Printing method and device adopting high-speed intelligent digital printing

Abstract

The invention discloses a printing method and device adopting high-speed intelligent digital printing, and the method comprises the first step of starting up preparation before printing, the second step of placing a to-be-printed material on a conveying assembly, the third step of calling a to-be-printed file for pre-printing at first in the printing stage, and the fourth step of printing after each time of printing is finished. S32, processing based on the viscosity of the printing ink, if the viscosity of the printing ink is greater than a preset value, entering S31, otherwise, entering S32; s31, the inner side wall of the ink jet head is heated to 50 DEG C, and S32, waste liquid remaining in the ink jet head is cleaned through a negative pressure pump and discharged into a collection box; and fourthly, the printed materials are dried through a drying unit, and the dried materials are conveyed to a material collecting assembly through a conveying assembly to be collected. Through the design of the ink inlet pipe and the negative pressure pipe and the combination of real-time adjustment of the control valve, rapid conduction of the spray head is achieved through pulse type adsorption of the negative pressure pipe when printing is finished every time.

Description

Technical Field

[0001] The present invention relates to the field of inkjet printing devices, and more specifically, to a high-speed intelligent digital printing device and a printing method. Background Art

[0002] In the field of inkjet printing devices, with the surging demand for personalized printing and the pursuit of efficiency in industrial production, high-speed intelligent digital printing technology has become an important direction for the development of the industry. However, as the printing time increases, ink may coagulate and adhere inside the inkjet printer nozzle, causing blockage or partial blockage of the nozzles, making the nozzles of the inkjet printer unable to work properly and affecting the printing quality. In existing devices, usually the nozzle is removed and then the nozzles are cleaned, or the nozzle is directly cleaned through a liquid supply pump. Although this cleaning method can clean the nozzle, it is easy to damage the nozzle, and the cleaning efficiency is low, unable to meet the requirements of high-speed printing. For example, a nozzle cleaning device and method for inkjet printing disclosed in Patent Application No. CN202311654760.X, in which the nozzle is cleaned by cleaning mechanisms such as a water pump. During the cleaning process, this may cause damage to the nozzle, and the nozzle needs to be disassembled and replaced, resulting in low efficiency. Summary of the Invention

[0003] An object of the present invention is to solve at least the above problems and / or defects and provide at least the advantages described hereinafter.

[0004] To achieve these objects and other advantages of the present invention, a printing method using high-speed intelligent digital printing is provided, including:

[0005] Step 1, the startup preparation stage before printing:

[0006] Step 2, place the material to be printed on the conveying component, and transmit the material to below the inkjet printing component through the conveying component;

[0007] Step 3, in the printing stage, first call the file to be printed for pre-printing, select different inks according to different printing files, the printing length is less than 10 cm, and observe whether the pre-printed content meets the printing requirements through a camera. If it meets, call the file to be printed again for normal printing. If it does not meet, return to Step 3 again:

[0008] S30, after each printing is completed, judge based on the viscosity of the ink. If the viscosity of the ink is greater than the preset value, enter S31, otherwise directly enter S32;

[0009] S31. Switch the working state of the heating component at the inkjet head, heat the inner wall of the inkjet head to 50 °C, heat the ink at the inner wall of the inkjet head, and reduce its viscosity.

[0010] S32. Open the control valve I on the negative pressure pipe and close the control valve II on the ink inlet pipe. Clean the waste liquid remaining inside the inkjet head through the negative pressure pump and discharge the waste liquid into the collection box.

[0011] Step Four. Dry the printed material through the drying unit, and convey the dried material to the material collection component through the conveying component for collection.

[0012] Preferably, in Step Four, at the front end of the drying unit, the aperture of the microporous air guide plate is 3 cm to improve the drying efficiency. At the middle and rear ends of the drying unit, the aperture of the microporous air guide plate is 1 cm. At the same time, by continuously adjusting the relative angle between the microporous air guide plate at the middle and rear ends and the blowing direction, the microporous air guide plate realizes different degrees of dispersion of the air volume to ensure the overall drying effect of the printed surface of the material.

[0013] Preferably, in Step Three, whether the printing requirements are met is observed through the camera to judge whether there are defects such as missing printing, blurring, offset, color difference, and mutilation in the pre-printed content.

[0014] Preferably, before each printing, a pulsed pressure change is generated inside the negative pressure pipe through the negative pressure pump on the negative pressure pipe to clean the residual ink inside the inkjet head.

