Pressure stabilizing type closed material box device

Abstract

The invention relates to a pressure stabilizing type closed material box device, and belongs to the technical field of lithium ion battery pole piece coating, a scraper box of the device is provided with a feed port located at the bottom of the scraper box and a return port located at the top of the scraper box, and the return port is provided with an exhaust port connected with an exhaust pipe and used for discharging bubbles in slurry; according to the method, the removal efficiency of bubbles in the slurry is reflected, real-time quality monitoring driven by empirical data is realized in combination with a gas discharge flow qualified threshold range established in a trial production stage, the content of the bubbles in the slurry can be directly associated with the printing quality, real-time data and the threshold range can be dynamically compared in the production process, and the printing quality can be effectively improved. The printing defect risk is pre-judged in advance; and meanwhile, in cooperation with an abnormal response and closed-loop control mechanism, process parameters can be automatically adjusted or an alarm can be triggered, so that the printing defects such as pits and broken holes caused by bubble residues are effectively avoided, and the stability and the product yield in the coating printing process are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium-ion battery pole piece coating, and in particular to a voltage-stabilizing closed material box device. Background Art

[0002] During the actual operation of existing high-speed coating machines, due to differences in the model and operating status of the pumping equipment, as well as the delivery pressure and flow rate of the slurry, the slurry itself will carry bubbles of varying contents. When the number of bubbles mixed into the slurry increases abnormally during the pumping process, these bubbles enter the coating process with the slurry, are retained and ruptured on the surface of the diaphragm, forming irreparable pits or holes, seriously damaging the integrity and uniformity of the coating, and ultimately leading to a decline in coating quality. At the same time, traditional coating equipment lacks real-time monitoring and active control mechanisms for the gas content of the slurry, and is unable to dynamically adjust the exhaust process according to the bubble content. It is also difficult to achieve timely warning and intervention when the bubble content is abnormal.

[0003] Therefore, there is an urgent need for a new closed material box device with bubble monitoring and exhaust functions to solve the above technical problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a pressure-stabilizing closed material box device to solve the above technical problems.

[0005] To achieve the above object, the present invention provides the following technical solutions: The scraper box is provided with an upper scraper, a lower sealing knife and two sealing foam plates, the upper scraper is located at the upper side of the material storage chamber, the lower sealing knife is located at the lower side of the material storage chamber, and the sealing foam plate is located at the left and right sides of the material storage chamber; it also includes a rotatable anilox roller, one side of the anilox roller is arranged in the material storage chamber, the edges of the upper scraper, the lower sealing knife and the sealing foam plate are in contact with the surface of the anilox roller to form a closed space, the upper scraper and the lower sealing knife are inclined toward the axis direction of the anilox roller, the scraper box is provided with a feeding port at the bottom thereof and a returning port at the top thereof, the returning port is provided with an exhaust port connected to an exhaust pipe, and the anilox roller is provided with a plurality of grooves uniformly distributed along its circumference for accommodating slurry; It also includes a first driving mechanism and a second driving mechanism electrically connected to the control mechanism, wherein the first driving mechanism is used to adjust the spacing distance between the anilox roller and the scraper box; and the second driving mechanism is used to drive the anilox roller to rotate.

[0006] As a preferred technical solution of the present invention, the first driving mechanism is provided with two cylinder driving mechanisms, and the front ends of the piston rods of the two cylinder driving mechanisms are respectively connected to the left and right ends of the scraper box. Under the drive of the cylinder driving mechanism, the scraper box moves the upper scraper and the lower sealing knife on the scraper box horizontally back and forth toward the anilox roller.

[0007] As a preferred technical solution of the present invention, a pressure sensor is provided at the return port for real-time monitoring of the air pressure in the storage chamber; a pressure regulating valve is provided at the exhaust port for real-time adjustment of the air pressure in the storage chamber, and the pressure sensor and the pressure regulating valve are both electrically connected to the control mechanism.

