Environment-friendly printing system for plate cylinder

Abstract

The invention provides an environment-friendly printing system for a plate cylinder. The environment-friendly printing system aims at solving the problems that in the prior art, installation, fixing and cleaning are complex, and the printing quality is affected due to loosening or abrasion of a printing plate. The printing machine comprises a rack (1), a plate cylinder (2), a cleaning device (3), a control system (4) and an environment-friendly treatment device (5). Wherein the printing plate cylinder (2) fixes a printing plate through a buckle (22) and a positioning block (23), the cleaning device (3) is provided with a nozzle (311) and a scraper (312), and printing ink and impurities are automatically removed. The control system (4) monitors and commands cleaning operation in real time, and the environment-friendly treatment device (5) filters and treats waste liquid to ensure that emission reaches the standard. The design improves the equipment efficiency and prolongs the service life, and meets the environmental protection requirement.

Description

Technical Field

[0001] The present invention belongs to the technical field of printing machinery, and specifically relates to an environment-friendly printing system for a plate cylinder. Background Art

[0002] With the continuous development of plate cylinders and the field, existing plate cylinder products have been widely used. However, there are still some problems in their actual use. For example, existing plate cylinders usually have complex operations when installing and fixing the printing plate, and the printing plate is prone to loosening or wear after long-term use, resulting in a decline in printing quality. In addition, existing plate cylinders have deficiencies in cleaning, and cannot effectively remove the ink and impurities on the surface of the cylinder, affecting the printing effect and the service life of the equipment.

[0003] To solve these problems, there have been some attempts, such as improving the structural design and installation method of the plate cylinder. Although these methods have improved the relevant aspects to a certain extent, they still have limitations. For example, manual intervention is still required in cleaning and maintenance, with low efficiency and easy to cause environmental pollution.

[0004] Specifically, after retrieval, a plate cylinder with the publication number CN107206780B was disclosed, and the publication date was August 2, 2019. This design adopts the structure of a plate cylinder main body, a flat part, a hole part, and a plate fixing component. Although it can achieve the tight fixation of the printing plate, due to its complex structure, the operation is cumbersome when installing and disassembling the printing plate, and the fixing component is prone to wear after long-term use, resulting in the loosening of the printing plate. In addition, this design does not involve the cleaning function of the cylinder, and cannot effectively remove the ink and impurities on the surface of the cylinder, affecting the printing quality and the service life of the equipment.

[0005] After retrieval, a plate cylinder of a PS plate printing machine with the publication number CN106965551B was disclosed, and the publication date was June 17, 2022. This product adopts a plate head loose clamping device, a plate tail loose clamping device, and a plate tensioning device. Although it can achieve the rapid installation and adjustment of the printing plate, due to its reliance on a cylinder to push the block, the structure is complex and the maintenance cost is high. In addition, this design also does not involve the cleaning function of the cylinder, and cannot effectively remove the ink and impurities on the surface of the cylinder, affecting the printing effect and the service life of the equipment.

[0006] The above problems indicate that it is difficult for existing plate cylinders on the market to effectively meet the new requirements for efficient installation, fixation, and cleaning under complex working conditions. Therefore, the present invention provides an environment-friendly printing system for a plate cylinder to overcome these deficiencies and provide a new solution that is more intelligent, efficient, and adaptable to changing environments. This design can not only achieve the rapid installation and fixation of the printing plate, but also automatically clean the surface of the cylinder, improve the printing quality and the service life of the equipment, and reduce environmental pollution. Summary of the Invention

[0007] The present invention provides an environment-friendly printing system for a printing plate cylinder, which solves the problems existing in the installation, fixation, and cleaning of existing printing plate cylinder products, such as complex operations, decreased printing quality due to loose or worn printing plates, inability to effectively remove ink and impurities on the surface of the cylinder, affecting the printing effect and the service life of the equipment, and low efficiency and environmental pollution caused by manual intervention in cleaning and maintenance. The present invention aims to provide a more intelligent, efficient, and adaptable new solution to effectively improve the printing quality and the service life of the equipment and reduce environmental pollution.

