Eight-color printing machine with automatic filling function

Abstract

The invention relates to the technical field of printing machines, in particular to an automatic filling eight-color printing machine which comprises a printing machine body, a filling mechanism and a cleaning mechanism. The filling mechanism communicates with a pigment box of the printing machine body and is used for automatically adding pigment into the pigment box of the printing machine body. The cleaning mechanism is arranged on the filling mechanism; the filling mechanism comprises a storage bin, a material pump and a floating ball switch, the feeding end of the material pump communicates with the storage bin, and the discharging end of the material pump communicates with a pigment box of the printing machine body; when the material liquid in the pigment box drops to a low liquid level, the floating ball switch can control the material pump to supplement the material liquid to the pigment box; and when the material liquid in the pigment box is supplemented to a preset material level, the floating ball switch can control the material pump to stop supplementing the liquid to the pigment box. According to the storage bin cleaning device, rotary scraping can be conducted on the inner wall and the bottom of the storage bin, caking can be effectively prevented from being formed on the inner wall of the storage bin, and the cleaning quality of the interior of the storage bin can be improved when the storage bin is cleaned.

Description

Technical Field

[0001] This invention belongs to the field of printing press technology, and specifically relates to an eight-color printing press with automatic filling. Background Technology

[0002] An eight-color printing press is a high-end printing device capable of simultaneously printing up to eight colors in a single process. It is a complex machine integrating mechanics, electrical systems, automatic control, and precision printing technology. Eight-color printing presses can replace traditional digital printing processes such as screen printing, pad printing, and heat transfer printing, and can directly print images onto various materials including metal, plastic, wood, and glass. Features include no need for plate making, simple operation, and an automatic cleaning system. It can precisely control the printing position to prevent misalignment, significantly improving color reproduction and production efficiency, and is particularly suitable for printing images with complex color transitions.

[0003] A search revealed that Chinese Patent Publication No. CN215970629U, authorized on March 8, 2022, discloses an eight-color printing machine, comprising a housing, a belt conveyor, printing devices, an ink drying device, and a cooling circulation device. The housing has an inlet and an outlet at both ends. Eight sets of printing devices are spaced apart along the direction from the inlet to the outlet, located above the housing. An ink drying device is located between every two sets of printing devices. The ink drying device includes a drying chamber, a heating rod, a ventilation duct, and a fan. The drying chamber is located above the belt conveyor, with an open bottom. The heating rod is horizontally positioned inside the drying chamber. The ventilation duct is connected to the top of the housing, and the fan is connected to one end of the ventilation duct. A connecting pipe connects the drying chamber and the ventilation duct. This application has the effect of improving printing quality and efficiency.

[0004] However, this device still has the following drawbacks: pigment replenishment relies on manual operation, requiring operators to monitor the liquid level changes in each pigment tank in real time and manually add pigment when it is insufficient. Manual filling is not only labor-intensive but also prone to delays, leading to printing interruptions and severely impacting printing efficiency. Summary of the Invention

[0005] To address the above problems, the present invention provides an eight-color printing press with automatic filling, comprising a printing press body, a filling mechanism, and a cleaning mechanism;

[0006] The filling mechanism is connected to the pigment tank of the printing press body, and the filling mechanism is used to automatically add pigment to the pigment tank of the printing press body;

[0007] The cleaning mechanism is mounted on the packing mechanism and is used to clean the packing mechanism.

[0008] The filling mechanism includes a storage bin, a pump, and a float switch. The feed end of the pump is connected to the storage bin, and the discharge end of the pump is connected to the pigment box of the printing press body. The float switch is located on the pigment box of the printing press body.

[0009] When the liquid level in the pigment tank drops to a low level, the float switch can control the material pump to replenish the liquid in the pigment tank;

[0010] When the liquid in the pigment tank is replenished to the preset level, the float switch can control the material pump to stop replenishing the pigment tank.

[0011] In one embodiment of this application, a scraping mechanism is provided on the top of the storage bin. The scraping mechanism includes a motor, a transmission rod, and a scraper. The motor is fixedly installed on the storage bin, and the output end of the motor is connected to the transmission rod through a coupling. The scraper is disposed on the side wall of the transmission rod and is in contact with the inner wall of the storage bin.

