-adjustment assembly, and W-adjustment assembly are connected to the main worktable via UVW lower guide rail sliders. Each adjustment assembly has a lower guide rail slider mounting aluminum block, a crossed roller bearing, an upper guide rail slider mounting aluminum block, and a UVW upper guide rail slider mounted sequentially above the UVW lower guide rail slider. The work platform connecting plate is connected to the UVW upper guide rail slider and fixedly connected to the base plate above it. The three-degree-of-freedom adjustment assembly is used to adjust the X-direction deviation, Y-direction deviation, and angular deviation of the PCB work platform assembly.

[0017] Compared with the prior art, the advantages of the present invention are as follows: 1. The Z-axis assembly drives the printing assembly and stencil to descend to the upper surface of the main aluminum material of the production line. At the same time, the lifting axis stepper motor drives the processing worktable and PCB top block to rise so that the upper surface of the PCB board coincides with the upper surface of the main aluminum material of the production line. This achieves the beneficial effect of splitting the traditional heavy-duty integral Z-axis into a lightweight descent on the stencil side and a lightweight rise on the PCB side. This reduces the performance requirements of the servo motor and lead screw, reduces the safety hazards caused by the weight of moving parts, and also reduces the requirements for equipment processing and assembly accuracy and production costs.

[0018] 2. A beam splitter, in conjunction with a lower-viewing coaxial light source and an upper-viewing coaxial light source, enables a single Mark camera to alternately identify PCB board Mark points and stencil Mark points. Simultaneously, a three-degree-of-freedom adjustment assembly drives the PCB work platform assembly to adjust the X-direction, Y-direction, and angular deviations. Furthermore, the production line width-adjusting axis stepper motor drives the left-hand and right-hand lead screws to make the two main aluminum materials of the production line move towards or away from each other. This achieves the beneficial effects of a single camera completing dual-target recognition, high-precision automatic alignment, and automatic centering and clamping of the PCB board. It reduces the number of cameras, lowers costs, improves printing alignment accuracy and line change efficiency, and ensures the centering and positioning of PCB boards of different sizes. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main body of an embodiment of an automatic screen printing table according to the present invention; Figure 2 This is an exploded structural diagram of the main body of an automatic screen printing table proposed in this invention; Figure 3 This is an exploded view of the Z-axis assembly of an automatic screen printing table proposed in this invention. Figure 4 This is an exploded view of the printing assembly of an automatic screen printing table proposed in this invention. Figure 5 This is an exploded view of the camera X-beam assembly of an automatic screen printing table proposed in this invention. Figure 6 This is an exploded view of the camera assembly of an automatic screen printing station proposed in this invention. Figure 7 This is an exploded view of the PCB work platform assembly of an automatic screen printing station proposed in this invention. Figure 8 This is an exploded structural diagram of an automated screen printing table production line drive device proposed in this invention. Figure 9 This is a schematic diagram of the assembly line and lifting drive device of an automatic screen printing table proposed in this invention. Figure 10 This is an exploded view of the three-degree-of-freedom adjustment component of an automatic screen printing table proposed in this invention. Figure 11 This is an exploded view of the drive motor assembly and adjustment assembly of an automatic screen printing table proposed in this invention. Figure 12 This is a schematic diagram illustrating the operating principle of an automatic screen printing table body proposed in this invention. Figure 13 This is a diagram illustrating the operation of an automatic screen printing table for detection and clamping proposed in this invention. Figure 14 This is a schematic diagram illustrating the operating principle of an automatic screen printing table adjusting the printing structure according to the present invention. Figure 15 This is a schematic diagram illustrating the circuit operation principle of an automatic screen printing table body proposed in this invention. Figure 16 This is a schematic diagram illustrating the circuit operation principle of a Mark camera in an automatic screen printing station proposed in this invention. Figure 17 This is a schematic diagram of the circuit principle of an automatic screen printing table with multi-axis operation proposed in this invention.

[0020] Label Explanation: 1. Main Worktable; 11. Left Start Button; 12. Reset Button; 13. Display and Control Touch Screen; 14. Right Start Button; 2. Z-Axis Assembly; 21. Z-Axis Servo Motor; 22. Z-Axis Mounting Plate; 23. Z-Axis Lead Screw Module; 24. Z-Axis Column; 25. Z-Axis Guide Rail Mounting Plate; 26. Z-Axis Slider Guide Rail; 27. Z-Axis Slider Mounting Plate; 28. Z-Axis Decorative Cover; 3. Printing Assembly; 31. Printing Beam; 32. Scraper Assembly; 321. Front Scraper Cylinder; 3211. Front Scraper Blade; 322. Rear Scraper Cylinder; 3221. Rear Scraper Blade; 33. Frame Assembly; 331. Steel Mesh; 332. Mesh Locking Nut; 34. Camera Y-Axis Drive Device; 341. Camera Y-Axis Servo Motor; 342. 343. Camera X-axis connecting block; 344. Camera Y-axis lead screw; 345. Camera Y-axis transmission lead screw fixing seat; 36. Camera Y-axis guide rail; 37. Camera Y-axis rail mounting plate; 38. Scraper spindle; 371. Scraper shaft stepper motor; 372. Scraper shaft synchronous belt; 373. Scraper shaft synchronous pulley; 374. Scraper shaft mounting plate; 49. Camera X-beam assembly; 40. Camera Y-axis connecting block; 41. Camera Y-axis slider; 42. Camera Y-axis slider; 43. Camera X-beam body; 44. Camera X-axis slider guide rail; 45. Camera X-axis drive device; 451. Camera body assembly connecting block; 452. Camera X-axis lead screw; 453. Camera X-axis servo motor; 454. Camera X-axis transmission lead screw fixing seat; 46. Camera assembly; 461. Camera mounting plate 462. PCB positioning sensor; 463. Mark camera; 464. Downward-viewing coaxial light source; 465. Light source assembly mounting box; 466. PCB positioning cylinder; 467. Upward-viewing coaxial light source; 468. Beam splitter; 5. PCB work platform assembly; 51. Lifting axis stepper motor; 52. Base plate; 53. Horizontal lead screw support; 54. Production line drive device; 541. Production line synchronous pulley; 542. Left-hand lead screw; 543. Left-hand lead screw nut block; 544. Left-hand production line mounting block; 545. Coupling; 546. Right-hand production line mounting block; 547. Right-hand lead screw nut block; 548. Right-hand lead screw; 549. Production line slider guide rail; 55. Production line width-adjusting axis stepper motor; 56. Lifting drive device 561. Lifting synchronous pulley; 562. Lifting lead screw; 563. Lifting nut; 57. Processing worktable; 58. PCB top block; 59. Production line assembly; 591. PCB feeding conveyor belt; 592. PCB feeding material signal sensor; 593. PCB board conveyor belt shaft stepper motor; 594. PCB board feeding waiting signal sensor; 595. Working conveyor belt shaft stepper motor; 596. PCB board conveyor belt shaft motor; 597. PCB board exiting position signal sensor; 598. PCB board exiting conveyor belt; 599. PCB working conveyor belt; 5910. Production line main body aluminum material; 6. Three-degree-of-freedom adjustment assembly; 61. UVW mounting platform; 62. U drive motor assembly; 621. UVW drive motor;622. Drive motor nut; 623. Drive motor mounting bracket; 624. Drive motor chain block; 63. V drive motor assembly; 64. W drive motor assembly; 65. U adjustment assembly; 651. UVW lower guide rail slider; 652. Lower guide rail slider mounting aluminum block; 653. Cross roller bearing; 654. Upper guide rail slider mounting aluminum block; 655. UVW upper guide rail slider; 66. V adjustment assembly; 67. W adjustment assembly; 68. Work platform connecting plate. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments: like Figure 1 and 17 The diagram shown is an embodiment of an automatic screen printing table provided by the present invention, including a main worktable 1, a Z-axis assembly 2, a printing assembly 3, a camera X-beam assembly 4, a PCB work platform assembly 5, and a three-degree-of-freedom adjustment assembly 6. The main worktable 1 serves as the mounting base for the entire machine, providing stable mounting support and an operating platform for each functional component. The main worktable 1 is equipped with a left start button 11, a reset button 12, a display and control touch screen 13, and a right start button 14. The left start button 11 is used to issue a command to start the machine and trigger the automatic printing cycle. The reset button 12 is used to perform a reset operation in case of equipment failure or abnormality, so that each motion axis returns to its initial origin position and restores the machine to standby state. The display and control touch screen 13 is used to input PCB board size parameters and display the machine's movement parameters. The system allows for setting printing process parameters and enabling human-machine interaction. The right start button 14 and the left start button 11 work together to enable safe two-hand start operation to prevent accidental touch by one hand and ensure the safety of the operator. The Z-axis assembly 2 is fixed on the main worktable 1 to drive the printing assembly 3 to move up and down in the vertical direction to achieve the lifting action of the stencil 331. The Z-axis assembly 2 is equipped with a Z-axis slider mounting plate 27 that can move up and down in the vertical direction. The Z-axis slider mounting plate 27 is used to install and fix the printing assembly 3 and drive the printing assembly 3 to move up and down in the vertical direction. The printing assembly 3 is fixed on the Z-axis slider mounting plate 27 and moves up and down with it. The printing assembly 3 is used to carry the stencil 331 and perform solder paste scraping and printing to complete the solder paste printing process of the PCB board.

