A pressure-stable closed cartridge device

Abstract

The application relates to a stable voltage type closed material box device, which belongs to the technical field of lithium ion battery pole piece coating. A feeding port is arranged at the bottom of a scraper box of the device, and a material returning port is arranged at the top of the device. An exhaust port connected with an exhaust pipe is arranged on the material returning port, which is used for exhausting air bubbles in slurry. The exhaust flow of gas is monitored through a flow meter, the removal efficiency of air bubbles in the slurry is reflected, and a qualified threshold range of the exhaust flow of gas is established in the trial production stage. Real-time quality monitoring driven by empirical data is realized. The bubble content in the slurry is directly related to the printing quality. Moreover, the real-time data and the threshold range can be dynamically compared in the production process, and the printing defect risk can be predicted in advance. Meanwhile, in cooperation with an abnormal response and a closed-loop control mechanism, process parameters can be automatically adjusted or an alarm can be triggered, so that printing defects such as pits and broken holes caused by residual bubbles can be effectively avoided, and the stability of the coating and printing process and the product yield are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium ion battery pole piece coating, in particular to a stable pressure type closed material box device. BACKGROUND

[0002] In the actual operation process of the existing high-speed coating machine, due to the differences in the type, running state of the pumping equipment, and the conveying pressure and flow rate of the slurry, the slurry itself will carry different amounts of air bubbles. When the number of air bubbles mixed in the slurry abnormally increases during pumping, these air bubbles will enter the coating link with the slurry, stay on the surface of the film and break, forming irreparable pits or broken holes, which seriously damages the integrity and uniformity of the coating, and ultimately leads to a decrease in coating quality. At the same time, the traditional coating equipment lacks a real-time monitoring and active control mechanism for the air content of the slurry, cannot dynamically adjust the exhaust process according to the air bubble content, and also cannot achieve timely warning and intervention when the air bubble content is abnormal.

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

[0004] The purpose of the present application is to provide a stable pressure type closed material box device to solve the above technical problems.

[0005] To achieve the above purpose, the present application provides the following technical scheme:

[0006] A stable pressure type closed material box device, comprising a scraper box and a storage cavity provided on the scraper box, an upper scraper, a lower sealing knife and two sealing foam boards are installed on the scraper box, the upper scraper is located on the upper side of the storage cavity, the lower sealing knife is located on the lower side of the storage cavity, and the sealing foam boards are located on the left and right sides of the storage cavity; further comprising a rotatable anilox roller, one side of the anilox roller is provided in the storage cavity, the edges of the upper scraper, the lower sealing knife and the sealing foam boards are in contact with the surface of the anilox roller, forming a closed space, the upper scraper and the lower sealing knife are inclinedly arranged towards the axis direction of the anilox roller, the scraper box is provided with a feeding port at the bottom thereof and a return port at the top thereof, the return port is provided with an exhaust port connected with an exhaust pipe, and a plurality of grooves for accommodating the slurry are uniformly distributed along the circumference of the anilox roller;

[0007] Further comprising a first driving mechanism and a second driving mechanism electrically connected with the control mechanism, the first driving mechanism is used for adjusting the interval distance between the anilox roller and the scraper box; and the second driving mechanism is used for driving the anilox roller to rotate.

[0008] As a preferred technical scheme of the present application, the first driving mechanism is provided with two cylinder driving mechanisms, the front ends of the piston rods of the two cylinder driving mechanisms are respectively connected with the left and right ends of the scraper box, and the scraper box is driven by the cylinder driving mechanisms to make the upper scraper and the lower sealing knife on the scraper box move horizontally and reciprocally towards the anilox roller.

[0009] As a preferred technical scheme of the present application, a pressure sensor is arranged at the return port for monitoring the air pressure in the storage cavity in real time, a pressure regulating valve is arranged at the exhaust port for regulating the air pressure in the storage cavity in real time, and the pressure sensor and the pressure regulating valve are electrically connected with the control mechanism.

[0010] As a preferred technical scheme of the present application, the upper scraper and the lower sealing knife are installed on the scraper box through fine adjustment mechanisms with scale marks for adjusting the angle and contact pressure of the upper scraper and the lower sealing knife relative to the surface of the anilox roller.

[0011] As a preferred technical scheme of the present application, the sealing foam plate is detachably installed on the scraper box, and the edge thereof in contact with the anilox roller is in the shape of an arc matching the surface of the anilox roller.

