Method for controlling water adding uniformity in tobacco leaf moistening and charging procedures in cigarette cut tobacco making process

Abstract

The invention belongs to the technical field of tobacco shred processing, and particularly relates to a water adding uniformity control method for a leaf moistening and charging procedure in a cigarette shred processing technology, which adopts a two-stage water adding flow control method and comprises the following steps: firstly, establishing a regression model based on historical production data, and quickly determining an initial water adding flow; therefore, the problem of response lag caused by feedback signal transmission delay is effectively reduced. Then, on the basis of the water adding flow set in the first stage, the water adding flow is optimized and adjusted through real-time monitoring and accurate calculation in the second stage, the water adding error is further reduced, and the consistency of the moisture of tobacco leaves at a tobacco moistening and charging outlet is ensured. And the stability of the product quality is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco shred processing, and in particular relates to a method for controlling water addition uniformity in a leaf moistening and feeding procedure in a cigarette shred processing process. Background Art

[0002] In the prior art, the tobacco shred processing technology includes: loosening and rehydrating, pre-arranged leaf storage, screening, quantitative feeding, leaf moistening and feeding, leaf matching and storage, shredding, drying, blending, blending and flavoring. The leaf moistening and feeding process is a key link in the tobacco shred production, and the stability of its outlet moisture directly affects the processing quality of subsequent processes. At present, the leaf moistening and feeding process mainly adopts a feedback control scheme for the control of the outlet moisture content. The scheme mainly uses a moisture detection device at the outlet of the leaf moistening and feeding to detect the moisture content of the tobacco leaves after the leaf moistening and feeding in real time, and feeds back the acquired moisture value to the controller. If the actual outlet moisture is lower than the set value, the controller will control the relevant mechanism to increase the water addition flow rate according to the signal to increase the moisture content of the tobacco shreds. On the contrary, if the actual outlet moisture is higher than the set value, the relevant structure is controlled to reduce the water addition flow rate to maintain the moisture content of the tobacco leaves at the outlet of the leaf moistening and feeding to remain consistent.

[0003] However, the entire process of using the feedback control solution involves signal transmission and processing in multiple links, and there are inevitable time delays, resulting in slow response speed. Not only that, the differences in characteristics between tobacco leaf batches and fluctuations in ambient temperature and humidity will also cause interference. It is necessary to iterate and adjust the control parameters repeatedly before the system can gradually stabilize, which greatly affects the production efficiency and product quality stability.

[0004] At the same time, in the production process of tobacco leaves and leaf moistening and feeding procedures, due to the wide range of sources of tobacco leaves, there are significant differences in their color, origin, variety, etc. These differences will affect the detection accuracy of the moisture meter, causing the zero point of the moisture meter to shift, causing the detected moisture value to deviate, and then causing the target value in the feedback control system to be inaccurate, and ultimately resulting in uneven residuals in the moisture content of the tobacco leaves at the leaf moistening and feeding outlet.

[0005] In order to solve the above-mentioned problems, the present invention is proposed. Summary of the invention

[0006] In view of the problem of uneven water addition in the leaf moistening and feeding process in the cigarette silk making process caused by slow response speed and untimely adjustment of water flow rate brought about by the prior art reliance on feedback control schemes, a method for controlling water addition uniformity in the leaf moistening and feeding process in the cigarette silk making process is provided. The present invention solves the problems of response lag and uneven water addition in traditional technologies through an innovative two-stage water addition uniformity control method, can achieve efficient and precise water addition control, adapt to the differences in characteristics of different batches of tobacco leaves, and significantly improve the production efficiency of the cigarette silk making process and the consistency of product quality.

