A method for shortening the non-steady state time of the moisture content of tobacco leaves at the outlet of a loose leaf re-dryer

Abstract

The present invention discloses a method for shortening the unsteady state time of the moisture content of tobacco leaves at the outlet of a loose leaf re-dryer, which includes: gradually increasing the rotational speed of the cylinder of the loose leaf re-dryer during the headstock stage, adjusting the water addition amounts at the front end and the rear end, so as to shorten the unsteady state time of the moisture content of tobacco leaves at the outlet of the loose leaf re-dryer when the moisture content of tobacco leaves at the headstock stage is between the sampling reference point and the set lower limit of the outlet moisture content; during the production stage, humidifying the tobacco leaves at a fixed rotational speed of the cylinder and a water addition amount at the rear end, so as to stabilize the steady state time of the moisture content of tobacco leaves at the outlet of the loose leaf re-dryer when the moisture content of tobacco leaves at the production stage is between the set lower limit of the outlet moisture content and the set upper limit of the outlet moisture content; during the tailstock stage, increasing the rotational speed of the loose leaf re-drying drum, reducing the return air temperature, and gradually reducing the water addition ratio, so as to shorten the unsteady state time of the moisture content of tobacco leaves at the outlet of the loose leaf re-dryer when the moisture content of tobacco leaves at the tailstock stage is between the set lower limit of the outlet moisture content and the sampling reference point. The present invention optimizes the control modes of the above-mentioned various stages, thereby shortening the unsteady state time of the loose leaf re-dryer.

Description

Technical Field

[0001] The present invention relates to the technical field of tobacco processing, and particularly relates to a method for shortening the unsteady state time of the moisture content of tobacco leaves at the outlet of a loose leaf conditioning machine. Background Art

[0002] Loose leaf conditioning is an important process in silk reeling production. Its task is to restore the softness and humidity of tobacco leaves, shorten the unsteady state time of the moisture content of tobacco leaves at the outlet during the leaf production process, and reduce the unsteady state index, which is one of the important objectives for improving the comprehensive evaluation of production manufacturing level - the process quality score.

[0003] The existing control methods mainly solve the problem of reducing the weight of tobacco leaves in the head and tail material stages of the loose leaf conditioning machine, but do not solve the problem of shortening the unsteady state time in the head material stage, production stage, and tail material stage. Summary of the Invention

[0004] In order to solve the problems raised in the background art, the purpose of the present invention is to provide a method for shortening the unsteady state time of the moisture content of tobacco leaves at the outlet of a loose leaf conditioning machine. By optimizing the control methods in the waiting material stage, starting stage, production stage, and tail material stage of loose leaf conditioning, and by adjusting the water addition amounts at the front and rear ends of the loose leaf conditioning machine and the cylinder rotation speed, the unsteady state time of the loose leaf conditioning machine is shortened.

[0005] The technical solution adopted by the present invention is: to provide a method for shortening the unsteady state time of the moisture content of tobacco leaves at the outlet of a loose leaf conditioning machine, including:

[0006] A. In the head material stage, gradually increase the cylinder rotation speed of the loose leaf conditioning machine, and adjust the water addition amounts at the front and rear ends to shorten the unsteady state time of the moisture content of the tobacco leaves at the outlet of the loose leaf conditioning machine when the moisture content of the tobacco leaves in the head material stage is between the sampling reference point and the set lower limit of the outlet moisture content;

[0007] B. In the production stage, humidify the tobacco leaves at a fixed cylinder rotation speed and the water addition amount at the rear end to stabilize the steady state time of the moisture content of the tobacco leaves at the outlet of the loose leaf conditioning machine when the moisture content of the tobacco leaves in the production stage is between the set lower limit of the outlet moisture content and the set upper limit of the outlet moisture content;

[0008] C. In the tail material stage, increase the rotation speed of the loose leaf conditioning drum, lower the return air temperature, and gradually reduce the water addition ratio to shorten the unsteady state time of the moisture content of the tobacco leaves at the outlet of the loose leaf conditioning machine when the moisture content of the tobacco leaves in the tail material stage is between the set lower limit of the outlet moisture content and the sampling reference point.

