An oven drying process parameter closed loop control method

Abstract

The application discloses a kind of oven drying process parameter closed-loop control method, including air velocity closed-loop regulation and NMP closed-loop regulation, the NMP closed-loop regulation includes exhaust ratio closed-loop regulation and exhaust amount closed-loop regulation, the air velocity closed-loop regulation, exhaust ratio closed-loop regulation, exhaust amount closed-loop regulation three kinds of sub-regulation system, wherein, exhaust ratio closed-loop regulation and exhaust amount closed-loop regulation jointly act to realize NMP closed-loop regulation.The closed-loop control method of the application can efficiently complete equipment commissioning without shutdown, with fast response speed, good adjustment accuracy, high degree of intelligence, greatly reducing the dependence on manual commissioning experience during commissioning process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of manufacturing, in particular to a drying process parameter closed-loop control method of an oven. BACKGROUND

[0002] Most of the oven equipment currently adopts the method of manual debugging for adjustment, which needs to be adjusted by the on-site operator after shutdown or in real time during the production process. The adjustment of the related parameters after shutdown needs to be verified by re-production, and once the abnormality occurs again, the machine needs to be stopped again for debugging. In the long run, not only the production cycle is seriously affected, but also a large amount of raw materials is wasted. In the real-time debugging process, there are human operation factors interference, slow response time to abnormal parameters, slow processing speed, and the debugging effect is extremely dependent on the experience of the on-site debugging personnel, which is difficult to guarantee the product quality after debugging. Once the abnormal problem cannot be effectively handled, it is easy to cause product batch scrap accidents. In addition, the oven equipment that has adopted the closed-loop adjustment method has a single control mode. One control system can only respond to the adjustment of one variable, and there is lack of interlocking between systems, which is easy to cause control conflict. Therefore, the number of variables that can be adjusted by the whole machine system is limited, and it is difficult to achieve whole machine closed-loop control.

[0003] Therefore, it is necessary to provide a drying process parameter closed-loop control method of an oven to solve the above problems. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the present application provides a drying process parameter closed-loop control method of an oven, which can efficiently complete the equipment debugging work without shutdown, has fast response speed, good adjustment precision, high intelligence, and greatly reduces the dependence on manual debugging experience in the debugging process.

[0005] The technical solution adopted by the present application to solve its technical problems is:

[0006] A drying process parameter closed-loop control method of an oven, comprising wind speed closed-loop adjustment and NMP closed-loop adjustment, wherein the NMP closed-loop adjustment comprises exhaust ratio closed-loop adjustment and exhaust amount closed-loop adjustment.

[0007] The wind speed closed-loop adjustment monitors and judges whether the wind speed of the upper and lower hulls meets the set requirements, adjusts the working frequency of the fan by adjusting the air frequency and the air brake, and adjusts the working frequency of the fan until the wind speed of the upper and lower hulls meets the set wind speed.

[0008] The NMP closed-loop adjustment monitors and judges whether the set conditions are met by the NMP concentration sensor, and adjusts the exhaust ratio and the exhaust amount in a closed loop. After the adjustment is completed, the concentration of the oven is monitored and judged again until the monitored concentration meets the set value, and the closed-loop adjustment is completed.

[0009] The exhaust ratio closed-loop regulation monitors the current exhaust ratio and determines whether the set requirement is met, calculates the exhaust fan execution frequency, and adjusts the fresh air volume based on the negative pressure value required by the oven, thereby affecting the exhaust ratio, until the exhaust ratio adjustment requirement is met.

[0010] The exhaust volume closed-loop regulation monitors the current exhaust volume and determines whether the set requirement is met, calculates the execution frequency, and adjusts the exhaust volume by adjusting the exhaust fan frequency until the exhaust volume adjustment requirement is met.

