An auxiliary control system of a coating machine die and a coating machine

Abstract

The application discloses an auxiliary control system of a coating machine die and the coating machine, and relates to the technical field of coating control.The application comprises a feed pressure adjusting device, a discharge gap adjusting device, a coating thickness detection array and a control unit, wherein in a trial production stage, the feed pressure adjusting device pumps slurry to the die with different pump pressure values, the discharge gap adjusting device adjusts the discharge gap width value, and the thickness detection value of each thickness detection unit at each detection time in the trial production stage is recorded synchronously; the target pump pressure value and the target discharge gap width value are obtained according to the thickness detection value of the coating thickness detection array at each detection time under the combination of each pump pressure value and the discharge gap width value in the trial production stage; and the target pump pressure value and the target discharge gap width value are adjusted by the feed pressure adjusting device and the discharge gap adjusting device respectively.The application effectively avoids the disturbance of interference factors on the coating thickness.

Description

Technical Field

[0001] This invention belongs to the field of coating control technology, and in particular relates to an auxiliary control system for a coating machine die head and a coating machine. Background Technology

[0002] Coating technology refers to the process of uniformly applying liquid or semi-solid materials such as adhesives, coatings, and inks to the surface of substrates such as paper, film, fabric, and metal sheet. The coating machine is the key equipment for realizing this technology, and its core component is the coating die, which directly affects the coating quality.

[0003] Traditional coating machine die head control mainly relies on mechanical adjustment and operator experience to control the material discharge gap of the coating machine die head, which makes the coating effect prone to abnormal fluctuations. Summary of the Invention

[0004] The purpose of this invention is to provide an auxiliary control system for a coating machine die head and a coating machine, which effectively avoids disturbances to the coating thickness caused by interference factors by detecting and analyzing the coating thickness and controlling the material discharge gap of the die head.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention provides an auxiliary control system for a coating machine die head, comprising,

[0007] The feeding pressure regulating device is used to regulate the pumping pressure of the slurry pumped by the die head;

[0008] The discharge gap adjustment device is used to control the discharge gap width of the die head;

[0009] The coating thickness detection array includes multiple thickness detection units, which are set perpendicular to the coating discharge direction to detect the coating thickness at each detection moment and obtain the thickness detection value.

[0010] The control unit is used to pump slurry to the die head at different pumping pressure values ​​by the feeding pressure regulating device during the trial production stage, and to adjust the discharge gap width value by the discharge gap regulating device, and to synchronously record the thickness detection value of each thickness detection unit at each detection time during the trial production stage.

[0011] Based on the combination of each pumping pressure value and discharge gap width value during the trial production phase, the coating thickness detection array obtains the target pumping pressure value and target discharge gap width value at each detection time.

[0012] The feed pressure and discharge gap are adjusted to the target pumping pressure and target discharge gap width values ​​respectively by the feed pressure regulating device and the discharge gap regulating device.

[0013] The present invention also discloses a coating machine, comprising,

[0014] A roll release unit is used to release the roll of material to be coated.

[0015] The die head is used to transfer the slurry onto the surface of the roll material;

[0016] The feeding unit is used to pump slurry into the die head;

[0017] The winding unit is used to wind up the coated and dried roll material;

[0018] The feeding pressure regulating device is used to regulate the pumping pressure of the slurry pumped by the die head;

[0019] The discharge gap adjustment device is used to control the discharge gap width of the die head;

[0020] The coating thickness detection array includes multiple thickness detection units, which are set perpendicular to the coating discharge direction to detect the coating thickness at each detection moment and obtain the thickness detection value.

[0021] The control unit is used to pump slurry to the die head at different pumping pressure values ​​by the feeding pressure regulating device during the trial production stage, and to adjust the discharge gap width value by the discharge gap regulating device, and to synchronously record the thickness detection value of each thickness detection unit at each detection time during the trial production stage.

[0022] Based on the combination of each pumping pressure value and discharge gap width value during the trial production phase, the coating thickness detection array obtains the target pumping pressure value and target discharge gap width value at each detection time.