[0022] The PCB work platform assembly 5 is mounted on the main worktable 1 via a three-degree-of-freedom adjustment assembly 6. The PCB work platform assembly 5 carries the PCB board and performs its conveying, positioning, lifting, and clamping to provide stable workpiece support for solder paste printing. The three-degree-of-freedom adjustment assembly 6 adjusts the X-direction deviation, Y-direction deviation, and angular deviation of the PCB work platform assembly 5 to achieve high-precision alignment between the PCB board and the stencil 331. The PCB work platform assembly 5 includes a liftable processing worktable 57 and a PCB top block 58 mounted on the processing worktable 57. The processing worktable 57 carries the PCB top block 58 and drives the PCB board to rise and fall so that the upper surface of the PCB board coincides with the upper surface of the main aluminum material 5910 of the production line. The PCB top block 58 is magnetically attached to... The processing worktable 57 supports the bottom of the PCB board and lifts the PCB board to the printing height as the processing worktable 57 rises. During printing, the Z-axis assembly 2 drives the stencil 331 in the printing assembly 3 to descend until it overlaps with the upper surface of the aluminum body 5910 of the PCB work platform assembly 5. The stencil 331 has openings corresponding to the PCB board pads so that solder paste can be printed onto the PCB board through the openings. The aluminum body 5910 of the production line serves as the main structure of the production line assembly 59 for installing the conveyor belt, sensors, and drive motor, and provides side guidance and clamping support for the PCB board. At the same time, the processing worktable 57 drives the PCB top block 58 to rise so that the upper surface of the PCB board overlaps with the upper surface of the aluminum body 5910 of the production line, thereby achieving the bonding printing of the stencil 331 and the PCB board.

[0023] Z-axis assembly 2 includes a Z-axis servo motor 21, a Z-axis mounting plate 22, a Z-axis lead screw module 23, Z-axis columns 24, a Z-axis guide rail mounting plate 25, a Z-axis slider guide rail 26, a Z-axis slider mounting plate 27, and a Z-axis decorative cover 28. The Z-axis servo motor 21 is mounted below the Z-axis mounting plate 22 to provide power output for the lifting and lowering motion of the Z-axis assembly 2, precisely controlling the vertical movement position and speed of the Z-axis slider mounting plate 27. The Z-axis mounting plate 22 serves as the bottom mounting base for the Z-axis assembly 2, fixing the Z-axis servo motor 21 and connecting it to the main worktable 1 to provide a mounting and positioning reference for the Z-axis assembly 2. The Z-axis guide rail mounting plate 25 is mounted above the Z-axis mounting plate 22 to mount and fix the Z-axis slider guide rail 26, providing a vertical motion guide reference for the Z-axis slider mounting plate 27. Two Z-axis columns 24 are respectively mounted on both sides of the Z-axis guide rail mounting plate 25 and simultaneously fixed to the Z-axis mounting plate 22 to enhance the structural rigidity of the Z-axis guide rail mounting plate 25 and reduce motion stress during movement. Deformation and vibration are prevented. The Z-axis slider guide 26 is mounted on the Z-axis guide plate 25 and is parallel to each other to provide vertical linear motion guidance for the Z-axis slider mounting plate 27 to ensure the straightness and stability of the lifting motion. The Z-axis slider mounting plate 27 is fixedly connected to the slider on the Z-axis slider guide 26 and can move up and down in the vertical direction to install and fix the printing component 3 and drive the printing component 3 to move up and down in the vertical direction. The screw nut of the Z-axis screw module 23 is fixedly connected to the Z-axis slider mounting plate 27 and one end of the screw is connected to the Z-axis servo motor 21. The Z-axis screw module 23 is used to convert the rotational motion of the Z-axis servo motor 21 into linear motion to drive the Z-axis slider mounting plate 27 to move accurately in the vertical direction. The Z-axis decorative cover 28 is installed on the two Z-axis columns 24 to isolate external dust from contaminating the screw, slider and other moving parts, and at the same time prevent personnel from touching the moving parts and causing mechanical injury. The Z-axis servo motor 21 rotates to drive the Z-axis slider mounting plate 27 to move up and down along the Z-axis slider guide 26.