[0011] As a further improvement of the above technical solution, in the wind speed closed-loop regulation, when the upper hull wind speed and the lower hull wind speed do not meet the set value, the following steps are included:

[0012] S01, monitor the real-time wind speed of the upper and lower hulls, and judge the deviation from the set wind speed;

[0013] S02, if the upper hull wind speed is greater than the lower hull wind speed, in the upper air path regulation control, the current state is that the upper air brake is fully open, after recalculating the fan frequency, first adjust the opening degree of the upper air brake, if the difference between the real-time wind speed of the upper hull and the set wind speed still does not meet the set requirement at the minimum opening degree, then calculate the frequency again and execute, then repeat the above steps and control the opening degree of the lower air brake to assist, until the wind speed of the upper and lower hulls meets the set requirement;

[0014] S03, if the lower hull wind speed is greater than the upper hull wind speed, in the lower air path regulation control, the current state is that the lower air brake is fully open, after recalculating the fan frequency, first adjust the opening degree of the lower air brake, if the difference between the real-time wind speed of the lower hull and the set wind speed still does not meet the set requirement at the minimum opening degree, then calculate the frequency again and execute, then repeat the above steps and control the opening degree of the upper air brake to assist, until the wind speed of the upper and lower hulls meets the set requirement;

[0015] S04, re-judge the deviation of the wind speed of the upper and lower hulls from the set wind speed, if the requirement is met, the adjustment is complete; if the requirement is not met, repeat the steps of S01 to S03 until the wind speed of the upper and lower hulls meets the set requirement.

[0016] As a further improvement of the above technical solution, in the S02 step, the lower air path regulation air brake assists, the specific steps include: adjusting the opening degree of the lower air brake, judging whether the real-time wind speed of the upper hull meets the set wind speed deviation, if the set requirement is met, the adjustment is complete; if the set requirement is not met, readjust the opening degree of the lower air brake until the set condition is met and the adjustment is complete.

[0017] As a further improvement of the above technical solution, in the S03 step, the opening degree of the upper air passage regulating damper is adjusted, and whether the real-time wind speed of the lower ship body meets the set wind speed deviation is judged.

[0018] As a further improvement of the above technical solution, the exhaust air ratio closed loop regulation specifically comprises the following steps:

[0019] S11, whether the set exhaust air ratio requirement is met is judged by monitoring the current exhaust air ratio, if the set value is met, the adjustment is completed; if the set value is not met, the set frequency is executed and whether the real-time negative pressure value meets the set negative pressure value large range value is judged;

[0020] S12, if the real-time negative pressure value does not meet the set requirement, the real-time negative pressure value is judged, if the real-time negative pressure value is greater than the set negative pressure value upper limit, the fresh air damper opening degree and the set fresh air damper opening degree lower limit are judged, if the fresh air damper opening degree is less than the set fresh air damper opening degree lower limit, the total fresh air frequency is reduced, if the fresh air damper opening degree is greater than the set fresh air damper opening degree lower limit, the fresh air damper opening degree is reduced; if the real-time negative pressure value is not greater than the set negative pressure value upper limit, the fresh air damper opening degree and the set fresh air damper opening degree upper limit are judged, if the fresh air damper opening degree is less than the set fresh air damper opening degree upper limit, the fresh air damper opening degree is increased, if the fresh air damper opening degree is greater than the set fresh air damper opening degree upper limit, the total fresh air frequency is increased, whether the real-time negative pressure value is in the set range is judged again, if the requirement is met, the next step is performed, if the requirement is not met, the above steps are repeated until the set requirement is met;

[0021] S13, if the real-time negative pressure value meets the set requirement, whether the fan air frequency exceeds the upper and lower limit values of the set fan air frequency is judged, if the fan air frequency does not exceed the upper and lower limit values of the set fan air frequency, whether the real-time exhaust air speed meets the calculated air speed large range value is judged, if the requirement is not met, the S12 step is repeated until the real-time exhaust air speed meets the calculated air speed large range value, if the requirement is met, whether the real-time exhaust air speed meets the calculated air speed value is judged again, if the requirement is met, the fan frequency is finely adjusted or the fan frequency is finely increased until the current exhaust air ratio meets the set exhaust air ratio requirement, if the requirement is not met, the fan frequency is coarsely adjusted or the fan frequency is coarsely increased until the current exhaust air ratio meets the set exhaust air ratio requirement; if the fan air frequency exceeds the upper and lower limit values of the set fan air frequency, whether the real-time fan air frequency is less than the lower limit value of the set fan air frequency is judged, if the set requirement is met, the exhaust fan is closed, the damper is reduced, the damper closing state is judged again, if the requirement is met, the adjustment is completed, if the requirement is not met, whether the current exhaust air ratio meets the set exhaust air ratio requirement is judged, if the requirement is met, the adjustment is completed, if the fan air frequency exceeds the upper and lower limit values of the set fan air frequency, if the real-time fan air frequency is not less than the lower limit value of the set fan air frequency, the exhaust fan is adjusted to the maximum frequency, and the adjustment is completed.

