Monitoring device for intelligently correcting printed pattern on surface of cup bag

Abstract

The invention belongs to the technical field of intelligent correction of cup bag surface printed patterns, and discloses a monitoring device for intelligent correction of cup bag surface printed patterns, comprising a first shell and a second shell which are mounted on the ground and are symmetrically distributed, the first shell is located behind the second shell, and the second shell is located behind the first shell; the left side surface of the first shell and the left side surface of the second shell are each fixedly provided with a guide frame, and guide shafts of the guide frames are used for guiding cup bag films blown in the film blowing process of the film blowing machine to the next process. And if the actually printed pattern is incomplete, the compensation device automatically adjusts the pressure and performs reprinting, so that human intervention is reduced, the production efficiency and continuity are improved, the incomplete pattern is rapidly corrected by a real-time feedback mechanism, the rejection rate and the production fluctuation are reduced, and the product quality is improved. And the product quality and the market competitiveness are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of film blowing machine printing, and in particular is a monitoring device for intelligently correcting printed patterns on the surface of cup bags. Background Art

[0002] As a product widely used in the packaging field, especially in the food and beverage industry, cup bags have the main function of protecting the contents and providing convenient carrying and use. The production process of cup bags includes several important steps, among which printing is a key link, which is used to print patterns, brand logos and other information on the surface of cup bags to facilitate product marketing and consumer identification.

[0003] The film blowing machine is one of the core equipment in the production of cup bags. It uses blow molding technology to process plastic raw materials into films, which are then used to make cup bags. In order to ensure that the appearance of the cup bags meets the design requirements and has good market competitiveness, the performance and precision of the printing device are particularly important. In the production process of cup bags, the printing device needs to complete high-quality pattern printing on the film, which usually includes the use of gravure printing technology to transfer ink to the film surface through a plate roller. Sometimes, in order to enhance the uniqueness and visual appeal of the cup bag's appearance, multiple printing processes are designed to use different ink layers on the film surface to achieve rich color effects and complex pattern details.

[0004] However, when the printing device of the existing film blowing machine uses gravure printing technology to print cup bag film, unexpected blank areas or pattern missing often occur, which makes the final printed pattern inconsistent with the expected design. These problems are mainly due to the lack of real-time monitoring and automatic adjustment capabilities of the device, resulting in the inability to identify and correct printing defects in a timely manner. Although manual inspection can detect problems, additional manual intervention is still required to adjust equipment parameters or reprint, thereby increasing production costs and time. Summary of the invention

[0005] In order to solve the problems raised in the above-mentioned background technology, the present invention provides a monitoring device for intelligent correction of the printed pattern on the surface of a cup bag. In the process of printing the pattern on the surface of a cup bag film blown by a film blowing machine, through a real-time detection and compensation mechanism, the printing device can timely detect and correct printing defects, thereby ensuring that the pattern of the final product is highly consistent with the expected design, thereby significantly improving the printing quality.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a monitoring device for intelligent correction of printed patterns on the surface of cup bags, comprising a first shell and a second shell installed on the ground and symmetrically distributed, the first shell being located behind the second shell, guide frames being fixedly installed on the left surfaces of the first shell and the second shell, the guide shafts of the guide frames being used to guide the cup bag film blown by the film blowing process of the film blowing machine to the next process, a printing device and a compensation device being respectively arranged from left to right on the surfaces opposite to each other of the first shell and the second shell, the printing device comprising a first cylinder, a first impression roller and a first plate roller, the first cylinder extending out to drive the first cylinder in rotation The first impression roller in the state moves vertically downward along the height direction of the first shell body, and the first impression roller and the first plate roller in the rotating state cooperate with each other to print the surface pattern of the cup bag film passing through the first impression roller and the first plate roller. The compensation device includes a second cylinder, a second impression roller and a second plate roller. When the printing device prints an incomplete pattern on the surface of the cup bag film, the second cylinder is extended to drive the second pressure roller to move vertically downward along the height direction of the first shell body, and the second impression roller and the second plate roller cooperate with each other to re-cover and print the area on the surface of the dried cup bag film where the incomplete printing pattern exists;

[0007] It also includes an information collection unit, an analysis and processing unit, and a control unit, wherein:

[0008] When the first impression roller and the first plate roller of the printing device print the surface pattern of the cup bag film passing between the first impression roller and the first plate roller, the information acquisition unit visually detects the printed pattern on the surface of the cup bag film after printing by the printing device, establishes a cup bag film detection data set and timestamps it; sends the cup bag film detection data set to the analysis and processing unit, analyzes and processes the integrity of the printed pattern on the surface of the cup bag film, and judges the printing quality of the cup bag film by the matching degree between the actual printed pattern and the expected design pattern;

[0009] When the degree of match between the actual printed pattern and the expected design pattern is greater than the corresponding threshold value, it is determined to be an unqualified printed pattern. According to the moving path of the unqualified printed pattern and the timestamp when the information acquisition unit detects the unqualified printed pattern, the start time of the compensation device to re-cover and print the unqualified printed pattern is calculated, and the control unit forms a real-time control instruction; the compensation device and the printing device adjust the printing pressure until the unqualified printed pattern approaches the compensation device, and the adjusted compensation device re-covers and prints it. After printing is completed, the information acquisition unit monitors the pattern after covering and printing, and the analysis and processing unit evaluates whether it is necessary to further adjust the printing pressure of the compensation device and the printing device. If the analysis and processing unit determines that the degree of match between the re-covered printed pattern and the expected design pattern is within the corresponding threshold range, the control unit controls the compensation device to reset; otherwise, the printing pressure of the compensation device and the printing device is further adjusted.

[0010] Preferably, a drying device is provided above the printing device and the compensation device, and the drying device is used to separately dry the surface pattern of the cup bag film printed by the printing device and the surface pattern of the cup bag film re-printed by the compensation device. A plurality of guide rollers are rotatably sleeved on the opposite surfaces of the first shell and the second shell, and the drying device includes a drying box fixedly installed between the opposite surfaces of the first shell and the second shell, and the interior of the drying box is composed of two independent drying chambers, and the front inner wall and the rear inner wall of the two drying chambers of the drying box are rotatably sleeved with traction rollers for guiding the cup bag film to move in the drying chamber.

[0011] Preferably, a first heating tube is fixedly installed on the rear inner wall of the drying chamber located on the left side inside the drying box, the front side of the first heating tube is fixedly installed on the front inner wall of the drying chamber, and the first heating tube is distributed in parallel with the moving path of the cup bag film inside the drying chamber;

[0012] A second heating tube is fixedly installed on the rear inner wall of the other drying chamber located on the right side inside the drying box, the front side of the second heating tube is fixedly installed on the front inner wall of the other drying chamber, and the second heating tube is distributed in parallel with the moving path of the cup bag film inside the other drying chamber.

[0013] Preferably, the printing device also includes a support block fixedly installed between the relative surfaces of the first shell and the second shell and symmetrically distributed, the first cylinder is fixedly sleeved in the support block mounting hole located on the left side of the first shell, the second cylinder is fixedly sleeved in another support block mounting hole located on the right side of the first shell, one end of the piston rod of the first cylinder and the second cylinder is fixedly installed with a displacement frame by bolts, the displacement frame located below the first cylinder is rotatably sleeved on the two ends of the core shaft of the first impression roller through bearings, and the displacement frame located below the second cylinder is rotatably sleeved on the two ends of the core shaft of the second impression roller through bearings, the first shell and the second shell are both provided with cavities inside, and symmetrically distributed lifting slide grooves are both provided between the relative surfaces of the first shell and the second shell, and an inner wall on one side of the lifting slide groove is connected to the inner wall of the cavity.

