An adaptive tuning method for tobacco curing

Abstract

The present application relates to a kind of self-adapting tobacco curing method, belong to tobacco curing technical field.The self-adapting tobacco curing method of the present application, by collecting the real-time image of tobacco in curing process, establishes the state change grade image data set of target tobacco, then detects the state of target tobacco in the process of flue-cured tobacco, and the image obtained by detection is compared with change grade image data set, then determine the state change grade of target tobacco in curing process, according to the state change grade of target tobacco, determine the start of each stage heating treatment in multi-stage heating treatment, the dry bulb temperature, wet bulb temperature and time used in each stage heating treatment, to realize the automation, intelligent tuning of key process indicators of curing, to save manpower and improve curing effect.

Description

TECHNICAL FIELD

[0001] The present application relates to a self-adaptive tuning tobacco curing method, belonging to the technical field of tobacco curing. BACKGROUND

[0002] Curing is a key link to determine the quality and economic benefits of tobacco leaves, and is closely related to commercial tobacco production and industrial tobacco. Since the 1990s, China's tobacco curing equipment has made great progress. With the gradual upgrading of earth oven, standard dense coal / biomass curing room and air source heat pump curing room, more precise control of the environment temperature and humidity during the curing process has been achieved. The curing process has gradually evolved from three-stage to multi-stage and multi-point process, achieving more fine regulation and control of the environment temperature and humidity during the curing process. In recent years, the research on intelligent tobacco curing technology has made significant progress, and a number of more usable data collection equipment for curing have emerged. Machine vision and artificial intelligence technology provide important technical means for intelligent recognition and accurate judgment of tobacco state. Meanwhile, big data analysis technology lays a foundation for deep mining of data and establishment of algorithm model. The upgrading of clean energy curing room provides a basic platform for intelligent and accurate control of the curing process. By using modern information technology to automatically acquire and analyze the data of the tobacco curing process and through the establishment of algorithm model to accurately implement the curing process technology for tobacco in different areas, important support can be provided for promoting the transformation and modernization of tobacco production methods and the development of intelligent tobacco agriculture. Therefore, the research and application of intelligent tobacco curing system with the core of automatic collection of curing room data, autonomous analysis of tobacco state and self-adaptive tuning of curing process have been rapidly developed.

[0003] Chinese patent document CN116784504A discloses a tobacco intelligent curing system and method based on Internet of Things, which mainly solves the problem of remote control of curing room temperature and humidity. Chinese patent document CN116434045A discloses a method for intelligent identification of tobacco curing stage, which mainly establishes an intelligent identification model for the tobacco curing stage. Chinese patent document CN114931230A discloses a method for analyzing and characterizing process execution indicators in the tobacco curing process, which mainly realizes automatic analysis of temperature and humidity data in the curing process based on Internet of Things. In summary, there are many researches on the collection and analysis of curing process data and the construction of algorithm model, but there is no relevant literature reported on the self-adaptive tuning of the curing process.

[0004] Therefore, there is an urgent need to provide a tobacco curing method that can be self-adaptively tuned to improve the effect of tobacco curing. SUMMARY

[0005] The present application aims to provide a self-adaptive tuning tobacco curing method, which can solve the problem that the current tobacco curing method cannot realize self-adaptive tuning.

[0006] In order to achieve the above object, the technical scheme of the adaptive tuning tobacco curing method is as follows:

[0007] The adaptive tuning tobacco curing method comprises the following steps: first, acquiring state images corresponding to different curing stages of target tobacco, establishing a state change level image data set of the target tobacco, and then curing the target tobacco; the curing comprises sequentially performing preheating treatment, multi-stage temperature rising heat treatment and final heat treatment on the target tobacco; the dry bulb temperature of the preheating treatment is 35-38.5℃, and the wet bulb temperature is 33-37.5℃; the dry bulb temperature of the final heat treatment is 67-69℃, and the wet bulb temperature is 40-42℃; the multi-stage temperature rising heat treatment comprises n temperature rising heating stages performed in sequence, the start of each stage of heating treatment, the dry bulb temperature, the wet bulb temperature and the time of each stage of heating treatment are determined by the state change level of the target tobacco in the curing process, and n is an integer not less than 6; the state change level of the target tobacco is one or any combination of a yellowing degree level, a drying degree level and a browning degree level, and the state change level of the target tobacco is determined by the following method: during the curing of tobacco, the state of the target tobacco is detected, the detected image is compared with the change level image data set, and then the state change level of the target tobacco is determined.

[0008] The tobacco curing method of the present application realizes automatic and intelligent tuning of key process indicators of the curing by collecting real-time images of tobacco leaves in the curing process, establishing a state change level image data set of the target tobacco, then detecting the state of the target tobacco in the tobacco curing process, comparing the detected image with the change level image data set, then determining the state change level of the target tobacco in the curing process, and then determining the start of each stage of heating treatment in the multi-stage temperature rising heat treatment, the dry bulb temperature, the wet bulb temperature and the time of each stage of heating treatment according to the state change level of the target tobacco, thereby saving labor and improving the curing effect.

[0009] Preferably, the comparison of the detected image with the change level image data set and the determination of the state change level of the target tobacco are performed by an artificial intelligence method.

[0010] Preferably, the pre-heating treatment comprises a first stage pre-heating and a second stage pre-heating, the first stage pre-heating has a dry-bulb temperature of 35-38℃ and a wet-bulb temperature of 33-37.5℃, the first stage pre-heating lasts for 6-10 hours, the temperature is raised from room temperature to the dry-bulb temperature of the first stage pre-heating at a rate of 0.8-1.2℃ / h, the second stage pre-heating has a dry-bulb temperature of 37.5-38.5℃ and a wet-bulb temperature of 35-36.5℃, the second stage pre-heating lasts for no less than 8 hours, the temperature is raised from the dry-bulb temperature of the first stage pre-heating to the dry-bulb temperature of the second stage pre-heating at a rate of 4-6℃ / h; the final stage heat treatment lasts for no less than 16 hours.

[0011] Preferably, the start of each stage of heating treatment, the dry-bulb temperature used in each stage of heating treatment, and the time of each stage of heating treatment are determined by the yellowing degree grade, and the wet-bulb temperature used in each stage of heating treatment is determined by the drying degree grade and / or the browning degree grade.

[0012] Preferably, the yellowing degree grade comprises A, B, C, D, E, F, and G, the drying degree grade comprises a, b, c, d, e, f, g, h, and i, and the browning degree grade comprises I, II, III, IV, V, and VI.

[0013] A refers to 5-6% of the tobacco leaves being yellow, B refers to 7-8% of the tobacco leaves being yellow, C refers to the yellow leaves having green veins at the base, D refers to the yellow leaves having green veins, E refers to the yellow leaves having white veins, F refers to the main veins of the tobacco leaves being partially contracted and purple, and G refers to the main veins of the tobacco leaves being completely purple.

[0014] a refers to the tobacco leaves being swollen and hard, b refers to the tips of the tobacco leaves being soft, c refers to the tobacco leaves being soft, d refers to the tobacco leaves being collapsed, e refers to the tips of the tobacco leaves being hooked and curled, f refers to 1 / 2-2 / 3 of the tobacco leaves being dry, g refers to the tobacco leaves being completely dry, h refers to the main veins of the tobacco leaves being 45-55% dry, and i refers to the main veins of the tobacco leaves being completely dry.

[0015] I refers to the area of the brown part of the tobacco leaves being 0, II refers to the area percentage of the brown part of the tobacco leaves being greater than 0 and no more than 10%, III refers to the area percentage of the brown part of the tobacco leaves being greater than 10% and no more than 20%, IV refers to the area percentage of the brown part of the tobacco leaves being greater than 20% and no more than 30%, V refers to the area percentage of the brown part of the tobacco leaves being greater than 30% and no more than 50%, and VI refers to the area percentage of the brown part of the tobacco leaves being greater than 50%.

[0016] Preferably, the multi-stage temperature rising heat treatment includes a first stage heating treatment, a second stage heating treatment, a third stage heating treatment, a fourth stage heating treatment, a fifth stage heating treatment and a sixth stage heating treatment performed in sequence.

[0017] Preferably, when the time of the pre-heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is at the B level, the first stage heating treatment is started;

[0018] When the time of the first stage heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is at the C level, the second stage heating treatment is started;

[0019] When the time of the second stage heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is at the D level, the third stage heating treatment is started;

[0020] When the time of the third stage heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is at the E level, the fourth stage heating treatment is started;

[0021] When the time of the fourth stage heating treatment reaches a predetermined value and the yellowing degree of not less than 51% and less than 70% of the tobacco leaves is at the F level, the fifth stage heating treatment is started;

[0022] When the time of the fifth stage heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is at the F level, the sixth stage heating treatment is started.

[0023] Preferably, the predetermined value of the time of the pre-heating treatment is not less than 14h, the predetermined value of the time of the first stage heating treatment is not less than 8h, the predetermined value of the time of the second stage heating treatment is not less than 12h, the predetermined value of the time of the third stage heating treatment is not less than 8h, the predetermined value of the time of the fourth stage heating treatment is not less than 8h, the predetermined value of the time of the fifth stage heating treatment is not less than 12h, and the time of the sixth stage heating treatment is 5-7h.

[0024] Preferably, the dry-bulb temperature of the first stage heating treatment is 39-41℃, the dry-bulb temperature of the second stage heating treatment is 41.5-43℃, the dry-bulb temperature of the third stage heating treatment is 44-46℃, the dry-bulb temperature of the fourth stage heating treatment is 47-49℃, the dry-bulb temperature of the fifth stage heating treatment is 53-55℃, and the dry-bulb temperature of the sixth stage heating treatment is 59-61℃.

[0025] Preferably, the wet bulb temperature of the first stage heating treatment is determined according to the following principle: when the time of the pre-heating treatment reaches a predetermined value and the yellowing degree grade of the tobacco leaves of the number of 70% or more is B grade, if the drying degree grade of the tobacco leaves is a grade or b grade, the wet bulb temperature of the first stage heating treatment is 34-37°C, if the drying degree grade of the tobacco leaves is c grade, the wet bulb temperature of the first stage heating treatment is 35-37.5°C, and if the drying degree grade of the tobacco leaves is d grade, e grade, f grade, g grade, h grade or i grade, the wet bulb temperature of the first stage heating treatment is 36-38°C.

