Paper packaging box intaglio printing equipment and process thereof

Abstract

The invention relates to the technical field of intaglio printing, in particular to paper packaging box intaglio printing equipment and a technology thereof. A paper packaging box intaglio printing device comprises a printing roller and a pressing roller, the axial direction of the printing roller is consistent with the axial direction of the pressing roller, a distance for a paperboard to pass through exists between the printing roller and the pressing roller in the radial direction of the printing roller, the printing roller is arranged in the axial direction of the printing roller in a rotating mode, and the pressing roller is arranged in the axial direction of the pressing roller in a rotating mode. The rotating directions of the printing roller and the pressing roller are opposite, the ink jetting structure is used for supplementing ink to the printing roller, the ink scraping structure is used for scraping redundant ink on the printing roller, and the ink receiving structure is used for receiving the ink on the printing roller. The ink receiving structure is located below the printing roller and used for receiving ink dripping from the printing roller. The ink supply device has the following effects that the probability that redundant ink drips onto equipment and the ground is reduced, resource waste is reduced, and environmental pollution and printing quality are improved.

Description

Technical Field

[0001] The present application relates to the technical field of gravure printing equipment for paper packaging boxes, and in particular to a gravure printing equipment for paper packaging boxes and a process thereof. Background Art

[0002] Gravure printing is a technology widely used in the field of high-quality printing, especially suitable for printing paper packaging boxes. Gravure printing equipment for paper packaging boxes is widely used in industries such as food, medicine and cosmetics. Its main function is to accurately print preset patterns on the surface of paper packaging boxes. This equipment can achieve efficient and high-quality printing operations to meet the personalized needs of different customers.

[0003] As the market's requirements for product quality continue to increase, gravure printing equipment is also constantly improving and developing to improve production efficiency and printing quality. At present, in the gravure printing process of paper packaging boxes, common technical means include the use of traditional drum printing machines and inkjet printing machines. Among them, drum printing machines usually consist of a pair of printing rollers and pressure rollers that cooperate with each other, and printing is completed by ink transfer. Specifically, after the ink is coated on the printing roller, the pressure between the printing roller and the pressure roller causes the ink to be transferred to the paper surface.

[0004] Usually, excess ink will adhere to the printing roller and may drip onto the equipment and the ground, which not only leads to waste of resources and environmental pollution, but also affects the printing quality and increases production costs. Summary of the invention

[0005] In order to reduce the probability of excess ink dripping onto the equipment and the ground, reduce the waste of resources, improve environmental pollution problems, improve printing quality, and reduce production costs, the present application provides a paper packaging box gravure printing device.

[0006] The present application provides a gravure printing device for a paper packaging box, which adopts the following technical scheme: it includes a printing roller and a pressing roller, wherein the axis of the printing roller is consistent with the axis of the pressing roller, and there is a distance between the printing roller and the pressing roller along the radial direction of the printing roller for paperboard to pass through, the printing roller is arranged to rotate along the axis of the printing roller, and the pressing roller is arranged to rotate along the axis of the pressing roller, and the printing roller and the pressing roller rotate in opposite directions, and also includes an inkjet structure, an ink scraping structure and an ink receiving structure, wherein the inkjet structure is used to replenish ink to the printing roller, the ink scraping structure is used to scrape off excess ink on the printing roller, and the ink receiving structure is located below the printing roller and is used to receive ink dripped from the printing roller.

[0007] By adopting the above technical solution, after the inkjet structure replenishes ink to the printing roller, there will be excess ink on the printing roller. The excess ink on the printing roller will be scraped off by the ink scraping structure, and the ink receiving structure will receive the scraped excess ink, thereby reducing the probability of excess ink dripping onto the equipment and the ground, reducing the waste of resources, improving environmental pollution problems, improving printing quality, and reducing production costs.

[0008] Preferably, the ink scraping structure comprises an ink scraping plate and an adjusting member, one end of the ink scraping plate is used to abut against the roller wall of the printing roller, and the other end of the ink scraping plate is used to be connected to the adjusting member, and the adjusting member is used to adjust the position of the ink scraping plate.

