Pre-cleaning device for large-area printing

Abstract

The invention discloses a pre-cleaning device for large-area printing, and relates to the technical field of circuit boards. The printing device comprises a printing device body, and a cleaning mechanism and a printing mechanism are arranged in the printing device body; according to the multi-stage solder paste printing device, the printing scrapers can be arranged in a multi-stage overlapping mode through the arranged printing mechanism, so that solder paste can be evenly distributed in the printing process, excessive solder paste can be distributed to the two sides, and the situation that the solder paste in other areas is too little due to the fact that the solder paste in some areas is too much is prevented; meanwhile, when an uneven or turnup area exists on the surface of the circuit board, the position of the printing scraper can be automatically adjusted according to the radian of the area, the magnetic force of the electromagnetic block is adjusted according to the vertical movement of the printing scraper, and therefore appropriate pressure is kept, and through the self-adaptive adjustment, the printing effect on the circuit board is better guaranteed. And even if the surface of the circuit board is uneven, the printing scraper can still be tightly attached to the printing silk screen.

Description

Technical Field

[0001] The invention relates to the technical field of circuit board equipment, and in particular to a pre-cleaning device for large-area printing. Background Art

[0002] The names of circuit boards include: ceramic circuit board, alumina ceramic circuit board, aluminum nitride ceramic circuit board, circuit board, PCB board, aluminum substrate, high-frequency board, thick copper board, impedance board, PCB, ultra-thin circuit board, ultra-thin circuit board, printed (copper etching technology) circuit board, etc. Circuit boards make circuits miniaturized and intuitive, and play an important role in the mass production of fixed circuits and the optimization of electrical appliance layout. Circuit boards can be called printed circuit boards or printed circuit boards. The birth and development of flexible and rigid boards - FPC and PCB have given rise to a new product, the flexible and rigid board. Therefore, the flexible and rigid board is a flexible circuit board and a rigid circuit board, which are combined together according to relevant process requirements after lamination and other processes. , forming a circuit board with the characteristics of FPC and PCB. Electronic equipment cannot do without circuit boards, from small electronic watches, calculators, and general-purpose computers to large computers, communication electronic equipment, and military weapon systems. As long as there are electronic devices such as integrated circuits, electrical interconnection between them must be used. Circuit board printing (PCB printing) usually refers to the conductive pattern of printed circuits, printed components, or a combination of the two made on insulating materials according to a predetermined design as a printed circuit, and the conductive pattern that provides electrical connection between components on the insulating substrate is called a printed circuit. In this way, the finished board of printed circuits or printed circuits is called a printed circuit board, also called a printed board or printed circuit board.

[0003] In the patent (application number: CN201911154805.0), a circuit board printing device is disclosed, which relates to the field related to circuit board printing. It aims to solve the problem in the prior art that heat escapes during the drying process and the heat is not concentrated in the printing area, resulting in a long drying time. A first drying device is installed in the middle of the rear end of the upper end surface of the workbench, and a second drying device is installed in the middle of the front end of the upper end surface of the workbench. The first drying device and the second drying device are both connected to the workbench through a sliding bar. The first drying device and the second drying device are both embedded in the interior of the workbench. The first drying device and the second drying device each include an outer frame, a placement slot, a connecting telescopic rod, a drying plate, a movable slot, a drying area, a drying device support plate and a pressure spring.

[0004] This patent and the prior art have the following technical problems in actual use: The size of the printing squeegee of the existing printing device is mostly fixed. When printing on some small or large circuit boards, the printing squeegee is very likely to cause uneven distribution of solder paste or waste of solder paste due to the fixed size. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems and provide a pre-cleaning device for large-area printing.

