Method for controlling roller negative pressure and cut tobacco moisture of thin-plate cut tobacco dryer

Abstract

The invention discloses a method for controlling roller negative pressure and tobacco shred moisture of a thin-plate cut-tobacco dryer, which comprises the following steps of: acquiring real-time water removal amount and target water removal amount of a moisture removal pipeline of the thin-plate cut-tobacco dryer, and setting a first PID (Proportion Integration Differentiation) control model which is used for performing PID control on a target negative pressure value of a roller of the cut-tobacco dryer according to the target water removal amount and the real-time water removal amount; a real-time negative pressure value in a cut tobacco dryer roller is obtained, and a second PID control model is set and used for conducting PID control on the target moisture removal air door opening degree value according to the real-time negative pressure value and the target negative pressure value; the first PID control model and the second PID control model form a cascade PID adjusting structure, and the real-time moisture removal amount of the cut-tobacco dryer is adjusted according to the target moisture removal air door opening value. The continuity of moisture and negative pressure adjustment of the cut tobacco dryer can be improved, and finally the accuracy of cut tobacco moisture content control is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tobacco shred drying equipment control, and more specifically, to a method for controlling the negative pressure of a roller and the moisture content of tobacco shreds of a thin-plate tobacco drying machine. Background Art

[0002] In the tobacco processing process, the drying of cut tobacco by roller is an important link in the tobacco production line. It has three main process tasks. The first is to make the moisture content of the exported cut tobacco reach the moisture content suitable for rolling required by the cigarette process through drying and dehydration. The second is to increase the filling value of the cut tobacco through loose curling, improve the online expansion effect, and reduce the rolling consumption under the premise of improving the internal quality. The third is that through the baking of the thin plate dryer, the green impurities and part of the free nicotine in the cut tobacco will escape with the evaporation of water, so that the aroma of the cut tobacco is revealed and the smoke becomes mellow.

[0003] The control principle of the thin-plate storage tobacco drying machine is to obtain the amount of moisture in the tobacco that the tobacco drying machine needs to remove, that is, the real-time water removal amount, by collecting the inlet tobacco moisture content, the inlet tobacco mass flow rate and the target outlet tobacco moisture content according to the formula parameters, and adopt the method of mainly adjusting the thin plate temperature, hot air temperature and speed to achieve the target real-time water removal amount; the hot air fan draws fresh air from the workshop, and enters the hot air duct after being heated to the set temperature by the heat exchanger. The hot air duct is divided into two routes, one enters the drum, and the other merges with the exhaust gas discharged from the drum and enters the dehumidification duct for discharge. By adjusting the air door opening of the two hot air ducts, the speed of the hot air entering the drum can be adjusted; the air door opening of the dehumidification duct aims to adjust the negative pressure in the drum to maintain a slight negative pressure in the drum to ensure that the tobacco material does not spread outward and to ensure that the temperature and humidity in the drum are isolated from the outside. The process quality of the thin-plate tobacco drying machine is easily affected by seasonal changes. Under the same formula parameters, the temperature and humidity of the workshop become higher in summer, resulting in the saturation of the hot air itself. The hot air speed must be increased to remove more moisture from the drum. Because the hot air fan has limited energy efficiency, once the hot air speed exceeds the upper limit, the moisture content of the exported tobacco will be too high, or the surface of the tobacco meets the set value of moisture, but the inside of the tobacco is too dry, and the overall moisture content of the tobacco is low after being stored in the subsequent process storage cabinet; when the temperature and humidity of the workshop become lower in winter, the humidity of the hot air itself is too low, and the hot air speed must be reduced to avoid taking away too much moisture from the drum. When it is lower than the lower limit of the wind speed, the moisture content of the tobacco surface will be too low. Therefore, it is of great significance to adjust the roller negative pressure and tobacco moisture content of the thin-plate tobacco drying machine in real time to adapt to seasonal changes. Summary of the invention

[0004] The present invention provides a method for controlling the negative pressure of the roller and the moisture content of tobacco in a thin-plate tobacco drying machine, which solves the problem that the moisture content control of tobacco in the thin-plate tobacco drying machine fluctuates greatly due to the influence of seasons, can improve the continuity of the moisture content and negative pressure regulation of the tobacco drying machine, and ultimately improve the accuracy of controlling the moisture content of tobacco.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A method for controlling the negative pressure of a roller and the moisture content of tobacco shreds of a thin-plate tobacco drying machine, comprising:

[0007] Obtaining the real-time water removal amount and the target water removal amount of the moisture removal pipe of the thin plate wire drying machine, setting a first PID control model for performing PID control on the target negative pressure value of the wire drying machine drum according to the target water removal amount and the real-time water removal amount;

[0008] Obtaining a real-time negative pressure value in the drum of the tofu drying machine, and setting a second PID control model for performing PID control on a target dehumidification air door opening value according to the real-time negative pressure value and the target negative pressure value;

[0009] The first PID control model and the second PID control model form a cascade PID adjustment structure, and adjust the real-time water removal amount of the tofu drying machine according to the target moisture removal air door opening value.