[0024] Printing assembly 3 includes a printing beam 31, a squeegee assembly 32, a stencil frame assembly 33, a camera Y-axis drive device 34, and a squeegee spindle 37. The printing beam 31, fixed to the Z-axis slider mounting plate 27, serves as the main load-bearing structure of printing assembly 3, supporting the squeegee assembly 32, stencil frame assembly 33, camera Y-axis drive device 34, and squeegee spindle 37 to provide an installation reference for each sub-component. The stencil frame assembly 33, mounted on the printing beam 31, places and fixes the stencil 331, providing a stable installation positioning reference for the stencil 331. The stencil 331 is placed on the stencil frame assembly 33 and fixed by a mesh locking nut 332. The stencil 331 has openings corresponding to the PCB board pads to allow solder paste to pass through and be printed onto the PCB board. The mesh locking nut 332 locks the stencil 331 securely to the stencil frame assembly 33 to prevent displacement during printing and maintain printing accuracy. The squeegee spindle 37, mounted on the printing beam 31, provides linear motion guidance and transmission for the squeegee assembly 32 in the X-axis direction. The dynamic support drives the scraper assembly 32 to slide back and forth along the length of the stencil 331. The scraper assembly 32 is mounted on the scraper shaft mounting plate 374 of the scraper spindle 37 and can slide back and forth along the scraper spindle 37 to scrape solder paste back and forth on the stencil 331 so that the solder paste is evenly printed onto the PCB board pads through the openings of the stencil 331. Camera Y-axis rail mounting plates 36 are mounted on both sides of the printed beam 31. The camera Y-axis rail mounting plates 36 are used to mount and fix the camera Y-axis guide rail 35 and the camera Y-axis drive device. 34 provides an installation reference for the Y-axis motion system. The camera Y-axis rail mounting plate 36 is equipped with a camera Y-axis guide rail 35. The camera Y-axis guide rail 35 is used to provide linear motion guidance in the Y-axis direction for the camera X-beam assembly 4 to ensure the straightness and stability of the movement in the Y direction. One side of the camera Y-axis rail mounting plate 36 is equipped with a camera Y-axis drive device 34. The camera Y-axis drive device 34 is used to drive the camera X-beam assembly 4 to move along the Y-axis direction to realize the position adjustment of the camera assembly 46 in the Y direction.

[0025] The scraper assembly 32 consists of a front scraper cylinder 321 and a rear scraper cylinder 322. The front scraper cylinder 321 drives the front scraper blade 3211 to press down and lift, thereby controlling the contact pressure between the front scraper blade 3211 and the steel mesh 331. The rear scraper cylinder 322 drives the rear scraper blade 3221 to press down and lift, thereby controlling the contact pressure between the rear scraper blade 3221 and the steel mesh 331. The front scraper cylinder 321 and the rear scraper cylinder 322 are respectively equipped with the front scraper blade 3211 and the rear scraper blade 3221. 21. The front squeegee blade 3211 contacts the surface of the stencil 331 and is used to scrape solder paste from one end to the other under the drive of the squeegee spindle 37 to complete the forward printing action. The rear squeegee blade 3221 contacts the surface of the stencil 331 and is used to scrape solder paste from one end to the other under the drive of the squeegee spindle 37 to complete the reverse printing action. The squeegee spindle 37 consists of a squeegee shaft stepper motor 371, a squeegee shaft timing belt 372, a squeegee shaft timing pulley 373, and a squeegee shaft mounting plate 374. Machine 371 provides power output for the transmission of the scraper spindle 37 to drive the scraper shaft mounting plate 374 to move back and forth along the scraper spindle 37 and control the scraping speed and stroke of the scraper. The scraper shaft timing belt 372 transmits the rotational motion of the scraper shaft stepper motor 371 to the scraper shaft timing pulley 373 to achieve synchronous power transmission. The scraper shaft timing pulley 373 cooperates with the scraper shaft timing belt 372 to convert the rotational motion into the linear motion of the scraper shaft mounting plate 374 to achieve the scraping speed of the scraper. The reciprocating movement of component 32, the scraper shaft mounting plate 374 is used to install and fix the scraper assembly 32 and slide back and forth along the X-axis direction under the drive of the scraper main shaft 37, thereby driving the scraper assembly 32 to scrape solder paste on the stencil 331. The scraper shaft stepper motor 371 drives the scraper shaft mounting plate 374 to slide back and forth on the scraper main shaft 37 through the scraper shaft synchronous belt 372 and the scraper shaft synchronous pulley 373, thereby driving the front scraper blade 3211 and the rear scraper blade 3221 to slide back and forth on the stencil 331.

[0026] The camera X-beam assembly 4 includes a camera X-beam body 43, a camera X-axis slider guide rail 44, a camera X-axis drive device 45, and a camera assembly 46. The camera X-beam body 43 serves as the main load-bearing structure of the camera X-beam assembly 4, used to mount the camera X-axis slider guide rail 44, the camera X-axis drive device 45, and the camera assembly 46, providing an installation reference for each sub-component. A camera Y-axis connecting block 41 is mounted on each side of the camera X-beam body 43. The camera Y-axis connecting block 41 connects to the camera X-axis connecting block 342 on the printing assembly 3 to drive the camera X-beam body 43 to move along the camera Y-axis guide rail 35. The camera Y-axis connecting block 41 connects to the camera X-axis connecting block 342 on the printing assembly 3, and the camera X-axis connecting block 342 transmits the rotational motion of the camera Y-axis lead screw 343 to the camera X-beam body 46. The X-beam assembly 4 drives the camera X-beam assembly 4 to move along the Y-axis. The camera Y-axis connecting block 41 is equipped with a camera Y-axis slider 42, which can slide back and forth along the camera Y-axis guide rail 35. The camera Y-axis slider 42 is used to cooperate with the camera Y-axis guide rail 35 to provide sliding support for the Y-direction movement of the camera X-beam assembly 4 to ensure smooth movement. The camera Y-axis servo motor 341 drives the camera X-beam body 43 to move along the camera Y-axis guide rail 35 through the camera Y-axis lead screw 343. The camera Y-axis servo motor 341 is used to provide power output to the camera Y-axis drive device 34 to accurately control the movement position of the camera X-beam assembly 4 along the Y-axis. The camera Y-axis lead screw 343 is used to convert the rotational motion of the camera Y-axis servo motor 341 into linear motion to drive the camera X-beam assembly 4 to move along the Y-axis.