[0008] As a preferred technical solution of the present invention, the upper scraper and the lower sealing knife are both installed on the scraper box through a fine-tuning mechanism with scale markings, which is used to adjust the angle and contact pressure of the upper scraper and the lower sealing knife relative to the surface of the anilox roller.

[0009] As a preferred technical solution of the present invention, the sealing foam plate is detachably mounted on the scraper box, and the edge thereof in contact with the anilox roller is in an arc shape adapted to the surface of the anilox roller.

[0010] As a preferred technical solution of the present invention, the feed port is connected to the feeding mechanism through a supply pipe, and the return port is connected to the feeding mechanism through a reflux pipe. The feeding mechanism, feed port, storage chamber, return port, supply pipe and reflux pipe together constitute a circulation loop of the slurry.

[0011] As a preferred technical solution of the present invention, it also includes a back roller arranged parallel to the anilox roller, forming a coating pressure zone between the back roller and the anilox roller, the back roller supports the printing substrate through the coating pressure zone, and the rotation linear speed of the back roller is synchronized with that of the anilox roller.

[0012] As a preferred technical solution of the present invention, a flow meter is provided at the exhaust port for real-time monitoring of the gas exhaust flow rate in the storage chamber. The gas exhaust flow rate represents the efficiency of removing bubbles in the slurry, and the printing quality of the printing substrate is determined by the efficiency of removing bubbles.

[0013] As a preferred technical solution of the present invention, the gas exhaust flow rate represents the efficiency of removing bubbles from the slurry, and the printing quality of the printing substrate is determined by the efficiency of removing bubbles, which specifically includes the following steps: S1, flow data collection: using a flow meter provided at the exhaust port to collect real-time gas discharge flow data X in the storage chamber; S2. Establishment of a qualified threshold range: Before formal production, conduct trial production under stable operating conditions and collect gas exhaust flow rate data corresponding to multiple batches of printed products that have passed quality inspection. Based on the gas exhaust flow rate data corresponding to the qualified printed products, establish a qualified gas exhaust flow rate threshold range X' that indicates that the slurry gas content meets the standard. The qualified threshold range is adjusted according to different slurry characteristics, environmental conditions, and production process parameters; S3, real-time data comparison: performing real-time comparison on the gas exhaust flow rate data X collected in step S1 with the gas exhaust flow rate qualified threshold range X' established in step S2; S4. Gas content status determination and quality prediction: When the real-time gas exhaust flow rate data X is within the gas exhaust flow rate qualified threshold range X', it is determined that the current slurry gas content meets the requirements and the slurry degassing state is normal, indicating that the printing quality is qualified; when the real-time gas exhaust flow rate data X deviates from the gas exhaust flow rate qualified threshold range X', it is determined that the slurry gas content is abnormal, the slurry degassing process is unstable, and there is a high risk of printing defects.

[0014] S5. Abnormal response and closed-loop control: When the real-time gas exhaust flow rate data X is lower than the lower limit of the gas exhaust flow rate qualified threshold range X', the control mechanism reduces the rotation speed of the anilox roller; when the real-time gas exhaust flow rate data X is higher than the upper limit of the gas exhaust flow rate qualified threshold range X', the control mechanism responds by shutting down the machine and reminding the operator to check whether there is any air leakage in the pressure-stabilized closed material box device. When it is determined that there is a high risk of printing defects, the control mechanism triggers an alarm signal.

[0015] As a preferred technical solution of the present invention, the gas exhaust flow qualified threshold range X' is 0.45L / min to 0.55L / min.