[0015] A printing device is applied to the printing method of high-speed intelligent digital printing described above. The printing device includes: a frame, which has a cavity inside; a conveying component arranged in the cavity for conveying materials; a material collection component arranged on one side of the frame for collecting the materials after inkjet printing; and further includes: an inkjet printing component arranged inside the cavity for inkjet printing on the materials. The inkjet printing component includes: a fixing member arranged inside the cavity of the frame;

[0016] An inkjet component slidably arranged on the fixing member so as to reciprocate along the width direction of the material;

[0017] Wherein, an ink inlet pipe and a negative pressure pipe are arranged on the inkjet component. A control valve I is arranged on the negative pressure pipe, a control valve II is arranged on the ink inlet pipe. The end of the negative pressure pipe is provided with a collection box communicated with the negative pressure pipe, and a negative pressure pump is arranged on the negative pressure pipe.

[0018] Preferably, the inkjet component includes: a plurality of inkjet heads. Nozzles are arranged on the surface of each inkjet head facing the conveying component, and heating components are arranged on each inkjet head.

[0019] An identification module for determining whether there is material on the workbench;

[0020] Wherein, each nozzle is connected to an ink inlet pipe and a negative pressure pipe, and the identification module is configured as a camera, and the camera is communicatively connected to an external control terminal.

[0021] Preferably, it further includes: a drying unit arranged on the frame and located in the downstream direction of the inkjet printing assembly, and the drying unit includes: a resistance wire, and a blower arranged above the resistance wire;

[0022] Wherein, the air outlet of the blower is located directly above the conveying assembly, and the length of the air outlet of the blower is adapted to the width of the conveying assembly.

[0023] Preferably, it further includes: a plurality of microporous air guide plates arranged at the air outlet.

[0024] Preferably, the nozzles of the inkjet head are configured to have a tapered stepped structure that is larger at the top and smaller at the bottom in space.

[0025] Preferably, the inkjet component is arranged on a fixing member through a liftable component, and the liftable component is in driving connection with the fixing member through a guide rail assembly arranged on the fixing member;

[0026] Wherein, the liftable component is configured as a telescopic cylinder, and the output end of the telescopic cylinder is connected to the inkjet component.

[0027] The present invention has at least the following beneficial effects: 1. Different cleaning methods are adopted according to the downtime of the device. When the downtime is less than 3 hours, the waste liquid is directly cleaned with a negative pressure pump. The process is simple and efficient, and the residual waste liquid in the inkjet head can be quickly removed, avoiding its drying and blocking the nozzle, reducing the risk of nozzle damage, and extending the service life; when the downtime is greater than 3 hours, it is first heated and then cleaned with a negative pressure pump. Heating can melt and loosen the dried or viscous waste liquid, making the cleaning more thorough, ensuring the nozzle is unobstructed, and providing guarantee for subsequent stable printing;

[0028] 2. Through the pulsed adsorption of the negative pressure pipe, when the nozzle is blocked, the nozzle can be quickly conducted;

[0029] 3. The heating component arranged at the nozzle can heat and melt the blocked air-dried material, and cooperate with the adsorption of the negative pressure pipe to strengthen the conduction effect of the nozzle;

[0030] 4. By arranging a plurality of microporous air guide plates at the air blowing port, the angles of the microporous air guide plates are adjusted at different drying stages to ensure the drying efficiency of the material.

[0031] Other advantages, objectives and features of the present invention will be partially reflected by the following description, and partially will also be understood by those skilled in the art through the research and practice of the present invention. Brief Description of the Drawings

[0032] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 is a schematic diagram of the structures of the inkjet component, guide rail assembly and liftable component of the present invention;

[0034] Figure 3 is a schematic diagram of the structure of the drying unit;

[0035] Figure 4 is a schematic diagram of the spatial structures of the microporous air guide plate, gear and rack;

[0036] Figure 5 is a cross-sectional view of the inkjet head;

[0037] Figure 6 is a schematic diagram of the spatial structures of the moisture retention component and the inkjet component.