[0027] The camera Y-axis lead screw 343 is supported and fixed at both ends by the camera Y-axis transmission lead screw fixing seat 344. The camera Y-axis transmission lead screw fixing seat 344 is used to support and fix the two ends of the camera Y-axis lead screw 343 to ensure the coaxiality and stability of the lead screw rotation and reduce the radial runout when the lead screw rotates. The camera X-axis slider guide 44 and the camera X-axis drive device 45 are installed above the camera X-beam body 43. The camera X-axis slider guide 44 is used to provide linear motion guidance in the X-axis direction for the camera assembly 46 to ensure the straightness and stability of the X-axis movement. The camera X-axis drive device 45 is used to drive the camera assembly 46 to move along the X-axis direction to realize the position adjustment of the camera assembly 46 in the X-axis direction. The camera assembly 46 is installed on the camera X-axis slider guide 44 and fixedly connected to the camera body assembly connecting block 451. The camera body assembly connecting block 451 is used to fix to the camera assembly 46 to transmit the rotational motion of the camera X-axis lead screw 452 to the camera assembly. The camera assembly 46 moves along the X-axis. The camera X-axis lead screw 452 converts the rotational motion of the camera X-axis servo motor 453 into linear motion to drive the camera assembly 46 to move along the X-axis. The camera X-axis servo motor 453 provides power output to the camera X-axis drive device 45 to precisely control the movement position of the camera assembly 46 along the X-axis. The two ends of the camera X-axis lead screw 452 are supported and fixed by the camera X-axis transmission lead screw fixing seat 454. The camera X-axis transmission lead screw fixing seat 454 supports and fixes the two ends of the camera X-axis lead screw 452 to ensure the coaxiality and stability of the lead screw rotation and reduce the radial runout when the lead screw rotates. The camera X-axis drive device 45 drives the camera assembly 46 to slide back and forth along the camera X-axis slider guide rail 44. The camera assembly 46 is used to identify the Mark points on the PCB board and stencil 331 to obtain the coordinate information of the Mark points and provide visual data for three-degree-of-freedom alignment adjustment.

[0028] Camera assembly 46 includes a camera mounting plate 461, a PCB positioning sensor 462, a Mark camera 463, a light source assembly mounting box 465, and a PCB positioning cylinder 466. The camera mounting plate 461 serves as the mounting base for the camera assembly 46, used to mount and fix the Mark camera 463, PCB positioning sensor 462, light source assembly mounting box 465, and PCB positioning cylinder 466 to provide a mounting reference for each component. The PCB positioning sensor 462 detects whether the PCB board has reached the designated position in the working area, sending a positioning signal to control the conveyor belt to stop and ensure the PCB board is in place. Accurate positioning is achieved through a Mark camera 463, which captures and identifies Mark points on the PCB board and stencil 331 to obtain their image coordinates for visual alignment and provides data for alignment adjustments. A light source assembly mounting box 465 is used to mount and fix the lower coaxial light source 464, the upper coaxial light source 467, and the beam splitter prism 468, providing a sealed mounting space for the optical components and preventing interference from external light. A PCB positioning cylinder 466 extends its cylinder rod to stop the PCB board from advancing further during board entry, thus stopping the PCB board at a designated position in the work area and achieving machine positioning of the PCB board. Mechanical positioning; the light source assembly mounting box 465 contains a lower-view coaxial light source 464, an upper-view coaxial light source 467, and a beam splitter 468. The lower-view coaxial light source 464 illuminates the Mark points on the PCB board downwards to provide uniform illumination, enabling the Mark camera 463 to clearly identify the Mark points on the PCB board and improve the recognition accuracy. The upper-view coaxial light source 467 illuminates the Mark points on the stencil 331 upwards to provide uniform illumination, enabling the Mark camera 463 to clearly identify the Mark points on the stencil 331 and improve the recognition accuracy. The beam splitter 468 is used to change the light path propagation. The orientation angle enables a single Mark camera 463 to alternately receive reflected light from the lower PCB board and the upper stencil 331 and achieve single-camera dual-target recognition. The beam splitter prism 468 changes the angle of the light path propagation direction so that a single Mark camera 463 can simultaneously recognize Mark points on the PCB board and Mark points on the stencil 331. When the downward-looking coaxial light source 464 is turned on, the Mark camera 463 is in the state of recognizing the Mark points on the PCB board downwards. When the upward-looking coaxial light source 467 is turned on, the Mark camera 463 is in the state of recognizing the Mark points on the stencil 331 upwards.

[0029] PCB work platform assembly 5 includes a base plate 52, a lifting axis stepper motor 51, a horizontal lead screw support 53, a production line drive device 54, a production line width-adjusting axis stepper motor 55, a lifting drive device 56, a processing worktable 57, a PCB top block 58, and a production line assembly 59. The base plate 52 serves as the bottom mounting base for the PCB work platform assembly 5, used to mount the lifting axis stepper motor 51, the horizontal lead screw support 53, the production line drive device 54, and the lifting drive device 56, providing a mounting reference for each sub-component. Below the 2 is a lifting axis stepper motor 51, which provides power output for the lifting movement of the processing worktable 57 to drive the processing worktable 57 to move up and down in the vertical direction and control the lifting height and speed of the PCB board. The base plate 52 is equipped with a horizontal lead screw support seat 53, a production line drive device 54 and a lifting drive device 56. The horizontal lead screw support seat 53 is used to horizontally support the lifting lead screw 562 to ensure the coaxiality and load-bearing capacity of the lifting lead screw 562 and reduce the deflection deformation when the lead screw rotates.

[0030] The assembly line drive device 54 drives the two main aluminum profiles 5910 of the assembly line to move in opposite directions or away from each other to achieve automatic adjustment of the assembly line width and adapt to the conveying requirements of PCB boards of different sizes. The lifting drive device 56 converts the rotational motion of the lifting axis stepper motor 51 into the linear lifting motion of the processing worktable 57 to achieve the lifting action of the PCB board. The lifting drive device 56 includes a lifting synchronous pulley 561, a lifting screw 562, and a lifting nut 563. The lifting synchronous pulley 561 is connected to the lifting axis stepper motor 51 through a synchronous belt to transmit power to the lifting screw 562 and realize the power input for the lifting motion. The lifting screw 562 cooperates with the lifting nut 563 to convert the rotational motion into linear motion and drive the processing worktable. The worktable 57 moves up and down vertically. The lifting nut 563 is used to cooperate with the lifting screw 562 to convert the rotational motion of the screw into the linear lifting motion of the worktable 57. The worktable 57 and the lifting nut 563 are fixedly connected to support the PCB top block 58 and drive the PCB board to rise and fall so that the upper surface of the PCB board coincides with the upper surface of the main aluminum material 5910 of the production line. The lifting shaft stepper motor 51 drives the lifting screw 562 to rotate through the synchronous belt, so that the worktable 57 moves up and down. The PCB top block 58 is attracted to the worktable 57 by a magnet to support the PCB board. The PCB top block 58 is used to support the bottom of the PCB board and lifts the PCB board to the printing height as the worktable 57 rises to ensure that the PCB board is supported flat.

