Satellite type multi-process integrated digital printing device and printing method

Abstract

The invention provides a satellite type multi-process integrated digital printing device and method, and relates to the technical field of printing device.The printing device comprises a constant-temperature large roller, a first conveying roller and a second conveying roller are symmetrically arranged on the two sides of the constant-temperature large roller, and multi-process operation mechanisms are positioned and installed with the constant-temperature large roller as the reference; a printing base material is guided in through the first conveying roller, extends along the outer cylindrical surface of the constant-temperature large roller and then is guided out through the second conveying roller, and the first conveying roller, the second conveying roller and the constant-temperature large roller act synergistically, so that the printing base material is kept in a tensioned state and is tightly attached to the outer surface of the constant-temperature large roller. According to the invention, the multi-process operation mechanism is positioned and mounted by taking the constant-temperature large roller as a unified reference, and the first conveying roller, the second conveying roller and the constant-temperature large roller cooperate to enable the base material to be tensioned and attached, so that the problem of poor registration precision caused by the fact that traditional equipment has no unified positioning reference in multiple processes is solved, and the transmission vibration of the base material is inhibited; and the coating uniformity is improved.

Description

Technical Field

[0001] This invention relates to the field of printing equipment technology, and in particular to a satellite-type multi-process integrated digital printing device and printing method. Background Technology

[0002] With the iterative upgrades of digital information technology and the continuous growth of personalized and customized demands in the printing market, digital printing technology, with its high efficiency, flexibility, and on-demand production characteristics, has become the core development direction in the printing equipment field. However, existing traditional digital printing equipment generally suffers from systemic technical shortcomings, making it difficult to adapt to the demands of high-quality and highly adaptable printing production. Specific deficiencies are as follows: Firstly, the integration of processes is low. Core printing processes such as pre-coating, digital inkjet printing, and varnishing rely on multiple independent machines to complete. Each process unit lacks a unified positioning benchmark and collaborative operation benchmark, resulting in insufficient printing registration control accuracy. Problems such as printing registration deviation, and misalignment between the pre-coating and varnishing processes and the printed graphics are prominent, leading to a high defect rate of finished products. Secondly, the substrate transfer stability is poor. During the multi-process transfer of the printing substrate, it is prone to shaking and offset, which not only results in poor dot reproduction of the printed pattern, but also easily leads to a decrease in the coating uniformity of the pre-coated medium and the varnish coating, directly affecting the appearance quality of the printed products. Third, the substrate temperature control adaptability is poor. The temperature of the printing substrate is easily affected by the external working environment. Temperature fluctuations of different substrate materials during the printing process will have a direct adverse effect on the curing and forming of printing ink and the coating adhesion effect. The equipment has strict requirements for the temperature and humidity conditions of the working environment and has limited overall environmental adaptability. Fourth, the equipment lacks process flexibility, and its operation functions are fixed and singular. It cannot flexibly add, reduce, or adjust the operation procedures according to the actual printing process requirements, making it difficult to adapt to the flexible printing production needs of small batches, multiple categories, and customization.

[0003] The aforementioned common technological bottlenecks in the industry severely restrict the printing accuracy, production efficiency, and application scenario expansion of digital printing equipment, failing to meet the core demands of high-end printing fields for high-quality, highly adaptable, and highly intelligent production. Therefore, the development of highly integrated, high-precision, and adaptive digital printing equipment has become a pressing technical problem for the printing industry. Summary of the Invention

[0004] The present invention provides a satellite-type multi-process integrated digital printing apparatus and printing method to solve at least one of the technical problems mentioned in the background art.

[0005] To address the aforementioned technical problems, this invention discloses a satellite-type multi-process integrated digital printing device, comprising: a constant-temperature large roller, a first conveyor roller, a second conveyor roller, and a multi-process operating mechanism. The first and second conveyor rollers are symmetrically arranged on both sides of the constant-temperature large roller. The multi-process operating mechanism is arranged sequentially along the outer circumferential surface of the constant-temperature large roller, and all multi-process operating mechanisms are positioned and installed with the constant-temperature large roller as a reference. The multi-process operating mechanism includes a pre-coating mechanism, a first drying mechanism, a digital printing mechanism, an inter-group drying mechanism, a varnishing mechanism, and a second drying mechanism. The printing substrate is introduced through the first conveyor roller, extends along the outer cylindrical surface of the constant-temperature large roller, and is then discharged through the second conveyor roller. The first and second conveyor rollers work together with the constant-temperature large roller to keep the printing substrate taut and tightly adhered to the outer surface of the constant-temperature large roller. A tension adjustment component is provided below the constant-temperature large roller to adjust the position of the first and second conveyor rollers, thereby adjusting the tension of the printing substrate.

[0006] Preferably, the digital printing mechanism includes several printing nozzle groups, which are arranged sequentially along the circumference of the constant temperature roller, and the printing end of each printing nozzle group is perpendicular to the surface of the constant temperature roller.

[0007] Preferably, there are multiple inter-group drying mechanisms, and the multiple inter-group drying mechanisms are arranged in a one-to-one correspondence with the printing nozzle group; each inter-group drying mechanism is located on the side of the corresponding printing nozzle group facing the second conveyor roller, and the drying operation end of the inter-group drying mechanism faces the printing substrate bonding area on the outer surface of the constant temperature large roller.

[0008] Preferably, the thermostatic drum includes an inner cylinder and an outer cylinder arranged coaxially. The outer cylinder is fixedly sleeved on the outside of the inner cylinder. The inner wall of the inner cylinder has a spiral flow channel that extends along the axial direction of the inner cylinder. Both ends of the spiral flow channel have fluid communication ports. The spindle of the thermostatic drum has a central hole that communicates with the fluid communication port. A rotary joint is mounted on the spindle. The end of the rotary joint away from the thermostatic drum is connected to a delivery pipe. One delivery pipe is connected to a temperature-controlled water tank, which contains a heater. The other delivery pipe is connected to the input end of a circulation pump, and the output end of the circulation pump is connected to the inside of the temperature-controlled water tank, forming a temperature-controlled fluid circulation loop.

[0009] Preferably, the first conveyor roller, the second conveyor roller, and the constant temperature drum are arranged in a triangular linkage positioning configuration. The first conveyor roller and the second conveyor roller are guide tension rollers of equal diameter. The outer diameter of the constant temperature drum is 6 to 10 times the outer diameter of the first conveyor roller and the second conveyor roller. The minimum radial vertical distance between the roller surface of the first conveyor roller and the second conveyor roller and the outer cylindrical surface of the constant temperature drum is 3 to 5 mm.