[0038] Reference numerals: 1, frame; 2, conveying component; 3, material receiving component; 4, inkjet printing component; 41, fixing piece; 411, guide rail assembly; 42, inkjet component; 421, inkjet head; 422, nozzle; 423, identification module; 43, ink inlet pipe; 44, negative pressure pipe; 5, drying unit; 51, fan; 52, resistance wire; 53, microporous air guide plate; 54, gear; 55, rack; 56, telescopic cylinder; 57, heating component; 58, mounting piece; 59, moisture retention component. Detailed Description of the Invention

[0039] The following further describes the present invention in detail with reference to the drawings so that those skilled in the art can implement it according to the description in the specification.

[0040] It should be understood that the terms such as "having", "including" and "comprising" used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0041] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0042] In the description of the present invention, unless otherwise clearly specified and defined, terms such as "installation", "provided with", "sheathed / connected", "connection", etc. shall be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, an electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, in the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on the top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under the bottom of" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0044] Figure 1 A printing method using high-speed intelligent digital printing according to the present invention is shown, including:

[0045] Step 1, the startup preparation stage before printing:

[0046] Step 2, place the material to be printed on the conveying component 2, and convey the material to below the inkjet printing component 4 through the conveying component 2;

[0047] Step 3, in the printing stage, first call the file to be printed for pre-printing. According to different printing files, select different inks, the printing length is less than 10 cm, and observe whether the pre-printed content meets the printing requirements through a camera. If it meets the requirements, call the file to be printed again for normal printing. If it does not meet the requirements, return to Step 3 again;

[0048] S30, after each printing is completed, judge based on the viscosity of the ink. If the viscosity of the ink is greater than the preset value, enter S31, otherwise directly enter S32;

[0049] S31, switch the working state of the heating component 57 at the inkjet head 421, heat the inner wall of the inkjet head 421 to 50 °C, heat the ink at the inner wall of the inkjet head 421 to reduce its viscosity,

[0050] S32, open the control valve I on the negative pressure pipe 44, close the control valve II on the ink inlet pipe 43, clean the waste liquid remaining inside the inkjet head 421 through the negative pressure pump, and discharge the waste liquid into the collection box;

[0051] Step 4: The drying unit 5 dries the printed material, and the conveying component 2 conveys the dried material to the material receiving component 3 for collection.

[0052] Working principle:

[0053] Step 1: Before printing, turn on the machine and prepare. Clean the foreign objects on the surface of the device workbench.

[0054] Step 2: Material transmission

[0055] Using the mechanical transmission of the conveying component 2, the material to be printed placed thereon is stably conveyed to the specified position below the inkjet printing component 4 to prepare for inkjet printing.

[0056] Step 3: Printing process

[0057] Call the file to be printed for short-length (less than 10 cm) pre-printing. Through small-scale printing, the printing effect of the printing equipment under the current state can be quickly detected, reducing the risk of problems during formal printing.

[0058] S30, after each printing ends, perform processing based on the viscosity of the ink. If the viscosity of the ink is greater than the preset value, the preset value of the ink is 15 - 20 mPa·s (at room temperature), then enter S31, otherwise enter S32;

[0059] S31, switch the working state of the heating component 57 at the inkjet head 421, heat the inner wall of the inkjet head 421 to 50 °C, the heating time is 15 s, heat the ink at the inner wall of the inkjet head 4221 to reduce its viscosity. Heating makes the viscous ink heat up, the viscosity decreases, and the fluidity increases. Then generate negative pressure through the negative pressure pump, and suction and discharge the waste liquid after heat treatment from the inkjet head 421 to ensure the smoothness of the inkjet head 421;

[0060] S32, open the control valve Ⅰ on the negative pressure pipe 44, close the control valve Ⅱ on the ink inlet pipe 43, then generate negative pressure through the negative pressure pump, and suction and discharge the waste liquid after heat treatment from the inkjet head 421 to ensure the smoothness of the inkjet head 421;

[0061] Step 4: Post-treatment

[0062] The drying unit 5 uses the principle of heat transfer to transfer heat to the printed material, so that the solvent in the printing ink quickly volatilizes and solidifies, ensuring that the printed pattern firmly adheres to the surface of the material; through the continuous transmission of the conveying component 2, the dried material is conveyed to the material receiving component 3.