[0009] By adopting the above technical solution, since different paper packaging boxes have different thicknesses, the adjusting member can adjust the position of the ink scraper according to the thickness of the paper packaging box.

[0010] Preferably, the scraper plate is arranged at an angle, and the adjusting member is used to drive the scraper plate to slide back and forth in a positionable manner perpendicular to the length direction of the scraper plate, and the adjusting member is used to drive the scraper plate to slide back and forth in a positionable manner along the inclination direction of the scraper plate towards or away from the printing roller.

[0011] By adopting the above technical solution, the setting of the plate is adjusted to realize the up and down movement and front and back tilt adjustment of the ink scraping plate, which can not only accurately control the ink scraping force, but also adapt to paper packaging boxes of different thicknesses.

[0012] Preferably, a scraping arc plate is provided at one end of the scraper plate close to the printing roller, the length direction of the scraper arc plate is parallel to the length direction of the scraper plate, the concave arc surface of the scraper arc plate faces the ink receiving structure, and the end of the scraper arc plate away from the scraper plate abuts against the printing roller.

[0013] By adopting the above technical solution, the design of the ink scraping arc plate can better fit the surface of the printing roller, thereby improving the uniformity and cleanliness of ink scraping.

[0014] Preferably, the scraper plate and the scraper arc plate are provided with an adjusting shaft and a bearing seat, the adjusting shaft is connected to the scraper arc plate, the bearing seat is connected to the bearing seat, the length direction of the adjusting shaft and the length direction of the bearing seat are parallel to the length direction of the scraper plate, the bearing seat is sleeved on the adjusting shaft, an elastic member is sleeved on the adjusting shaft, one end of the elastic member is connected to the adjusting shaft, and the other end of the elastic member is connected to the bearing seat, and the bearing seat is sleeved on the elastic member.

[0015] By adopting the above technical solution, the ink scraping plate and the ink scraping arc plate are rotationally connected and the elastic member is arranged, so that the ink scraping arc plate maintains a tight force against the printing roller, ensuring the ink scraping structure's effect of scraping away excess ink on the printing roller.

[0016] Preferably, the inkjet structure comprises an inkjet head and an ink supply box, the ink supply box is used to provide ink to the inkjet head, a plurality of grooves are provided on the printing roller, the bottom shape of the grooves is a printing pattern, and the inkjet head is used to spray ink into the grooves.

[0017] By adopting the above technical solution, the ink supply box provides ink to the inkjet head, and the inkjet head sprays the ink into the groove of the printing roller to complete the inkjet work.

[0018] Preferably, the ink receiving structure includes an ink receiving box, which is used to receive ink dripping from the printing roller. The ink receiving box is connected to an ink tube, and one end of the ink tube away from the ink receiving box is connected to the inkjet head. The ink receiving box is connected to a pump, and the pump is used to pump the ink in the ink receiving box into the inkjet head.

[0019] By adopting the above technical solution, through the effective recycling of the ink receiving structure, resources are saved and environmental pollution is reduced. The overall design realizes efficient and high-quality printing operations and significantly improves the performance and reliability of the printing equipment.

[0020] Preferably, a driving member is arranged above the printing roller, and the driving member is used to drive the pressing roller to slide back and forth positionably along the radial direction of the pressing roller to approach or move away from the printing roller.

[0021] By adopting the above technical solution, the driving component controls the pressure applied by the pressure roller to the printing roller, thereby realizing dynamic adjustment of the printing pressure, which helps to maintain a stable printing effect on paperboards of different materials and thicknesses.

[0022] Preferably, it also includes a shooting component and a drying component, the printing roller, the shooting component and the drying component are arranged in sequence and at intervals, the shooting component is used to shoot and detect the printed pattern on the paper packaging box, and the drying component is used to dry the printed pattern on the paper packaging box.

[0023] By adopting the above technical solution, the shooting component is used to capture the image of the printed paper packaging box and determine whether the pattern quality on the paper packaging box meets the standards. The paper packaging boxes with the pattern quality meeting the standards are transported to the drying component for drying.

[0024] The present application also provides a gravure printing process for a paper packaging box.