[0010] Preferably, the step of obtaining the real-time water removal amount of the moisture removal pipeline of the thin-plate wire drying machine comprises:

[0011] Obtain the volumetric moisture content, wind speed and diameter of the dehumidification pipe of the tofu drying machine, and calculate the real-time water flow of the dehumidification pipe;

[0012] Obtain the volumetric moisture content, wind speed and diameter of the hot air inlet duct of the tofu drying machine, and calculate the real-time water flow in the hot air duct;

[0013] The real-time water flow rate of the dehumidification pipe is subtracted from the real-time water flow rate of the hot air pipe to obtain the real-time water removal amount of the dehumidification pipe.

[0014] Preferably, the PID control of the target negative pressure value of the silk drying machine drum according to the target water removal amount and the real-time water removal amount includes:

[0015] A first difference e1 between the target water removal amount and the real-time water removal amount is used as an input of the first PID control model to obtain a target negative pressure value.

[0016] Preferably, the PID control of the dehumidification damper opening value according to the real-time negative pressure value and the target negative pressure value comprises:

[0017] The target negative pressure value is subtracted from the real-time negative pressure value to obtain a second difference e2, and the second difference e2 is used as an input of the second PID control model to obtain a target dehumidification damper opening value.

[0018] Preferably, it also includes:

[0019] When the first difference e1 is greater than a first threshold, the target negative pressure value is increased and adjusted by the first PID control model;

[0020] When the target negative pressure value is greater than the real-time negative pressure, the damper opening of the dehumidification duct is adjusted by the second PID control model to increase the dehumidification air volume, thereby increasing the dehumidification water removal amount.

[0021] Preferably, it also includes:

[0022] When the first difference e1 is less than a second threshold, the target negative pressure value is adjusted by the first PID control model, and the second threshold is less than the first threshold;

[0023] When the target negative pressure value is less than the real-time negative pressure, the damper opening of the dehumidification duct is adjusted by the second PID control model to reduce the dehumidification air volume, thereby reducing the dehumidification water removal amount, so as to reduce the difference between the target water removal amount and the real-time water removal amount.

[0024] Preferably, it also includes:

[0025] The volumetric moisture content of the dehumidification duct and the hot air inlet duct of the tofu drying machine, the duct wind speed and the real-time water removal amount of the dehumidification duct corresponding to each batch are obtained, and the corresponding average values ​​are used for regression analysis of the target water removal amount of the feedforward control process parameter to correct the target water removal amount.

[0026] Preferably, it also includes:

[0027] The real-time water removal amount of the dehumidification pipe and the average value of the target water removal amount in each batch are obtained, and the corresponding average values ​​are used for regression analysis of the first threshold and the second threshold to correct the first threshold and the second threshold.

[0028] Preferably, the calculation to obtain the real-time water flow of the tidal drainage pipe includes:

[0029] A moisture content detection instrument with industrial network communication function is arranged on the dehumidification pipe of the tofu drying machine to detect the moisture content of the air in the dehumidification pipe;

[0030] A wind speed detection instrument with industrial network communication function is arranged in the dehumidification duct of the tofu drying machine to detect the air flow rate in the dehumidification duct;

[0031] Obtaining the diameter of the dehumidification pipe, and calculating the gas flow rate in the dehumidification pipe according to the diameter of the dehumidification pipe and the air flow rate in the dehumidification pipe;

[0032] The real-time water flow in the dehumidification pipe is calculated by multiplying the gas flow in the dehumidification pipe by the moisture content of the air in the dehumidification pipe.

[0033] Preferably, the calculation to obtain the real-time water flow rate of the hot air duct includes:

[0034] A moisture content detection instrument with an industrial network communication function is arranged on the hot air inlet duct of the tofu drying machine to detect the moisture content of the air in the hot air inlet duct;

[0035] A wind speed detection instrument with an industrial network communication function is arranged in the hot air inlet duct of the tofu drying machine to detect the air flow rate in the hot air inlet duct;

[0036] Obtaining the diameter of the hot air duct, and calculating the gas flow in the hot air inlet duct according to the diameter of the hot air duct and the air flow rate in the hot air inlet duct;

[0037] The real-time water flow in the hot air inlet pipe is obtained by multiplying the gas flow in the hot air inlet pipe by the air humidity content in the hot air inlet pipe.