[0016] In summary, compared with the prior art, the beneficial effects of the present invention are as follows: during the cyclic feeding and reflux process of the storage chamber, the internal air pressure will change periodically, and this air pressure difference can accelerate the floating of the bubbles entrained in the slurry. The present invention sets an exhaust port on the top of the closed storage chamber, so that during the circulation of the slurry, the floating bubbles in the slurry are forced to be diverted and discharged. Through the continuous exhaust effect of the exhaust port, the slurry can be fully degassed before entering the anilox roller, which significantly reduces the surface defects such as pits and holes caused by bubble residues. Compared with the traditional method that relies on natural dissipation, active exhaust greatly improves the efficiency of bubble release, This ensures that the slurry is more uniform and dense when transferred to the printing substrate. In addition, by adding a flow meter at the exhaust port and combining the gas exhaust flow qualified threshold range established in the trial production stage, real-time quality monitoring driven by empirical data is achieved. Not only can the bubble content in the slurry be directly related to the printing quality, but the real-time data and the threshold range can be dynamically compared during the production process to predict the risk of printing defects in advance. At the same time, in conjunction with the abnormal response and closed-loop control mechanism, the process parameters can be automatically adjusted or an alarm can be triggered, thereby effectively avoiding printing defects such as pits and holes caused by bubble residues, and significantly improving the stability of the coating and printing process and the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the pressure-stabilizing closed material box device from the front view of the present invention; Figure 2 This is a schematic diagram of the structure of the pressure-stabilizing closed material box device of the present invention from the back perspective; Figure 3 This is a schematic structural diagram of the pressure-stabilizing closed material box device according to the present invention from a side view; Figure 4 for Figure 3 AA cross-sectional view; Figure 5 Schematic diagram of the anilox roller rubbing the slurry on the printing substrate of the present invention; Among them, 1-scraper box, 11-material storage chamber, 12-upper scraper, 13-lower sealing knife, 14-sealing foam plate, 15-feed port, 16-return port, 17-exhaust pipe, 2-anilox roller, 3-first drive mechanism, 4-back roller, 5-printing substrate. DETAILED DESCRIPTION

[0018] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments given here are only used to illustrate and explain the present invention and cannot be used to limit the present invention.

[0019] like Figures 1 to 5As shown, a kind of stable pressure closed material box device includes scraper box 1 and the storage cavity 11 for being arranged on scraper box 1, scraper box 1 is equipped with upper scraper 12, lower sealing knife 13 and two sealing foam boards 14, upper scraper 12 is located in the upper side of storage cavity 11, lower sealing knife 13 is located in the lower side of storage cavity 11, and sealing foam board 14 is located in the left and right sides of storage cavity 11;It also includes rotatable anilox roller 2, one side of anilox roller 2 is arranged in storage cavity 11, the edge of upper scraper 12, lower sealing knife 13 and sealing foam board 14 all are in contact with the surface of anilox roller 2, and form closed space, and upper scraper 12 and lower sealing knife 13 are all inclined to the axis direction of anilox roller 2, scraper box 1 is equipped with feed inlet 15 located in its bottom and back material port 16 located in its top, exhaust port connected with exhaust pipe 17 is opened in back material port 16, and a plurality of recesses for accommodating slurry are opened in anilox roller 2 along its circumferential direction; It also includes first drive mechanism 3 and second drive mechanism electrically connected with control mechanism, first drive mechanism 3 is used for adjusting the interval distance between anilox roller 2 and scraper box 1;Second drive mechanism is used for driving anilox roller 2 to rotate.

[0020] Upper scraper 12, lower sealing knife 13 and two sealing foam boards 14 are in close contact with the surface of anilox roller 2, and are collectively enclosed into a closed storage cavity 11, the cavity surrounds the circumferential surface of anilox roller 2, and slurry is injected through feed inlet 15, and air pressure is adjusted through back material port 16, so that the recesses of anilox roller 2 quantitatively carry slurry in the cavity, wherein upper scraper 12 scrapes off the excess slurry on the surface of anilox roller 2, defines the upper boundary of storage cavity 11, lower sealing knife 13 prevents slurry from leaking, defines the lower boundary of storage cavity 11, and sealing foam board 14 blocks the overflow of slurry from the two ends of anilox roller 2 in the axial direction, and anilox roller 2 is partially immersed in storage cavity 11, the recesses on its surface carry slurry in the rotating process, form a quantitative slurry layer after being scraped flat by upper scraper 12, and are transferred to the outside of storage cavity 11 and printed on the printing substrate 5; Slurry is easy to wrap air to form bubbles in the process of stirring, conveying or filling, if the bubbles enter the recesses of anilox roller 2 along with slurry and are transferred to the printing substrate 5, will cause defects such as pits and broken holes in the coating layer, the exhaust port is additionally arranged in the application, can directly exhaust the gas in storage cavity 11, so that slurry releases the wrapped bubbles in the closed space, especially when slurry circulates, the air pressure change in storage cavity 11 will accelerate the bubbles to float and be exhausted through the exhaust port, avoid the bubbles to remain in the recesses of anilox roller 2, ensure the continuity and integrity of the coating layer from the source.