[0022] As a further improvement of the above technical solution, the maximum power of the exhaust fan is 50 HZ.

[0023] As a further improvement of the above technical solution, the exhaust amount closed loop regulation specifically comprises the following steps:

[0024] S21, judge whether the current exhaust amount meets the set exhaust amount proportion deviation requirement;

[0025] S22, if the set requirement is met, the adjustment is completed, otherwise, the theoretical optimal wind frequency is executed based on the current actual working condition;

[0026] S23, judge whether the current exhaust amount meets the set exhaust amount actual deviation, if the requirement is not met, recalculate the wind frequency and repeat step S22 until the requirement is met and then proceed to the next step;

[0027] S24, judge whether the current exhaust amount meets the actual exhaust amount, if the requirement is met, the wind frequency is reduced, otherwise, the wind frequency is increased, and then proceed to the next step;

[0028] S25, judge whether the current exhaust amount meets the set exhaust amount proportion deviation requirement, if the requirement is met, the adjustment is completed, otherwise, repeat steps S23-S24 until the exhaust amount adjustment requirement is met.

[0029] As a further improvement of the above technical solution, the NMP closed loop regulation specifically comprises the following steps:

[0030] S31, monitor and judge whether the real-time concentration meets the set value deviation requirement through the NMP concentration sensor, if the requirement is met, proceed to the next step, otherwise, repeat the exhaust ratio and exhaust amount closed loop adjustment until the requirement is met;

[0031] S32, judge whether the real-time concentration meets the set concentration size value, if the real-time concentration is not greater than the set concentration, reduce the exhaust ratio and then proceed to the next step, if the real-time concentration is not less than the set concentration, increase the exhaust ratio and then proceed to the next step;

[0032] S33, judge whether the detected concentration meets the set concentration value deviation, if the concentration requirement is not met, repeat steps S31-S32 until the requirement is met, if the requirement is met, the closed loop regulation is completed.

[0033] The beneficial effects of the present application are:

[0034] 1. The closed-loop control system replaces manual adjustment of the equipment, compared with the traditional adjustment mode, the closed-loop control method of the application can efficiently complete the equipment debugging work in the production process without shutdown, has fast response speed, good adjustment precision, high intelligence degree, and greatly reduces the dependence on manual debugging experience in the debugging process.

[0035] 2. It has universality, the control scheme is based on the conventional oven structure to establish the oven drying process parameter closed-loop control method, and can be applied to the conventional type or special-shaped type oven that meets the configuration requirements on the market.

[0036] 3. The control precision is high, the control mode of coarse adjustment and then fine adjustment is adopted in the subsystem, on the one hand, it avoids low control precision and poor equipment performance caused by only coarse adjustment, and on the other hand, it avoids many adjustment cycles, slow equipment response and influence on product quality caused by only fine adjustment.

[0037] 4. The air speed closed-loop control, exhaust air volume closed-loop control, exhaust air ratio closed-loop control, oven negative pressure closed-loop control and NMP concentration closed-loop control are integrated and interlocked, and feedback is established between the sub-control systems and the main control system to build a closed-loop feedback control system for the whole machine drying adjustment. BRIEF DESCRIPTION OF DRAWINGS

[0038] The application will be further described below in combination with the drawings and examples.

[0039] Figure 1 It is a total flow diagram of the closed-loop control method of the application.

[0040] Figure 2 It is a flow diagram of the air speed closed-loop adjustment of the application.

[0041] Figure 3 It is a flow diagram of the NMP closed-loop adjustment of the application.

[0042] Figure 4 It is a flow diagram of the exhaust air ratio closed-loop adjustment of the application.