[0008] The technical solution adopted by the present invention to solve the above technical problems is: an environment-friendly printing system for a printing plate cylinder, comprising a frame, a printing plate cylinder, a cleaning device, a control system, and an environmental protection treatment device. The printing plate cylinder is installed on the frame, and a detachable printing plate is provided on the surface of the cylinder; the cleaning device includes a cleaning head, a cleaning liquid supply device, a cleaning liquid recovery device, and a driving mechanism. The cleaning head is arranged above and below the printing plate cylinder. The cleaning liquid supply device is connected to the cleaning head. The cleaning liquid recovery device is arranged at the bottom of the frame. The driving mechanism drives the cleaning head to move along the axial direction of the printing plate cylinder; the control system includes a central processor, a sensor module, and a signal transceiver. The central processor is connected to the cleaning device and the environmental protection treatment device through the signal transceiver. The sensor module is used to detect the working state of the printing plate cylinder; the environmental protection treatment device includes a filter and a waste liquid treatment unit. The filter is arranged at the outlet of the cleaning liquid recovery device, and the waste liquid treatment unit is used to treat the recovered cleaning liquid to meet the discharge standard.

[0009] The printing plate cylinder includes a cylinder body and a printing plate fixing device. The cylinder body is of a cylindrical structure. The printing plate fixing device includes a plurality of buckles, which are evenly distributed on the outer surface of the cylinder body. The printing plate is fixed on the cylinder body through the buckles. The printing plate fixing device further includes printing plate positioning blocks, which are installed at both ends of the cylinder body to ensure the accurate position of the printing plate on the cylinder.

[0010] The cleaning head includes a nozzle and a scraper. The nozzle is used to spray the cleaning liquid, and the scraper is used to scrape off the ink and impurities on the surface of the cylinder. The nozzle and the scraper are fixed on the driving mechanism through a bracket. The bracket can move along the axial direction of the cylinder to ensure that the cleaning head can cover the entire surface of the cylinder. The distance between the nozzle and the scraper is adjustable and is adjusted according to the thickness of the ink and impurities on the surface of the cylinder to ensure the cleaning effect.

[0011] The cleaning liquid supply device includes a cleaning liquid storage tank, a pump, and pipelines. The cleaning liquid storage tank is arranged at the upper part of the frame. The pump is connected to the cleaning head through pipelines and is used to transport the cleaning liquid to the nozzle. The cleaning liquid recovery device includes a recovery tank and a pump. The recovery tank is arranged at the bottom of the frame and is used to collect the cleaning liquid dripping from the surface of the drum. The pump transports the recovered cleaning liquid to the filter through pipelines for treatment. The filter includes multiple layers of filter meshes and an activated carbon filter layer and is used to remove the ink and impurities in the cleaning liquid.

[0012] In the control system, the central processor is connected to the sensor module through a data bus and is used to collect the working state data of the drum and judge whether the drum needs to be cleaned according to a preset algorithm. The signal transceiver is connected to the central processor and is used to receive and send command signals. The sensor module includes a temperature sensor, a pressure sensor, and a position sensor. The temperature sensor is used to detect the temperature of the drum surface, the pressure sensor is used to detect the load of the drum, and the position sensor is used to detect the position of the printing plate on the drum.

[0013] In the environmental protection treatment device, the filter is connected to the outlet of the cleaning liquid recovery device through pipelines. The waste liquid treatment unit includes a chemical treatment tank and a biological treatment tank. The chemical treatment tank is used to neutralize the harmful substances in the cleaning liquid, and the biological treatment tank is used to decompose the organic substances in the cleaning liquid. The filter layer of the filter is replaced regularly to ensure its filtering effect. The liquid treated by the waste liquid treatment unit is discharged after reaching the national discharge standard.

[0014] The structural composition, implementation method, and operation principle of the present invention are as follows:

[0015] Structure of the printing plate drum: The printing plate is fixed on the drum body through a buckle, and the printing plate positioning block ensures the accurate position of the printing plate on the drum. When the printing plate needs to be replaced, the printing plate can be easily disassembled by loosening the buckle. When installing a new printing plate, the printing plate is fixed through the buckle to ensure the tight fit of the printing plate on the drum.

[0016] Structure and operation of the cleaning device: The cleaning head includes a nozzle and a scraper. The nozzle sprays the cleaning liquid, and the scraper scrapes off the ink and impurities on the surface of the drum. The driving mechanism drives the cleaning head to move axially along the drum to ensure that the cleaning head can cover the entire surface of the drum. When the central processor judges that the drum needs to be cleaned, it sends a command to the pump through the signal transceiver. The pump transports the cleaning liquid from the storage tank to the nozzle. The nozzle sprays the cleaning liquid, and the scraper scrapes off the ink and impurities on the surface of the drum. The cleaned liquid drips into the recovery tank and is transported to the filter through the pump for treatment. The multiple layers of filter meshes and the activated carbon filter layer of the filter remove the ink and impurities in the cleaning liquid. The treated cleaning liquid is discharged or recycled after reaching a certain standard.