[0010] Preferably, the device also includes a frame, on which the thermostatic large roller is rotatably mounted. The tension adjustment assembly includes a support platform, which is located at the bottom of the frame. The front and rear ends of the first and second conveyor rollers are respectively provided with rotating shafts. Rolling elements are sleeved on the outside of the rotating shafts and are slidably embedded in the arc-shaped grooves. The arc-shaped grooves are opened on the inner side of the arc-shaped support frame. The bottom of the arc-shaped support frame is fixedly connected to the upper surface of the support platform through several support columns. The arc-shaped grooves are concentrically arranged with the center of the thermostatic large roller as the center, and the curvature of the arc-shaped grooves is adapted to the curvature of the outer cylindrical surface of the thermostatic large roller. Adjustment mechanisms are symmetrically arranged on the front and rear sides of the support platform. The adjustment mechanisms are used to adjust the position of the rolling elements in the arc-shaped grooves, thereby adjusting the position of the first and second conveyor rollers relative to the thermostatic large roller.

[0011] Preferably, the adjustment mechanism includes two fixed plates symmetrically arranged on the left and right sides of the constant temperature drum. The lower end of the fixed plates is fixedly connected to the upper surface of the support platform. A double-rotating screw is arranged between the two fixed plates. One end of the double-rotating screw extends to the outside of the fixed plate and is equipped with a drive motor. The drive motor is fixedly connected to the upper surface of the support platform. The double-rotating screw is provided with external threads of opposite directions. The outer sides of the opposite-rotating portions at both ends of the double-rotating screw are threaded with moving blocks. The lower end of the moving blocks is slidably connected to the upper surface of the support platform. A drive rod is provided at the upper end of the moving blocks. A long guide groove is provided inside the drive rod. The long guide groove is arranged along the length of the drive rod. The upper end of the drive rod is higher than the upper end of the arc-shaped support frame, and the lower end of the drive rod is lower than the lower end of the arc-shaped support frame. A rectangular slider is slidably arranged up and down inside the long guide groove. The rectangular slider is rotatably connected to the end of the rotating shaft.

[0012] Preferably, a connecting block is fixedly installed at the upper end of the drive rod, a guide hole is provided in the connecting block, a guide rod is slidably installed in the guide hole, and the left and right ends of the guide rod are fixedly connected to the side walls of the fixing plates on the left and right sides, respectively.

[0013] Preferably, a tension sensor is mounted on the first conveyor roller, which is used to detect the actual tension value of the printing substrate in real time. An angle sensor is mounted on the rectangular slider, which is used to collect the deflection angle of the rectangular slider in real time. The deflection angle is defined as the acute angle formed between the line connecting the center of the first conveyor roller and the center of the constant temperature roller and the vertical centerline passing through the center of the constant temperature roller. A first controller is fixed on the support platform. The first controller is electrically connected to the tension sensor, the angle sensor and the drive motor respectively. The first controller is configured to control the operation of the drive motor based on the detection signal of the tension sensor, including: calculating the tension deviation value according to the actual tension value and the preset reference tension value. When the absolute value of the tension deviation value exceeds the preset tension threshold, the first controller automatically calculates the angle compensation amount and sends a control command to the drive motor based on the angle compensation amount to drive the rectangular slider to adjust to the target deflection angle.

[0014] Preferably, a first temperature sensor is installed in the delivery pipe connected to the temperature-controlled water tank. The first temperature sensor is used to collect the inlet liquid temperature in the delivery pipe connected to the temperature-controlled water tank. A second temperature sensor is installed in the delivery pipe connected to the circulation pump. The second temperature sensor is used to collect the return liquid temperature in the delivery pipe connected to the circulation pump. A second controller is installed outside the temperature-controlled water tank. The second controller is electrically connected to the heater, the first temperature sensor, the second temperature sensor, and the circulation pump. Based on the temperatures collected by the first and second temperature sensors, the second controller controls the operation of the circulation pump and the heater, including the following steps: The inlet temperature of the liquid in the delivery pipe connected to the temperature-controlled water tank is collected by the first temperature sensor, and the return temperature of the liquid in the delivery pipe connected to the circulation pump is collected by the second temperature sensor. Set the preset target temperature for the surface of the thermostatic roller, which is 28~33℃. Based on the collected inlet and outlet liquid temperatures and the set target temperature, the heat exchange characteristic coefficient of the temperature control system at the current moment is calculated. The heat exchange characteristic coefficient is calculated using the following formula: ; in, Let be the heat exchange characteristic coefficient at time i. Let be the inlet temperature at time i. T1 represents the return temperature at time i, and T2 represents the preset target temperature. The current heat exchange characteristic coefficient is compared with the preset heat exchange characteristic coefficient, and the inlet temperature is adjusted according to the comparison result: if the current heat exchange characteristic coefficient is less than the preset heat exchange characteristic coefficient, the inlet temperature is increased; if the current heat exchange characteristic coefficient is greater than the preset heat exchange characteristic coefficient, the inlet temperature is decreased; if the current heat exchange characteristic coefficient is equal to the preset heat exchange characteristic coefficient, the inlet temperature is kept unchanged.

[0015] This invention also provides a satellite-type multi-process integrated digital printing method, which uses the above-mentioned satellite-type multi-process integrated digital printing apparatus for printing, and includes the following steps: S1. The printing substrate is passed through the first conveyor roller and attached to the surface of the constant temperature large roller, and then passed through the second conveyor roller. Then, based on the tension adjustment component, the tension of the printing substrate is adjusted by adjusting the position of the first conveyor roller and the second conveyor roller, and tension is applied according to the adjusted tension. S2. The pre-coating mechanism applies a pre-coating liquid to the printing substrate on the surface of the constant temperature roller. The printing substrate rotates with the constant temperature roller to the first drying mechanism, where the pre-coating liquid is dried to complete the pre-printing treatment. S3. The pre-printed substrate rotates with the constant temperature roller to the digital printing mechanism, where the digital printing mechanism prints the images onto the substrate, and the ink is dried by the inter-group drying mechanism. S4. The printing substrate rotates with the constant temperature large roller to the varnishing mechanism, which applies varnish to the graphic surface of the printing substrate. Then the printing substrate rotates to the second drying mechanism, which dries the varnish. S5. The printed substrate that has completed the varnish drying passes through the second conveyor roller to realize the finished product output and complete the printing operation.

[0016] The technical solution of the present invention has the following advantages: The present invention provides a satellite-type multi-process integrated digital printing device and printing method, which relates to the field of printing device technology. The printing device includes a constant temperature large roller, a first conveyor roller, a second conveyor roller, and a multi-process operation mechanism. The first conveyor roller and the second conveyor roller are symmetrically arranged on both sides of the constant temperature large roller. The multi-process operation mechanism is arranged sequentially along the outer circumferential surface of the constant temperature large roller, and all multi-process operation mechanisms are positioned and installed with the constant temperature large roller as the reference. The multi-process operation mechanism includes a pre-coating mechanism, a first drying mechanism, a digital printing mechanism, an inter-group drying mechanism, a varnishing mechanism, and a second drying mechanism. The printing substrate is introduced by the first conveyor roller, extended along the outer cylindrical surface of the constant temperature large roller, and then discharged by the second conveyor roller. The first conveyor roller, the second conveyor roller, and the constant temperature large roller work together to keep the printing substrate in a taut state and tightly adhere to the outer surface of the constant temperature large roller. In this invention, a multi-process operation mechanism is used to position and install the substrate using a constant-temperature large roller as a unified reference. The first and second conveying rollers work together with the constant-temperature large roller to make the substrate tightly bonded. This not only solves the problem of poor alignment accuracy caused by the lack of a unified positioning reference in the multi-process operation of traditional equipment, but also suppresses substrate transmission vibration and improves coating uniformity.