[0026] Preferably, the wet bulb temperature of the second stage heating treatment is determined according to the following principle: when the time of the first stage heating treatment reaches a predetermined value and the yellowing degree grade of the tobacco leaves of the number of 70% or more is C grade, if the drying degree grade of the tobacco leaves is a grade, b grade or c grade and the browning degree grade of the tobacco leaves is I grade, the wet bulb temperature of the second stage heating treatment is 35-36.5°C, if the drying degree grade of the tobacco leaves is a grade, b grade or c grade and the browning degree grade of the tobacco leaves is II grade, III grade, IV grade, V grade or VI grade, the wet bulb temperature of the second stage heating treatment is 34-36°C; if the drying degree grade of the tobacco leaves is d grade and the browning degree grade of the tobacco leaves is I grade, the wet bulb temperature of the second stage heating treatment is 36-37.5°C, if the drying degree grade of the tobacco leaves is d grade and the browning degree grade of the tobacco leaves is II grade, III grade, IV grade, V grade or VI grade, the wet bulb temperature of the second stage heating treatment is 35-37°C; if the drying degree grade of the tobacco leaves is e grade, f grade, g grade, h grade or i grade and the browning degree grade of the tobacco leaves is I grade, the wet bulb temperature of the second stage heating treatment is 36.5-38°C, and if the drying degree grade of the tobacco leaves is e grade, f grade, g grade, h grade or i grade and the browning degree grade of the tobacco leaves is II grade, III grade, IV grade, V grade or VI grade, the wet bulb temperature of the second stage heating treatment is 36-37.5°C.

[0027] Preferably, the wet bulb temperature of the third stage heating treatment is determined according to the following principles: when the time of the second stage heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is grade D, if the drying degree of the tobacco leaves is grade a, b, c or d and the browning degree of the tobacco leaves is grade I, the wet bulb temperature of the third stage heating treatment is 35-37°C, if the drying degree of the tobacco leaves is grade a, b, c or d and the browning degree of the tobacco leaves is grade II, III, IV, V or VI, the wet bulb temperature of the third stage heating treatment is 34-36°C; if the drying degree of the tobacco leaves is grade e and the browning degree of the tobacco leaves is grade I, the wet bulb temperature of the third stage heating treatment is 36-38°C, if the drying degree of the tobacco leaves is grade e and the browning degree of the tobacco leaves is grade II, III, IV, V or VI, the wet bulb temperature of the third stage heating treatment is 35-37°C; if the drying degree of the tobacco leaves is grade f, g, h or i and the browning degree of the tobacco leaves is grade I, the wet bulb temperature of the third stage heating treatment is 37-38°C, if the drying degree of the tobacco leaves is grade f, g, h or i and the browning degree of the tobacco leaves is grade II, III, IV, V or VI, the wet bulb temperature of the third stage heating treatment is 36-37.5°C.

[0028] Preferably, the wet bulb temperature of the fourth stage heating treatment is determined according to the following principles: when the time of the third stage heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is grade E, if the drying degree of the tobacco leaves is grade a, b, c or d and the browning degree of the tobacco leaves is grade I, the wet bulb temperature of the fourth stage heating treatment is 36-37°C, if the drying degree of the tobacco leaves is grade a, b, c or d and the browning degree of the tobacco leaves is grade II, III, IV, V or VI, the wet bulb temperature of the fourth stage heating treatment is 35-36°C; if the drying degree of the tobacco leaves is grade e, f, g, h or i and the browning degree of the tobacco leaves is grade I, the wet bulb temperature of the fourth stage heating treatment is 37-38°C, if the drying degree of the tobacco leaves is grade e, f, g, h or i and the browning degree of the tobacco leaves is grade II, III, IV, V or VI, the wet bulb temperature of the fourth stage heating treatment is 36-37°C.

[0029] Preferably, the wet bulb temperature of the fifth stage heating treatment is determined according to the following principle: when the time of the fourth stage heating treatment reaches a predetermined value and the yellowing degree of not less than 51% and less than 70% of the tobacco leaves is F grade, if the drying degree of the tobacco leaves is a grade, b grade, c grade, d grade or e grade and the browning degree of the tobacco leaves is I grade, the wet bulb temperature of the fifth stage heating treatment is 37-38℃, if the drying degree of the tobacco leaves is a grade, b grade, c grade, d grade or e grade and the browning degree of the tobacco leaves is II grade, III grade, IV grade, V grade or VI grade, the wet bulb temperature of the fifth stage heating treatment is 36-37℃; if the drying degree of the tobacco leaves is f grade, g grade, h grade or i grade and the browning degree of the tobacco leaves is I grade, the wet bulb temperature of the fifth stage heating treatment is 38-39℃, if the drying degree of the tobacco leaves is f grade, g grade, h grade or i grade and the browning degree of the tobacco leaves is II grade, III grade, IV grade, V grade or VI grade, the wet bulb temperature of the fifth stage heating treatment is 37-38℃.

[0030] Preferably, the wet bulb temperature of the sixth stage heating treatment is determined according to the following principle: when the time of the fifth stage heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is F grade, if the drying degree of the tobacco leaves is a grade, b grade, c grade, d grade, e grade or f grade, the wet bulb temperature of the sixth stage heating treatment is 38-39℃, if the drying degree of the tobacco leaves is g grade, h grade or i grade, the wet bulb temperature of the sixth stage heating treatment is 39-40℃.

[0031] Preferably, the tobacco leaves are from Henan Province, the pre-heating treatment comprises a first stage pre-heating and a second stage pre-heating performed in sequence, the dry bulb temperature of the first stage pre-heating is 36℃, the wet bulb temperature of the first stage pre-heating is 35℃, the time of the first stage pre-heating is 6h, the temperature rising rate from room temperature to the dry bulb temperature of the first stage pre-heating is 1℃ / h, the dry bulb temperature of the second stage pre-heating is 38℃, the wet bulb temperature of the second stage pre-heating is 36.5℃, the time of the second stage pre-heating is not less than 12h, and the time from the dry bulb temperature of the first stage pre-heating to the dry bulb temperature of the second stage pre-heating is 4h; the multi-stage heating treatment comprises a first stage heating treatment, a second stage heating treatment, a third stage heating treatment, a fourth stage heating treatment, a fifth stage heating treatment and a sixth stage heating treatment performed in sequence; the dry bulb temperature of the final stage heating treatment is 68℃, the wet bulb temperature of the final stage heating treatment is 41℃, and the time of the final stage heating treatment is not less than 16h; the time from the dry bulb temperature of the sixth stage heating treatment to the dry bulb temperature of the final stage heating treatment is 8h.

[0032] When the time of the second stage pre-heating is 12h, the state of the target tobacco leaves is detected, and when the yellowing degree of more than 70% of the number of the tobacco leaves is B level, the first stage heating treatment is started, the dry-bulb temperature of the first stage heating treatment is 40℃, the time for increasing the dry-bulb temperature from the dry-bulb temperature of the second stage pre-heating to the dry-bulb temperature of the first stage heating treatment is 4h, and the time of the first stage heating treatment is not less than 12h; when the yellowing degree of more than 70% of the number of the tobacco leaves is B level, if the drying degree of the tobacco leaves is a level or b level, the wet-bulb temperature of the first stage heating treatment is 36℃, if the drying degree of the tobacco leaves is c level, the wet-bulb temperature of the first stage heating treatment is 36.5℃, and if the drying degree of the tobacco leaves is d level, e level, f level, g level, h level or i level, the wet-bulb temperature of the first stage heating treatment is 37℃;

[0033] When the time of the first stage heating treatment is 12h, the state of the target tobacco leaves is detected, and when the yellowing degree of more than 70% of the number of the tobacco leaves is C level, the second stage heating treatment is started, the dry-bulb temperature of the second stage heating treatment is 42℃, the time for increasing the dry-bulb temperature from the dry-bulb temperature of the first stage heating treatment to the dry-bulb temperature of the second stage heating treatment is 4h, and the time of the second stage heating treatment is not less than 12h; when the yellowing degree of more than 70% of the number of the tobacco leaves is C level, if the drying degree of the tobacco leaves is a level, b level or c level, and the browning degree of the tobacco leaves is I level, the wet-bulb temperature of the second stage heating treatment is 36℃, if the drying degree of the tobacco leaves is a level, b level or c level, and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet-bulb temperature of the second stage heating treatment is 35℃; when the yellowing degree of more than 70% of the number of the tobacco leaves is C level, if the drying degree of the tobacco leaves is d level, and the browning degree of the tobacco leaves is I level, the wet-bulb temperature of the second stage heating treatment is 37℃, if the drying degree of the tobacco leaves is d level, and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet-bulb temperature of the second stage heating treatment is 36℃; when the yellowing degree of more than 70% of the number of the tobacco leaves is C level, if the drying degree of the tobacco leaves is e level, f level, g level, h level or i level, and the browning degree of the tobacco leaves is I level, the wet-bulb temperature of the second stage heating treatment is 37℃, if the drying degree of the tobacco leaves is e level, f level, g level, h level or i level, and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet-bulb temperature of the second stage heating treatment is 36.5℃;

[0034] When the number of tobacco leaves of which the yellowing degree is D level is more than 70%, the third stage heating treatment is started, the dry-bulb temperature of the third stage heating treatment is 45°C, the time for increasing the dry-bulb temperature from the dry-bulb temperature of the second stage heating treatment to the dry-bulb temperature of the third stage heating treatment is 6h, and the time of the third stage heating treatment is not less than 12h; when the number of tobacco leaves of which the yellowing degree is D level is more than 70%, if the drying degree of the tobacco leaves is a level, b level, c level or d level, and the browning degree of the tobacco leaves is I level, the wet-bulb temperature of the third stage heating treatment is 35.5°C, if the drying degree of the tobacco leaves is a level, b level, c level or d level, and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet-bulb temperature of the third stage heating treatment is 35°C; when the number of tobacco leaves of which the yellowing degree is D level is more than 70%, if the drying degree of the tobacco leaves is e level, and the browning degree of the tobacco leaves is I level, the wet-bulb temperature of the third stage heating treatment is 36.5°C, if the drying degree of the tobacco leaves is e level, and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet-bulb temperature of the third stage heating treatment is 36°C; when the number of tobacco leaves of which the yellowing degree is D level is more than 70%, if the drying degree of the tobacco leaves is f level, g level, h level or i level, and the browning degree of the tobacco leaves is I level, the wet-bulb temperature of the third stage heating treatment is 37°C, if the drying degree of the tobacco leaves is f level, g level, h level or i level, and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet-bulb temperature of the third stage heating treatment is 36.5°C;