[0012] In one embodiment of this application, a connecting plate is provided on the side wall of the transmission rod, the connecting plate is fixedly connected to the scraper, and a plurality of cutting plates are fixedly connected to the connecting plate, and one side of each of the plurality of cutting plates is provided as an arc surface;

[0013] When the cutting plate rotates, the curved surface of the cutting plate comes into contact with the liquid material, which causes the liquid material to rise.

[0014] In one embodiment of this application, the cleaning mechanism includes a liquid storage tank for storing cleaning liquid in a cleaning storage silo. The liquid storage tank is connected to the storage silo via a water pump, and the outlet of the water pump is connected to a spray assembly for spraying cleaning liquid into the storage silo.

[0015] In one embodiment of this application, the spray assembly includes a spray head and a housing. The housing is disposed on the top of the storage silo, the spray head is hinged to the liquid storage tank, the spray head is located inside the liquid storage tank, and the housing covers the spray head.

[0016] In one embodiment of this application, the storage bin is provided with a transmission mechanism, which is used to adjust the spray direction of the spray head;

[0017] The transmission mechanism includes a ratchet and a pawl. The ratchet and the pawl are connected in a transmission connection. The ratchet is keyed to the transmission rod. The pawl is rotatably mounted on the storage bin. A linkage mechanism is hinged to one side of the pawl. The linkage mechanism can drive the spray head to swing.

[0018] In one embodiment of this application, the linkage mechanism includes a movable rod and a strip-shaped hole. One end of the movable rod is connected to the pawl for transmission. The side of the movable rod away from the pawl has a strip-shaped hole, and the liquid inlet end of the spray head is slidably installed in the strip-shaped hole.

[0019] In one embodiment of this application, a spring is fixedly connected to the side of the pawl, and one end of the spring is fixedly connected to the storage bin. The spring is used to push the pawl to contact the ratchet.

[0020] In one embodiment of this application, the discharge end of the material pump is connected to a three-way pipe, and a reversing valve is installed on the three-way pipe. The material pump is connected to a collection box through the three-way pipe, and the collection box is used to collect cleaning wastewater.

[0021] In one embodiment of this application, the side of the scraper away from the storage bin is configured as an arc-shaped surface;

[0022] As the scraper rotates following the drive rod, it can flip the liquid material upwards, allowing the cutting plate to cut the liquid material.

[0023] The beneficial effects of this invention are:

[0024] 1. When cleaning the storage silo is required, the cleaning solution in the storage tank is sprayed into the silo through the spray head by a water pump. The motor drives the ratchet to rotate. When the ratchet rotates, the protrusion of the ratchet abuts against the pawl, squeezing the pawl and causing the pawl to move the movable rod. When the movable rod moves, it can push the liquid inlet end of the spray head, so that the spray head rotates around the hinge part as the axis, which can adjust the spray direction of the spray head and thus adjust the spray range. At the same time, the motor can drive the transmission rod to rotate, which in turn drives the connecting plate and scraper to rotate and scrape the inner wall and bottom of the storage silo. This can effectively prevent the formation of clumps on the inner wall of the storage silo and improve the cleaning quality of the storage silo.

[0025] 2. When cleaning the inner wall of the storage silo, the motor drives the transmission rod, which in turn drives the connecting plate to rotate the scraper. The scraper scrapes the material from the inner wall of the storage silo. This prevents the liquid from forming clumps on the inner wall after prolonged standing. Furthermore, the rotation of the connecting plate also drives the cutting plate, which cuts the scraped material, further preventing clumping and facilitating subsequent cleaning of the storage silo, thus reducing cleaning time.

[0026] 3. After the pawl is pushed by the ratchet, the pawl rotates. When the pawl rotates, it squeezes the spring. The spring is compressed and generates a reaction force. When the squeezing force of the ratchet protrusion on the pawl is released, the reaction force of the spring pushes the pawl back to its original position. At the same time, the pawl drives the movable rod to return to its original position, thereby resetting the spray head and completing the swinging action of the spray head. When the next protrusion of the pawl rotates to the position of the pawl, the rotation and reset of the pawl, as well as the swinging and reset action of the spray head, can be repeated. This ensures that the pawl pushes the movable rod to reciprocate normally, allowing the spray head to swing and spray the cleaning solution normally.