[0017] Structure and Operation of the Control System: The central processing unit is connected to the sensor module through the data bus. The sensor module collects the working state data of the drum in real time, including temperature, pressure, and position information. The central processing unit determines whether the drum needs to be cleaned according to the preset algorithm. When it is determined that cleaning is required, an instruction is sent to the cleaning device through the signal transceiver to start the cleaning process. The signal transceiver is also used to receive the real-time data from the sensor module and feedback it to the central processing unit to ensure the accurate control of the cleaning process.

[0018] Structure and Operation of the Environmental Protection Treatment Device: The filter is connected to the outlet of the cleaning liquid recovery device through a pipeline. The waste liquid treatment unit includes a chemical treatment tank and a biological treatment tank. The multi-layer filter screen and activated carbon filter layer of the filter remove the ink and impurities in the cleaning liquid. The harmful substances in the cleaning liquid are neutralized in the chemical treatment tank, and the organic substances in the cleaning liquid are decomposed in the biological treatment tank. The filter layer of the filter is replaced regularly to ensure its filtering effect. The liquid treated by the waste liquid treatment unit is discharged after reaching the national discharge standard, reducing environmental pollution.

[0019] Advantages of the Present Invention:

[0020] 1. The cleaning head of the cleaning device of the present invention can automatically move along the axial direction of the drum. The combined use of the nozzle and the scraper can effectively remove the ink and impurities on the surface of the drum, improve the cleaning efficiency and cleaning effect, and ensure the stability of the printing quality and the long service life of the equipment.

[0021] 2. Through the design of the buckle and the printing plate positioning block, the printing plate cylinder of the present invention realizes the rapid installation and fixation of the printing plate, reduces the operation complexity and the risk of printing plate loosening or wear, and improves the operation efficiency and printing quality of the printing machine.

[0022] 3. The environmental protection treatment device of the present invention filters and treats the cleaning liquid to ensure that the cleaning liquid is discharged after reaching the national discharge standard, reducing environmental pollution and meeting the environmental protection requirements. Description of the Drawings

[0023] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0024] Figure 1 is the overall structure schematic diagram of the present invention;

[0025] Figure 2 is the structure schematic diagram of the printing plate cylinder of the present invention;

[0026] Figure 3 is the structure schematic diagram of the cleaning device of the present invention;

[0027] Figure 4 is the structure schematic diagram of the cleaning liquid supply device of the present invention;

[0028] Figure 5 is a schematic structural diagram of the cleaning liquid recovery device of the present invention;

[0029] Figure 6 is a schematic block diagram of the control system of the present invention.

[0030] In the figure: 1, frame; 2, plate cylinder; 21, cylinder body; 22, buckle; 23, plate positioning block; 3, cleaning device; 31, cleaning head; 311, nozzle; 312, scraper; 313, bracket; 32, cleaning liquid supply device; 321, cleaning liquid storage tank; 322, pump; 323, pipeline; 33, cleaning liquid recovery device; 331, recovery tank; 332, pump; 34, driving mechanism; 4, control system; 41, central processing unit; 42, sensor module; 421, temperature sensor; 422, pressure sensor; 423, position sensor; 43, signal transceiver; 5, environmental protection treatment device; 51, filter; 511, multi-layer filter screen; 512, activated carbon filter layer; 52, waste liquid treatment unit; 521, chemical treatment pool; 522, biological treatment pool. Detailed implementation manners

[0031] In order to enable those skilled in the art of the present technology to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0032] It should be noted that if the terms "first", "second", etc. are involved in the description and claims of the present application and the above-mentioned drawings, they are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of the present application described herein. In addition, if the terms "including" and "having" and any variations thereof are involved, the intention is to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0033] In this application, if terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. are involved, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated devices, elements, or components must have a specific orientation, or be constructed and operated in a specific orientation.

[0034] Moreover, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0035] In addition, in this application, if terms such as "installed", "set up", "provided with", "connected", "linked", "socketed", etc. are involved, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will refer to the drawings and combine with embodiments to detail this application.