[0035] When the time of the third stage heating treatment is 12h, the state of the target tobacco leaves is detected, and when the yellowing degree of more than 70% of the tobacco leaves is E level, the fourth stage heating treatment is started, the dry ball temperature of the fourth stage heating treatment is 48℃, the time for increasing the dry ball temperature from the dry ball temperature of the third stage heating treatment to the dry ball temperature of the fourth stage heating treatment is 6h, and the time of the fourth stage heating treatment is not less than 12h; when the yellowing degree of more than 70% of the tobacco leaves is E level, if the drying degree of the tobacco leaves is a, b, c or d level, and the browning degree of the tobacco leaves is I level, the wet ball temperature of the fourth stage heating treatment is 37℃, if the drying degree of the tobacco leaves is a, b, c or d level, and the browning degree of the tobacco leaves is II, III, IV, V or VI level, the wet ball temperature of the fourth stage heating treatment is 36℃; when the yellowing degree of more than 70% of the tobacco leaves is E level, if the drying degree of the tobacco leaves is e, f, g, h or i level, and the browning degree of the tobacco leaves is I level, the wet ball temperature of the fourth stage heating treatment is 38℃, if the drying degree of the tobacco leaves is e, f, g, h or i level, and the browning degree of the tobacco leaves is II, III, IV, V or VI level, the wet ball temperature of the fourth stage heating treatment is 37℃;

[0036] When the time of the fourth stage heating treatment is 12h, the state of the target tobacco leaves is detected, and when the yellowing degree of not less than 51% and less than 70% of the tobacco leaves is F level, the fifth stage heating treatment is started, the dry ball temperature of the fifth stage heating treatment is 54℃, the time for increasing the dry ball temperature from the dry ball temperature of the fourth stage heating treatment to the dry ball temperature of the fifth stage heating treatment is 10h, and the time of the fifth stage heating treatment is not less than 12h; when the yellowing degree of not less than 51% and less than 70% of the tobacco leaves is F level, if the drying degree of the tobacco leaves is a, b, c, d or e level, and the browning degree of the tobacco leaves is I level, the wet ball temperature of the fifth stage heating treatment is 37.5℃, if the drying degree of the tobacco leaves is a, b, c, d or e level, and the browning degree of the tobacco leaves is II, III, IV, V or VI level, the wet ball temperature of the fifth stage heating treatment is 36.5℃; when the yellowing degree of not less than 51% and less than 70% of the tobacco leaves is F level, if the drying degree of the tobacco leaves is f, g, h or i level, and the browning degree of the tobacco leaves is I level, the wet ball temperature of the fifth stage heating treatment is 38.5℃, if the drying degree of the tobacco leaves is f, g, h or i level, and the browning degree of the tobacco leaves is II, III, IV, V or VI level, the wet ball temperature of the fifth stage heating treatment is 37.5℃;

[0037] When the time of the fifth stage heating treatment is 12h, the state of the target tobacco leaf is detected, and when the yellowing degree of more than 70% of the tobacco leaves is F level, the sixth stage heating treatment is started, the dry ball temperature of the sixth stage heating treatment is 60 DEG C, the time for increasing the dry ball temperature from the dry ball temperature of the fifth stage heating treatment to the dry ball temperature of the sixth stage heating treatment is 6h, and the time of the sixth stage heating treatment is 6h; when the yellowing degree of more than 70% of the tobacco leaves is F level, if the drying degree of the tobacco leaves is a, b, c, d, e or f level, the wet ball temperature of the sixth stage heating treatment is 38 DEG C, and if the drying degree of the tobacco leaves is g, h or i level, the wet ball temperature of the sixth stage heating treatment is 39 DEG C. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 A flowchart of the adaptive and optimized tobacco leaf curing method of the present application;

[0039] Figure 2 A schematic diagram of the image acquisition device used in Example 1 of the present application;

[0040] Figure 3 Tobacco leaf images at different stages in the curing process in Example 1 of the present application;

[0041] Figure 4 A schematic diagram of the installation position of the image acquisition device in Example 1 of the present application;

[0042] Figure 5 Tobacco leaf images at different stages in the curing process in Example 2 of the present application;

[0043] The reference signs are as follows: 1 - support plate; 2 - ventilation hole; 3 - wiring hole; 4 - connecting rod; 5 - telescopic adjuster; 6 - universal adjusting nut; 7 - camera; 8 - color card suspension hole; 9 - color card. DETAILED DESCRIPTION

[0044] The adaptive and optimized tobacco leaf curing method of the present application is an original and innovative creation, and a flowchart of the adaptive and optimized tobacco leaf curing method of the present application is shown in Figure 1As shown, first, the state images of the target tobacco leaf corresponding to different baking stages are acquired, then the state change level image dataset of the target tobacco leaf in the baking process of different yellowing degrees, drying degrees and browning degrees is formed through expert labeling, then the corresponding recognition algorithm is established according to the state change level image dataset, then the target tobacco leaf is baked, the state change level of the target tobacco leaf in the baking process is recognized, and the temperature and humidity are regulated according to the recognition result: if the yellowing degree reaches the preset requirement, the temperature is stably increased; if the drying degree appears positive deviation, the moisture is reduced, if the drying degree appears negative deviation, the moisture is increased, and if the drying degree reaches the preset requirement, the moisture is stably discharged; if the browning degree level is I level, the moisture is stably discharged, and if the browning degree level is II level, III level, IV level, V level or VI level, the moisture is increased.

[0045] The adaptive optimization tobacco leaf baking method of the application comprises the following steps: the tobacco leaf is subjected to preheating treatment, multi-stage temperature rising heat treatment and final segment heat treatment in sequence; the dry bulb temperature of the preheating treatment is 35-38.5℃, and the wet bulb temperature is 33-37.5℃; the multi-stage temperature rising heat treatment comprises n temperature rising heating stages performed in sequence, the start of each stage of heating treatment and the dry bulb temperature and wet bulb temperature used in each stage of heating treatment are determined by the change level of the state of the tobacco leaf in the baking process, the change level is one or any combination of the yellowing degree level, the drying degree level and the browning degree level, the dry bulb temperature of the multi-stage temperature rising heat treatment is 39-61℃, and the wet bulb temperature is 34-40℃; the dry bulb temperature of the final segment heat treatment is 67-69℃, and the wet bulb temperature is 40-42℃.

[0046] The tobacco leaf baking method of the application collects real-time images of the tobacco leaf in the baking process through an industrial Internet of Things camera, intelligently identifies the yellowing degree, drying degree and browning degree of the tobacco leaf by using an artificial intelligence recognition algorithm, can automatically, intelligently and accurately regulate the key process indicators of baking, does not need to subjectively judge the appearance change (yellowing and drying) of the tobacco leaf by using the human eye, can automatically complete the regulation of the tobacco leaf baking parameters without human intervention, can effectively save labor, and realizes automatic and intelligent regulation.

[0047] The representative real-time image of the baking process of one tobacco leaf uses an artificial intelligence recognition algorithm to intelligently identify the yellowing degree, drying degree and browning degree of the tobacco leaf, proposes an adaptive regulation method for the baking process of different production areas, and differs from the baking method of the prior art which mainly subjectively judges the appearance change (yellowing and drying) of the tobacco leaf by using the human eye, and more focuses on the automatic, intelligent and accurate regulation of the key process indicators of baking. In some preferred embodiments, the n = 6 by the method provided in the application.

[0048] In some preferred embodiments, the yellowing degree grade includes A, B, C, D, E, F, G, the drying degree grade includes a, b, c, d, e, f, g, h, i, and the browning degree grade includes I, II, III, IV, V, VI.

[0049] The A grade refers to that the tobacco leaves reach 5-6 yellow, the B grade refers to that the tobacco leaves reach 7-8 yellow, the C grade refers to that the tobacco leaves reach yellow pieces with green veins at the base, the D grade refers to that the tobacco leaves reach yellow pieces with green veins, the E grade refers to that the tobacco leaves reach yellow pieces with white veins, the F grade refers to that the tobacco leaves reach main vein contraction and purple, and the G grade refers to that the tobacco leaves reach main vein all purple.

[0050] The a grade refers to that the tobacco leaves reach inflation and hardening, the b grade refers to that the tobacco leaves reach leaf tip softening, the c grade refers to that the tobacco leaves reach leaf softening, the d grade refers to that the tobacco leaves reach leaf collapse, the e grade refers to that the tobacco leaves reach leaf hooking and edge curling, the f grade refers to that 1 / 2-2 / 3 of the tobacco leaves reach dry pieces, the g grade refers to that the tobacco leaves reach dry pieces, the h grade refers to that the main vein of the tobacco leaves reaches 45-55% drying degree, and the i grade refers to that the main vein of the tobacco leaves reaches dry.

[0051] The I grade refers to that the area of the brown part in the tobacco leaves is 0, the II grade refers to that the area percentage of the brown part in the tobacco leaves is greater than 0 and not greater than 10%, the III grade refers to that the area percentage of the brown part in the tobacco leaves is greater than 10% and not greater than 20%, the IV grade refers to that the area percentage of the brown part in the tobacco leaves is greater than 20% and not greater than 30%, the V grade refers to that the area percentage of the brown part in the tobacco leaves is greater than 30% and not greater than 50%, and the VI grade refers to that the area percentage of the brown part in the tobacco leaves is greater than 50%.

[0052] In some preferred embodiments, the start of each stage of heating treatment, the dry-bulb temperature used in each stage of heating treatment, and the time of each stage of heating treatment are determined by the yellowing degree grade, and the wet-bulb temperature used in each stage of heating treatment is determined by the drying degree grade and / or the browning degree grade.

[0053] In order to intelligently identify the state of the tobacco leaves in the curing process and improve the convenience of processing, in some preferred embodiments, the state of the tobacco leaves is identified by cooperating an image acquisition device and an artificial intelligence recognition algorithm. In order to more accurately complete the identification, first, the image data set of the state of the tobacco leaves in the curing process is obtained, and then an artificial intelligence recognition algorithm is established according to the image data set of the state of the tobacco leaves to automatically identify the state of the tobacco leaves in the curing process and the grade of the change of the state of the tobacco leaves. The artificial intelligence recognition algorithm in the present application can be a Vision Transformer (ViT), an EffcientNet, a Mobile vit, a YOLO V5, and the like.