[0025] A paper packaging box gravure printing process is implemented by using the above-mentioned paper packaging box gravure printing equipment. The following steps are involved: S1, paper feeding: conveying the paper packaging box to between the printing roller and the pressing roller through the paper feeding roller; S2, inkjet: the ink supply box supplies ink to the inkjet head, and the inkjet head sprays the ink into the groove of the printing roller; S3, ink scraping: the ink scraping arc plate contacts the printing roller to scrape off the excess ink on the printing roller, and the ink receiving box receives the excess ink; S4, printing and discharging paper: the pressing roller approaches the printing roller pair to print the pattern on the paper packaging box, and the paper packaging box after printing is output to the next process through the paper discharging roller; S5. Detection: Detect the pattern on the printed paper packaging box; S6, drying: drying the qualified printed paper packaging box through the drying structure.

[0026] By adopting the above technical solution, the probability of excess ink dripping onto equipment and the ground can be reduced, the waste of resources can be reduced, environmental pollution problems can be improved, printing quality can be improved, and production costs can be reduced.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. Reduce the probability of excess ink dripping onto equipment and the ground, reduce waste of resources, improve environmental pollution, improve printing quality, and reduce production costs; 2. Adjust the setting of the plate to achieve the up and down movement and front and back tilt adjustment of the ink scraper, which can not only accurately control the ink scraping force, but also adapt to paper packaging boxes of different thicknesses; 3. Through the effective recycling of the ink receiving structure, resources are saved and environmental pollution is reduced. The overall design realizes efficient and high-quality printing operations and significantly improves the performance and reliability of printing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of a paper packaging box gravure printing device in this application; Figure 2 It is a schematic diagram of a partial structure of a paper packaging box gravure printing device in the present application; Figure 3 It is a cross-sectional schematic diagram of a partial structure of a paper packaging box gravure printing device in the present application; Figure 4 It is a schematic diagram of a partial structure of a paper packaging box gravure printing device in the present application; Figure 5 It is a cross-sectional schematic diagram of a partial structure of a paper packaging box gravure printing device in the present application; Figure 6This is a schematic diagram of the process flow of a paper packaging box gravure printing process in this application.

[0029] Description of reference numerals: 110, printing roller; 111, pressing roller; 112, groove; 113, paper inlet; 114, paper outlet; 115, paper inlet roller; 116, paper outlet roller; 117, driving member; 118, mounting frame; 119, mounting plate; 120, inkjet structure; 121, inkjet head; 122, ink supply box; 130, ink scraping structure; 131, ink scraping plate; 132, adjusting member; 1321, adjusting slider; 132 2. Adjusting screw; 1323. Screw motor; 1324. Adjusting cylinder; 133. Ink scraping arc plate; 134. Adjusting shaft; 135. Bearing seat; 136. Elastic part; 140. Ink cartridge; 141. Ink tube; 142. Pump; 150. Printing work box; 151. Sliding track; 160. High-speed camera; 170. Support mounting frame; 171. Drying box; 172. Drying cylinder; 173. Hot air dryer. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with the accompanying drawings.

[0031] The present application discloses a gravure printing device for paper packaging boxes, which is used to reduce the probability of excess ink dripping onto the device and the ground, reduce waste of resources, improve environmental pollution problems, improve printing quality, and reduce production costs.

[0032] refer to Figure 1-Figure 5 A paper packaging box gravure printing device includes a printing roller 110 and a pressing roller 111. The axial direction of the printing roller 110 is consistent with the axial direction of the pressing roller 111. There is a distance between the printing roller 110 and the pressing roller 111 along the radial direction of the printing roller 110 for paperboard to pass through. The printing roller 110 is arranged to rotate along the axial direction of the printing roller 110, and the pressing roller 111 is arranged to rotate along the axial direction of the pressing roller 111. The printing roller 110 and the pressing roller 111 rotate in opposite directions. In this embodiment, a printing working box 150 is also included. The two opposite side box walls of the printing working box 150 are respectively penetrated with a paper feed port 1 13 and a paper outlet 114, and a paper feed roller 115 and a paper outlet roller 116 are arranged on two opposite side box walls of the printing working box 150, two paper feed rollers 115 are arranged, the axial direction of the paper feed roller 115 is parallel to the axial direction of the printing roller 110, and the radial distance between the two paper feed rollers 115 along the paper feed roller 115 can be adjusted to be suitable for paper packaging boxes of different thicknesses. Similarly, two paper outlet rollers 116 are arranged, the axial direction of the paper outlet roller 116 is parallel to the axial direction of the printing roller 110, and the radial distance between the two paper outlet rollers 116 along the paper feed roller 115 can be adjusted.