[0021] As a preferred embodiment of the application, first drive mechanism 3 is provided with two gas cylinder drive mechanisms, the front ends of the piston rods of the two gas cylinder drive mechanisms are respectively connected with the left and right ends of scraper box 1, and scraper box 1 is driven by the gas cylinder drive mechanism to make upper scraper 12 and lower sealing knife 13 on scraper box 1 move horizontally towards anilox roller 2.

[0022] As a preferred embodiment of the present application, a pressure sensor is arranged at the backfeed port 16 for real-time monitoring of the air pressure in the storage cavity 11; a pressure regulating valve is arranged at the exhaust port for real-time adjustment of the air pressure in the storage cavity 11, and the pressure sensor and the pressure regulating valve are electrically connected with the control mechanism.

[0023] The pressure sensor monitors the air pressure in the storage cavity 11 in real time, and the pressure regulating valve adjusts the air pressure in real time. The two cooperate with the control mechanism to ensure that the air pressure in the storage cavity 11 is stable, which is conducive to the stable conveying and coating of the slurry. The stability of the air pressure in the storage cavity 11 is the key to ensuring the uniform distribution and smooth transfer of the slurry. When the air pressure is too high, it may cause the slurry to leak from the seal or the slurry in the groove of the anilox roller 2 to be excessively squeezed, affecting the coating amount. If the air pressure is too low, it may cause the slurry to fail to fill the groove of the anilox roller 2, resulting in uneven coating. The pressure sensor transmits the real-time air pressure data to the control mechanism, which adjusts the air pressure in the storage cavity 11 in a timely manner according to the set air pressure range, ensuring that the air pressure is always in the best state, thereby ensuring the stability of the coating quality.

[0024] As a preferred embodiment of the present application, the upper scraper 12 and the lower sealing knife 13 are installed on the scraper box 1 through a fine adjustment mechanism with a scale mark, for adjusting the angle and contact pressure of the upper scraper 12 and the lower sealing knife 13 relative to the surface of the anilox roller 2.

[0025] The angle and contact pressure of the upper scraper 12 and the lower sealing knife 13 have a direct impact on the coating quality. If the angle is not appropriate, it may cause the scraper to incompletely or excessively remove the slurry. If the contact pressure is too small, it cannot effectively remove the excess slurry, and if the pressure is too large, it may damage the surface of the anilox roller 2. By adjusting the angle and contact pressure of the upper scraper 12 and the lower sealing knife 13, the upper scraper 12 can better scrape the slurry on the surface of the anilox roller 2, ensuring that the amount of slurry transferred to the printing substrate 5 is uniform; at the same time, the sealing property between the lower sealing knife 13 and the anilox roller 2 can be enhanced to prevent slurry leakage, further improving the quality of the coating.

[0026] As a preferred embodiment of the present application, the sealing foam plate 14 is detachably installed on the scraper box 1, and the edge thereof in contact with the anilox roller 2 is arc-shaped to match the surface of the anilox roller 2.

[0027] The seal foam board 14 can be abraded during long-term use. The detachable design makes replacement simple and fast, reduces maintenance cost and downtime, the arc-shaped edge is matched with the surface of the anilox roller 2, increases the contact area, improves the sealing performance, and effectively prevents slurry from leaking from both ends of the axial direction. In addition, the seal foam board 14 has a certain elasticity and can play a buffering role when contacting the anilox roller 2, avoiding damage to the surface of the anilox roller 2 and prolonging the service life of the anilox roller 2.