[0054] In some preferred embodiments, the pre-heating treatment comprises a first stage pre-heating and a second stage pre-heating performed in sequence, the dry-bulb temperature of the first stage pre-heating is 35-38℃, the wet-bulb temperature is 33-37.5℃, the time of the first stage pre-heating is 6-10h, the heating rate from room temperature to the dry-bulb temperature of the first stage pre-heating is 0.8-1.2℃ / h, the dry-bulb temperature of the second stage pre-heating is 37.5-38.5℃, the wet-bulb temperature is 35-36.5℃, the time of the second stage pre-heating is not less than 8h, the time from the dry-bulb temperature of the first stage pre-heating to the dry-bulb temperature of the second stage pre-heating is 4-6h; the time of the final stage heat treatment is not less than 16h.

[0055] In some preferred embodiments, in order to better match most actual curing production environments, the multi-stage heating treatment comprises a first stage heating treatment, a second stage heating treatment, a third stage heating treatment, a fourth stage heating treatment, a fifth stage heating treatment and a sixth stage heating treatment performed in sequence; the change level of the state of the tobacco leaves during the curing process is identified;

[0056] When the time of the pre-heating treatment reaches a predetermined value and the yellowing level of more than 70% of the tobacco leaves is B level, the first stage heating treatment is started, the dry-bulb temperature of the first stage heating treatment is 39-41℃, the time of the first stage heating treatment is not less than 8h; when the yellowing level of more than 70% of the tobacco leaves is B level, if the drying level of the tobacco leaves is a level or b level, the wet-bulb temperature of the first stage heating treatment is 34-37℃, if the drying level of the tobacco leaves is c level, the wet-bulb temperature of the first stage heating treatment is 35-37.5℃, if the drying level of the tobacco leaves is d level, e level, f level, g level, h level or i level, the wet-bulb temperature of the first stage heating treatment is 36-38℃;

[0057] When the time of the first stage heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is C level, the second stage heating treatment is started, the dry bulb temperature of the second stage heating treatment is 41.5-43°C, and the time of the second stage heating treatment is not less than 12h; when the yellowing degree of more than 70% of the tobacco leaves is C level, if the drying degree of the tobacco leaves is a, b or c level and the browning degree of the tobacco leaves is I level, the wet bulb temperature of the second stage heating treatment is 35-36.5°C, if the drying degree of the tobacco leaves is a, b or c level and the browning degree of the tobacco leaves is II, III, IV, V or VI level, the wet bulb temperature of the second stage heating treatment is 34-36°C; when the yellowing degree of more than 70% of the tobacco leaves is C level, if the drying degree of the tobacco leaves is d level and the browning degree of the tobacco leaves is I level, the wet bulb temperature of the second stage heating treatment is 36-37.5°C, if the drying degree of the tobacco leaves is d level and the browning degree of the tobacco leaves is II, III, IV, V or VI level, the wet bulb temperature of the second stage heating treatment is 35-37°C; when the yellowing degree of more than 70% of the tobacco leaves is C level, if the drying degree of the tobacco leaves is e, f, g, h or i level and the browning degree of the tobacco leaves is I level, the wet bulb temperature of the second stage heating treatment is 36.5-38°C, if the drying degree of the tobacco leaves is e, f, g, h or i level and the browning degree of the tobacco leaves is II, III, IV, V or VI level, the wet bulb temperature of the second stage heating treatment is 36-37.5°C;

[0058] When the time of the third stage heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is E level, the fourth stage heating treatment is started, the dry ball temperature of the fourth stage heating treatment is 47-49°C, and the time of the fourth stage heating treatment is not less than 8h; when the yellowing degree of more than 70% of the tobacco leaves is E level, if the drying degree of the tobacco leaves is a level, b level, c level or d level, and the browning degree of the tobacco leaves is I level, the wet ball temperature of the fourth stage heating treatment is 36-37°C, if the drying degree of the tobacco leaves is a level, b level, c level or d level, and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet ball temperature of the fourth stage heating treatment is 35-36°C; when the yellowing degree of more than 70% of the tobacco leaves is E level, if the drying degree of the tobacco leaves is e level, f level, g level, h level or i level, and the browning degree of the tobacco leaves is I level, the wet ball temperature of the fourth stage heating treatment is 37-38°C, if the drying degree of the tobacco leaves is e level, f level, g level, h level or i level, and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet ball temperature of the fourth stage heating treatment is 36-37°C;

[0059] When the time of the third stage heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is E level, the fourth stage heating treatment is started, the dry ball temperature of the fourth stage heating treatment is 47-49°C, and the time of the fourth stage heating treatment is not less than 8h; when the yellowing degree of more than 70% of the tobacco leaves is E level, if the drying degree of the tobacco leaves is a level, b level, c level or d level, and the browning degree of the tobacco leaves is I level, the wet ball temperature of the fourth stage heating treatment is 36-37°C, if the drying degree of the tobacco leaves is a level, b level, c level or d level, and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet ball temperature of the fourth stage heating treatment is 35-36°C; when the yellowing degree of more than 70% of the tobacco leaves is E level, if the drying degree of the tobacco leaves is e level, f level, g level, h level or i level, and the browning degree of the tobacco leaves is I level, the wet ball temperature of the fourth stage heating treatment is 37-38°C, if the drying degree of the tobacco leaves is e level, f level, g level, h level or i level, and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet ball temperature of the fourth stage heating treatment is 36-37°C;

[0060] When the time of the fourth stage heating treatment reaches a predetermined value and the yellowing degree of not less than 51% and less than 70% of the tobacco leaves is F level, the fifth stage heating treatment is started, the dry ball temperature of the fifth stage heating treatment is 53-55°C, and the time of the fifth stage heating treatment is not less than 12 h; when the yellowing degree of not less than 51% and less than 70% of the tobacco leaves is F level, if the drying degree of the tobacco leaves is a, b, c, d or e level and the browning degree of the tobacco leaves is I level, the wet ball temperature of the fifth stage heating treatment is 37-38°C, if the drying degree of the tobacco leaves is a, b, c, d or e level and the browning degree of the tobacco leaves is II, III, IV, V or VI level, the wet ball temperature of the fifth stage heating treatment is 36-37°C; when the yellowing degree of not less than 51% and less than 70% of the tobacco leaves is F level, if the drying degree of the tobacco leaves is f, g, h or i level and the browning degree of the tobacco leaves is I level, the wet ball temperature of the fifth stage heating treatment is 38-39°C, if the drying degree of the tobacco leaves is f, g, h or i level and the browning degree of the tobacco leaves is II, III, IV, V or VI level, the wet ball temperature of the fifth stage heating treatment is 37-38°C;

[0061] When the time of the fifth stage heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is F level, the sixth stage heating treatment is started, the dry ball temperature of the sixth stage heating treatment is 59-61°C, and the time of the sixth stage heating treatment is 6 h; when the yellowing degree of more than 70% of the tobacco leaves is F level, if the drying degree of the tobacco leaves is a, b, c, d, e or f level, the wet ball temperature of the sixth stage heating treatment is 38-39°C, if the drying degree of the tobacco leaves is g, h or i level, the wet ball temperature of the sixth stage heating treatment is 39-40°C;

[0062] The predetermined value of the time of the pre-heating treatment is not less than 14 h, the predetermined value of the time of the first stage heating treatment is not less than 8 h, the predetermined value of the time of the second stage heating treatment is not less than 12 h, the predetermined value of the time of the third stage heating treatment is not less than 8 h, the predetermined value of the time of the fourth stage heating treatment is not less than 8 h, the predetermined value of the time of the fifth stage heating treatment is not less than 12 h, and the time of the sixth stage heating treatment is 5-7 h.

[0063] In some preferred embodiments, the time of the final stage heating treatment is not less than 16 h.

[0064] In some preferred embodiments, the time for the dry ball temperature to rise from the dry ball temperature of the sixth stage heating treatment to the dry ball temperature of the final stage heating treatment is 7.5-8.5 h.

[0065] In some preferred embodiments, the tobacco leaves are from Henan Province, the pre-heating treatment comprises a first-stage pre-heating and a second-stage pre-heating performed in sequence, the dry-bulb temperature of the first-stage pre-heating is 36℃, the wet-bulb temperature is 35℃, the time of the first-stage pre-heating is 6h, the heating rate from room temperature to the dry-bulb temperature of the first-stage pre-heating is 1℃ / h, the dry-bulb temperature of the second-stage pre-heating is 38℃, the wet-bulb temperature is 36.5℃, the time of the second-stage pre-heating is not less than 12h, the time from the dry-bulb temperature of the first-stage pre-heating to the dry-bulb temperature of the second-stage pre-heating is 4h; the multi-stage heating treatment comprises a first-stage heating treatment, a second-stage heating treatment, a third-stage heating treatment, a fourth-stage heating treatment, a fifth-stage heating treatment and a sixth-stage heating treatment performed in sequence; the dry-bulb temperature of the final-stage heating treatment is 68℃, the wet-bulb temperature is 41℃, the time of the final-stage heating treatment is not less than 16h; the time from the dry-bulb temperature of the sixth-stage heating treatment to the dry-bulb temperature of the final-stage heating treatment is 8h;

[0066] When the time of the second-stage pre-heating is 12h, the change level of the tobacco leaves during the curing process is identified, and when the yellowing level of more than 70% of the tobacco leaves is B level, the first-stage heating treatment is started, the dry-bulb temperature of the first-stage heating treatment is 40℃, the time from the dry-bulb temperature of the second-stage pre-heating to the dry-bulb temperature of the first-stage heating treatment is 4h, and the time of the first-stage heating treatment is not less than 12h; when the yellowing level of more than 70% of the tobacco leaves is B level, if the drying level of the tobacco leaves is a level or b level, the wet-bulb temperature of the first-stage heating treatment is 36℃, if the drying level of the tobacco leaves is c level, the wet-bulb temperature of the first-stage heating treatment is 36.5℃, and if the drying level of the tobacco leaves is d level, e level, f level, g level, h level or i level, the wet-bulb temperature of the first-stage heating treatment is 37℃;