[0014] Preferably, a lifting slide plate is slidably sleeved on the inner wall of the lifting slide groove, and a first connecting shaft is rotatably sleeved on the inner wall of the lifting slide plate, and four first connecting shafts are divided into two groups in pairs, and one end of the opposite surface of the first connecting shafts in one group is fixedly installed with the two ends of the core shaft of the first impression roller by bolts, and one end of the opposite surface of the first connecting shafts in the other group is fixedly installed with the two ends of the core shaft of the second impression roller by bolts, and a detachable reinforcement ring group is fixedly installed at the connection between the first connecting shaft and the first impression roller by bolts, and the reinforcement ring is composed of two reinforcement rings;

[0015] The other end of one of the first connecting shafts in each group is fixedly sleeved with a first gear, and the first gear is located inside a cavity in the first shell. The other end of another first connecting shaft in each group extends to the inside of a cavity in the second shell. The front side of the first shell is rotatably sleeved with symmetrically distributed second connecting shafts, one end of one of the second connecting shafts is plugged into one end of the core shaft of the first roller, and one end of another second connecting shaft is plugged into one end of the core shaft of the second roller.

[0016] Preferably, the other ends of the two second connecting shafts extend to the inside of the cavity located in the first shell, and are fixedly sleeved with a second gear meshing with the first gear. A driving motor is fixedly installed on the inner bottom wall of the cavity located in the first shell, and the output shaft of the driving motor is fixedly connected to the other end of one of the second connecting shafts through a coupling. Adjacent second connecting shafts located in the cavity of the first shell are connected through a belt transmission mechanism. A symmetrically distributed clamping cylinder is fixedly installed on the inner wall of the cavity located in the second shell, and one end of the piston rod of the clamping cylinder is rotatably sleeved with a third connecting shaft, one end of one of the third connecting shafts is plugged into the other end of the core shaft of the first version roller, and one end of the other third connecting shaft is plugged into the other end of the core shaft of the second version roller. The outer surface of the third connecting shaft is slidably sleeved with the inner wall of the mounting hole of the second shell. A movable ink supply assembly is arranged below the first version roller and the second version roller, and the ink supply assembly includes an ink delivery cylinder fixedly installed on the ground, and an ink tank is fixedly installed on the top of the piston rod of the ink delivery cylinder. An ink scraping assembly is arranged on the left side of the ink supply assembly.

[0017] The ink scraping assembly includes a mounting sleeve fixedly mounted on the ground, the inner wall of the mounting sleeve is fixedly sleeved with a piston sleeve, the left inner wall of the piston sleeve is threadedly connected with an extrusion rod, the right inner wall of the piston sleeve is slidably sleeved with a push rod, the inner top wall of the piston sleeve located between the extrusion rod and the push rod is provided with an oil filling port for filling hydraulic oil into the piston sleeve, the upper left upper surface of the outer surface of the first and second rollers are provided with ink scrapers for scraping off ink and are symmetrically distributed, the outer surface of the ink scraper is fixedly mounted with a tool mounting frame, adjacent tool mounting frames are fixedly mounted by connecting plates, and one end of the push rod is fixedly connected to the left side surface of one of the tool mounting frames.

[0018] Preferably, the compensation device also includes a passive slide groove opened on the relative surfaces of the first shell and the second shell and symmetrically distributed, the inner wall of the passive slide groove is slidably sleeved with a passive slider, the left inner wall of the passive slide groove is fixedly connected with a spring, one end of the spring is fixedly connected to the left surface of the passive slider, the inner wall of the mounting hole of the passive slider is rotatably sleeved with a guide roller, one end of the relative surface of another group of the first connecting shafts is fixedly sleeved with an extrusion disk, the outer surface of the extrusion disk is rotatably sleeved with rotating balls distributed in a ring array, the outer surface of the rotating balls is in rolling contact with the inner wall of the arc-shaped slide groove of the passive slider, and symmetrically distributed connecting blocks are fixedly connected between the relative surfaces of the first shell and the second shell.

[0019] Preferably, the information acquisition unit includes a first high-resolution camera and a second high-resolution camera, wherein the first high-resolution camera is fixedly mounted at the center of the upper left surface of one of the connecting blocks parallel to the moving path of the cup bag film, and the first high-resolution camera is located between the printing device and the compensation device, and the second high-resolution camera is fixedly mounted at the center of the upper left surface of another connecting block parallel to the moving path of the cup bag film, and the second high-resolution camera is located on the right side of the compensation device, wherein:

[0020] The first high-resolution camera performs real-time visual inspection and preprocessing of the printed pattern on the surface of the cup bag film after printing by the printing device, including time-stamping the image data collected in real time by the first high-resolution camera, thereby establishing a cup bag film inspection data set with time-stamping.

[0021] Preferably, the analysis and processing unit comprises a database, wherein:

[0022] The cup bag film detection data set with time stamp is sent to the analysis and processing unit for processing, and the processing process includes: firstly processing the data in time sequence, performing image correction and denoising;

[0023] Secondly, the Sobel operator of edge detection is used to extract the horizontal and vertical edge features of the printed pattern on the surface of the processed cup bag, and the Harris corner detection is used to extract the corner points and intersections of the printed pattern on the surface of the processed cup bag. The gray-level co-occurrence matrix is ​​used to extract its texture features. Subsequently, the expected design pattern pre-stored in the total number of pixels in the database is called to match the actual printed pattern with the expected design pattern pixel by pixel, and the matching degree is calculated using the mean square error. The specific calculation formula is:

[0024]

[0025] Among them, I actual (i) and I expected (i) represents the pixel values ​​of the actual printed pattern and the expected design pattern, respectively, and N represents the total number of pixels;

[0026] After the analysis and processing unit obtains the calculation result of MSE, it is determined whether the matching degree between the actual printed pattern and the expected design pattern exceeds the corresponding threshold value. Specifically, if MSE=0, it means that the actual printed pattern completely matches the design pattern; if 0<MSE<10, it means that there are some acceptable differences between the actual printed pattern and the expected design pattern; if MSE>10, it means that the error is large and the matching degree is low. The printed pattern is unqualified and needs to be reprinted;

[0027] After determining that the printed pattern needs to be reprinted, the starting time of the re-covering printing of the unqualified printed pattern by the compensation device is calculated according to the moving path of the unqualified printed pattern and the timestamp when the information acquisition unit detects the unqualified printed pattern. The specific calculation formula is:

[0028]

[0029] T represents the start time of the compensation device to re-cover the unqualified pattern, d represents the distance between the printing area of ​​the printing device and the printing area of ​​the compensation device, v represents the moving speed of the cup bag film, t 补偿时间 It indicates the time taken by the information acquisition unit to analyze and process the printed pattern after detecting the printed pattern.