[0006] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: A pre-cleaning device for large-area printing comprises a printing device body, wherein a cleaning mechanism and a printing mechanism are arranged inside the printing device body; The printing mechanism includes a support frame arranged inside the printing device body, a printing rod is arranged inside the support frame, a driving groove is opened on the surface of the printing rod, and the driving groove is provided with at least six groups and is symmetrically arranged. The driving groove is provided with a certain curvature, and the curvature is set in steps. A connecting rod is slidably installed on the surface of the printing rod through the driving groove, and the length of the connecting rod is set in steps according to the curvature of the driving groove. A connecting plate is fixedly installed on one side of the connecting rod, and a pressing box is fixedly installed on the bottom of the connecting plate. An electromagnetic block is fixedly installed on the inner top of the pressing box. A mounting seat is slidably installed inside the pressing box, and a printing scraper is fixedly installed on the bottom of the mounting seat. A fixing plate is provided inside the printing device body, and two groups of the fixing plates are symmetrically provided. The fixing plates can move relatively inside the printing device body, and the printing rod can rotate inside the printing device body.

[0007] Furthermore, a driving frame is provided on one side of the printing rod, and the printing rod is rotatably connected to the inner wall of the driving frame. A connecting gear is rotatably installed on one side of the driving frame, and the shaft of the connecting gear is fixedly connected to one end of the printing rod. A driving gear is rotatably installed on one side of the driving frame, and the driving gear is meshed with the connecting gear. A driving motor is fixedly installed on one side of the driving frame, and the output end of the driving motor is fixedly connected to the driving gear.

[0008] Furthermore, a mounting frame is fixedly installed on the opposite side of the fixing plate, and a forward and reverse threaded rod is rotatably installed between the inner walls of the support frame. A connecting screw sleeve is fixedly installed inside the mounting frame, and the forward and reverse threaded rod is threadedly connected to the mounting frame through the connecting screw sleeve.

[0009] Furthermore, the cleaning mechanism includes a cleaning box fixedly mounted on the top of the support frame, a driving pump is provided inside the cleaning box, a connecting nozzle is fixedly mounted on the opposite side of the fixed plate, and a connecting pipe connected to the connecting nozzle is fixedly mounted on the opposite side of the fixed plate.

[0010] Furthermore, one side of the connecting pipe is fixedly connected to the cleaning box, a drying box is fixedly installed on the top of the support frame and on one side of the cleaning box, and one side of the connecting pipe is fixedly connected to the drying box.

[0011] Furthermore, an electric heating plate is fixedly installed inside the drying box, a rotating blade is rotatably installed on the inner top of the drying box, a drying motor is fixedly installed on the top of the drying box, and the output end of the drying motor is fixedly connected to the rotating blade.

[0012] Furthermore, a plurality of through slots are provided on the inner top of the printing device body, and a collection box is fixedly installed inside the printing device body and below the through slots.

[0013] Furthermore, a collecting port is provided on the surface of the fixing plate, a locking groove is provided on the opposite side of the fixing plate, an adjusting motor is fixedly installed on one side of the support frame, and the output end of the adjusting motor is fixedly connected to the forward and reverse threaded rods.

[0014] Furthermore, a magnet is fixedly mounted on the top of the mounting seat, and the electromagnetic block cooperates with the magnet.

[0015] Furthermore, an adjustment plate is fixedly installed between the inner walls of the printing device body, a first electric telescopic rod is fixedly installed between the adjustment plate and the support frame, a second electric telescopic rod is fixedly installed on one side of the support frame, and the output end of the second electric telescopic rod is fixedly connected to one side of the drive frame. A control center is provided on the surface of the printing device body, and the control center is electrically connected to the drive motor, the adjustment motor, the drive pump, the drying motor and the electromagnetic block.