[0043] Figure 5 It is a flow diagram of the exhaust air volume closed-loop adjustment of the application. DETAILED DESCRIPTION

[0044] The concept, specific structure and generated technical effects of the present application will be clearly and completely described below in combination with embodiments and drawings, so as to fully understand the purposes, features and effects of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments, and other embodiments obtained by those skilled in the art on the basis of the embodiments of the present application without creative labor are within the protection scope of the present application. In addition, all the coupling / connection relations involved in the patent do not mean that the components are directly connected, but that a better coupling structure can be composed by adding or reducing coupling accessories according to the specific implementation situation, such as fixed connection / fixed installation which can be selected according to the needs, such as screw connection, bolt connection, pin connection, key connection, bonding, mortise and tenon connection, welding, riveting and the like, such as detachable connection which can be selected according to the needs, such as screw connection, bolt connection, threaded connection, buckle connection, mortise and tenon connection, magic tape connection and the like. The technical features in the present application can be combined interactively without conflict.

[0045] Referring to Figure 1 An oven drying process parameter closed-loop control method, including air speed closed-loop regulation and NMP closed-loop regulation, the NMP closed-loop regulation including exhaust ratio closed-loop regulation and exhaust amount closed-loop regulation, which can adjust the concentration or humidity, and the determination is made according to the positive and negative electrodes of the electrode, and the exhaust ratio closed-loop regulation and the exhaust amount closed-loop regulation jointly act to realize the closed-loop regulation of the NMP concentration (humidity), while the air speed closed-loop control, the exhaust amount closed-loop control, the exhaust ratio closed-loop control, the oven negative pressure closed-loop control and the NMP concentration closed-loop control are integrated and interlocked, and the feedback is established between the sub-control systems and the main control system, thereby constructing a closed-loop feedback control system of the whole machine drying regulation, which can efficiently complete the equipment debugging work without stopping in production, has fast response speed, good adjustment precision, high intelligent degree and greatly reduces the dependence on manual debugging experience in the debugging process.

[0046] The air speed closed-loop regulation monitors and judges whether the air speed of the upper and lower hulls meets the set requirements, first coarsely adjusts by adjusting the air frequency, and then finely adjusts by adjusting the air brake, until the air speed of the upper and lower hulls meets the size of the set air speed.

[0047] Among them, the control mode of taking air frequency adjustment as the main and air brake adjustment as the auxiliary effectively enhances the control ability, so as to ensure the efficiency of the upper hull and improve the efficiency of the pole piece coating.

[0048] Referring to Figure 2 Specifically, when the air speed of the upper and lower hulls does not meet the set value in the air speed closed-loop regulation, the following steps are specifically included:

[0049] S01, monitoring the real-time air speed of the upper and lower hulls, and judging the deviation from the set air speed;

[0050] S02, if the upper hull wind speed is greater than the lower hull wind speed, in the upwind path adjustment control, the current state is the upper wind gate fully open, after recalculating the fan wind frequency, first adjust the opening of the upper wind gate, if the difference between the real-time wind speed of the upper hull and the set wind speed still does not meet the interval when the minimum opening is set, then the wind frequency is calculated again and executed, and then the above steps are repeated and the opening of the lower wind gate is adjusted, until the wind speed of the upper hull meets the set requirement;

[0051] S03, if the lower hull wind speed is greater than the upper hull wind speed, in the downwind path adjustment control, the current state is the lower wind gate fully open, after recalculating the fan wind frequency, first adjust the opening of the lower wind gate, if the difference between the real-time wind speed of the lower hull and the set wind speed still does not meet the interval when the minimum opening is set, then the wind frequency is calculated again and executed, and then the above steps are repeated and the opening of the upper wind gate is adjusted, until the wind speed of the lower hull meets the set requirement;

[0052] S04, the deviation between the wind speed of the upper hull and the set wind speed is re-judged, and if the requirement is met, the adjustment is completed; if the requirement is not met, the steps of S01 to S03 are repeatedly executed until the wind speed of the upper hull and the lower hull meets the set requirement.

[0053] Specifically, in the S02 step, the wind frequency control adjustment is performed based on the upwind path, and the specific steps include: judging the deviation between the real-time wind speed of the upper hull and the set wind speed, if the set requirement is met, the adjustment is completed; if the set requirement is not met, adjusting the opening of the upper wind gate, and continuing to judge the deviation between the real-time wind speed of the upper hull and the set wind speed, until the set condition is met, then the adjustment is completed.