[0033] The printing roller 110 and the pressing roller 111 are both arranged in the printing work box 150. A driving member 117 is arranged above the printing roller 110. The driving member 117 is used to drive the pressing roller 111 to slide back and forth in a radial direction of the pressing roller 111 so as to be positioned close to or away from the printing roller 110. The driving member 117 is a driving cylinder. The driving cylinder is vertically penetrated through the top of the printing work box 150. The driving cylinder drives the printing roller 110 to slide back and forth in a vertical direction so as to be positioned. The driving cylinder can control the pressure applied by the pressing roller 111 to the printing roller 110, thereby realizing dynamic adjustment of the printing pressure, which is helpful to maintain a stable printing effect on paperboards of different materials and thicknesses, thereby obtaining a better printing effect.

[0034] Specifically, a mounting frame 118 is provided in the printing work box 150, and the piston rod of the driving cylinder is connected to the top of the mounting frame 118. A mounting plate 119 is symmetrically extended in the vertical direction on the side of the mounting frame 118 away from the driving cylinder. The two ends of the pressure roller 111 are respectively rotatably connected to the two mounting plates 119. The driving cylinder drives the mounting frame 118 and the pressure roller 111 to slide back and forth in the vertical direction at the same time.

[0035] In addition, the device also includes an inkjet structure 120, an ink scraper structure 130 and an ink receiving structure. The inkjet structure 120 is used to replenish ink to the printing roller 110, and the ink scraper structure 130 is used to scrape off excess ink on the printing roller 110. The ink receiving structure is located below the printing roller 110 and is used to receive ink dripping from the printing roller 110. After the inkjet structure 120 replenishes ink to the printing roller 110, there will be excess ink on the printing roller 110. The excess ink on the printing roller 110 is scraped off by the ink scraper structure 130, and the ink receiving structure will receive the scraped excess ink. Such a design can reduce the probability of excess ink dripping onto the equipment and the ground, reduce waste of resources, improve environmental pollution problems, improve printing quality, reduce production costs, and improve printing quality and production efficiency.

[0036] Specifically, the inkjet structure 120 includes an inkjet head 121 and an ink supply cartridge 122. The ink supply cartridge 122 is used to provide ink to the inkjet head 121. A plurality of grooves 112 are provided on the printing roller 110. The bottom shape of the grooves 112 is a printing pattern. The inkjet head 121 is used to spray ink into the grooves 112. The inkjet head 121 can use a high-precision nozzle to ensure that the ink enters the predetermined grooves 112 accurately. The ink supply cartridge 122 can use a large-capacity ink storage tank to reduce the trouble of frequent replacement. In other embodiments, the ink amount can be monitored in real time by a pressure sensor to replenish the ink.

[0037] Furthermore, the scraper structure 130 includes a scraper plate 131 and an adjusting member 132. One end of the scraper plate 131 is used to contact the roller wall of the printing roller 110, and the other end of the scraper plate 131 is used to be connected to the adjusting member 132. Since the thicknesses of different paper packaging boxes are different, the adjusting member 132 can adjust the position of the scraper plate 131 according to the thickness of the paper packaging box. The adjusting member 132 is used to drive the scraper plate 131 to slide back and forth in a direction perpendicular to the length of the scraper plate 131 and the adjusting member 132 is used to drive the scraper plate 131 to slide back and forth in a direction perpendicular to the length of the scraper plate 131 and to move closer to or away from the printing roller 110 in a direction of inclination of the scraper plate 131.