[0023] The feed pressure and discharge gap are adjusted to the target pumping pressure and target discharge gap width values ​​respectively by the feed pressure regulating device and the discharge gap regulating device.

[0024] During the trial production stage, this invention analyzes the thickness detection values ​​under various combinations of pumping pressure values ​​and discharge gap width values ​​using a coating thickness detection array. This yields the target pumping pressure value and target discharge gap width value most suitable for coating production. The invention also controls the feeding pressure adjustment device and the discharge gap adjustment device to adjust synchronously, thereby achieving the technical effect of avoiding disturbances to the coating thickness caused by interfering factors.

[0025] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of an embodiment of the auxiliary control system for a coating machine die head according to the present invention;

[0028] Figure 2 This is a schematic flowchart of the steps of the control unit according to an embodiment of the present invention;

[0029] Figure 3 This is a flowchart illustrating step S2 of the present invention in one embodiment;

[0030] Figure 4 This is a flowchart illustrating step S23 of the present invention in one embodiment;

[0031] Figure 5 This is a flowchart illustrating step S24 of the present invention in one embodiment;

[0032] Figure 6 This is a flowchart illustrating step S241 of the present invention in one embodiment;

[0033] Figure 7 This is a flowchart illustrating step S244 of the present invention in one embodiment;

[0034] Figure 8 This is a flowchart illustrating step S25 of the present invention in one embodiment;

[0035] Figure 9 This is a flowchart illustrating step S251 of the present invention in one embodiment;

[0036] Figure 10 This is a flowchart illustrating step S2513 of the present invention in one embodiment.

[0037] The attached diagram lists the components represented by each number as follows:

[0038] 1- Feeding pressure regulating device, 2- Discharge gap regulating device, 3- Coating thickness detection array, 4- Control unit. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0040] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0041] A coating machine is a device used to coat or coat materials onto the surface of an object. It is widely used in various industrial fields, including paper printing, wood coating, metal coating, and plastic products.

[0042] The working principle of a coating machine is to uniformly distribute coatings or coating materials onto the surface of an object to form a thin film or coating layer. The specific structure and operating method of a coating machine vary depending on different applications and process requirements. However, due to the influence of disturbance factors in the specific environment, the coating thickness may fluctuate, affecting the quality of the product roll material. To maintain a relatively consistent coating uniformity for the product roll material, the feeding pressure and discharge gap of the die head can be adjusted. By coordinating and controlling these two aspects, uniform coating thickness can be achieved while meeting the required coating thickness. In view of this, the present invention provides the following solution.

[0043] Please see Figures 1 to 2 As shown, the present invention provides a coating machine, which generally includes a roll release unit, a die head, a feeding unit, and a winding unit. The roll release unit is used to release the roll of material to be coated, and the die head is used to transfer the slurry onto the surface of the roll. The feeding unit is used to pump the slurry to the die head, and the winding unit is used to wind up the coated and dried roll.

[0044] To control the pumping pressure and discharge gap width in the die head, the coating machine also includes an auxiliary control system for the die head. This system includes a feed pressure regulating device 1, a discharge gap regulating device 2, a coating thickness detection array 3, and a control unit 4. The feed pressure regulating device 1 adjusts the pumping pressure of the slurry pumped into the die head, and the discharge gap regulating device 2 controls the discharge gap width of the die head. The coating thickness detection array 3 includes multiple thickness detection units, arranged perpendicular to the coating discharge direction, used to detect the coating thickness at each detection moment and obtain the thickness detection value.

[0045] Control unit 4 is used during the trial production phase. First, step S1 involves the feeding pressure regulating device pumping slurry to the die head at different pumping pressure values, and the discharge gap regulating device adjusting the discharge gap width. Simultaneously, the thickness detection value of each thickness detection unit at each detection moment is recorded during the trial production phase. Next, step S2 involves using the combination of each pumping pressure value and discharge gap width value during the trial production phase, along with the thickness detection values ​​of the coating thickness detection array at each detection moment, to obtain the target pumping pressure value and target discharge gap width value. Finally, step S3 involves adjusting the feed pressure regulating device and discharge gap regulating device to the target pumping pressure value and target discharge gap width value, respectively.