[0031] The assembly line drive device 54 includes an assembly line synchronous pulley 541, a left-hand lead screw 542, a left-hand lead screw nut block 543, a left-hand assembly line mounting block 544, a coupling 545, a right-hand assembly line mounting block 546, a right-hand lead screw nut block 547, a right-hand lead screw 548, and an assembly line slider guide rail 549. One end of the left-hand lead screw 542 is equipped with the assembly line synchronous pulley 541, which is connected to the assembly line width-adjusting axis stepper motor 55 via a synchronous belt to transmit power to the left-hand lead screw 542 and the right-hand lead screw 548. The lead screw 548 provides the power input for the width adjustment motion. The other end of the left-hand lead screw 542 is connected to the right-hand lead screw 548 via a coupling 545. The coupling 545 connects the left-hand lead screw 542 and the right-hand lead screw 548 to ensure synchronous rotation of the two lead screws and to guarantee the synchronicity of the movement of the aluminum body 5910 on both sides of the conveyor line. The left-hand lead screw 542 cooperates with the left lead screw nut block 543 to convert the rotational motion into linear motion and drive the left-hand conveyor line mounting block 544 to move along the conveyor line slider guide rail 549. The lead screw nut block 543 is used to cooperate with the left-hand lead screw 542 to convert the rotational motion of the lead screw into the linear motion of the left-hand assembly line mounting block 544. The left-hand assembly line mounting block 544 is connected to the left lead screw nut block 543 and the slider on the assembly line slider guide rail 549 to install and fix one of the assembly line main aluminum materials 5910 and drive the assembly line main aluminum material 5910 to move along the assembly line slider guide rail 549. The right-hand assembly line mounting block 546 is connected to the right lead screw nut block 547 and the assembly line slider guide rail 549. The slider connection on 9 is used to install and fix another aluminum body 5910 of the production line and drive the aluminum body 5910 of the production line to move along the production line slider guide rail 549. The right lead screw nut block 547 is used to cooperate with the right-hand lead screw 548 to convert the rotational motion of the lead screw into the linear motion of the right-hand production line mounting block 546. The right-hand lead screw 548 is used to cooperate with the right lead screw nut block 547 to convert the rotational motion into linear motion and drive the right-hand production line mounting block 546 to move along the production line slider guide rail 549.

[0032] The assembly line slider guide 549 provides linear motion guidance for the left-hand assembly line mounting block 544 and the right-hand assembly line mounting block 546 to ensure the straightness and stability of the assembly line width adjustment. The assembly line width adjustment axis stepper motor 55 drives the left-hand lead screw 542 and the right-hand lead screw 548 to rotate via a synchronous belt. The assembly line width adjustment axis stepper motor 55 provides power output for the assembly line width adjustment to drive the assembly line drive device 54 through the synchronous belt and control the adjustment amount and speed of the assembly line width, so that the left-hand assembly line mounting block 544 and the right-hand assembly line mounting block 546 move in opposite directions or away from each other along the assembly line slider guide 549, thereby ensuring that the PCB board is always in the middle position.

[0033] The assembly line 59 includes two main aluminum profiles 5910. The assembly line 59 is used to realize the automatic conveying of PCB boards and is divided into three sections: the board inlet area, the working area, and the board outlet area to complete the board inlet and outlet transfer and the working area positioning. Each main aluminum profile 5910 is equally divided into the board inlet area, the working area, and the board outlet area. The main aluminum profile 5910 serves as the main structure of the assembly line 59 and is used to install the conveyor belt, sensors, and drive motors, while also providing side guidance and clamping support for the PCB boards. The board inlet area consists of a PCB board inlet conveyor belt 591, a PCB board inlet material signal sensor 592, a PCB board conveyor belt shaft stepper motor 593, and a PCB board inlet waiting signal sensor 594. The PCB board inlet conveyor belt 591 is used to carry and convey the PCB boards from the board inlet area into the working area to realize the automatic feeding of PCB boards.

[0034] The PCB board feeding signal sensor 592 is used to detect whether a PCB board is placed in the feeding area, sending a feeding signal to trigger the feeding conveyor action and realize automatic board feeding detection. The PCB board conveyor belt shaft stepper motor 593 is used to provide power output to the PCB board feeding conveyor belt 591 to drive the board feeding conveyor belt to move and transport the PCB board, and to control the board feeding speed and start / stop. The PCB board feeding waiting signal sensor 594 is used to detect whether the PCB board has reached the board feeding waiting position to provide signal feedback for board feeding timing control and to ensure the timing coordination of board feeding actions. The working area consists of the working conveyor belt shaft stepper motor 595 and the PCB working conveyor belt 599. The working conveyor belt shaft stepper motor 595 is used to provide power output to the PCB working conveyor belt 599 to drive the working conveyor belt to move and cooperate with the board feeding and board output conveying to complete the position transfer of the PCB board in the working area. The PCB working conveyor belt 599 is used for The PCB board is conveyed and positioned within the working area to coordinate with the board feeding and discharging actions, thus completing the position transfer of the PCB board. The discharging area consists of a PCB board conveyor belt shaft motor 596, a PCB discharging position signal sensor 597, and a PCB discharging conveyor belt 598. The PCB board conveyor belt shaft motor 596 provides power output to the PCB discharging conveyor belt 598 to drive the discharging conveyor belt to send out the printed PCB board and realize the automatic unloading of the PCB board. The PCB discharging position signal sensor 597 detects whether the PCB board has reached the designated position in the discharging area and sends a position signal to control the discharging conveyor belt to stop and ensure that the PCB board is accurately positioned in the discharging area. The PCB discharging conveyor belt 598 carries and conveys the printed PCB board from the working area to the discharging area to wait for the operator to pick it up, thus realizing the automatic unloading of the PCB board. The board feeding area, working area, and discharging area are driven independently.

[0035] The three-degree-of-freedom adjustment assembly 6 includes a UVW mounting platform 61, a U drive motor assembly 62, a V drive motor assembly 63, a W drive motor assembly 64, a U adjustment assembly 65, a V adjustment assembly 66, a W adjustment assembly 67, and a work platform connecting plate 68. The UVW mounting platform 61 serves as the mounting base for the three-degree-of-freedom adjustment assembly 6, fixed on the main worktable 1 to provide mounting reference and support for each drive motor assembly and adjustment assembly. The U drive motor assembly 62 drives the U adjustment assembly 65 to move, thereby achieving displacement adjustment of the PCB work platform assembly 5 in the U direction. The V drive motor assembly 63 drives the V adjustment assembly 66 to move, thereby achieving PCB work platform assembly 67. The platform component 5 is adjusted in the V direction. The W drive motor component 64 is used to drive the W adjustment component 67 to move so as to realize the displacement adjustment of the PCB working platform component 5 in the W direction. The U drive motor component 62 includes a UVW drive motor 621, a drive motor nut 622, a drive motor mounting base 623, and a drive motor chain block 624. The UVW drive motor 621 is used to provide power output for the adjustment movement in the U, V, and W directions to accurately control the displacement in each direction and ensure the accuracy of the alignment adjustment. The drive motor nut 622 cooperates with the output shaft lead screw of the UVW drive motor 621 to convert the rotational motion into linear motion to drive the adjustment component to move.