[0038] The present invention provides a method for controlling the negative pressure of a roller and the moisture content of tobacco in a thin-plate tobacco drying machine. By establishing a first PID control model and a second PID control model and forming a cascade PID adjustment structure, a two-stage serial negative feedback control is formed for the target water removal amount, real-time water removal amount, negative pressure of the roller and the opening of a moisture exhaust door of the tobacco drying machine. The problem that the moisture content control of tobacco in the thin-plate tobacco drying machine is easily affected by the season and has large fluctuations can be solved. The continuity of the moisture content and negative pressure regulation of the tobacco drying machine can be improved, and the accuracy of the moisture content control of tobacco is finally improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below.

[0040] Figure 1 It is a schematic diagram of a method for controlling the negative pressure of a roller and the moisture content of tobacco shreds of a thin-plate tobacco drying machine provided by the present invention.

[0041] Figure 2 It is a schematic diagram of a control structure for cascade regulation of moisture and negative pressure in a tofu drying machine provided by an embodiment of the present invention.

[0042] Figure 3 It is a schematic diagram of the structure of a tofu drying machine provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to enable persons skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0044] In view of the problem that the moisture content control of tobacco in the current thin-plate tobacco drying machine is easily affected by the seasons, resulting in large fluctuations in moisture content, the present invention provides a method for controlling the roller negative pressure and the moisture content of tobacco in the thin-plate tobacco drying machine, which solves the problem that the moisture content control of tobacco in the thin-plate tobacco drying machine is easily affected by the seasons, can improve the consistency of the moisture content and negative pressure regulation of the tobacco drying machine, and ultimately improve the accuracy of controlling the moisture content of tobacco.

[0045] like Figure 1 As shown, a method for controlling the negative pressure of a roller and the moisture content of tobacco shreds of a thin-plate tobacco drying machine comprises:

[0046] S1: obtaining the real-time water removal amount and the target water removal amount of the moisture removal pipe of the thin plate wire drying machine, and setting a first PID control model for performing PID control on the target negative pressure value of the wire drying machine drum according to the target water removal amount and the real-time water removal amount.

[0047] S2: Obtain the real-time negative pressure value in the tofu drying machine drum, and set a second PID control model for performing PID control on the target dehumidification air door opening value according to the real-time negative pressure value and the target negative pressure value.

[0048] S3: The first PID control model and the second PID control model form a cascade PID adjustment structure, and adjust the real-time water removal amount of the tofu drying machine according to the target moisture removal air door opening value.

[0049] Specifically, Figure 2 As shown in the figure, the first PID control model that adjusts the real-time water removal of the dehumidification pipeline according to the target water removal is used as the outer loop, and the second PID control model that adjusts the negative pressure control by the difference between the target water removal and the real-time water removal forms a cascade PID control, and finally stabilizes the outlet moisture value. This method uses negative pressure control as the auxiliary regulator of the inner loop of the cascade PID, and the target water removal is the main regulator of the outer loop of the cascade PID. The inner loop is stabilized first, and the outer loop is stabilized later. No matter where the external interference enters the silk drying machine control system, it has good controllability. Before the interference factor fails to make the main adjustment take effect, it is likely to be overcome by the auxiliary adjustment with "first adjustment", "fast adjustment" and "coarse adjustment". The remaining interference effects are then overcome by the main adjustment, slow adjustment and fine adjustment. Due to the introduction of a secondary loop, the influence of the interference entering the secondary loop on the main parameters can be overcome early, and the main parameters to be adjusted can be ensured to be adjusted in time under other interference effects. Therefore, the control accuracy of the outlet moisture can be greatly improved, the influence of the temperature and humidity of the silk drying machine on the seasonal changes can be overcome, and the outlet moisture can be stabilized.

[0050] Further, the method of obtaining the real-time water removal amount of the moisture removal pipeline of the thin-plate tofu drying machine includes:

[0051] The moisture content, wind speed and diameter of the dehumidification pipe of the tofu drying machine are obtained, and the real-time water flow of the dehumidification pipe is calculated.