[0030] Preferably, based on the start time of re-printing of the unqualified pattern by the compensation device calculated by the analysis and processing unit, the control unit forms a real-time control instruction; within the pressure range recommended by the gravure printing equipment, the printing device gradually adjusts the printing pressure by increasing it by 1-2 units each time, and the compensation device adjusts the printing pressure by adding 1-2 units to the original printing pressure of the printing device for the first compensation, and each subsequent compensation gradually adjusts the printing pressure by increasing it by 1-2 units each time, and the adjusted compensation device re-prints it, and after printing is completed, the second high-resolution camera of the information collection unit monitors the pattern after overprinting, and feeds the monitoring data back to the analysis and processing unit, which calculates the matching degree between the pattern after overprinting and the expected design pattern, and determines whether it is necessary to further adjust the printing pressure of the compensation device and the printing device.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] In the process of printing patterns on the surface of the cup bag film blown by the film blowing machine, the present invention can timely detect and correct printing defects through real-time detection and compensation mechanisms, ensuring that the pattern of the final product is highly consistent with the expected design, thereby significantly improving the printing quality. Specifically: a high-precision information acquisition unit is used to monitor the printed pattern and compare it with the expected design to ensure the integrity and accuracy of the pattern. Secondly, the compensation device can automatically adjust the pressure and reprint when unqualified printing is detected, reducing the need for human intervention, making the production process more efficient and continuous, and reducing downtime. The real-time feedback mechanism allows for rapid correction of incomplete printed patterns, ensuring the continuity and efficiency of the production process. In addition, the compensation device reprints unqualified patterns, further improving product quality. Combining the above measures, not only the scrap rate and production fluctuations are reduced, but also the market appeal and brand image of the product are significantly improved, the market competitiveness is enhanced, and the stability and consistency of the production process are ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the working process of the printing device of the present invention;

[0034] Figure 2 It is a three-dimensional diagram of the guide frame structure of the present invention;

[0035] Figure 3 A three-dimensional diagram of the traction roller structure of the present invention;

[0036] Figure 4 For the present invention Figure 3 A magnified view of the structure at center;

[0037] Figure 5 This is a three-dimensional diagram of the drive motor structure of the present invention;

[0038] Figure 6 For the present invention Figure 5 A magnified view of the structure at B in the middle;

[0039] Figure 7 This is a three-dimensional diagram of the third connecting shaft structure of the present invention;

[0040] Figure 8 This is a three-dimensional diagram of the first gear structure of the present invention;

[0041] Fig. 9 It is an exploded schematic diagram of the third connecting shaft structure of the present invention.

[0042] In the figure: 1, first housing; 2, second housing; 3, guide frame; 4, first cylinder; 41, first impression roller; 42, first plate roller; 43, guide roller; 44, support block; 45, displacement frame; 46, cavity; 47, lifting chute; 48, lifting slide plate; 49, first connecting shaft; 410, reinforcement ring group; 411, first gear; 412, second connecting shaft; 413, driving motor; 414, clamping cylinder; 415, third connecting shaft; 416, second gear; 5, second cylinder; 51, second impression roller; 52, second plate roller; 53, passive chute; 54, passive slide block; 55 , spring; 56, guide roller; 57, extrusion plate; 58, rotating ball; 59, connecting block; 6, information acquisition unit; 61, first high-resolution camera; 62, second high-resolution camera; 7, analysis and processing unit; 71, database; 8, control unit; 9, drying box; 91, drying chamber; 92, traction roller; 93, first heating tube; 94, second heating tube; 10, ink delivery cylinder; 101, ink tank; 11, mounting sleeve; 111, piston sleeve; 112, extrusion rod; 113, push rod; 114, oil filling port; 115, scraper; 116, tool mounting bracket; 117, connecting plate. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0044] like Figures 1 to 9 As shown, the present invention provides a monitoring device for intelligent correction of printed patterns on the surface of cup bags, comprising a first shell 1 and a second shell 2 installed on the ground and symmetrically distributed, the first shell 1 is located behind the second shell 2, and the left surfaces of the first shell 1 and the second shell 2 are fixedly installed with guide frames 3, and the guide shafts of the guide frames 3 are used to guide the cup bag film blown by the film blowing process of the film blowing machine to the next process, wherein the guide shafts of the guide frames 3 are rotatably sleeved on the inner surface of the guide frames 3, and the guide shafts are arranged in an inclined manner from low to high and from left to right on the inner surface of the guide frames 3, and there are three of them in total. The guide frames 3 arranged as above can optimize the guiding stability and accuracy of the cup bag film, and at the same time, the guide shafts arranged in an inclined manner from low to high help to gradually guide the cup bag film, reduce friction and wrinkles, and thus ensure that the cup bag film smoothly transitions to the next process;

[0045] A printing device and a compensation device are respectively arranged on the surfaces opposite to each other of the first shell 1 and the second shell 2 from left to right. The printing device comprises a first cylinder 4, a first impression roller 41 and a first plate roller 42. The first cylinder 4 extends to drive the first impression roller 41 in a rotating state to move vertically downward along the height direction of the first shell 1. Through the cooperation between the first impression roller 41 and the first plate roller 42 in a rotating state, the surface pattern of the cup bag film passing through the first impression roller 41 and the first plate roller 42 is printed. The compensation device comprises a second cylinder 5, a second impression roller 51 and a second plate roller 52. When the printing device prints an incomplete pattern on the surface of the cup bag film, the second cylinder 5 is extended to drive the second pressure roller to move vertically downward along the height direction of the first shell 1. Through the cooperation between the second impression roller 51 and the second plate roller 52, the area on the surface of the dried cup bag film with an incomplete printing pattern is re-covered and printed.

[0046] It also includes an information collection unit 6, an analysis and processing unit 7 and a control unit 8, wherein:

[0047] When the first impression roller 41 and the first plate roller 42 of the printing device print the surface pattern of the cup bag film passing between the first impression roller 41 and the first plate roller 42, the information acquisition unit 6 performs visual inspection on the printed pattern on the surface of the cup bag film after printing by the printing device, establishes a cup bag film inspection data set and timestamps it; the cup bag film inspection data set is sent to the analysis and processing unit 7, and the integrity of the printed pattern on the surface of the cup bag film is analyzed and processed, and the printing quality of the cup bag film is judged by the matching degree between the actual printed pattern and the expected design pattern;

[0048] When the degree of match between the actual printed pattern and the expected design pattern is greater than the corresponding threshold value, that is, when the printed pattern on the surface of the cup bag film is analyzed to be incomplete with reference to the expected design pattern, it is determined to be an unqualified printed pattern. According to the moving path of the unqualified printed pattern, the timestamp of the information acquisition unit 6 detecting the unqualified printed pattern is obtained, and the start time of the re-covering printing of the unqualified printed pattern by the compensation device is calculated, and the control unit 8 forms a real-time control instruction; the compensation device and the printing device adjust the printing pressure until the unqualified printed pattern approaches the compensation device, and the adjusted compensation device re-covers and prints it. After the printing is completed, the information acquisition unit 6 monitors the pattern after the covering print, and the analysis and processing unit 7 evaluates whether it is necessary to further adjust the printing pressure of the compensation device and the printing device. If the analysis and processing unit 7 determines that the degree of match between the re-covered printed pattern and the expected design pattern is within the corresponding threshold range, the control unit 8 controls the compensation device to reset, and the adjusted printing device continues normal production. Otherwise, the printing pressure of the compensation device and the printing device is further adjusted.

[0049] By adopting the above technical scheme, in the process of printing patterns on the surface of the cup bag film blown by the film blowing machine, the printing device can timely detect and correct printing defects through real-time detection and compensation mechanism, ensuring that the pattern of the final product is highly consistent with the expected design, thereby significantly improving the printing quality. Specifically: a high-precision information acquisition unit 6 is used to monitor the printed pattern and compare it with the expected design to ensure the integrity and accuracy of the pattern. Secondly, the compensation device can automatically adjust the pressure and reprint when unqualified printing is detected, reducing the need for human intervention, making the production process more efficient and continuous, and reducing downtime. The real-time feedback mechanism allows for rapid correction of incomplete printed patterns, ensuring the continuity and efficiency of the production process. In addition, the compensation device reprints unqualified patterns, further improving product quality. Combining the above measures, not only the scrap rate and production fluctuations are reduced, but also the market appeal and brand image of the product are significantly improved, the market competitiveness is enhanced, and the stability and consistency of the production process are ensured.