[0054] In the S02 step, the opening of the lower wind gate is adjusted, the deviation between the real-time wind speed of the upper hull and the set wind speed is judged, if the set requirement is met, the adjustment is completed; if the set requirement is not met, the opening of the lower wind gate is re-adjusted until the set condition is met, then the adjustment is completed.

[0055] In the S03 step, the wind frequency control adjustment is performed based on the downwind path, and the specific steps include: judging the deviation between the real-time wind speed of the lower hull and the set wind speed, if the set requirement is met, the adjustment is completed; if the set requirement is not met, adjusting the opening of the upper wind gate, and continuing to judge the deviation between the real-time wind speed of the lower hull and the set wind speed and recalculating the fan wind frequency, until the set condition is met, then the adjustment is completed.

[0056] In the S03 step, the opening of the upper wind gate is adjusted, the deviation between the real-time wind speed of the lower hull and the set wind speed is judged, if the set requirement is met, the adjustment is completed; if the set requirement is not met, the opening of the upper wind gate is re-adjusted until the set condition is met, then the adjustment is completed.

[0057] The upper hull and the lower hull in the prior art are synchronously adjusted instead of being repeatedly adjusted, the damper control and the damper and air frequency linkage control are utilized, and a new control mode and control logic are adopted, so that the control mode is more stereoscopic, the adjustment process is simplified, and the adjustment accuracy is improved.

[0058] The NMP closed-loop adjustment is monitored by the NMP concentration sensor to determine whether the set condition is met, and the exhaust ratio and the exhaust volume are closed-loop adjusted, the oven concentration is monitored again after the adjustment is completed, until the monitored concentration meets the set value, and the closed-loop adjustment is completed.

[0059] The negative pressure adjustment is included in the exhaust ratio adjustment, the NMP concentration or humidity is adjusted by the exhaust ratio and the exhaust volume, the adjustment interlocking mode is changed, the interlocking system is increased, the control accuracy is improved, and the key parameters of the systems are interlocked to avoid control conflicts caused by independent adjustment of the subsystems.

[0060] Referring to Figure 3 , specifically, the NMP closed-loop adjustment specifically includes the following steps:

[0061] S31, the real-time concentration is monitored by the NMP concentration sensor to determine whether the set value deviation requirement is met, that is, the concentration of the current oven is within the expected tolerance, and the requirement is met, and then the next step is performed; if the requirement is not met, the exhaust ratio and the exhaust volume are repeatedly closed-loop adjusted until the requirement is met;

[0062] S32, it is determined whether the real-time concentration meets the set concentration size value, if the real-time concentration is not greater than the set concentration, the exhaust ratio is reduced, and the next step is performed, if the real-time concentration is not less than the set concentration, the previous step does not need to be repeatedly cycled, only the exhaust ratio needs to be finely adjusted, the exhaust ratio is directly increased, and the next step is performed, and the adjustment efficiency is effectively improved;

[0063] S33, it is determined whether the detected concentration meets the set concentration value deviation; if the concentration requirement is not met, steps S31-S32 are repeatedly performed until the requirement is met, and if the requirement is met, the closed-loop adjustment is completed.

[0064] In addition, as a foolproof process, a cycle determination is also performed to ensure that the "blind adjustment" in the current step does not destroy the overall balance, otherwise the adjustment step S31 needs to be returned to and the closed-loop adjustment is recompleted.

[0065] The exhaust ratio closed-loop adjustment monitors the current exhaust ratio and determines whether the set requirement is met, the air frequency of the exhaust fan is calculated, and the exhaust ratio is adjusted by adjusting the oven negative pressure value until the exhaust ratio adjustment requirement is met.

[0066] Wherein, the double regulation is added, when the set requirement is not met, the wind frequency is adjusted in the way of rough adjustment and then fine adjustment; when the set requirement is met, the one-way wind frequency adjustment is changed to the wind frequency and the linkage adjustment of the damper; the control logic of one-way control is changed, the feedback adjustment is added, the control precision is improved, the adjustment difficulty is reduced, and the linkage adjustment gives the system greater tolerance.

