Automatic ink supply device for high-speed printing machine

Abstract

The application relates to the technical field of printing equipment, in particular to a high-speed printing machine automatic ink supply device which comprises a top plate, a pump ink assembly is arranged at the top of the top plate, and an ink feeding assembly is arranged at the bottom of the top plate. The device can be used for forming a uniform ink film layer on the surface of a brushing roller through the cooperation of a scraper and the brushing roller, the uniform distribution of the ink is further enhanced through the spiral flow guide groove on the surface of the brushing roller, the ink is axially conveyed along the roller body through the spiral flow guide structure, the local ink accumulation or dryness is effectively avoided, and the device can realize the effect of efficiently and uniformly coating the screened printing substrate through the double action of mechanical scraping and spiral flow guiding.

Description

Technical Field

[0001] This application relates to the field of printing equipment technology, and in particular to an automatic ink supply device for a high-speed printing press. Background Technology

[0002] Early printing presses relied heavily on manual ink supply. Manually adding ink was not only inefficient but also made it difficult to guarantee a continuous and stable ink supply. During high-speed printing, even slight negligence could lead to insufficient ink supply, resulting in uneven ink coverage, blank streaks, and other defects on the printed materials, severely impacting print quality. Furthermore, frequent manual ink supply operations increased ink waste and the cost of cleaning and maintaining the equipment.

[0003] A search revealed Chinese Patent Publication No. CN214188930U, which discloses an automatic ink supply device for printing equipment. This device includes an ink tank, an ink diaphragm pump, and an ink distribution chamber. This application addresses the ink supply needs of existing screen printing equipment, replacing the traditional manual method of adding ink from containers. The automatic ink supply device described in this application solves the problems of long ink-adding times and waste of ink and auxiliary materials in current ink-adding processes. Furthermore, this automatic ink supply reduces labor costs and minimizes safety hazards during operation.

[0004] Regarding the aforementioned technologies, the inventors have discovered the following drawbacks: The simple branch-cavity structure of the aforementioned devices makes it difficult to meet the dynamic ink volume adjustment requirements of high-speed printing, easily leading to uneven ink layer thickness or printhead clogging. Traditional ink supply systems often supply ink via a single printhead or gravity flow, which can easily cause ink droplet splatter or discontinuous coating during high-speed printing, affecting print quality. Open-type ink supply structures are prone to ink contamination, and the ink path system is complex to clean, resulting in long downtime maintenance times and reduced production efficiency. Utility Model Content

[0005] To address the problems mentioned in the background art, this application provides an automatic ink supply device for a high-speed printing press.

[0006] This application provides an automatic ink supply device for a high-speed printing press, which adopts the following technical solution: an automatic ink supply device for a high-speed printing press includes a top plate, an ink pump assembly is provided at the top of the top plate, and an ink delivery assembly is provided at the bottom of the top plate.

[0007] The ink feeding assembly includes a scraper, a bearing side plate, a coating roller, a first ink outlet chamber housing, a first nozzle, a second ink outlet chamber housing, and a second nozzle. The scraper is fixedly connected to the left and right sides of the bottom of the top plate, and the bearing side plate is fixedly connected between the scrapers. The coating roller is movably installed on one side of the bearing side plate. The first ink outlet chamber housing is fixedly installed at the bottom of the top plate, and the bottom of the first ink outlet chamber housing is connected to the first nozzle. The second ink outlet chamber housing is fixedly installed on the other side of the bottom of the top plate, and the bottom of the second ink outlet chamber housing is connected to the second nozzle. The first nozzle and the second nozzle are arranged alternately.

[0008] The above solution, employing a bidirectional staggered inkjet structure and combined with scraper gap control technology, effectively reduces ink splashing and improves coating uniformity, making it particularly suitable for high-speed printing conditions of 800-1200r / min.

[0009] Optionally, the ink pump assembly includes a main ink cartridge, an ink pump, a secondary ink cartridge, and a negative pressure pump. The main ink cartridge is connected to the ink inlet hose, the ink outlet of the main ink cartridge is connected to the ink pump via a hose, the ink pump is connected to the secondary ink cartridge via a hose, the secondary ink cartridge supplies ink to the first ink outlet chamber housing and the second ink outlet chamber housing via a hose, and the negative pressure pump is connected to the first ink outlet chamber housing and the second ink outlet chamber housing via a pipe, and regulates the air pressure inside the first ink outlet chamber housing and the second ink outlet chamber housing via an air pipe.