[0037] An embodiment of the present invention provides an environment-friendly printing system for a printing plate cylinder, which solves the problems existing in existing printing plate cylinder products, such as complex operations in installation, fixation, and cleaning, decreased printing quality caused by loose or worn printing plates, inability to effectively remove ink and impurities on the surface of the cylinder, affecting the printing effect and the service life of the equipment, and the inefficiency and easy environmental pollution caused by manual intervention in cleaning and maintenance.

[0038] To better understand the above technical solution, the following will detail the above technical solution in combination with the specification drawings and specific implementation manners.

[0039] Refer to Figures 1 to 6 , an environment-friendly printing system for a printing plate cylinder, includes a frame 1, a printing plate cylinder 2, a cleaning device 3, a control system 4, and an environmental protection treatment device 5.

[0040] In this embodiment, the frame 1 is the support structure of the entire printing press, used to fix and support other components. The upper part of the frame 1 is provided with a plate cylinder 2, and the lower part is provided with a cleaning liquid recovery device 33 and an environmental protection treatment device 5.

[0041] In this embodiment, the plate cylinder 2 includes a cylinder body 21, a buckle 22, and a plate positioning block 23. The cylinder body 21 is a cylindrical structure, and a plurality of evenly distributed buckles 22 are provided on the surface for fixing the printing plate. The plate positioning blocks 23 are installed at both ends of the cylinder body 21 to ensure the accurate position of the printing plate on the cylinder. When the printing plate needs to be replaced, the printing plate can be easily disassembled by loosening the buckle 22. When installing a new printing plate, the printing plate is fixed by the buckle 22 to ensure a tight fit of the printing plate on the cylinder.

[0042] In this embodiment, the cleaning device 3 includes a cleaning head 31, a cleaning liquid supply device 32, a cleaning liquid recovery device 33, and a driving mechanism 34.

[0043] In this embodiment, the cleaning head 31 includes a nozzle 311 and a scraper 312. The nozzle 311 is used to spray the cleaning liquid, and the scraper 312 is used to scrape off the ink and impurities on the surface of the cylinder. The nozzle 311 and the scraper 312 are fixed on the driving mechanism 34 through a bracket 313. The bracket 313 can move along the axial direction of the cylinder to ensure that the cleaning head 31 can cover the entire surface of the cylinder. The distance between the nozzle 311 and the scraper 312 is adjustable and can be adjusted according to the thickness of the ink and impurities on the surface of the cylinder to ensure the cleaning effect.

[0044] In this embodiment, the scraper 312 is provided with through holes. After installation, the nozzle 311 passes through the scraper 312, and the nozzle 311 is located directly below the cylinder body 21. The shape of the scraper 312 is larger at the top and smaller at the bottom. The lower end of the scraper 312 is located above the recovery tank 331, and a plurality of drainage grooves are provided on the surface of the scraper 312, so that the cleaning liquid can flow down the surface of the scraper 312 into the recovery tank 331.

[0045] In this embodiment, the cleaning liquid supply device 32 includes a cleaning liquid storage tank 321, a pump 322, and a pipeline 323. The cleaning liquid storage tank 321 is arranged at the upper part of the frame 1. The pump 322 is connected to the cleaning head 31 through the pipeline 323 for delivering the cleaning liquid to the nozzle 311.

[0046] In this embodiment, the cleaning liquid recovery device 33 includes a recovery tank 331 and a pump 332. The recovery tank 331 is arranged at the bottom of the frame 1 for collecting the cleaning liquid dripping from the surface of the cylinder. The pump 332 delivers the recovered cleaning liquid to the filter 51 through a pipeline for treatment.

[0047] In this embodiment, the driving mechanism 34 is used to drive the cleaning head 31 to move along the axial direction of the cylinder to ensure that the cleaning head 31 can cover the entire surface of the cylinder.

[0048] In this embodiment, the control system 4 includes a central processing unit 41, a sensor module 42, and a signal transceiver 43.

[0049] In this embodiment, the central processing unit 41 is connected to the sensor module 42 via a data bus, and is used to collect the operating state data of the drum, and determine whether the drum needs to be cleaned according to a preset algorithm.