[0067] When the time of the first-stage heating treatment is 12 h, the change level of the tobacco leaf state in the curing process is identified, and when the yellowing level of more than 70% of the tobacco leaves is C, the second-stage heating treatment is started, the dry-bulb temperature of the second-stage heating treatment is 42°C, the time for increasing the dry-bulb temperature from the dry-bulb temperature of the first-stage heating treatment to the dry-bulb temperature of the second-stage heating treatment is 4 h, and the time of the second-stage heating treatment is not less than 12 h; when the yellowing level of more than 70% of the tobacco leaves is C, if the drying level of the tobacco leaves is a, b or c, and the browning level of the tobacco leaves is I, the wet-bulb temperature of the second-stage heating treatment is 36°C, and if the drying level of the tobacco leaves is a, b or c, and the browning level of the tobacco leaves is II, III, IV, V or VI, the wet-bulb temperature of the second-stage heating treatment is 35°C; when the yellowing level of more than 70% of the tobacco leaves is C, if the drying level of the tobacco leaves is d, and the browning level of the tobacco leaves is I, the wet-bulb temperature of the second-stage heating treatment is 37°C, and if the drying level of the tobacco leaves is d, and the browning level of the tobacco leaves is II, III, IV, V or VI, the wet-bulb temperature of the second-stage heating treatment is 36°C; when the yellowing level of more than 70% of the tobacco leaves is C, if the drying level of the tobacco leaves is e, f, g, h or i, and the browning level of the tobacco leaves is I, the wet-bulb temperature of the second-stage heating treatment is 37°C, and if the drying level of the tobacco leaves is e, f, g, h or i, and the browning level of the tobacco leaves is II, III, IV, V or VI, the wet-bulb temperature of the second-stage heating treatment is 36.5°C;

[0068] When the time of the second stage heating treatment is 12h, the change level of the tobacco leaf state in the curing process is identified, when the yellowing level of more than 70% of the tobacco leaves is D level, the third stage heating treatment is started, the dry ball temperature of the third stage heating treatment is 45℃, the time for increasing the dry ball temperature from the dry ball temperature of the second stage heating treatment to the dry ball temperature of the third stage heating treatment is 6h, and the time of the third stage heating treatment is not less than 12h; when the yellowing level of more than 70% of the tobacco leaves is D level, if the drying level of the tobacco leaves is a, b, c or d level, and the browning level of the tobacco leaves is I level, the wet ball temperature of the third stage heating treatment is 35.5℃, if the drying level of the tobacco leaves is a, b, c or d level, and the browning level of the tobacco leaves is II, III, IV, V or VI level, the wet ball temperature of the third stage heating treatment is 35℃; when the yellowing level of more than 70% of the tobacco leaves is D level, if the drying level of the tobacco leaves is e level, and the browning level of the tobacco leaves is I level, the wet ball temperature of the third stage heating treatment is 36.5℃, if the drying level of the tobacco leaves is e level, and the browning level of the tobacco leaves is II, III, IV, V or VI level, the wet ball temperature of the third stage heating treatment is 36℃; when the yellowing level of more than 70% of the tobacco leaves is D level, if the drying level of the tobacco leaves is f, g, h or i level, and the browning level of the tobacco leaves is I level, the wet ball temperature of the third stage heating treatment is 37℃, if the drying level of the tobacco leaves is f, g, h or i level, and the browning level of the tobacco leaves is II, III, IV, V or VI level, the wet ball temperature of the third stage heating treatment is 36.5℃;

[0069] When the time of the third stage heating treatment is 12h, the change levels of the tobacco leaves during the curing process are identified, and when the yellowing level of more than 70% of the tobacco leaves is E, the fourth stage heating treatment is started, the dry ball temperature of the fourth stage heating treatment is 48℃, the time for increasing the dry ball temperature from the dry ball temperature of the third stage heating treatment to the dry ball temperature of the fourth stage heating treatment is 6h, and the time of the fourth stage heating treatment is not less than 12h; when the yellowing level of more than 70% of the tobacco leaves is E, if the drying level of the tobacco leaves is a, b, c or d, and the browning level of the tobacco leaves is I, the wet ball temperature of the fourth stage heating treatment is 37℃, and if the drying level of the tobacco leaves is a, b, c or d, and the browning level of the tobacco leaves is II, III, IV, V or VI, the wet ball temperature of the fourth stage heating treatment is 36℃; when the yellowing level of more than 70% of the tobacco leaves is E, if the drying level of the tobacco leaves is e, f, g, h or i, and the browning level of the tobacco leaves is I, the wet ball temperature of the fourth stage heating treatment is 38℃, and if the drying level of the tobacco leaves is e, f, g, h or i, and the browning level of the tobacco leaves is II, III, IV, V or VI, the wet ball temperature of the fourth stage heating treatment is 37℃;

[0070] When the time of the fourth stage heating treatment is 12h, the change levels of the tobacco leaves during the curing process are identified, and when the yellowing level of not less than 51% and less than 70% of the tobacco leaves is F, the fifth stage heating treatment is started, the dry ball temperature of the fifth stage heating treatment is 54℃, the time for increasing the dry ball temperature from the dry ball temperature of the fourth stage heating treatment to the dry ball temperature of the fifth stage heating treatment is 10h, and the time of the fifth stage heating treatment is not less than 12h; when the yellowing level of not less than 51% and less than 70% of the tobacco leaves is F, if the drying level of the tobacco leaves is a, b, c, d or e, and the browning level of the tobacco leaves is I, the wet ball temperature of the fifth stage heating treatment is 37.5℃, and if the drying level of the tobacco leaves is a, b, c, d or e, and the browning level of the tobacco leaves is II, III, IV, V or VI, the wet ball temperature of the fifth stage heating treatment is 36.5℃; when the yellowing level of not less than 51% and less than 70% of the tobacco leaves is F, if the drying level of the tobacco leaves is f, g, h or i, and the browning level of the tobacco leaves is I, the wet ball temperature of the fifth stage heating treatment is 38.5℃, and if the drying level of the tobacco leaves is f, g, h or i, and the browning level of the tobacco leaves is II, III, IV, V or VI, the wet ball temperature of the fifth stage heating treatment is 37.5℃;

[0071] When the time of the fifth stage heating treatment is 12h, the change level of the state of the tobacco leaf in the baking process is identified, when the yellowing degree level of more than 70% of the tobacco leaves is F level, the sixth stage heating treatment is started, the dry ball temperature of the sixth stage heating treatment is 60℃, the time for increasing the dry ball temperature from the dry ball temperature of the fifth stage heating treatment to the dry ball temperature of the sixth stage heating treatment is 6h, and the time of the sixth stage heating treatment is 6h; when the yellowing degree level of more than 70% of the tobacco leaves is F level, if the drying degree level of the tobacco leaves is a level, b level, c level, d level, e level or f level, the wet ball temperature of the sixth stage heating treatment is 38℃, and if the drying degree level of the tobacco leaves is g level, h level or i level, the wet ball temperature of the sixth stage heating treatment is 39℃.

[0072] In order to more clearly and simply show the flue-cured tobacco process, the baking heating process of the tobacco leaves with the production place of Henan Province is summarized in Table 1.

[0073] Table 1 Baking heating process of tobacco leaves with the production place of Henan Province

[0074]

[0075]

[0076] The technical solutions of the present application are further described below in combination with specific examples.

[0077] Example 1

[0078] In this example, the central tobacco leaves with the variety of Zhongyan 100 are taken as the experimental objects, the planting area of the tobacco leaves is located in Pingdingshan City, Henan Province, the experimental tobacco field is selected to be flat and contiguous, the optimal local management measures are used in the field growth period, and the central tobacco leaves are harvested once after reaching the local normal maturity harvesting standard. In order to intelligently identify the state of the tobacco leaves in the baking process and improve the convenience of processing, the image data set of the state of the tobacco leaves in the baking process needs to be obtained first, and then the artificial intelligence identification algorithm is established according to the image data set of the state of the tobacco leaves. The method for obtaining the image data set of the state of the tobacco leaves is as follows: an image intelligent sampling device with a camera is installed in a tobacco oven (airflow descending type oven), the image intelligent sampling device used in this example is the utility model patent with the authorized announcement number CN217509854U, and the image data set of the state of the tobacco leaves in the baking process is obtained by using the image intelligent sampling device. Figure 1The image intelligent acquisition device is placed in the parallel position of the tobacco loading rack and the tobacco clamp / tobacco rod in the tobacco drying room through the support plate 1, and is specifically located at the position of the shelf close to the heating chamber in the tobacco drying room (installed at this position does not affect the tobacco farmer to load tobacco, does not affect the air flow movement, and does not affect the drying effect), as shown in Figure 2 As shown in Figure 2 The image intelligent acquisition device includes a support plate 1, a ventilation hole 2, a wiring hole 3, a connecting rod 4, a telescopic adjuster 5, a universal adjusting nut 6, a camera 7, a color card hanging hole 8, and a color card 9. The tobacco leaf images at different stages in the drying process during the establishment of the tobacco leaf state image data set are as shown in Figure 3 The color card in the image intelligent acquisition device is used for correction of the color of the camera. Figure 3 In this embodiment, the maturity harvesting standard of the middle tobacco leaf is executed according to the provisions in the industry standard GB / T 23219-2008, and specifically as follows: the basic color of the tobacco leaf is yellow-green, more than two-thirds of the leaf surface is yellow, the main vein is white, one-half of the branch vein is white, the leaf tip and leaf edge are yellow, the leaf surface has yellow mature spots, and the stem-leaf angle is increased; the leaf age is 60-70 days.