[0027] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of the structure according to an embodiment of the present invention is shown.

[0030] Figure 2 An embodiment of the present invention is shown. Figure 1 Enlarged schematic diagram of the structure of section A in the middle.

[0031] Figure 3 A partially enlarged schematic diagram of a storage silo according to an embodiment of the present invention is shown.

[0032] Figure 4 A schematic cross-sectional view of a storage silo according to an embodiment of the present invention is shown.

[0033] Figure 5 An embodiment of the present invention is shown. Figure 4 Enlarged schematic diagram of section B in the middle.

[0034] Figure 6 An embodiment of the present invention is shown. Figure 4 Enlarged schematic diagram of the C-section structure.

[0035] Figure 7 A schematic diagram of the pawl is shown according to an embodiment of the present invention.

[0036] Figure 8A partially enlarged schematic diagram of the pawl according to an embodiment of the present invention is shown.

[0037] Figure 9 A schematic diagram of the movable rod according to an embodiment of the present invention is shown.

[0038] In the diagram: 1. Printing machine body; 101. Movable rod; 102. Strip hole; 2. Filling mechanism; 3. Cleaning mechanism; 301. Liquid storage tank; 302. Water pump; 4. Material storage bin; 5. Material pump; 6. Float switch; 7. Scraping mechanism; 701. Motor; 702. Transmission rod; 703. Scraper; 704. Connecting plate; 705. Cutting plate; 8. Spray assembly; 801. Spray head; 802. Housing; 9. Transmission mechanism; 901. Ratchet; 902. Pad; 10. Linkage mechanism; 11. Spring; 12. T-connector; 13. Reversing valve; 14. Collection box. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] This invention provides an eight-color printing press with automatic filling, see below. Figures 1-9 It includes the printing press body 1, the filling mechanism 2, and the cleaning mechanism 3;

[0041] The filling mechanism 2 is connected to the pigment box of the printing press body 1, and the filling mechanism 2 is used to automatically add pigment to the pigment box of the printing press body 1.

[0042] The cleaning mechanism 3 is disposed on the packing mechanism 2, and the cleaning mechanism 3 is used to clean the packing mechanism 2;

[0043] The filling mechanism 2 includes a storage bin 4, a material pump 5, and a float switch 6. The inlet end of the material pump 5 is connected to the storage bin 4, and the outlet end of the material pump 5 is connected to the pigment box of the printing machine body 1. The float switch 6 is installed on the pigment box of the printing machine body 1.

[0044] When the liquid level in the pigment tank drops to a low level, the float switch 6 can control the material pump 5 to replenish the liquid in the pigment tank;

[0045] When the liquid in the pigment tank is replenished to the preset level, the float switch 6 can control the material pump 5 to stop replenishing the pigment tank.

[0046] Specifically, when the liquid level in the pigment tank of the printing press body 1 decreases, the float switch 6 sends a signal to the PLC controller, which controls the material pump 5 to replenish the pigment tank. After the liquid level in the pigment tank reaches the preset value, the float switch sends a signal to the PLC controller, which controls the material pump 5 to stop feeding. This can automatically add liquid to the pigment tank, reduce the workload of workers, and improve printing efficiency.

[0047] When cleaning of the storage silo 4 is required, the cleaning solution in the storage tank 301 is sprayed into the storage silo 4 through the spray head 801 by the water pump 302. The motor 701 operates, driving the ratchet 901 to rotate. When the ratchet 901 rotates, the protrusion of the ratchet 901 abuts against the pawl 902, squeezing the pawl 902, causing the pawl 902 to move the movable rod 101. As the movable rod 101 moves, it can push the liquid inlet end of the spray head 801, thereby enabling the spray head 801 to... Rotating around the hinge point allows adjustment of the spray direction of the spray head 801, thereby adjusting the spray range of the spray head 801. Simultaneously, as the motor 701 rotates, it drives the transmission rod 702 to rotate, which in turn drives the connecting plate 704 and the scraper 703 to rotate and scrape the inner wall and bottom of the storage bin 4. This effectively prevents the formation of clumps on the inner wall of the storage bin 4 and improves the cleaning quality of the storage bin 4 during cleaning.