[0036] The drive motor chain block 624 is used to connect the drive motor nut 622 and the lower guide rail slider mounting aluminum block 652 to transmit the linear thrust of the drive motor to the adjustment assembly and realize the power transmission. The U drive motor assembly 62, V drive motor assembly 63, and W drive motor assembly 64 are respectively connected to the main worktable 1 through the drive motor mounting base 623. The drive motor mounting base 623 is used to fix the UVW drive motor 621 on the main worktable 1 to provide stable mounting support for the drive motor and ensure the coaxiality of the motor output shaft. The U adjustment assembly 65, V adjustment assembly... Adjustment components 66 and 67 are connected to the main worktable 1 via the UVW lower guide rail slider 651. Adjustment component 65, driven by the U drive motor assembly 62, generates a U-direction displacement to cooperate with adjustment components 66 and 67 in achieving three-degree-of-freedom adjustment of X, Y, and angle. Adjustment component 66, driven by the V drive motor assembly 63, generates a V-direction displacement to cooperate with adjustment components 65 and 67 in achieving three-degree-of-freedom adjustment of X, Y, and angle. Adjustment component 67, driven by the W drive motor assembly 64, generates a W-direction displacement to cooperate with adjustment components 66 and 67 in achieving three-degree-of-freedom adjustment of X, Y, and angle. Adjustment component 65 and V-adjustment component 66 together achieve three-degree-of-freedom adjustment of X, Y, and angle. Above the UVW lower guide rail slider 651 of each adjustment component are sequentially mounted a lower guide rail slider mounting aluminum block 652, a crossed roller bearing 653, an upper guide rail slider mounting aluminum block 654, and a UVW upper guide rail slider 655. The UVW lower guide rail slider 651 is mounted on the main worktable 1 to provide linear motion guidance for the lower guide rail slider mounting aluminum block 652, ensuring the straightness and stability of the adjustment motion. The lower guide rail slider mounting aluminum block 652 is mounted above the UVW lower guide rail slider 651 and can... The lower guide rail slider slides back and forth to support the crossed roller bearing 653 and the upper component, serving as the lower support structure of the adjustment assembly. The crossed roller bearing 653 is installed between the lower guide rail slider mounting aluminum block 652 and the upper guide rail slider mounting aluminum block 654 to allow the upper and lower parts to rotate relative to each other to achieve the angle adjustment function and simultaneously bear radial and axial loads. The upper guide rail slider mounting aluminum block 654 is installed above the crossed roller bearing 653 to support the UVW upper guide rail slider 655 and can rotate relative to the lower guide rail slider mounting aluminum block 652 to serve as the upper support structure of the adjustment assembly.

[0037] The UVW upper guide rail slider 655 is mounted above the upper guide rail slider mounting aluminum block 654 and connected to the work platform connecting plate 68 to provide linear motion guidance for the upper PCB work platform assembly 5 to ensure smooth adjustment movement. The work platform connecting plate 68 is connected to the UVW upper guide rail slider 655 and fixed to the base plate 52 above it to transmit the adjustment movement of the three-degree-of-freedom adjustment component 6 to the PCB work platform assembly 5 to drive the PCB work platform assembly 5 to shift as a whole and achieve alignment adjustment. The three-degree-of-freedom adjustment component 6 is used to adjust the X-direction deviation, Y-direction deviation and angular deviation of the PCB work platform assembly 5.

[0038] Working principle: The equipment returns to the origin, the printing component 3 is in the image acquisition position, and the stencil 331 is placed on the frame component 33. The width parameter of the PCB board is input via the display touchscreen 13, the width adjustment axis stepper motor 55 starts, and drives the production line drive device 54 through the synchronous belt, causing the two main aluminum profiles 5910 of the production line assembly 59 to move in opposite directions along the production line slider guide rail 549. When the distance between them reaches the set PCB board width, the width adjustment axis stepper motor 55 stops. The PCB board is placed in the board feeding area of ​​the production line assembly 59, and the PCB board feeding signal sensor 592 detects the presence of a board.

[0039] The system calculates the target position coordinates that the camera X-beam assembly 4 needs to move to based on the PCB length by inputting the PCB length through the touch screen 13. Driven by the camera Y-axis servo motor 341, the camera X-beam assembly 4 moves along the camera Y-axis guide rail 35 to the designated position via the camera Y-axis lead screw 343. Simultaneously, the camera X-axis drive device 45 moves the camera assembly 46 along the camera X-axis slider guide rail 44 to the corresponding coordinates via the camera X-axis lead screw 452. Then, the PCB positioning cylinder 466 opens, the cylinder rod extends, and the system sends a board request signal. 4. The PCB conveyor belt stepper motor 593 and the working conveyor belt stepper motor 595 start simultaneously, driving the PCB feeding conveyor belt 591 and the PCB working conveyor belt 599 to move, respectively, moving the PCB from the feeding area to the working area. When the front end of the PCB touches the extended cylinder rod of the PCB positioning cylinder 466, it cannot continue moving forward. At the same time, the PCB positioning sensor 462 detects the PCB positioning signal, and the conveyor belt stops.

[0040] The lifting axis stepper motor 51 starts, driving the lifting synchronous pulley 561 and lifting lead screw 562 to rotate via the synchronous belt. This causes the lifting nut 563 to lift the processing table 57 vertically, and the PCB top block 58 on the processing table 57 lifts synchronously against the PCB board. When the upper surface of the PCB board coincides with the upper surface of the main aluminum material 5910 of the production line, the lifting axis stepper motor 51 stops. Subsequently, the production line width adjustment axis stepper motor 55 starts again, driving the left-hand lead screw 542 and right-hand lead screw 548 to rotate. This causes the left-hand production line mounting block 544 and right-hand production line mounting block 546 to move in opposite directions along the production line slider guide rail 549. The two main aluminum materials 5910 of the production line move in opposite directions accordingly, clamping the PCB board from both sides.

[0041] Setting PCB Board Mark Points: Printed circuit assembly 3 remains in the image-capturing position. Camera assembly 46 moves in the XY plane above the first PCB board mark point. The downward-looking coaxial light source 464 illuminates the mark point. The reflected light from the mark point passes through a beam splitter prism 468, changing its optical path direction before entering the mark camera 463. At this time, the mark camera 463 is in a downward-facing state for identifying PCB board mark points, and the system records the X and Y coordinates of that mark point. Typically, two diagonally opposite mark points on the PCB board are selected, and camera assembly 46 moves to above the second mark point, repeating the above identification process.