[0016] The beneficial effects of the present invention are as follows: 1. The present invention can set the printing scraper in multiple overlapping levels through the printing mechanism. During the printing process, the solder paste can be evenly distributed. Excess solder paste will be distributed to both sides, preventing the situation where there is too much solder paste in some areas and too little solder paste in other areas, which helps to ensure a more accurate printing effect on the circuit board. At the same time, when there are uneven or raised areas on the surface of the circuit board, the printing scraper will automatically adjust its position according to the curvature of the area, and the electromagnetic block adjusts the magnetic force according to the up and down movement of the printing scraper to maintain appropriate pressure. Through this adaptive adjustment, it can be ensured that even if the surface of the circuit board is uneven, the printing scraper can still fit closely to the printing screen, thereby ensuring uniform printing of the solder paste, avoiding printing problems caused by unevenness, and reducing the defect rate. At the same time, by controlling the relative movement of the fixed plate, the printing scraper can expand toward the middle or outward during the printing process to adapt to circuit boards of different sizes. During printing, the printing scraper can be more adaptable to the circuit board of the size, preventing the printing scraper from being too large or too small, resulting in waste of solder paste and uneven printing.

[0017] 2. The cleaning mechanism provided in the present invention can deliver the cleaning liquid to the connecting nozzle for spraying, which can efficiently clean the residual solder paste and impurities on the surface of the screen after printing. At the same time, after the solder paste is flushed down, it flows into the collection box through the through groove, ensuring the smoothness and cleanliness of the entire cleaning process, and avoiding the residue from affecting the next printing. At the same time, through the cooperation of the drying motor and the electric heating plate, the screen and the inner surface of the printing device body can be quickly dried after cleaning, and the cleaned part can be quickly dried to avoid moisture interfering with the next printing. At the same time, the dried screen can preheat the solder paste, thereby reducing the occurrence of poor printing effects due to uneven or excessively viscous solder paste. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of the present invention; Figure 2 It is a schematic diagram of the overall main view of the present invention; Figure 3 It is a schematic diagram of the cleaning mechanism of the present invention; Figure 4 It is a schematic diagram of the support frame of the present invention; Figure 5 It is a schematic diagram of the interior of the support frame of the present invention; Figure 6 It is a schematic diagram of the printing mechanism of the present invention; Figure 7 It is a schematic diagram of a printing scraper of the present invention; Figure 8 It is a bottom view schematic diagram of the printing mechanism of the present invention; Figure 9 This invention Figure 4 Schematic diagram at point A in the middle; Figure 10 This is a schematic diagram of the interior of the pressing box of the present invention; Figure 11 It is a schematic diagram of the interior of the drying box of the present invention.

[0019] Figure numerals: 1. Printing device body; 2. Cleaning mechanism; 201. Cleaning box; 202. Connecting nozzle; 203. Connecting pipe; 204. Drying box; 205. Electric heating plate; 206. Rotating blade; 207. Drying motor; 3. Printing mechanism; 301. Support frame; 302. Printing rod; 303. Driving groove; 304. Connecting rod; 305. Connecting plate; 306. Pressing box; 307. Electromagnetic block; 308. Mounting seat; 309. Printing scraper; 4. Driving frame; 5. Connecting gear; 6. Driving gear; 7. Driving motor; 8. Fixing plate; 9. Mounting frame; 10. Positive and negative threaded rod; 11. Collecting port; 12. Engaging groove; 13. Adjusting motor; 14. Magnet; 15. Adjusting plate; 16. Control center; 17. Second electric telescopic rod; 18. Through groove. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0021] A pre-cleaning device for large-area printing according to a preferred embodiment of the present invention will be described in detail below.

