Multi-stage color printing device for food packaging bag production

Abstract

The invention relates to the technical field of packaging bag printing, and discloses a multi-stage color printing device for food packaging bag production, the multi-stage color printing device comprises a printing platform, a printing box and a drying box, the bottom of the drying box is fixedly connected with a recovery tank, the recovery tank is internally provided with an ink recovery device, and the ink recovery device comprises a stirring mechanism, a flocculation mechanism and an extraction mechanism; the flocculation mechanism comprises a liquid storage box body, a one-way valve, a permeation pipe, a sliding plate, a fixed block and a telescopic spring. According to the multi-stage color printing device for food packaging bag production, in the rotating process of a rotating shaft, a liquid storage box can be driven to rotate, under the action of centrifugal force, a flocculating agent in the liquid storage box continuously flows, when flowing into a permeation pipe, the flocculating agent flows out of a small hole to the interior of a recovery tank, and after a motor stops rotating, the flocculating agent flows into the recovery tank; and the permeated flocculant can flocculate the ink in the recovery tank, so that suspended particles, colloidal substances and part of organic matters in the ink are effectively removed.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging bag printing, in particular to a multi-level color printing device for producing food packaging bags. Background Art

[0002] In the production process of food packaging bags, multi-level color printing is often required to attract consumers' attention and convey product information.

[0003] Traditional color printing equipment for food packaging bags has several shortcomings. After the printing process is completed, the ink remaining in the equipment's ink fountain, ink path, and printing plate is difficult to recover. Currently, the most common practice is to use chemical solvents for cleaning. This is not only a complex process, but the solvents themselves are flammable and explosive, which poses a safety hazard. They may also chemically react with the ink, reducing the quality of the recovered ink. The lag in ink recovery technology has led to the waste of large amounts of reusable ink, which not only increases production costs but also pollutes the environment, violating the current principles of green production and efficient resource utilization. How to efficiently and safely recycle ink has become a pressing issue for printing equipment used in the production of food packaging bags. Summary of the Invention

[0004] The object of the present invention is to provide a multi-level color printing device for producing food packaging bags to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-color printing device for producing food packaging bags, comprising a printing platform and a bracket fixedly connected to the bottom of the printing platform, a printing box fixedly mounted on the top left side of the printing platform, a drying box fixedly mounted on the top right side of the printing platform, and a winding device fixedly mounted on the top leftmost side of the printing platform;

[0006] The bottom of the drying box is fixedly connected to a recovery tank, and an ink recovery device is provided inside the recovery tank. The ink recovery device includes a stirring mechanism, a flocculation mechanism and an extraction mechanism;

[0007] The stirring mechanism includes a motor, a rotating shaft, a connecting block and a dispersing plate, wherein the motor is fixedly mounted on the left middle portion of the recovery tank, the rotating shaft is connected to the output end of the motor, the connecting block is fixedly connected to the outer surface of the rotating shaft, and the dispersing plate is fixedly connected to the outer surface of the connecting block;

[0008] The flocculation mechanism includes a liquid storage box, a one-way valve, a permeation tube, a sliding plate, a fixed block and a telescopic spring. The liquid storage box is fixedly installed on the surface of the dispersion plate, the one-way valve is fixedly installed on the top of the liquid storage box, the permeation tube is fixedly connected to the side of the liquid storage box, the sliding plate is slidably connected to the inner wall of the liquid storage box, the fixed block is fixedly connected to the inner wall of the liquid storage box, and the telescopic spring is fixedly connected to the side of the fixed block.

[0009] Preferably, the connecting blocks are distributed at equal intervals on the outer surface of the rotating shaft, and the end of the rotating shaft away from the output end of the motor is connected to the interior of the recovery tank through a ball bearing and a bearing seat.

[0010] Preferably, a small hole with a diameter of 0.2 mm is opened on one side of the permeation tube outside the liquid storage box, the one-way valve only allows liquid to enter the inside from the outside of the liquid storage box, and the end of the telescopic spring away from the fixed block is fixedly connected to the sliding plate.

[0011] Preferably, the extraction mechanism includes a liquid pump, a connecting pipe, a liquid separation box and a liquid inlet pipe. The liquid pump is fixedly installed on the back of the recovery tank, the connecting pipe is connected to the output end of the liquid pump, the liquid separation box is fixedly connected to the end of the connecting pipe away from the liquid pump, and the liquid inlet pipe is fixedly connected to the end of the liquid separation box away from the connecting pipe.