[0028] As a preferred embodiment of the present application, the feed port 15 is connected to the feeding mechanism through a flow supply pipeline, and the return port 16 is connected to the feeding mechanism through a return flow pipeline. The feeding mechanism, the feed port 15, the storage cavity 11, the return port 16, the flow supply pipeline and the return flow pipeline together constitute a circulating loop of the slurry.

[0029] As a preferred embodiment of the present application, a back roller 4 is further arranged in parallel with the anilox roller 2. The back roller 4 and the anilox roller 2 form a coating nip therebetween. The back roller 4 supports the printing substrate 5 to pass through the coating nip. The rotational linear speed of the back roller 4 is synchronized with that of the anilox roller 2.

[0030] As a preferred embodiment of the present application, a flow meter is arranged at the exhaust port for real-time monitoring of the gas discharge flow rate in the storage cavity 11. The gas discharge flow rate represents the removal efficiency of the gas bubbles in the slurry, and the printing quality of the printing substrate 5 is determined by the removal efficiency of the gas bubbles.

[0031] The gas discharge flow rate is a direct measure of the volume of gas bubbles released by the slurry in the storage cavity 11. When the flow rate is stable within a set range, it indicates that the degassing process is continuously controllable, and the dissolved or entrained gas in the slurry is effectively removed. The newly generated gas bubbles can also be timely discharged, which means that the gas content of the slurry meets the standard, and there is no gas bubble residue in the slurry entering the grooves of the anilox roller 2, so that the pit or broken hole defects caused by the rupture of the gas bubbles can be completely eliminated when transferred to the printing substrate 5.

[0032] When the flow rate suddenly increases, it may indicate that a large amount of air is mixed into the slurry, such as air leakage of the feeding system. When the flow rate continuously decreases to approach zero, it may indicate that the exhaust port is blocked or the gas pressure in the cavity is abnormal. These data can be transmitted to the control mechanism to realize real-time monitoring and intelligent adjustment of the running state of the device, thereby improving the stability and reliability of production.

[0033] As a preferred embodiment of the present application, the gas discharge flow rate represents the removal efficiency of the gas bubbles in the slurry, and the printing quality of the printing substrate 5 is determined by the removal efficiency of the gas bubbles. Specifically, the following steps are included: S1, flow data acquisition: real-time gas discharge flow rate data X in the storage cavity 11 is acquired in real time by the flow meter arranged at the exhaust port; S2. Establishment of qualified threshold range: Before formal production, conduct trial production under stable working conditions, collect gas exhaust flow rate data corresponding to multiple batches of printed products that have passed quality inspection, and establish the qualified gas exhaust flow rate threshold range X' that indicates that the slurry gas content meets the standard based on the gas exhaust flow rate data corresponding to the qualified printed products. The qualified threshold range is adjusted according to different slurry characteristics, environmental conditions and production process parameters; S3, real-time data comparison: performing real-time comparison of the real-time gas exhaust flow rate data X collected in step S1 with the gas exhaust flow rate qualified threshold range X' established in step S2; S4. Gas content status determination and quality prediction: When the real-time gas exhaust flow rate data X is within the gas exhaust flow rate qualified threshold range X', it is determined that the current slurry gas content meets the requirements and the slurry degassing status is normal, indicating that the printing quality is qualified; when the real-time gas exhaust flow rate data X deviates from the gas exhaust flow rate qualified threshold range X', it is determined that the slurry gas content is abnormal, the slurry degassing process is unstable, and there is a high risk of printing defects.

[0034] S5. Abnormal response and closed-loop control: When the real-time gas exhaust flow rate data X is lower than the lower limit of the gas exhaust flow rate qualified threshold range X', the control mechanism reduces the rotation speed of the anilox roller 2. When the real-time gas exhaust flow rate data X is higher than the upper limit of the gas exhaust flow rate qualified threshold range X', the control mechanism responds by shutting down the machine and reminding the operator to check whether there is any leakage in the pressure-stabilized closed material box device. When it is determined that there is a high risk of printing defects, the control mechanism triggers an alarm signal.