[0017] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the means particularly pointed out in the written description and the accompanying drawings.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the satellite-type multi-process integrated digital printing device of the present invention; Figure 2 This is a schematic diagram of the constant temperature drum structure in this invention; Figure 3 This is a side view of the constant temperature drum in this invention; Figure 4 This is a schematic diagram of the adjustment mechanism in this invention; Figure 5 For the present invention Figure 4 Enlarged view of the structure at point A in the middle; Figure 6 This is a schematic diagram of the steps of the satellite-type multi-process integrated digital printing method of the present invention.

[0020] In the diagram: 1. Constant temperature large drum; 2. First conveyor roller; 3. Second conveyor roller; 4. Pre-coating mechanism; 5. First drying mechanism; 6. Digital printing mechanism; 7. Inter-group drying mechanism; 8. Varnish mechanism; 9. Second drying mechanism; 10. Inner cylinder; 11. Outer cylinder; 12. Spiral flow channel; 13. Fluid communication port; 14. Support platform; 15. Rotating shaft; 16. Rolling element; 17. Arc groove; 18. Arc support frame; 19. Support column; 20. Fixing plate; 21. Double-rotating screw; 22. Drive motor; 23. Moving block; 24. Drive rod; 25. Long guide groove; 26. Rectangular slider; 27. Connecting block; 28. Guide rod. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] Example 1: This embodiment of the invention provides a satellite-type multi-process integrated digital printing device, such as... Figures 1-6As shown, it includes: a constant temperature large roller 1, a first conveyor roller 2, a second conveyor roller 3, and a multi-process operation mechanism. The first conveyor roller 2 and the second conveyor roller 3 are symmetrically arranged on both sides of the constant temperature large roller 1. The multi-process operation mechanism is arranged sequentially along the outer circumferential surface of the constant temperature large roller 1, and all multi-process operation mechanisms are positioned and installed with the constant temperature large roller 1 as the reference. The multi-process operation mechanism includes a pre-coating mechanism 4, a first drying mechanism 5, a digital printing mechanism 6, an inter-group drying mechanism 7, a varnishing mechanism 8, and a second drying mechanism 9. The printing substrate is introduced through the first conveyor roller 2, extends along the outer cylindrical surface of the constant temperature large roller 1, and is then discharged by the second conveyor roller 3. The first conveyor roller 2, the second conveyor roller 3, and the constant temperature large roller 1 work together to keep the printing substrate in a taut state and tightly adhere to the outer surface of the constant temperature large roller 1. A tension adjustment component is set below the constant temperature large roller 1. The tension adjustment component is used to adjust the position of the first conveyor roller 2 and the second conveyor roller 3, thereby adjusting the tension of the printing substrate.

[0024] The digital printing mechanism 6 includes several printing nozzle groups, which are arranged sequentially along the circumference of the constant temperature large roller 1, and the printing end of each printing nozzle group is perpendicular to the surface of the constant temperature large roller 1. Multiple inter-group drying mechanisms 7 are provided, and the multiple inter-group drying mechanisms 7 are arranged in a one-to-one correspondence with the printing nozzle group. That is, an inter-group drying mechanism 7 is set between any two printing nozzle groups. Each inter-group drying mechanism 7 is located on the side of the corresponding printing nozzle group facing the second conveyor roller 3, and the drying operation end of the inter-group drying mechanism 7 faces the printing substrate bonding area on the outer surface of the constant temperature large roller 1. The thermostatic drum 1 includes an inner cylinder 10 and an outer cylinder 11 arranged coaxially. The outer cylinder 11 is fixedly sleeved on the outside of the inner cylinder 10. The inner wall of the inner cylinder 10 is provided with a spiral flow channel 12, which extends along the axial direction of the inner cylinder 10. The two ends of the spiral flow channel 12 are respectively provided with fluid communication ports 13. The spindle of the thermostatic drum 1 is provided with a central hole, which is connected to the fluid communication port 13. A rotary joint is mounted on the spindle. The end of the rotary joint away from the thermostatic drum 1 is connected to a conveying pipe. One of the conveying pipes is connected to a temperature-controlled water tank, which is equipped with a heater. The other conveying pipe is connected to the input end of a circulation pump, and the output end of the circulation pump is connected to the inside of the temperature-controlled water tank, forming a temperature-controlled fluid circulation loop. The first conveyor roller 2, the second conveyor roller 3 and the constant temperature drum 1 are arranged in a triangular linkage positioning configuration. The first conveyor roller 2 and the second conveyor roller 3 are guide tension rollers of equal diameter. The outer diameter of the constant temperature drum 1 is 6 to 10 times the outer diameter of the first conveyor roller 2 and the second conveyor roller 3. The minimum radial vertical distance between the roller surface of the first conveyor roller 2 and the second conveyor roller 3 and the outer cylindrical surface of the constant temperature drum 1 is 3 to 5 mm. It also includes a machine frame, on which the constant temperature roller 1 is rotatably mounted. The tension adjustment assembly includes a support platform 14, which is located at the bottom of the machine frame. The front and rear ends of the first conveyor roller 2 and the second conveyor roller 3 are respectively provided with rotating shafts 15. Rolling elements 16 are sleeved on the outside of the rotating shafts 15. The rolling elements 16 are slidably embedded in the arc groove 17. The arc groove 17 is opened on the inner side of the arc support frame 18. The bottom of the arc support frame 18 is fixedly connected to the upper surface of the support platform 14 through several support columns 19. The arc groove 17 is concentrically arranged with the center of the constant temperature roller 1 as the center, and the curvature of the arc groove 17 is adapted to the curvature of the outer cylindrical surface of the constant temperature roller 1. Adjustment mechanisms are symmetrically arranged on the front and rear sides of the support platform 14. The adjustment mechanisms are used to adjust the position of the rolling elements 16 in the arc groove 17, thereby adjusting the position of the first conveyor roller 2 and the second conveyor roller 3 relative to the constant temperature roller 1. This invention also provides a satellite-type multi-process integrated digital printing method, which uses the above-mentioned satellite-type multi-process integrated digital printing apparatus for printing, and includes the following steps: S1. The printing substrate is passed through the first conveyor roller 2 and attached to the surface of the constant temperature large roller 1, and then passed through the second conveyor roller 3. Then, based on the tension adjustment component, the tension of the printing substrate is adjusted by adjusting the position of the first conveyor roller 2 and the second conveyor roller 3, and tensioning is performed according to the adjusted tension. S2. The pre-coating mechanism 4 applies a pre-coating liquid to the printing substrate on the surface of the constant temperature roller 1. The printing substrate rotates with the constant temperature roller 1 to the first drying mechanism 5, where the pre-coating liquid is dried by the first drying mechanism 5, thus completing the pre-printing treatment. S3. The pre-printed substrate rotates with the constant temperature roller 1 to the digital printing mechanism 6. The digital printing mechanism 6 sprays the images onto the substrate, and the ink is dried by the inter-group drying mechanism 7. S4. The printing substrate rotates with the constant temperature large roller 1 to the varnishing mechanism 8. The varnishing mechanism 8 applies varnish to the graphic surface of the printing substrate. Then the printing substrate rotates to the second drying mechanism 9, where the varnish is dried. S5. The printed substrate that has completed the drying of the varnish passes through the second conveyor roller 3 to realize the finished product output and complete the printing operation.