[0012] Preferably, an ink storage box is fixedly installed on the top of the printing box, a mounting plate is connected to the top of one inner side of the ink storage box by bolts, a filter is fixedly connected to the surface of the mounting plate, heating tubes are fixedly installed on both sides of the inner wall of the ink storage box, a through hole is opened on the front of the ink storage box, a sliding rod is slidably connected to the inside of the through hole, a pull rod is fixedly connected to the front of the sliding rod, a connecting column is fixedly connected to the back of the sliding rod, and a spoiler is fixedly connected to the top of the connecting column.

[0013] Preferably, the end of the liquid inlet pipe away from the liquid separation box extends to the interior of the ink storage box, and the heating tube is an electric heating tube and is controlled by an external control switch.

[0014] Preferably, a mounting frame is fixedly installed on the bottom of the inner wall of the printing box, a motor is fixedly installed on the side of the mounting frame, the output end of the motor is connected to a transmission roller, the surface of the mounting frame is respectively connected to printing roller one and printing roller two through bearing seats, and an adjusting cylinder is installed on the top of the mounting frame.

[0015] Preferably, a winding roller is installed on the top left side of the drying box, and a handle is fixedly connected to the front of the winding roller, and a self-locking slide rail is fixedly installed on the left side of the drying box, and a slider is slidably connected to the surface of the self-locking slide rail, and a movable plate is fixedly connected to the side of the slider, and a cleaning brush is fixedly connected to the bottom of the movable plate, and the inner bottom of the self-locking slide rail is fixedly connected to a support column, and the top of the support column is fixedly connected to a fixed plate, and a cleaning brush is fixedly connected to the top of the fixed plate. The bottom of the fixed plate is fixedly connected to a second insulation board, and the top of the movable plate is fixedly connected to a first insulation board.

[0016] Preferably, the top of the insulation board 1 is wound around the surface of the winding roller, the top of the movable board and the bottom of the fixed board are fixedly installed with an electrostatic generator, and the surfaces of the movable board, the fixed board, the cleaning brush 1 and the cleaning brush 2 are all coated with an anti-static coating.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This multi-stage color printing device for food packaging bag production drives the liquid storage box to rotate during the rotation of the shaft. Under the action of centrifugal force, the flocculant inside the liquid storage box continuously flows. When the flocculant flows into the permeation tube, it will flow out from the small hole into the inside of the recovery tank. After the motor stops rotating, the permeated flocculant can flocculate the ink inside the recovery tank, effectively removing suspended particles, colloidal substances and some organic matter in the ink.

[0019] 2. The food packaging bag production uses a multi-level color printing device. The bottom of the food packaging bag passes through the surface of the second cleaning brush, and then the handle is turned to rotate the winding roller, and the insulation board 1 is lowered, so that the insulation board 1 drives the slider to slide on the surface of the self-locking slide rail. After the movable plate is lowered, the bottom of the first cleaning brush contacts the food packaging bag, and the dust on the surface of the food packaging bag can be removed when the food packaging bag passes by.

[0020] 3. The multi-stage color printing device for producing food packaging bags has an anti-static coating on the surfaces of the movable plate, fixed plate, cleaning brush 1 and cleaning brush 2. When powered on, additional electrons are generated. These electrons can move freely inside the coating, thereby significantly reducing the surface resistance of the coating, preventing dust accumulation, and not affecting the normal cleaning functions of cleaning brush 1 and cleaning brush 2. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the side structure of the printing box of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the drying box of the present invention;

[0025] Figure 4 for Figure 3 A schematic diagram of the structure at center A;

[0026] Figure 5 This is a schematic diagram of the internal structure of the printing box of the present invention;

[0027] Figure 6 It is a schematic diagram of the structure of the printing mechanism of the present invention;

[0028] Figure 7 It is a schematic diagram of the liquid storage box structure of the present invention;

[0029] Figure 8 Schematic diagram of the dispersion plate structure of the present invention;

[0030] Figure 9 It is a cross-sectional view of the liquid storage box of the present invention;

[0031] Figure 10 It is a schematic cross-sectional view of the liquid storage tank of the present invention;

[0032] Figure 11 Schematic diagram of the internal structure of the ink storage box of the present invention.