[0067] Referring to Figure 4 , specifically, the exhaust ratio closed loop regulation specifically includes the following steps:

[0068] S11, whether the set exhaust ratio requirement is met is judged by monitoring the current exhaust ratio, if the set value is met, the adjustment is completed; if the set value is not met, the set frequency is executed and whether the real-time negative pressure value meets the set negative pressure value is judged;

[0069] S12, if the real-time negative pressure value does not meet the set requirement, the real-time negative pressure value is judged, if the real-time negative pressure value is greater than the set negative pressure value upper limit, the fresh air damper opening and the set fresh air damper opening lower limit are judged, if the fresh air damper opening is less than the set fresh air damper opening lower limit, the total fresh air frequency is reduced, if the fresh air damper opening is greater than the set fresh air damper opening lower limit, the fresh air damper opening is reduced; if the real-time negative pressure value is not greater than the set negative pressure value upper limit, the fresh air damper opening and the set fresh air damper opening upper limit are judged, if the fresh air damper opening is less than the set fresh air damper opening upper limit, the fresh air damper opening is increased, if the fresh air damper opening is greater than the set fresh air damper opening upper limit, the total fresh air frequency is increased, whether the real-time negative pressure value is in the set range is judged again, if the requirement is met, the next step is performed, if the requirement is not met, the above steps are repeated until the set requirement is met;

[0070] S13, if the real-time negative pressure value meets the set requirement, whether the fan frequency exceeds the upper and lower limit values of the set fan frequency is judged, if the fan frequency does not exceed the upper and lower limit values of the set fan frequency, whether the real-time exhaust air speed meets the calculated speed large range value is judged, if the requirement is not met, the S12 step is repeated until the real-time exhaust air speed meets the calculated speed large range value, if the requirement is met, whether the real-time exhaust air speed meets the calculated speed value is judged again, if the requirement is met, the fan frequency is fine adjusted or the fan frequency is fine adjusted until the current exhaust ratio meets the set exhaust ratio requirement, if the requirement is not met, the fan frequency is rough adjusted or the fan frequency is rough adjusted until the current exhaust ratio meets the set exhaust ratio requirement; if the fan frequency exceeds the upper and lower limit values of the set fan frequency, whether the real-time fan frequency is less than the lower limit value of the set fan frequency is judged, if the set requirement is met, the exhaust fan is closed, the damper is reduced, the damper closed state is judged again, the requirement is met, the adjustment is completed, the requirement is not met, whether the current exhaust ratio meets the set exhaust ratio requirement is judged, if the requirement is met, the adjustment is completed, if the fan frequency exceeds the upper and lower limit values of the set fan frequency, the real-time fan frequency is not less than the lower limit value of the set fan frequency, the exhaust fan is adjusted to the maximum frequency 50HZ, and the adjustment is completed.

[0071] The exhaust air volume closed loop regulation monitors the current exhaust air volume to determine whether the set requirement is met, calculates the air frequency, and adjusts the exhaust fan air frequency to control the exhaust air volume until the exhaust air volume adjustment requirement is met.

[0072] Referring to Figure 5 Specifically, the exhaust air volume closed loop regulation specifically includes the following steps:

[0073] S21, determining whether the current exhaust air volume meets the set exhaust air volume proportional deviation requirement;

[0074] S22, if the set requirement is met, the adjustment is completed; if the set requirement is not met, the theoretical optimal air frequency is executed based on the current actual working condition;

[0075] S23, determining whether the current exhaust air volume meets the set exhaust air volume actual deviation requirement, if the requirement is not met, the air frequency is recalculated and the step S22 is repeated until the requirement is met and the next step is performed;

[0076] S24, determining whether the current exhaust air volume meets the actual air volume size, if the requirement is met, the air frequency is reduced; if the requirement is not met, the air frequency is increased, and the next step is performed;

[0077] S25, determining whether the current exhaust air volume meets the set exhaust air volume proportional deviation requirement, if the requirement is met, the adjustment is completed; if the requirement is not met, the steps S23-S24 are repeated until the exhaust air volume adjustment requirement is met.

[0078] Wherein, a secondary determination is added, the air frequency is adjusted again through fine adjustment to improve the adjustment accuracy and reduce the influence of errors on the entire control system.