[0012] As a preferred technical scheme of the present application, the feeding port is connected to a feeding mechanism through a flow supply pipeline, the return port is connected to the feeding mechanism through a return flow pipeline, and the feeding mechanism, the feeding port, the storage cavity, the return port, the flow supply pipeline and the return flow pipeline together constitute a circulating loop of the slurry.

[0013] As a preferred technical scheme of the present application, a backing roller is further arranged in parallel with the anilox roller, a coating nip is formed between the backing roller and the anilox roller, the backing roller supports the printing substrate to pass through the coating nip, and the rotational linear speed of the backing roller is synchronous with that of the anilox roller.

[0014] As a preferred technical scheme of the present application, a flow meter is arranged at the exhaust port for monitoring the gas discharge flow in the storage cavity in real time, the gas discharge flow represents the removal efficiency of the bubbles in the slurry, and the printing quality of the printing substrate is determined by the removal efficiency of the bubbles.

[0015] As a preferred technical scheme of the present application, the gas discharge flow represents the removal efficiency of the bubbles in the slurry, and the printing quality of the printing substrate is determined by the removal efficiency of the bubbles, and the method comprises the following steps:

[0016] S1, flow data acquisition: real-time gas discharge flow data X in the storage cavity is acquired in real time through the flow meter arranged at the exhaust port;

[0017] S2, qualified threshold range establishment: before formal production, trial production under stable working condition is carried out, the gas discharge flow data corresponding to the qualified printing products of multiple batches confirmed by quality detection is collected, and the gas discharge flow qualified threshold range X' representing that the gas content of slurry meets the standard is established based on the gas discharge flow data corresponding to the qualified printing products, and the qualified threshold range is adjusted according to different slurry characteristics, environmental conditions and production process parameters;

[0018] S3, real-time data comparison: the real-time gas discharge flow data X collected in step S1 is compared with the gas discharge flow qualified threshold range X' established in step S2 in real time;

[0019] S4, gas content state determination and quality prediction: when the real-time gas discharge flow data X is within the gas discharge flow qualified threshold range X', it is determined that the current gas content of the slurry meets the requirements, the slurry degassing state is normal, and it is predicted that the printing quality is qualified; when the real-time gas discharge flow data X deviates from the gas discharge flow qualified threshold range X', it is determined that the gas content of the slurry is abnormal, the slurry degassing process is unstable, and there is a high risk of printing defects.

[0020] S5, abnormal response and closed-loop control: when the real-time gas discharge flow data X is lower than the lower limit of the gas discharge flow qualified threshold range X', the control mechanism reduces the rotating speed of the anilox roller; when the real-time gas discharge flow data X is higher than the upper limit of the gas discharge flow qualified threshold range X', the control mechanism stops and responds, reminding the operator to check whether there is air leakage in the constant pressure type closed material box device, and when it is determined that there is a high risk of printing defects, the control mechanism triggers an alarm signal.

[0021] As a preferred technical scheme of the present application, the gas discharge flow qualified threshold range X' is 0.45L / min-0.55L / min.

[0022] Compared with the prior art, the application has the beneficial effects that: during the circulation and backflow of the storage cavity, the internal air pressure will periodically change, and the air bubbles entrained in the slurry can be accelerated to float up by the air pressure difference. The application sets an exhaust port at the top of the closed storage cavity, so that the floating air bubbles in the slurry are forced to flow and discharge during the circulation of the slurry. Through the continuous exhaust effect of the exhaust port, the slurry can be fully degassed before entering the anilox roller, and the surface defects such as pits and broken holes caused by residual air bubbles are significantly reduced. Compared with the traditional natural dissipation method, the active exhaust greatly improves the efficiency of air bubble release, and 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 with the gas discharge flow threshold range established during the trial production stage, real-time quality monitoring driven by empirical data is realized, which not only directly relates the air bubble content in the slurry to the printing quality, but also dynamically compares the real-time data with the threshold range during the production process to predict the risk of printing defects in advance. At the same time, combined with the abnormal response and closed-loop control mechanism, the process parameters can be automatically adjusted or an alarm can be triggered, so as to effectively avoid the printing defects such as pits and broken holes caused by residual air bubbles, and significantly improve the stability and product yield of the coating and printing process. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a front view of the stable pressure type closed material box device;

[0024] Figure 2 is a rear view of the stable pressure type closed material box device;

[0025] Figure 3 is a side view of the stable pressure type closed material box device;

[0026] Figure 4 is an A-A sectional view of Figure 3 ;

[0027] Figure 5 is a schematic diagram of the anilox roller transferred slurry on the printing substrate;

[0028] Wherein, 1 - doctor blade box, 11 - storage cavity, 12 - upper doctor blade, 13 - lower sealing knife, 14 - sealing foam board, 15 - feeding port, 16 - backflow port, 17 - exhaust pipe, 2 - anilox roller, 3 - first driving mechanism, 4 - backing roller, 5 - printing substrate. DETAILED DESCRIPTION

[0029] The specific embodiments of the application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments given here are only for illustration and explanation of the application, and cannot be used to limit the application.