[0007] The technical solution adopted by the present invention is:

[0008] A method for controlling water addition uniformity in a leaf moistening and feeding process in a cigarette shred process is provided, wherein the control method adopts a two-stage leaf moistening and feeding process water addition flow control, and comprises the following steps:

[0009] Step (1), establishing a regression equation between moisture increase value and water addition amount based on the moisture value at the leaf moistening feed inlet, the moisture value at the leaf moistening feed outlet, and the actual water addition amount during the leaf moistening feed process of historical batches;

[0010] Step (2), establishing a weight coefficient based on the weight of the tobacco leaves after loosening and rehydration of each batch and the weight of the tobacco leaves before moistening and adding materials;

[0011] Step (3), taking the arithmetic mean of the actual water addition amount of each batch of leaf moistening and feeding process obtained in step (1) to obtain the water addition amount of the first-stage leaf moistening and feeding process, and calculating the water addition flow rate Q of the first-stage leaf moistening and feeding process according to the water addition amount of the first-stage leaf moistening and feeding process, the weight coefficient obtained in step (2), the set value of the tobacco flow rate at the leaf moistening and feeding inlet of this batch, and the weight of the tobacco leaves after loosening and rehydration of this batch;

[0012] Step (4), maintaining the water addition flow rate of the first stage leaf moistening and feeding process determined in step (3) until the moisture data of the tobacco leaves at the leaf moistening and feeding outlet is stable, and then optimizing the amount of water added to the leaf moistening and feeding according to the actual moisture value at the leaf moistening and feeding inlet and the set moisture value at the leaf moistening and feeding outlet to obtain the amount of water added to the leaf moistening and feeding in the second stage;

[0013] Step (5), establishing a regression equation based on historical batch data including: weight of tobacco leaves after loosening and rehydration, moisture at the loosening and rehydration outlet, weight of tobacco leaves before leaf moistening and feeding, and moisture value at the leaf moistening and feeding inlet; according to the regression equation for weight of tobacco leaves at the leaf moistening and feeding inlet, replacing weight of tobacco leaves after loosening and rehydration and moisture value at the loosening and rehydration outlet with the real values ​​during the production of this batch; the moisture value at the leaf moistening and feeding inlet is the actual moisture value at the leaf moistening and feeding inlet measured when the water flow rate of the first stage leaf moistening and feeding process is continuously added, and finally obtaining the optimized predicted weight of tobacco leaves at the leaf moistening and feeding inlet;

[0014] Step (6) calculates the water flow rate H of the second-stage leaf moistening process based on the amount of water added for the second-stage leaf moistening process obtained in step (4), the predicted tobacco weight of the optimized leaf moistening inlet obtained in step (5), the amount of water applied in the first-stage leaf moistening process in step (3), the weight of the tobacco leaves added, and the set value of the tobacco flow rate at the leaf moistening inlet, and uses the water flow rate H of the second-stage leaf moistening process as the water flow rate for the subsequent leaf moistening process.

[0015] Preferably, the method for establishing the regression equation of moisture gain and water addition amount in step (1) is: obtaining the moisture value of the leaf moistening feeding inlet of each batch, the moisture value of the leaf moistening feeding outlet of each batch, and the actual water addition amount of each batch of leaf moistening feeding process in historical batches of the same production brand, and establishing a regression equation based on the above historical data with the moisture gain as the dependent variable and the water addition amount as the independent variable:

[0016] Moisture increase value = a + b × amount of water added, where a is the constant term and b is the regression coefficient.

[0017] Preferably, the method for establishing the weight coefficient in step (2) is: synchronously collect the weight of each batch of tobacco leaves after loosening and moistening and the weight of each batch of tobacco leaves before moistening and adding materials in the historical batches of the production brand in step (1), and calculate the arithmetic mean respectively to obtain the weight of the tobacco leaves after loosening and moistening and the weight of the tobacco leaves before moistening and adding materials, according to:

[0018]

[0019] Get the weight factor.