[0025] The working principle and beneficial effects of the above technical solution are as follows: The printing substrate is introduced by the first conveyor roller 2, extended along the outer cylindrical surface of the constant temperature roller 1, and then discharged by the second conveyor roller 3. The first conveyor roller 2, the second conveyor roller 3 and the constant temperature roller 1 work together. By adjusting the arrangement angle of the two relative to the constant temperature roller 1, that is, by adjusting the position of the first conveyor roller 2 and the second conveyor roller 3 through the tension adjustment component (the position change will necessarily change the deflection angle relative to the constant temperature roller 1), the tension of the printing substrate is adjusted to ensure that the printing substrate is always tightly attached to the outer surface of the constant temperature roller 1, providing a stable substrate support foundation for multi-process continuous operation. The multi-process operation is carried out in an orderly manner as follows: First, the pre-coating mechanism 4 evenly coats the surface of the printing substrate with pre-coating liquid to complete the pre-printing pretreatment; the pre-coated substrate then enters the first drying mechanism 5 to achieve rapid curing of the pre-coating liquid; the cured substrate then passes through the digital printing mechanism 6, which includes four-color printing nozzle groups of red, yellow, blue, and black, to complete precise printing according to preset graphic information; between each color group of the digital printing mechanism 6, there are inter-group drying mechanisms 7 to dry the ink after each color printing in time to avoid color smudging; the substrate after ink drying enters the varnish mechanism 8 to complete the post-printing varnish coating treatment; finally, the varnish layer is cured and dried by the second drying mechanism 9 to prevent smudging during subsequent transportation, and then it is discharged by the second conveyor roller 3 to enter the subsequent processing stage; When the printing substrate passes through the constant temperature roller 1, the temperature-controlled fluid in the temperature-controlled water tank is introduced into the central hole of the mandrel of the constant temperature roller 1 through the rotary joint and the conveying pipe. The uniform flow of the temperature-controlled fluid is achieved through the spiral flow channel 12 on the inner wall of the inner cylinder 10. Through the precise control of the fluid temperature by the temperature-controlled water tank, the outer surface temperature of the constant temperature roller 1 is stabilized at the target temperature suitable for the substrate material. The target temperature is 28~33℃, and the temperature fluctuation is controlled within ±1℃, providing a constant and uniform temperature environment for the printing substrate. The minimum radial vertical distance between the surfaces of the first conveyor roller 2 and the second conveyor roller 3 and the outer cylindrical surface of the constant temperature roller 1 is 3~5mm. The rolling element 16 is driven to slide along the arc groove 17 by the tension adjustment mechanism on the support platform 14. The position of the first conveyor roller 2 and the second conveyor roller 3 relative to the constant temperature roller 1 can be flexibly adjusted, thereby controlling the wrap angle of the printing substrate on the constant temperature roller 1 to between 270° and 315°, changing the bonding area between the printing substrate and the constant temperature roller 1, and ensuring that the substrate is always tightly bonded to the roller surface during each process, avoiding loosening or displacement. By arranging the pre-coating mechanism 4, the first drying mechanism 5, the digital printing mechanism 6, the inter-group drying mechanism 7, the varnishing mechanism 8, and the second drying mechanism 9 sequentially around the constant temperature large roller 1, and using the constant temperature large roller 1 as a unified reference for positioning and installation, the problem of no unified positioning reference in traditional multi-equipment collaborative operations is completely solved. This significantly improves the registration accuracy between pre-coating, varnishing, and graphics, optimizing the original positional deviation between pre-coating, varnishing, and graphics from 5mm to 2mm. At the same time, the registration accuracy between each printing color group is improved from ±0.05mm to ±0.02mm, greatly reducing the scrap rate caused by registration deviation. Furthermore, by integrating pre-press, printing, and post-press processes into one, the production process is simplified and production efficiency is improved. The thermostatic roller 1 is rotatably mounted on the equipment frame. The support platform 14 at the bottom of the equipment frame provides stable support for the overall structure. The arc-shaped groove 17 is concentrically arranged with the thermostatic roller 1 as the center, and the curvature is adapted to the outer cylindrical surface of the roller. This ensures that the first conveyor roller 2 and the second conveyor roller 3 slide along the preset concentric trajectory, always ensuring the bonding accuracy between the printing substrate and the thermostatic roller 1, and structurally preventing substrate transmission deviation and vibration. Through the synergistic tensioning effect of the first conveyor roller 2, the second conveyor roller 3 and the thermostatic roller 1, the printing substrate is tightly bonded to the roller surface, effectively suppressing the vibration phenomenon of the substrate during transmission and printing. On the one hand, it ensures the uniformity of the pre-coating liquid and varnish coating, improving the surface treatment quality of the substrate. On the other hand, it can shorten the distance between the digital printing nozzle assembly and the substrate surface from >3mm to <2mm, significantly optimizing the inkjet halftone reproduction rate and further improving the printing accuracy. The constant-temperature roller 1 can precisely set and stably maintain a target surface temperature of 28~33℃ according to the characteristics of different printing substrates, with temperature fluctuations controlled within ±1℃. This avoids the adverse effects of ambient temperature fluctuations on ink curing and coating adhesion, improving print quality stability and significantly reducing the equipment's stringent requirements for ambient temperature and humidity, thus broadening the device's adaptability to various printing substrates. The constant-temperature roller 1, combined with the adaptive tension control of the tension adjustment component, can precisely adjust the positions of the first conveyor roller 2 and the second conveyor roller 3 according to the substrate material and specifications, controlling the substrate's temperature within a constant range. The wrap angle on the temperature-controlled roller 1 maintains a suitable tension, ensuring that the substrate is always in close contact with the surface of the temperature-controlled roller 1. This effectively suppresses vibration, loosening, or excessive stretching of the substrate during transmission. It also works with the surface of the temperature-controlled roller 1 to correct substrate curling, while ensuring the uniformity of pre-coating liquid and varnish coating. The distance between the printing nozzle assembly and the substrate surface is precisely and stably controlled to <2mm, significantly optimizing the dot reproduction rate of the inkjet print. The combination of these two factors further improves the registration accuracy and surface forming quality of the printed products, and also broadens the adaptability of the device to different substrate materials, reducing the stringent requirements of the equipment on the temperature and humidity of the operating environment. The four-color printhead group of the digital printing unit 6 is based on a unified reference positioning and combines the advantages of stable substrate transmission to improve the registration accuracy between color groups from ±0.05mm to ±0.02mm; the setting of the inter-group drying mechanism 7 enables timely curing of ink and avoids the problem of color smudging; at the same time, the tight adhesion of the substrate to the surface of the constant temperature large roller 1 can realize the correction of curling and play a role in de-curling, further ensuring the flatness and consistency of the printed products.