[0079] After the artificial intelligence recognition algorithm is established, 1000 pieces of tobacco leaves with basically consistent mature characteristics are selected from the harvested tobacco leaves, and 500 pieces of the tobacco leaves are placed in a tobacco drying room (airflow descending type drying room) for drying. In order to intelligently recognize the state of the tobacco leaf in the drying process, the image intelligent acquisition device is placed in the parallel position of the tobacco loading rack and the tobacco clamp / tobacco rod in the tobacco drying room through the support plate 1, and is specifically located at the position of the shelf close to the heating chamber in the tobacco drying room (installed at this position does not affect the tobacco farmer to load tobacco, does not affect the air flow movement, and does not affect the drying effect), as shown in Figure 4 The tobacco leaf is then dried, and the self-adaptive optimization tobacco leaf drying method of this embodiment specifically includes the following steps:

[0080] (1) The tobacco leaf is first preheated, and the preheating includes first stage preheating and second stage preheating in sequence. The dry bulb temperature of the first stage preheating is 36℃, the wet bulb temperature is 35℃, and the holding time is 6h. The temperature rising rate from the room temperature to the dry bulb temperature (36℃) used in the first stage preheating is 1℃ / h; the dry bulb temperature of the second stage preheating is 38℃, the wet bulb temperature is 36.5℃, and the holding time is (12+x)h. The temperature rising rate from the dry bulb temperature (36℃) used in the first stage preheating to the dry bulb temperature (38℃) used in the second stage preheating is 0.5℃ / h; wherein x is the difference between the time when the first stage heating treatment is started and the time corresponding to the time of 12h when the second stage preheating is reached;

[0081] (2) after the pre-heating is finished, start the multi-stage temperature rising heat treatment on the tobacco leaves, the multi-stage temperature rising heat treatment includes 6 heating treatment stages which are performed in sequence, the start of each stage of heating treatment, the dry-bulb temperature, the wet-bulb temperature and the time of each stage of heating treatment are determined by the change level of the tobacco leaves during the curing process;

[0082] The multi-stage temperature rising heat treatment specifically includes the following steps:

[0083] When the time of the second stage pre-heating is 12h, start to identify the change level of the tobacco leaves (the change level includes the yellowing degree level, the drying degree level and the browning degree level), identify once every 0.5h, the probability of the yellowing degree level being B level reaches more than 70% for the first time at the 5th identification (i.e. more than 70% of the number of the tobacco leaves has the yellowing degree level of B level, in this embodiment, more than 70% of the number of the tobacco leaves in the image has the yellowing degree level of B level), the probability of the yellowing degree level being B level also reaches more than 70% at the 6th identification (i.e. more than 70% of the number of the tobacco leaves has the yellowing degree level of B level, in this embodiment, more than 70% of the number of the tobacco leaves in the image has the yellowing degree level of B level), therefore, the starting condition of the first stage heating treatment is met at this time, the dry-bulb temperature of the first stage heating treatment is 40℃, and at the same time, the drying degree level is detected to be c level at the 6th identification, the wet-bulb temperature of the first stage heating treatment needs to be controlled at 36.5℃; after the 6th identification is finished, stop the identification, start to rise the temperature, uniformly raise the dry-bulb temperature to 40℃, the temperature rising time (the time of raising the dry-bulb temperature from the dry-bulb temperature of the pre-heating to the dry-bulb temperature of the first stage heating treatment) is 4h, and at the same time, control the wet-bulb temperature at 36.5℃; the time of the first stage heating treatment is 12h;

[0084] After the first stage of heating treatment, the change level of the tobacco leaf state (the change level includes the yellowing level, the drying level, and the browning level) is continuously identified, and the identification is performed once every 0.5 h. The probability of the yellowing level being C level reaches more than 70% for the first time at the seventh identification (that is, the yellowing level of more than 70% of the tobacco leaves is C level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is C level). The probability of the yellowing level being C level also reaches more than 70% at the eighth identification (that is, the yellowing level of more than 70% of the tobacco leaves is C level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is C level). Therefore, the starting condition of the second stage of heating treatment is met at this time, the dry-bulb temperature of the second stage of heating treatment is 42°C, the drying level is detected to be c level at the eighth identification, and the browning level is detected to be II level. The wet-bulb temperature of the second stage of heating treatment needs to be controlled at 35°C. After the eighth identification is completed, the identification is stopped, the temperature is increased, the dry-bulb temperature is uniformly increased to 42°C, the temperature increasing time (the time for increasing the dry-bulb temperature from the dry-bulb temperature of the first stage of heating treatment to the dry-bulb temperature of the second stage of heating treatment) is 4 h, and the wet-bulb temperature is controlled at 35°C. The second stage of heating treatment lasts for 12 h.

[0085] After the second stage of heating treatment, the change level of the tobacco leaf state (the change level includes the yellowing level, the drying level, and the browning level) is continuously identified, and the identification is performed once every 0.5 h. The probability of the yellowing level being D level reaches more than 70% for the first time at the fifth identification (that is, the yellowing level of more than 70% of the tobacco leaves is D level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is D level). The probability of the yellowing level being D level also reaches more than 70% at the sixth identification (that is, the yellowing level of more than 70% of the tobacco leaves is D level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is D level). Therefore, the starting condition of the third stage of heating treatment is met at this time, the dry-bulb temperature of the third stage of heating treatment is 45°C, the drying level is detected to be e level at the sixth identification, and the browning level is detected to be II level. The wet-bulb temperature of the third stage of heating treatment needs to be controlled at 36°C. After the sixth identification is completed, the identification is stopped, the temperature is increased, the dry-bulb temperature is uniformly increased to 45°C, the temperature increasing time (the time for increasing the dry-bulb temperature from the dry-bulb temperature of the second stage of heating treatment to the dry-bulb temperature of the third stage of heating treatment) is 6 h, and the wet-bulb temperature is controlled at 36°C. The third stage of heating treatment lasts for 12 h.

[0086] After the third stage heating treatment ends, the change level of the tobacco leaf state (the change level includes the yellowing level, the drying level, and the browning level) is continuously identified, and the identification is performed once every 0.5 h. The probability of the yellowing level being E level at the third identification reaches more than 70% for the first time (that is, the yellowing level of more than 70% of the tobacco leaves is E level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is E level). The probability of the yellowing level being E level at the fourth identification also reaches more than 70% (that is, the yellowing level of more than 70% of the tobacco leaves is E level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is E level). Therefore, the starting condition of the fourth stage heating treatment is met at this time, the dry-bulb temperature of the fourth stage heating treatment is 48°C, the drying level is g level is detected at the fourth identification, and the browning level is III level. The wet-bulb temperature of the fourth stage heating treatment needs to be controlled at 37°C. After the fourth identification ends, the identification is stopped, the temperature is increased, the dry-bulb temperature is uniformly increased to 48°C, the temperature increasing time (the time for increasing the dry-bulb temperature from the dry-bulb temperature of the third stage heating treatment to the dry-bulb temperature of the fourth stage heating treatment) is 6 h, and the wet-bulb temperature is controlled at 37°C. The fourth stage heating treatment time is 12 h.

[0087] After the fourth stage heating treatment ends, the change level of the tobacco leaf state (the change level includes the yellowing level, the drying level, and the browning level) is continuously identified, and the identification is performed once every 0.5 h. The probability of the yellowing level being F level at the second identification reaches more than 51% for the first time (55%) (that is, the yellowing level of 55% of the tobacco leaves is F level, and in this embodiment, the yellowing level of 55% of the tobacco leaves in the image is F level). Therefore, the starting condition of the fifth stage heating treatment is met at this time, the dry-bulb temperature of the fifth stage heating treatment is 54°C, the drying level is h level is detected at the third identification, and the browning level is III level. The wet-bulb temperature of the fifth stage heating treatment needs to be controlled at 37.5°C. After the third identification ends, the identification is stopped, the temperature is increased, the dry-bulb temperature is uniformly increased to 54°C, the temperature increasing time (the time for increasing the dry-bulb temperature from the dry-bulb temperature of the fourth stage heating treatment to the dry-bulb temperature of the fifth stage heating treatment) is 10 h, and the wet-bulb temperature is controlled at 37.5°C. The fifth stage heating treatment time is 12 h.

[0088] After the end of the fifth stage heating treatment, the change level of the tobacco leaf state (the change level includes the yellowing level, the drying level and the browning level) is continuously identified, and the identification is performed once every 0.5 h. The probability of the yellowing level being F level at the second identification reaches more than 70% for the first time (i.e., more than 70% of the number of the tobacco leaves has the yellowing level of F level, and in this embodiment, more than 70% of the number of the tobacco leaves in the image has the yellowing level of F level). Therefore, the starting condition of the sixth stage heating treatment is met at this time, the dry-bulb temperature of the sixth stage heating treatment is 60°C, and the wet-bulb temperature of the sixth stage heating treatment needs to be controlled at 39°C. After the end of the third identification, the identification is stopped, the temperature is increased, the dry-bulb temperature is uniformly increased to 60°C, the temperature increasing time (the time for increasing the dry-bulb temperature from the dry-bulb temperature of the fifth stage heating treatment to the dry-bulb temperature of the sixth stage heating treatment) is 6 h, and the wet-bulb temperature is controlled at 39°C. The time of the sixth stage heating treatment is 6 h.

[0089] (3) After the end of the sixth stage heating treatment (i.e., after the end of the multi-stage temperature increasing heat treatment), the final stage heat treatment is started. The dry-bulb temperature of the final stage heat treatment is 68°C, the wet-bulb temperature is 41°C, and the time for increasing the dry-bulb temperature from the dry-bulb temperature of the sixth stage heating treatment to the dry-bulb temperature of the final stage heat treatment is 8 h. During the final stage heat treatment, the change level of the tobacco leaf state does not need to be identified.

[0090] When the time of the final stage heat treatment reaches 16 h, the detection and identification of the relative humidity on the tobacco barn control instrument are started. When the relative humidity on the tobacco barn control instrument decreases to 12%, the final stage heat treatment is ended, and the flue-cured tobacco process is ended.

[0091] In the specific implementation of this embodiment, the control of the dry-bulb temperature and the wet-bulb temperature in the tobacco barn is completed by transmitting the control command (the control command is generated according to the identification result) to the temperature regulating device and the humidity regulating device of the tobacco barn through the communication module.

[0092] Example 2

[0093] This embodiment uses the upper leaves of the Zhongyan 100 variety as the experimental subject. The tobacco planting area is located in Pingdingshan City, Henan Province. Flat, contiguous tobacco fields were selected for the experiment. Optimal local management measures were adopted during the field growth period. The upper leaves were harvested once when they reached the local normal maturity harvest standard. To intelligently identify parameters such as the state of the tobacco leaves during the curing process and improve processing convenience, it is necessary to first obtain a dataset of tobacco leaf state images during the curing process, and then establish an artificial intelligence recognition algorithm based on this dataset. The method for obtaining the tobacco leaf state image dataset is as follows: An image acquisition device with a camera is installed in the tobacco curing barn (airflow descending curing barn). (The image acquisition device used in this embodiment is based on the utility model patent with authorization announcement number CN217509854U.) Figure 1 The device shown is used to cure a large number of tobacco leaves using conventional flue-curing methods, while simultaneously acquiring images of the tobacco leaves during the curing process. These images are then annotated by experts to create a dataset of tobacco leaf images representing different levels of yellowing, dryness, and browning. After acquiring the tobacco leaf image dataset, a deep learning model using the Vision Transformer (ViT) is trained to establish an artificial intelligence recognition algorithm. The image acquisition device used in this embodiment is the same as that used in Embodiment 1. In this embodiment, images of tobacco leaves at different stages of the curing process are shown in the image dataset. Figure 5 As shown. In this embodiment, the maturity harvesting standard for the upper tobacco leaves is implemented in accordance with the provisions of industry standard GB / T 23219-2008, specifically as follows: the basic color of the tobacco leaves is yellow, the leaf surface is fully yellowed, wrinkled, with obvious maturity spots, the leaf tips droop, the leaf edges are curved and wrinkled, and the stem-leaf angle is significantly increased; the leaf age is 70-90 days.

