A doctor blade ink supply system for corrugated board printing
The design of the doctor blade ink supply system has enabled efficient use of ink and water in the corrugated cardboard printing process and simplified cleaning, solving the problems of low ink and water utilization and high printing costs, and simplifying post-printing cleaning and wastewater treatment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUANG DONG TAI YI PRECISION MASCH CO LTD
- Filing Date
- 2026-02-06
- Publication Date
- 2026-06-05
AI Technical Summary
In the existing technology, the water and ink utilization rate is low, the printing cost is high, and the post-printing cleaning is difficult and the wastewater treatment is complicated.
The system employs a doctor blade ink supply system, which includes an anilox roller, a doctor blade assembly seat, an ink receiving module, an ink supply module, an ink tank, and an atomizing ink collection module. The spray unit of the atomizing ink collection module sprays the anilox roller and the ink receiving tray to recover residual ink. Combined with the ink supply module and the cleaning structure, the system improves ink utilization and reduces the amount of ink used in printed materials.
It improves ink return efficiency, enhances ink and water utilization, reduces printing costs, and simplifies post-printing cleaning and wastewater treatment.
Smart Images
Figure CN122143482A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of corrugated board printing equipment technology, and in particular to a doctor blade ink supply system for corrugated board printing. Background Technology
[0002] With the development of corrugated cardboard printing technology, reducing printing costs and achieving environmentally friendly printing have become major research directions in printing technology development. In existing technologies, replacing ink-based printing with water-based ink printing can achieve environmentally friendly printing. Furthermore, regarding water-based ink printing, improving the ink return effect after printing and increasing the utilization rate of water and ink are issues that need to be addressed to enhance the environmental benefits of water-based ink printing technology. To reduce the unit cost of printed parts, it is necessary to reduce the amount of water and ink used per unit of printed product while ensuring the quality of printed products, and to reduce the ink content in the washing water after printing, making the treatment of printing wastewater easier and simpler. Summary of the Invention
[0003] The purpose of this invention is to provide a doctor blade ink supply system for printing on corrugated cardboard.
[0004] To achieve the above objectives, the present invention provides the following technical solution: A doctor blade ink supply system for corrugated cardboard printing includes an anilox roller, a doctor blade assembly seat, an ink receiving module, an ink supply module, an ink tank, and an atomizing ink collection module. The anilox roller is positioned in front of the doctor blade assembly; the doctor blade assembly includes a rear base, a doctor blade seat positioned at the front end of the rear base, a doctor blade holder connected to the bottom of the front end of the doctor blade seat, and a spray frame positioned at the top of the doctor blade seat; the doctor blade seat has an ink cavity recessed in the middle of its front end and an ink / water inlet / outlet communicating with the bottom center of the ink cavity at its rear end; the doctor blade holder has a blade section that penetrates between the anilox roller and the ink cavity, with the edge of the blade section contacting the anilox roller; the spray frame has a top frame section extending from the top of the doctor blade seat to above the rear end of the anilox roller; The ink receiving module includes an ink receiving tray for receiving ink and an ink return assembly pipe located below the rear end of the doctor blade assembly seat and the anilox roller for receiving ink and water, and an ink return assembly pipe for guiding ink and water from the ink receiving tray to the ink tank. The ink supply module includes an ink pump, a four-way valve connected to the ink pump to control the ink flow on / off or switch the flow direction, a first branch pipe connecting one interface of the four-way valve to the ink tank, and a second branch pipe connecting the other interface of the four-way valve to the ink inlet / outlet, so that the ink pump can input ink from the ink tank into the ink chamber or output ink from the ink chamber back to the ink tank. The atomizing ink collection module includes a first spray unit set on the top frame section and a second spray unit set on the ink receiving tray. When supplying and returning ink, the first spray unit sprays the anilox roller, and the second spray unit sprays the ink receiving tray. The residual ink is recovered into the ink tank by the atomized water flow.
[0005] As a further technical solution of the present invention: the bottom of the ink cavity is funnel-shaped, sloping down from both sides towards the ink inlet and outlet.
[0006] As a further technical solution of the present invention: the ink receiving plate forms an ink receiving slope extending from the rear end of the anilox roller to the doctor blade assembly seat, an ink receiving groove located at the end of the ink receiving slope, and two ink collecting hoppers located on both sides of the ink receiving slope and the ink receiving groove. The ink scraped off by the doctor blade section from the anilox roller falls into the ink receiving slope and flows along the ink receiving slope to the ink receiving groove, and from the ink receiving groove to the two ink collecting hoppers. The ink collecting hoppers guide the ink to the return ink assembly pipe.