[0063] In the above solution, in step four, at the front end of the drying unit 5, the aperture of the microporous air guide plate 53 is 0.5 cm, which improves the drying efficiency. At the middle and rear ends of the drying unit 5, the aperture of the microporous air guide plate 53 is 0.3 cm. At the same time, by continuously adjusting the relative angle between the microporous air guide plate 53 and the blowing direction, the microporous air guide plate 53 continuously scatters the air volume, ensuring the overall drying effect of the printed surface of the material. With this technical solution, the aperture of the micro air guide plate at the front end of the drying unit 5 is large, enabling the hot air to blow more concentratedly and smoothly towards the printed surface of the material. This method reduces the scattering loss of the hot air during transmission, allows the hot air energy to act more efficiently on the material, accelerates the volatilization of the solvent in the ink, and thus speeds up the overall drying speed and improves production efficiency. At the middle and rear ends of the drying unit 5, the aperture of the microporous air guide plate 53 is 0.3 cm, scattering the air volume more. This can make the hot air cover the printed surface of the material more evenly, avoiding local overheating or insufficient drying. Especially for some materials with irregular shapes or large areas, it can effectively ensure the overall drying effect of their printed surfaces and improve the quality stability of printed products.

[0064] In the above solution, in step three, whether the printing requirements are met is judged by observing with a camera to determine whether there are defects such as missing printing, blurring, offset, color difference, and mutilation in the pre-printed content. With this technical solution,

[0065] Let the standard image (without missing printing) be S(i, j), and the actual printed image be T(i, j), both of which are m×n pixel matrices, and the gray value of the medium background color is B (for example, for a white medium, B = 255, 8-bit gray scale).

[0066] Missing printing pixel determination condition: Missing printing(i, j) = {1, if ∣T(i, j) - S(i, j)∣ > Th and T(i, j) ≈ B, otherwise Missing printing(i, j) = 0;

[0067] Th: Gray scale difference threshold (set according to ink concentration and medium reflectance, usually 10 ≤ Th ≤ 50).

[0068] “T(i, j) ≈ B” can be determined by an interval (such as T(i, j) ∈ [B - 10, B + 10]) to exclude abnormalities that are not missing printing (such as gray scale deviation caused by ink diffusion).

[0069] Missing printing rate calculation formula

[0070] Rv = (∑i = 1m ∑j = 1n Missing printing(i, j)) / (m × n) × 100%

[0071] Rv: Visual inspection missing printing rate, reflecting the proportion of missing printing pixels at the image level.

[0072] Dynamic threshold optimization

[0073] When detecting gradient colors or fine patterns, the traditional fixed threshold Th is prone to misjudgment. A local adaptive threshold Th(i, j) can be introduced: Th(i, j) = μ S (i, j) + λ * σ S (i, j)

[0074] μ S (i, j): The average gray value of the local neighborhood (such as a 3×3 pixel) centered at (i, j) in the standard image;

[0075] σ S (i, j): The standard deviation of the gray value of the local neighborhood, reflecting the pattern complexity;

[0076] λ: Adaptive coefficient (usually 1.0 ≤ λ ≤ 2.0, a larger value is taken for complex patterns);

[0077] Dynamically adjust the gray tolerance for detecting missing printing according to the local characteristics of the pattern to reduce misjudgment caused by texture details. By judging the missing printing rate, it is possible to timely detect problems such as missing printing during pre-printing. If problems such as missing printing occur, return to step one and reprocess the inkjet head 421 until the pre-printed content meets the requirements.

[0078] In the above solution, before each printing, a pulsed pressure change is generated inside the negative pressure tube 44 through the negative pressure pump on the negative pressure tube 44 to clean the residual ink inside the inkjet head 421. With this technical solution, the negative pressure pump starts working before each printing. When the negative pressure pump is started, it creates a pulsed pressure change inside the negative pressure tube 44. Since the negative pressure tube 44 is connected to the inkjet head 421, this pulsed negative pressure change can generate a suction force inside the inkjet head 421. The residual ink inside the inkjet head 421 is gradually sucked out from the nozzles and internal channels of the inkjet head 421 and guided along the negative pressure tube 44 to the collection box. Compared with a continuously stable negative pressure, the pulsed pressure change can more effectively loosen and adsorb the residual ink adhering to the inner wall and nozzles of the inkjet head 421, reduce the ink residue, and minimize the impact on subsequent printing. Through such redundant settings, it can be ensured that the inkjet head 421 of the device is not easily blocked during operation.