[0050] In this embodiment, the sensor module 42 includes a temperature sensor 421, a pressure sensor 422, and a position sensor 423. The temperature sensor 421 is used to detect the temperature of the drum surface, the pressure sensor 422 is used to detect the load of the drum, and the position sensor 423 is used to detect the position of the printing plate on the drum.

[0051] In this embodiment, the signal transceiver 43 is connected to the central processing unit 41 and is used to receive and send command signals. When the central processing unit 41 determines that the drum needs to be cleaned, it sends a command to the pump 322 through the signal transceiver 43 to start the cleaning process.

[0052] In this embodiment, the environmental protection treatment device 5 includes a filter 51 and a waste liquid treatment unit 52.

[0053] In this embodiment, the filter 51 is connected to the outlet of the cleaning liquid recovery device 33 through a pipeline. The filter 51 includes multiple layers of filter meshes 511 and an activated carbon filter layer 512, and is used to remove ink and impurities in the cleaning liquid.

[0054] In this embodiment, the waste liquid treatment unit 52 includes a chemical treatment tank 521 and a biological treatment tank 522. The chemical treatment tank 521 is used to neutralize harmful substances in the cleaning liquid, and the biological treatment tank 522 is used to decompose organic substances in the cleaning liquid. The filter layer of the filter 51 is replaced regularly to ensure its filtering effect. The liquid treated by the waste liquid treatment unit 52 is discharged after reaching the national discharge standard.

[0055] In this embodiment, a pump is also provided between the chemical treatment tank 521 and the biological treatment tank 522. When the treatment in the chemical treatment tank 521 is completed, the pump is turned on to pump the waste liquid in the chemical treatment tank 521 into the biological treatment tank 522 for treatment.

[0056] In this embodiment, the machine learning algorithm module adopts a reinforcement learning framework and defines a reward function: R = α · cleanliness + β · water consumption^(-1)+γ · time^(-1);

[0057] The reinforcement learning framework of this system constructs a multi-dimensional evaluation system and realizes optimal decision-making through a three-factor dynamic balance mechanism:

[0058] Cleanliness dominant factor: Use high-precision optical sensors to collect real-time data on the percentage of residue area on the drum surface, and calculate the cleanliness index through image segmentation algorithms. 2 The cleanliness penalty mechanism is triggered, driving the algorithm to increase the cleaning intensity;

[0059] Water consumption suppression factor: A flow metering chip is implanted in the nozzle pressure control module, and a water consumption model under different spray angles is established in combination with historical data. The system uses a gradient penalty mechanism to automatically trigger a water-saving strategy when the water consumption of a single cleaning exceeds the average value of similar working conditions by 15%;

[0060] Time efficiency factor: A millisecond-level time stamp recording device is integrated into the drive mechanism to accurately calculate the time taken for the entire process from the issuance of the cleaning instruction to the completion of the surface drying. The system sets a dynamic time threshold and starts the acceleration program when the operation time exceeds the preset baseline;

[0061] The Q-learning algorithm was used to achieve parameter self-optimization during 100 consecutive cleaning cycles.

[0062] The system builds a hierarchical reinforcement learning architecture and achieves intelligent evolution through four-stage iterations:

[0063] State space modeling: The drum surface is divided into 200×200 grid monitoring units. Each unit records 12-dimensional feature vectors such as ink thickness, residue type, temperature gradient, etc., forming a million-level state node library;

[0064] Action strategy generation: define continuous action spaces such as nozzle pressure (adjustable from 0.2 to 0.8 MPa), scraper spacing (0.1 to 0.5 mm), and moving speed (5 to 30 cm / s), and balance exploration and utilization through the ε-greedy strategy;

[0065] Online experience playback: Deploy edge computing units in the cleaning arm to build a memory library containing 10,000 sets of historical operations. Extract 500 sets of experience samples after each cleaning to update the Q value table to achieve cross-cycle knowledge transfer;

[0066] Policy network optimization: Using a dual-Q network architecture, the main network is responsible for immediate decision-making, and the target network is updated lazily. Network parameter synchronization is performed every 20 cleaning cycles to prevent overfitting.

[0067] Operating principle and operation process

[0068] 1. The installation and fixing process of the plate cylinder is as follows:

[0069] When the printing plate needs to be replaced, the printing plate can be easily disassembled by loosening the buckle 22. When a new printing plate is installed, the printing plate is fixed by the buckle 22, and the printing plate positioning block 23 is used to ensure the accurate position of the printing plate on the cylinder.

