A screen printing device for processing a circuit board

Abstract

The present application relates to the technical field of silk screen printing machine, in particular to a silk screen printing device for circuit board processing. The switching mechanism includes electric sliding rails symmetrically arranged between the two sides of the moving frame, a cross beam is arranged between the sliding blocks of the two electric sliding rails, air cylinders are symmetrically installed on the cross beam, and a pushing frame is symmetrically and slidably arranged on the cross beam, the pushing frame is connected with the telescopic end of the adjacent air cylinder, and a turning frame is rotatably arranged at each end of the pushing frame, and a scraper is arranged on the turning frame. By setting the switching mechanism and the cleaning mechanism, the scraper for ink returning and scraping treatment can be quickly replaced during the silk screen printing operation, and the cleaning mechanism is started at the same time of completing the scraper replacement, the old scraper is soaked and cleaned, and the surface is wiped, the residual ink is effectively removed, the scraper has good flatness and contact effect when used again, so that the automatic cleaning function is integrated on the basis of the automatic scraper replacement, and the printing precision and consistency are further improved.

Description

Technical Field

[0001] This invention relates to the field of screen printing machine technology, and more specifically to a screen printing device for circuit board processing. Background Technology

[0002] Screen printing on printed circuit boards (PCBs) is a crucial process in PCB manufacturing where text, symbols, and graphics are printed onto the surface of the PCB, providing essential guidance for subsequent assembly, debugging, and maintenance. Existing screen printing equipment typically operates by raising and lowering the screen printing frame to align with or move away from the PCB on the mounting table to complete the printing operation.

[0003] Before attaching the screen printing frame to the circuit board, a back-inking knife is usually used to gently attach the screen printing frame, spreading the ink evenly on the screen without applying additional pressure. Then, after the screen printing frame is tightly attached to the circuit board, a certain pressure is applied downwards by a squeegee, so that the ink passes through the screen holes under pressure and is evenly transferred to the surface of the circuit board to achieve the printing effect.

[0004] However, during prolonged continuous operation, the ink's fluidity gradually decreases due to prolonged exposure to air, causing moisture to evaporate. Factors such as high ambient temperature and humidity, or the ink remaining stationary during production interruptions, also contribute to this decrease, leading to localized solidification. This solidification often occurs on the surfaces of the ink return blade and doctor blade, causing lumps and protrusions at their contact surfaces, damaging the originally smooth ink-scraping surface. When the surface of the ink return blade or doctor blade becomes rough, uneven ink distribution and ink breaks are likely to occur in subsequent printing processes, affecting print quality and equipment lifespan. Currently, the industry commonly addresses this issue by stopping the machine and manually cleaning the relevant components. However, this method is not only cumbersome but also inevitably causes production line interruptions, reducing overall production efficiency.

[0005] To address this, a screen printing device for circuit board processing was specially designed, which has the ability to perform real-time maintenance on the ink return blade and doctor blade during operation and integrates an automatic cleaning function to maintain the flatness of the ink scraping surface and the stability of printing quality, thereby improving equipment operating efficiency and product yield. Summary of the Invention

[0006] In order to overcome the shortcomings of the existing technology, the present invention provides a screen printing device for circuit board processing that has the ability to perform real-time maintenance on the ink return blade and the doctor blade during operation and integrates an automatic cleaning function.

[0007] The technical solution is as follows: A screen printing device for circuit board processing, comprising:

[0008] Workbench;

[0009] The lifting platform is located at the rear of the workbench. It has movable ends on both sides, and each movable end is equipped with a movable frame. Each movable frame is equipped with a mounting component, and the mounting components on both sides are used to place the screen printing frame body.