[0033] Figure: 1. Printing platform; 2. Bracket; 3. Drying box; 301. Winding roller; 302. Handle; 303. Self-locking slide rail; 304. Slider; 305. Movable plate; 306. Cleaning brush 1; 307. Electrostatic generator; 308. Heat shield 1; 309. Support column; 310. Fixed plate; 311. Heat shield 2; 312. Cleaning brush 2; 4. Printing box; 401. Mounting frame; 402. Motor; 403. Drive roller; 404. Printing roller 1; 405. Printing roller 2; 406. Adjusting cylinder; 5. Winding device 6. Recovery tank; 601. Motor; 602. Rotating shaft; 603. Connecting block; 604. Dispersing plate; 605. Liquid storage tank; 6051. One-way valve; 6052. Permeation tube; 6053. Sliding plate; 6054. Fixed block; 6055. Telescopic spring; 606. Liquid pump; 607. Connecting pipe; 608. Liquid separator; 609. Liquid inlet pipe; 7. Ink storage tank; 701. Filter; 702. Mounting plate; 703. Heating tube; 704. Sliding rod; 705. Pull rod; 706. Connecting column; 707. Spoiler. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] Example 1: In order to solve the problem of a large amount of reusable ink being discarded in the prior art, please refer to Figures 1-11 , the present invention provides a technical solution:

[0037] A multi-color printing device for producing food packaging bags comprises a printing platform 1 and a bracket 2 fixedly connected to the bottom of the printing platform 1. A printing box 4 is fixedly mounted on the top left side of the printing platform 1, and a drying box 3 is fixedly mounted on the top right side of the printing platform 1. Drying box 3 houses an electromagnetic heater electrically connected to an external power source. The electromagnetic heater is a JS1300 model with a rated voltage and frequency of 380V / 50Hz, a voltage adaptability range of 380V±20%, and an operating frequency of 5-40kHz. A winding device 5 is fixedly mounted on the far left side of the top of the printing platform 1. Winding device 5 rotates a winding shaft driven by a motor 2, around which printed and dried packaging bags are wound. The model of motor 2 is Y2-90L-4.

[0038] A mounting bracket 401 is fixedly mounted on the bottom of the inner wall of the printing box 4. A motor 402, model NEMA 230, is fixedly mounted on the side of the mounting bracket 401. The output end of the motor 402 is connected to a drive roller 403. The surface of the mounting bracket 401 is connected to a printing roller 1 404 and a printing roller 2 405 via bearing blocks. An adjusting cylinder 406 is mounted on the top of the mounting bracket 401. When a food packaging bag is inside the printing box 4, it first passes between the printing roller 1 404 and the drive roller 403. By starting the motor 402, the output shaft of the motor 402 drives the drive roller 403 to rotate, which allows the food packaging bag to move continuously. When there are two food packaging bags inside the printing box 4, another food packaging bag passes between the printing roller 2 405 and the drive roller 403. A winding device 5 is added to the leftmost side of the top of the printing platform 1 to rewind the other food packaging bag.

[0039] A recovery tank 6 is fixedly connected to the bottom of the drying box 3. The inner wall of the recovery tank 6 is coated with a fluoropolymer coating mainly composed of polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF). An ink recovery device is installed inside the recovery tank 6. The ink recovery device includes a stirring mechanism, a flocculation mechanism, and an extraction mechanism.

[0040] The stirring mechanism includes a motor 601, a rotating shaft 602, a connecting block 603 and a dispersion plate 604. The motor 601 is fixedly installed in the middle of the left side of the recovery tank 6, the rotating shaft 602 is connected to the output end of the motor 601, the connecting block 603 is fixedly connected to the outer surface of the rotating shaft 602, and the dispersion plate 604 is fixedly connected to the outer surface of the connecting block 603; the model of the motor 601 is Y2-90S-2.

[0041] The flocculation mechanism includes a liquid storage tank 605, a one-way valve 6051, a permeation tube 6052, a sliding plate 6053, a fixed block 6054 and a telescopic spring 6055. The liquid storage tank 605 is fixedly installed on the surface of the dispersion plate 604. The interior of the liquid storage tank 605 is filled with flocculant, which is polyaluminum chloride liquid. The one-way valve 6051 is fixedly installed on the top of the liquid storage tank 605. Flocculant can be added to the interior of the liquid storage tank 605 through the one-way valve 6051. The permeation tube 6052 is fixedly connected to the side of the liquid storage tank 605. The sliding plate 6053 is slidably connected to the inner wall of the liquid storage tank 605. The fixed block 6054 is fixedly connected to the inner wall of the liquid storage tank 605. The telescopic spring 6055 is fixedly connected to the side of the fixed block 6054.