[0042] Setting the Mark Point on Stencil 331: After the PCB board Mark points are recorded, turn off the lower coaxial light source 464 and turn on the upper coaxial light source 467. Keep the camera assembly 46 stationary. Manually move the stencil 331 so that the Mark point on the stencil 331 is centered in the image of the Mark camera 463. Tighten the mesh locking nut 332 on the mesh frame assembly 33 to fix the stencil 331. The reflected light from the Mark point on the stencil 331 enters the Mark camera 463 after the beam splitter prism 468 changes the light path direction. At this time, the Mark camera 463 is in the state of upward recognition of the Mark point on the stencil 331, and the system records the X and Y coordinates of the Mark point. After recognition is completed, the camera beam assembly 4 and the camera assembly 46 return to their original positions.

[0043] The system calculates the angular and positional deviations between the recorded X and Y coordinates of the stencil 331 Mark point and the PCB board Mark point. The three-degree-of-freedom adjustment assembly 6 is activated, and the U-drive motor assembly 62, V-drive motor assembly 63, and W-drive motor assembly 64 drive the U-adjustment assembly 65, V-adjustment assembly 66, and W-adjustment assembly 67 respectively via the UVW-drive motor 621. This causes the working platform connecting plate 68 and the PCB working platform assembly 5 above it to shift as a whole, making the coordinates of the PCB board Mark point coincide with the coordinates of the stencil 331 Mark point.

[0044] The Z-axis servo motor 21 starts, driving the Z-axis slider mounting plate 27 downward along the Z-axis slider guide rail 26 via the Z-axis lead screw module 23. The printing assembly 3 fixed on the Z-axis slider mounting plate 27 moves downward synchronously, so that the lower surface of the stencil 331 in the stencil frame assembly 33 completely overlaps with the upper surface of the aluminum material 5910 of the production line body in the PCB work platform assembly 5. The squeegee assembly 32 starts working. The squeegee shaft stepper motor 371 drives the squeegee shaft mounting plate 374 to slide back and forth along the squeegee main shaft 37 via the squeegee shaft synchronous belt 372 and the squeegee shaft synchronous pulley 373. The front squeegee cylinder 321 drives the front squeegee blade 3211 to press down or the rear squeegee cylinder 322 drives the rear squeegee blade 3221 to press down, scraping solder paste onto the stencil 331 from left to right or from right to left.

[0045] After printing is complete, the Z-axis servo motor 21 rotates in reverse, and the printing assembly 3 moves upward and returns to its original position. The lifting axis stepper motor 51 starts in reverse, driving the processing table 57 downward through the lifting drive device 56, and the PCB board falls back onto the PCB working conveyor belt 599. The working conveyor belt axis stepper motor 595 and the PCB board conveyor belt axis motor 596 start, driving the PCB working conveyor belt 599 and the PCB board output conveyor belt 598 to operate respectively. The PCB board moves from the working area to the output area. When the PCB board output arrival signal sensor 597 detects that the PCB board has arrived, the conveyor belt stops, and the PCB board waits to be picked up in the output area. This is a complete printing cycle. The above steps are repeated to achieve continuous automatic printing.

Claims

1. An automatic screen printing table, comprising a main worktable (1), a Z-axis assembly (2), a printing assembly (3), a camera X-beam assembly (4), a PCB work platform assembly (5), and a three-degree-of-freedom adjustment assembly (6), characterized in that: The Z-axis assembly (2) is fixed on the main worktable (1). The Z-axis assembly (2) is provided with a Z-axis slider mounting plate (27) that can move up and down in the vertical direction. The printing assembly (3) is fixed on the Z-axis slider mounting plate (27) and moves up and down with it. The PCB work platform assembly (5) is set on the main worktable (1) through a three-degree-of-freedom adjustment assembly (6). The PCB work platform assembly (5) includes a lifting processing worktable (57) and a PCB top block (58) set on the processing worktable (57). During printing, the Z-axis assembly (2) drives the stencil (331) in the printing assembly (3) to descend to overlap with the upper surface of the main aluminum material (5910) of the PCB work platform assembly (5). At the same time, the processing worktable (57) drives the PCB top block (58) to rise so that the upper surface of the PCB board overlaps with the upper surface of the main aluminum material (5910) of the PCB board, thereby realizing the bonding printing of the stencil (331) and the PCB board.

2. The automatic screen printing table according to claim 1, characterized in that: The Z-axis assembly (2) includes a Z-axis servo motor (21), a Z-axis mounting plate (22), a Z-axis lead screw module (23), a Z-axis column (24), a Z-axis guide rail mounting plate (25), a Z-axis slider guide rail (26), and a Z-axis slider mounting plate (27). The Z-axis servo motor (21) is mounted below the Z-axis mounting plate (22), the Z-axis guide rail mounting plate (25) is mounted above the Z-axis mounting plate (22), and the two Z-axis columns (24) are respectively mounted on both sides of the Z-axis guide rail mounting plate (25) and simultaneously connected to it. The Z-axis mounting plate (22) is fixedly connected, the Z-axis slider guide rail (26) is mounted on the Z-axis guide rail mounting plate (25) and is parallel to each other, the Z-axis slider mounting plate (27) is fixedly connected to the slider on the Z-axis slider guide rail (26) and can move up and down in the vertical direction, the screw nut of the Z-axis screw module (23) is fixedly connected to the Z-axis slider mounting plate (27) and one end of the screw is connected to the Z-axis servo motor (21), the Z-axis servo motor (21) rotates to drive the Z-axis slider mounting plate (27) to move up and down along the Z-axis slider guide rail (26).

3. An automatic screen printing table according to claim 1, characterized in that: The printing assembly (3) includes a printing beam (31), a squeegee assembly (32), a screen frame assembly (33), a camera Y-axis drive device (34), and a squeegee spindle (37). The printing beam (31) is fixed on the Z-axis slider mounting plate (27), the screen frame assembly (33) is mounted on the printing beam (31), the steel mesh (331) is placed on the screen frame assembly (33) and fixed by the screen locking nut (332), the squeegee spindle (37) is mounted on the printing beam (31), and the squeegee assembly (32) is mounted on the squeegee shaft mounting plate (374) of the squeegee spindle (37) and can slide back and forth along the squeegee spindle (37). The printing beam (31) is equipped with camera Y-axis rail mounting plates (36) on both sides. Camera Y-axis rails (35) are mounted on the camera Y-axis rail mounting plates (36). One of the camera Y-axis rail mounting plates (36) is equipped with a camera Y-axis drive device (34).