[0007] As a further technical solution of the present invention: the ink return assembly includes an inclined ink return pipe, a vertical ink return pipe, a three-way ink return pipe, and an ink return tail pipe; the output port of one ink collection hopper is located on the side of the bottom facing another ink collection hopper, and the inclined ink return pipe is installed on the output port; the output port of the other ink collection hopper is set vertically downward at the bottom, and the vertical ink return pipe is installed on the output port; the upper interface of the three-way ink return pipe is connected to the vertical ink return pipe, the middle interface is connected to the inclined ink return pipe, and the lower interface is connected to the ink return tail pipe, and the ink is transported back to the ink tank through the ink return tail pipe.
[0008] As a further technical solution of the present invention: the first spraying unit includes a spray pipe disposed on the top frame section, with both ends of the spray pipe extending out from the top frame section. It is provided with a first control valve at the input end and a pressure relief valve at the output end, so as to control the amount of spraying of the spray pipe onto the anilox roller by the first control valve and the pressure relief valve.
[0009] As a further technical solution of the present invention: the second spray unit includes two spray nozzles and a liquid supply pipe for supplying water to the two spray nozzles. Each spray nozzle is correspondingly disposed on the side wall of an ink collection fountain. The liquid supply pipe is provided with a second control valve to spray water into the ink collection fountain through the spray nozzle and to control the spray volume of the spray nozzle through the second control valve.
[0010] As a further technical solution of the present invention: the doctor blade ink supply system for corrugated cardboard printing includes a cleaning structure, the cleaning structure including a cleaning tube disposed at the top of the rear end of the doctor blade seat and a plurality of cleaning nozzles disposed at intervals at the front end of the cleaning tube, each cleaning nozzle extending to the top of the ink chamber, so that the cleaning structure cleans the ink chamber after ink return.
[0011] As a further technical solution of the present invention: the ink cavity of the doctor blade holder extends through both sides, and the doctor blade holder is provided with return guide grooves communicating with the ink cavity on both sides, with each return guide groove located above the ink collection hopper on the same side.
[0012] As a further technical solution of the present invention: the rear base is provided with two roller mounting arms on both sides, and the anilox roller is positioned in front of the scraper assembly seat by the two roller mounting arms.
[0013] As a further technical solution of the present invention: each side of the rear base has a locking pin at the top for locking the loading arm on the same side, and a drive cylinder at the bottom for connecting to the loading arm and being able to push and pull the loading arm.
[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention proposes a doctor blade ink supply system for corrugated cardboard printing. Through the cooperation between the anilox roller, doctor blade assembly seat, ink receiving module, ink supply module, water ink tank and atomizing ink collection module, it can spray the anilox roller with the first spray unit of the atomizing ink collection module and spray the ink receiving disk with the second spray unit during ink return. The residual water ink is recovered with the atomized water flow, which effectively improves the ink return effect and water ink utilization rate. While ensuring the quality of printed products, it reduces the amount of water ink used per unit of printed product and reduces the ink content in the cleaning water after printing, making the treatment of printing wastewater easier and simpler. Attached Figure Description
[0015] Figure 1 A first schematic diagram of a doctor blade ink supply system for printing on corrugated cardboard.
[0016] Figure 2 A second schematic diagram of a doctor blade ink supply system for printing on corrugated cardboard.
[0017] Figure 3 This is a schematic diagram of the ink supply module.
[0018] Figure 4 This is the first schematic diagram of the scraper assembly seat.
[0019] Figure 5 A cross-sectional view of a doctor blade ink supply system for printing on corrugated cardboard.
[0020] Figure 6 This is a cross-sectional view of the scraper assembly seat.
[0021] Figure 7 This is a second schematic diagram of the scraper assembly seat.
[0022] Figure 8 This is a schematic diagram of the ink tray connection. Detailed Implementation
[0023] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of protection of the present invention.