[0046] Of course, during the formal coating production process, steps S1 to S3 can be executed intermittently to monitor and correct the coating stability during the coating production process.

[0047] Please see Figure 3 As shown, to obtain the target pumping pressure and target discharge gap width values ​​that meet the coating production requirements, step S21 can be executed first to obtain the target coating thickness range, which is input by the operator. Next, step S22 can be executed to obtain the test sequence for each combination of pumping pressure and discharge gap width values, which can also be input by the operator. Next, step S23 can be executed to obtain the detection delay between the die head discharge and the coating thickness detection array thickness detection. This is because there is a positional difference between the coating thickness detection array and the die head, so it is not completely real-time detection. Next, step S24 can be executed to sequentially detect the thickness detection value of each thickness detection unit at each detection moment, corresponding to each combination of pumping pressure and discharge gap width values, based on the target coating thickness range, the detection delay time, and the thickness detection value of each thickness detection unit at each detection moment. Finally, step S25 can be executed to obtain the target pumping pressure and target discharge gap width values ​​based on the thickness detection value of each thickness detection unit at each detection moment, corresponding to each combination of pumping pressure and discharge gap width values. Of course, due to the variability of specific production conditions, the target pumping pressure value and the target discharge gap width value here also need to be continuously fed back and corrected.

[0048] Please see Figure 4As shown, due to the positional difference between the coating thickness detection array and the die head, there is a time difference between the die head's material ejection and the detection time of the coating thickness detection array, which interferes with the analysis and calculation process from steps S1 to S3. To calculate this detection delay, step S23 can first be implemented by obtaining the linear distance between the die head's material ejection gap and the coating thickness detection array as the material ejection detection linear distance. Next, step S232 can be implemented to continuously obtain the material ejection linear velocity at each detection time. Finally, step S233 can be implemented to obtain the detection delay between each detection time of the coating thickness detection array and the corresponding detection time of the material ejection gap based on the material ejection detection linear distance and the material ejection linear velocity at each detection time.

[0049] Please see Figure 5 As shown, since it is necessary to test each combination of pumping pressure value and discharge gap width value, in order to achieve orderly testing and shorten the testing time, step S24 can first be implemented by step S241, which determines whether the discharge coating of the current combination of pumping pressure value and discharge gap width value is laterally uniform based on the positional relationship between each thickness detection unit and the thickness detection value of each thickness detection unit at each testing time. If not, step S242 can be implemented to test the next combination according to the testing order of each combination of pumping pressure value and discharge gap width value. If yes, step S243 can be implemented to continuously acquire the thickness detection value of each thickness detection unit at each testing time. By detecting whether the discharge coating is laterally uniform, it is determined whether the current combination of pumping pressure value and discharge gap width value needs further testing, thereby saving testing time and improving testing efficiency.

[0050] In the subsequent testing process, step S244 can be executed first to obtain the effective thickness detection value of the combination of the current pumping pressure value and the discharge gap width value by continuously acquiring the thickness detection value of each thickness detection unit at each detection time. Next, step S245 can be executed to determine whether the effective thickness detection value of the combination of the current pumping pressure value and the discharge gap width value meets the target thickness range of the discharge coating. If not, step S246 can be executed to test the next combination according to the test order of each combination of pumping pressure value and discharge gap width value. If yes, step S247 can be executed to acquire the thickness detection value of each thickness detection unit at each detection time, and to test the next combination according to the test order of each combination of pumping pressure value and discharge gap width value, until all combinations of pumping pressure value and discharge gap width value have been tested. Of course, even if all combinations have not been tested, if a satisfactory combination is found, the test can be ended and the product can be used directly for formal coating production.