[0010] The above scheme constructs a two-stage buffer ink supply system, which, combined with negative pressure dynamic adjustment technology, ensures that the ink supply pressure is stable within the range of 0.2-0.5MPa, achieving a flow control accuracy of ±2%.

[0011] Optionally, the coating roller is disposed between the scrapers, and the distance between the coating roller and the scrapers is 1-2 mm.

[0012] The above method forms a precise ink shear layer, which can control the ink viscosity within the range of 12-18 Pa·s, significantly reducing atomization during high-speed rotation.

[0013] Optionally, the first nozzle and the second nozzle are respectively disposed on the left and right sides of the coating roller, and the ink droplets discharged from the first nozzle and the second nozzle fall into the gap between the scraper and the coating roller.

[0014] The above scheme forms a symmetrical supply mode, which increases the ink coverage to over 98% through a 45° staggered spray angle, while reducing ink loss by 30%.

[0015] Optionally, the negative pressure pump is connected to the outer shell of the first ink outlet chamber and the outer shell of the second ink outlet chamber respectively through independent air pressure sensors, and dynamically adjusts the ink flow rate of the first printhead and the second printhead according to the real-time air pressure value.

[0016] The above scheme achieves independent closed-loop control of the dual-chamber pressure, which can control the pressure fluctuation within a certain range.

[0017] Within ±50Pa, ensure inkjet linearity error <1.5%.

[0018] Optionally, the surface of the coating roller is provided with a spiral guide groove, the depth of which is 0.5-1mm and the spiral angle of which is 15°-30°.

[0019] The above scheme, using a 25° helix angle and a 0.8mm groove depth, improves the uniformity of ink axial distribution by 40%, making it particularly suitable for wide-format printing with a width of 1200mm or more.

[0020] Optionally, the axial direction of the first and second nozzles forms an angle of 45°-60° with the rotation direction of the coating roller, and the orifice diameter of the first and second nozzles is 0.3-0.5mm.

[0021] By optimizing the jet dynamics parameters using the above method, the atomized particle size of the 0.4mm orifice nozzle can reach 20-30μm, significantly improving the clarity of the pattern edges.

[0022] In summary, this application includes the following beneficial technical effects:

[0023] 1. This utility model, by setting up components such as a scraper, a coating roller, a first nozzle, and a second nozzle, and through the precise 1-2mm gap between the scraper and the coating roller, allows the ink droplets sprayed alternately from the first and second nozzles to form a uniform ink film layer on the surface of the coating roller through the scraping action of the scraper. The spiral guide grooves on the surface of the coating roller (depth 0.5-1mm, spiral angle 15°-30°) further enhance the uniform distribution of ink. The spiral guide structure transports the ink along the axial direction of the roller body, effectively avoiding local ink accumulation or drying. Thus, this device achieves the effect of efficient and uniform coating of selected printing substrates through the dual action of mechanical scraping and spiral guide.

[0024] 2. This utility model, by incorporating components such as a negative pressure pump, an air pressure sensor, and a dual-path printhead system, achieves precise ink flow rate control for 0.3-0.5mm orifice printheads through dynamic air pressure adjustment via the linkage control of the negative pressure pump with the air pressure of the first / second ink outlet chamber housings. Combined with the 45°-60° angle design between the printhead axis and the rotation direction of the coating roller, ink droplets are sprayed into the coating gap at the optimal angle, ensuring ink penetration while preventing splashing. This achieves the effect of precise ink supply for selected high-speed printing conditions through closed-loop air pressure control and printhead angle optimization, effectively improving printing quality and production efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application;

[0026] Figure 2 This is a partial structural diagram of an embodiment of this application;

[0027] Figure 3 This is a partial structural diagram of the ink delivery component in an embodiment of this application;

[0028] Figure 4 This is a partial structural installation diagram of the ink delivery component in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the internal structure of the ink delivery component in an embodiment of this application.

[0030] Reference numerals: 1. Top plate; 2. Ink pump assembly; 201. Main ink cartridge; 202. Ink pump; 203. Secondary ink cartridge; 204. Negative pressure pump; 3. Ink delivery assembly; 301. Squeegee; 302. Bearing side plate; 303. Coating roller; 304. First ink outlet chamber housing; 305. First printhead; 306. Second ink outlet chamber housing; 307. Second printhead. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0032] This application discloses an automatic ink supply device for a high-speed printing press.

[0033] Please see Figure 1 An automatic ink supply device for a high-speed printing press includes a top plate 1, an ink pump assembly 2 is provided on the top of the top plate 1, and an ink delivery assembly 3 is provided on the bottom of the top plate 1.