[0010] The switching mechanism includes electric slide rails symmetrically arranged between two movable frames. A crossbeam is arranged between the sliders of the two electric slide rails. Cylinders with their telescopic ends facing upwards are symmetrically installed on the crossbeam. Push frames are also symmetrically slidably passed through the crossbeam. The push frames are connected to the telescopic ends of adjacent cylinders. A drive motor is installed at one end of the lower part of each push frame. The two drive motors are distributed opposite to each other. A toggle frame is rotatably arranged at each end of the push frame. A drive gear is arranged at the shaft end of the toggle frame located below the drive motor. The drive gear is connected to the output end of the drive motor on the same side. The shaft ends of the other two toggle frames are equipped with driven gears. The driven gears mesh with the drive gears on the same side. A scraper is arranged on each toggle frame. The scrapers on both sides are used for ink return and ink scraping, respectively.

[0011] The cleaning mechanism, symmetrically arranged between the movable frames, is used for cleaning by the scraper.

[0012] Furthermore, the mounting components include mounting frames and fixing bolts. Mounting frames are provided on opposite sides of both movable frames. The mounting frames on both sides are used to place the screen printing frame body, and fixing bolts are threaded on the mounting frames to abut and fix the position of the screen printing frame body.

[0013] Furthermore, the cleaning mechanism includes connectors at the front and rear ends of the mobile frame, a processing frame between two opposite connectors, an inlet pipe and a drain pipe on each side of the processing frame, a set of support rods on both the left and right sides inside the processing frame, a rotating rod on each support rod, an elastic element 2 between the rotating rod and the corresponding support rod, and a wiping element between two opposite rotating rods.

[0014] Furthermore, the connector includes mounting plates disposed at the ends of the two movable frames, and symmetrically arranged on the processing frame are locking blocks adapted to the layout of the mounting plates, the locking blocks slidingly engaging with the corresponding mounting plates.

[0015] Furthermore, it also includes limiting components, which include multiple inclined plates set on the electric slide rail sliders on both sides. Both ends of the push frame are slidably provided with abutment frames. Both sides of the abutment frames have protruding ends that contact and abut with the inclined plates on the same side. An elastic element is provided between the abutment frame and the inner wall of the corresponding push frame. The end of the push frame is provided with an extension plate that abuts with the corresponding abutment frame.

[0016] Furthermore, it also includes a concentrating mechanism, which includes electric push rods respectively mounted on the mounting frames on both sides, and an arc-shaped plate for pushing the ink to concentrate is provided on the telescopic end of the electric push rod.

[0017] Furthermore, the central mechanism also includes a limiting plate, an arc-shaped plate that is slidably connected to the telescopic end of the corresponding electric push rod, and limiting plates that are hinged to both ends of the arc-shaped plate and fit against the mounting frame on the same side.

[0018] Furthermore, it also includes a positioning mechanism, which includes a guide plate set on the workbench, a placement plate slidably set on the guide plate, a right-angled plate arranged circumferentially on the placement plate, and collars that abut and fit with the placement plate slidably set on both sides of the guide plate.

[0019] The beneficial effects are as follows: 1. This invention, by setting up a switching mechanism and a cleaning mechanism, enables rapid replacement of the doctor blades used for ink return and scraping during screen printing. This structure utilizes a drive motor to provide power, and through the meshing of the drive gear and driven gear, it drives two sets of doctor blades to rotate and replace them rapidly. Simultaneously with the doctor blade replacement, the cleaning mechanism starts to soak, clean, and wipe the surface of the old doctor blade, effectively removing residual ink and ensuring that the doctor blade has good flatness and contact effect when reused. This achieves automatic doctor blade replacement and integrates automated cleaning, avoiding downtime losses caused by traditional manual disassembly and cleaning, significantly improving the continuous operation capability and production efficiency of the equipment, thereby further enhancing printing accuracy and consistency.

[0020] 2. The limiting component in this invention includes components such as an inclined plate, a stop frame, an elastic component, and an extension plate. These components work together to automatically release the limiting constraint before the squeegee is switched. After the switch is completed, the new squeegee is re-secured, effectively preventing the squeegee instability caused by loose connection. This enhances the operational safety and stability of the entire system and ensures the continuity and reliability of the screen printing process.

[0021] 3. The present invention also includes a concentrating mechanism, which uses an electric push rod to drive an arc plate to push and concentrate the ink spilled and residual on the screen printing frame, thereby reducing ink waste and improving the cleanliness of the overall working environment and the sustainability of production.