[0026] Example 2: Based on Example 1 above, the adjustment mechanism includes two fixed plates 20, which are symmetrically arranged on the left and right sides of the constant temperature drum 1. The lower end of the fixed plates 20 is fixedly connected to the upper surface of the support platform 14. A double-rotating screw 21 is provided between the two fixed plates 20. One end of the double-rotating screw 21 extends to the outside of the fixed plate 20 and is equipped with a drive motor 22. The drive motor 22 is fixedly connected to the upper surface of the support platform 14. The double-rotating screw 21 is provided with external threads of opposite directions. The outer sides of the oppositely rotated portions are threaded with movable blocks 23. The lower end of the movable blocks 23 is slidably connected to the upper surface of the support platform 14. A drive rod 24 is provided at the upper end of the movable blocks 23. A long guide groove 25 is provided inside the drive rod 24. The long guide groove 25 is set along the length of the drive rod 24. The upper end of the drive rod 24 is higher than the upper end of the arc-shaped support frame 18, and the lower end of the drive rod 24 is lower than the lower end of the arc-shaped support frame 18. A rectangular slider 26 is slidably arranged up and down inside the long guide groove 25. The rectangular slider 26 is rotatably connected to the end of the rotating shaft 15. A connecting block 27 is fixedly installed at the upper end of the drive rod 24. A guide hole is provided in the connecting block 27. A guide rod 28 is slidably installed in the guide hole. The left and right ends of the guide rod 28 are fixedly connected to the side walls of the fixing plates 20 on the left and right sides, respectively.

[0027] The working principle and beneficial effects of the above technical solution are as follows: The drive motor 22, upon starting, can drive the double-rotating screw 21 to rotate between the two fixed plates 20. Since the double-rotating screw 21 has external threads with opposite directions at both ends, and the moving block 23 is threadedly connected to the corresponding threaded section of the double-rotating screw 21, and the lower end of the moving block 23 slides in cooperation with the support platform 14, while the upper end slides and is limited by the connecting block 27 and the guide rod 28, when the double-rotating screw 21 rotates, the moving blocks 23 at both ends slide synchronously towards or away from each other along the upper surface of the support platform 14. During the sliding process of the moving blocks 23, the moving blocks 23 drive the upper drive rod 24 to move along with them. The drive rod 24, through the sliding cooperation of the long guide groove 25 and the rectangular slider 26, pushes the rolling element 16 to slide along the arc groove 17, thereby driving the first conveyor roller 2 and the second conveyor roller 3 to adjust their relative positions to the constant-temperature large roller 1, ultimately achieving… The positions of the first conveyor roller 2 and the second conveyor roller 3 relative to the constant temperature roller 1 are adjusted synchronously to achieve precise control of the wrap angle of the printing substrate on the constant temperature roller 1. The upper connecting block 27 of the drive rod 24 and the guide rod 28 slide together to guide and limit the movement of the drive rod 24, ensuring smooth and precise adjustment. The double-rotating screw 21 drive structure is adopted to achieve synchronous and symmetrical adjustment of the first conveyor roller 2 and the second conveyor roller 3, effectively preventing the substrate from running off-center and unevenly tensioned due to asynchronous adjustment on both sides, and improving the accuracy and stability of the wrap angle adjustment. This adjustment mechanism can precisely control the position of the first conveyor roller 2 and the second conveyor roller 3, thereby optimizing the wrap angle and tension of the substrate on the constant temperature roller 1. Combined with the supporting role of the constant temperature roller 1, it further suppresses the vibration of the substrate during the transmission process, provides stable substrate support for multi-process printing, and indirectly improves the registration accuracy and coating uniformity of the printed products.

[0028] Example 3: Based on Example 2, a tension sensor is installed on the first conveyor roller 2. The tension sensor is used to detect the actual tension value of the printing substrate in real time. An angle sensor is installed on the rectangular slider 26. The angle sensor is used to collect the deflection angle of the rectangular slider 26 in real time. The deflection angle is defined as the acute angle formed between the line connecting the center of the first conveyor roller 2 and the center of the constant temperature roller 1, and the vertical center line passing through the center of the constant temperature roller 1. The center of the first conveyor roller 2 coincides with the center of the rectangular slider 26 and the center of the rotating shaft 15. Therefore, when the position of the rectangular slider 26 changes, its deflection angle will inevitably change as well. A first controller is fixed on the support platform 14. The first controller is electrically connected to the tension sensor, the angle sensor and the drive motor 22 respectively. The first controller is configured to control the drive motor 22 to work based on the detection signal of the tension sensor, including: calculating the tension deviation value according to the actual tension value and the preset reference tension value. When the absolute value of the tension deviation value exceeds the preset tension threshold, the first controller automatically calculates the angle compensation amount and sends a control command to the drive motor 22 based on the angle compensation amount to drive the rectangular slider 26 to adjust to the target deflection angle.