[0009] Further, step A specifically includes:

[0010] A1. Waiting material stage of the loose leaf conditioning machine:

[0011] Through the PID automatic adjustment of the opening degree of the thin film valve of the hot air heater in the loose leaf conditioning, control the steam amount of the hot air heater, and adjust the temperature inside the cylinder to the preheating temperature C0;

[0012] Adjust the rotating speed of the cylinder to the rotating speed R1 of the empty cylinder.

[0013] When the instantaneous flow rate of the tobacco leaves on the electronic belt scale in front of the loose and moistening machine is greater than the set value and the continuous passing time is greater than the time required for the tobacco leaves to reach the middle of the cylinder from the electronic belt scale, it enters the starting stage of the loose and moistening machine.

[0014] A2. Starting stage of the loose and moistening machine:

[0015] By fixing the opening of the thin film valve of the fixed hot air heater at 50%, keep the temperature of the hot air pipeline of the heater constant, and control the hot air temperature C1 by adjusting the opening of the compensating steam.

[0016] Adjust the rotating speed of the cylinder to the starting rotating speed R2 of the cylinder, and gradually increase the rotating speed R2 of the cylinder according to the cumulative amount of the electronic belt scale.

[0017] Adjust the water addition amount W1 at the front end and the water addition amount W2 at the rear end.

[0018] When the actual moisture content of the tobacco leaves detected by the moisture meter at the outlet of the loose and moistening machine is greater than the set outlet moisture value minus 2% and the continuous passing time is greater than T4, it enters the production stage of the loose and moistening machine.

[0019] Furthermore, step B specifically includes:

[0020] Adjust the rotating speed of the cylinder to the production rotating speed R3 of the cylinder, adjust the water addition amount W3 at the rear end, and humidify the tobacco leaves at a fixed production rotating speed R3 of the cylinder and the water addition amount W3 at the rear end.

[0021] When the instantaneous flow rate of the tobacco leaves on the electronic belt scale in front of the loose and moistening machine is less than the set value and the continuous passing time is greater than T5, it enters the tail material stage of the loose and moistening machine.

[0022] Furthermore, step C specifically includes:

[0023] Adjust the rotating speed of the cylinder to the tail material rotating speed R4 of the cylinder, and the tail material rotating speed R4 is greater than the production rotating speed R3 of the cylinder;

[0024] Adjust the opening of the thin film valve of the hot air heater Kp2 to 60%;

[0025] Close the water addition amount W4 at the front end; adjust the water addition amount W5 at the rear end, and the water addition ratio of the water addition amount W5 at the rear end gradually decreases over time;

[0026] Close the opening of the compensating steam to reduce the return air temperature C1;

[0027] When the loose and moistening machine enters the tail material stage, by adjusting the rotating speed of the drum, reduce the time of the tail material in the cylinder, and then cooperate with the water addition at the rear end and the control of the hot air temperature to increase the temperature and humidity of the tobacco leaves.

[0028] Furthermore, different water addition amounts are controlled at different stages:

[0029] During the start-up stage, the front-end water addition amount W1 = set water addition ratio * 0.7 * actual flow of the electronic belt scale of the conditioning unit; the rear-end water addition amount W2 = set water addition ratio * 0.3 * 0.175 / 100 * actual flow of the electronic belt scale of the conditioning unit;

[0030] During the production stage, the rear-end water addition amount W3 = set water addition ratio * 0.3 / 100 * actual flow of the electronic belt scale of the conditioning unit * (1 + (set moisture - actual outlet moisture));

[0031] During the tail material stage, the front-end water addition amount W4 = 0, and the rear-end water addition amount W5 gradually decreases with the time entering the tail material stage; specifically, after 30 seconds of entering the tail material stage, W5 = set water addition ratio * 0.3 / 100 * set flow of the electronic belt scale of the conditioning unit * (1 + (set outlet moisture - actual outlet moisture)); after 90 seconds of entering the tail material stage, W5 = set water addition ratio * 0.25 / 100 * set flow of the electronic belt scale of the conditioning unit * (1 + (set outlet moisture - actual outlet moisture)); after 150 seconds of entering the tail material stage, W5 = set water addition ratio * 0.2 / 100 * set flow of the electronic belt scale of the conditioning unit * (1 + (set outlet moisture - actual outlet moisture)).