[0020] Preferably, the method for determining the water addition flow rate of the first stage leaf moistening and feeding process during formal production in step (3) is as follows: taking the arithmetic mean of the actual water addition amount of each batch of leaf moistening and feeding process obtained in step (1) to obtain the water addition amount of the first stage leaf moistening and feeding process; and calculating the water addition flow rate Q of the first stage leaf moistening and feeding process according to the water addition amount of the first stage leaf moistening and feeding process, the weight coefficient obtained in step (2), the set value of the tobacco flow rate at the leaf moistening and feeding inlet of this batch, and the weight of the tobacco leaves after loosening and rehydration of this batch:

[0021]

[0022] Preferably, the method for determining the water addition flow rate of the second stage leaf moistening and feeding process during formal production in step (4) is: maintaining the water addition flow rate of the first stage leaf moistening and feeding process determined in step (3) until the tobacco moisture data at the leaf moistening and feeding outlet is stable, and then optimizing the leaf moistening and feeding water addition amount according to the actual moisture value at the leaf moistening and feeding inlet and the set moisture value at the leaf moistening and feeding outlet according to the following formula:

[0023] Among them, a is the constant term, b is the regression coefficient, and the amount of material and water added for leaf moisturizing in the second stage is obtained.

[0024] Preferably, the method for establishing the regression equation of the weight of tobacco leaves at the entrance of moistening and feeding in step (5) is to obtain the regression equation through regression analysis based on historical batch data including: weight of tobacco leaves after loosening and moistening, moisture value at the exit of loosening and moistening, weight of tobacco leaves before moistening and feeding, and moisture value at the entrance of moistening and feeding:

[0025] The weight of tobacco leaves at the entrance of moistening and feeding = MM + SM × weight of tobacco leaves after loosening and moistening + SS × moisture at the outlet of loosening and moistening + RS × moisture value at the entrance of moistening and feeding, where MM is the weight constant, SM is the weight coefficient of tobacco leaves after loosening and moistening, SS is the moisture coefficient at the outlet of loosening and moistening, and RS is the moisture coefficient at the entrance of moistening and feeding;

[0026] According to the regression equation of the tobacco leaf weight at the leaf moistening and feeding inlet, the weight of the tobacco leaves after loosening and rehydration and the moisture content at the loosening and rehydration outlet are replaced with the real values ​​during the production of this batch. The moisture value at the leaf moistening and feeding inlet is the actual moisture value measured when the water flow rate of the first stage leaf moistening and feeding process is continuously added, and finally the optimized predicted tobacco leaf weight at the leaf moistening and feeding inlet is obtained.

[0027] Preferably, the method for determining the water flow rate of the second-stage leaf moistening and feeding process during formal production in step (6) is to calculate the water flow rate H of the second-stage leaf moistening and feeding process based on the water amount of the second-stage leaf moistening and feeding obtained in step (4), the predicted tobacco leaf weight at the optimized leaf moistening and feeding inlet obtained in step (5), the amount of water applied in the first-stage leaf moistening and feeding process in step (3), the weight of the tobacco leaves added, and the set value of the tobacco flow rate at the leaf moistening and feeding inlet, and to obtain the water flow rate H of the second-stage leaf moistening and feeding process:

[0028] .

[0030] Preferably, in step (1), the moisture increase value of each batch = the moisture value at the outlet of each batch of leaf moistening feed - the moisture value at the inlet of each batch of leaf moistening feed.

[0031] In order to more quickly determine and control the water flow rate of the leaf moistening and feeding process of this batch, the above control method can be written into a computer program to realize automatic calculation and control of the cigarette silk making equipment.

[0032] Beneficial effects of the present invention:

[0033] 1. The present invention adopts a two-stage water addition flow control method. First, a regression model is established based on historical production data (including the inlet moisture value, outlet moisture value and actual water addition amount of each batch of leaf moistening feed), and the initial water addition flow rate is quickly determined, thereby effectively reducing the response lag problem caused by the feedback signal transmission delay. Then, based on the water addition flow rate set in the first stage, the second stage optimizes and adjusts the water addition flow rate through real-time monitoring and precise calculation, further reducing the water addition error and ensuring the consistency of the moisture content of the tobacco leaves at the outlet of the leaf moistening feed. The present invention significantly improves production efficiency and ensures the stability of product quality through precise water addition control;

[0034] In addition, once the water flow rate of the second-stage leaf moistening and feeding process is determined, the subsequent production of the batch can be carried out continuously according to this value, which can avoid the problem of uneven moisture content of the tobacco leaves after the leaf moistening and feeding process due to the increase in errors in water flow control caused by equipment errors.