[0048] For example, a scraping mechanism 7 is provided on the top of the storage bin 4. The scraping mechanism 7 includes a motor 701, a transmission rod 702 and a scraper 703. The motor 701 is fixedly installed on the storage bin 4. The output end of the motor 701 is connected to the transmission rod 702 through a coupling. The scraper 703 is provided on the side wall of the transmission rod 702 and is in contact with the inner wall of the storage bin 4.

[0049] A connecting plate 704 is provided on the side wall of the transmission rod 702. The connecting plate 704 is fixedly connected to the scraper 703. A plurality of cutting plates 705 are fixedly connected to the connecting plate 704. One side of each of the plurality of cutting plates 705 is set as an arc surface.

[0050] When the cutting plate 705 rotates, the arc-shaped surface of the cutting plate 705 comes into contact with the liquid material, which causes the liquid material to rise.

[0051] The side of the scraper 703 away from the storage bin 4 is configured as an arc-shaped surface;

[0052] When the scraper 703 rotates following the transmission rod 702, it can flip the liquid material upward, so that the cutting plate 705 can cut the liquid material.

[0053] Using the above scheme, when cleaning the inner wall of the storage silo 4, the motor 701 operates, driving the transmission rod 702 to operate, causing the connecting plate 704 to drive the scraper 703 to rotate. The scraper 703 scrapes the material from the inner wall of the storage silo 4. On the one hand, this prevents the liquid from forming clumps on the inner wall after prolonged standing. On the other hand, the rotation of the connecting plate 704 drives the cutting plate 705 to rotate, which cuts the liquid scraped off by the scraper 703, further preventing the liquid from forming clumps after prolonged standing. This also facilitates subsequent cleaning of the storage silo 4 and reduces cleaning time.

[0054] For example, the cleaning mechanism 3 includes a liquid storage tank 301, which is used to store the cleaning liquid in the cleaning storage bin 4. The liquid storage tank 301 is connected to the storage bin 4 through a water pump 302. The outlet end of the water pump 302 is connected to a spray assembly 8, which is used to spray the cleaning liquid into the storage bin 4.

[0055] The spray assembly 8 includes a spray head 801 and a housing 802. The housing 802 is disposed on the top of the storage bin 4. The spray head 801 is hinged to the liquid storage tank 301 and is located inside the liquid storage tank 301. The housing 802 covers the spray head 801.

[0056] Specifically, during cleaning, the water pump 302 operates to extract the cleaning fluid from the storage tank 301, and then sprays it into the storage bin 4 through the spray head 801. The motor 701 operates to drive the scraper 703 to rotate, which can scrape and wash the tank wall of the storage bin 4, reducing manual operation.

[0057] For example, the storage bin 4 is provided with a transmission mechanism 9, which is used to adjust the spraying direction of the spray head 801;

[0058] The transmission mechanism 9 includes a ratchet 901 and a pawl 902. The ratchet 901 and the pawl 902 are connected in a transmission manner. The ratchet 901 is keyed to the transmission rod 702. The pawl 902 is rotatably mounted on the storage bin 4. A linkage mechanism 10 is hinged to one side of the pawl 902. The linkage mechanism 10 can drive the spray head 801 to swing.

[0059] The linkage mechanism 10 includes a movable rod 101 and a strip hole 102. One end of the movable rod 101 is connected to the pawl 902. The side of the movable rod 101 away from the pawl 902 has a strip hole 102. The liquid inlet end of the spray head 801 is slidably installed in the strip hole 102.

[0060] Using the above scheme, during cleaning, the motor 701 operates, driving the transmission rod 702 to rotate, which in turn drives the ratchet 901 to rotate. When the ratchet 901 rotates, the protrusion of the ratchet 901 can push the pawl 902 to rotate, which in turn causes the pawl 902 to push the movable rod 101 to move. When the movable rod 101 moves, it can push the liquid inlet end of the spray head 801 to swing around the hinged mounting part as the axis. This can expand the spray range of the spray head 801 and increase the cleaning range of the cleaning liquid when cleaning the storage bin 4.

