Packaging box anti-counterfeiting watermark digital printing equipment

Abstract

The utility model discloses a packaging box anti-fake watermark digital printing device which comprises a rack, a printing machine is fixedly installed on the rack, an installation frame is arranged on the rack, a carbon fiber brush is installed on the installation frame in a rotating mode, a conductive sliding ring is arranged on the installation frame, and the carbon fiber brush is arranged on the conductive sliding ring. The rotor end of the conductive slip ring body is fixed to the end of a rotating shaft of the carbon fiber brush through a shrinkage fit technology, and the sub-end of the conductive slip ring body is fixedly installed on an installation frame through an insulating flange. The high-voltage output end of the electrostatic generator is connected to the stator end input contact of the conductive slip ring through the shielding cable, a high-voltage electrostatic field is generated through the electrostatic generator and conducted to the carbon fiber brush through the conductive slip ring, the surface of the carbon fiber brush is electrified, and dust, fibers and other impurities on the surface of the packaging box base material are actively adsorbed. Compared with traditional mechanical dust removal, the electrostatic adsorption has the advantage that the removal efficiency of micron-sized particles is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of packaging box printing technology, specifically to a packaging box anti-counterfeiting watermark digital printing equipment. Background Technology

[0002] Anti-counterfeiting watermarks are easily identifiable technologies embedded within paper, allowing light to pass through and creating various shadows. Watermarks can sometimes be seen when reflecting strong light or against a dark background. This phenomenon is caused by variations in paper thickness or density. There are two main methods for producing watermarked paper: roller printing and rotary screen printing. In the production of energy-saving packaging boxes, anti-counterfeiting watermark numbers are typically printed on the surface of the box.

[0003] In existing technologies, packaging box substrates generate static charges due to friction during processing and storage, which actively attract dust, fibers, and other impurities from the environment. If these impurities are not thoroughly removed before printing, they will directly lead to problems such as poor ink transfer, missing prints, ink spots, and streaks, affecting the clarity of the images and text. Furthermore, current printing equipment does not have good positioning measures for different types of packaging box substrates, which may cause deviations in printing accuracy due to positional shifts during the substrate printing process. Utility Model Content

[0004] The purpose of this invention is to provide a digital printing device for anti-counterfeiting watermarks on packaging boxes to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a digital printing equipment for anti-counterfeiting watermarks on packaging boxes, comprising a frame and a controller. A printing machine is fixedly mounted on the frame, and a mounting frame is provided on the frame. A carbon fiber brush is rotatably mounted on the mounting frame, and a conductive slip ring is provided on the mounting frame. The rotor end of the conductive slip ring body is fixed to the end of the rotating shaft of the carbon fiber brush by a heat-fitting process, and the sub-end of the conductive slip ring is fixedly mounted on the mounting frame by an insulating flange. An electrostatic generator is provided on the right side of the frame, and the high-voltage output terminal of the electrostatic generator is connected to the conductive slip ring through a shielded cable. The stator input contact and the conductive slip ring rotor output contact are connected to the carbon fiber brush. A dust suction port is fixedly installed on the mounting bracket. A mounting box is fixedly installed on the frame. The dust suction port is set in contact with the surface of the carbon fiber brush. The dust suction port is fixedly connected to the mounting box through a connecting pipe. A mounting plate is fixedly installed inside the mounting box. A negative pressure fan is installed on the mounting box. The negative pressure fan is located above the mounting plate. The connection between the dust suction port and the mounting box through the connecting pipe is located below the mounting plate. Multiple sets of equally spaced filter cartridges are fixedly installed on the mounting plate. Each filter cartridge has an air outlet.

[0006] As a further preferred embodiment of this technical solution, a cylinder is mounted on the frame, the mounting bracket is fixedly connected to the output end of the cylinder piston rod, a circulating air pump is mounted on the frame, the air outlet of the cylinder is connected to the air inlet of the circulating air pump through a purification pipeline, and the air outlet of the circulating air pump is connected to the air inlet of the cylinder through a high-pressure air pipe.