[0070] 2. The operation process of the cleaning device is as follows:

[0071] When the central processor 41 detects through the sensor module 42 that the drum needs to be cleaned, it sends an instruction to the pump 322 through the signal transceiver 43. The pump 322 transports the cleaning liquid from the storage tank 321 to the nozzle 311. The nozzle 311 sprays the cleaning liquid, and the scraper 312 scrapes off the ink and impurities on the surface of the drum. The driving mechanism 34 drives the cleaning head 31 to move along the axial direction of the drum to ensure that the cleaning head 31 can cover the entire surface of the drum. The cleaned liquid drips into the recovery tank 331 and is transported to the filter 51 for treatment through the pump 332.

[0072] 3. The operation process of the control system is as follows:

[0073] The central processor 41 is connected to the sensor module 42 through the data bus to collect the working state data of the drum in real time. It judges whether the drum needs to be cleaned according to the preset algorithm. When it is judged that cleaning is required, an instruction is sent to the cleaning device through the signal transceiver 43 to start the cleaning process. The signal transceiver 43 is also used to receive the real-time data of the sensor module 42 and feedback it to the central processor 41 to ensure the accurate control of the cleaning process.

[0074] 4. The operation process of the environmental protection treatment device is as follows:

[0075] The filter 51 is connected to the outlet of the cleaning liquid recovery device 33 through a pipeline. The multi-layer filter screen 511 and the activated carbon filter layer 512 of the filter 51 remove the ink and impurities in the cleaning liquid. The chemical treatment tank 521 neutralizes the harmful substances in the cleaning liquid, and the biological treatment tank 522 decomposes the organic substances in the cleaning liquid. The filter layer of the filter 51 is replaced regularly to ensure its filtering effect. The liquid treated by the waste liquid treatment unit 52 is discharged after reaching the national discharge standard.

[0076] 5. The specific application scenarios are as follows:

[0077] Suppose that the environment-friendly printing press with plate cylinder cleaning of the present invention is used for printing operations in a printing factory. During the printing process, the control system 4 monitors the working state of the plate cylinder in real time through the sensor module 42. When it is detected that there is ink and impurities accumulating on the surface of the cylinder, the central processing unit 41 sends an instruction to the pump 322 through the signal transceiver 43 to start the cleaning process. The pump 322 conveys the cleaning liquid from the storage tank 321 to the nozzle 311, the nozzle 311 sprays the cleaning liquid, and the squeegee 312 scrapes off the ink and impurities on the surface of the cylinder. The driving mechanism 34 drives the cleaning head 31 to move along the axial direction of the cylinder to ensure that the cleaning head 31 can cover the entire surface of the cylinder. The cleaned liquid drips into the recovery tank 331 and is conveyed to the filter 51 through the pump 332 for treatment. The multi-layer filter screen 511 and the activated carbon filter layer 512 of the filter 51 remove the ink and impurities in the cleaning liquid. The chemical treatment tank 521 neutralizes the harmful substances in the cleaning liquid, and the biological treatment tank 522 decomposes the organic substances in the cleaning liquid. The filter layer of the filter 51 is replaced regularly to ensure its filtering effect. The liquid after being treated by the waste liquid treatment unit 52 is discharged after meeting the national discharge standards.

[0078] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and the descriptions in the specification are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and all these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly printing system for a printing plate cylinder, comprising a frame (1), a printing plate cylinder (2), a cleaning device (3), a control system (4) and an environmentally friendly treatment device (5), characterized in that: The printing plate cylinder (2) is mounted on the frame (1), and a detachable printing plate is provided on the surface of the cylinder; The cleaning device (3) comprises a cleaning head (31), a cleaning liquid supply device (32), a cleaning liquid recovery device (33) and a driving mechanism (34); the cleaning head (31) is arranged above and below the printing plate cylinder (2); the cleaning liquid supply device (32) is connected to the cleaning head (31); the cleaning liquid recovery device (33) is arranged at the bottom of the frame (1); and the driving mechanism (34) drives the cleaning head (31) to move axially along the printing plate cylinder (2); The control system (4) comprises a central processing unit (41), a sensor module (42) and a signal transceiver (43). The control system (4) further integrates a machine learning algorithm module and a digital twin model, and optimizes cleaning parameters in real time by fusion data of multiple sensors. The central processing unit (41) is connected to the cleaning device (3) and the environmental protection treatment device (5) via the signal transceiver (43). The sensor module (42) is used to detect the working state of the plate cylinder (2). The environmental treatment device (5) comprises a filter (51) and a waste liquid treatment unit (52), wherein the filter (51) is arranged at the outlet of the cleaning liquid recovery device (33), and the waste liquid treatment unit (52) is used to treat the recovered cleaning liquid so that it meets the discharge standard; The machine learning algorithm module dynamically adjusts the matching relationship between the nozzle pressure and the scraper gap according to the historical cleaning data and the drum surface image characteristics; The digital twin model (45) constructs a virtual mapping of the roller surface morphology through 3D point cloud scanning and predicts the cleaning path of the ink residue area.