[0034] Please see Figures 2 to 5 The ink feeding assembly 3 includes a scraper 301, a bearing side plate 302, a coating roller 303, a first ink outlet chamber housing 304, a first nozzle 305, a second ink outlet chamber housing 306, and a second nozzle 307. The scraper 301 is fixedly connected to the left and right sides of the bottom of the top plate 1. The bearing side plate 302 is fixedly connected between the scrapers 301. The coating roller 303 is movably installed on one side of the bearing side plate 302. The first ink outlet chamber housing 304 is fixedly installed at the bottom of the top plate 1. The bottom of the first ink outlet chamber housing 304 is connected to the first nozzle 305. The second ink outlet chamber housing 306 is fixedly installed on the other side of the bottom of the top plate 1. The bottom of the second ink outlet chamber housing 306 is connected to the second nozzle 307. The first nozzle 305 and the second nozzle 307 are staggered.

[0035] The coating roller 303 is disposed between the scrapers 301, and the distance between the coating roller 303 and the scrapers 301 is 1-2 mm.

[0036] The first nozzle 305 and the second nozzle 307 are respectively disposed on the left and right sides of the coating roller 303. The ink droplets discharged from the first nozzle 305 and the second nozzle 307 fall into the gap between the scraper 301 and the coating roller 303.

[0037] The surface of the coating roller 303 is provided with a spiral guide groove, the depth of which is 0.5-1mm and the spiral angle of which is 15°-30°.

[0038] The axial direction of the first nozzle 305 and the second nozzle 307 forms an angle of 45°-60° with the rotation direction of the coating roller 303, and the aperture of the first nozzle 305 and the second nozzle 307 is 0.3-0.5mm.

[0039] The ink pump assembly 2 includes a main ink cartridge 201, an ink pump 202, a secondary ink cartridge 203, and a negative pressure pump 204. The main ink cartridge 201 is connected to the ink inlet hose, and the ink outlet of the main ink cartridge 201 is connected to the ink pump 202 through a hose. The ink pump 202 is connected to the secondary ink cartridge 203 through a hose. The secondary ink cartridge 203 supplies ink to the first ink outlet chamber housing 304 and the second ink outlet chamber housing 306 through a hose. The negative pressure pump 204 is connected to the first ink outlet chamber housing 304 and the second ink outlet chamber housing 306 through a pipe, and regulates the air pressure inside the first ink outlet chamber housing 304 and the second ink outlet chamber housing 306 through an air pipe.

[0040] The negative pressure pump 204 is connected to the first ink outlet chamber housing 304 and the second ink outlet chamber housing 306 respectively through independent air pressure sensors, and dynamically adjusts the ink flow rate of the first printhead 305 and the second printhead 307 according to the real-time air pressure value.

[0041] Further explanation is needed: the ink delivery assembly 3 plays a crucial role in the automatic ink supply system of the high-speed printing press. The scraper 301 is fixed to both sides of the bottom of the top plate 1 and connected to the bearing side plate 302, providing structural support for the entire ink delivery assembly. The coating roller 303, which is movably installed on one side of the bearing side plate 302, plays an important coating function during the ink delivery process. The first ink outlet chamber housing 304 and the second ink outlet chamber housing 306 are fixed at different positions on the bottom of the top plate 1. The first nozzle 305 and the second nozzle 307, which are connected at their bottoms, are staggered and located on the left and right sides of the coating roller 303. The ink they discharge drips into the gap between the scraper 301 and the coating roller 303. The spiral guide grooves on the surface of the coating roller 303 can guide the ink to be evenly distributed, thereby evenly coating the ink on the printing material, ensuring the uniformity and quality of printing. The entire ink delivery assembly 3 works in concert to achieve precise and efficient delivery of ink from the nozzle to the printing material.

[0042] The implementation principle of the automatic ink supply device for a high-speed printing press according to an embodiment of this application is as follows:

[0043] First, the ink pump assembly 2 starts the ink supply process. The main ink cartridge 201 delivers ink to the secondary ink cartridge 203 through the ink pump 202. After buffering and stabilizing, ink is supplied to the first ink outlet chamber housing 304 and the second ink outlet chamber housing 306 respectively. At the same time, the negative pressure pump 204 monitors and dynamically adjusts the air pressure of the two ink outlet chambers in real time through an independent air pressure sensor to ensure stable ink flow rate.

[0044] Secondly, the dual nozzles supply ink in an alternating manner. The first nozzle 305 and the second nozzle 307 are located on the left and right sides of the coating roller 303, respectively. They spray ink droplets into the 1-2mm gap between the scraper 301 and the coating roller 303 at an angle of 45°-60°. The staggered 0.3-0.5mm aperture nozzles form a cross ink mist that covers the entire coating area.