[0007] As a further preferred embodiment of this technical solution, scrapers are slidably installed on multiple sets of filter cartridges, a fixing frame is fixedly installed inside the mounting box, the scrapers are fitted to the surface of the filter cartridges, the scrapers are slidably connected to the fixing frame, a fixing rod is fixedly installed inside the fixing frame, the scrapers are slidably sleeved with the fixing rod, and a second cam is rotatably installed on the fixing frame.

[0008] As a further preferred embodiment of this technical solution, the fixed upper sleeve is fitted with two sets of symmetrically distributed second springs, the two ends of the two sets of second springs are respectively fixedly connected to the scraper and the fixed frame, and the second cam is fitted to the scraper.

[0009] As a further preferred embodiment of this technical solution, a scraper is slidably mounted on the mounting frame, the scraper is located above the dust suction port, the scraper is in contact with the surface of the carbon fiber brush, a slide rod is fixedly mounted on the mounting frame, and a first cam is rotatably mounted inside the mounting frame, the first cam being in contact with the scraper.

[0010] As a further preferred embodiment of this technical solution, the scraper is slidably sleeved with the slide rod, and two sets of symmetrically distributed first springs are sleeved on the slide rod, with the two ends of the two sets of first springs respectively fixedly connected to the scraper and the mounting bracket.

[0011] This utility model provides a digital printing device for anti-counterfeiting watermarks on packaging boxes, which has the following beneficial effects:

[0012] (1) This utility model generates a high-voltage electrostatic field through an electrostatic generator, which is conducted to the carbon fiber brush through a conductive slip ring, making the surface of the carbon fiber brush charged and actively adsorbing dust, fibers and other impurities on the surface of the packaging box substrate. Compared with traditional mechanical dust removal, electrostatic adsorption effectively improves the removal efficiency of micron-sized particles, avoiding problems such as poor ink transfer, missing printing and ink spots from the source. The dust suction port is set close to the surface of the brush, and a negative pressure airflow is formed with the negative pressure fan to collect the pollutants adsorbed by the carbon fiber brush in time, avoiding the secondary pollution of the packaging box caused by the impurities re-contacting the packaging box. The multi-layer filter cartridge filters the dust in stages to ensure a clean working environment. The cylinder drives the overall lifting of the mounting frame, and automatically adjusts the contact pressure between the brush and the substrate according to the thickness of the packaging box to ensure the consistency of dust removal for different types of substrates.

[0013] (2) This utility model uses a scraper driven by a cam to periodically scrape away the impurities accumulated on the surface of the carbon fiber brush, and forces the impurities located deep in the carbon fiber brush to fall out and be absorbed by the suction port below the scraper. This avoids some deep-seated accumulation in the carbon fiber brush, which makes it difficult to be absorbed and cleaned by negative pressure, thus affecting the subsequent good cleaning effect on the packaging box. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the mounting bracket of this utility model;

[0016] Figure 3 This is a schematic diagram showing the structural separation of the mounting bracket and the carbon fiber brush of this utility model;

[0017] Figure 4 This is a schematic diagram of the internal structure of the mounting box of this utility model;

[0018] Figure 5 This is a schematic diagram of the structure of the filter cartridge of this utility model;

[0019] Figure 6 For the present utility model Figure 5 Enlarged view of the structure at point A;