[0032] The beneficial effects of the present invention are as follows: By optimizing the control methods in the loose conditioning waiting material stage, start-up stage, production stage, and tail material stage, the present invention realizes the adjustment of the front-end and rear-end water addition amounts and the adjustment of the cylinder rotation speed. These optimization measures effectively shorten the non-steady state time of the moisture of the tobacco leaves at the outlet of the loose conditioning, thereby reducing the non-steady state index. Through these improvements, the production and manufacturing level is improved, and the process quality score in the comprehensive evaluation is also increased. After using the method and the loose conditioning machine of the present invention, the non-steady state time of the moisture of the tobacco leaves at the outlet of the loose conditioning machine is shortened from 216 seconds to 42 seconds, the non-steady state index is reduced from 5.3 to 1.4, and the comprehensive evaluation - process quality score of the loose conditioning non-steady state production and manufacturing level is increased from 0 points to 2.25 points. Brief Description of the Drawings

[0033] Figure 1 It is a process flow chart of the tobacco leaf temperature and humidity increase of the embodiment of the present invention;

[0034] Figure 2 It is a working principle diagram of the loose conditioning machine of the embodiment of the present invention;

[0035] Figure 3 It is a process control chart of the loose conditioning machine of the embodiment of the present invention. Detailed Embodiments

[0036] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. However, the implementation manners of the present invention are not limited thereto.

[0037] Example 1:

[0038] Figure 1 The process flow diagram of increasing the temperature and humidity of tobacco leaves is shown. The tobacco leaves are conveyed into a loose and tempering machine through an electronic belt weigher. After the loose and tempering machine performs temperature and humidity increase treatment on the tobacco leaves, they are conveyed onto a vibrating trough. The vibrating trough vibrates to disperse the clustered tobacco leaves, and then the tobacco leaves fall onto a conveyor belt and are conveyed away. The moisture meter is located above the conveyor belt.

[0039] The electronic belt weigher acts between the loose and tempering waiting material stage and the loose and tempering starting stage, as well as between the loose and tempering production stage and the loose and tempering tail material stage, and is used to judge whether to enter the next stage by monitoring the instantaneous flow rate of tobacco leaves and the continuous passing time (tobacco leaf running time T0 and tobacco leaf cumulative amount L1), continuous passing time (tobacco leaf running time T5 and tobacco leaf cumulative amount L2). The moisture meter acts between the loose and tempering starting stage and the loose and tempering production stage, and is used to detect the actual outlet moisture content of tobacco leaves and the continuous passing time (tobacco leaf running time T4) to judge whether to enter the loose and tempering production stage.

[0040] Figure 2 The working principle diagram of the loose and tempering machine is shown. The loose and tempering machine includes: a heater steam diaphragm valve for adjusting the heater opening degree of the hot air temperature in the heater pipeline; a compensating steam diaphragm valve for adjusting the compensating steam opening degree of the cylinder return air temperature; a front-end water adding diaphragm valve for adjusting the water addition amount at the front end of the cylinder of the loose and tempering machine; a rear-end water adding diaphragm valve for controlling the water addition amount at the rear end of the cylinder of the loose and tempering machine; a cylinder frequency conversion motor for adjusting the cylinder motor frequency and further adjusting the rotation speed of the cylinder (i.e., the drum). Specifically, the loose and tempering machine is a drum-type leaf tempering machine.

[0041] Figure 3 The process control diagram of the loose and tempering machine is shown, where the reference numerals and corresponding names are: is the heater diaphragm valve, is the compensating steam diaphragm valve, is the front-end water adding diaphragm valve, is the rear-end water adding diaphragm valve, is the cylinder frequency conversion motor.