[0022] Example 1, as Figures 1-11 As shown, it includes a printing device body 1, and a cleaning mechanism 2 and a printing mechanism 3 are provided inside the printing device body 1; The printing mechanism 3 includes a support frame 301 disposed within the printing device body 1. A printing rod 302 is disposed within the support frame 301. Drive slots 303 are formed on the surface of the printing rod 302. There are at least six sets of drive slots 303, which are symmetrically arranged. The drive slots 303 have a certain curvature, and the curvature is set in steps. A connecting rod 304 is slidably mounted on the surface of the printing rod 302 through the drive slots 303. The length of the connecting rod 304 is set in steps according to the curvature of the drive slots 303. A connecting plate 305 is fixedly mounted on one side of the connecting rod 304. A pressing box 306 is fixedly mounted on the bottom of the connecting plate 305. An electromagnetic block 307 is fixedly mounted on the inner top of the pressing box 306. A mounting seat 308 is slidably mounted on the interior of the pressing box 306. A printing scraper 309 is fixedly mounted on the bottom of the mounting seat 308. The printing device body 1 is provided with fixed plates 8, and two sets of fixed plates 8 are symmetrically provided. The fixed plates 8 can move relatively inside the printing device body 1, and the printing rod 302 can rotate inside the printing device body 1; First, the staff places the circuit board to be printed on the surface of the printing device body 1, and then places the printing screen between the fixed plates 8, controls the relative movement of the fixed plates 8, thereby fixing the two sides of the printing screen and clamping it. During the relative movement of the fixed plates 8, the printing rod 302 can rotate at the same time. In this process, since the surface of the printing rod 302 is provided with a driving groove 303 with a step-by-step arc, when the printing rod 302 rotates, the connecting rod 304 will rotate on the surface of the driving groove 303 under the rotation of the printing rod 302. When the fixed plates 8 move relatively, the printing rod 302 can rotate at the same time. 302 rotates clockwise, and the connecting rods 304 move relative to each other through the driving slot 303. Since the length of the connecting rod 304 is set according to the driving slot 303, when the printing rod 302 rotates clockwise, the printing scrapers 309 on both sides can move toward the middle under the movement of the connecting rod 304, so that they overlap and reduce the printing width of the printing scraper 309. Then the staff controls the support frame 301 to move downward. During the downward movement of the support frame 301, the printing rod 302 is driven to move downward through the connecting rod 304 and the pressing box 306, and the printing scraper 309 is moved downward and overlaps with the printing silk screen. The screen contacts and fits, and then the staff injects the printing solder paste into the surface of the printing screen through an external mechanism, and then controls the electromagnetic block 307 to start. Due to its own magnetism, the electromagnetic block 307 pushes the mounting seat 308 to slide to the bottom inside the pressing box 306 due to the repulsion of like charges, so that the bottom of the printing scraper 309 is tightly fitted to the surface of the printing screen. Then the printing rod 302 is controlled to move, so that the solder paste passes through the printing screen and prints on the surface of the circuit board. If there are uneven and warped areas on the surface of the circuit board, since the printing scraper 309 is provided with at least six groups, the printing in that area will be When the brush scraper 309 passes through this place, it will lift the printing scraper 309 due to the arc of the warp, and the printing scraper 309 will push the mounting seat 308 to move upward inside the pressing box 306. At this time, the electromagnetic block 307 will adjust its own magnetic force according to the distance the printing scraper 309 moves upward, thereby preventing the printing pressure of the printing scraper 309 from being too high, resulting in uneven distribution of solder paste. At the same time, since the printing scraper 309 is set to multi-level overlap, during the printing movement process, excessive solder paste will be divided to both sides, so that some areas with excessive solder paste are divided to some areas with insufficient solder paste. At the same time, when printing some larger-sized circuit boards, the staff can control the fixed plate 8 to move back to back. During the movement, the printing rod 302 rotates counterclockwise, which means that the connecting rod 304 moves outward inside the driving groove 303, thereby driving the printing scraper 309 to gradually move outward and expand, so that circuit boards of different sizes can be printed. The cleaning mechanism 2 can clean the screen before and after printing. The printing mechanism 3 can be used to set the printing scraper 309 in multiple overlapping levels. During the printing process, the solder paste can be evenly distributed. Excess solder paste will be distributed to both sides, preventing the situation where there is too much solder paste in some areas and too little solder paste in other areas. This helps to ensure a more accurate printing effect on the circuit board. At the same time, when there are uneven or warped areas on the surface of the circuit board, the printing scraper 309 will automatically adjust its position according to the curvature of the area. The electromagnetic block 307 adjusts the magnetic force according to the up and down movement of the printing scraper 309, thereby maintaining appropriate pressure. Through this adaptive adjustment, it can be ensured that even if the surface of the circuit board is uneven, the printing scraper 309 can still fit tightly to the printing screen, thereby ensuring uniform printing of the solder paste, avoiding printing problems caused by unevenness, and reducing the defect rate. At the same time, by controlling the relative movement of the fixed plate 8, the printing scraper 309 can expand toward the middle or outward during the printing process to adapt to circuit boards of different sizes. During printing, the printing scraper 309 can be more adaptable to the size of the circuit board, preventing the printing scraper 309 from being too large or too small, resulting in waste of solder paste and uneven printing.