[0050] like Figure 2 , Figure 3 and Figure 5 As shown, a drying device is arranged above the printing device and the compensation device. The drying device is used to separately dry the surface pattern of the cup bag film printed by the printing device and the surface pattern of the cup bag film re-printed by the compensation device. The drying device is arranged to call the information collection unit 6 and the analysis and processing unit 7 during the cup bag printing process. If the pattern is found to be incomplete, the last printed pattern is dried first, and then reprinted. This operation step ensures that the new pattern can correctly cover the defect. However, after the pattern is found to be incomplete, if it is directly printed again, it is easy to cause inconsistent pattern overlap, affecting the final effect. The relative surfaces of the first shell 1 and the second shell 2 are rotatably sleeved with a plurality of guide rollers 43. The guide rollers 43 are arranged to help gradually guide the cup bag film so that it can move smoothly in the printing device, the drying device and the compensation device. The drying device includes a drying box 9 fixedly installed between the relative surfaces of the first shell 1 and the second shell 2. The interior of the drying box 9 is composed of two independent drying chambers 91. The front inner wall and the rear inner wall of the two drying chambers 91 of the drying box 9 are rotatably sleeved with traction rollers 92 for guiding the cup bag film to move in the drying chamber 91;

[0051] A first heating tube 93 is fixedly installed on the rear inner wall of the drying chamber 91 located on the left side inside the drying box 9. The front of the first heating tube 93 is fixedly installed on the front inner wall of the drying chamber 91, and the first heating tube 93 is parallel to the moving path of the cup bag film inside the drying chamber 91. In order to ensure that the cup bag film can be evenly heated when passing through the drying chamber 91, the present application adopts a method of paralleling the first heating tube 93 with the moving path of the cup bag film, thereby ensuring that the entire printed pattern surface of the cup bag film can be evenly heated, thereby improving the drying effect;

[0052] A second heating tube 94 is fixedly installed on the rear inner wall of another drying chamber 91 located on the right side inside the drying box 9, the front side of the second heating tube 94 is fixedly installed on the front inner wall of the other drying chamber 91, and the second heating tube 94 is distributed in parallel with the moving path of the cup bag film inside the other drying chamber 91.

[0053] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 8 and Fig. 9 As shown, the printing device also includes a support block 44 fixedly mounted between the opposite surfaces of the first shell 1 and the second shell 2 and symmetrically distributed, the first cylinder 4 is fixedly sleeved in the mounting hole of the support block 44 located on the left side of the first shell 1, and the second cylinder 5 is fixedly sleeved in the mounting hole of another support block 44 located on the right side of the first shell 1, and a displacement frame 45 is fixedly mounted on one end of the piston rod of the first cylinder 4 and the second cylinder 5 by bolts, the displacement frame 45 located below the first cylinder 4 is rotatably sleeved on both ends of the core shaft of the first impression roller 41 through bearings, and the displacement frame 45 located below the second cylinder 5 is rotatably sleeved on both ends of the core shaft of the second impression roller 51 through bearings, and cavities 46 are provided inside the first shell 1 and the second shell 2, and lifting grooves 47 symmetrically distributed are provided between the opposite surfaces of the first shell 1 and the second shell 2, and the inner wall of one side of the lifting groove 47 is connected to the inner wall of the cavity 46;

[0054] A lifting slide plate 48 is slidably sleeved on the inner wall of the lifting slide groove 47, and a first connecting shaft 49 is rotatably sleeved on the inner wall of the lifting slide plate 48. The four first connecting shafts 49 are divided into two groups in pairs, and one end of the opposite surface of one group of the first connecting shafts 49 is fixedly installed with the two ends of the core shaft of the first impression roller 41 by bolts, and one end of the opposite surface of the other group of the first connecting shafts 49 is fixedly installed with the two ends of the core shaft of the second impression roller 51 by bolts. A detachable reinforcement ring group 410 is fixedly installed at the connection between the first connecting shaft 49 and the first impression roller 41 by bolts. The reinforcement ring is composed of two reinforcement rings. The reinforcement ring group 410 is provided to provide additional stability and support for the connection between the first connecting shaft 49 and the first impression roller 41 by using the reinforcement ring, so as to ensure that the connection between the first connecting shaft 49 and the first impression roller 41 remains firm during use, while allowing disassembly and maintenance when necessary.

[0055] The other end of one of the first connecting shafts 49 of each group is fixedly sleeved with a first gear 411, and the first gear 411 is located inside the cavity 46 in the first shell 1. The other end of the other first connecting shaft 49 of each group extends to the inside of the cavity 46 of the second shell 2. The front of the first shell 1 is rotatably sleeved with symmetrically distributed second connecting shafts 412, one end of one of the second connecting shafts 412 is plugged into one end of the core shaft of the first version roller 42, and one end of the other second connecting shaft 412 is plugged into one end of the core shaft of the second version roller 52;

[0056] The other ends of the two second connecting shafts 412 extend to the interior of the cavity 46 located in the first shell 1, and are fixedly sleeved with a second gear 416 meshing with the first gear 411. A driving motor 413 is fixedly installed on the inner bottom wall of the cavity 46 located in the first shell 1. The output shaft of the driving motor 413 is fixedly connected to the other end of one of the second connecting shafts 412 through a coupling. The adjacent second connecting shafts 412 inside the cavity 46 located in the first shell 1 are connected by a belt transmission mechanism. The inner wall of the cavity 46 located in the second shell 2 is fixedly installed with symmetrically distributed clamping cylinders 414. The clamping cylinders 414 are fixedly installed on the inner wall of the cavity 46 located in the second shell 2. One end of the piston rod of the cylinder 414 is rotatably sleeved with a third connecting shaft 415, one end of one of the third connecting shafts 415 is plugged with the other end of the core shaft of the first plate roller 42, and one end of the other third connecting shaft 415 is plugged with the other end of the core shaft of the second plate roller 52. The outer surface of the third connecting shaft 415 is slidably sleeved with the inner wall of the mounting hole of the second shell 2. A movable ink supply assembly is arranged below the first plate roller 42 and the second plate roller 52. The ink supply assembly includes an ink delivery cylinder 10 fixedly mounted on the ground, an ink tank 101 is fixedly mounted on the top of the piston rod of the ink delivery cylinder 10, and an ink scraping assembly is arranged on the left side of the ink supply assembly.

[0057] The ink scraping assembly includes a mounting sleeve 11 fixedly mounted on the ground, the inner wall of the mounting sleeve 11 is fixedly sleeved with a piston sleeve 111, the left inner wall of the piston sleeve 111 is threadedly connected with an extrusion rod 112, the right inner wall of the piston sleeve 111 is slidably sleeved with a push rod 113, and the inner top wall of the piston sleeve 111 located between the extrusion rod 112 and the push rod 113 is provided with an oil filling port 114 for filling hydraulic oil into the piston sleeve 111, and the upper left upper surfaces of the first plate roller 42 and the second plate roller 52 are provided with ink scrapers 115 for scraping off ink and are symmetrically distributed, and the outer surface of the ink scraper 115 is fixedly mounted with a tool mounting bracket 116, and adjacent tool mounting brackets 116 are fixedly mounted by connecting plates 117, and one end of the push rod 113 is fixedly connected to the left side surface of one of the tool mounting brackets 116.