2. An environmentally friendly printing system for a printing plate cylinder according to claim 1, characterized in that: The printing plate cylinder (2) comprises a cylinder body (21) and a printing plate fixing device, the cylinder body (21) is a cylindrical structure, the printing plate fixing device comprises a plurality of buckles (22), the buckles (22) are evenly distributed on the outer surface of the cylinder body (21), and the printing plate is fixed to the cylinder body (21) by the buckles (22).

3. An environmentally friendly printing system for a printing plate cylinder according to claim 2, characterized in that: The printing plate fixing device also includes a printing plate positioning block (23), which is installed at both ends of the roller body (21) to ensure the accurate position of the printing plate on the roller.

4. The environmentally friendly printing system for a printing plate cylinder according to claim 1, characterized in that: The cleaning head (31) comprises a nozzle (311) and a scraper (312); the nozzle (311) is used to spray cleaning liquid, and the scraper (312) is used to scrape off ink and impurities on the surface of the roller; the nozzle (311) and the scraper (312) are fixed to a driving mechanism (34) via a bracket (313); the bracket (313) can move along the axial direction of the roller to ensure that the cleaning head (31) can cover the entire surface of the roller.

5. The environmentally friendly printing system for a printing plate cylinder according to claim 1, characterized in that: The machine learning algorithm module adopts a reinforcement learning framework and defines a reward function: R = α·cleanliness+β·water consumption-1+γ·time-1; And the Q-learning algorithm is used to achieve parameter self-optimization within 100 consecutive cleaning cycles.

6. The environmentally friendly printing system for a printing plate cylinder according to claim 1, characterized in that: The cleaning liquid supply device (32) comprises a cleaning liquid storage tank (321), a pump (322) and a pipeline (323); the cleaning liquid storage tank (321) is arranged on the upper part of the frame (1); the pump (322) is connected to the cleaning head (31) through the pipeline (323) and is used to transport the cleaning liquid to the nozzle (311).

7. The environmentally friendly printing system for a printing plate cylinder according to claim 1, characterized in that: The cleaning liquid recovery device (33) comprises a recovery tank (331) and a pump (332); the recovery tank (331) is arranged at the bottom of the frame (1) and is used to collect the cleaning liquid dripping from the surface of the drum; the pump (332) transports the recovered cleaning liquid to the filter (51) through a pipeline for treatment.

8. The environmentally friendly printing system for a printing plate cylinder according to claim 1, characterized in that: In the control system (4), the central processing unit (41) is connected to the sensor module (42) via a data bus, and is used to collect the working status data of the drum and determine whether the drum needs to be cleaned according to a preset algorithm. The signal transceiver (43) is connected to the central processing unit (41) and is used to receive and send command signals.

9. An environmentally friendly printing system for a printing plate cylinder according to claim 8, characterized in that: The sensor module (42) comprises a temperature sensor (421), a pressure sensor (422) and a position sensor (423); the temperature sensor (421) is used to detect the temperature of the surface of the roller; the pressure sensor (422) is used to detect the load of the roller; and the position sensor (423) is used to detect the position of the printing plate on the roller.

10. The environmentally friendly printing system for a printing plate cylinder according to claim 1, characterized in that: In the environmental treatment device (5), the filter (51) is connected to the outlet of the cleaning liquid recovery device (33) through a pipeline, the filter (51) includes a multi-layer filter screen (511) and an activated carbon filter layer (512), and the waste liquid treatment unit (52) includes a chemical treatment tank (521) and a biological treatment tank (522), the chemical treatment tank (521) is used to neutralize harmful substances in the cleaning liquid, and the biological treatment tank (522) is used to decompose organic matter in the cleaning liquid.

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