[0030] As Figures 1 to 5As shown, a kind of pressure-stabilized 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 contact with the surface of anilox roller 2, to form closed space, 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 at its bottom and return material port 16 located at its top, exhaust port connected with exhaust pipe 17 is opened on return material port 16, and a plurality of grooves for accommodating slurry are opened on anilox roller 2 and are uniformly distributed along the circumferential direction of anilox roller 2;

[0031] It also includes first driving mechanism 3 and second driving mechanism electrically connected with control mechanism, first driving mechanism 3 is used to adjust the interval distance between anilox roller 2 and scraper box 1;Second driving mechanism is used to drive anilox roller 2 to rotate.

[0032] 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 part of the circumferential surface of anilox roller 2, and slurry is injected through feed inlet 15 and air pressure is adjusted through return material port 16, so that the grooves 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, part of anilox roller 2 is immersed in storage cavity 11, the grooves on the surface of anilox roller 2 carry slurry in the rotating process, form a quantitative slurry layer after being scraped flat by upper scraper 12, and are transferred out of storage cavity 11 and printed on the printing substrate 5;

[0033] Slurry is easy to wrap air bubbles in the process of stirring, conveying or filling, if the air bubbles enter the grooves of anilox roller 2 along with the slurry and are transferred to the printing substrate 5, it will cause defects such as pits and broken holes in the coating layer, the present application adds exhaust port, which can directly exhaust the gas in storage cavity 11, so that the air bubbles wrapped in the slurry are released in the closed space, especially when the slurry circulates, the change of air pressure in storage cavity 11 will accelerate the floating of air bubbles and the exhaust of air bubbles through exhaust port, avoiding the residual of air bubbles in the grooves of anilox roller 2, to ensure the continuity and integrity of the coating layer from the source.

[0034] As a preferred embodiment of the present application, the first driving mechanism 3 is provided with two cylinder driving mechanisms, and the front ends of the piston rods of the two cylinder driving mechanisms are respectively connected with the left and right ends of the doctor blade box 1. The doctor blade box 1 is driven by the cylinder driving mechanisms to make the upper doctor blade 12 and the lower sealing blade 13 on the doctor blade box 1 make horizontal reciprocating motion towards the anilox roller 2.

[0035] As a preferred embodiment of the present application, a pressure sensor is arranged at the material return port 16 for monitoring the air pressure in the storage cavity 11 in real time; a pressure regulating valve is arranged at the exhaust port for regulating the air pressure in the storage cavity 11 in real time, and the pressure sensor and the pressure regulating valve are electrically connected with the control mechanism.

[0036] The pressure sensor monitors the air pressure in the storage cavity 11 in real time, and the pressure regulating valve regulates 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 beneficial to the stable conveying and coating of the slurry. The stable air pressure in the storage cavity 11 is the key to ensure the uniform distribution and smooth transfer of the slurry. When the air pressure is too high, the slurry may leak from the sealing part, or the slurry in the groove of the anilox roller 2 may be excessively squeezed, affecting the coating amount. When the air pressure is too low, the slurry may not be able to fill the groove of the anilox roller 2 smoothly, and uneven coating may occur. The pressure sensor transmits the real-time air pressure data to the control mechanism, and the control mechanism adjusts the air pressure in the storage cavity 11 in time according to the set air pressure range through the pressure regulating valve, so as to ensure that the air pressure is always in the best state, thereby ensuring the stability of the coating quality.

[0037] As a preferred embodiment of the present application, the upper doctor blade 12 and the lower sealing blade 13 are installed on the doctor blade box 1 through a fine adjustment mechanism with a scale mark, for adjusting the angle and contact pressure of the upper doctor blade 12 and the lower sealing blade 13 relative to the surface of the anilox roller 2.