4. An automatic screen printing table according to claim 3, characterized in that: The scraper assembly (32) consists of a front scraper cylinder (321) and a rear scraper cylinder (322), with a front scraper blade (3211) and a rear scraper blade (3221) respectively mounted on the front scraper cylinder (321) and the rear scraper cylinder (322). The scraper spindle (37) consists of a scraper spindle stepper motor (371), a scraper spindle timing belt (372), a scraper spindle timing wheel (373), and a scraper spindle mounting plate (374). The scraper spindle stepper motor (371) drives the scraper spindle mounting plate (374) to slide back and forth on the scraper spindle (377) through the scraper spindle timing belt (372) and the scraper spindle timing wheel (373), thereby driving the front scraper blade (3211) and the rear scraper blade (3221) to slide back and forth on the steel mesh (331).

5. An automatic screen printing table according to claim 1, characterized in that: The camera X-beam assembly (4) includes a camera X-beam body (43), a camera X-axis slider guide rail (44), a camera X-axis drive device (45), and a camera assembly (46). A camera Y-axis connecting block (41) is mounted on each side of the camera X-beam body (43). The camera Y-axis connecting block (41) is connected to a camera X-axis connecting block (342) on the printing assembly (3). The camera Y-axis connecting block (41) is equipped with a camera Y-axis slider (42) and can slide back and forth along the camera Y-axis guide rail (35). The servo motor (341) drives the camera X-beam body (43) to move along the camera Y-axis guide rail (35) via the camera Y-axis lead screw (343); the camera X-axis slider guide rail (44) and the camera X-axis drive device (45) are installed above the camera X-beam body (43), the camera assembly (46) is installed on the camera X-axis slider guide rail (44) and fixedly connected to the camera body assembly connecting block (451), and the camera X-axis drive device (45) drives the camera assembly (46) to slide back and forth along the camera X-axis slider guide rail (44).

6. An automatic screen printing table according to claim 5, characterized in that: The camera assembly (46) includes a camera mounting plate (461), a PCB positioning sensor (462), a Mark camera (463), a light source assembly mounting box (465), and a PCB positioning cylinder (466). The light source assembly mounting box (465) contains a lower-viewing coaxial light source (464), an upper-viewing coaxial light source (467), and a beam splitter (468). The beam splitter (468) changes the angle of the light path propagation direction, so that a single Mark camera (463) can simultaneously identify the Mark points on the PCB board and the Mark points on the stencil (331). When the lower-viewing coaxial light source (464) is turned on, the Mark camera (463) is in the state of identifying the Mark points on the PCB board downwards. When the upper-viewing coaxial light source (467) is turned on, the Mark camera (463) is in the state of identifying the Mark points on the stencil (331) upwards.

7. An automatic screen printing table according to claim 1, characterized in that: The PCB work platform assembly (5) includes a base plate (52), a lifting axis stepper motor (51), a production line drive device (54), a production line width-adjusting axis stepper motor (55), a lifting drive device (56), a processing worktable (57), a PCB top block (58), and a production line assembly (59). The lifting axis stepper motor (51) is mounted below the base plate (52), and the production line drive device (54) and the lifting drive device (56) are mounted on the base plate (52). The lifting drive device (56) includes a lifting synchronous wheel (561), a lifting screw (562), and a lifting nut (563). The processing worktable (57) is fixedly connected to the lifting nut (563). The lifting axis stepper motor (51) drives the lifting screw (562) to rotate through the synchronous belt, causing the processing worktable (57) to move up and down. The PCB top block (58) is attracted to the processing worktable (57) by a magnet to support the PCB board.

8. An automatic screen printing table according to claim 7, characterized in that: The assembly line drive device (54) includes an assembly line synchronous pulley (541), a left-hand lead screw (542), a left-hand lead screw nut block (543), a left-hand assembly line mounting block (544), a coupling (545), a right-hand assembly line mounting block (546), a right-hand lead screw nut block (547), a right-hand lead screw (548), and an assembly line slider guide rail (549). One end of the left-hand lead screw (542) is equipped with the assembly line synchronous pulley (541), and the other end is connected to the right-hand lead screw (548) through the coupling (545). The left-hand assembly line mounting block (544) is connected to the left-hand lead screw (548) through the coupling (545). The lead screw nut block (543) is connected to the slider on the assembly line slider guide rail (549), and the right-hand assembly line mounting block (546) is connected to the right lead screw nut block (547) and the slider on the assembly line slider guide rail (549). The assembly line width-adjusting shaft stepper motor (55) drives the left-hand lead screw (542) and the right-hand lead screw (548) to rotate through the synchronous belt, so that the left-hand assembly line mounting block (544) and the right-hand assembly line mounting block (546) move towards each other or away from each other along the assembly line slider guide rail (549), thereby ensuring that the PCB board is always in the middle position.

9. An automatic screen printing table according to claim 7, characterized in that: The assembly line (59) includes two main aluminum profiles (5910), each of which is divided into three sections: an infeed area, a working area, and an outfeed area. The infeed area consists of a PCB infeed conveyor belt (591), a PCB infeed material signal sensor (592), a PCB conveyor belt shaft stepper motor (593), and a PCB infeed waiting signal sensor (594). The working area consists of a working conveyor belt shaft stepper motor (595) and a PCB working conveyor belt (599). The outfeed area consists of a PCB conveyor belt shaft motor (596), a PCB outfeed arrival signal sensor (597), and a PCB outfeed conveyor belt (598). The infeed area, working area, and outfeed area are driven independently.

10. An automatic screen printing table according to claim 1, characterized in that: The three-degree-of-freedom adjustment assembly (6) includes a UVW mounting platform (61), a U drive motor assembly (62), a V drive motor assembly (63), a W drive motor assembly (64), a U adjustment assembly (65), a V adjustment assembly (66), a W adjustment assembly (67), and a work platform connecting plate (68). The UVW mounting platform (61) is fixed on the main worktable (1). The U drive motor assembly (62), V drive motor assembly (63), and W drive motor assembly (64) are respectively connected to the main worktable (1) through drive motor mounting bases (623). The U adjustment assembly (65), V adjustment assembly (66), and W adjustment assembly (67) are connected to the main worktable (1) through drive motor mounting bases (623). 66) and W adjustment components (67) are connected to the main worktable (1) via UVW lower guide rail slider (651); each adjustment component has a lower guide rail slider mounting aluminum block (652), a cross roller bearing (653), an upper guide rail slider mounting aluminum block (654) and a UVW upper guide rail slider (655) mounted on its UVW lower guide rail slider (651) in sequence; the work platform connecting plate (68) is connected to the UVW upper guide rail slider (655) and fixed to the base plate (52) above it; the three-degree-of-freedom adjustment component (6) is used to adjust the X-direction deviation, Y-direction deviation and angle deviation of the PCB work platform component (5).

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