[0022] 4. This invention ensures precise positioning of the four corners of the circuit board body by using a guide plate, a placement plate, and a right-angle plate in combination. At the same time, the collar structure further restricts the movement of the placement plate, keeping the circuit board stable during the printing process, effectively improving the positional accuracy during printing, thereby enhancing product consistency and yield, and meeting the requirements of high-quality screen printing processes. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the assembly structure of the present invention.

[0024] Figure 2 This is a three-dimensional structural diagram of some components of the switching mechanism of the present invention.

[0025] Figure 3 This is a three-dimensional structural diagram of the components of the present invention, such as the movable frame, mounting frame, and fixing bolts.

[0026] Figure 4 This is a three-dimensional structural diagram of the driven gear, actuating frame, and scraper components of the present invention.

[0027] Figure 5 This is a three-dimensional structural diagram of the components of the present invention, such as the push frame, drive motor, and drive gear.

[0028] Figure 6 This is a three-dimensional structural diagram of the components of the limiting member of the present invention.

[0029] Figure 7 This is a three-dimensional structural diagram of the various components of the cleaning mechanism of the present invention.

[0030] Figure 8 For the present invention Figure 7 An enlarged schematic diagram of part A in the middle.

[0031] Figure 9 For the present invention Figure 7 Enlarged diagram of part B.

[0032] Figure 10 This is a three-dimensional structural diagram of the components of the central mechanism of the present invention.

[0033] Figure 11 This is a three-dimensional structural diagram of the components of the positioning mechanism of the present invention.

[0034] Component names and serial numbers in the diagram: 100. Circuit board body; 101. Silkscreen frame body; 1. Workbench; 2. Lifting platform; 21. Moving frame; 22. Mounting frame; 23. Fixing bolt; 3. Switching mechanism; 31. Electric slide rail; 32. Crossbeam; 33. Cylinder; 34. Push frame; 35. Drive motor; 36. Drive gear; 37. Driven gear; 38. Actuating frame; 39. Scraper; 4. Limiting component; 41. Inclined plate; 42. 43. Support frame, 44. Elastic component one, 5. Extension plate, 6. Cleaning mechanism, 50. Mounting plate, 51. Processing frame, 511. Locking block, 52. Water inlet pipe, 53. Drain pipe, 54. Support rod, 55. Rotating rod, 56. Wiping component, 57. Elastic component two, 6. Centralizing mechanism, 61. Electric push rod, 62. Arc plate, 63. Limiting plate, 74. Positioning mechanism, 75. Guide plate, 76. Placement plate, 77. Right angle plate, 78. Collar. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0036] Example: A screen printing device for circuit board processing, such as... Figures 1-9 As shown, it includes:

[0037] Workbench 1 serves as the basic support platform for the entire device, used to support the required components and to place the circuit board body 100.

[0038] The lifting platform 2 is located on the rear side of the workbench 1. It has movable ends on both sides, and movable frames 21 are provided on both movable ends. Mounting components are provided on both movable frames 21. The mounting components on both sides are used to support and restrict the placement of the screen printing frame body 101. The lifting platform 2 controls the contact and separation between the screen printing frame body 101 and the circuit board body 100 through vertical movement, thereby realizing the start and stop control of the printing action.

[0039] The switching mechanism 3 includes electric slide rails 31 symmetrically arranged between the two movable frames 21. A crossbeam 32 is arranged between the sliders of the two electric slide rails 31. Cylinders 33 with their telescopic ends facing upwards are symmetrically installed on the crossbeam 32. Push frames 34 are also symmetrically slidably mounted on the crossbeam 32. The push frames 34 can slide up and down along the crossbeam 32. The push frames 34 are connected to the telescopic ends of the adjacent cylinders 33. A drive motor 35 is installed at one end of the lower part of the push frame 34. The machine 35 is arranged in a front-to-back arrangement, and a toggle frame 38 is rotatably mounted at the front and rear ends of the push frame 34. The shaft end of the toggle frame 38 located below the drive motor 35 is provided with a drive gear 36, which is connected to the output end of the drive motor 35 on the same side. The shaft ends of the other two toggle frames 38 are provided with driven gears 37, which mesh with the drive gears 36 on the same side. Scraper blades 39 are fixedly mounted at the bottom of the toggle frames 38, and the scraper blades 39 on both sides are used for ink return and ink scraping respectively.