[0024] Please see Figure 1 , Figure 2 A doctor blade ink supply system for corrugated cardboard printing includes an anilox roller 10, a doctor blade assembly seat 20, an ink receiving module 30, an ink supply module 40, an ink tank 50, and an atomizing ink collection module 60. The anilox roller 10 is positioned in front of the doctor blade assembly 20; the doctor blade assembly 20 includes a rear base 21, a doctor blade seat 22 positioned at the front end of the rear base 21, a doctor blade holder 23 connected to the bottom of the front end of the doctor blade seat 22, and a spray holder 24 positioned at the top of the doctor blade seat 22; the doctor blade seat 22 has an ink cavity 221 recessed in the middle of its front end, extending to both sides, an ink / water inlet / outlet 222 communicating with the bottom center of the ink cavity 221 at its rear end, and ink / water outlets 222 on its sides opposite to the ink cavity 221. 1. A connected return guide trough 223; the bottom of the ink cavity 221 is funnel-shaped, sloping down from both sides towards the ink inlet / outlet 222, so that the ink entering the ink cavity 221 from the ink inlet / outlet 222 spreads to both sides; the doctor blade holder 23 is formed with a blade section 231 that penetrates between the anilox roller 10 and the ink cavity 221, with the blade edge of the blade section 231 contacting the anilox roller 10; the spray frame 24 is formed with a top frame section 241 that extends from the top of the doctor blade holder 22 to above the rear end of the anilox roller 10; The ink receiving module 30 includes an ink receiving tray 31 for receiving ink and an ink return assembly pipe 32 for guiding ink from the ink receiving tray 31 to the ink tank 50, which is located below the rear end of the doctor blade assembly seat 20 and the anilox roller 10. See also Figure 3 The ink supply module 40 includes an ink pump 41, a four-way valve 42 connected to the ink pump 41 for controlling the ink flow on / off or switching the flow direction, a first branch pipe 43 connecting one interface of the four-way valve 42 to the ink tank 50, and a second branch pipe 44 connecting the other interface of the four-way valve 42 to the ink inlet / outlet 222, so that the ink pump 41 can input ink from the ink tank 50 into the ink chamber 221 or output ink from the ink chamber 221 back to the ink tank 50; See Figure 2 , Figure 6 The atomizing ink collection module 60 includes a first spray unit 61 disposed on the top frame section 241 and a second spray unit 62 disposed on the ink receiving tray 31. When supplying ink, the first spray unit 61 sprays the anilox roller 10, and the second spray unit 62 sprays the ink receiving tray 31. The residual ink is recovered into the ink tank 50 with the atomized water flow.
[0025] Furthermore, in conjunction with reference Figure 4 , Figure 6 In this embodiment, a plurality of hinges 201 are provided between the rear base 21 and the scraper seat 22. Each hinge 201 connects the bottom front end of the rear base 21 to the bottom surface of the scraper seat 22, so that the scraper seat 22 can swing relative to the rear base 21.
[0026] Furthermore, in conjunction with reference Figure 7In this embodiment, the spray frame 24 has a limiting plate 242 extending from the top of the scraper seat 22 to the top of the rear base 21. The limiting plate 242 has several elongated holes 202 spaced apart, through which bolts pass and into the top of the rear base 21, thus limiting the swing amplitude of the scraper seat 22 relative to the rear base 21.
[0027] Furthermore, in conjunction with reference Figure 5 , Figure 6 In this embodiment, the rear base 21 is provided with an airbag 203 that abuts against the scraper seat 22 and a slot for holding the airbag 203 in the middle section of the front end. The front end of the airbag 203 is connected to the rear end of the scraper seat 22, so that the airbag 203 expands and contracts under the air supply of an external air source, driving the scraper seat 22 to swing relative to the rear base 21.
[0028] Furthermore, in this embodiment, the rear base 21 is provided with two roller mounting arms 25 on opposite sides, and the anilox roller 10 is positioned in front of the scraper assembly seat 20 by the two roller mounting arms 25. The two roller mounting arms 25 are provided with bearing seats (not shown) for the two ends of the anilox roller 10 to be installed.
[0029] For further details, please refer to [link / reference]. Figure 7 In this embodiment, each side of the rear base 21 has a locking pin 251 at the top for locking the roller arm 25 and a drive cylinder 252 at the bottom for pushing and pulling the roller arm 25. When the anilox roller 10 needs to be disassembled, the locking pin 251 is released from locking the roller arm 25, and the drive cylinder 252 pushes the roller arm 25 out relative to the rear base 21.
[0030] Furthermore, in conjunction with reference Figure 8 In this embodiment, the ink receiving tray 31 forms an ink receiving slope 311 extending from the anilox roller 10 to the rear end of the doctor blade assembly seat 20, an ink receiving groove 312 located at the end of the ink receiving slope 311, and two ink collecting hoppers 313 located on both sides of the ink receiving slope 311 and the ink receiving groove 312. Each ink collecting hopper 313 is located below the return guide groove 223 on the same side. The ink scraped off by the doctor blade section 231 from the anilox roller 10 falls into the ink receiving slope 311 and flows along the ink receiving slope 311 to the ink receiving groove 312. From the ink receiving groove 312, it flows to the two ink collecting hoppers 313. The ink collecting hoppers 313 guide the ink to the return ink assembly pipe 32.