[0045] Next, the coating roller 303 dynamically distributes ink. The spiral guide grooves on the surface of the coating roller 303 have a depth of 0.5-1mm and a spiral angle of 15°-30°. During rotation, the dripping ink is evenly guided along the grooves to the roller surface to form an ink film of uniform thickness. At the same time, the scraper 301 maintains micro-contact with the roller surface to scrape off excess ink and control the ink layer thickness.

[0046] Next, ink film transfer printing is performed. As the printing material moves, the rotating coating roller 303 evenly coats the ink film onto the substrate surface, achieving high-speed printing. The spiral structure of the guide groove works in conjunction with the rotation direction of the roller to ensure stable transfer of the ink film under the balance of centrifugal force and surface tension.

[0047] Finally, closed-loop air pressure control is implemented. The negative pressure pump 204 continuously monitors the air pressure in the ink chamber and fine-tunes the airflow based on real-time feedback data to compensate for pressure changes caused by printhead blockage or ink volume fluctuations, ensuring ink supply accuracy throughout the entire process and avoiding ink leakage or ink interruption.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic ink supply device for a high-speed printing press, comprising a top plate (1), characterized in that: The top of the top plate (1) is provided with an ink pump assembly (2), and the bottom of the top plate (1) is provided with an ink delivery assembly (3). The ink feeding assembly (3) includes a scraper (301), a bearing side plate (302), a coating roller (303), a first ink outlet chamber housing (304), a first nozzle (305), a second ink outlet chamber housing (306), and a second nozzle (307). The scraper (301) is fixedly connected to the left and right sides of the bottom of the top plate (1), and the bearing side plate (302) is fixedly connected between the scrapers (301). One side of the bearing side plate (302) is movable. A coating roller (303) is mounted on the top plate (1). The first ink outlet chamber housing (304) is fixedly mounted on the bottom of the top plate (1). The bottom of the first ink outlet chamber housing (304) is connected to a first nozzle (305). The second ink outlet chamber housing (306) is fixedly mounted on the other side of the bottom of the top plate (1). The bottom of the second ink outlet chamber housing (306) is connected to a second nozzle (307). The first nozzle (305) and the second nozzle (307) are staggered.

2. The automatic ink supply device for a high-speed printing press according to claim 1, characterized in that: The ink pump assembly (2) includes a main ink cartridge (201), an ink pump (202), a secondary ink cartridge (203), and a negative pressure pump (204). The main ink cartridge (201) is connected to the ink inlet hose. The ink outlet of the main ink cartridge (201) is connected to the ink pump (202) through a hose. The ink pump (202) is connected to the secondary ink cartridge (203) through a hose. The secondary ink cartridge (203) supplies ink to the first ink outlet chamber housing (304) and the second ink outlet chamber housing (306) through a hose. The negative pressure pump (204) is connected to the first ink outlet chamber housing (304) and the second ink outlet chamber housing (306) through a pipe, and regulates the air pressure inside the first ink outlet chamber housing (304) and the second ink outlet chamber housing (306) through an air pipe.

3. The automatic ink supply device for a high-speed printing press according to claim 1, characterized in that: The coating roller (303) is disposed between the scraper (301), and the distance between the coating roller (303) and the scraper (301) is 1-2 mm.

4. The automatic ink supply device for a high-speed printing press according to claim 1, characterized in that: The first nozzle (305) and the second nozzle (307) are respectively disposed on the left and right sides of the coating roller (303), and the ink droplets discharged by the first nozzle (305) and the second nozzle (307) fall into the gap between the scraper (301) and the coating roller (303).

5. The automatic ink supply device for a high-speed printing press according to claim 2, characterized in that: The negative pressure pump (204) is connected to the first ink outlet chamber housing (304) and the second ink outlet chamber housing (306) respectively through independent air pressure sensors, and dynamically adjusts the ink flow rate of the first printhead (305) and the second printhead (307) according to the real-time air pressure value.

6. The automatic ink supply device for a high-speed printing press according to claim 1, characterized in that: The surface of the coating roller (303) is provided with a spiral guide groove, the depth of which is 0.5-1mm and the spiral angle of which is 15°-30°.

7. The automatic ink supply device for a high-speed printing press according to claim 1, characterized in that: The axial direction of the first nozzle (305) and the second nozzle (307) forms an angle of 45°-60° with the rotation direction of the coating roller (303), and the aperture of the first nozzle (305) and the second nozzle (307) is 0.3-0.5mm.

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