[0040] Furthermore, the switching mechanism 3 drives the crossbeam 32 to move laterally via the electric slide rail 31, causing the squeegee 39 to slide along the surface of the screen printing frame body 101 to spread the ink. At the same time, the cylinder 33 drives the push frame 34 to move up and down, realizing the contact and disengagement of the squeegee 39 with the screen printing frame body 101. The drive motor 35 drives the drive gear 36 to rotate, and through the meshing transmission with the driven gear 37, drives the actuating frame 38 to rotate, thereby realizing the position switching between the squeegees 39. The two are used alternately, which can realize rapid replacement without stopping the machine, thus presenting a more continuous printing process.

[0041] It is evident that this mechanism enables the automatic lifting, rotation, and switching of the scraper 39. Its compact structure and coordinated movements significantly improve the automation level and work efficiency of the equipment, reduce the frequency of manual intervention, and enhance the consistency of printing results.

[0042] The cleaning mechanism 5 is symmetrically arranged between the movable frames 21. The cleaning mechanism 5 can automatically clean and wipe the surface of the scraper 39 while replacing it, effectively removing the attached ink and ensuring the flatness and contact of the scraper 39 when it is reused, thereby improving the stability of printing quality.

[0043] like Figure 2 , Figure 3 and Figure 10 As shown, the mounting component includes a mounting frame 22 and a fixing bolt 23. The mounting frame 22 is fixedly installed on the opposite side of the two movable frames 21. The two mounting frames 22 cooperate with each other to support and position the screen printing frame body 101. The front and rear sides of the mounting frame 22 are threaded with fixing bolts 23 for abutting and fixing the position of the screen printing frame body 101. By rotating the fixing bolt 23, its end can be screwed toward the screen printing frame body 101 to achieve abutting and fixing of the screen printing frame body 101.

[0044] like Figure 7 and Figure 9 As shown, the cleaning mechanism 5 includes connectors at both ends of the movable frame 21. A processing frame 51 is installed between two opposite connectors on the left and right sides. The overall length of the processing frame 51 is greater than the overall stroke of each electric slide rail 31, ensuring that the scraper 39 can remain stably submerged inside the processing frame 51 during subsequent use, thereby achieving continuous and effective cleaning. A water inlet pipe 52 and a drain pipe 53 are respectively provided on both sides of the processing frame 51. Valves for controlling the opening and closing of the water inlet pipe 52 and the drain pipe 53 are installed on both to allow for the input and output of cleaning fluid, ensuring the circulation of the cleaning fluid. In the ring update, a set of support rods 54 with front and rear spacing are provided on both the left and right sides inside the processing frame 51. Rotating rods 55 are rotatably mounted on each support rod 54. An elastic element 57 is provided between the rotating rod 55 and the corresponding support rod 54. In this embodiment, the elastic element 57 is a spring to provide appropriate restoring force and ensure that the corresponding rotating rod 55 rotates stably. A wiping element 56 is provided between the two opposite rotating rods 55. When the scraper 39 rises from the processing frame 51, it will pass between the wiping elements 56 to effectively remove the ink on the surface of the scraper 39 after use.

[0045] like Figure 7 and Figure 8 As shown, the connector includes a mounting plate 50 fixedly installed at the ends of the two movable frames 21. The mounting plate 50 has a T-shaped groove. The processing frame 51 is symmetrically provided with a locking block 511 that matches the layout of the mounting plate 50. The locking block 511 slides and abuts against the corresponding mounting plate 50. The processing frame 51 can be quickly installed and disassembled by sliding up and down. This connection method not only facilitates assembly and maintenance, but also ensures the overall stability of the cleaning mechanism 5 during operation.