[0042] See Figure 3 , from the tobacco leaves entering the loose and tempering machine to leaving the loose and tempering machine, they need to go through a total of the loose and tempering machine waiting material stage, the loose and tempering machine starting stage, the loose and tempering machine production stage, and the loose and tempering machine tail material stage.

[0043] SeeFigures 1 - 3 , this embodiment discloses a method for shortening the unsteady state time of the moisture content of tobacco leaves at the outlet of a loose leaf re-drying machine. Taking 12% as an example for the sampling reference point of the moisture content of tobacco leaves on the electronic belt scale, the unsteady state time of the moisture content of tobacco leaves at the outlet of the loose leaf re-drying machine refers to: the unsteady state time T1 of the moisture content of tobacco leaves (12% ≤ moisture content of tobacco leaves < lower limit of the process-set outlet moisture) in the headstock stage of the moisture content of tobacco leaves at the outlet of the loose leaf re-drying machine; the unsteady state time T2 of the moisture content of tobacco leaves (moisture content of tobacco leaves < lower limit of the process-set outlet moisture, or moisture content of tobacco leaves > upper limit of the process-set outlet moisture) in the production stage of the moisture content of tobacco leaves at the outlet of the loose leaf re-drying machine; the unsteady state time T3 of the moisture content of tobacco leaves (lower limit of the process-set outlet moisture > moisture content of tobacco leaves ≥ 12%) in the tailstock stage of the moisture content of tobacco leaves at the outlet of the loose leaf re-drying machine, and the total unsteady state time T = T1 + T2 + T3. For example: for a certain brand of tobacco leaves, the process-issued index (i.e., the set value of the outlet moisture) for the moisture content at the outlet of the loose leaf re-drying process is 18.5 ± 1.5. The range of 12 - 17 in the headstock stage belongs to the unsteady state time T1; when the actual moisture content in the production stage < 17, or the actual moisture content > 20 belongs to the unsteady state time T2; the range of 17 - 12 in the tailstock stage belongs to the unsteady state time T3; the total unsteady state time T = T1 + T2 + T3.

[0044] The following details this method, which specifically includes:

[0045] A. In the headstock stage, gradually increase the rotational speed of the cylinder of the loose leaf re-drying machine, and adjust the water addition amounts at the front end and the rear end to shorten the unsteady state time of the moisture content of tobacco leaves at the outlet of the loose leaf re-drying machine when the moisture content of tobacco leaves is in the range of 12% - the set lower limit of the outlet moisture.

[0046] A1. The waiting stage of the loose leaf re-drying machine:

[0047] Specifically, in this stage, mainly preheat the inside of the cylinder of the loose leaf re-drying machine; through the PID automatic adjustment of the hot air heater film valve opening of the loose leaf re-drying machine, control the steam amount of the hot air heater, and adjust the temperature inside the cylinder to the preheating temperature C0;

[0048] Adjust the frequency of the cylinder motor through the cylinder variable frequency motor, and then adjust the rotational speed of the cylinder to the rotational speed of the empty cylinder R1; preferably, the rotational speed of the empty cylinder R1 is 25HZ;

[0049] When the instantaneous flow rate of tobacco leaves on the front electronic belt scale of the loose leaf re-drying machine is greater than 100KG / H and the continuous passing time (tobacco leaf running time T0) is greater than 70 seconds, it enters the starting stage of the loose leaf re-drying machine; it should be noted that the length of the loose leaf re-drying machine is 8m, and it takes 70 seconds for the tobacco leaves to reach the middle of the cylinder from the electronic belt scale.

[0050] A2. The starting stage of the loose leaf re-drying machine:

[0051] By fixing the opening of the hot air heater film valve at 50%, keeping the temperature of the hot air pipeline of the heater constant, and controlling the hot air temperature C1 by adjusting the opening of the compensating steam; it should be noted that fixing the opening of the film valve is to reduce variables, and through single adjustment of the compensating steam, the hot air temperature is more stable.