[0058] The above scheme is adopted: the ink delivery cylinder 10 located below the printing device is started, and the ink delivery cylinder 10 drives the ink tank 101 filled with ink to move upward along the height direction of the first shell 1, so that the first plate roller 42 contacts the ink in the ink tank 101, and the piston sleeve 111 is threadedly connected with the squeezing rod 112, and the squeezing rod 112 is rotated to squeeze the hydraulic oil in the piston sleeve 111 to generate oil pressure, and the push rod 113 is driven by the oil pressure to move from left to right along the length direction of the first shell 1, and the scrapers 115 on the two tool mounting frames 116 are driven to contact the outer surfaces of the first plate roller 42 and the second plate roller 52 respectively through the cooperation of the tool mounting frame 116 and the connecting plate 117, so as to ensure that the excess ink on the first plate roller 42 and the second plate roller 52 can be scraped off and flow back into the ink tank 101.

[0059] like Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 As shown, the compensation device also includes a passive slide groove 53 which is opened on the relative surfaces of the first shell 1 and the second shell 2 and is symmetrically distributed. A passive slider 54 is slidably sleeved on the inner wall of the passive slide groove 53. A spring 55 is fixedly connected to the left inner wall of the passive slide groove 53. One end of the spring 55 is fixedly connected to the left surface of the passive slider 54. A guide roller 56 is rotatably sleeved on the inner wall of the mounting hole of the passive slider 54. An extrusion disk 57 is fixedly sleeved on one end of the relative surface of another group of first connecting shafts 49. Rotating balls 58 distributed in a ring array are rotatably sleeved on the outer surface of the extrusion disk 57. The outer surface of the rotating balls 58 is in rolling contact with the inner wall of the arc-shaped slide groove of the passive slider 54. Symmetrically distributed connecting blocks 59 are fixedly connected between the relative surfaces of the first shell 1 and the second shell 2.

[0060] The above scheme is adopted: when the compensation device makes compensation for the first time, the printing pressure is adjusted by adding 1-2 units to the original printing pressure of the printing device, and the displacement frame 45 under the second cylinder 5 is connected with the rotation sleeve of the two ends of the core shaft of the second impression cylinder 51 through the bearing, the inner wall of the lifting slide 47 is connected with the lifting slide plate 48, the inner wall of the lifting slide plate 48 is connected with the first connecting shaft 49, and one end of the opposite surface of the other group of first connecting shafts 49 is fixedly installed on the two ends of the core shaft of the second impression cylinder 51 through bolts, so as to control the second cylinder 5 to drive ... The impression roller 51 moves downward along the height direction of the first housing 1. While the second impression roller 51 rotates and moves downward, it drives the extrusion disc 57 fixedly sleeved at one end of the relative surface of the two first connecting shafts 49 of the other group to rotate, so that the rotating ball 58 on the surface of the extrusion disc 57 rolls with the inner wall of the arc-shaped slide groove of the passive slider 54. As the second cylinder 5 continues to extend, the rotating ball 58 continuously squeezes the passive slider 54, and through the sliding sleeve connection between the passive slider 54 and the passive slide groove 53, the passive slider 54 is driven to move from left to right in the passive slide groove 53.

[0061] When the analysis and processing unit 7 determines that the matching degree between the re-covered printed pattern and the expected design pattern meets the threshold range, the control unit 8 will issue a control instruction to control the compensation device to reset. At this time, under the elastic force of the belt spring 55, the passive slider 54 automatically resets, and the guide roller 56 stably guides the transportation of the cup bag film.

[0062] like Figure 1 , Figure 3 and Figure 5 As shown, the information acquisition unit 6 includes a first high-resolution camera 61 and a second high-resolution camera 62. The configuration of the first high-resolution camera 61 and the second high-resolution camera 62 ensures that the entire process from printing to compensation is within the monitoring range, which is helpful to timely discover and correct problems. The first high-resolution camera 61 is fixedly installed at the center of the upper left surface of one of the connecting blocks 59 that is parallel to the moving path of the cup bag film, and the first high-resolution camera 61 is located between the printing device and the compensation device, responsible for real-time monitoring of the printed pattern, and immediately detecting the pattern quality after printing is completed, and timely discovering printing defects or mismatches. The second high-resolution camera 62 is fixedly installed at the center of the upper left surface of another connecting block 59 that is parallel to the moving path of the cup bag film, and the second high-resolution camera 62 is located on the right side of the compensation device, responsible for monitoring the pattern processed by the compensation device, ensuring the accuracy of the compensation device when adjusting the pattern, and detecting whether the compensation effect meets expectations, wherein,

[0063] The first high-resolution camera 61 performs real-time visual inspection and preprocessing of the printed pattern on the surface of the cup bag film after printing by the printing device, including time stamping the image data collected in real time by the first high-resolution camera 61, thereby establishing a cup bag film inspection data set with a time stamp, which helps to track the time information of each image data, so as to analyze the changes and abnormalities in the printing process;

[0064] The analysis and processing unit 7 comprises a database 71, wherein:

[0065] The cup bag film detection data set with a timestamp is sent to the analysis and processing unit 7 for processing. The processing process includes: firstly, processing the data in chronological order, performing image correction and denoising; in the application, if the cup bag printing pattern has geometric distortion, the image correction preferably adopts the perspective transformation method to correct the image, and the denoising adopts the mean filter, and the specific calculation formula is:

[0066]

[0067] Among them, I(x,y) represents the pixel value of the original image, I′(x,y) represents the pixel value after filtering, (Ω) represents the filter window, and K represents the size of the window;

[0068] Secondly, the Sobel operator of edge detection is used to extract the horizontal and vertical edge features of the printed pattern on the surface of the processed cup bag, and the Harris corner detection is used to extract the corner points and intersections of the printed pattern on the surface of the processed cup bag. The gray level co-occurrence matrix is ​​used to extract its texture features, including contrast, correlation, and uniformity. Subsequently, the expected design pattern pre-stored in the total number of pixels represented by the database 71 is called, and the actual printed pattern is matched with the expected design pattern pixel by pixel. The matching degree is calculated using the mean square error. The specific calculation formula is:

[0069]

[0070] Among them, I actual (i) and I expected (i) represents the pixel values ​​of the actual printed pattern and the expected design pattern, respectively, and N represents the total number of pixels;

[0071] After the analysis and processing unit 7 obtains the calculation result of MSE, it is determined whether the matching degree between the actual printed pattern and the expected design pattern exceeds the corresponding threshold value. Specifically, if MSE=0, it means that the actual printed pattern completely matches the design pattern. If 0<MSE<10, it means that there are some acceptable differences between the actual printed pattern and the expected design pattern, because this is caused by small errors in image processing and slight deviations in pattern printing. If MSE>10, it means that the error is large and the matching degree is low. This printed pattern is unqualified and needs to be reprinted.