[0061] For example, a spring 11 is fixedly connected to the side of the pawl 902, and one end of the spring 11 is fixedly connected to the storage bin 4. The spring 11 is used to push the pawl 902 to contact the ratchet 901.

[0062] Using the above scheme, after the pawl 902 is pushed by the ratchet 901, the pawl 902 rotates. When the pawl 902 rotates, it squeezes the spring 11. The spring 11 is compressed and generates a reaction force. When the squeezing force of the protrusion of the ratchet 901 on the pawl 902 is released, the reaction force of the spring 11 pushes the pawl 902 to reset. At the same time, the pawl 902 drives the movable rod 101 to reset, thereby resetting the spray head 801 and completing the swinging action of the spray head 801. When the next protrusion of the pawl 902 rotates to the position of the pawl 902, the pawl 902 can repeatedly rotate and reset, and the spray head 801 can repeatedly swing and reset. This ensures that the pawl 902 pushes the movable rod 101 to reciprocate normally, so that the spray head 801 can swing and spray the cleaning liquid normally.

[0063] For example, the discharge end of the material pump 5 is connected to a three-way pipe 12, and a reversing valve 13 is provided on the three-way pipe 12. The material pump 5 is connected to a collection box 14 through the three-way pipe 12, and the collection box 14 is used to collect cleaning wastewater.

[0064] By adopting the above scheme, the discharge direction of the storage bin 4 can be freely changed according to the needs of filling and cleaning operations through the cooperation of the three-way pipe 12 and the reversing valve 13, thereby reducing the number of pipeline outputs of the storage bin 4 and reducing space occupation.

[0065] In summary, the working principle of this application is as follows:

[0066] When the liquid level in the pigment tank of the printing press body 1 drops, the float switch 6 sends a signal to the PLC controller. The PLC controller controls the material pump 5 to replenish the pigment tank. After the liquid level in the pigment tank reaches the preset value, the float switch sends a signal to the PLC controller. The PLC controller controls the material pump 5 to stop feeding. This can automatically add liquid to the pigment tank, which can reduce the workload of workers and improve printing efficiency.

[0067] When cleaning of the storage silo 4 is required, the cleaning solution in the storage tank 301 is sprayed into the storage silo 4 through the spray head 801 by the water pump 302. The motor 701 operates, driving the ratchet 901 to rotate. When the ratchet 901 rotates, the protrusion of the ratchet 901 abuts against the pawl 902, squeezing the pawl 902. This causes the pawl 902 to move the movable rod 101. As the movable rod 101 moves, it pushes the liquid inlet end of the spray head 801, causing the spray head 801 to rotate around the hinged part. This allows adjustment of the spray direction and spray range of the spray head 801. After the pawl 902 is pushed by the ratchet 901, the pawl 902 rotates. During this rotation, the pawl 902 compresses the spring 11, causing the spring 11 to compress and generate a reaction force. This force is applied to the pawl 902 by the protrusion of the ratchet 901. When the squeezing pressure is released, the reaction force of the spring 11 pushes the pawl 902 to reset. At the same time, the pawl 902 drives the movable rod 101 to reset, thereby resetting the spray head 801 and completing the swinging action of the spray head 801. When the protrusion of the pawl 902 rotates to the position of the pawl 902, the pawl 902 can repeatedly rotate and reset, and the spray head 801 can repeatedly swing and reset. This ensures that the pawl 902 pushes the movable rod 101 to reciprocate normally, so that the spray head 801 can swing and spray the cleaning liquid normally. At the same time, when the motor 701 rotates, it can drive the transmission rod 702 to rotate, thereby driving the connecting plate 704 and the scraper 703 to rotate. This can rotate and scrape the inner wall and bottom of the storage bin 4, which can effectively prevent the formation of clumps on the inner wall of the storage bin 4 and improve the cleaning quality of the storage bin 4.