[0079] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the described embodiments, and those skilled in the art can make various equivalent modifications or replacements without deviating from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A closed-loop control method for oven drying process parameters, characterized in that: It includes wind speed closed-loop regulation and NMP closed-loop regulation. The NMP closed-loop regulation includes exhaust ratio closed-loop regulation and exhaust volume closed-loop regulation. The exhaust ratio closed-loop regulation and exhaust volume closed-loop regulation work together to achieve NMP closed-loop regulation. The wind speed closed-loop regulation monitors the current wind speed of the upper and lower hulls and determines whether it meets the set requirements. First, it makes a coarse adjustment by adjusting the wind frequency, and then it makes a fine adjustment by adjusting the wind gate until the wind speed of the upper and lower hulls meets the set wind speed. The NMP closed-loop regulation uses an NMP concentration sensor to monitor and determine whether the set conditions are met, and performs closed-loop adjustment on the exhaust ratio and exhaust volume. After the adjustment is completed, the oven concentration is monitored and determined again until the monitored concentration meets the set value, thus completing the closed-loop regulation. The closed-loop adjustment of the exhaust ratio monitors the current exhaust ratio and determines whether it meets the set requirements. It calculates the exhaust fan's operating frequency and adjusts the fresh air volume based on the negative pressure value required by the oven, thereby affecting the exhaust ratio until the exhaust ratio adjustment requirements are met. The closed-loop regulation of the exhaust volume monitors and determines whether the current exhaust volume meets the set requirements. It calculates the air frequency and controls the exhaust volume by adjusting the exhaust fan frequency until the exhaust volume adjustment requirements are met. In the closed-loop wind speed regulation, when the wind speeds of the upper and lower hulls do not meet the set values, the specific steps include: S01. Monitor the real-time wind speed of the upper and lower hulls and judge the deviation from the set wind speed. S02. If the wind speed on the upper hull is greater than that on the lower hull, in the upper wind path adjustment control, the current state is that the upper wind gate is fully open. After recalculating the wind frequency of the blower, the opening of the upper wind gate is first adjusted. If the difference between the real-time wind speed of the upper hull and the set wind speed is still not met when the minimum opening is set, the wind frequency is recalculated and executed. Then the above steps are repeated and the lower wind path adjustment wind gate opening is assisted until the wind speeds of the upper and lower hulls meet the set requirements. S03. If the wind speed of the lower hull is greater than that of the upper hull, in the downwind path adjustment control, the current state is that the downwind gate is fully open. After recalculating the wind frequency of the fan, the downwind gate opening is adjusted first. If the difference between the real-time wind speed of the lower hull and the set wind speed is still not met when the minimum opening is set, the wind frequency is recalculated and executed. Then the above steps are repeated and the upwind path adjustment gate opening is controlled to assist until the wind speeds of the upper and lower hulls meet the set requirements. S04. Reassess the deviation between the wind speed of the upper and lower hulls and the set wind speed. If the requirements are met, the adjustment is complete; if the requirements are not met, repeat steps S01 to S03 until the wind speed of the upper and lower hulls meets the set requirements. In step S02, the downwind road adjustment of the wind gate opening is assisted. The specific steps include: adjusting the downwind gate opening, judging whether the real-time wind speed of the upper hull meets the set wind speed deviation. If the set requirements are met, the adjustment is completed; if the set requirements are not met, the downwind gate opening is readjusted until the set conditions are met, and the adjustment is completed. In step S03, the upwind road adjustment windbreak opening is assisted. The specific steps include: adjusting the upwind windbreak opening, determining whether the real-time wind speed of the hull meets the set wind speed, and if it meets the set requirements, the adjustment is complete; if it does not meet the set requirements, the upwind windbreak opening is readjusted until the set conditions are met, and the adjustment is complete.