[0029] The working principle and beneficial effects of the above technical solution are as follows: Because different printing substrates have different elastic moduli, thicknesses, and widths, the required wrap angle during the printing process also varies. As the printing substrate changes, the first controller can control the drive motor 22 based on the material of the printing substrate, thereby adaptively adjusting the wrap angle. Specifically: Taking common materials such as plastic film, thick cardboard, elastic non-woven fabric, and aluminum foil as examples of printing substrate materials, the first controller first adjusts the deflection angle of the rectangular slider 26 to the initial deflection angle based on the printing substrate material. The initial deflection angle is calculated using the following formula: ;in, Let be the initial deflection angle of the rectangular slider 26. The safety wrap angle is the lower limit value. Among them, the safety wrap angle range of plastic film is 300°~315°, the safety wrap angle range of thick cardboard is 270°~290°, the safety wrap angle range of elastic non-woven fabric is 290°~310°, and the safety wrap angle range of aluminum foil is 280°~300°. Taking plastic film as an example, when plastic film is selected as the printing substrate, the initial deflection angle of the plastic film is calculated to be 30°. At this time, the first controller controls the drive motor 22 to work. When the deflection angle of the rectangular slider 26 detected by the angle sensor reaches the initial deflection angle, the first controller controls the drive motor 22 to stop working. The preset reference tension value is calculated based on the material of the printing substrate: ;in, This is the preset reference tension value for the printing substrate. The elastic modulus of the printing substrate. The thickness of the printing substrate, The width of the printing substrate, The tension correction factor is an empirical value, ranging from 0.8 to 1.2, and is fine-tuned according to different printing substrates. Specifically, the tension correction factor is 1.0 for plastic film, 1.2 for thick cardboard, 0.8 for elastic nonwoven fabric, and 1.1 for aluminum foil. Next, the first controller detects the actual tension value of the printing substrate in real time based on the tension sensor, and calculates the tension deviation value using the following formula: ;in, This is the tension deviation value. To enable the tension sensor to detect the actual tension value of the printing substrate in real time, This is the preset reference tension value for the printing substrate; The first controller compares the tension deviation value with a preset tension threshold. The preset tension thresholds are 0.05N for plastic film, 0.1N for thick cardboard, 0.08N for non-woven fabric, and 0.07N for aluminum foil. When the absolute value of the tension deviation exceeds the preset tension threshold, the angle compensation amount is calculated using the following formula: ;in, For angle compensation amount, The compensation coefficient for the printing substrate is expressed in ° / N. The compensation coefficients are: 0.25° / N for plastic film, 0.12° / N for thick cardboard, 0.30° / N for elastic nonwoven fabric, and 0.18° / N for aluminum foil. The correction values ​​for printing substrates are as follows: 0.08° for plastic film, 0.03° for thick cardboard, 0.10° for elastic nonwoven fabric, and 0.05° for aluminum foil. This is the elasticity correction term, which applies to elastic substrates, such as elastic nonwoven fabrics. For non-elastic substrates, the elasticity correction term is 0. The elasticity correction term is calculated using the following formula: ;in, For the elasticity correction term, This is the tension deviation value. This is the preset reference tension value for the printing substrate. The preset elastic modulus is 250 MPa. The elastic modulus of the elastic substrate; Then, the first controller sends a control command to the drive motor 22 based on the angle compensation amount, driving the rectangular slider 26 to adjust to the target deflection angle: When the tension deviation is greater than 0, the target deflection angle is: ; When the tension deviation is less than 0, the target deflection angle is: ; in, To the target deflection angle, Let be the initial deflection angle of the rectangular slider 26. The angle compensation amount is as follows: When the tension deviation value is greater than zero, the first controller determines that the tension of the printing substrate is too large, controls the increase of the deflection angle of the rectangular slider 26, and controls the drive motor 22 to move, driving the first conveyor roller 2 to move away from the vertical center line of the constant temperature roller 1, so as to reduce the tension of the printing substrate. When the tension deviation value is less than zero, the first controller determines that the tension of the printing substrate is insufficient, controls the reduction of the deflection angle of the rectangular slider 26, and controls the drive motor 22 to move, driving the first conveyor roller 2 to move towards the vertical center line of the constant temperature roller 1, so as to increase the tension of the printing substrate. The above solution enables automatic tension adjustment based on different printing substrates without manual intervention, significantly improving the accuracy and response speed of tension control. This ensures that the printing substrate is always kept in a suitable tension state, improving the stability of print quality. Furthermore, it can adapt to the tension requirements of printing substrates of different materials and specifications, broadening the application range of printing equipment.

[0030] Example 4: Based on any one of Examples 1-3, a first temperature sensor is installed in the delivery pipe connected to the temperature-controlled water tank. The first temperature sensor is used to collect the inlet liquid temperature in the delivery pipe connected to the temperature-controlled water tank. A second temperature sensor is installed in the delivery pipe connected to the circulation pump. The second temperature sensor is used to collect the return liquid temperature in the delivery pipe connected to the circulation pump. A second controller is installed outside the temperature-controlled water tank. The second controller is electrically connected to the heater, the first temperature sensor, the second temperature sensor, and the circulation pump. Based on the temperatures collected by the first and second temperature sensors, the second controller controls the operation of the circulation pump and the heater, including the following steps: The inlet temperature of the liquid in the delivery pipe connected to the temperature-controlled water tank is collected by the first temperature sensor, and the return temperature of the liquid in the delivery pipe connected to the circulation pump is collected by the second temperature sensor. The preset target temperature corresponding to the surface of the constant temperature roller 1 is set to 28~33℃. According to experience, selecting a preset target temperature of 28~33℃ can ensure that the surface temperature of the constant temperature roller 1 meets the requirements of a good printing environment. Moreover, it can cooperate with the first drying mechanism 5, the inter-group drying mechanism 7 and the second drying mechanism 9 to ensure that the printing substrate is heated synchronously from bottom to top and from top to bottom, thereby improving drying efficiency and drying uniformity and enhancing printing effect. Based on the collected inlet and outlet liquid temperatures and the set target temperature, the heat exchange characteristic coefficient of the temperature control system at the current moment is calculated. The heat exchange characteristic coefficient is calculated using the following formula: ; in, Let be the heat exchange characteristic coefficient at time i. Let be the inlet temperature at time i. T1 represents the return temperature at time i, and T2 represents the preset target temperature. The current heat exchange characteristic coefficient is compared with the preset heat exchange characteristic coefficient, and the inlet temperature is adjusted according to the comparison result: if the current heat exchange characteristic coefficient is less than the preset heat exchange characteristic coefficient, the inlet temperature is increased; if the current heat exchange characteristic coefficient is greater than the preset heat exchange characteristic coefficient, the inlet temperature is decreased; if the current heat exchange characteristic coefficient is equal to the preset heat exchange characteristic coefficient, the inlet temperature is kept unchanged.