[0035] As a preferred embodiment of the present invention, the gas exhaust flow rate qualification threshold value range X' is 0.45 L / min to 0.55 L / min.

[0036] Working Principle: The feeding mechanism delivers the slurry through the feed port 15 via the flow supply pipe to the closed storage chamber 11 formed by the scraper box 1, upper scraper 12, lower sealing blade 13, sealing foam plate 14 and anilox roller 2. The first driving mechanism 3 adjusts the distance between the anilox roller 2 and the scraper box 1 to ensure that each sealing component is in close contact with the anilox roller 2 to form a good seal. The second driving mechanism drives the anilox roller 2 to rotate. During the rotation, the grooves on its surface enter the storage chamber 11 and are filled with slurry. The upper scraper 12 scrapes off excess slurry on the surface of the anilox roller 2, leaving only a fixed amount of slurry in the grooves. The lower sealing blade 13 and sealing foam plate 14 prevent slurry leakage. The air pressure in the storage cavity 11 is monitored by a pressure sensor, and a pressure regulating valve is adjusted in real time under the action of a control mechanism to ensure the stability of the slurry filling, while the gas in the storage cavity 11 is discharged through a gas outlet, and a flow meter monitors the gas discharge flow to reflect the removal efficiency of the bubbles in the slurry and ensure the coating quality, and the excess slurry returns to the feeding mechanism through a reflux pipeline through a return port 16 to form a circulating loop to realize the reuse of the slurry; The anilox roller 2 carrying the quantitative slurry rotates to form a coating nip with the backing roller 4, the backing roller 4 supports the printing substrate 5 to pass through the area, the anilox roller 2 transfers the slurry in the groove to the printing substrate 5 to complete the coating process, and the rotation line speed of the backing roller 4 and the anilox roller 2 is synchronous to ensure the precision and stability of the coating, and the whole process is coordinated and controlled by the control mechanism on each driving mechanism, pressure sensor, pressure regulating valve and flow meter, etc. to realize efficient and stable coating operation.

[0037] It should be understood that the above embodiments are one or more embodiments of the present application, and there are many other embodiments and variations of the present application based on the present application. Without making pioneering innovation, the person skilled in the art can make deformation and modification through the present application, which belongs to the protection scope of the present application.

Claims

1. A pressure-stabilizing closed material box device, characterized in that: The scraper box comprises a scraper box and a material storage chamber provided on the scraper box, wherein an upper scraper, a lower sealing knife and two sealing foam plates are installed on the scraper box, the upper scraper is located on the upper side of the material storage chamber, the lower sealing knife is located on the lower side of the material storage chamber, and the sealing foam plates are located on the left and right sides of the material storage chamber; it also comprises a rotatable anilox roller, one side of the anilox roller is provided in the material storage chamber, the edges of the upper scraper, the lower sealing knife and the sealing foam plate are in contact with the surface of the anilox roller to form a closed space, the upper scraper and the lower sealing knife are inclined toward the axial direction of the anilox roller, the scraper box is provided with a feed port at its bottom and a return port at its top, the return port is provided with an exhaust port connected to an exhaust pipe, and the anilox roller is provided with a plurality of grooves uniformly distributed along its circumference for accommodating slurry; The invention also includes a first driving mechanism and a second driving mechanism electrically connected to the control mechanism, wherein the first driving mechanism is used to adjust the spacing distance between the anilox roller and the doctor box; The second driving mechanism is used to drive the anilox roller to rotate.

2. The pressure-stabilizing sealing device for a material box according to claim 1, characterized in that: The first driving mechanism is provided with two cylinder driving mechanisms, and the front ends of the piston rods of the two cylinder driving mechanisms are respectively connected to the left and right ends of the scraper box. Under the drive of the cylinder driving mechanism, the scraper box moves the upper scraper and the lower sealing knife on the scraper box horizontally back and forth toward the anilox roller.