[0035] 2. The present invention can flexibly adapt to the differences in characteristics of different batches of tobacco leaves by establishing a regression model based on historical data. By calculating the weight coefficient and combining parameters such as the weight of the tobacco leaves after loosening and regaining moisture, the water addition flow rate is optimized, so that each batch of tobacco leaves can be accurately controlled in the leaf moistening and feeding process, avoiding the negative impact of differences between different batches of tobacco leaves on the water addition effect.

[0036] 3. The present invention uses historical data and regression analysis for prediction and optimization, thereby reducing the frequent adjustment of system parameters during the production process, thereby effectively avoiding the impact of environmental changes and differences in tobacco leaf characteristics on moisture measurement, and further reducing the error of water addition flow rate. In the initial stage, historical data is used to determine the initial water addition amount; then, optimization and adjustment are performed based on actual production data to determine the water addition flow rate H for the second stage, and it is used as the water addition flow rate for subsequent leaf moistening and feeding processes. This method reduces the frequency of adjustment and makes the system more stable and simple.

[0037] Instruction Manual

[0038] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 This is a flow chart of an implementation method of the control method of the present invention; DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the examples, but is not intended to limit the present invention. Any changes or improvements made based on the teachings of the present invention fall within the scope of protection of the present invention. If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the art or in accordance with the product instructions are used.

[0041] Example 1

[0042] like Figure 1As shown, the existing tobacco shred processing technology includes the following steps in sequence: loosening and moistening, pre-allocation and storage of leaves, screening, quantitative feeding, leaf moistening and feeding, leaf matching and storage, shredding, shredding, blending, blending and flavoring, among which, after the tobacco leaves are loosened and moistened, the weight of the tobacco leaves after loosening and moistening will be obtained by electronic weighing. After the pre-allocation and storage of leaves and screening steps, the tobacco leaves will be sent to the leaf moistening and feeding step for leaf moistening and feeding. In this process, after the loosening and moistening step is completed, the MES system records the weight of the tobacco leaves after loosening and moistening and the moisture content at the loosening and moistening outlet. After the tobacco leaves are stored in the pre-allocation and storage cabinet, they are moistened and fed. The MES system collects the weight of the tobacco leaves at the leaf moistening and feeding inlet and the moisture content at the leaf moistening and feeding inlet in real time. At the same time, the water adding system of the leaf moistening and feeding machine is provided with a flow meter and transmits data to the MES system in real time, which is used to record the applied water flow and the applied water weight in real time. Therefore, before the leaf moistening and feeding process is carried out on this batch of tobacco leaves, data such as the weight of the tobacco leaves after loosening and rehydrating, the moisture content at the loosening and rehydrating outlet, the weight of the tobacco leaves at the leaf moistening inlet, the moisture content at the leaf moistening inlet, the amount of water added for leaf moistening, and the moisture content at the leaf moistening outlet of multiple historical batches can be obtained.

[0043] In order to intuitively present the control method of the present invention, this embodiment takes the historical batch data of the same specification and brand produced within a period of time as an example for further explanation, as shown in the following Table 1:

[0044] Table 1 Historical data table of a certain brand

[0045]

[0046] The unit of the weight of loose and rehumidified tobacco leaves at the export and the weight of tobacco leaves at the import for moistening and feeding is "KG"; the unit of the moisture value at the loose and rehumidified outlet, the moisture value at the import for moistening and feeding, the moisture value at the export for moistening and feeding, and the moisture increase value of moistening and feeding is "%"; the unit of the amount of water added for moistening and feeding is "L".