[0052] The volumetric moisture content, wind speed and diameter of the hot air inlet duct of the tofu drying machine are obtained, and the real-time water flow rate of the hot air duct is calculated.

[0053] The real-time water flow rate of the dehumidification pipe is subtracted from the real-time water flow rate of the hot air pipe to obtain the real-time water removal amount of the dehumidification pipe.

[0054] Preferably, the PID control of the target negative pressure value of the silk drying machine drum according to the target water removal amount and the real-time water removal amount includes:

[0055] A first difference e1 between the target water removal amount and the real-time water removal amount is used as an input of the first PID control model to obtain a target negative pressure value.

[0056] Further, the PID control of the opening value of the dehumidification damper according to the real-time negative pressure value and the target negative pressure value includes:

[0057] The target negative pressure value is subtracted from the real-time negative pressure value to obtain a second difference e2, and the second difference e2 is used as an input of the second PID control model to obtain a target dehumidification damper opening value.

[0058] The method also includes: when the first difference e1 is greater than a first threshold value, the target negative pressure value is increased by the first PID control model; and when the target negative pressure value is greater than the real-time negative pressure, the damper opening of the dehumidification duct is adjusted by the second PID control model to increase the dehumidification air volume, thereby increasing the dehumidification water removal amount.

[0059] The method also includes: when the first difference e1 is less than a second threshold value, the target negative pressure value is subtracted and adjusted through the first PID control model, and the second threshold value is less than the first threshold value; and when the target negative pressure value is less than the real-time negative pressure, the damper opening of the dehumidification duct is adjusted through the second PID control model to reduce the dehumidification air volume, thereby reducing the dehumidification water removal amount, so as to reduce the difference between the target water removal amount and the real-time water removal amount.

[0060] The method also includes: obtaining the volume moisture content of the dehumidification duct and the hot air inlet duct of the tofu drying machine, the duct wind speed and the real-time water removal amount of the dehumidification duct corresponding to each batch, and using the corresponding average value for the target water removal amount of the feedforward control process parameter for regression analysis to correct the target water removal amount.

[0061] The method also includes: obtaining the real-time water removal volume of the dehumidification pipe and the average value corresponding to the target water removal volume in each batch, and using the corresponding average value for regression analysis of the first threshold and the second threshold to correct the first threshold and the second threshold.

[0062] In practical applications, the first threshold is greater than the second threshold, the first threshold is greater than or equal to 0, and the second threshold is less than or equal to 0. The first threshold and the second threshold can be set according to seasonal changes in the area where the device is located, and parameter values ​​for different seasons can be set. When the temperature is low and the environment is dry in winter, the first threshold and the second threshold can be appropriately increased, and when the temperature is high and the environment is humid in summer, the first threshold and the second threshold can be appropriately lowered.

[0063] Further, the calculation to obtain the real-time water flow of the tidal drainage pipe includes:

[0064] A moisture content detection instrument with industrial network communication function is arranged on the dehumidification pipe of the tofu drying machine to detect the moisture content of the air in the dehumidification pipe;

[0065] A wind speed detection instrument with industrial network communication function is arranged in the dehumidification duct of the tofu drying machine to detect the air flow rate in the dehumidification duct;

[0066] Obtaining the diameter of the dehumidification pipe, and calculating the gas flow rate in the dehumidification pipe according to the diameter of the dehumidification pipe and the air flow rate in the dehumidification pipe;

[0067] The real-time water flow in the dehumidification pipe is calculated by multiplying the gas flow in the dehumidification pipe by the moisture content of the air in the dehumidification pipe.

[0068] Further, the calculation to obtain the real-time water flow rate of the hot air duct includes:

[0069] A moisture content detection instrument with an industrial network communication function is arranged on the hot air inlet duct of the tofu drying machine to detect the moisture content of the air in the hot air inlet duct;

[0070] A wind speed detection instrument with an industrial network communication function is arranged in the hot air inlet duct of the tofu drying machine to detect the air flow rate in the hot air inlet duct;

[0071] Obtaining the diameter of the hot air duct, and calculating the gas flow in the hot air inlet duct according to the diameter of the hot air duct and the air flow rate in the hot air inlet duct;

[0072] The real-time water flow in the hot air inlet pipe is obtained by multiplying the gas flow in the hot air inlet pipe by the air humidity content in the hot air inlet pipe.

[0073] The method also includes: when the negative pressure value is lower than a third threshold, an environmental pollution alarm is issued to the system. The third threshold can be determined by observing whether the inlet and outlet of the tofu drying machine blow air outward during production. When blowing air outward, the third threshold is increased.