[0023] Example 2, as Figures 1-8 As shown, a drive frame 4 is provided on one side of the print rod 302. The print rod 302 is rotatably connected to the inner wall of the drive frame 4. A connecting gear 5 is rotatably mounted on one side of the drive frame 4. The shaft of the connecting gear 5 is fixedly connected to one end of the print rod 302. A driving gear 6 is rotatably mounted on one side of the drive frame 4. The driving gear 6 is meshed with the connecting gear 5. A driving motor 7 is fixedly mounted on one side of the drive frame 4. The output end of the driving motor 7 is fixedly connected to the driving gear 6. When the drive motor 7 is started, the output end of the drive motor 7 drives the drive gear 6 to rotate. When the drive gear 6 rotates, it engages with the connecting gear 5 and drives the connecting gear 5 to rotate synchronously. When the connecting gear 5 rotates, it drives the print rod 302 to rotate, thereby rotating clockwise or counterclockwise.

[0024] Example 3, as Figure 1-Figure 5 As shown, a mounting frame 9 is fixedly installed on the opposite side of the fixing plate 8, and a positive and negative threaded rod 10 is rotatably installed between the inner walls of the support frame 301. A connecting screw sleeve is fixedly installed inside the mounting frame 9, and the positive and negative threaded rod 10 is threadedly connected to the mounting frame 9 through the connecting screw sleeve; When the forward and reverse threaded rod 10 rotates, since the interior of the mounting frame 9 is provided with a connecting screw sleeve threadedly connected to it, the mounting frame 9 moves threadedly on the surface of the forward and reverse threaded rod 10 through the connecting screw sleeve. At the same time, since there are two groups of mounting frames 9, the two groups of mounting frames 9 move relative to or away from each other, thereby realizing the clamping operation of the wire mesh through the fixing plate 8.