[0052] Adjust the front-end water addition amount W1 by adjusting the opening of the front-end water addition film valve, and its formula is: W1 = set water addition ratio * 0.7 * actual flow of the electronic belt scale of the conditioning unit.

[0053] Adjust the rear-end water addition amount W2 by adjusting the opening of the rear-end water addition film valve, and its formula is: W2 = set water addition ratio * 0.3 * water addition coefficient / 100 * actual flow of the electronic belt scale of the conditioning unit.

[0054] Adjust the frequency of the cylinder variable-frequency motor to adjust the speed of the cylinder motor, and then adjust the cylinder speed to the starting cylinder speed R2; preferably, gradually increase the cylinder speed R2 according to the cumulative amount of the electronic belt scale. Among them, when the cumulative amount of the electronic belt scale is in the range of 10KG - 100KG, the cylinder speed R2 is 27HZ; in the range of 100KG - 200KG, the cylinder speed R2 is 29HZ; in the range of 200KG - 300KG, the cylinder speed R2 is 31HZ; in the range of 300KG - 350KG, the cylinder speed R2 is 33HZ; it should be noted that in the head stage of the material, there is less material in the cylinder, so the speed is increased slowly to extend the time of the tobacco leaves in the drum and make the discharge of the tobacco leaves uniform.

[0055] When the moisture meter at the outlet of the loose conditioning machine detects that the actual moisture content of the tobacco leaves is greater than the set outlet moisture value minus 2%, and the continuous passing time (tobacco leaf running time T4) is greater than 40 seconds, it enters the production stage of the loose conditioning machine; it should be noted that the above operation is to prevent the moisture of the tobacco leaves from rising sharply and increase the non-steady state time of the process.

[0056] B. In the production stage, humidify the tobacco leaves at a fixed cylinder speed and rear-end water addition amount to stabilize the steady-state time of the moisture content of the tobacco leaves at the outlet of the loose conditioning machine within the set outlet moisture lower limit - set outlet moisture upper limit.

[0057] Adjust the frequency of the cylinder variable-frequency motor to adjust the speed of the cylinder motor, and then adjust the cylinder speed to the production cylinder speed R3; preferably, the production cylinder speed R3 is 33HZ; it should be noted that the production speed R3 is a process-set parameter.

[0058] Adjust the rear-end water addition amount W3 by adjusting the opening of the rear-end water addition film valve, and its formula is: W3 = set water addition ratio * 0.3 / 100 * actual flow of the electronic belt scale of the conditioning unit * (1 + (set moisture - actual outlet moisture)).

[0059] When the instantaneous flow rate of the tobacco leaves on the electronic belt scale in front of the loose re-drying machine is less than 100 KG / H and the continuous passing time (the running time T5 of the tobacco leaves) is greater than 10 seconds, it enters the tail material stage of the loose re-drying machine.

[0060] C. During the tail material stage, increase the rotation speed of the loose re-drying drum, reduce the return air temperature, and gradually reduce the water addition ratio to shorten the unsteady state time of the moisture content of the tobacco leaves at the outlet of the loose re-drying machine between the set outlet moisture lower limit and the sampling reference point.

[0061] Adjust the frequency of the cylinder motor through the cylinder frequency conversion motor, and then adjust the cylinder rotation speed to the production cylinder rotation speed R4; preferably, the production cylinder rotation speed R4 is 45HZ; it should be noted that during the tail material stage, the rotation speed is increased to quickly discharge the tobacco leaves in the cylinder, but if the speed is too fast, the tobacco leaves will be affected by the centrifugal force and the discharge time from the cylinder will be prolonged. After on-site testing, 45HZ is the best.