[0047] Initially, the method performs calculations based on historical data:

[0048] In the above historical data, the water increase value of the leaf moistening additive is the dependent variable, and the amount of water added to the leaf moistening additive is used as the independent variable to make a regression equation, and a is 3.8952, b is 0.0064, and the specific regression equation is:

[0049] Moisture increase value of leaf moistening feed = moisture at leaf moistening feed outlet - moisture at leaf moistening feed inlet = 3.8952 + 0.0064 × amount of water added to leaf moistening feed;

[0050] Weight coefficient = average weight of loose and moistened tobacco leaves in historical batches ÷ average weight of moistened and fed tobacco leaves in historical batches = 10526.70KG ÷ 10111.75KG = 1.041;

[0051] When this batch of production is being carried out (this batch is named Batch 28), the weight of loose rehumidification outlet tobacco leaves, the moisture content of loose rehumidification outlet, and the flow rate setting values ​​of moistening and feeding inlet are known before the start of moistening and feeding, as shown in the following table:

[0052] Table 2 Batch 28 data sheet

[0053] batch Weight of loose rehydrated tobacco leaves for export Loose moisture outlet Tobacco flow setting value at the leaf moistening and feeding inlet Batch 28 10509.70KG 16.88％ 5800KG / H

[0054] According to the weight coefficient calculated from the above historical data and the weight of the loose rehumidified tobacco leaves exported from this batch 28, the weight of the tobacco leaves imported from this batch 28 for moistening and feeding can be obtained as 10509.70KG÷1.041=10095.77KG; at the same time, according to the historical data, the total water addition amount of moistening and feeding is 28.44L, and the water addition flow rate of the first stage moistening and feeding process can be calculated as Q=28.44÷10095.77×5800=16.34L / H;

[0055] According to the above historical data, through regression analysis, the regression equation of the weight of tobacco leaves at the entrance of moistening and feeding, the weight of tobacco leaves at the exit of loose moisture recovery, the moisture value at the exit of loose moisture recovery, and the moisture value at the entrance of moistening and feeding was obtained, among which MM is 2967, SM is 0.681, SS is 6.4, RS is 8.2, and the regression equation is weight of tobacco leaves at the entrance of moistening and feeding = 2967 + 0.681 × weight of tobacco leaves at the exit of loose moisture recovery + 6.4 × moisture value at the exit of loose moisture recovery - 8.2 × moisture value at the entrance of moistening and feeding.

[0056] After a period of production, the stable value of the moisture content of the inlet of the moistening feed for this batch is 16.26%. At this time point, the weight of the tobacco leaves added in the first stage is 483.33KG, the amount of water applied in the first stage is 2.133L, and the moisture content of the moistening feed outlet is set to 20.40%. It can be calculated that the amount of water added to the moistening feed in the first stage = (20.40-16.26-3.8952) ÷ 0.0064 = 38.25L;

[0057] Optimized batch 28 moistening and feeding entrance tobacco leaf weight = 2967 + 0.681 × 10509.70 + 6.4 × 16.88-8.2 × 16.26 = 10098.80KG;

[0058] It can be further calculated that the water addition flow rate of the second stage leaf moistening and feeding process is H = (38.25-2.133) ÷ (10098.80-483.33) × 5800 = 21.79 L / H.

[0059] According to the above method, this embodiment also carried out multiple batches of production verification. By using the control method of the present invention, the moisture content of the tobacco leaves at the final moistening and feeding outlet deviated from the preset value by no more than 0.10%. The method of the present invention reduces the problems of slow response speed and untimely water flow adjustment caused by feedback control while ensuring the uniformity of water addition, reduces the error of water addition, and improves the uniformity of water addition between batches.

[0060] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and detail without departing from the scope defined by the claims of the present application. The dimensions described in the drawings and embodiments are not related to the specific objects and are not used to limit the protection scope of the present application. The dimensions of the objects can be selected and changed according to actual needs.