2. The closed-loop control method for oven drying process parameters according to claim 1, characterized in that: The closed-loop adjustment of the exhaust ratio specifically includes the following steps: S11. By monitoring the current exhaust ratio, determine whether it meets the set exhaust ratio requirement. If it meets the set value, the adjustment is complete; if it does not meet the set value, execute the set frequency and determine whether the real-time negative pressure value meets the large range of the set negative pressure value. S12. If the real-time negative pressure value does not meet the set requirements, the real-time negative pressure value is judged. If the real-time negative pressure value is greater than the set upper limit of the negative pressure value, the opening of the fresh air damper is judged against the set lower limit of the fresh air damper opening. If the opening of the fresh air damper is less than the set lower limit of the fresh air damper opening, the total fresh air frequency is reduced. If the opening of the fresh air damper is greater than the set lower limit of the fresh air damper opening, the opening of the fresh air damper is reduced. If the real-time negative pressure value is not greater than the set upper limit of the negative pressure value, the opening of the fresh air damper is judged against the set upper limit of the fresh air damper opening. If the opening of the fresh air damper is less than the set upper limit of the fresh air damper opening, the opening of the fresh air damper is increased. If the opening of the fresh air damper is greater than the set upper limit of the fresh air damper opening, the total fresh air frequency is increased. The real-time negative pressure value is judged again to see if it is within the set range. If it meets the requirements, proceed to the next step. If it does not meet the requirements, repeat the above steps until the set requirements are met. S13. If the real-time negative pressure value meets the set requirements, check whether the fan frequency exceeds the upper and lower limits of the set fan frequency. If the fan frequency does not exceed the upper and lower limits of the set fan frequency, check whether the real-time exhaust velocity meets the calculated maximum range value. If it does not meet the requirements, repeat step S12 until the real-time exhaust velocity meets the calculated maximum range value. If it does meet the requirements, check again whether the real-time exhaust velocity meets the calculated velocity value. If it does meet the requirements, fine-tune the frequency of the small fan or the large fan until the current exhaust ratio meets the set exhaust ratio requirement. If it does not meet the requirements, coarsely adjust the frequency of the small fan or the large fan. The frequency of the main fan is adjusted until the current exhaust ratio meets the set exhaust ratio requirement. If the fan frequency exceeds the upper or lower limit of the set fan frequency, it is determined whether the real-time fan frequency is less than the lower limit of the set fan frequency. If the set requirement is met, the exhaust fan is turned off and the damper is reduced. The damper closure status is then checked. If the requirement is met, the adjustment is complete. If the requirement is not met, it is determined whether the current exhaust ratio meets the set exhaust ratio requirement. If the requirement is met, the adjustment is complete. If the fan frequency exceeds the upper or lower limit of the set fan frequency, it is determined that the real-time fan frequency is not less than the lower limit of the set fan frequency. The exhaust fan is then adjusted to the maximum frequency to complete the adjustment.

3. The closed-loop control method for oven drying process parameters according to claim 2, characterized in that: The maximum power of the exhaust fan is 50Hz.

4. The closed-loop control method for oven drying process parameters according to claim 1, characterized in that: The closed-loop regulation of the exhaust volume specifically includes the following steps: S21. Determine whether the current exhaust volume meets the set exhaust volume ratio deviation requirement; S22. If the set requirements are met, the adjustment is complete; if the set requirements are not met, the theoretically optimal wind frequency will be executed based on the current actual operating conditions. S23. Determine whether the current exhaust volume meets the actual deviation of the set exhaust volume. If it does not meet the requirements, recalculate the wind frequency and repeat step S22 until the requirements are met, then proceed to the next step. S24. Determine whether the current exhaust volume meets the actual air volume requirement. If it does, reduce the fan frequency; if it does not, increase the fan frequency before proceeding to the next step. S25. Determine whether the current exhaust volume meets the set exhaust volume ratio deviation requirement. If it meets the requirement, the adjustment is complete; if it does not meet the requirement, repeat steps S23-S24 until the exhaust volume adjustment requirement is met.

5. The closed-loop control method for oven drying process parameters according to claim 1, characterized in that: The NMP closed-loop regulation specifically includes the following steps: S31. Monitor the real-time concentration using an NMP concentration sensor to determine if it meets the set value deviation requirement. If it does, proceed to the next step; otherwise, repeat the closed-loop adjustment of the exhaust ratio and exhaust volume until the requirement is met. S32. Determine whether the real-time concentration meets the set concentration value. If the real-time concentration is not greater than the set concentration, reduce the exhaust ratio and proceed to the next step. If the real-time concentration is not less than the set concentration, increase the exhaust ratio and proceed to the next step. S33. Determine whether the detected concentration meets the set concentration value deviation; if it does not meet the concentration requirement, repeat steps S31-S32 until the requirement is met; if the requirement is met, the closed-loop adjustment is completed.

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