[0031] Furthermore, in this embodiment, the ink return combination pipe 32 includes an inclined ink return pipe 321, a vertical ink return pipe 322, a three-way ink return pipe 323, and an ink return tail pipe 324; the output port of one ink collection hopper 313 is located on the side of the bottom facing the other ink collection hopper 313, and the inclined ink return pipe 321 is installed on the output port; the output port of the other ink collection hopper 313 is set vertically downward at the bottom, and the vertical ink return pipe 322 is installed on the output port; the upper interface of the three-way ink return pipe 323 is connected to the vertical ink return pipe 322, the middle interface is connected to the inclined ink return pipe 321, and the lower interface is connected to the ink return tail pipe 324, and the ink is transported back to the ink tank 50 through the ink return tail pipe 324.
[0032] Furthermore, in this embodiment, the first spray unit 61 includes a spray pipe 611 disposed on the top frame section 241. The spray pipe 611 is provided with a plurality of spray heads that extend to the bottom surface of the top plate of the top frame section 241 at intervals. Both ends of the spray pipe 611 extend out from the top frame section 241. A first control valve 612 is provided at the input end and a pressure relief valve 613 is provided at the output end. The first control valve 612 and the pressure relief valve 613 control the amount of spray from the spray pipe 611 to the anilox roller 10.
[0033] Furthermore, in this embodiment, the second spray unit 62 includes two spray nozzles 621 and a liquid supply pipe 622 for supplying water to the two spray nozzles 621. Each spray nozzle 621 is correspondingly disposed on the side wall of an ink collection 313. The liquid supply pipe 622 is provided with a second control valve 623 to spray water into the ink collection 313 through the spray nozzles 621 and to control the spray volume of the spray nozzles 621 through the second control valve 623.
[0034] Furthermore, in this embodiment, the doctor blade ink supply system for corrugated cardboard printing includes a cleaning structure 70. The cleaning structure 70 includes a cleaning tube extending from the rear end of the rear base 21 to the top of the rear end of the doctor blade seat 22, and a plurality of cleaning nozzles spaced at the front end of the cleaning tube. Each cleaning nozzle extends to the top of the ink chamber 221, so that the cleaning structure 70 cleans the ink chamber 221 after ink return.
[0035] Furthermore, in this embodiment, the doctor blade ink supply system for corrugated cardboard printing includes a water supply structure 80, which supplies water to the atomizing ink collection module 60 and the cleaning structure 70. The water supply structure 80 includes a three-way inlet 81 connected to an external high-pressure water source, a first water supply pipe 82 connecting one interface of the three-way inlet 81 to the cleaning structure 70, and a branch water passage structure 83 connecting the other interface of the three-way inlet 81 to the atomizing ink collection module 60. A third control valve 801 is provided on the first water supply pipe 82 to control the operation of the cleaning structure 70.
[0036] Furthermore, in this embodiment, the branch waterway structure 83 includes a water storage tank 831, a second water supply pipe 832 connecting the inlet of the water storage tank 831 to the interface of the three-way inlet 81, and a three-way water supply pipe 833 connecting the outlet of the water storage tank 831 to the spray pipe 611 and the infusion pipe 622. The water storage tank 831 filters the water flow, reduces impurities, and prevents the spray pipe 611 and the spray nozzle 621 from becoming clogged.
[0037] Furthermore, in this embodiment, the doctor blade ink supply system for corrugated cardboard printing includes an air valve control system 90. The air valve control system 90 is provided with an air passage structure for supplying air to the four-way valve 42, the first control valve 612, the pressure relief valve 613, the second control valve 623, and the third control valve 801, and a solenoid valve 91 for controlling the opening and closing of the four-way valve 42, the first control valve 612, the pressure relief valve 613, the second control valve 623, and the third control valve 801.