[0020] In the diagram: 1. Frame; 2. Printing press; 3. Controller; 4. Cylinder; 5. Circulating air pump; 6. Mounting bracket; 7. Carbon fiber brush; 8. Conductive slip ring; 9. Static generator; 10. Scraper; 11. Slide rod; 12. First spring; 13. First cam; 14. Dust suction port; 15. Mounting box; 16. Negative pressure fan; 17. Mounting plate; 18. Filter cartridge; 19. Air outlet; 20. Scraper; 21. Fixing bracket; 22. Fixing rod; 23. Second spring; 24. Second cam. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0022] This utility model provides a technical solution: such as Figures 1-6As shown in this embodiment, a digital printing equipment for anti-counterfeiting watermarks on packaging boxes includes a frame 1 and a controller 3. A printing machine 2 is fixedly mounted on the frame 1. A mounting frame 6 is provided on the frame 1, and a carbon fiber brush 7 is rotatably mounted on the mounting frame 6. A conductive slip ring 8 is provided on the mounting frame 6. The rotor end of the conductive slip ring 8 is fixed to the rotating shaft end of the carbon fiber brush 7 by a heat-shrinking process. The rotor end of the conductive slip ring 8 is fixedly mounted on the mounting frame 6 by an insulating flange. An electrostatic generator 9 is provided on the right side of the frame 1. The high-voltage output end of the electrostatic generator 9 is connected to the input contact of the stator end of the conductive slip ring 8 through a shielded cable. The output contact of the rotor end of the conductive slip ring 8 is connected to the carbon fiber brush 7. A dust suction port 1 is fixedly mounted on the mounting frame 6. 4. A mounting box 15 is fixedly installed on the frame 1. The suction port 14 is set against the surface of the carbon fiber brush 7 and is fixedly connected to the mounting box 15 through a connecting pipe. A mounting plate 17 is fixedly installed inside the mounting box 15. A negative pressure fan 16 is installed on the mounting box 15, and the negative pressure fan 16 is located above the mounting plate 17. The connection between the suction port 14 and the mounting box 15 through the connecting pipe is located below the mounting plate 17. Multiple sets of equally spaced filter cartridges 18 are fixedly installed on the mounting plate 17. An air outlet 19 is opened in the filter cartridge 18. A cylinder 4 is installed on the frame 1. The mounting bracket 6 is fixedly connected to the output end of the piston rod of the cylinder 4. A circulating air pump 5 is installed on the frame 1. The air outlet of the cylinder 4 is connected to the air inlet of the circulating air pump 5 through a purification pipe. The air outlet 19 is connected to the air inlet of the cylinder 4 via a high-pressure air pipe. Multiple filter cartridges 18 are slidably mounted with scrapers 20. A mounting bracket 21 is fixedly installed inside the mounting box 15. The scrapers 20 are fitted against the surface of the filter cartridges 18 and are slidably connected to the mounting bracket 21. A fixing rod 22 is fixedly installed inside the mounting bracket 21, and the scrapers 20 are slidably sleeved with the fixing rod 22. A second cam 24 is rotatably mounted on the mounting bracket 21. Two sets of symmetrically distributed second springs 23 are sleeved on the mounting bracket, with their ends fixedly connected to the scrapers 20 and the mounting bracket 21 respectively. The second cam 24 is fitted against the scrapers 20. The electrostatic generator 9 outputs 5–15kV high-voltage DC power, which is transmitted to the stator end of the conductive slip ring 8 via a shielded cable. The conductive slip ring 8 rotates... The current is conducted to the rotating shaft of the carbon fiber brush 7 by the sub-end, so that a uniform electrostatic field is formed on the surface of the carbon fiber brush 7. The high conductivity of the carbon fiber material ensures efficient charge distribution. When the charged carbon fiber brush 7 comes into contact with the surface of the packaging box substrate, the electrostatic field causes dust, fibers and other impurities to become negatively charged and are strongly adsorbed by the brush. Compared with mechanical dust removal, electrostatic adsorption is more efficient at removing small particles. The suction port 14 is arranged in close contact with the surface of the brush. The negative pressure fan 16 forms a negative pressure of ≥0.5kPa in the mounting box 15. The adsorbed impurities are sucked into the filter cartridge 18 through the connecting pipe. The air filtered and purified by the filter cartridge 18 is discharged through the air outlet 19 to avoid secondary pollution. The second cam 24 drives the scraper 20 to slide along the fixed rod 22. The scraper 20 is in close contact with the surface of the filter cartridge 18.The second spring 23 provides constant pressure to scrape dust off the surface of the filter cartridge 18, prevent filter pore blockage, and maintain the stability of the negative pressure of the system. The cylinder 4 adjusts the height of the mounting bracket 6 in real time according to the thickness of the packaging box to ensure that the carbon fiber brush 7 maintains the best contact distance with the substrate. The exhaust of the cylinder 4 enters the circulating air pump 5 through the purification pipeline, and after filtration, it is reintroduced into the air inlet of the cylinder 4 through the high-pressure air pipe to realize the recycling of compressed air and reduce the risk of external dust intrusion.