[0072] After determining that the printed pattern needs to be reprinted, the starting time of the re-covering printing of the unqualified printed pattern by the compensation device is calculated according to the moving path of the unqualified printed pattern and the timestamp when the information acquisition unit 6 detects the unqualified printed pattern. The specific calculation formula is:

[0073]

[0074] T represents the start time of the compensation device to re-cover the unqualified pattern, d represents the distance between the printing area of ​​the printing device and the printing area of ​​the compensation device, v represents the moving speed of the cup bag film, t 补偿时间 It represents the time taken by the information acquisition unit 6 to analyze and process the printed pattern after detecting the printed pattern. The specific value is determined through experiments;

[0075] Based on the start time of re-printing of the unqualified pattern by the compensation device calculated by the analysis and processing unit 7, the control unit 8 forms a real-time control instruction; within the pressure range recommended by the gravure printing equipment, the printing device gradually adjusts the printing pressure by increasing it by 1-2 units each time, and the compensation device adjusts the printing pressure by adding 1-2 units to the original printing pressure of the printing device for the first compensation. Each subsequent compensation gradually adjusts the printing pressure by increasing it by 1-2 units each time, and the adjusted compensation device re-prints it. After printing, the second high-resolution camera 62 of the information collection unit 6 monitors the pattern after overprinting, and feeds the monitoring data back to the analysis and processing unit 7, which calculates the matching degree between the pattern after overprinting and the expected design pattern to determine whether it is necessary to further adjust the printing pressure of the compensation device and the printing device.

[0076] The working principle and use process of the present invention:

[0077] Step 1: Before printing on the cup bag film, make preparations. First, the ink delivery cylinder 10 located below the printing device is started. The ink delivery cylinder 10 drives the ink tank 101 filled with ink to move upward along the height direction of the first shell 1, so that the first plate roller 42 contacts the ink in the ink tank 101. Through the threaded connection between the piston sleeve 111 and the squeezing rod 112, the squeezing rod 112 is rotated to squeeze the hydraulic oil in the piston sleeve 111 to generate oil pressure. The oil pressure drives the push rod 113 to move from left to right along the length direction of the first shell 1. Through the cooperation of the tool mounting frame 116 and the connecting plate 117, the scrapers 115 on the two tool mounting frames 116 are driven to contact the outer surfaces of the first plate roller 42 and the second plate roller 52 respectively, ensuring that the excess ink on the first plate roller 42 and the second plate roller 52 can be scraped off and flowed back to the ink tank 101;

[0078] Secondly, based on the cup bag films of different materials produced by the film blowing machine, the temperature of the printed pattern on the surface of the cup bag film after printing by the printing device and the compensation device is adjusted by the drying device, so as to ensure that the printed pattern on the surface of the cup bag film can be stably formed and avoid the overheating of the surface of the cup bag film. According to the printing requirements, one end of the mandrel of the first version roller 42 and the second version roller 52 is respectively plugged with one end of two second connecting shafts 412, and the two clamping cylinders 414 are started to drive the two third connecting shafts 415 to be plugged with the other end of the mandrel of the first version roller 42 and the second version roller 52, thereby completing the installation of the first version roller 42 and the second version roller 52;

[0079] Finally, the cup bag film blown by the film blowing machine is guided in sequence through the printing device, the drying chamber 91 in the drying box 9 in the drying device located on the left side of the first shell 1, the compensation device, and the drying chamber 91 in the drying box 9 in the drying device located on the right side of the first shell 1. In addition, according to customer needs, the overall structure of the printing process of the film blowing machine for cup bag production of this application is set with multiple colors, so as to print a more colorful printed pattern on the surface of the cup bag film;

[0080] Step 2: Control the driving motor 413, which converts electrical energy into mechanical energy, drives one of the second connecting shafts 412 to rotate, and drives the adjacent second connecting shaft 412 located inside the inner cavity 46 of the first shell 1 to achieve synchronous rotation through the belt transmission mechanism. The belt transmission mechanism drives the first impression roller 41 and the first plate roller 42 in the printing device, and the second impression roller 51 and the second plate roller 52 in the compensation device to achieve synchronous rotation through the external meshing of the first gear 411 and the second gear 416, thereby starting the printing action on the cup bag film blown by the film blowing machine;

[0081] Step 3, calling the information acquisition unit 6, the analysis and processing unit 7 and the control unit 8, when the first impression roller 41 and the first plate roller 42 of the printing device print the surface pattern of the cup bag film passing between the first impression roller 41 and the first plate roller 42, the information acquisition unit 6 performs visual inspection on the printed pattern on the surface of the cup bag film after printing by the printing device, establishes a cup bag film inspection data set and timestamps it; sends the cup bag film inspection data set to the analysis and processing unit 7, analyzes and processes the integrity of the printed pattern on the surface of the cup bag film, and judges the printing quality of the cup bag film by the matching degree between the actual printed pattern and the expected design pattern;

[0082] When the matching degree between the actual printed pattern and the expected design pattern is greater than the corresponding threshold value, that is, when the printed pattern on the surface of the cup bag film is analyzed to be incomplete with reference to the expected design pattern, it is determined to be an unqualified printed pattern. According to the moving path of the unqualified printed pattern, the timestamp of the unqualified printed pattern detected by the information acquisition unit 6 is obtained, and the start time of the re-covering printing of the unqualified printed pattern by the compensation device is calculated, and the control unit 8 forms a real-time control instruction; the compensation device and the printing device adjust the printing pressure until the unqualified printed pattern approaches the compensation device, and the adjusted compensation device re-covers and prints it. After the printing is completed, the information acquisition unit 6 monitors the pattern after the covering print, and the analysis and processing unit 7 evaluates whether it is necessary to further adjust the printing pressure of the compensation device and the printing device. If the analysis and processing unit 7 determines that the matching degree between the re-covered printed pattern and the expected design pattern meets the corresponding threshold range, the control unit 8 controls the compensation device to reset, and the adjusted printing device continues normal production. Otherwise, the printing pressure of the compensation device and the printing device is further adjusted;

[0083] Step 4, when the control unit 8 controls the compensation device to re-cover the printed pattern on the surface of the cup bag film with the printed pattern, the specific operation process is as follows: based on the start time of the compensation device to re-cover the unqualified printed pattern calculated by the analysis and processing unit 7, the control unit 8 forms a real-time control instruction; first, the ink delivery cylinder 10 located below the compensation device is controlled to start, and the ink delivery cylinder 10 drives the ink tank 101 filled with ink to move upward along the height direction of the first shell 1, so that the second plate roller 52 contacts the ink in the ink tank 101;

[0084] Secondly, when the compensation device makes compensation for the first time, the printing pressure is adjusted by adding 1-2 units to the original printing pressure of the printing device, and the displacement frame 45 under the second cylinder 5 is connected to the rotation sleeve of the two ends of the core shaft of the second impression roller 51 through the bearing, the inner wall of the lifting slide 47 is connected to the lifting slide plate 48, the inner wall of the lifting slide plate 48 is connected to the first connecting shaft 49, and one end of the opposite surface of the other group of first connecting shafts 49 is fixedly installed on the two ends of the core shaft of the second impression roller 51 through bolts, so as to control the second cylinder 5 to drive the second impression roller 51 to move. The printing cylinder 51 moves downward along the height direction of the first housing 1. While the second impression cylinder 51 rotates and moves downward, it drives the extrusion disk 57 fixedly sleeved at one end of the relative surface of the other two first connecting shafts 49 to rotate, so that the rotating ball 58 on the surface of the extrusion disk 57 rolls with the inner wall of the arc-shaped slide groove of the passive slider 54. As the second cylinder 5 continues to extend, the rotating ball 58 continuously squeezes the passive slider 54, and through the sliding sleeve connection between the passive slider 54 and the passive slide groove 53, the passive slider 54 is driven to move from left to right in the passive slide groove 53.

[0085] Thus, the unqualified pattern can be re-printed. After the printing is completed, the second high-resolution camera 62 of the information collection unit 6 monitors the pattern after the overprinting, and feeds the monitoring data to the analysis and processing unit 7. The analysis and processing unit 7 calculates the matching degree between the overprinting pattern and the expected design pattern, and determines whether it is necessary to further adjust the printing pressure of the compensation device and the printing device.