[0051] Please see Figure 6 As shown, since the discharge gap of the die head is usually the gap between the upper and lower dies, if the discharge gap width is not appropriate, it can easily lead to uneven lateral coating, typically manifested as one end being thicker than the other. To determine if this is the case, in the specific implementation of step S241 above, step S2411 can be executed first to obtain the current thickness detection value of each thickness detection unit at the current moment. Next, step S2412 can be executed to obtain the maximum lateral distance between thickness detection units based on the positional relationship between each thickness detection unit. Next, step S2413 can be executed to obtain the total number of thickness detection units. Next, step S2414 can be executed to obtain the ratio of the difference between the maximum and minimum values ​​among all current thickness detection values ​​to the total number of thickness detection units as the current average thickness detection difference value. Next, step S2415 can be executed to use the difference between the current average thickness detection difference value and the maximum lateral distance between thickness detection units as the filtering slope. Next, step S2416 can be executed to perform linear fitting on each current thickness detection value based on the positional relationship between each thickness detection unit to obtain the fitting slope. Next, step S2417 can be executed to determine whether the fitted slope is less than the screening slope. If so, step S2418 can be executed to determine whether the coating of the discharged material is horizontally uniform due to the combination of the current pumping pressure value and the discharge gap width value; otherwise, step S2419 can be executed to determine whether the coating of the discharged material is not horizontally uniform. Even if there are some detection errors in the thickness detection values ​​during this process, it will not affect the overall judgment.

[0052] To supplement the explanation of the implementation process of steps S241 to S2419 above, source code for some functional modules is provided, with comparative explanations in the comments. To avoid data leakage involving trade secrets, data that does not affect the implementation of the solution has been anonymized; the same applies below.

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[0059] The code first defines a series of functions to obtain the current thickness detection value, calculate the maximum lateral distance, calculate the average thickness difference, and calculate the fitting slope. The main function uses these functions to determine whether the coating is laterally uniform. Specifically, if the fitting slope is less than the difference in the average thickness detection value, the coating is considered laterally uniform.

[0060] Please see Figure 7 As shown, due to the influence of the production environment, the coating thickness of the die head is not a completely constant value. To quantify it, during the combined test of the current pumping pressure value and the discharge gap width value, step S2441 can be executed first to continuously obtain the average thickness detection value of each thickness detection unit at each detection time as the average detection thickness value. Next, step S2442 can be executed to obtain the interval between the detection time of each average detection thickness value and the previous detection time based on the acquisition time of each average detection thickness value. Finally, step S2443 can be executed to use the interval length corresponding to each average detection thickness value as the weight of each average detection thickness value, and calculate the weighted average of each average detection thickness value as the effective thickness detection value of the combination of the current pumping pressure value and the discharge gap width value. This is because the interval length of the detection time of each average detection thickness value may be inconsistent. If the interval length of the detection time of each average detection thickness value is strictly consistent, the average value can be directly taken.

[0061] To provide supplementary explanation of the implementation process of steps S2441 to S2443 above, source code of some functional modules is provided, with comparative explanations in the comments.

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[0063]

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[0065] This code simulates a 10-second test cycle to calculate the effective thickness detection value of the combination of the current pumping pressure value and the discharge gap width value. The code first initializes a series of variables, including the cumulative thickness of each sensor, the number of measurements, the timestamp of the last measurement, the weights used to calculate the weighted average, and the weighted sum. During the test cycle, the code continuously simulates acquiring thickness values ​​from the sensors, calculates the time interval between each measurement, and multiplies each thickness average by its corresponding time interval (as a weight), accumulating these values ​​into the weighted sum. Finally, by dividing the weighted sum by the total weight, the weighted average of the effective thickness detection values ​​for the entire test cycle is obtained.

[0066] In simple terms, this code continuously simulates reading data from multiple thickness detection units and calculates a weighted average as the effective thickness detection value for the current pumping pressure and discharge gap width. This weighted average takes into account the time weight of each measurement to ensure that the result reflects the thickness changes throughout the entire testing cycle.

[0067] Please see Figures 8 to 10 As shown, the uniformity of the discharge coating is different under each combination of pumping pressure value and discharge gap width value. In order to select the most uniform combination, step S251 can be executed first to calculate the longitudinal discharge uniformity of each combination of pumping pressure value and discharge gap width value based on the thickness detection value of each thickness detection unit at each detection time.