[0038] Understandably, the method of using the doctor blade ink supply system for corrugated cardboard printing according to the present invention is as follows: During printing: the four-way valve 42 is open, and the first control valve 612, the second control valve 623, and the third control valve 801 are closed; the ink supply module 40 operates, and the ink pump 41 inputs water and ink from the water and ink tank 50 into the ink chamber 221, and the water and ink adhere to the anilox roller 10 from the ink chamber 221; the blade edge of the blade section 231 scrapes off excess water and ink from the anilox roller 10 as the anilox roller 10 rotates, and the scraped water and ink fall into the ink receiving slope 311, and flow along the ink receiving slope 311 to the ink receiving groove 312, and from the ink receiving groove 312 to two ink collection hoppers 313, the ink collection hoppers 313 guide the water and ink to the return ink combination pipe 32, and flow back to the water and ink channel along the return ink combination pipe 32; among them, the excess water and ink in the ink chamber 221 overflows from both sides of the ink chamber 221 into the return guide groove 223, and is output from the return guide groove 223 to the ink collection hopper 313.
[0039] After printing, during ink recycling: the four-way valve 42 reverses, the third control valve 801 remains closed, and the first control valve 612 and the second control valve 623 open intermittently; while the ink pump 41 pumps ink from the ink chamber 221 back to the ink tank 50, the spray pipe 611 sprays anilox roller 10, returning the residual ink in the anilox roller 10 and the ink chamber 221 to the ink tank 50 with the atomized water flow; the spray nozzle 621 sprays ink into the ink collection hopper 313, returning the residual ink in the ink collection hopper 313 to the ink tank 50 with the atomized water flow; After the ink return is completed, during cleaning: remove the ink tank 50 from the ink supply position so that the ink tank 50 is disconnected from the first branch pipe 43 and the ink return tail pipe 324; close the four-way valve 42, and open the first control valve 612, the second control valve 623 and the third control valve 801 to clean the anilox roller 10, the ink chamber 221 and the ink receiving tray 31 with water flow. After cleaning, return to printing mode.
[0040] In summary, the doctor blade ink supply system for corrugated cardboard printing of the present invention, through the cooperation of the anilox roller 10, doctor blade assembly seat 20, ink receiving module 30, ink supply module 40, water and ink tank 50 and atomizing ink collection module 60, enables the first spray unit 61 of the atomizing ink collection module 60 to spray the anilox roller 10 and the second spray unit 62 to spray the ink receiving disk 31 during ink return. The residual water and ink are recovered with the atomized water flow, effectively improving the ink return effect and water and ink utilization rate. While ensuring the quality of printed products, it reduces the amount of water and ink used per unit of printed product, reduces the ink content in the cleaning water after printing, and makes printing wastewater treatment easier and simpler.
[0041] Any combination of various embodiments of the present invention, provided it does not violate the inventive concept of the present invention, shall be regarded as the content disclosed by the present invention; within the scope of the technical concept of the present invention, any simple modifications to the technical solution and any combination of different embodiments that do not violate the inventive concept of the present invention shall be within the protection scope of the present invention.
Claims
1. A doctor blade ink supply system for printing on corrugated cardboard, characterized in that: It includes an anilox roller (10), a doctor blade assembly seat (20), an ink receiving module (30), an ink supply module (40), an ink tank (50), and an atomizing ink collection module (60). The anilox roller (10) is positioned in front of the doctor blade assembly (20); the doctor blade assembly (20) includes a rear base (21), a doctor blade seat (22) positioned at the front end of the rear base (21), a doctor blade holder (23) connected to the bottom of the front end of the doctor blade seat (22), and a spray frame (24) positioned at the top of the doctor blade seat (22); the doctor blade seat (22) has an ink cavity (221) recessed in the middle of the front end and an ink inlet / outlet (222) connected to the bottom center of the ink cavity (221) at the bottom of the rear end; the doctor blade holder (23) has a blade section (231) that penetrates between the anilox roller (10) and the ink cavity (221), with the edge of the blade section (231) contacting the anilox roller (10); the spray frame (24) has a top frame section (241) extending from the top of the doctor blade seat (22) to the rear end of the anilox roller (10). The ink receiving module (30) includes an ink receiving tray (31) for receiving ink and an ink return assembly pipe (32) for guiding ink from the ink receiving tray (31) to the ink tank (50) and located below the rear end of the doctor blade assembly seat (20) and the anilox roller (10). The ink supply module (40) includes an ink pump (41), a four-way valve (42) connected to the ink pump (41) for controlling the ink flow on / off or switching the flow direction, a first branch pipe (43) connecting one interface of the four-way valve (42) to the ink tank (50) and a second branch pipe (44) connecting the other interface of the four-way valve (42) to the ink inlet / outlet (222), so that the ink pump (41) can input ink from the ink tank (50) into the ink chamber (221) or output ink from the ink chamber (221) back to the ink tank (50); The atomizing ink collection module (60) includes a first spray unit (61) set on the top frame section (241) and a second spray unit (62) set on the ink receiving tray (31). When supplying ink, the first spray unit (61) sprays the anilox roller (10), and the second spray unit (62) sprays the ink receiving tray (31). The residual ink is recovered into the ink tank (50) with the atomized water flow.