[0038] Specifically, a sliding track 151 is penetrated on one side of the printing work box 150, and the length direction of the sliding track 151 is opened in the vertical direction. The adjusting member 132 includes an adjusting slider 1321, an adjusting screw rod 1322 and a screw motor 1323. The adjusting slider 1321 is embedded in the sliding track 151, and the adjusting screw rod 1322 is penetrated in the adjusting slider 1321 in the vertical direction. The screw motor 1323 is embedded in the wall of the printing work box 150, and the screw motor 1323 is located on the sliding track 15 1, one end of the adjusting screw rod 1322 is coaxially connected to the output shaft of the screw motor 1323, and the other end of the adjusting screw rod 1322 is connected to the sliding track 151 for circumferential rotation and axial fixation. The adjusting member 132 also includes an adjusting cylinder 1324. The ink scraping plate 131 and the adjusting cylinder 1324 are both tilted. The adjusting cylinder 1324 is tilted and penetrates the adjusting slider 1321. The ink scraping plate 131 is connected to the piston rod of the adjusting cylinder 1324 to achieve the up and down movement and forward and backward tilt adjustment of the ink scraping plate 131. In this way, not only can the ink scraping force be accurately controlled, but also it can adapt to cardboards of different thicknesses.

[0039] An ink scraping arc plate 133 is provided at one end of the ink scraping plate 131 close to the printing roller 110, the length direction of the ink scraping arc plate 133 is parallel to the length direction of the ink scraping plate 131, the concave arc surface of the ink scraping arc plate 133 faces the ink receiving structure, and the end of the ink scraping arc plate 133 away from the ink scraping plate 131 is in contact with the printing roller 110. The design of the ink scraping arc plate 133 can better fit the surface of the printing roller 110, thereby improving the uniformity and cleanliness of the ink scraping; in addition, the ink scraping plate 131 and the ink scraping arc plate 133 are provided with an adjusting shaft 134 and a bearing seat 135, the adjusting shaft 134 is connected to the ink scraping arc plate 133, and the bearing seat 135 is connected to the bearing seat 135, The length direction of the adjusting shaft 134 and the length direction of the bearing seat 135 are both parallel to the length direction of the scraper plate 131. The bearing seat 135 is sleeved on the adjusting shaft 134. An elastic member 136 is sleeved on the adjusting shaft 134. One end of the elastic member 136 is connected to the adjusting shaft 134, and the other end of the elastic member 136 is connected to the bearing seat 135. The bearing seat 135 is sleeved on the elastic member 136. The scraper plate 131 and the scraper arc plate 133 are rotationally connected and the elastic member 136 is provided, so that the scraper arc plate 133 maintains a tight force on the printing roller 110, thereby ensuring the scraping effect of the scraper structure 130 on the excess ink on the printing roller 110.

[0040] Furthermore, the ink receiving structure includes an ink receiving box 140, which is used to receive ink dripping from the printing roller 110. The ink receiving box 140 is connected to an ink tube 141, and the end of the ink tube 141 away from the ink receiving box 140 is connected to the inkjet head 121. The ink receiving box 140 is connected to a pump 142, and the pump 142 is used to pump the ink in the ink receiving box 140 into the inkjet head 121. The design of the ink receiving box 140 can effectively collect scattered ink, save resources, and reduce environmental pollution. The overall design realizes efficient and high-quality printing operations, and significantly improves the performance and reliability of the printing equipment.

[0041] In addition, the device also includes a shooting component and a drying component. The printing roller 110, the shooting component and the drying component are arranged in sequence at intervals. The shooting component is used to shoot and detect the printed pattern on the paper packaging box, and the drying component is used to dry the printed pattern on the paper packaging box. The shooting component is used to capture the image of the paper packaging box after printing and determine whether the quality of the pattern on the paper packaging box meets the standards. The paper packaging boxes with pattern quality that meets the standards are transported to the drying component for drying.