[0038] The angle and contact pressure of the upper doctor blade 12 and the lower sealing blade 13 have a direct impact on the coating quality. If the angle is not appropriate, the doctor blade may not completely or excessively remove the slurry. If the contact pressure is too small, the excess slurry cannot be effectively removed, and if the contact pressure is too large, the surface of the anilox roller 2 may be damaged. By adjusting the angle and contact pressure of the upper doctor blade 12 and the lower sealing blade 13, the upper doctor blade 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 blade 13 and the anilox roller 2 can be enhanced to prevent slurry leakage, further improving the quality of the coating.

[0039] As a preferred embodiment of the present application, the sealing foam plate 14 is detachably installed on the doctor blade box 1, and the edge of the sealing foam plate 14 in contact with the anilox roller 2 is arc-shaped and matched with the surface of the anilox roller 2.

[0040] 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.

[0041] 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.

[0042] As a preferred embodiment of the present application, a backing roller 4 is arranged in parallel with the anilox roller 2. The backing roller 4 and the anilox roller 2 form a coating nip, the backing roller 4 supports the printing substrate 5 to pass through the coating nip, and the rotational linear speed of the backing roller 4 is synchronized with that of the anilox roller 2.

[0043] 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 bubbles in the slurry, and the printing quality of the printing substrate 5 is determined by the removal efficiency of the bubbles.

[0044] The gas discharge flow rate is a direct measure of the volume of 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, the dissolved or entrained gas in the slurry is effectively removed, and the newly generated bubbles can also be timely discharged, which means that the gas content of the slurry meets the standard, there is no 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 bubbles can be completely eliminated when transferred to the printing substrate 5.

[0045] 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, improve the stability and reliability of production.

[0046] As a preferred embodiment of the present application, the gas discharge flow rate represents the removal efficiency of the bubbles in the slurry, and the printing quality of the printing substrate 5 is determined by the removal efficiency of the bubbles, which specifically includes the following steps:

[0047] S1, flow data acquisition: real-time acquisition of real-time gas discharge flow rate data X in the storage cavity 11 through the flow meter arranged at the exhaust port;

[0048] S2, qualified threshold range establishment: before formal production, carry out trial production under stable working condition, collect the gas discharge flow data corresponding to the qualified printing products of multiple batches confirmed by quality detection, and establish a gas discharge flow qualified threshold range X' representing the gas content of the slurry based on the gas discharge flow data corresponding to the qualified printing products; the qualified threshold range is adjusted according to different slurry characteristics, environmental conditions and production process parameters;

[0049] S3, real-time data comparison: the real-time gas discharge flow data X collected in step S1 is compared with the gas discharge flow qualified threshold range X' established in step S2 in real time;

[0050] S4, gas content state determination and quality prediction: when the real-time gas discharge flow data X is within the gas discharge flow qualified threshold range X', it is determined that the current slurry gas content meets the requirements, the slurry degassing state is normal, and the printing quality is qualified; when the real-time gas discharge flow data X deviates from the gas discharge flow 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.

[0051] S5, abnormal response and closed-loop control: when the real-time gas discharge flow data X is lower than the lower limit of the gas discharge flow qualified threshold range X', the control mechanism reduces the rotating speed of the anilox roller 2; when the real-time gas discharge flow data X is higher than the upper limit of the gas discharge flow qualified threshold range X', the control mechanism stops working and reminds the operator to check whether there is air leakage in the pressure-stabilizing closed material box device; when it is determined that there is a high risk of printing defects, the control mechanism triggers an alarm signal.

[0052] As a preferred embodiment of the present application, the gas discharge flow qualified threshold range X' is 0.45L / min to 0.55L / min.

[0053] Working principle: the feeding mechanism delivers the slurry through the feeding pipeline to the closed storage cavity 11 formed by the scraper box 1, the upper scraper 12, the lower sealing knife 13, the sealing foam board 14 and the anilox roller 2 through the feeding port 15, the first driving mechanism 3 adjusts the interval distance between the anilox roller 2 and the scraper box 1 to ensure that each sealing part is in close contact with the anilox roller 2 to form a good seal, and the second driving mechanism drives the anilox roller 2 to rotate, and the grooves on the surface of the anilox roller 2 enter the storage cavity 11 and fill the slurry in the rotating process, the upper scraper 12 removes the excess slurry on the surface of the anilox roller 2 to leave only the quantitative slurry in the grooves; the lower sealing knife 13 and the sealing foam board 14 prevent the slurry from leaking;

[0054] 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;

[0055] 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.

[0056] 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 an innovative innovation, the person skilled in the art can deform and modify the present application, which belongs to the protection scope of the present application.