[0062] By closing the front-end water addition diaphragm valve W4, no more water is added to the tobacco leaves, and thus the water addition amount to the tobacco leaves decreases;

[0063] By closing the compensation steam diaphragm valve, reducing the return air temperature C1, and adjusting the opening degree of the hot air heater diaphragm valve to ensure the water absorption of the tobacco leaves; preferably, the opening degree Kp2 of the hot air heater diaphragm valve is 60%;

[0064] Adjust the back-end water addition amount W5 through the opening degree of the back-end water addition diaphragm valve. Preferably, gradually reduce the back-end water addition amount W5 according to the time of entering the tail material stage. Among them, when 30 seconds after entering the tail material stage, W5 = set water addition ratio * 0.3 / 100 * set flow rate of the electronic belt scale of the re-drying unit * (1 + (set outlet moisture - actual outlet moisture)); when 90 seconds after entering the tail material stage, W5 = set water addition ratio * 0.25 / 100 * set flow rate of the electronic belt scale of the re-drying unit * (1 + (set outlet moisture - actual outlet moisture)); when 150 seconds after entering the tail material stage, W5 = set water addition ratio * 0.2 / 100 * set flow rate of the electronic belt scale of the re-drying unit * (1 + (set outlet moisture - actual outlet moisture)). It should be noted that the tobacco leaves in the tail material stage are gradually decreasing, and the back-end water addition amount gradually reduces the water addition ratio over time to prevent the moisture from surging during the tail material stage and affecting the unsteady state time.

[0065] When the loose re-drying machine enters the tail material stage, by adjusting the rotation speed of the drum, reducing the time of the tail material in the cylinder, and then cooperating with the control of the back-end water addition and the return air temperature, the temperature and humidity of the tobacco leaves are increased.

[0066] By optimizing the control methods in the loose and moistening material waiting stage, starting stage, production stage, and tail material stage, the present invention realizes the adjustment of the water addition amount at the front end and the back end, as well as the adjustment of the cylinder rotation speed. These optimization measures effectively shorten the non-steady state time of the moisture content of the tobacco leaves at the outlet of the loose and moistening process, thereby reducing the non-steady state index. Through these improvements, the production and manufacturing level is enhanced, and the process quality score in the comprehensive evaluation is also increased. After using the method of the present invention and the loose and moistening machine, the non-steady state time of the moisture content of the tobacco leaves at the outlet of the loose and moistening machine is shortened from 216 seconds to 42 seconds, the non-steady state index is reduced from 5.3 to 1.4, and the comprehensive evaluation - process quality score of the non-steady state production and manufacturing level of the loose and moistening process is increased from 0 points to 2.25 points.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for shortening the unsteady state time of the moisture content of tobacco leaves at the outlet of a looser and re-dryer, characterized in that, Including: A. During the head material stage, gradually increase the cylinder rotation speed of the loose tobacco re-drying machine, and adjust the water addition amounts at the front end and the rear end to shorten the non-steady state time T1 of the head material stage. T1 is the non-steady state time when the moisture content of the tobacco leaves is ≥ the sampling reference point and the moisture content of the tobacco leaves < the lower limit of the process-set outlet moisture content; B. During the production stage, humidify the tobacco leaves at a fixed cylinder rotation speed and the water addition amount at the rear end to stabilize the moisture content of the tobacco leaves at the outlet of the loose tobacco re-drying machine. The steady state time of the moisture content of the tobacco leaves in the production stage is within the set outlet moisture content lower limit - the set outlet moisture content upper limit; C. During the tail material stage, increase the rotation speed of the tail material drum of the loose tobacco re-drying machine, reduce the return air temperature, and gradually reduce the water addition ratio to shorten the non-steady state time T3 of the tail material stage. T3 is the non-steady state time when the moisture content of the tobacco leaves is ≥ the sampling reference point and the moisture content of the tobacco leaves < the lower limit of the process-set outlet moisture content. Adjust the cylinder rotation speed to the tail material cylinder rotation speed R4, and the tail material cylinder rotation speed R4 is greater than the production cylinder rotation speed R3.