[0094] After establishing an artificial intelligence recognition algorithm, 1000 tobacco leaves with basically consistent maturity characteristics are selected from the harvested tobacco leaves, and 500 of these leaves are placed in a tobacco curing barn (airflow downdraft curing barn) for curing. In order to intelligently recognize the state of the tobacco leaves during the curing process, an image acquisition device is placed in the curing barn parallel to the tobacco rack and tobacco clips / stems via a support plate, specifically in the middle of the curing barn near the heating chamber. Then the curing of the tobacco leaves begins. The adaptive optimization tobacco curing method of this embodiment specifically includes the following steps:

[0095] (1) first preheating the tobacco leaves, the preheating including first-stage preheating and second-stage preheating performed in sequence, the first-stage preheating having a dry-bulb temperature of 36℃ and a wet-bulb temperature of 35℃, and a holding time of 6h, the temperature rising rate from room temperature to the dry-bulb temperature (36℃) used in the first-stage preheating being 1℃ / h; the second-stage preheating having a dry-bulb temperature of 38℃ and a wet-bulb temperature of 36.5℃, and a holding time of 12h, the temperature rising rate from the dry-bulb temperature (36℃) used in the first-stage preheating to the dry-bulb temperature (38℃) used in the second-stage preheating being 0.5℃ / h;

[0096] (2) after the preheating, starting multi-stage temperature rising heat treatment on the tobacco leaves, the multi-stage temperature rising heat treatment including six heating treatment stages performed in sequence, the start of each stage of heating treatment, the dry-bulb temperature, the wet-bulb temperature and the time used in each stage of heating treatment being determined by the change level of the tobacco leaves in the curing process;

[0097] The multi-stage temperature rising heat treatment specifically includes the following steps:

[0098] After the preheating, the change level of the tobacco leaves (the change level including the yellowing degree level, the drying degree level and the browning degree level) is identified, the identification being performed once every 0.5h, the probability of the yellowing degree level being B level at the 7th identification reaching 70% for the first time (i.e. 70% or more of the tobacco leaves have the yellowing degree level of B level, in this embodiment, 70% or more of the tobacco leaves in the image have the yellowing degree level of B level), and the probability of the yellowing degree level being B level at the 8th identification also reaching 70% (i.e. 70% or more of the tobacco leaves have the yellowing degree level of B level, in this embodiment, 70% or more of the tobacco leaves in the image have the yellowing degree level of B level), therefore, at this time, the start condition of the first-stage heating treatment is met, the dry-bulb temperature of the first-stage heating treatment being 40℃, and at the same time, the drying degree level being b level is detected at the 8th identification, the wet-bulb temperature of the first-stage heating treatment needing to be controlled at 36℃; after the 8th identification, the identification is stopped, the temperature is raised at a constant speed to 40℃, the temperature rising time (the time from the dry-bulb temperature of the preheating to the dry-bulb temperature of the first-stage heating treatment) being 4h, and at the same time, the wet-bulb temperature is controlled at 36℃; the first-stage heating treatment time being 12h;

[0099] After the first stage of heating treatment, the change level of the tobacco leaf state (the change level includes the yellowing level, the drying level, and the browning level) is continuously identified, and the identification is performed once every 0.5 h. The probability of the yellowing level being C level reaches more than 70% for the first time at the 9th identification (that is, the yellowing level of more than 70% of the tobacco leaves is C level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is C level). The probability of the yellowing level being C level also reaches more than 70% at the 10th identification (that is, the yellowing level of more than 70% of the tobacco leaves is C level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is C level). Therefore, the starting condition of the second stage of heating treatment is met at this time, the dry-bulb temperature of the second stage of heating treatment is 42°C, the drying level is detected to be e level at the 10th identification, and the browning level is detected to be II level. The wet-bulb temperature of the second stage of heating treatment needs to be controlled at 36.5°C. After the 10th identification, the identification is stopped, the temperature is increased, the dry-bulb temperature is uniformly increased to 42°C, the temperature increasing time (the time for increasing the dry-bulb temperature from the dry-bulb temperature of the first stage of heating treatment to the dry-bulb temperature of the second stage of heating treatment) is 4 h, and the wet-bulb temperature is controlled at 36.5°C. The second stage of heating treatment lasts for 12 h.

[0100] After the second stage of heating treatment, the change level of the tobacco leaf state (the change level includes the yellowing level, the drying level, and the browning level) is continuously identified, and the identification is performed once every 0.5 h. The probability of the yellowing level being D level reaches more than 70% for the first time at the 7th identification (that is, the yellowing level of more than 70% of the tobacco leaves is D level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is D level). The probability of the yellowing level being D level also reaches more than 70% at the 8th identification (that is, the yellowing level of more than 70% of the tobacco leaves is D level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is D level). Therefore, the starting condition of the third stage of heating treatment is met at this time, the dry-bulb temperature of the third stage of heating treatment is 45°C, the drying level is detected to be f level at the 8th identification, and the browning level is detected to be IV level. The wet-bulb temperature of the third stage of heating treatment needs to be controlled at 36.5°C. After the 8th identification, the identification is stopped, the temperature is increased, the dry-bulb temperature is uniformly increased to 45°C, the temperature increasing time (the time for increasing the dry-bulb temperature from the dry-bulb temperature of the second stage of heating treatment to the dry-bulb temperature of the third stage of heating treatment) is 6 h, and the wet-bulb temperature is controlled at 36.5°C. The third stage of heating treatment lasts for 12 h.

[0101] After the third stage heating treatment ends, the change level of the tobacco leaf state (the change level includes the yellowing level, the drying level, and the browning level) is continuously identified, and the identification is performed once every 0.5 h. The probability of the yellowing level being E level reaches more than 70% for the first time at the fourth identification (that is, the yellowing level of more than 70% of the tobacco leaves is E level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is E level). The probability of the yellowing level being E level also reaches more than 70% at the fifth identification (that is, the yellowing level of more than 70% of the tobacco leaves is E level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is E level). Therefore, the starting condition of the fourth stage heating treatment is met at this time, the dry-bulb temperature of the fourth stage heating treatment is 48°C, the wet-bulb temperature of the fourth stage heating treatment needs to be controlled at 37°C at the same time, the drying level is g level, and the browning level is IV level are detected at the fifth identification. After the fifth identification ends, the identification is stopped, the temperature is increased, the dry-bulb temperature is uniformly increased to 48°C, the temperature increasing time (the time for increasing the dry-bulb temperature from the dry-bulb temperature of the third stage heating treatment to the dry-bulb temperature of the fourth stage heating treatment) is 6 h, and the wet-bulb temperature is controlled at 37°C at the same time. The fourth stage heating treatment time is 12 h.

[0102] After the fourth stage heating treatment ends, the change level of the tobacco leaf state (the change level includes the yellowing level, the drying level, and the browning level) is continuously identified, and the identification is performed once every 0.5 h. The probability of the yellowing level being F level reaches more than 51% (55%) for the first time at the second identification (that is, the yellowing level of 55% of the tobacco leaves is F level, and in this embodiment, the yellowing level of 55% of the tobacco leaves in the image is F level). Therefore, the starting condition of the fifth stage heating treatment is met at this time, the dry-bulb temperature of the fifth stage heating treatment is 54°C, the wet-bulb temperature of the fifth stage heating treatment needs to be controlled at 37.5°C at the same time, the drying level is h level, and the browning level is IV level are detected at the third identification. After the third identification ends, the identification is stopped, the temperature is increased, the dry-bulb temperature is uniformly increased to 54°C, the temperature increasing time (the time for increasing the dry-bulb temperature from the dry-bulb temperature of the fourth stage heating treatment to the dry-bulb temperature of the fifth stage heating treatment) is 10 h, and the wet-bulb temperature is controlled at 37.5°C at the same time. The fifth stage heating treatment time is 12 h.

[0103] After the end of the fifth stage heating treatment, the change level of the tobacco leaf state (the change level includes the yellowing level, the drying level and the browning level) is continuously identified, and the identification is performed once every 0.5 h. The probability of the yellowing level being F level at the fifth identification reaches 70% for the first time (i.e., the yellowing level of more than 70% of the tobacco leaves in the image is F level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is F level). Therefore, the starting condition of the sixth stage heating treatment is met at this time, the dry-bulb temperature of the sixth stage heating treatment is 60°C, and the wet-bulb temperature of the sixth stage heating treatment needs to be controlled at 39°C. After the end of the third identification, the identification is stopped, the temperature is increased, the dry-bulb temperature is uniformly increased to 60°C, the temperature increasing time (the time for increasing the dry-bulb temperature from the dry-bulb temperature of the fifth stage heating treatment to the dry-bulb temperature of the sixth stage heating treatment) is 6 h, and the wet-bulb temperature is controlled at 39°C. The time of the sixth stage heating treatment is 6 h.

[0104] (3) After the end of the sixth stage heating treatment (i.e., after the end of the multi-stage temperature increasing heat treatment), the final stage heat treatment is started. The dry-bulb temperature of the final stage heat treatment is 68°C, the wet-bulb temperature is 41°C, and the time for increasing the dry-bulb temperature from the dry-bulb temperature of the sixth stage heating treatment to the dry-bulb temperature of the final stage heat treatment is 8 h. During the final stage heat treatment, the change level of the tobacco leaf state does not need to be identified.

[0105] When the time of the final stage heat treatment reaches 16 h, the detection and identification of the relative humidity on the tobacco barn control instrument are started. When the relative humidity on the tobacco barn control instrument decreases to 12%, the final stage heat treatment is ended, and the tobacco curing process is ended.

[0106] In the specific implementation of this embodiment, the control of the dry-bulb temperature and the wet-bulb temperature in the tobacco barn is completed by transmitting the control command (the control command is generated according to the identification result) to the temperature regulating device and the humidity regulating device of the tobacco barn through the communication module.