Claims

1. A method of operating a regulated closed cartridge device, the method comprising: The utility model provides a kind of printing device, including scraper box and be arranged on the storage cavity of the scraper box, scraper box is equipped with upper scraper, lower seal knife and two sealing foam board, the upper scraper is located in the upper side of the storage cavity, the lower seal knife is located in the lower side of the storage cavity, and the sealing foam board is located in the left and right sides of the storage cavity;It also includes rotatable anilox roller, one side of the anilox roller is arranged in the storage cavity, the edge of the upper scraper, the lower seal knife and the sealing foam board are all in contact with the surface of the anilox roller, to form closed space, the upper scraper and the lower seal knife are all inclined to the axis direction of the anilox roller, scraper box is equipped with feed inlet at its bottom and return material port at its top, the return material port is provided with exhaust port connected with exhaust pipe, the anilox roller is provided with a plurality of grooves for accommodating slurry along its circumferential direction and uniformly distributed; ​ It also includes first driving mechanism and second driving mechanism electrically connected with control mechanism, the first driving mechanism is used to adjust the interval distance between the anilox roller and the scraper box; The second driving mechanism is used to drive the anilox roller to rotate; The exhaust port is provided with a flow meter for real-time monitoring of the gas discharge flow in the storage cavity, the gas discharge flow represents the removal efficiency of gas bubbles in the slurry, and the printing quality of the printing substrate 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 data X in the storage cavity is collected in real time by the flow meter arranged at the exhaust port; S2, qualified threshold range establishment: before formal production, trial production under stable working conditions is carried out, and the gas discharge flow data corresponding to a plurality of batches of qualified printing products confirmed by quality detection is collected, and based on the gas discharge flow data corresponding to the qualified printing products, a gas discharge flow qualified threshold range X' representing that the gas content of the slurry meets the standard is established, and the qualified threshold range is adjusted according to different slurry characteristics, environmental conditions and production process parameters; S3, real-time data ratio: the real-time gas discharge flow data X collected in step S1 is compared with the gas discharge flow qualified threshold range X' established in step S2 in real time; S4, gas content state determination and quality prediction: when the real-time gas discharge flow data X is within the gas discharge flow qualified threshold range X', it is determined that the current gas content of the slurry meets the requirements, the slurry degassing state is normal, and it is predicted that the printing quality is qualified;When the real-time gas discharge flow data X deviates from the gas discharge flow qualified threshold range X', it is determined that the gas content of the slurry 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 data X is lower than the lower limit of the gas exhaust flow qualified threshold range X', the control mechanism reduces the rotational speed of the anilox roller; when the real-time gas exhaust flow data X is higher than the upper limit of the gas exhaust flow qualified threshold range X', the control mechanism triggers a shutdown response to remind the operator to check whether the air leakage phenomenon exists in the constant-pressure closed material box device, and when it is determined that there is a high risk of printing defects, the control mechanism triggers an alarm signal.

2. The method of claim 1, wherein: 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 with the left and right ends of the scraper box. The scraper box drives the upper scraper and the lower sealing knife on the scraper box to move horizontally and reciprocally towards the anilox roller.

3. The method of operating a pressure-stable closure cartridge assembly according to claim 1, wherein: The return port is provided with a pressure sensor for real-time monitoring of the air pressure in the storage cavity, and the exhaust port is provided with a pressure regulating valve for real-time adjustment of the air pressure in the storage cavity. The pressure sensor and the pressure regulating valve are electrically connected with the control mechanism.

4. The method of claim 1, wherein the method further comprises: The upper scraper and the lower sealing knife are installed on the scraper box through a fine adjustment mechanism with a scale mark, 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.

5. The method of claim 1, wherein: The sealing foam plate is detachably installed on the scraper box, and the edge thereof in contact with the anilox roller is arc-shaped and adapted to the surface of the anilox roller.

6. The method of claim 1, wherein: The feeding port is connected to the feeding mechanism through a flow pipe, and the return port is connected to the feeding mechanism through a return pipe. The feeding mechanism, the feeding port, the storage cavity, the return port, the flow pipe and the return pipe together constitute a circulating loop of slurry.

7. The method of claim 1, wherein the method further comprises: A back roller is further arranged in parallel with the anilox roller, and a coating nip is formed between the back roller and the anilox roller. The back roller supports the printing substrate to pass through the coating nip, and the rotational linear speed of the back roller is synchronized with that of the anilox roller.

8. The method of claim 1, wherein: The gas exhaust flow qualified threshold range X' is 0.45 L / min to 0.55 L / min.

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