[0046] like Figure 6As shown, it also includes a limiting member 4, which includes three inclined plates 41 disposed on the sliders of the electric slide rails 31 on both sides. The front and rear ends of the push frame 34 are slidably provided with abutment frames 42. The left and right sides of the abutment frames 42 have protruding ends that contact and abut with the inclined plates 41 on the same side. An elastic element 43 is disposed between the abutment frame 42 and the inner wall of the corresponding push frame 34. In this embodiment, the elastic element 43 is a spring. The end of the push frame 34 is fixedly provided with an extension plate 44 that abuts with the corresponding abutment frame 42. The function of the limiting member 4 is to limit the position of the scraper 39 in the use state, and to realize the automatic limiting and release of the scraper 39 and the extension plate 44 when the inclined plates 41 contact the corresponding abutment frames 42.

[0047] like Figure 10 As shown, it also includes a concentrating mechanism 6, which includes electric push rods 61 respectively installed on the mounting frames 22 on both sides. An arc plate 62 is provided on the telescopic end of the electric push rod 61. The arc plate 62 can fit the internal contour of the screen printing frame body 101 to ensure that the dispersed ink is effectively pushed to the central area during the movement.

[0048] like Figure 10 As shown, the central mechanism 6 also includes a limiting plate 63. The arc plate 62 is slidably connected to the telescopic end of the corresponding electric push rod 61, so that the arc plate 62 can slide up and down. The front and rear ends of the arc plate 62 are hinged with limiting plates 63 that abut against the mounting frame 22 on the same side. By pushing the arc plate 62 upward and rotating the limiting plate 63 to abut against the mounting frame 22, the position of the arc plate 62 and the screen printing frame body 101 is effectively ensured, so that the two are separated, so that the screen printing frame body 101 can be replaced in the future.

[0049] like Figure 11 As shown, it also includes a positioning mechanism 7, which includes a guide plate 71 set on the worktable 1, a placement plate 72 slidably set on the guide plate 71, a right-angle plate 73 arranged circumferentially on the placement plate 72, and collars 74 slidably set on the left and right sides of the guide plate 71 to abut and fit with the placement plate 72. The collars 74 play a limiting role. After the placement plate 72 is in place, it can be locked by the collars 74 to avoid unnecessary movement during the printing process.

[0050] During use, first ensure the device is placed stably. Next, push the two side collars 74 to release the restriction on the placement plate 72, then slide the placement plate 72 forward along the guide plate 71. Place the circuit board body 100 to be screen-printed onto the placement plate 72, aligning the four corners of the circuit board body 100 with the corresponding right-angle plates 73. After positioning, push the placement plate 72 back into the guide plate 71 and reset the two side collars 74 to fix the position of the placement plate 72. Next, install the screen printing frame body 101 by inserting it directly between the two mounting frames 22, tightening the fixing bolts 23 to move it downwards and press it against the screen printing frame body 101, thus achieving a stable fixation. Then install the cleaning mechanism 5. During installation, align the locking blocks 511 on the two processing frames 51 with the corresponding positions on the mounting plate 50, engage them, and slide them downwards to achieve positioning and fixation of the cleaning mechanism 5. At the same time, the water inlet pipe 52 and the drain pipe 53 are connected to the water supply and drainage equipment respectively, to ensure that the cleaning fluid inside the treatment box 51 can be circulated and replaced.

[0051] After preparation, start the lifting platform 2 to lift its components, so that the screen printing frame body 101 is in contact with the circuit board body 100 below. Then, pour the required ink into the screen printing frame body 101, start one side cylinder 33 to extend its telescopic end, drive the corresponding push frame 34 and its components to rise, so that the scraper 39 mounted on it is disengaged from the screen printing frame body 101; then, start the other side cylinder 33 to retract its telescopic end, drive its push frame 34 and its components to move down, so that the scraper 39 mounted on it is tightly attached to the screen printing frame body 101.

[0052] During this process, the drive gear 36 and the driven gear 37 remain engaged, sliding synchronously but not disengaging, ensuring stable transmission. Subsequently, the electric slide rail 31 is activated, driving the slider and crossbeam 32 to move left and right, and the squeegee 39, which is in contact with the screen printing frame body 101, moves synchronously, applying pressure to the ink and spreading it evenly, so that the ink is printed through the screen printing frame body 101 onto the circuit board body 100 below.