[0025] Example 4, as Figures 1-11As shown, the cleaning mechanism 2 includes a cleaning box 201 fixedly mounted on the top of the support frame 301, a driving pump is provided inside the cleaning box 201, a connecting nozzle 202 is fixedly mounted on the side opposite to the fixed plate 8, a connecting pipe 203 communicating with the connecting nozzle 202 is fixedly mounted on the side opposite to the fixed plate 8, one side of the connecting pipe 203 is fixedly connected to the cleaning box 201, a drying box 204 is fixedly mounted on the top of the support frame 301 and located on one side of the cleaning box 201, one side of the connecting pipe 203 is fixedly connected to the drying box 204, an electric heating plate 205 is fixedly mounted inside the drying box 204, a rotating blade 206 is rotatably mounted on the inner top of the drying box 204, a drying motor 207 is fixedly mounted on the top of the drying box 204, and the output end of the drying motor 207 is fixedly connected to the rotating blade 206, a plurality of through slots 18 are opened on the inner top of the printing device body 1, and a collecting box is fixedly mounted inside the printing device body 1 and below the through slots 18; When printing is completed, the staff can remove the printed circuit board, and then control the driving pump to transport the cleaning liquid inside the cleaning box 201 through the connecting pipe 203 connected thereto to the connecting nozzle 202 connected thereto for spraying, thereby cleaning the printed screen. Since the surface of the printing device body 1 is provided with a through groove 18, the solder paste washed off will flow into the interior of the collection box below it through the through groove 18. Then the staff can control the drying motor 207 and the electric heating plate 205 to start, and the drying motor 207 drives the rotating blade 206 to rotate. , and at the same time, the air is transported to the connecting pipe 203 connected thereto. In this process, the air is heated by the electric heating plate 205 after passing therethrough, and then ejected from the connecting nozzle 202 on the other side, thereby drying the screen and the inner surface of the printing device body 1, so as not to affect the next printing work. At the same time, during printing, the screen can also be preheated, so as to prevent the solder paste from being too viscous when it is transported to its surface, resulting in poor printing effect. At the same time, the screen can also be pre-cleaned by the cleaning box 201 provided to prevent dust and other impurities from adhering to the screen surface. The cleaning mechanism 2 is provided to deliver the cleaning liquid to the connecting nozzle 202 for spraying, which can effectively clean the residual solder paste and impurities on the surface of the screen after printing. At the same time, after the solder paste is flushed down, it flows into the collection box through the through groove 18, ensuring the smoothness and cleanliness of the entire cleaning process, and avoiding the residue from affecting the next printing. At the same time, through the cooperation of the drying motor 207 and the electric heating plate 205, the screen and the inner surface of the printing device body 1 can be quickly dried after cleaning, and the cleaned part can be quickly dried to avoid moisture interfering with the next printing. At the same time, the dried screen can preheat the solder paste, thereby reducing the occurrence of poor printing effects due to uneven or excessively viscous solder paste.

[0026] Example 5, as Figures 1-11As shown, a collecting port 11 is provided on the surface of the fixing plate 8, a locking groove 12 is provided on the opposite side of the fixing plate 8, an adjusting motor 13 is fixedly mounted on one side of the support frame 301, the output end of the adjusting motor 13 is fixedly connected to the positive and negative threaded rods 10, a magnet 14 is fixedly mounted on the top of the mounting base 308, and the electromagnetic block 307 cooperates with the magnet 14; The regulating motor 13 can drive the forward and reverse threaded rods 10 to rotate, so that the fixing plate 8 can fix and clamp the wire mesh.

[0027] Example 6: Figures 1-11 As shown, an adjustment plate 15 is fixedly mounted between the inner walls of the printing device body 1, a first electric telescopic rod is fixedly mounted between the adjustment plate 15 and the support frame 301, a second electric telescopic rod 17 is fixedly mounted on one side of the support frame 301, an output end of the second electric telescopic rod 17 is fixedly connected to one side of the drive frame 4, and a control center 16 is provided on the surface of the printing device body 1. The control center 16 is electrically connected to the drive motor 7, the adjustment motor 13, the drive pump, the drying motor 207, and the electromagnetic block 307; By setting up the control center 16, the driving components inside the device can be controlled to respond accurately during printing.

[0028] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pre-cleaning device for large-area printing, comprising a printing device body (1), characterized in that: A cleaning mechanism (2) and a printing mechanism (3) are provided inside the printing device body (1); The printing mechanism (3) comprises a support frame (301) arranged inside the printing device body (1), a printing rod (302) is arranged inside the support frame (301), a driving groove (303) is provided on the surface of the printing rod (302), at least six groups of driving grooves (303) are provided and are symmetrically arranged, the driving grooves (303) are provided with a certain curvature, and the curvature is arranged in steps, and a connecting rod ( 304), the length of the connecting rod (304) is set step by step according to the curvature of the driving groove (303), a connecting plate (305) is fixedly installed on one side of the connecting rod (304), a pressing box (306) is fixedly installed on the bottom of the connecting plate (305), an electromagnetic block (307) is fixedly installed on the inner top of the pressing box (306), a mounting seat (308) is slidably installed inside the pressing box (306), and a printing scraper (309) is fixedly installed on the bottom of the mounting seat (308); A fixing plate (8) is provided inside the printing device body (1), and two groups of the fixing plates (8) are symmetrically provided. The fixing plates (8) can move relatively inside the printing device body (1), and the printing rod (302) can rotate inside the printing device body (1).