[0086] If the analysis and processing unit 7 determines that the matching degree between the re-covered printed pattern and the expected design pattern is within the corresponding threshold range, that is, MSE=0 or 0<MSE<10, the control unit 8 controls the compensation device to reset. At the same time, the passive slider 54 is driven to automatically reset under the action of the elastic force of the spring 55 itself.

[0087] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0088] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A monitoring device for intelligent correction of printed patterns on the surface of cup bags, comprising a first shell (1) and a second shell (2) installed on the ground and symmetrically distributed, wherein the first shell (1) is located behind the second shell (2), and a guide frame (3) is fixedly installed on the left side surface of the first shell (1) and the second shell (2), and the guide shaft of the guide frame (3) is used to guide the cup bag film blown by the film blowing process of the film blowing machine to the next process, characterized in that: A printing device and a compensation device are respectively arranged on the surfaces opposite to each other of the first shell (1) and the second shell (2) from left to right. The printing device comprises a first cylinder (4), a first impression roller (41) and a first plate roller (42). The first cylinder (4) extends to drive the first impression roller (41) in a rotating state to move vertically downward along the height direction of the first shell (1). Through the cooperation between the first impression roller (41) and the first plate roller (42) in a rotating state, a pattern on the surface of the cup bag film passing between the first impression roller (41) and the first plate roller (42) is printed. The compensation device comprises a second cylinder (5), a second impression roller (51) and a second plate roller (52). When the printing device prints an incomplete pattern on the surface of the cup bag film, the second cylinder (5) extends to drive the second pressure roller to move vertically downward along the height direction of the first shell (1). Through the cooperation between the second impression roller (51) and the second plate roller (52), the area on the surface of the dried cup bag film with an incomplete pattern is re-covered and printed. It also includes an information collection unit (6), an analysis and processing unit (7) and a control unit (8), wherein: When the first impression roller (41) and the first plate roller (42) of the printing device print the pattern on the surface of the cup bag film passing between the first impression roller (41) and the first plate roller (42), the information collection unit (6) performs visual inspection on the printed pattern on the surface of the cup bag film after printing by the printing device, establishes a cup bag film inspection data set and timestamps it; the cup bag film inspection data set is sent to the analysis and processing unit (7), the integrity of the printed pattern on the surface of the cup bag film is analyzed and processed, and the printing quality of the cup bag film is judged by the matching degree between the actual printed pattern and the expected design pattern; When the degree of match between the actual printed pattern and the expected design pattern is greater than a corresponding threshold, it is determined to be an unqualified printed pattern. Based on the moving path of the unqualified printed pattern and the timestamp of the information acquisition unit (6) detecting the unqualified printed pattern, the start time of the re-covering printing of the unqualified printed pattern by the compensation device is calculated, and the control unit (8) forms a real-time control instruction; the compensation device and the printing device adjust the printing pressure until the unqualified printed pattern approaches the compensation device, and the adjusted compensation device re-covers and prints it. After the printing is completed, the information acquisition unit (6) monitors the pattern after the overprinting, and the analysis and processing unit (7) evaluates whether it is necessary to further adjust the printing pressure of the compensation device and the printing device. If the analysis and processing unit (7) determines that the degree of match between the re-covered printed pattern and the expected design pattern is within the corresponding threshold range, the control unit (8) controls the compensation device to reset; otherwise, the compensation device and the printing device printing pressure are further adjusted.

2. The monitoring device for intelligent correction of printed patterns on the surface of cup bags according to claim 1, characterized in that: A drying device is arranged above the printing device and the compensation device, and the drying device is used to separately dry the surface pattern of the cup bag film printed by the printing device and the surface pattern of the cup bag film re-printed by the compensation device. The surfaces opposite to each other of the first shell (1) and the second shell (2) are rotatably sleeved with a plurality of guide rollers (43). The drying device comprises a drying box (9) fixedly mounted between the surfaces opposite to each other of the first shell (1) and the second shell (2), and the interior of the drying box (9) is composed of two independent drying chambers (91). The front inner wall and the rear inner wall of the two drying chambers (91) of the drying box (9) are both rotatably sleeved with traction rollers (92) for guiding the cup bag film to move in the drying chamber (91).

3. The monitoring device for intelligent correction of printed patterns on the surface of cup bags according to claim 2, characterized in that: A first heating tube (93) is fixedly installed on the rear inner wall of the drying chamber (91) located on the left side inside the drying box (9), the front face of the first heating tube (93) is fixedly installed on the front inner wall of the drying chamber (91), and the first heating tube (93) is distributed in parallel with the moving path of the cup bag film inside the drying chamber (91); A second heating tube (94) is fixedly mounted on the rear inner wall of the other drying chamber (91) located on the right side inside the drying box (9); the front face of the second heating tube (94) is fixedly mounted on the front inner wall of the other drying chamber (91); and the second heating tube (94) is distributed in parallel with the moving path of the cup bag film inside the other drying chamber (91).

4. The monitoring device for intelligent correction of printed patterns on the surface of cup bags according to claim 3 is characterized in that: The printing device further comprises support blocks (44) fixedly mounted between the opposing surfaces of the first housing (1) and the second housing (2) and symmetrically distributed; the first cylinder (4) is fixedly sleeved in a mounting hole of the support block (44) located on the left side of the first housing (1); the second cylinder (5) is fixedly sleeved in another mounting hole of the support block (44) located on the right side of the first housing (1); one end of the piston rods of the first cylinder (4) and the second cylinder (5) are fixedly mounted with a displacement frame (45) by bolts; the displacement frame (45) located below the first cylinder (4) is fixedly mounted on the piston rods of the first cylinder (4) and the second cylinder (5). The displacement frame (45) is rotatably sleeved on the two ends of the core shaft of the first impression roller (41) through bearings, and the displacement frame (45) located below the second cylinder (5) is rotatably sleeved on the two ends of the core shaft of the second impression roller (51) through bearings. The first shell (1) and the second shell (2) are both provided with cavities (46) inside, and symmetrically distributed lifting grooves (47) are provided between the relative surfaces of the first shell (1) and the second shell (2), and one side inner wall of the lifting groove (47) is connected to the inner wall of the cavity (46).

5. The monitoring device for intelligent correction of printed patterns on the surface of cup bags according to claim 4 is characterized in that: The inner wall of the lifting slide groove (47) is slidably sleeved with a lifting slide plate (48), and the inner wall of the lifting slide plate (48) is rotatably sleeved with a first connecting shaft (49), and the four first connecting shafts (49) are divided into two groups in pairs, and one end of the opposite surface of the first connecting shaft (49) in one group is fixedly installed with the two ends of the core shaft of the first impression roller (41) by bolts, and one end of the opposite surface of the first connecting shaft (49) in the other group is fixedly installed with the two ends of the core shaft of the second impression roller (51) by bolts, and a detachable reinforcement ring group (410) is fixedly installed at the connection between the first connecting shaft (49) and the first impression roller (41) by bolts, and the reinforcement ring is composed of two reinforcement rings; The other end of one of the first connecting shafts (49) in each group is fixedly sleeved with a first gear (411), and the first gear (411) is located inside the cavity (46) in the first shell (1). The other end of the other first connecting shaft (49) in each group extends to the inside of the cavity (46) located in the second shell (2). The front side of the first shell (1) is rotatably sleeved with symmetrically distributed second connecting shafts (412), one end of one of the second connecting shafts (412) is plugged into one end of the core shaft of the first plate roller (42), and one end of the other second connecting shaft (412) is plugged into one end of the core shaft of the second plate roller (52).