[0042] The connecting blocks 603 are evenly spaced on the outer surface of the rotating shaft 602. The end of the rotating shaft 602 away from the output end of the motor 601 is connected to the interior of the recovery tank 6 through a ball bearing and a bearing seat. The permeation tube 6052 is located on one side outside the liquid storage tank 605 and is provided with a small hole with a diameter of 0.02 mm. The one-way valve 6051 only allows liquid to enter the interior from the outside of the liquid storage tank 605. The end of the telescopic spring 6055 away from the fixed block 6054 is fixedly connected to the sliding plate 6053.

[0043] When printing on food packaging bags, the ink on the printing roller 1 404 and the printing roller 2 405 will fall into the recovery tank 6, and the ink will slide along the inner wall of the recovery tank 6 and gather at the bottom of the recovery tank 6. At this time, by starting the motor 601, the output shaft of the motor 601 drives the rotating shaft 602 to rotate, and the rotating shaft 602 drives the dispersion plate 604 to rotate through the connecting block 603. The dispersion plate 604 disperses the ink, and the liquid storage box 605 will be driven to rotate during the rotation of the rotating shaft 602. Under the action of force, the sliding plate 6053 inside the liquid storage tank 605 will change its position, thereby loosening the telescopic spring 6055 to extend or shorten it, and then the flocculant inside the liquid storage tank 605 will continue to flow. When the flocculant flows into the permeation tube 6052, it will flow out from the small hole to the inside of the recovery tank 6. After the motor 601 stops rotating, the permeated flocculant can flocculate the ink inside the recovery tank 6, effectively removing suspended particles, colloidal substances and some organic matter in the ink.

[0044] The extraction mechanism includes a liquid pump 606, a connecting pipe 607, a liquid separation box 608 and a liquid inlet pipe 609. The liquid pump 606 is fixedly installed on the back of the recovery tank 6, the connecting pipe 607 is connected to the output end of the liquid pump 606, the liquid separation box 608 is fixedly connected to the end of the connecting pipe 607 away from the liquid pump 606, and the liquid inlet pipe 609 is fixedly connected to the end of the liquid separation box 608 away from the connecting pipe 607.

[0045] After the ink completes flocculation inside the recovery tank 6, the upper layer of ink is extracted along the connecting pipe 607 by starting the liquid extraction pump 606. After the ink enters the liquid separation box 608, it is fully distributed and enters the ink storage box 7 through the liquid inlet pipe 609, completing the recycling of the ink.

[0046] An ink storage tank 7 is fixedly installed on the top of the printing box 4. An ink inlet pipe (not shown in the figure) is connected to the other side of the ink storage tank 7. An ink supply pipe is installed at the bottom of the ink storage tank 7. The ink supply pipe is connected to the inside of the printing roller 1 404 and the printing roller 2 405, so that the surfaces of the printing roller 1 404 and the printing roller 2 405 are coated with color ink. A mounting plate 702 is connected to the top of one side of the interior of the ink storage tank 7 by bolts. A filter screen 701 is fixedly connected to the surface of the mounting plate 702. The filter screen 701 is detachable. After removing the bolts of the mounting plate 702, The filter 701 can be replaced and cleaned. Heating tubes 703 are fixedly installed on both sides of the inner wall of the ink storage box 7. A through hole is opened on the front of the ink storage box 7. A slide rod 704 is slidably connected inside the through hole. A pull rod 705 is fixedly connected to the front of the slide rod 704. A connecting column 706 is fixedly connected to the back of the slide rod 704. A spoiler 707 is fixedly connected to the top of the connecting column 706. The end of the liquid inlet pipe 609 away from the liquid separation box 608 extends to the interior of the ink storage box 7. The heating tube 703 is an electric heating tube and is controlled by an external control switch.

[0047] After the ink enters the ink storage tank 7, it is first filtered through the filter 701. Then, after the ink accumulates inside the ink storage tank 7, the heating tube 703 is started to heat the ink to prevent it from solidifying. By pushing the pull rod 705, the connecting column 706 and the spoiler 707 are driven to move, so that the ink can flow continuously, thereby preventing the ink from solidifying.