[0042] Specifically, the shooting component includes a high-speed camera 160 and an image processor. The high-speed camera 160 is installed downstream of the printing roller 110 to capture the image on the printed paper packaging box. The image processor performs real-time analysis on the captured image to determine whether the quality of the printed pattern meets the standard, which can greatly improve the degree of automation of printing and product quality; the drying component can be a set of hot air dryers 173, which are installed after the shooting component to quickly evaporate the solvent in the ink on the paper packaging box that has just been printed. The hot air dryer 173 can adjust the temperature and wind speed according to the thickness of the cardboard and the type of ink to ensure the best drying effect. In this embodiment, a support mounting frame 170 is provided on the side of the printing work box 150 where the paper outlet 114 is opened. The shooting component and the drying component are arranged on the support mounting frame 170 at intervals. A drying box 171 is arranged on the support mounting frame 170. A group of hot air dryers 173 includes two hot air dryers 173. The two hot air dryers 173 are arranged in the drying box 171 at intervals along the vertical direction, and two drying cylinders 172 are arranged in the drying box 171. The two drying cylinders 172 correspond to the two hot air dryers 173 one by one. The two drying cylinders 172 are respectively penetrated at the bottom and the top of the drying box 171 to drive the two hot air dryers 173 away from or close to each other.

[0043] The implementation principle of the gravure printing equipment for a paper packaging box in an embodiment of the present application is as follows: after the inkjet structure 120 replenishes ink to the printing roller 110, there will be excess ink on the printing roller 110. The excess ink on the printing roller 110 is scraped off by the ink scraping structure 130, and the ink receiving structure will receive the scraped excess ink, thereby reducing the probability of excess ink dripping onto the equipment and the ground, reducing waste of resources, improving environmental pollution problems, improving printing quality, and reducing production costs.

[0044] In addition, reference Figure 6 , the application also discloses a gravure printing process for a paper packaging box.

[0045] A paper packaging box gravure printing process is implemented by using the above-mentioned paper packaging box gravure printing equipment. The following steps are involved: S1, paper feeding: conveying the paper packaging box to between the printing roller 110 and the pressing roller 111 through the paper feeding roller 115; S2, inkjet: the ink supply box 122 supplies ink to the inkjet head 121, and the inkjet head 121 sprays the ink into the groove 112 of the printing roller 110; S3, ink scraping: the ink scraping arc plate 133 contacts the printing roller 110 to scrape off the excess ink on the printing roller 110, and the ink receiving box 140 receives the excess ink; S4, printing and discharging paper: the pressing roller 111 is close to the printing roller 110 to print the pattern on the paper packaging box, and the paper packaging box after printing is output to the next process through the paper discharging roller 116; S5. Detection: Detect the pattern on the printed paper packaging box; S6, drying: drying the qualified printed paper packaging box through the drying structure.

[0046] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A paper packaging box gravure printing device, comprising a printing roller (110) and a pressing roller (111), wherein the axial direction of the printing roller (110) is consistent with the axial direction of the pressing roller (111), and there is a distance between the printing roller (110) and the pressing roller (111) along the radial direction of the printing roller (110) for paperboard to pass through, the printing roller (110) is rotatably arranged along the axial direction of the printing roller (110), and the pressing roller (111) is rotatably arranged along the axial direction of the pressing roller (111), and the printing roller (110) and the pressing roller (111) rotate in opposite directions, characterized in that: It also comprises an inkjet structure (120), an ink scraping structure (130) and an ink receiving structure, wherein the inkjet structure (120) is used to replenish ink to the printing roller (110), the ink scraping structure (130) is used to scrape off excess ink on the printing roller (110), and the ink receiving structure is located below the printing roller (110) and is used to receive ink dripping from the printing roller (110).

2. The gravure printing device for paper packaging boxes according to claim 1, characterized in that: The ink scraping structure (130) comprises an ink scraping plate (131) and an adjusting member (132); one end of the ink scraping plate (131) is used to abut against a roller wall of the printing roller (110); the other end of the ink scraping plate (131) is used to be connected to the adjusting member (132); and the adjusting member (132) is used to adjust the position of the ink scraping plate (131).