[0079] It further includes: A piezoelectric pressure sensor is provided on the ink supply pipeline. This sensor can be configured as a P300 pressure transmitter to stabilize the ink supply pressure within the range of 25 ± 2 kPa through the PID algorithm. When it is detected that the pressure fluctuation exceeds ±5 kPa, the printing is immediately paused, and at the same time, the control valve II is closed, and the inkjet head of the inkjet printing assembly is moved into the moisturizing assembly, and the control valve I is opened. The inside of the inkjet head is flushed through the pulsed negative pressure of the negative pressure pump.

[0080] A printing device is applied to the printing method using high-speed intelligent digital printing. The printing device includes: a frame 1, which has a cavity inside; a conveying component 2 arranged inside the cavity for conveying materials; a material receiving component 3 arranged on one side of the frame 1 for collecting the materials after inkjet printing. It further includes: an inkjet printing component 4 arranged inside the cavity for inkjet printing the materials. The inkjet printing component 4 includes: a fixing part 41 arranged inside the cavity of the frame 1;

[0081] An inkjet part 42 slidably arranged on the fixing part 41 so as to reciprocate along the width direction of the material;

[0082] Wherein, an ink inlet pipe 43 and a negative pressure pipe 44 are arranged on the inkjet part 42. A control valve I is arranged on the negative pressure pipe 44, a control valve II is arranged on the ink inlet pipe 43. The end of the negative pressure pipe 44 is provided with a collection box communicated with the negative pressure pipe 44, and a negative pressure pump is arranged on the negative pressure pipe 44.

[0083] Working principle:

[0084] When the printing work starts, the material to be printed enters the inside of the cavity of the frame 1 through the conveying component 2. The conveying component 2 continuously and stably conveys the material in a specific direction. The inkjet part 42 is slidably arranged on the fixing part 41 and can reciprocate along the width direction of the material. When the device starts the printing task, according to the preset printing pattern and program instructions, the inkjet part 42 moves on the fixing part 41. During normal printing, the control valve II on the ink inlet pipe 43 is opened, and the control valve I on the negative pressure pipe 44 is closed. Ink is continuously conveyed to the inkjet part 42 through the ink inlet pipe 43 to ensure that the inkjet part 42 has sufficient ink for printing work. Before each printing work starts, to ensure the cleanliness inside the inkjet head 421, first open the control valve I on the negative pressure pipe 44 and close the control valve II on the ink inlet pipe 43. At this time, a pulsed pressure change is generated inside the negative pressure pipe 44. Or when the inkjet part is blocked, the above method is also adopted to clean out the residual waste inside the inkjet head 421 and discharge it into the collection box communicated with the negative pressure pipe 44. After each printing is completed, a pulsed pressure change is generated again through the negative pressure pump on the negative pressure pipe 44 to absorb and clean the residual ink inside the inkjet head 421, further ensuring the cleanliness of the inkjet head 421 and maintaining good printing performance.

[0085] In the above technical solution, the inkjet part includes: a plurality of inkjet heads 421. Nozzles 422 are arranged on the side of each inkjet head 421 facing the conveying component 2, and heating components 57 are arranged on each inkjet head 421;

[0086] An identification module 423 for judging whether there is a material on the workbench;

[0087] Among them, each nozzle 422 is communicated with an ink inlet pipe 43 and a negative pressure pipe 44. The identification module 423 is configured as a camera, and the camera is communicatively connected to an external control terminal. By adopting this technical method, the heating component 57 provided on each inkjet head 421 plays a key maintenance role throughout the printing process. As described above, before the start of each printing operation, the heating component 57 is activated to quickly raise the temperature to 50°C and maintain it for 15 s. Since inks of different colors vary in composition and physical properties, heating can target the characteristics of various inks, effectively reducing the viscosity of the residual waste inside the inkjet head 421, making it easier to be discharged from the nozzle 422 and the internal channel under the pulsed pressure of the negative pressure pipe 44, ensuring that the nozzle 422 of each inkjet head 421 remains unobstructed, laying a foundation for high-quality printing. At the same time, during a long continuous printing process, the temperature of the ink may change due to environmental factors, etc., affecting the spraying effect. The heating component 57 can appropriately adjust the ink temperature to keep it in the best spraying state, ensuring the stability and uniformity of ink spraying, and further improving the printing quality. It should be noted that the Figure 2 figure only shows a partial spatial schematic diagram of the ink inlet pipe and the negative pressure pipe, and the collection box, the negative pressure pump, and the ink cartridge are all arranged on the fixing member. The connection relationships among the above-mentioned components are all conventional settings in existing inkjet printers, and will not be elaborated here.