3. The pressure-stabilizing sealing device for a material box according to claim 1, characterized in that: A pressure sensor is provided at the return port for real-time monitoring of the air pressure in the storage chamber; a pressure regulating valve is provided at the exhaust port for real-time adjustment of the air pressure in the storage chamber, and the pressure sensor and the pressure regulating valve are both electrically connected to the control mechanism.

4. The pressure-stabilizing sealing device for a material box according to claim 1, characterized in that: The upper scraper and the lower sealing knife are both mounted on the scraper box via a fine-tuning mechanism with scale markings, for adjusting the angle and contact pressure of the upper scraper and the lower sealing knife relative to the surface of the anilox roller.

5. The pressure-stabilizing sealing device for a material box according to claim 1, characterized in that: The sealing foam plate is detachably mounted on the scraper box, and the edge of the sealing foam plate in contact with the anilox roller is in an arc shape that matches the surface of the anilox roller.

6. The pressure-stabilizing sealing device for a material box according to claim 1, characterized in that: The feed port is connected to the feed mechanism through a supply pipe, and the return port is connected to the feed mechanism through a reflux pipe. The feed mechanism, feed port, storage chamber, return port, supply pipe and reflux pipe together constitute a circulation loop of the slurry.

7. The pressure-stabilizing sealing device for a material box according to claim 1, characterized in that: It also includes a back roller arranged parallel to the anilox roller, a coating nip area is formed between the back roller and the anilox roller, the back roller supports the printing substrate to pass through the coating nip area, and the rotation linear speed of the back roller is synchronized with that of the anilox roller.

8. The pressure-stabilizing sealing device for a material box according to claim 1, characterized in that: A flow meter is provided at the exhaust port for real-time monitoring of the gas discharge flow rate in the storage chamber. The gas discharge flow rate represents the efficiency of removing bubbles from the slurry, and the printing quality of the printing substrate is determined by the bubble removal efficiency.

9. The pressure-stabilizing sealing device for a material box according to claim 8, characterized in that: The gas exhaust flow rate represents the efficiency of removing bubbles from the slurry. The printing quality of the printing substrate is determined by the efficiency of removing bubbles. The process specifically includes the following steps: S1, flow data collection: using a flow meter provided at the exhaust port to collect real-time gas discharge flow data X in the storage chamber; S2. Establishment of a qualified threshold range: Before formal production, conduct trial production under stable operating conditions and collect gas exhaust flow rate data corresponding to multiple batches of printed products that have passed quality inspection. Based on the gas exhaust flow rate data corresponding to the qualified printed products, establish a qualified gas exhaust flow rate threshold range X' that indicates that the slurry gas content meets the standard. The qualified threshold range is adjusted according to different slurry characteristics, environmental conditions, and production process parameters; S3, real-time data comparison: performing real-time comparison on the gas exhaust flow rate data X collected in step S1 with the gas exhaust flow rate qualified threshold range X' established in step S2; S4. Gas content status determination and quality prediction: When the real-time gas discharge flow rate data X is within the gas discharge flow rate qualified threshold range X', it is determined that the current slurry gas content meets the requirements and the slurry degassing state is normal, indicating that the printing quality is qualified; when the real-time gas discharge flow rate data X deviates from the gas discharge flow rate qualified threshold range X', it is determined that the slurry gas content is abnormal, the slurry degassing process is unstable, and there is a high risk of printing defects; S5. Abnormal response and closed-loop control: When the real-time gas exhaust flow rate data X is lower than the lower limit of the gas exhaust flow rate qualified threshold range X', the control mechanism reduces the rotation speed of the anilox roller; when the real-time gas exhaust flow rate data X is higher than the upper limit of the gas exhaust flow rate qualified threshold range X', the control mechanism responds by shutting down the machine and reminding the operator to check whether there is any air leakage in the pressure-stabilized closed material box device. When it is determined that there is a high risk of printing defects, the control mechanism triggers an alarm signal.

10. The pressure-stabilizing sealing device for a material box according to claim 9, characterized in that: The gas discharge flow qualified threshold range X' is 0.45L / min to 0.55L / min.

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