[0053] After one printing cycle, the lifting platform 2 raises its components, separating the screen printing frame body 101 from the printed circuit board body 100. Then, the electric push rod 61 is activated, causing it to drive the connected arc plate 62 to push the ink that has exceeded the travel distance of the squeegee 39 and overflowed towards the center. Then, the reverse operation is performed: the raised squeegee 39 is lowered, while the used squeegee 39 is raised. The lowered squeegee 39 is used to push the used ink on one side, concentrating the ink for subsequent use.

[0054] When a set of squeegees 39 accumulates a lot of ink after use, the cylinders 33 on both sides can be activated while replacing the circuit board body 100. This pushes the frame 34 upwards, allowing each squeegee 39 to detach from the screen printing frame body 101. Simultaneously, the protruding end of the abutment frame 42 contacts the inclined plate 41 on the same side. Under the action of the inclined plate 41, the abutment frame 42 slides away from each other, and the elastic element 43 deforms accordingly. As the abutment frame 42 moves, it separates from the extension plate 44 until it slides to the end of the inclined plate 41. The abutment frame 42 is then pressed against the inclined plate 41, thus releasing the constraint on the squeegees 39 and the extension plate 44, facilitating subsequent replacement.

[0055] Then, the two drive motors 35 are activated, driving the drive gear 36 to rotate, further driving the agitator 38 and its old scraper 39 to rotate toward the processing frame 51. Simultaneously, the drive gear 36 meshes with the driven gear 37, causing the other agitator 38 and the new scraper 39 to rotate and fit toward the pusher 34, replacing the original scraper 39 and achieving rapid replacement. Afterward, the old scraper 39 remains above the processing frame 51, awaiting cleaning.

[0056] During the use of the new scraper 39, the old scraper 39 enters the processing frame 51 during the lifting motion and decomposes the adhering ink in the cleaning solution. As the new scraper 39 moves horizontally during use, the old scraper 39 continues to be immersed and cleaned in the processing frame 51 until it gradually rises and detaches from the processing frame 51 during the next replacement. During the rising process, the scraper 39 passes between the wiping elements 56, receiving a close and tight wiping treatment. The rotating rod 55 rotates adaptively on the support rod 54, and the elastic element 57 deforms accordingly to ensure a stable and reliable wiping effect.

[0057] The above process enables rapid replacement and automatic cleaning of the scraper 39. The entire process is seamless and efficient, significantly improving the user experience and work efficiency of the equipment.