6. The monitoring device for intelligent correction of printed patterns on the surface of cup bags according to claim 5, characterized in that: The other ends of the two second connecting shafts (412) extend into the cavity (46) located in the first shell (1) and are fixedly sleeved with a second gear (416) meshing with the first gear (411). A driving motor (413) is fixedly installed on the inner bottom wall of the cavity (46) located in the first shell (1). The output shaft of the driving motor (413) is fixedly connected to the other end of one of the second connecting shafts (412) through a coupling. Adjacent second connecting shafts (412) inside the cavity (46) located in the first shell (1) are connected by a belt transmission mechanism. A symmetrically distributed clamping cylinder (414) is fixedly installed on the inner wall of the cavity (46) located in the second shell (2). The clamping cylinders (414) are arranged on the inner wall of the cavity (46) located in the second shell (2). One end of the piston rod of the cylinder (414) is rotatably sleeved with a third connecting shaft (415), one end of one of the third connecting shafts (415) is plugged into the other end of the core shaft of the first plate roller (42), and one end of the other third connecting shaft (415) is plugged into the other end of the core shaft of the second plate roller (52), and the outer surface of the third connecting shaft (415) is slidably sleeved with the inner wall of the mounting hole of the second shell (2), and a movable ink supply assembly is arranged below the first plate roller (42) and the second plate roller (52), and the ink supply assembly includes an ink supply cylinder (10) fixedly mounted on the ground, and an ink tank (101) is fixedly mounted on the top of the piston rod of the ink supply cylinder (10), and an ink scraping assembly is arranged on the left side of the ink supply assembly; The ink scraping assembly comprises a mounting sleeve (11) fixedly mounted on the ground, a piston sleeve (111) being fixedly sleeved on the inner wall of the mounting sleeve (11), an extrusion rod (112) being threadedly connected to the left inner wall of the piston sleeve (111), a push rod (113) being slidably sleeved on the right inner wall of the piston sleeve (111), and a slot for filling liquid into the piston sleeve (111) being provided on the inner top wall of the piston sleeve (111) between the extrusion rod (112) and the push rod (113). An oil filling port (114) for pressurizing oil, a symmetrically distributed ink scraper (115) for scraping off ink is arranged on the upper left of the outer surface of the first plate roller (42) and the second plate roller (52), a tool mounting frame (116) is fixedly mounted on the outer surface of the ink scraper (115), adjacent tool mounting frames (116) are fixedly mounted via a connecting plate (117), and one end of the push rod (113) is fixedly connected to the left side surface of one of the tool mounting frames (116).

7. The monitoring device for intelligent correction of printed patterns on the surface of cup bags according to claim 6, characterized in that: The compensation device also includes a passive slide groove (53) which is symmetrically distributed and is opened on the relative surfaces of the first shell (1) and the second shell (2). The inner wall of the passive slide groove (53) is slidably sleeved with a passive slider (54). The left inner wall of the passive slide groove (53) is fixedly connected with a spring (55). One end of the spring (55) is fixedly connected to the left surface of the passive slider (54). A guide roller (56) is rotatably sleeved on the inner wall of the mounting hole of the passive slider (54). One end of the relative surface of another group of the first connecting shafts (49) is fixedly sleeved with an extrusion disk (57). The outer surface of the extrusion disk (57) is rotatably sleeved with rotating balls (58) distributed in a ring array. The outer surface of the rotating balls (58) is in rolling contact with the inner wall of the arc-shaped slide groove of the passive slider (54). A symmetrically distributed connecting block (59) is fixedly connected between the relative surfaces of the first shell (1) and the second shell (2).

8. The monitoring device for intelligent correction of printed patterns on the surface of cup bags according to claim 7, characterized in that: The information collection unit (6) comprises a first high-resolution camera (61) and a second high-resolution camera (62), wherein the first high-resolution camera (61) is fixedly mounted at the center of the upper left surface of one of the connection blocks (59) which is parallel to the moving path of the cup bag film, and the first high-resolution camera (61) is located between the printing device and the compensation device, and the second high-resolution camera (62) is fixedly mounted at the center of the upper left surface of another connection block (59) which is parallel to the moving path of the cup bag film, and the second high-resolution camera (62) is located on the right side of the compensation device, wherein: The first high-resolution camera (61) performs real-time visual inspection and preprocessing of the printed pattern on the surface of the cup bag film after printing by the printing device, including time-stamping the image data collected in real time by the first high-resolution camera (61), thereby establishing a cup bag film inspection data set with a time-stamp.

9. The monitoring device for intelligent correction of printed patterns on the surface of cup bags according to claim 8, characterized in that: The analysis and processing unit (7) comprises a database (71), wherein: The cup bag film detection data set with the time stamp is sent to the analysis and processing unit (7) for processing, and the processing process includes: firstly processing the data in time sequence, performing image correction and denoising; Secondly, the Sobel operator of edge detection is used to extract the horizontal and vertical edge features of the printed pattern on the surface of the processed cup bag, and the Harris corner detection is used to extract the corner points and intersections of the printed pattern on the surface of the processed cup bag. The gray level co-occurrence matrix is ​​used to extract its texture features. Subsequently, the expected design pattern pre-stored in the total number of pixels represented by the database (71) is called, and the actual printed pattern is matched with the expected design pattern pixel by pixel. The matching degree is calculated using the mean square error. The specific calculation formula is: Among them, I actual (i) and I expected (i) represents the pixel values ​​of the actual printed pattern and the expected design pattern, respectively, and N represents the total number of pixels; After the analysis and processing unit (7) obtains the calculation result of MSE, it is determined whether the matching degree between the actual printed pattern and the expected design pattern exceeds a corresponding threshold value. Specifically, if MSE=0, it means that the actual printed pattern completely matches the design pattern; if 0<MSE<10, it means that there are some acceptable differences between the actual printed pattern and the expected design pattern; if MSE>10, it means that the error is large and the matching degree is low, and the printed pattern is unqualified and needs to be reprinted; After determining that the printed pattern needs to be reprinted, the starting time of the re-covering printing of the unqualified printed pattern by the compensation device is calculated based on the moving path of the unqualified printed pattern and the timestamp of the information acquisition unit (6) detecting the unqualified printed pattern. The specific calculation formula is: T represents the start time of the compensation device to re-cover the unqualified pattern, d represents the distance between the printing area of ​​the printing device and the printing area of ​​the compensation device, v represents the moving speed of the cup bag film, t 补偿时间 It indicates the time taken by the information acquisition unit (6) to analyze and process the printed pattern after detecting the printed pattern.

10. The monitoring device for intelligent correction of printed patterns on the surface of cup bags according to claim 9, characterized in that: Based on the start time of re-printing of the unqualified pattern by the compensation device calculated by the analysis and processing unit (7), a real-time control instruction is formed by the control unit (8); Within the pressure range recommended by the gravure printing equipment, the printing device gradually adjusts the printing pressure by increasing it by 1-2 units each time. The compensating device adjusts the printing pressure by adding 1-2 units to the original printing pressure of the printing device for the first compensation. Each subsequent compensation gradually adjusts the printing pressure by increasing it by 1-2 units each time. The adjusted compensating device re-prints the overprinted pattern. After the printing is completed, the second high-resolution camera (62) of the information collection unit (6) monitors the overprinted pattern and feeds the monitoring data back to the analysis and processing unit (7). The analysis and processing unit (7) calculates the matching degree between the overprinted pattern and the expected design pattern to determine whether it is necessary to further adjust the printing pressure of the compensating device and the printing device.

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