[0074] The method further includes: when the negative pressure value is higher than a fourth threshold, an alarm is sent to the system indicating that the tobacco surface is too dry, and the fourth threshold can be determined by the detection value of the moisture meter at the outlet of the tobacco storage cabinet, and when the detection value of the moisture meter at the outlet is too low, the fourth threshold is lowered. The third threshold and the fourth threshold should be negative pressure values, not positive pressure values.

[0075] In practical applications, such as Figure 3 As shown, the hot air blower extracts fresh air from outside the tobacco drying machine and enters the pipe 3 through the fresh air port 2. After the fresh air is heated by the radiator of steam energy, it will be detected by the temperature sensor installed on the upward pipe. By adjusting the steam pressure at the inlet of the radiator pipe, the fresh air is heated to the hot air temperature set by the process parameters, and then becomes hot air. It is divided into two paths upward through the pipe 3. One path is the forward hot air forward pipe 4 entering the drum 1, and the other path is the backward hot air backward pipe 5 directly entering the dehumidification pipe 9. The upward pipe 3 is arranged with a volumetric moisture content detection instrument 8 and a wind speed sensor 11. After collecting the volumetric moisture content and the wind speed value in the pipe, the real-time water flow here is calculated. After the tobacco entering from the entrance of the drum 1 is baked, the moisture is released into the air, resulting in an increase in the moisture content of the air in the drum. When the dry hot air blown in by the hot air pipe enters the drum, the moisture content of the air in the drum decreases. A negative pressure sensor 7 is installed in the rear chamber 6 of the drum to detect the real-time negative pressure value in the drum. A dehumidification damper is provided in the dehumidification duct 9, and the opening of the dehumidification damper can be adjusted according to the real-time negative pressure value. A volumetric moisture content detection instrument 10 and a wind speed sensor 11 are arranged in the dehumidification duct 9, and after collecting the volumetric moisture content and the wind speed value in the duct, the real-time water flow rate here is calculated; because the dust in the dehumidification duct 9 is relatively large, the volumetric moisture content detection instrument 10 and the wind speed sensor 11 increase the timed compressed air air pipe 12 to ensure the sensor detection accuracy; the difference is obtained by subtracting the water flow in the dehumidification duct 9 from the water flow in the hot air inlet duct 3, that is, the real-time water removal amount in the dehumidification duct 9 is obtained.

[0076] It can be seen that the present invention provides a method for controlling the roller negative pressure and tobacco moisture of a thin-plate wire drying machine. By establishing a first PID control model and a second PID control model and forming a cascade PID adjustment structure, a two-stage serial negative feedback control is formed for the target water removal amount, real-time water removal amount, roller negative pressure, and moisture exhaust door opening of the wire drying machine. This solves the problem that the tobacco moisture control fluctuation of the thin-plate wire drying machine is easily affected by the seasons, and can improve the continuity of the moisture and negative pressure regulation of the wire drying machine, and ultimately improve the accuracy of the tobacco moisture content control.

[0077] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. A method for controlling the negative pressure of the roller and the moisture content of tobacco in a thin-plate tobacco drying machine. It is characterized in that include: Obtaining the real-time water removal amount and the target water removal amount of the moisture removal pipe of the thin plate wire drying machine, setting a first PID control model for performing PID control on the target negative pressure value of the wire drying machine drum according to the target water removal amount and the real-time water removal amount; Obtaining a real-time negative pressure value in the drum of the tofu drying machine, and setting a second PID control model for performing PID control on a target dehumidification air door opening value according to the real-time negative pressure value and the target negative pressure value; The first PID control model and the second PID control model form a cascade PID adjustment structure, and adjust the real-time water removal amount of the tofu drying machine according to the target moisture removal air door opening value.

2. The method for controlling the negative pressure of the roller and the moisture content of the tobacco shreds of the thin-plate tobacco drying machine according to claim 1, It is characterized in that The method of obtaining the real-time water removal amount of the moisture removal pipeline of the thin-plate tofu drying machine comprises: Obtain the volumetric moisture content, wind speed and diameter of the dehumidification pipe of the tofu drying machine, and calculate the real-time water flow of the dehumidification pipe; Obtain the volumetric moisture content, wind speed and diameter of the hot air inlet duct of the tofu drying machine, and calculate the real-time water flow in the hot air duct; The real-time water flow rate of the dehumidification pipe is subtracted from the real-time water flow rate of the hot air pipe to obtain the real-time water removal amount of the dehumidification pipe.