2. The method for shortening the non-steady state time of the moisture content of tobacco leaves at the outlet of the loose leaf re-dryer according to claim 1, characterized in that Step A specifically includes: A1. Waiting material stage of the loose tobacco re-drying machine: Through the PID automatic adjustment of the film valve opening of the hot air heater, control the steam amount of the hot air heater, and adjust the temperature inside the cylinder to the preheating temperature C0; Adjust the cylinder rotation speed to the empty material cylinder rotation speed R1; When the instantaneous flow rate of the tobacco leaves on the front electronic belt scale of the loose tobacco re-drying machine is greater than the set value and the continuous passing time is greater than the time required for the tobacco leaves to reach the middle of the cylinder from the electronic belt scale, enter the starting stage of the loose tobacco re-drying machine; A2. Starting stage of the loose tobacco re-drying machine: Keep the opening of the film valve of the hot air heater fixed at 50%, maintain the temperature of the hot air pipeline of the heater constant, and control the hot air temperature C1 by adjusting the opening of the compensating steam; Adjust the cylinder rotation speed to the starting cylinder rotation speed R2, and gradually increase the cylinder rotation speed R2 according to the cumulative amount of the electronic belt scale; Adjust the water addition amount W1 at the front end and the water addition amount W2 at the rear end; When the actual moisture content of the tobacco leaves detected by the moisture meter at the outlet of the loose tobacco re-drying machine is greater than the set outlet moisture content value by 2% and the continuous passing time is greater than the set value, enter the production stage of the loose tobacco re-drying machine.

3. The method for shortening the non-steady state time of the moisture content of tobacco leaves at the outlet of the softening drum according to claim 2, wherein, Step B specifically includes: Adjust the cylinder rotation speed to the production cylinder rotation speed R3, adjust the water addition amount W3 at the rear end, and humidify the tobacco leaves at a fixed production cylinder rotation speed R3 and the water addition amount W3 at the rear end; When the instantaneous flow rate of the tobacco leaves on the electronic belt scale in front of the loose tobacco re-drying machine is less than the set value and the continuous passing time is greater than the set value, enter the tail material stage of the loose tobacco re-drying machine.

4. The method for shortening the unsteady state time of the moisture content of the tobacco leaves at the outlet of the loose leaf re-dryer according to claim 3, characterized in that, Step C specifically includes: Adjust the opening of the film valve of the hot air heater Kp2 to 60%; Close the water addition amount W4 at the front end; adjust the water addition amount W5 at the rear end, and the water addition amount W5 at the rear end gradually reduces the water addition ratio over time; Close the opening of the compensating steam to reduce the return air temperature C1; When the loose tobacco re-drying machine enters the tail material stage, by adjusting the rotation speed of the drum, reduce the time of the tail material in the cylinder, and then cooperate with the water addition at the rear end and the control of the hot air temperature to perform temperature and humidity increase on the tobacco leaves.

5. The method for shortening the non-steady state time of the moisture content of the tobacco leaves at the outlet of the looser re-dryer according to claim 4, characterized in that, Apply different water addition amount controls in different stages: In the starting stage, the water addition amount W1 at the front end = the set water addition ratio * 0.7 * the actual flow rate of the electronic belt scale of the re-drying unit; the water addition amount W2 at the rear end = the set water addition ratio * 0.3 * 0.175 / 100 * the actual flow rate of the electronic belt scale of the re-drying unit; During the production stage, the water addition amount at the back end W3 = set water addition ratio * 0.3 / 100 * actual flow of the electronic belt scale in the conditioning unit * (1 + (set outlet moisture content - actual outlet moisture content)); During the tailings stage, the water addition amount at the front end W4 = 0, and the water addition amount at the back end W5 gradually decreases with the time entering the tailings stage; specifically, after 30 seconds of entering the tailings stage, W5 = set water addition ratio * 0.3 / 100 * set flow of the electronic belt scale in the conditioning unit * (1 + (set outlet moisture content - actual outlet moisture content)); after 90 seconds of entering the tailings stage, W5 = set water addition ratio * 0.25 / 100 * set flow of the electronic belt scale in the conditioning unit * (1 + (set outlet moisture content - actual outlet moisture content)); after 150 seconds of entering the tailings stage, W5 = set water addition ratio * 0.2 / 100 * set flow of the electronic belt scale in the conditioning unit * (1 + (set outlet moisture content - actual outlet moisture content)).

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