[0048] Embodiment 2: Based on embodiment 1, in order to prevent dust from adhering to the surface of the food packaging bag after drying, the present application installs a winding roller 301 on the top left side of the drying box 3, and the front of the winding roller 301 is fixedly connected to a handle 302, and the left side of the drying box 3 is fixedly installed with a self-locking slide rail 303, and the surface of the self-locking slide rail 303 is slidably connected to a slider 304, and the side of the slider 304 is fixedly connected to a movable plate 305, and the bottom of the movable plate 305 is fixedly connected to a dust cleaning brush 1 306, and the inner bottom of the self-locking slide rail 303 is fixedly connected to a support column 309, and the top of the support column 309 is fixedly connected to a fixed plate 310, and the top of the fixed plate 310 is fixedly connected to a dust cleaning brush 2 312, the bottom of the fixed plate 310 is fixedly connected to a heat insulation board 2 311, and the top of the movable plate 305 is fixedly connected to a heat insulation board 1 308.

[0049] After printing is completed, the food packaging bag enters the interior of the drying box 3 and is dried by the high temperature generated by the electromagnetic heater. When the food packaging bag is discharged from the drying box 3, the bottom of the food packaging bag passes through the surface of the cleaning brush 2 312, and then the handle 302 is rotated to rotate the winding roller 301, and the insulation board 1 308 is lowered, so that the insulation board 1 308 drives the slider 304 to slide on the surface of the self-locking slide rail 303, and after the movable plate 305 is lowered, the bottom of the cleaning brush 1 306 contacts the food packaging bag, and the dust on the surface of the food packaging bag can be removed when the food packaging bag passes by.

[0050] The top of insulation board 1 308 is wrapped around the surface of winding roller 301. Static generators 307 are fixedly mounted on the top of movable board 305 and the bottom of fixed board 310. The surfaces of movable board 305, fixed board 310, cleaning brush 1 306, and cleaning brush 2 312 are all coated with an antistatic coating. Insulation board 1 308 and insulation board 2 311 are made of ceramic fiber.

[0051] The antistatic coating is ATO, an n-type semiconductor material with excellent conductivity and chemical stability. ATO is evenly dispersed in an organic or inorganic binder and applied to the surfaces of the movable plate 305, fixed plate 310, cleaning brush 1 306, and cleaning brush 2 312 to form a coating. The antimony (Sb) atoms in the ATO partially replace the tin (Sn) atoms in the tin dioxide (SnO2) lattice. When energized, this generates additional electrons, which can move freely within the coating, significantly reducing the surface resistance of the coating and preventing static electricity from accumulating on the surfaces of the movable plate 305, fixed plate 310, cleaning brush 1 306, and cleaning brush 2 312. The ATO coating has high transmittance for visible light and does not affect the cleaning function of cleaning brush 1 306 and cleaning brush 2 312. Furthermore, it maintains stable antistatic properties even under harsh conditions such as high temperature and high humidity.

[0052] Working principle: When printing food packaging bags, the packaging bags are first passed into the printing box 4 and the drying box 3 in sequence. After coming out of the drying box 3, they are wound on the winding device 5. The motor 2 on the winding device 5 is started to drive the winding shaft to rotate, so that the food packaging bags are continuously moved. The food packaging bags are painted after passing through the printing roller 1 404 and the printing roller 2 405. Then, after the food packaging bags enter the drying box 3, they are dried and the ink and pigment are dried. After coming out of the drying box 3, they are wound on the winding device 5, and the printing on the food packaging bags is completed.

[0053] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0054] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A multi-color printing device for producing food packaging bags, comprising a printing platform (1) and a bracket (2) fixedly connected to the bottom of the printing platform (1), characterized in that: A printing box (4) is fixedly installed on the left side of the top of the printing platform (1), a drying box (3) is fixedly installed on the right side of the top of the printing platform (1), and a winding device (5) is fixedly installed on the leftmost side of the top of the printing platform (1); The bottom of the drying box (3) is fixedly connected to a recovery tank (6), and an ink recovery device is provided inside the recovery tank (6), and the ink recovery device includes a stirring mechanism, a flocculation mechanism and an extraction mechanism; The stirring mechanism comprises a motor (601), a rotating shaft (602), a connecting block (603) and a dispersing plate (604); the motor (601) is fixedly mounted on the middle portion of the left side of the recovery tank (6); the rotating shaft (602) is connected to the output end of the motor (601); the connecting block (603) is fixedly connected to the outer surface of the rotating shaft (602); and the dispersing plate (604) is fixedly connected to the outer surface of the connecting block (603); The flocculation mechanism comprises a liquid storage box (605), a one-way valve (6051), a permeation tube (6052), a sliding plate (6053), a fixed block (6054) and a telescopic spring (6055), wherein the liquid storage box (605) is fixedly mounted on the surface of the dispersion plate (604), the one-way valve (6051) is fixedly mounted on the top of the liquid storage box (605), the permeation tube (6052) is fixedly connected to the side of the liquid storage box (605), the sliding plate (6053) is slidably connected to the inner wall of the liquid storage box (605), the fixed block (6054) is fixedly connected to the inner wall of the liquid storage box (605), and the telescopic spring (6055) is fixedly connected to the side of the fixed block (6054).