Claims

1. A method for controlling water addition uniformity in a leaf moistening and feeding process in a cigarette shred process, characterized in that: The control method adopts a two-stage leaf moistening and feeding process to control the water flow rate, and includes the following steps: Step (1), establishing a regression equation between moisture increase value and water addition amount based on the moisture value at the leaf moistening feed inlet, the moisture value at the leaf moistening feed outlet, and the actual water addition amount during the leaf moistening feed process of historical batches; Step (2), establishing a weight coefficient based on the weight of the tobacco leaves after loosening and rehydration of each batch and the weight of the tobacco leaves before moistening and adding materials; Step (3), taking the arithmetic mean of the actual water addition amount of each batch of leaf moistening and feeding process obtained in step (1) as the water addition amount of the first-stage leaf moistening and feeding process, and calculating the water addition flow rate Q of the first-stage leaf moistening and feeding process according to the water addition amount of the first-stage leaf moistening and feeding process, the weight coefficient obtained in step (2), the set value of the tobacco flow rate at the leaf moistening and feeding inlet of this batch, and the weight of the tobacco leaves after loosening and rehydration of this batch; Step (4), maintaining the water addition flow rate of the first stage leaf moistening and feeding process determined in step (3) until the moisture data of the tobacco leaves at the leaf moistening and feeding outlet is stable, and then optimizing the amount of water added to the leaf moistening and feeding according to the actual moisture value at the leaf moistening and feeding inlet and the set moisture value at the leaf moistening and feeding outlet to obtain the amount of water added to the leaf moistening and feeding in the second stage; Step (5), establishing a regression equation based on historical batch data including: weight of tobacco leaves after loosening and rehydration, moisture at the loosening and rehydration outlet, weight of tobacco leaves before leaf moistening and feeding, and moisture value at the leaf moistening and feeding inlet; according to the regression equation for weight of tobacco leaves at the leaf moistening and feeding inlet, replacing weight of tobacco leaves after loosening and rehydration and moisture value at the loosening and rehydration outlet with the real values ​​during the production of this batch; the moisture value at the leaf moistening and feeding inlet is the actual moisture value at the leaf moistening and feeding inlet measured when the water flow rate of the first stage leaf moistening and feeding process is continuously added, and finally obtaining the optimized predicted weight of tobacco leaves at the leaf moistening and feeding inlet; Step (6) calculates the water flow rate H of the second-stage leaf moistening process based on the amount of water added for the second-stage leaf moistening process obtained in step (4), the predicted tobacco weight of the optimized leaf moistening inlet obtained in step (5), the amount of water applied in the first-stage leaf moistening process in step (3), the weight of the tobacco leaves added, and the set value of the tobacco flow rate at the leaf moistening inlet, and uses the water flow rate H of the second-stage leaf moistening process as the water flow rate for the subsequent leaf moistening process.

2. The method for controlling water addition uniformity in the leaf moistening and feeding process in the cigarette shredding process according to claim 1, characterized in that: The method for establishing the regression equation of moisture increase value and water addition amount in step (1) is as follows: obtaining the moisture value of the leaf moistening feed inlet of each batch, the moisture value of the leaf moistening feed outlet of each batch, and the actual water addition amount of each batch in the leaf moistening feed process in the historical batches of the same production brand, and establishing a regression equation based on the above historical data with the moisture increase value as the dependent variable and the water addition amount as the independent variable: Moisture increase value = a + b × amount of water added, where a is the constant term and b is the regression coefficient.

3. The method for controlling water addition uniformity in the leaf moistening and feeding process in the cigarette shredding process according to claim 1, characterized in that: The method for establishing the weight coefficient in step (2) is: synchronously collect the weight of each batch of tobacco leaves after loosening and moistening and the weight of each batch of tobacco leaves before moistening and adding materials in the historical batches of the production brand in step (1), and calculate the arithmetic mean respectively to obtain the weight of the tobacco leaves after loosening and moistening and the weight of the tobacco leaves before moistening and adding materials, according to: Get the weight factor.