[0088] The identification module 423 uses a camera to continuously monitor the condition of the workbench. The camera is communicatively connected to an external control terminal and continuously transmits the captured images of the workbench to the control terminal. When a material enters the workbench area, the camera captures the image information of the material and converts it into an electrical signal for transmission to the control terminal. The control terminal analyzes and processes the image through a built-in image recognition algorithm to quickly and accurately determine key information such as the position, shape, and size of the material. Once it is confirmed that the material is in place, the control terminal immediately sends a start instruction to the inkjet printing assembly 4 and other related components to trigger the printing process. During the printing process, the camera continuously monitors the transmission state of the material. If any abnormalities such as deviation or jamming of the material are found, it will promptly feedback to the control terminal. The control terminal then adjusts the operating parameters of the conveying assembly 2 or pauses the printing process to ensure the smooth progress of the printing work. When the material completes printing and leaves the workbench, the camera detects that the workbench is empty and sends a signal to the control terminal again to prepare for the entry of the next material. This real-time monitoring and feedback mechanism greatly improves the automation degree and operating stability of the printing device, effectively avoiding printing mistakes and equipment failures caused by material abnormalities.

[0089] In the above technical solution, it further includes: a drying unit 5 provided on the frame 1 and located downstream of the inkjet printing assembly 4. The drying unit 5 includes: a heating wire 52, and a blower 51 arranged above the heating wire 52;

[0090] Among them, the air outlet of the blower 51 is located directly above the conveying component 2, and the length of the air outlet of the blower 51 is adapted to the width of the conveying component 2. By adopting this technical method, the drying unit 5 is arranged on the frame 1 and is located in the downstream direction of the inkjet printing component 4, ensuring that the material after inkjet printing can directly enter the drying link. The resistance wire 52 is used as the main heating element, which generates heat after being powered on, raising the temperature of the surrounding air. The blower 51 is located above the resistance wire 52, and its function is to blow the air heated by the resistance wire 52 downward. The air outlet of the blower 51 is precisely located directly above the conveying component 2, and the length of the air outlet is adapted to the width of the conveying component 2, ensuring that the hot air blown out can fully cover the printing surface of the material being conveyed. When the material after inkjet printing enters the lower part of the drying unit 5 at a constant speed through the conveying component 2, the hot air blown out by the blower 51 directly acts on the surface of the material. The hot air comes into full contact with the wet ink on the surface of the material, and heat transfer causes the water in the ink to evaporate rapidly. During this process, the resistance wire 52 continuously generates heat, and the blower 51 continuously blows hot air onto the material, maintaining a high-temperature environment on the surface of the material and accelerating the drying process. Since the air outlet of the blower 51 matches the width of the conveying component 2, all parts of the printing surface of the material can be evenly heated, effectively avoiding the problem of uneven local drying, ensuring that the ink on the entire printing surface can be dried and cured synchronously, and guaranteeing the clarity and stability of the printed pattern.

[0091] In the above technical solution, it further includes: a plurality of microporous air guide plates 53 arranged at the air outlet. By adopting this technical method, the plurality of microporous air guide plates 53 are rotatably arranged at the air outlet through mounting members 58 provided at both ends of the microporous air guide plates 53 (the mounting members 58 are located on both sides of the air outlet). One end of the microporous air guide plate 53 is provided with a gear 54, and a rack 55 meshing with the gear 54 is slidably arranged in one of the mounting members 58. A rotating shaft is provided on the other side of the microporous air guide plate 53, and a mounting hole matching with the rotating shaft is formed in the mounting member 58 on the other side. One end of the rack 55 is driven by a motor gear 54 and slides in the mounting member 58. When the motor (not shown in the figure) is started, the motor gear 54 rotates, driving the rack 55 to slide in the mounting member 58. Since the rack 55 meshes with the gear 54 of the microporous air guide plate 53, the sliding of the rack 55 will drive the microporous air guide plate 53 to rotate around its connection point with the mounting member 58, thereby realizing precise adjustment of the angle of the microporous air guide plate 53. In the initial stage of drying, through motor control, the angle of the microporous air guide plate 53 is made horizontal with the blowing direction. At this time, the hot air can pass through the micropores on the microporous air guide plate 53 in a relatively concentrated and direct manner and blow onto the surface of the material. The concentrated hot air quickly takes away a large amount of moisture on the surface of the material, accelerating the initial drying speed. As the drying enters the middle stage, most of the moisture on the surface of the material has been evaporated, but there may be uneven drying degrees in different regions. At this time, the motor continuously adjusts the rotation direction and speed of the motor gear 54 according to a preset program or sensor feedback, and then changes the sliding direction and distance of the rack 55, so that the relative angle between the microporous air guide plate 53 and the blowing direction continuously changes. The microporous air guide plate 53 continuously scatters the originally concentrated air volume, and the hot air blows onto various parts of the printing surface of the material at different angles and intensities. This adjustment method ensures that the overall printing surface of the material can be evenly heated, achieving a better drying effect and effectively avoiding deformation of the printed pattern caused by local overheating or over-drying;