2. The multi-level color printing device for producing food packaging bags according to claim 1, characterized in that: The connecting blocks (603) are distributed at equal intervals on the outer surface of the rotating shaft (602), and one end of the rotating shaft (602) away from the output end of the motor (601) is connected to the interior of the recovery tank (6) via a ball bearing and a bearing seat.

3. The multi-level color printing device for producing food packaging bags according to claim 1, characterized in that: The permeation tube (6052) is provided with a small hole with a diameter of 0.02 mm on one side outside the liquid storage box (605). The one-way valve (6051) only allows liquid to enter the interior of the liquid storage box (605) from the outside. The end of the telescopic spring (6055) away from the fixed block (6054) is fixedly connected to the sliding plate (6053).

4. The multi-level color printing device for producing food packaging bags according to claim 1, characterized in that: The extraction mechanism comprises a liquid extraction pump (606), a connecting pipe (607), a liquid separation box (608) and a liquid inlet pipe (609), wherein the liquid extraction pump (606) is fixedly mounted on the back of the recovery tank (6), the connecting pipe (607) is connected to the output end of the liquid extraction pump (606), the liquid separation box (608) is fixedly connected to one end of the connecting pipe (607) away from the liquid extraction pump (606), and the liquid inlet pipe (609) is fixedly connected to one end of the liquid separation box (608) away from the connecting pipe (607).

5. The multi-level color printing device for producing food packaging bags according to claim 4, characterized in that: An ink storage box (7) is fixedly installed on the top of the printing box (4), a mounting plate (702) is connected to the top of one side of the interior of the ink storage box (7) by bolts, a filter (701) is fixedly connected to the surface of the mounting plate (702), heating tubes (703) are fixedly installed on both sides of the inner wall of the ink storage box (7), a through hole is opened on the front of the ink storage box (7), a sliding rod (704) is slidably connected to the inside of the through hole, a pull rod (705) is fixedly connected to the front of the sliding rod (704), a connecting column (706) is fixedly connected to the back of the sliding rod (704), and a spoiler (707) is fixedly connected to the top of the connecting column (706).

6. The multi-level color printing device for producing food packaging bags according to claim 5, characterized in that: One end of the liquid inlet pipe (609) away from the liquid separation box (608) extends to the interior of the ink storage box (7); the heating pipe (703) is an electric heating pipe and is controlled by an external control switch.

7. The multi-level color printing device for producing food packaging bags according to claim 1, characterized in that: A mounting frame (401) is fixedly mounted on the bottom of the inner wall of the printing box (4), a motor (402) is fixedly mounted on the side of the mounting frame (401), an output end of the motor (402) is connected to a transmission roller (403), a surface of the mounting frame (401) is respectively connected to a printing roller 1 (404) and a printing roller 2 (405) via a bearing seat, and an adjusting cylinder (406) is mounted on the top of the mounting frame (401).

8. The multi-color printing device for producing food packaging bags according to claim 1, characterized in that: A winding roller (301) is installed on the top left side of the drying box (3), and a handle (302) is fixedly connected to the front of the winding roller (301). A self-locking slide rail (303) is fixedly installed on the left side of the drying box (3), and a slider (304) is slidably connected to the surface of the self-locking slide rail (303). The side of the slider (304) is fixedly connected to a movable plate (305), and the bottom of the movable plate (305) is fixedly connected to a cleaning brush (306). The inner bottom of the self-locking slide rail (303) is fixedly connected to a support column (309), and the top of the support column (309) is fixedly connected to a fixed plate (310). The top of the fixed plate (310) is fixedly connected to a second cleaning brush (312). The bottom of the fixed plate (310) is fixedly connected to a second insulation board (311), and the top of the movable plate (305) is fixedly connected to a first insulation board (308).

9. The multi-level color printing device for producing food packaging bags according to claim 8, characterized in that: The top of the heat insulation plate 1 (308) is wound around the surface of the winding roller (301), the top of the movable plate (305) and the bottom of the fixed plate (310) are fixedly installed with an electrostatic generator (307), and the surfaces of the movable plate (305), the fixed plate (310), the cleaning brush 1 (306) and the cleaning brush 2 (312) are all coated with an antistatic coating.

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