[0068] Specifically, for each combination of pumping pressure value and discharge gap width value during the test period, step S2511 can be executed first to obtain the duration of the test period. Next, step S2512 can be executed to take the average thickness detection value of each thickness detection unit at each detection time as the average detection thickness at each detection time. Then, step S2513 can be executed to obtain the range of the average detection thickness based on the average detection thickness at each detection time.

[0069] In calculating the range of the average thickness for routine detection, the following steps are performed: First, step S25131 sorts the average thickness at each detection time according to its numerical value to obtain a sequence of average thicknesses. Next, step S25132 calculates the average difference between each average thickness in the sequence and its adjacent average thicknesses as a filter difference value. Next, step S25133 groups multiple consecutive average thicknesses in the sequence whose differences from their adjacent average thicknesses are less than the filter difference value into the same set of average thicknesses. Finally, step S25134 defines the range of average thicknesses within the set containing the largest number of average thicknesses as the range of the average thickness for routine detection.

[0070] After calculating the range of the average thickness for routine testing, step S2514 is executed to obtain the cumulative duration of the interval between the testing time and the previous testing time for each average thickness within the range of the average thickness for routine testing, which is taken as the routine duration. Next, step S2515 is executed to use the ratio of the routine duration to the duration of the testing period as the longitudinal discharge uniformity of the combination of the pumping pressure value and the discharge gap width value. Next, step S2516 is executed to summarize the longitudinal discharge uniformity for each combination of pumping pressure value and discharge gap width value. Finally, step S252 is executed to take the combination of the pumping pressure value and the discharge gap width value with the highest longitudinal discharge uniformity as the target pumping pressure value and the target discharge gap width value.

[0071] To provide supplementary explanation of the implementation process of steps S251 to S252 above, source code of some functional modules is provided, with comparative explanations in the comments.

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[0078] This code first defines a structure `TestResult` to store test data, containing the test duration and a series of thickness detection values. Then, it calculates the average thickness detected at each detection moment using a series of functions, sorts these averages, and calculates the average difference between adjacent thickness averages. Based on this difference, the averages are grouped, and the group with the largest difference is identified as the range of the regular average thickness detected. Finally, the regular duration corresponding to the average within this range is calculated, and the longitudinal output uniformity is calculated accordingly.

[0079] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved.

[0080] It should also be noted that each block in the block diagram and / or flowchart, as well as combinations of blocks in the block diagram and / or flowchart, can be implemented using hardware that performs the corresponding function or action, such as circuits or ASICs (Application Specific Integrated Circuits), or using a combination of hardware and software, such as firmware.

[0081] Although the invention has been described herein in conjunction with various embodiments, those skilled in the art will understand and implement other variations of the disclosed embodiments by reviewing the accompanying drawings, disclosure, and appended claims in carrying out the claimed invention. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit can implement several functions listed in the claims. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce good results.