[0092] Among them, the angle of the microporous air guide plate 53 located in the front section of the drying unit 5 is fixed and perpendicular to the blowing direction. Moreover, the aperture on one side of the microporous air guide plate 53 in the front section of the drying unit 5 is smaller than that on the other side. When the material enters, the air volume coming out of the smaller aperture is smaller, preheating the material, and the aperture at the rear end is larger, which can accelerate the drying of the material. At the same time, the angle of the microporous air guide plate 53 located in the rear section of the drying unit 5 is adjustable, so that its angle can be adjusted according to needs, thereby controlling the drying speed and drying effect of the material.

[0093] In the above technical solution, the nozzle 422 of the inkjet head 421 is configured as a tapered stepped structure that is larger at the top and smaller at the bottom. With this technical method, the nozzle 422 of the inkjet head 421 is a tapered stepped structure that is larger at the top and smaller at the bottom, which is conducive to the flow and injection of ink inside. The larger upper space can be used as a temporary storage and buffer area for ink, which can accommodate more ink and ensure the stability of ink supply during high-speed printing. As the structure gradually shrinks downward, the ink will be squeezed and accelerated to a certain extent during the flow process, so that the ink ejected from the nozzle 422 has a more suitable speed and pressure, thereby ensuring that the ejected ink droplets are more uniform and delicate, and improving the clarity and accuracy of the printed pattern. At the same time, when the ink is squeezed out, the stepped structure has a certain shear force on the ink, making it less likely for the inkjet head 421 to be blocked.

[0094] In the above technical solution, the inkjet component is arranged on the fixed component 41 through the liftable component, and the liftable component is transmission-connected with the fixed component 41 through the guide rail assembly 411 arranged on the fixed component 41;

[0095] The liftable component is configured as a telescopic cylinder 56, and the output end of the telescopic cylinder 56 is connected to the inkjet component. With this technical method, the piston rod of the telescopic cylinder 56 continues to extend or retract to adjust the height of the inkjet head 421 on the inkjet component in space until the inkjet component reaches the target height, ensuring that the inkjet component can flexibly adjust the distance from the material surface according to the material thickness, greatly improving the adaptability and accuracy of printing, and the telescopic cylinder's upward and downward telescopic distance is ±1mm.

[0096] It also includes a moisturizing component 59 arranged on the frame, the moisturizing component is arranged on one side of the column of the guide rail component, and has a working area and a non-working area on the frame, and the width of the conveying component is adapted to the width of the working area, and the moisturizing component is located in the non-working area. The moisturizing component 59 includes: a bottom plate arranged on one side of the column of the guide rail component, a nozzle for moisturizing the inkjet component is provided on the bottom plate, and the nozzle is connected to an external cleaning tank through a provided connecting pipe;

[0097] Among them, absorbent cotton is arranged around the nozzle, and the nozzle is spatially located below the inkjet component. When the inkjet head is moisturized, the inkjet component is moved from the working area to the non-working area through the guide rail assembly, and water is sprayed to the inkjet head of the inkjet component through the nozzle to form water mist (the size of the water mist is determined by the opening size of the nozzle, and by replacing nozzles of different sizes, water mist of different sizes can be sprayed). Part of the water mist can enter the nozzle to moisturize the nozzle, while part of the water mist gathers to form water droplets, which drip on the absorbent cotton and are absorbed.

[0098] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those skilled in the art, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples described herein.