3. The gravure printing device for paper packaging boxes according to claim 2, characterized in that: The ink scraper (131) is arranged at an angle, and the adjusting member (132) is used to drive the ink scraper (131) to slide back and forth in a positionable manner perpendicular to the length direction of the ink scraper (131), and the adjusting member (132) is used to drive the ink scraper (131) to slide back and forth in a positionable manner along the tilt direction of the ink scraper (131) to approach or move away from the printing roller (110).

4. The gravure printing device for paper packaging boxes according to claim 3, characterized in that: An ink scraping arc plate (133) is provided at one end of the ink scraping plate (131) close to the printing roller (110); the length direction of the ink scraping arc plate (133) is parallel to the length direction of the ink scraping plate (131); the concave arc surface of the ink scraping arc plate (133) faces the ink receiving structure; and the end of the ink scraping arc plate (133) away from the ink scraping plate (131) abuts against the printing roller (110).

5. The gravure printing device for paper packaging boxes according to claim 4, characterized in that: The ink scraping plate (131) and the ink scraping arc plate (133) are provided with an adjusting shaft (134) and a bearing seat (135); the adjusting shaft (134) is connected to the ink scraping arc plate (133); the bearing seat (135) is connected to the bearing seat (135); the length direction of the adjusting shaft (134) and the length direction of the bearing seat (135) are both parallel to the length direction of the ink scraping plate (131); the bearing seat (135) is sleeved on the adjusting shaft (134); an elastic member (136) is sleeved on the adjusting shaft (134); one end of the elastic member (136) is connected to the adjusting shaft (134); the other end of the elastic member (136) is connected to the bearing seat (135); the bearing seat (135) is sleeved on the elastic member (136).

6. The gravure printing device for paper packaging boxes according to claim 1, characterized in that: The inkjet structure (120) comprises an inkjet head (121) and an ink supply box (122), wherein the ink supply box (122) is used to provide ink to the inkjet head (121), a plurality of grooves (112) are provided on the printing roller (110), the bottom of the grooves (112) are in the shape of a printing pattern, and the inkjet head (121) is used to spray ink into the grooves (112).

7. The gravure printing device for paper packaging boxes according to claim 6, characterized in that: The ink receiving structure comprises an ink receiving box (140), wherein the ink receiving box (140) is used to receive ink dripping from the printing roller (110); the ink receiving box (140) is connected to an ink tube (141); an end of the ink tube (141) away from the ink receiving box (140) is connected to the inkjet head (121); the ink receiving box (140) is connected to a pump (142), and the pump (142) is used to pump the ink in the ink receiving box (140) into the inkjet head (121).

8. The gravure printing device for paper packaging boxes according to claim 1, characterized in that: A driving member (117) is arranged above the printing roller (110), and the driving member (117) is used to drive the pressing roller (111) to slide back and forth in a positionable manner along the radial direction of the pressing roller (111) to approach or move away from the printing roller (110).

9. The gravure printing device for paper packaging boxes according to claim 1, characterized in that: It also comprises a shooting component and a drying component, wherein the printing roller (110), the shooting component and the drying component are arranged in sequence and at intervals, the shooting component is used for shooting and detecting the printed pattern on the paper packaging box, and the drying component is used for drying the printed pattern on the paper packaging box.

10. A gravure printing process for a paper packaging box, characterized in that: The gravure printing device for paper packaging boxes according to any one of claims 1 to 9 is used to achieve: The following steps are involved: S1, paper feeding: conveying the paper packaging box to between the printing roller (110) and the pressing roller (111) via the paper feeding roller (115); S2, inkjet: the ink supply box (122) supplies ink to the inkjet head (121), and the inkjet head (121) sprays the ink into the groove (112) of the printing roller (110); S3, ink scraping: the ink scraping arc plate (133) contacts the printing roller (110) to scrape off excess ink on the printing roller (110), and the ink receiving box (140) receives the excess ink; S4, printing and discharging paper: the pressing roller (111) is close to the printing roller (110) to print the pattern on the paper packaging box, and the paper packaging box after printing is output to the next process through the paper discharging roller (116); S5. Detection: Detect the pattern on the printed paper packaging box; S6, drying: drying the qualified printed paper packaging box through the drying structure.

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