[0023] like Figure 2 and Figure 3 As shown, a scraper 10 is slidably mounted on the mounting frame 6, positioned above the suction port 14. The scraper 10 is in contact with the surface of the carbon fiber brush 7. A slide rod 11 is fixedly mounted on the mounting frame 6, and a first cam 13 is rotatably mounted inside the mounting frame 6. The first cam 13 is in contact with the scraper 10, allowing the scraper 10 to slide in a sliding connection with the slide rod 11. Two sets of symmetrically distributed first springs 12 are sleeved on the slide rod 11, with their ends fixedly connected to the scraper 10 and the mounting frame 6, respectively. The first cam 13 periodically pushes the scraper 10 to slide along the slide rod 11, and the elastic first springs 12 ensure that the scraper 10 always remains in contact with the brush surface. When the scraper 10 moves, it directly scrapes away the impurities accumulated on the brush surface, and through mechanical vibration, forces the impurities embedded deep in the brush to fall off and be simultaneously sucked away by the suction port 14 below.

[0024] This utility model provides a digital printing device for anti-counterfeiting watermarks on packaging boxes. The specific working principle is as follows: The electrostatic generator 9 outputs 5-15kV high-voltage DC power, which is transmitted to the stator end of the conductive slip ring 8 through the shielded cable. The rotor end of the conductive slip ring 8 conducts the current to the rotating shaft of the carbon fiber brush 7, so that a uniform electrostatic field is formed on the surface of the carbon fiber brush 7. The high conductivity of the carbon fiber material ensures efficient charge distribution. When the charged carbon fiber brush 7 comes into contact with the surface of the packaging box substrate, the electrostatic field causes dust, fibers and other impurities to become negatively charged and are strongly adsorbed by the brush. Compared with mechanical dust removal, electrostatic adsorption has a higher efficiency in removing small particles. The dust suction port 14 is arranged close to the surface of the brush. The negative pressure fan 16 forms a negative pressure of ≥0.5kPa in the mounting box 15. The adsorbed impurities are sucked into the filter cartridge 18 through the connecting pipe. The air filtered and purified by the filter cartridge 18 is discharged through the air outlet 19 to avoid secondary pollution. The second cam 24 drives the scraper 20 to slide along the fixed rod 22. The scraper 20 is in close contact with the surface of the filter cartridge 18. The second spring 23 provides constant pressure to scrape away dust accumulated on the surface of the filter cartridge 18, preventing filter pore blockage and maintaining the stability of the system's negative pressure. The cylinder 4 adjusts the height of the mounting bracket 6 in real time according to the thickness of the packaging box to ensure that the carbon fiber brush 7 maintains the optimal contact distance with the substrate. The exhaust from the cylinder 4 enters the circulating air pump 5 through the purification pipeline, and after filtration, it is reintroduced into the air inlet of the cylinder 4 through the high-pressure air pipe to realize the recycling of compressed air and reduce the risk of external dust intrusion. The first cam 13 periodically pushes the scraper 10 to slide along the slide bar 11, and the elastic first spring 12 ensures that the scraper 10 always keeps in contact with the brush surface. When the scraper 10 moves, it directly scrapes away the impurities accumulated on the brush surface, and the mechanical vibration forces the impurities embedded deep in the brush to fall off and be sucked away simultaneously by the suction port 14 below. The circulating air pump 5, electrostatic generator 9 and negative pressure fan 16 of this equipment support wireless control functions and realize remote interaction with the controller 3 through the integrated industrial-grade wireless communication modules installed inside them.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A digital printing equipment for anti-counterfeiting watermarks on packaging boxes, comprising a frame (1) and a controller (3), characterized in that: A printing press (2) is fixedly mounted on the frame (1). A mounting bracket (6) is provided on the frame (1). A carbon fiber brush (7) is rotatably mounted on the mounting bracket (6). A conductive slip ring (8) is provided on the mounting bracket (6). The rotor end of the conductive slip ring (8) is fixed to the end of the rotating shaft of the carbon fiber brush (7) by a heat fitting process. The rotor end of the conductive slip ring (8) is fixedly mounted on the mounting bracket (6) by an insulating flange. An electrostatic generator (9) is provided on the right side of the frame (1). The high voltage output end of the electrostatic generator (9) is connected to the stator input contact of the conductive slip ring (8) through a shielded cable. The rotor output contact of the conductive slip ring (8) is connected to the carbon fiber brush (7). The mounting bracket (6) A dust suction port (14) is fixedly installed on the frame (1), and an installation box (15) is fixedly installed on the frame (1). The dust suction port (14) is set in contact with the surface of the carbon fiber brush (7). The dust suction port (14) is fixedly connected to the installation box (15) through a connecting pipe. An installation plate (17) is fixedly installed inside the installation box (15). A negative pressure fan (16) is installed on the installation box (15). The negative pressure fan (16) is located above the installation plate (17). The connection between the dust suction port (14) and the installation box (15) through the connecting pipe is located below the installation plate (17). Multiple sets of equally spaced filter cartridges (18) are fixedly installed on the installation plate (17). An air outlet (19) is opened inside the filter cartridge (18).