3. The method for controlling the negative pressure of the roller and the moisture content of the tobacco shreds of the thin-plate tobacco drying machine according to claim 2, It is characterized in that The PID control of the target negative pressure value of the tomato drying machine drum according to the target water removal amount and the real-time water removal amount includes: A first difference e1 between the target water removal amount and the real-time water removal amount is used as an input of the first PID control model to obtain a target negative pressure value.

4. The method for controlling the negative pressure of the roller and the moisture content of the tobacco shreds of the thin-plate tobacco drying machine according to claim 3, It is characterized in that The PID control of the opening value of the dehumidification damper according to the real-time negative pressure value and the target negative pressure value comprises: The target negative pressure value is subtracted from the real-time negative pressure value to obtain a second difference e2, and the second difference e2 is used as an input of the second PID control model to obtain a target dehumidification damper opening value.

5. The method for controlling the negative pressure of the roller and the moisture content of the tobacco shreds of the thin-plate tobacco drying machine according to claim 4, It is characterized in that Also includes: When the first difference e1 is greater than a first threshold, the target negative pressure value is increased and adjusted by the first PID control model; When the target negative pressure value is greater than the real-time negative pressure, the damper opening of the dehumidification duct is adjusted by the second PID control model to increase the dehumidification air volume, thereby increasing the dehumidification water removal amount.

6. The method for controlling the negative pressure of the roller and the moisture content of the tobacco shreds of the thin-plate tobacco drying machine according to claim 5, It is characterized in that Also includes: When the first difference e1 is less than a second threshold, the target negative pressure value is adjusted by the first PID control model, and the second threshold is less than the first threshold; When the target negative pressure value is less than the real-time negative pressure, the damper opening of the dehumidification duct is adjusted by the second PID control model to reduce the dehumidification air volume, thereby reducing the dehumidification water removal amount, so as to reduce the difference between the target water removal amount and the real-time water removal amount.

7. The method for controlling the negative pressure of the roller and the moisture content of the tobacco shreds of the thin-plate tobacco drying machine according to claim 6, It is characterized in that Also includes: The volumetric moisture content of the dehumidification duct and the hot air inlet duct of the tofu drying machine, the duct wind speed and the real-time water removal amount of the dehumidification duct corresponding to each batch are obtained, and the corresponding average values ​​are used for regression analysis of the target water removal amount of the feedforward control process parameter to correct the target water removal amount.

8. The method for controlling the negative pressure of the roller and the moisture content of the tobacco shreds of the thin-plate tobacco drying machine according to claim 7, It is characterized in that Also includes: The real-time water removal amount of the dehumidification pipe and the average value of the target water removal amount in each batch are obtained, and the corresponding average values ​​are used for regression analysis of the first threshold and the second threshold to correct the first threshold and the second threshold.

9. The method for controlling the negative pressure of the roller and the moisture content of the tobacco shreds of the thin-plate tobacco drying machine according to claim 8, It is characterized in that The calculation to obtain the real-time water flow in the tidal drainage pipe includes: A moisture content detection instrument with industrial network communication function is arranged on the dehumidification pipe of the tofu drying machine to detect the moisture content of the air in the dehumidification pipe; A wind speed detection instrument with industrial network communication function is arranged in the dehumidification duct of the tofu drying machine to detect the air flow rate in the dehumidification duct; Obtaining the diameter of the dehumidification pipe, and calculating the gas flow rate in the dehumidification pipe according to the diameter of the dehumidification pipe and the air flow rate in the dehumidification pipe; The real-time water flow in the dehumidification pipe is calculated by multiplying the gas flow in the dehumidification pipe by the moisture content of the air in the dehumidification pipe.

10. The method for controlling the negative pressure of the drum and the moisture content of the tobacco shreds of the thin-plate tobacco drying machine according to claim 9, It is characterized in that The calculation to obtain the real-time water flow in the hot air duct includes: A moisture content detection instrument with an industrial network communication function is arranged on the hot air inlet duct of the tofu drying machine to detect the moisture content of the air in the hot air inlet duct; A wind speed detection instrument with an industrial network communication function is arranged in the hot air inlet duct of the tofu drying machine to detect the air flow rate in the hot air inlet duct; Obtaining the diameter of the hot air duct, and calculating the gas flow in the hot air inlet duct according to the diameter of the hot air duct and the air flow rate in the hot air inlet duct; The real-time water flow in the hot air inlet pipe is obtained by multiplying the gas flow in the hot air inlet pipe by the air humidity content in the hot air inlet pipe.

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