[0082] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An auxiliary control system for a coating machine die head, characterized in that, include, The feeding pressure regulating device is used to regulate the pumping pressure of the slurry pumped by the die head; The discharge gap adjustment device is used to control the discharge gap width of the die head; The coating thickness detection array includes multiple thickness detection units, which are set perpendicular to the coating discharge direction to detect the coating thickness at each detection moment and obtain the thickness detection value. The control unit is used to pump slurry to the die head at different pumping pressure values ​​by the feeding pressure regulating device during the trial production stage, and to adjust the discharge gap width value by the discharge gap regulating device, and to synchronously record the thickness detection value of each thickness detection unit at each detection time during the trial production stage. Obtain the target thickness range for the output coating; The test sequence for obtaining each combination of pumping pressure value and discharge gap width value; Obtain the detection delay between die head ejection and coating thickness detection array thickness detection; Obtain the current thickness detection value of each thickness detection unit at the current moment; The maximum lateral distance between the thickness detection units is obtained based on the positional relationship between each thickness detection unit. Obtain the total number of all thickness detection units; The ratio of the difference between the maximum and minimum values ​​among all current thickness detection values ​​to the total number of thickness detection units is taken as the average difference of current thickness detection. The difference between the current average thickness detection difference and the maximum lateral distance between the thickness detection units is used as the screening slope; The fitting slope is obtained by linearly fitting each current thickness detection value based on the positional relationship between each thickness detection unit. Determine whether the fitted slope is less than the screening slope; If so, then determine that the combination of the current pumping pressure value and the discharge gap width value results in a uniform lateral coating of the discharged material. If not, then the opposite is true; If not, then proceed to the next combination of tests according to the test sequence of each combination of pumping pressure value and discharge gap width value; If so, the thickness detection value of each thickness detection unit at each detection time will be continuously acquired; The effective thickness detection value is obtained by continuously acquiring the thickness detection value of each thickness detection unit at each detection moment, which is a combination of the current pumping pressure value and the discharge gap width value. Determine whether the effective thickness detection value of the combination of the current pumping pressure value and the discharge gap width value conforms to the target thickness range of the discharge coating. If not, then proceed to the next combination of tests according to the test sequence of each combination of pumping pressure value and discharge gap width value; If so, the thickness detection value of each thickness detection unit at each detection time is obtained, and the next combination is tested according to the test order of each combination of pumping pressure value and discharge gap width value, until the test of all combinations of pumping pressure value and discharge gap width value is completed. The target pumping pressure value and target discharge gap width value are obtained by measuring the thickness detection value of each thickness detection unit at each detection time based on the combination of each pumping pressure value and discharge gap width value. The feed pressure and discharge gap are adjusted to the target pumping pressure and target discharge gap width values ​​respectively by the feed pressure regulating device and the discharge gap regulating device.

2. The system according to claim 1, characterized in that, The step of obtaining the detection delay between the die head ejection and the coating thickness detection array includes, The line distance between the die head's discharge gap and the coating thickness detection array is used as the discharge detection line distance; Continuously acquire the discharge line speed at each detection moment; The detection delay between each detection moment of the coating thickness detection array and the corresponding detection moment of the discharge gap is obtained based on the discharge detection line distance and the discharge line speed at each detection moment.

3. The system according to claim 1, characterized in that, The step of obtaining an effective thickness detection value by continuously acquiring the thickness detection value of each thickness detection unit at each detection moment, based on the combination of the current pumping pressure value and the discharge gap width value, includes: During the test of the current combination of pumping pressure and discharge gap width values The average thickness detection value of each thickness detection unit at each detection time is continuously obtained as the average detected thickness. The interval between the detection time of each average detection thickness and the previous detection time is obtained based on the acquisition time of each average detection thickness. The interval duration corresponding to each average thickness is used as the weight of each average thickness, and the weighted average of each average thickness is calculated as the effective thickness detection value of the combination of the current pumping pressure value and the discharge gap width value.

4. The system according to claim 1, characterized in that, The step of obtaining the target pumping pressure value and the target discharge gap width value by taking the thickness detection value of each thickness detection unit at each detection time based on the combination of each pumping pressure value and the discharge gap width value. include, The longitudinal discharge uniformity is calculated based on the thickness detection value of each thickness detection unit at each detection moment, corresponding to the combination of each pumping pressure value and discharge gap width value. The combination of the pumping pressure value and the discharge gap width value that achieves the highest longitudinal discharge uniformity is taken as the target pumping pressure value and the target discharge gap width value.

5. The system according to claim 4, characterized in that, The step of calculating the longitudinal discharge uniformity of each combination of pumping pressure value and discharge gap width value by each thickness detection unit at each detection time based on the thickness detection value of each thickness detection unit corresponding to each combination of pumping pressure value and discharge gap width value at each detection time. include, During the test for each combination of pumping pressure value and discharge gap width value Get the duration of the test period. The average thickness detection value of each thickness detection unit at each detection time is taken as the average thickness detected at each detection time. The range of the average thickness for routine testing can be obtained by taking the average thickness at each testing time. The cumulative duration of the interval between the detection time of each average detection thickness within the range of the average detection thickness is obtained as the normal duration. The ratio of the normal duration to the duration of the test period is used as the longitudinal discharge uniformity of the combination of the pumping pressure value and the discharge gap width value. The longitudinal discharge uniformity is obtained by summing up the combination of each pumping pressure value and discharge gap width value.