2. The packaging box anti-counterfeiting watermark digital printing equipment according to claim 1, characterized in that: A cylinder (4) is mounted on the frame (1). The mounting bracket (6) is fixedly connected to the output end of the piston rod of the cylinder (4). A circulating air pump (5) is mounted on the frame (1). The air outlet of the cylinder (4) is connected to the air inlet of the circulating air pump (5) through a purification pipeline. The air outlet (19) of the circulating air pump (5) is connected to the air inlet of the cylinder (4) through a high-pressure air pipe.

3. The packaging box anti-counterfeiting watermark digital printing equipment according to claim 1, characterized in that: Each of the multiple filter cartridges (18) is slidably mounted with a scraper (20). A fixing frame (21) is fixedly mounted inside the mounting box (15). The scraper (20) is attached to the surface of the filter cartridge (18). The scraper (20) is slidably connected to the fixing frame (21). A fixing rod (22) is fixedly mounted inside the fixing frame (21). The scraper (20) is slidably sleeved with the fixing rod (22). A second cam (24) is rotatably mounted on the fixing frame (21).

4. The packaging box anti-counterfeiting watermark digital printing equipment according to claim 3, characterized in that: The fixed upper sleeve has two sets of symmetrically distributed second springs (23), the two ends of the two sets of second springs (23) are fixedly connected to the scraper (20) and the fixing frame (21) respectively, and the second cam (24) is fitted to the scraper (20).

5. The packaging box anti-counterfeiting watermark digital printing equipment according to claim 1, characterized in that: A scraper (10) is slidably mounted on the mounting bracket (6). The scraper (10) is located above the suction port (14). The scraper (10) is in contact with the surface of the carbon fiber brush (7). A slide rod (11) is fixedly mounted on the mounting bracket (6). A first cam (13) is rotatably mounted inside the mounting bracket (6). The first cam (13) is in contact with the scraper (10).

6. The packaging box anti-counterfeiting watermark digital printing equipment according to claim 5, characterized in that: The scraper (10) is slidably sleeved with the slide rod (11). Two sets of symmetrically distributed first springs (12) are sleeved on the slide rod (11). The two ends of the two sets of first springs (12) are fixedly connected to the scraper (10) and the mounting bracket (6), respectively.

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