4. The method for controlling water addition uniformity in the leaf moistening and feeding process in the cigarette shredding process according to claim 1, characterized in that: The method for determining the water addition flow rate of the first stage leaf moistening and feeding process during formal production in step (3) is as follows: taking the arithmetic mean of the actual water addition amount of each batch of leaf moistening and feeding process obtained in step (1) to obtain the water addition amount of the first stage leaf moistening and feeding process; and calculating the water addition flow rate Q of the first stage leaf moistening and feeding process according to the total water addition amount of the first stage leaf moistening and feeding process, the weight coefficient obtained in step (2), the set value of the tobacco flow rate at the leaf moistening and feeding inlet of this batch, and the weight of the tobacco leaves after loosening and rehydration of this batch:

5. The method for controlling water addition uniformity in the leaf moistening and feeding process in the cigarette shredding process according to claim 1, characterized in that: The method for determining the water addition flow rate of the second stage leaf moistening and feeding process during formal production in step (4) is: maintaining the water addition flow rate of the first stage leaf moistening and feeding process determined in step (3) until the tobacco moisture data at the leaf moistening and feeding outlet is stable, and then optimizing the leaf moistening and feeding water addition amount according to the actual moisture value of the leaf moistening and feeding inlet and the set moisture value of the leaf moistening and feeding outlet according to the following formula: Among them, a is the constant term, b is the regression coefficient, and the amount of material and water added for leaf moisturizing in the second stage is obtained.

6. The method for controlling water addition uniformity in the leaf moistening and feeding process in the cigarette shred production process according to claim 1, characterized in that: The method for establishing the regression equation of the weight of tobacco leaves at the entrance of moistening and feeding in step (5) is to obtain the regression equation through regression analysis based on historical batch data including: weight of tobacco leaves after loosening and moistening, moisture at the exit of loosening and moistening, weight of tobacco leaves before moistening and feeding, and moisture value at the entrance of moistening and feeding: The weight of tobacco leaves at the entrance of moistening and feeding = MM + SM × weight of tobacco leaves after loosening and moistening + SS × moisture at the outlet of loosening and moistening + RS × moisture value at the entrance of moistening and feeding, where MM is the weight constant, SM is the weight coefficient of tobacco leaves after loosening and moistening, SS is the moisture coefficient at the outlet of loosening and moistening, and RS is the moisture coefficient at the entrance of moistening and feeding; According to the regression equation of the tobacco leaf weight at the leaf moistening and feeding inlet, the weight of the tobacco leaves after loosening and rehydration and the moisture content at the loosening and rehydration outlet are replaced with the real values ​​during the production of this batch. The moisture value at the leaf moistening and feeding inlet is the actual moisture value measured when the water flow rate of the first stage leaf moistening and feeding process is continuously added, and finally the optimized predicted tobacco leaf weight at the leaf moistening and feeding inlet is obtained.

7. The method for controlling water addition uniformity in the leaf moistening and feeding process in the cigarette shredding process according to claim 1, characterized in that: The method for determining the water flow rate of the second-stage leaf moistening and feeding process during formal production in step (6) is to calculate the water flow rate H of the second-stage leaf moistening and feeding process based on the water amount of the second-stage leaf moistening and feeding obtained in step (4), the predicted tobacco weight of the optimized leaf moistening and feeding inlet obtained in step (5), the amount of water applied in the first-stage leaf moistening and feeding process in step (3), the weight of the tobacco leaves added, and the set value of the tobacco flow rate of the leaf moistening and feeding inlet, and obtain the following:

8. The method for controlling water addition uniformity in the leaf moistening and feeding process in the cigarette shredding process according to claim 1, characterized in that: In the step (1), the moisture increase value of each batch = the moisture value at the outlet of each batch of leaf moistening feed - the moisture value at the inlet of each batch of leaf moistening feed.

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