[0068] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An eight-color printing press with automatic filling, characterized in that: It includes the printing press body (1), the filling mechanism (2) and the cleaning mechanism (3); The filling mechanism (2) is connected to the pigment box of the printing press body (1), and the filling mechanism (2) is used to automatically add pigment to the pigment box of the printing press body (1); The cleaning mechanism (3) is disposed on the packing mechanism (2), and the cleaning mechanism (3) is used to clean the packing mechanism (2); The filling mechanism (2) includes a storage bin (4), a material pump (5) and a float switch (6). The inlet end of the material pump (5) is connected to the storage bin (4), and the outlet end of the material pump (5) is connected to the pigment box of the printing machine body (1). The float switch (6) is installed on the pigment box of the printing machine body (1). When the liquid level in the pigment tank drops to a low level, the float switch (6) can control the pump (5) to replenish the liquid in the pigment tank; When the liquid in the pigment tank is replenished to the preset level, the float switch (6) can control the material pump (5) to stop replenishing the liquid in the pigment tank.

2. The eight-color printing machine with automatic filling according to claim 1, characterized in that: The top of the storage bin (4) is provided with a scraping mechanism (7), which includes a motor (701), a transmission rod (702) and a scraper (703). The motor (701) is fixedly installed on the storage bin (4). The output end of the motor (701) is connected to the transmission rod (702) through a coupling. The scraper (703) is set on the side wall of the transmission rod (702) and is in contact with the inner wall of the storage bin (4).

3. An eight-color printing machine with automatic filling according to claim 2, characterized in that: A connecting plate (704) is provided on the side wall of the transmission rod (702). The connecting plate (704) is fixedly connected to the scraper (703). A plurality of cutting plates (705) are fixedly connected on the connecting plate (704). One side of each of the plurality of cutting plates (705) is set as an arc surface. When the cutting plate (705) rotates, the arc-shaped surface of the cutting plate (705) comes into contact with the liquid material, which causes the liquid material to rise.

4. An eight-color printing machine with automatic filling according to claim 3, characterized in that: The cleaning mechanism (3) includes a liquid storage tank (301) for storing cleaning liquid in the cleaning storage bin (4). The liquid storage tank (301) is connected to the storage bin (4) via a water pump (302). The outlet end of the water pump (302) is connected to a spray assembly (8) for spraying cleaning liquid into the storage bin (4).

5. An eight-color printing machine with automatic filling according to claim 4, characterized in that: The spray assembly (8) includes a spray head (801) and a housing (802). The housing (802) is disposed on the top of the storage bin (4). The spray head (801) is hinged to the liquid storage tank (301) and is located inside the liquid storage tank (301). The housing (802) covers the spray head (801).

6. An eight-color printing machine with automatic filling according to claim 5, characterized in that: The storage bin (4) is provided with a transmission mechanism (9), which is used to adjust the spraying direction of the spray head (801); The transmission mechanism (9) includes a ratchet (901) and a pawl (902). The ratchet (901) is connected to the pawl (902) in a transmission connection. The ratchet (901) is keyed to the transmission rod (702). The pawl (902) is rotatably mounted on the storage bin (4). A linkage mechanism (10) is hinged to one side of the pawl (902). The linkage mechanism (10) can drive the spray head (801) to swing.

7. An eight-color printing machine with automatic filling according to claim 6, characterized in that: The linkage mechanism (10) includes a movable rod (101) and a strip hole (102). One end of the movable rod (101) is connected to the pawl (902) for transmission. A strip hole (102) is provided on the side of the movable rod (101) away from the pawl (902). The liquid inlet end of the spray head (801) is slidably installed in the strip hole (102).

8. An eight-color printing machine with automatic filling according to claim 7, characterized in that: A spring (11) is fixedly connected to the side of the pawl (902), and one end of the spring (11) is fixedly connected to the storage bin (4). The spring (11) is used to push the pawl (902) to contact the ratchet (901).

9. An eight-color printing machine with automatic filling according to claim 1, characterized in that: The discharge end of the material pump (5) is connected to a three-way pipe (12), and a reversing valve (13) is installed on the three-way pipe (12). The material pump (5) is connected to a collection box (14) through the three-way pipe (12), and the collection box (14) is used to collect cleaning wastewater.

10. An eight-color printing machine with automatic filling according to claim 3, characterized in that: The side of the scraper (703) away from the storage bin (4) is set as an arc surface; When the scraper (703) rotates following the transmission rod (702), it can turn the liquid material upward so that the cutting plate (705) can cut the liquid material.

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