[0031] The working principle and beneficial effects of the above technical solution are as follows: By collecting the inlet and return temperatures of the temperature-controlled fluid, calculating the heat exchange characteristic coefficient and comparing it with a preset heat exchange characteristic coefficient, precise closed-loop control of the constant-temperature roller temperature is achieved. The specific steps are as follows: The inlet temperature in the delivery pipe connected to the temperature-controlled water tank is collected by a first temperature sensor, and the return temperature in the delivery pipe connected to the circulating pump is collected by a second temperature sensor. Then, based on the printing process requirements and the characteristics of the printing substrate, a preset target temperature corresponding to the surface of the constant-temperature roller is set. This temperature is the optimal temperature control reference for the printing substrate. The preset target temperature is preferably 28~33℃, and the adjustment range of the inlet temperature is set to 30~40℃. This range is suitable for… The system requires a preset target temperature for temperature control, avoiding overheating and deformation of the substrate due to excessively high inlet liquid temperature, and temperature control failure due to excessively low temperature. Then, the second controller calculates the heat exchange characteristic coefficient of the temperature control system based on the collected inlet liquid temperature, return liquid temperature, and the set preset target temperature. The calculation process includes: firstly, calculating the difference between the square of the return liquid temperature and the square of the preset target temperature to obtain the first temperature square difference. The first temperature square difference reflects the closeness of the fluid temperature after heat exchange to the preset target temperature. The larger the first temperature square difference, the greater the difference between the return liquid temperature and the preset target temperature, indicating more residual heat carried by the fluid, indirectly reflecting insufficient heat exchange efficiency and that the fluid has not fully transferred heat to the constant-temperature drum; the smaller the first temperature square difference... This indicates that the closer the fluid temperature after heat exchange is to the preset target temperature, the better the heat exchange effect. Next, the difference between the square of the inlet temperature and the square of the preset target temperature is calculated to obtain the second temperature square difference. The second temperature square difference reflects the potential energy difference between the fluid temperature before heat exchange and the preset target temperature. The larger the second temperature square difference, the stronger the thermal potential energy of the inlet temperature relative to the preset target temperature, and the stronger the theoretical heat exchange capacity; the smaller the second temperature square difference, the weaker the thermal potential energy, and the more limited the theoretical heat exchange capacity. Then, the first temperature square difference is divided by the second temperature square difference to obtain the first ratio. If the first ratio is close to 1, it indicates that the first temperature square difference and the second temperature square difference are similar, meaning that most of the thermal potential energy carried by the inlet fluid is transferred out through heat exchange, and the heat exchange is efficient. High utilization rate: If the ratio is much less than 1, it indicates that the first temperature square difference is much smaller than the second temperature square difference, meaning the thermal potential energy of the incoming liquid is not fully utilized, resulting in low heat exchange efficiency. Divide the square of the return liquid temperature by the square of the incoming liquid temperature to obtain the second ratio. If the second ratio is close to 1, it indicates that the difference between the return liquid temperature and the supply liquid temperature is small, resulting in less heat transfer. If the second ratio is smaller, it indicates that the difference between the return liquid temperature and the supply liquid temperature is large, resulting in more heat transfer. Finally, divide the first ratio by the second ratio to obtain the heat exchange characteristic coefficient, where the incoming liquid temperature is higher than the return liquid temperature, and the return liquid temperature is higher than the preset target temperature. Finally, compare the current heat exchange characteristic coefficient with the preset heat exchange characteristic coefficient (the preset heat exchange characteristic coefficient ranges from 0.6 to 0.5).8) Adjust the inlet temperature based on the comparison results: If the current heat exchange characteristic coefficient is less than the preset heat exchange characteristic coefficient, the inlet temperature is increased. The second controller sends a power increase command to the heater's power adjustment module, increasing the inlet temperature in steps of 0.5-1℃ / time. After each increase, a predetermined time interval is maintained, and the inlet and return temperatures are re-acquired and the heat exchange characteristic coefficient is calculated until the current heat exchange characteristic coefficient approaches the preset heat exchange characteristic coefficient, and the inlet temperature does not exceed the upper limit of 40℃. If the current heat exchange characteristic coefficient is greater than the preset heat exchange characteristic coefficient, the inlet temperature is decreased. The controller sends a power decrease command to the electric heater's power adjustment module, decreasing the inlet temperature in steps of 0.5-1℃ / time. After each decrease, a predetermined time interval is maintained, and the inlet and return temperatures are re-acquired and the heat exchange characteristic coefficient is calculated. The characteristic coefficient is maintained until it approaches the preset heat exchange characteristic coefficient, and the inlet liquid temperature is not lower than the lower limit of 30℃. If the current heat exchange characteristic coefficient equals the preset heat exchange characteristic coefficient, the inlet liquid temperature and heater power remain unchanged, thus maintaining a stable inlet liquid temperature. Through the coordinated calculation of the inlet liquid temperature, return liquid temperature, and preset target temperature, the heat exchange characteristic coefficient can comprehensively characterize the system's heat exchange state, avoiding the one-sidedness of controlling only the temperature difference parameter between the inlet and return liquid temperatures. This ensures that the surface temperature of the constant-temperature roller is controlled between 28~33℃, with temperature fluctuations controlled within ±1℃, improving the registration accuracy and coating uniformity of printed products. Based on the on-demand control of the heat exchange characteristic coefficient, excessive heater operation or ineffective energy consumption of the circulating pump is avoided, reducing equipment operating costs while ensuring temperature control accuracy, and achieving a balance between energy saving and high efficiency.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A satellite-type multi-process integrated digital printing device, characterized in that, include: The system comprises a constant-temperature large roller (1), a first conveyor roller (2), a second conveyor roller (3), and a multi-process operating mechanism. The first conveyor roller (2) and the second conveyor roller (3) are symmetrically arranged on both sides of the constant-temperature large roller (1). The multi-process operating mechanism is arranged sequentially along the outer circumferential surface of the constant-temperature large roller (1), and all multi-process operating mechanisms are positioned and installed with the constant-temperature large roller (1) as the reference. The multi-process operating mechanism includes a pre-coating mechanism (4), a first drying mechanism (5), a digital printing mechanism (6), an inter-group drying mechanism (7), a varnishing mechanism (8), and a second... The drying mechanism (9) introduces the printing substrate through the first conveyor roller (2), extends along the outer cylindrical surface of the constant temperature drum (1), and is then discharged by the second conveyor roller (3). The first conveyor roller (2), the second conveyor roller (3) and the constant temperature drum (1) work together to keep the printing substrate in a taut state and tightly adhere to the outer surface of the constant temperature drum (1). A tension adjustment component is set below the constant temperature drum (1). The tension adjustment component is used to adjust the position of the first conveyor roller (2) and the second conveyor roller (3), thereby adjusting the tension of the printing substrate.

2. The satellite-type multi-process integrated digital printing device according to claim 1, characterized in that, The digital printing mechanism (6) includes several printing nozzle groups, which are arranged sequentially along the circumference of the constant temperature roller (1). The printing end of each printing nozzle group is perpendicular to the surface of the constant temperature roller (1). A set of component drying mechanism (7) is arranged between any two printing nozzle groups. Each inter-group drying mechanism (7) is located on the side of the corresponding printing nozzle group facing the second conveyor roller (3), and the drying end of the inter-group drying mechanism (7) faces the printing substrate bonding area on the outer surface of the constant temperature roller (1).

3. The satellite-type multi-process integrated digital printing device according to claim 1, characterized in that, The thermostatic drum (1) includes an inner cylinder (10) and an outer cylinder (11) arranged coaxially. The outer cylinder (11) is fixedly sleeved on the outside of the inner cylinder (10). The inner wall of the inner cylinder (10) is provided with a spiral flow channel (12). The spiral flow channel (12) extends along the axial direction of the inner cylinder (10). The two ends of the spiral flow channel (12) are respectively provided with fluid communication ports (13). The core shaft of the thermostatic drum (1) is provided with a central hole. The central hole is connected to the fluid communication port (13). A rotary joint is mounted on the core shaft. The end of the rotary joint away from the thermostatic drum (1) is connected to a conveying pipe. One of the conveying pipes is connected to a temperature-controlled water tank. A heater is installed in the temperature-controlled water tank. The other conveying pipe is connected to the input end of the circulation pump. The output end of the circulation pump is connected to the inside of the temperature-controlled water tank, forming a temperature-controlled fluid circulation loop.

4. The satellite-type multi-process integrated digital printing device according to claim 1, characterized in that, The first conveyor roller (2), the second conveyor roller (3) and the constant temperature drum (1) are arranged in a triangular linkage positioning. The first conveyor roller (2) and the second conveyor roller (3) are guide tension rollers of equal diameter. The outer diameter of the constant temperature drum (1) is 6 to 10 times the outer diameter of the first conveyor roller (2) and the second conveyor roller (3). The minimum radial vertical distance between the roller surface of the first conveyor roller (2) and the second conveyor roller (3) and the outer cylindrical surface of the constant temperature drum (1) is 3 to 5 mm.