2. The doctor blade ink supply system for corrugated cardboard printing according to claim 1, characterized in that: The bottom of the ink cavity (221) is funnel-shaped, sloping down from both sides towards the ink inlet / outlet (222).
3. The doctor blade ink supply system for corrugated cardboard printing according to claim 1, characterized in that: The ink receiving plate (31) has an ink receiving slope (311) extending from the anilox roller (10) to the rear end of the doctor blade assembly seat (20), an ink receiving groove (312) located at the end of the ink receiving slope (311), and two ink collecting hoppers (313) located on both sides of the ink receiving slope (311) and the ink receiving groove (312). The ink scraped off by the doctor blade section (231) from the anilox roller (10) falls into the ink receiving slope (311) and flows along the ink receiving slope (311) to the ink receiving groove (312), and from the ink receiving groove (312) to the two ink collecting hoppers (313). The ink collecting hoppers (313) guide the ink to the ink return assembly pipe (32).
4. The doctor blade ink supply system for corrugated cardboard printing according to claim 3, characterized in that: The ink return assembly (32) includes an inclined ink return pipe (321), a vertical ink return pipe (322), a three-way ink return pipe (323), and an ink return tail pipe (324); the output port of one ink collection hopper (313) is located on the bottom side facing the other ink collection hopper (313), and the inclined ink return pipe (321) is installed on the output port; the output port of the other ink collection hopper (313) is set vertically downward at the bottom, and the vertical ink return pipe (322) is installed on the output port; the upper interface of the three-way ink return pipe (323) is connected to the vertical ink return pipe (322), the middle interface is connected to the inclined ink return pipe (321), and the lower interface is connected to the ink return tail pipe (324), and the ink is transported back to the ink tank (50) through the ink return tail pipe (324).
5. The doctor blade ink supply system for corrugated cardboard printing according to claim 1, characterized in that: The first spray unit (61) includes a spray pipe (611) disposed on the top frame section (241). Both ends of the spray pipe (611) extend out from the top frame section (241). It is provided with a first control valve (612) at the input end and a pressure relief valve (613) at the output end. The first control valve (612) and the pressure relief valve (613) control the amount of spray from the spray pipe (611) to the anilox roller (10).
6. The doctor blade ink supply system for corrugated cardboard printing according to claim 3, characterized in that: The second spray unit (62) includes two spray nozzles (621) and a liquid supply pipe (622) for supplying water to the two spray nozzles (621). Each spray nozzle (621) is correspondingly disposed on the side wall of an ink collection fountain (313). The liquid supply pipe (622) is provided with a second control valve (623) for spraying water into the ink collection fountain (313) by the spray nozzle (621) and for controlling the spray volume of the spray nozzle (621) by the second control valve (623).
7. The doctor blade ink supply system for corrugated cardboard printing according to claim 1, characterized in that: The cleaning structure (70) includes a cleaning tube extending from the rear end of the rear base (21) to the top of the rear end of the scraper seat (22) and a plurality of cleaning nozzles spaced at the front end of the cleaning tube. Each cleaning nozzle extends to the top of the ink chamber (221) so that the cleaning structure (70) cleans the ink chamber (221) after ink return.
8. The doctor blade ink supply system for corrugated cardboard printing according to claim 1, characterized in that: The ink cavity (221) of the scraper holder (22) extends to both sides. The scraper holder (22) is provided with return guide grooves (223) on both sides that communicate with the ink cavity (221). Each return guide groove (223) is located above the ink collection hopper (313) on the same side.
9. The doctor blade ink supply system for corrugated cardboard printing according to claim 1, characterized in that: The rear base (21) has two roller mounting arms (25) on opposite sides, which are used to position the anilox roller (10) in front of the scraper assembly seat (20).
10. The doctor blade ink supply system for corrugated cardboard printing according to claim 9, characterized in that: Each side of the rear base (21) corresponding to the roller loading arm (25) on the same side is provided with a locking pin (251) at the top for locking the roller loading arm (25) and a drive cylinder (252) at the bottom for connecting to the roller loading arm (25) and being able to push and pull the roller loading arm (25).