[0058] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A screen printing device for circuit board processing, comprising: Workbench (1); The lifting platform (2) is located on the rear side of the workbench (1). The lifting platform (2) has movable ends on both sides. Movable frames (21) are provided on both sides of the movable ends. Mounting parts are provided on both sides of the movable frames (21). The mounting parts on both sides are used to place the screen printing frame body (101). The feature is that it further includes: a switching mechanism (3), the switching mechanism (3) including an electric slide rail (31) symmetrically arranged between the two movable frames (21) on both sides, a crossbeam (32) between the sliders of the two electric slide rails (31), a cylinder (33) with its telescopic end facing upward is symmetrically installed on the crossbeam (32), and a push frame (34) is also symmetrically slidably traversed on the crossbeam (32), the push frame (34) is connected to the telescopic end of the adjacent cylinder (33), a drive motor (35) is respectively installed at one end of the lower part of the push frame (34), and the two drive motors (35) on both sides are connected to the cylinder (33) with their telescopic ends facing upward. 5) The push frame (34) is arranged in a front-to-back relative distribution, and a toggle frame (38) is rotatably provided at the front and rear ends of the push frame (34). The shaft end of the toggle frame (38) located below the drive motor (35) is provided with a drive gear (36). The drive gear (36) is connected to the output end of the drive motor (35) on the same side. The shaft ends of the other two toggle frames (38) are provided with driven gears (37). The driven gears (37) mesh with the drive gears (36) on the same side. The toggle frame (38) is provided with scraper (39). The scraper (39) on both sides is used for ink return and ink scraping respectively. The cleaning mechanism (5) is symmetrically arranged between the movable frames (21) for cleaning the scraper (39); The cleaning mechanism (5) includes connectors at the front and rear ends of the movable frame (21), and a processing frame (51) is installed between two opposite connectors. A water inlet pipe (52) and a drain pipe (53) are respectively provided on both sides of the processing frame (51). A set of support rods (54) is provided on both the left and right sides inside the processing frame (51). A rotating rod (55) is rotatably mounted on each support rod (54). An elastic element (57) is provided between the rotating rod (55) and the corresponding support rod (54). A wiping element (56) is provided between two opposite rotating rods (55). The cylinders (33) on both sides are activated, and the push frame (34) rises as a whole, causing each scraper (39) to break free from the restriction of the screen printing frame body (101). Then, the drive motors (35) on both sides are activated, driving the drive gear (36) to rotate, further driving the actuating frame (38) and its old scraper (39) to rotate toward the processing frame (51). The drive gear (36) meshes with the driven gear (37), driving the other actuating frame (38) and the new scraper (39) to rotate and fit toward the push frame (34), so that it replaces the original scraper (39) in position. The old scraper (39) stays above the processing frame (51). During the use of the new scraper (39), the old scraper (39) will enter the processing frame (51) with the lifting action. The ink attached to it will be decomposed in the cleaning solution. As the new scraper (39) moves horizontally during use, the old scraper (39) will continue to be soaked and cleaned in the processing frame (51) until the next replacement. It will gradually rise and leave the processing frame (51) with the above lifting process. During the rising process, the scraper (39) passes between the wiping parts (56) and is subjected to close-fitting wiping treatment.

2. The screen printing device for circuit board processing according to claim 1, characterized in that, The mounting component includes a mounting frame (22) and a fixing bolt (23). The two sides of the movable frame (21) are provided with mounting frames (22) on opposite sides. The two sides of the mounting frames (22) are used to place the screen printing frame body (101). The mounting frames (22) are threaded with fixing bolts (23) for abutting and fixing the position of the screen printing frame body (101).

3. The screen printing device for circuit board processing according to claim 2, characterized in that, The connector includes mounting plates (50) disposed at the ends of the movable frame (21) on both sides. The processing frame (51) is symmetrically provided with locking blocks (511) adapted to the layout of the mounting plates (50). The locking blocks (511) are slidably abutted against the corresponding mounting plates (50).

4. The screen printing device for circuit board processing according to claim 3, characterized in that, It also includes a limiting member (4), which includes multiple inclined plates (41) disposed on the sliders of the electric slide rails (31) on both sides. Both ends of the push frame (34) are slidably provided with abutment frames (42). Both sides of the abutment frames (42) have protruding ends that contact and abut with the inclined plates (41) on the same side. An elastic member (43) is disposed between the abutment frame (42) and the inner wall of the corresponding push frame (34). The end of the push frame (34) is provided with an extension plate (44) that abuts with the corresponding abutment frame (42).

5. The screen printing device for circuit board processing according to claim 4, characterized in that, It also includes a concentrating mechanism (6), which includes an electric push rod (61) respectively installed on the mounting frames (22) on both sides, and an arc plate (62) for pushing ink concentration is provided on the telescopic end of the electric push rod (61).

6. The screen printing device for circuit board processing according to claim 5, characterized in that, The central mechanism (6) also includes a limiting plate (63). The arc plate (62) is slidably connected to the telescopic end of the corresponding electric push rod (61). Both ends of the arc plate (62) are hinged with limiting plates (63) that abut against the mounting frame (22) on the same side.

7. The screen printing device for circuit board processing according to claim 6, characterized in that, It also includes a positioning mechanism (7), which includes a guide plate (71) disposed on the workbench (1), a placement plate (72) slidably disposed on the guide plate (71), a right-angle plate (73) arranged circumferentially on the placement plate (72), and collars (74) slidably disposed on both sides of the guide plate (71) to abut and fit the placement plate (72).

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