5. The satellite-type multi-process integrated digital printing device according to claim 1, characterized in that, It also includes an equipment frame, a constant temperature roller (1) is rotatably mounted on the equipment frame, and a tension adjustment assembly including a support platform (14), which is located at the bottom of the equipment frame. The first conveyor roller (2) and the second conveyor roller (3) are each provided with a rotating shaft (15) at their front and rear ends. A rolling element (16) is sleeved on the outside of the rotating shaft (15). The rolling element (16) is slidably embedded in the arc groove (17). The arc groove (17) is opened on the inner side of the arc support frame (18). The bottom of the support platform (14) is fixedly connected to the upper surface of the support platform (14) by several support columns (19). The arc groove (17) is arranged concentrically with the center of the constant temperature drum (1) as the center, and the arc of the arc groove (17) is adapted to the arc of the outer cylindrical surface of the constant temperature drum (1). The support platform (14) is symmetrically equipped with adjustment mechanisms on the front and rear sides. The adjustment mechanism is used to adjust the position of the rolling part (16) in the arc groove (17), and then adjust the position of the first conveying roller (2) and the second conveying roller (3) relative to the constant temperature drum (1).

6. The satellite-type multi-process integrated digital printing device according to claim 5, characterized in that, The adjustment mechanism includes two fixed plates (20), which are symmetrically arranged on the left and right sides of the constant temperature drum (1). The lower end of the fixed plate (20) is fixedly connected to the upper surface of the support platform (14). A double-rotating screw (21) is provided between the two fixed plates (20). One end of the double-rotating screw (21) extends to the outside of the fixed plate (20) and is equipped with a drive motor (22). The drive motor (22) is fixedly connected to the upper surface of the support platform (14). The double-rotating screw (21) is provided with external threads of opposite rotation. The outer sides of the opposite rotation at both ends of the double-rotating screw (21) are both threaded. The moving block (23) is connected to the upper surface of the support platform (14). The lower end of the moving block (23) is slidably connected to the upper surface of the support platform (14). The upper end of the moving block (23) is provided with a drive rod (24). The drive rod (24) is provided with a long guide groove (25). The long guide groove (25) is set along the length direction of the drive rod (24). The upper end of the drive rod (24) is higher than the upper end of the arc support frame (18), and the lower end of the drive rod (24) is lower than the lower end of the arc support frame (18). The rectangular slider (26) is slidably set up and down in the long guide groove (25). The rectangular slider (26) is rotatably connected to the end of the rotating shaft (15).

7. The satellite-type multi-process integrated digital printing device according to claim 6, characterized in that, A connecting block (27) is fixedly installed at the upper end of the drive rod (24). A guide hole is provided inside the connecting block (27). A guide rod (28) is slidably installed inside the guide hole. The left and right ends of the guide rod (28) are fixedly connected to the side walls of the fixing plates (20) on the left and right sides, respectively.

8. The satellite-type multi-process integrated digital printing device according to claim 6, characterized in that, A tension sensor is mounted on the first conveyor roller (2). The tension sensor is used to detect the actual tension value of the printing substrate in real time. An angle sensor is mounted on the rectangular slider (26). The angle sensor is used to collect the deflection angle of the rectangular slider (26) in real time. The deflection angle is defined as the acute angle formed between the line connecting the center of the first conveyor roller (2) and the center of the constant temperature roller (1) and the vertical center line passing through the center of the constant temperature roller (1). A first controller is fixed on the support platform (14). The first controller is electrically connected to the tension sensor, the angle sensor and the drive motor (22) respectively. The first controller is configured to control the drive motor (22) to work based on the detection signal of the tension sensor. The first controller includes: calculating the tension deviation value according to the actual tension value and the preset reference tension value. When the absolute value of the tension deviation value exceeds the preset tension threshold, the first controller automatically calculates the angle compensation amount and sends a control command to the drive motor (22) based on the angle compensation amount to drive the rectangular slider (26) to adjust to the target deflection angle.

9. The satellite-type multi-process integrated digital printing device according to claim 3, characterized in that, A first temperature sensor is installed in the delivery pipe connected to the temperature-controlled water tank. The first temperature sensor is used to collect the inlet liquid temperature in the delivery pipe connected to the temperature-controlled water tank. A second temperature sensor is installed in the delivery pipe connected to the circulation pump. The second temperature sensor is used to collect the return liquid temperature in the delivery pipe connected to the circulation pump. A second controller is installed outside the temperature-controlled water tank. The second controller is electrically connected to the heater, the first temperature sensor, the second temperature sensor, and the circulation pump. Based on the temperatures collected by the first temperature sensor and the second temperature sensor, the second controller controls the operation of the circulation pump and the heater, including the following steps: The inlet temperature of the liquid in the delivery pipe connected to the temperature-controlled water tank is collected by the first temperature sensor, and the return temperature of the liquid in the delivery pipe connected to the circulation pump is collected by the second temperature sensor. Set the preset target temperature for the surface of the thermostatic roller, which is 28~33℃. Based on the collected inlet and outlet liquid temperatures and the set target temperature, the heat exchange characteristic coefficient of the temperature control system at the current moment is calculated. The heat exchange characteristic coefficient is calculated using the following formula: ; in, Let be the heat exchange characteristic coefficient at time i. Let be the inlet temperature at time i. T1 represents the return temperature at time i, and T2 represents the preset target temperature. The current heat exchange characteristic coefficient is compared with the preset heat exchange characteristic coefficient, and the inlet temperature is adjusted according to the comparison result: if the current heat exchange characteristic coefficient is less than the preset heat exchange characteristic coefficient, the inlet temperature is increased; if the current heat exchange characteristic coefficient is greater than the preset heat exchange characteristic coefficient, the inlet temperature is decreased; if the current heat exchange characteristic coefficient is equal to the preset heat exchange characteristic coefficient, the inlet temperature is kept unchanged.

10. A satellite-type multi-process integrated digital printing method, comprising printing using a satellite-type multi-process integrated digital printing apparatus as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. The printing substrate is passed through the first conveyor roller (2) and attached to the surface of the constant temperature large roller (1), and then passed through the second conveyor roller (3). Based on the tension adjustment component, the tension of the printing substrate is adjusted by adjusting the position of the first conveyor roller (2) and the second conveyor roller (3), and then tensioned according to the adjusted tension. S2. The pre-coating liquid is applied to the printing substrate on the surface of the constant temperature roller (1) by the pre-coating mechanism (4). The printing substrate rotates with the constant temperature roller (1) to the first drying mechanism (5), and the pre-coating liquid is dried by the first drying mechanism (5) to complete the pre-printing treatment. S3. The pre-printed substrate rotates with the constant temperature roller (1) to the digital printing mechanism (6), and the digital printing mechanism (6) sprays the images onto the substrate. The ink is then dried by the inter-group drying mechanism (7). S4. The printing substrate rotates with the constant temperature roller (1) to the varnishing mechanism (8). The varnishing mechanism (8) applies varnish to the graphic surface of the printing substrate. Then the printing substrate rotates to the second drying mechanism (9), where the varnish is dried. S5. The printing substrate that has completed the varnish drying passes through the second conveyor roller (3) to realize the finished product output and complete the printing operation.

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