2. A pre-cleaning device for large-area printing according to claim 1, characterized in that: A driving frame (4) is provided on one side of the printing rod (302), the printing rod (302) is rotatably connected to the inner wall of the driving frame (4), a connecting gear (5) is rotatably mounted on one side of the driving frame (4), the shaft of the connecting gear (5) is fixedly connected to one end of the printing rod (302), a driving gear (6) is rotatably mounted on one side of the driving frame (4), the driving gear (6) is meshedly connected to the connecting gear (5), a driving motor (7) is fixedly mounted on one side of the driving frame (4), and an output end of the driving motor (7) is fixedly connected to the driving gear (6).

3. A pre-cleaning device for large-area printing according to claim 1, characterized in that: A mounting frame (9) is fixedly mounted on the opposite side of the fixing plate (8), a forward and reverse threaded rod (10) is rotatably mounted between the inner walls of the support frame (301), a connecting screw sleeve is fixedly mounted inside the mounting frame (9), and the forward and reverse threaded rod (10) is threadedly connected to the mounting frame (9) via the connecting screw sleeve.

4. A pre-cleaning device for large-area printing according to claim 1, characterized in that: The cleaning mechanism (2) comprises a cleaning box (201) fixedly mounted on the top of the support frame (301), a driving pump being provided inside the cleaning box (201), a connecting nozzle (202) being fixedly mounted on the side opposite to the fixing plate (8), and a connecting pipe (203) communicating with the connecting nozzle (202) being fixedly mounted on the side opposite to the fixing plate (8).

5. A pre-cleaning device for large-area printing according to claim 4, characterized in that: The connecting pipe (203) on one side is fixedly connected to the cleaning box (201), and a drying box (204) is fixedly installed on the top of the support frame (301) and located on one side of the cleaning box (201), and the connecting pipe (203) on one side is fixedly connected to the drying box (204).

6. A pre-cleaning device for large-area printing according to claim 5, characterized in that: An electric heating plate (205) is fixedly installed inside the drying box (204), a rotating blade (206) is rotatably installed on the top of the drying box (204), a drying motor (207) is fixedly installed on the top of the drying box (204), and an output end of the drying motor (207) is fixedly connected to the rotating blade (206).

7. The pre-cleaning device for large-area printing according to claim 1, characterized in that: A plurality of through slots (18) are provided on the inner top of the printing device body (1), and a collection box is fixedly installed inside the printing device body (1) and below the through slots (18).

8. The pre-cleaning device for large-area printing according to claim 1, characterized in that: A collecting port (11) is provided on the surface of the fixing plate (8), and a locking groove (12) is provided on the opposite side of the fixing plate (8). An adjusting motor (13) is fixedly mounted on one side of the support frame (301), and an output end of the adjusting motor (13) is fixedly connected to the forward and reverse threaded rods (10).

9. The pre-cleaning device for large-area printing according to claim 1, characterized in that: A magnet (14) is fixedly mounted on the top of the mounting seat (308), and the electromagnetic block (307) cooperates with the magnet (14).

10. The pre-cleaning device for large-area printing according to claim 1, characterized in that: An adjustment plate (15) is fixedly installed between the inner walls of the printing device body (1), a first electric telescopic rod is fixedly installed between the adjustment plate (15) and the support frame (301), a second electric telescopic rod (17) is fixedly installed on one side of the support frame (301), an output end of the second electric telescopic rod (17) is fixedly connected to one side of the drive frame (4), a control center (16) is provided on the surface of the printing device body (1), and the control center (16) is electrically connected to the drive motor (7), the adjustment motor (13), the drive pump, the drying motor (207) and the electromagnetic block (307).

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