6. The system according to claim 5, characterized in that, The step of obtaining the range of the average detection thickness based on the average detection thickness at each detection time. include, The average detection thickness at each detection time is sorted according to its numerical value to obtain the average detection thickness sequence; The mean difference between each mean detection thickness and its adjacent mean detection thickness in the mean detection thickness sequence is calculated and used as the screening mean difference value; Multiple mean thicknesses in the mean thickness detection sequence whose difference from their adjacent mean thicknesses is less than the screening mean difference and which are connected are grouped into the same mean thickness detection set. The range of values ​​for the average thickness within the set of average thicknesses that contains the largest number of average thicknesses is taken as the range of the average thickness for regular detection.

7. A coating machine, comprising, A roll release unit is used to release the roll of material to be coated. The die head is used to transfer the slurry onto the surface of the roll material; The feeding unit is used to pump slurry into the die head; The winding unit is used to wind up the coated and dried roll material; Its features are, The feeding pressure regulating device is used to regulate the pumping pressure of the slurry pumped by the die head; The discharge gap adjustment device is used to control the discharge gap width of the die head; The coating thickness detection array includes multiple thickness detection units, which are set perpendicular to the coating discharge direction to detect the coating thickness at each detection moment and obtain the thickness detection value. The control unit is used to pump slurry to the die head at different pumping pressure values ​​by the feeding pressure regulating device during the trial production stage, and to adjust the discharge gap width value by the discharge gap regulating device, and to synchronously record the thickness detection value of each thickness detection unit at each detection time during the trial production stage. Obtain the target thickness range for the output coating; The test sequence for obtaining each combination of pumping pressure value and discharge gap width value; Obtain the detection delay between die head ejection and coating thickness detection array thickness detection; Obtain the current thickness detection value of each thickness detection unit at the current moment; The maximum lateral distance between the thickness detection units is obtained based on the positional relationship between each thickness detection unit. Obtain the total number of all thickness detection units; The ratio of the difference between the maximum and minimum values ​​among all current thickness detection values ​​to the total number of thickness detection units is taken as the average difference of current thickness detection. The difference between the current average thickness detection difference and the maximum lateral distance between the thickness detection units is used as the screening slope; The fitting slope is obtained by linearly fitting each current thickness detection value based on the positional relationship between each thickness detection unit. Determine whether the fitted slope is less than the screening slope; If so, then determine that the combination of the current pumping pressure value and the discharge gap width value results in a uniform lateral coating of the discharged material. If not, then the opposite is true; If not, then proceed to the next combination of tests according to the test sequence of each combination of pumping pressure value and discharge gap width value; If so, the thickness detection value of each thickness detection unit at each detection time will be continuously acquired; The effective thickness detection value is obtained by continuously acquiring the thickness detection value of each thickness detection unit at each detection moment, which is a combination of the current pumping pressure value and the discharge gap width value. Determine whether the effective thickness detection value of the combination of the current pumping pressure value and the discharge gap width value conforms to the target thickness range of the discharge coating. If not, then proceed to the next combination of tests according to the test sequence of each combination of pumping pressure value and discharge gap width value; If so, the thickness detection value of each thickness detection unit at each detection time is obtained, and the next combination is tested according to the test order of each combination of pumping pressure value and discharge gap width value, until the test of all combinations of pumping pressure value and discharge gap width value is completed. The target pumping pressure value and target discharge gap width value are obtained by measuring the thickness detection value of each thickness detection unit at each detection time based on the combination of each pumping pressure value and discharge gap width value. The feed pressure and discharge gap are adjusted to the target pumping pressure and target discharge gap width values ​​respectively by the feed pressure regulating device and the discharge gap regulating device.

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