Claims

1. A printing method using high-speed intelligent digital printing, characterized in that: include: Step 1: Preparation before printing; Step 2: placing the material to be printed on the conveying assembly, and transmitting the material to the bottom of the inkjet printing assembly through the conveying assembly; Step 3: In the printing stage, first call the file to be printed for pre-printing. According to different printing files, select different inks. The printing length is less than 10 cm. Use the camera to observe whether the pre-printed content meets the printing requirements. If it does, call the file to be printed again for normal printing. If not, return to step 3 again: S30, after each printing is completed, the viscosity of the ink is judged. If the viscosity of the ink is greater than a preset value, the process proceeds to S31, otherwise the process directly proceeds to S32; S31, switching the working state of the heating component at the inkjet head, heating the inner wall of the inkjet head to 50° C., heating the ink at the inner wall of the inkjet head to reduce its viscosity, S32, opening the control valve I on the negative pressure pipe and closing the control valve II on the ink inlet pipe, cleaning the waste liquid remaining inside the inkjet head through the negative pressure pump, and discharging the waste liquid into the collection box; Step 4: Dry the printed material through the drying unit, and convey the dried material to the material receiving component for collection through the conveying component.

2. The printing method using high-speed intelligent digital printing according to claim 1, characterized in that: In step four, at the front end of the drying unit, the aperture of the microporous air guide plate is 0.5 cm, which speeds up the drying efficiency. At the middle and rear ends of the drying unit, the aperture of the microporous air guide plate is 0.3 cm. At the same time, by continuously adjusting the relative angle between the microporous air guide plates at the middle and rear ends and the blowing wind direction, the microporous air guide plates can achieve different degrees of air dispersion to ensure the overall drying effect of the printed surface of the material.

3. The printing method using high-speed intelligent digital printing according to claim 1, characterized in that: In step three, whether the printing requirements are met is determined by observing the camera to determine whether the pre-printed content has defects such as missing prints, blur, offset, color difference, and incompleteness.

4. The printing method using high-speed intelligent digital printing according to claim 1, characterized in that: Before each printing, the negative pressure pump on the negative pressure tube generates pulsed pressure changes inside the negative pressure tube to clean the residual ink inside the inkjet head.

5. A printing device, applied to the printing method using high-speed intelligent digital printing as claimed in any one of claims 1 to 4, characterized in that: The printing device comprises: a frame, a cavity inside the frame, a conveying assembly arranged in the cavity for conveying materials, and a material receiving assembly arranged on one side of the frame for collecting materials after inkjet printing; and also comprises: an inkjet printing assembly arranged in the cavity for inkjet printing the materials, the inkjet printing assembly comprising: a fixing member arranged in the cavity of the frame; An inkjet component is slidably disposed on the fixed component so as to reciprocate along the width direction of the material; Among them, the inkjet component is provided with an ink inlet tube and a negative pressure tube, the negative pressure tube is provided with a control valve I, the ink inlet tube is provided with a control valve II, the end of the negative pressure tube is provided with a collecting box connected to the negative pressure tube, and the negative pressure tube is provided with a negative pressure pump.

6. The printing device according to claim 5, characterized in that The inkjet component comprises: a plurality of inkjet heads, each of which is provided with a nozzle on a side facing the conveying component, and each of which is provided with a heating component; An identification module to determine whether there is material on the workbench; Wherein, each nozzle is connected with an ink inlet tube and a negative pressure tube, and the identification module is configured as a camera, and the camera is communicatively connected with an external control terminal.

7. The printing device according to claim 5, characterized in that Also includes: A drying unit is arranged on the frame and located in the downstream direction of the inkjet printing assembly, and the drying unit comprises: a resistance wire, and a fan arranged above the resistance wire; The air outlet of the fan is located directly above the conveying assembly, and the length of the air outlet of the fan is adapted to the width of the conveying assembly.

8. The printing device according to claim 7, characterized in that: Also includes: A plurality of microporous air guide plates are arranged at the air outlet.

9. The printing device according to claim 6, characterized in that: The nozzles of the inkjet head are configured in a stepped structure that is larger at the top and smaller at the bottom.

10. The printing device according to claim 5, characterized in that The inkjet component is arranged on the fixed component via a liftable component, and the liftable component is drivingly connected to the fixed component via a guide rail assembly arranged on the fixed component; Wherein, the liftable component is configured as a telescopic cylinder, and the output end of the telescopic cylinder is connected to the inkjet component.

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