[0107] Example 3

[0108] This embodiment uses the upper leaves of the Yunyan 87 tobacco variety as the experimental object. The tobacco planting area is located in Sanmenxia City, Henan Province. Flat, contiguous tobacco fields were selected for the experiment. Optimal local management measures were adopted during the field growth period. The upper leaves were harvested once they reached the local normal maturity harvest standard. To intelligently identify parameters such as the tobacco leaf state during the curing process and improve processing convenience, it is necessary to first obtain a dataset of tobacco leaf state images during the curing process, and then establish an artificial intelligence recognition algorithm based on this dataset. The method for obtaining the tobacco leaf state image dataset is as follows: An image acquisition device with a camera is installed in the tobacco curing barn (airflow descending curing barn). (The image acquisition device used in this embodiment is based on the utility model patent with authorization announcement number CN217509854U.) Figure 1 The device shown is used to cure a large number of tobacco leaves using conventional flue-curing methods, while simultaneously acquiring images of the tobacco leaves during the curing process. These images are then annotated by experts to create a dataset of tobacco leaf images representing different levels of yellowing, dryness, and browning. After acquiring the tobacco leaf image dataset, a deep learning model using the Vision Transformer (ViT) artificial intelligence model is trained to establish an artificial intelligence recognition algorithm. The image acquisition device used in this embodiment is the same as that used in Embodiment 1. In this embodiment, the maturity harvesting standard for the upper tobacco leaves is implemented according to the industry standard GB / T 23219-2008, specifically as follows: the basic color of the tobacco leaves is yellow, the leaf surface is fully yellowed, wrinkled, with obvious maturity spots, drooping leaf tips, wrinkled leaf edges, and a significantly increased stem-leaf angle; the leaf age is 70–90 days.

[0109] After establishing an artificial intelligence recognition algorithm, 1000 tobacco leaves with basically consistent maturity characteristics are selected from the harvested tobacco leaves, and 500 of these leaves are placed in a tobacco curing barn (airflow downdraft curing barn) for curing. In order to intelligently recognize the state of the tobacco leaves during the curing process, an image acquisition device is placed in the curing barn parallel to the tobacco rack and tobacco clips / stems via a support plate, specifically in the middle of the curing barn near the heating chamber. Then the curing of the tobacco leaves begins. The adaptive optimization tobacco curing method of this embodiment specifically includes the following steps:

[0110] (1) first preheat the tobacco leaves, the preheating includes first stage preheating and second stage preheating in turn, the dry ball temperature of first stage preheating is 36 DEG C, the wet ball temperature is 35 DEG C, the holding time is 6h, the heating rate from room temperature to the dry ball temperature (36 DEG C) used in first stage preheating is 1 DEG C / h; the dry ball temperature of second stage preheating is 38 DEG C, the wet ball temperature is 36.5 DEG C, the holding time is 12h, the heating rate from the dry ball temperature (36 DEG C) used in first stage preheating to the dry ball temperature (38 DEG C) used in second stage preheating is 0.5 DEG C / h;

[0111] (2) after preheating, start multi-stage heating treatment to the tobacco leaves, the multi-stage heating treatment includes six heating treatment stages in turn, the start of each stage heating treatment, the dry ball temperature, the wet ball temperature and the time of each stage heating treatment are determined by the change level of tobacco leaves state in the curing process;

[0112] The multi-stage heating treatment specifically includes the following steps:

[0113] After preheating, the change level of tobacco leaves state (the change level includes the yellowing degree level, the drying degree level and the browning degree level) is identified, and the identification is performed once every 0.5h, the probability of the yellowing degree level being B level reaches more than 70% for the first time at the sixth identification (that is, more than 70% of the tobacco leaves have the yellowing degree level of B level, and in the embodiment, more than 70% of the tobacco leaves in the image have the yellowing degree level of B level), and the probability of the yellowing degree level being B level also reaches more than 70% at the seventh identification (that is, more than 70% of the tobacco leaves have the yellowing degree level of B level, and in the embodiment, more than 70% of the tobacco leaves in the image have the yellowing degree level of B level), therefore, the starting condition of first stage heating treatment is met at this time, the dry ball temperature of first stage heating treatment is 40 DEG C, and the wet ball temperature of first stage heating treatment needs to be controlled at 36.5 DEG C at the same time, the drying degree level is detected to be c level at the eighth identification; after the seventh identification is finished, the identification is stopped, the heating is started, the dry ball temperature is uniformly heated to 40 DEG C, the heating time (the time from the dry ball temperature of preheating to the dry ball temperature of first stage heating treatment) is 4h, and the wet ball temperature is controlled at 36.5 DEG C; the time of first stage heating treatment is 12h;

[0114] After the first stage of heating treatment, the change level of the tobacco leaf state (the change level includes the yellowing level, the drying level, and the browning level) is continuously identified, and the identification is performed once every 0.5 h. The probability of the yellowing level being C level reaches more than 70% for the first time at the seventh identification (that is, the yellowing level of more than 70% of the tobacco leaves is C level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is C level). The probability of the yellowing level being C level also reaches more than 70% at the eighth identification (that is, the yellowing level of more than 70% of the tobacco leaves is C level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is C level). Therefore, the starting condition of the second stage of heating treatment is met at this time, the dry-bulb temperature of the second stage of heating treatment is 42°C, the drying level is detected to be e level at the eighth identification, and the browning level is detected to be I level. The wet-bulb temperature of the second stage of heating treatment needs to be controlled at 37.0°C. After the eighth identification is completed, the identification is stopped, the temperature is increased, the dry-bulb temperature is uniformly increased to 42°C, the temperature increasing time (the time for increasing the dry-bulb temperature from the dry-bulb temperature of the first stage of heating treatment to the dry-bulb temperature of the second stage of heating treatment) is 4 h, and the wet-bulb temperature is controlled at 37°C. The second stage of heating treatment lasts for 12 h.

[0115] After the second stage of heating treatment, the change level of the tobacco leaf state (the change level includes the yellowing level, the drying level, and the browning level) is continuously identified, and the identification is performed once every 0.5 h. The probability of the yellowing level being D level reaches more than 70% for the first time at the sixth identification (that is, the yellowing level of more than 70% of the tobacco leaves is D level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is D level). The probability of the yellowing level being D level also reaches more than 70% at the seventh identification (that is, the yellowing level of more than 70% of the tobacco leaves is D level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is D level). Therefore, the starting condition of the third stage of heating treatment is met at this time, the dry-bulb temperature of the third stage of heating treatment is 45°C, the drying level is detected to be f level at the seventh identification, and the browning level is detected to be II level. The wet-bulb temperature of the third stage of heating treatment needs to be controlled at 36.5°C. After the seventh identification is completed, the identification is stopped, the temperature is increased, the dry-bulb temperature is uniformly increased to 45°C, the temperature increasing time (the time for increasing the dry-bulb temperature from the dry-bulb temperature of the second stage of heating treatment to the dry-bulb temperature of the third stage of heating treatment) is 6 h, and the wet-bulb temperature is controlled at 36.5°C. The third stage of heating treatment lasts for 12 h.

[0116] After the third stage heating treatment ends, the change level of the tobacco leaf state (the change level includes the yellowing level, the drying level, and the browning level) is continuously identified, and the identification is performed once every 0.5 h. The probability of the yellowing level being E level reaches more than 70% for the first time at the fifth identification (that is, the yellowing level of more than 70% of the tobacco leaves is E level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is E level). The probability of the yellowing level being E level also reaches more than 70% at the sixth identification (that is, the yellowing level of more than 70% of the tobacco leaves is E level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is E level). Therefore, the starting condition of the fourth stage heating treatment is met at this time, the dry-bulb temperature of the fourth stage heating treatment is 48°C, the drying level is g level is detected at the fifth identification, and the browning level is II level. The wet-bulb temperature of the fourth stage heating treatment needs to be controlled at 37°C. After the sixth identification ends, the identification is stopped, the temperature is increased, the dry-bulb temperature is uniformly increased to 48°C, the temperature increasing time (the time for increasing the dry-bulb temperature from the dry-bulb temperature of the third stage heating treatment to the dry-bulb temperature of the fourth stage heating treatment) is 6 h, and the wet-bulb temperature is controlled at 37°C. The fourth stage heating treatment time is 12 h.

[0117] After the fourth stage heating treatment ends, the change level of the tobacco leaf state (the change level includes the yellowing level, the drying level, and the browning level) is continuously identified, and the identification is performed once every 0.5 h. The probability of the yellowing level being F level reaches more than 51% (55%) for the first time at the second identification (that is, the yellowing level of 55% of the tobacco leaves is F level, and in this embodiment, the yellowing level of 55% of the tobacco leaves in the image is F level). Therefore, the starting condition of the fifth stage heating treatment is met at this time, the dry-bulb temperature of the fifth stage heating treatment is 54°C, the drying level is h level is detected at the third identification, and the browning level is II level. The wet-bulb temperature of the fifth stage heating treatment needs to be controlled at 37.5°C. After the third identification ends, the identification is stopped, the temperature is increased, the dry-bulb temperature is uniformly increased to 54°C, the temperature increasing time (the time for increasing the dry-bulb temperature from the dry-bulb temperature of the fourth stage heating treatment to the dry-bulb temperature of the fifth stage heating treatment) is 10 h, and the wet-bulb temperature is controlled at 37.5°C. The fifth stage heating treatment time is 12 h.

[0118] After the end of the fifth stage heating treatment, the change level of the tobacco leaf state (the change level includes the yellowing level, the drying level and the browning level) is continuously identified, and the identification is performed once every 0.5 h. The probability of the yellowing level being F level at the seventh identification reaches 70% for the first time (i.e., the yellowing level of more than 70% of the tobacco leaves is F level, and in this embodiment, the yellowing level of more than 70% of the tobacco leaves in the image is F level). Therefore, the starting condition of the sixth stage heating treatment is met at this time, the dry-bulb temperature of the sixth stage heating treatment is 60°C, and at the same time, the drying level is detected to be h level at the seventh identification. The wet-bulb temperature of the sixth stage heating treatment needs to be controlled at 39°C. After the end of the seventh identification, the identification is stopped, the temperature is increased, the dry-bulb temperature is uniformly increased to 60°C, the temperature increasing time (the time for increasing the dry-bulb temperature from the dry-bulb temperature of the fifth stage heating treatment to the dry-bulb temperature of the sixth stage heating treatment) is 6 h, and at the same time, the wet-bulb temperature is controlled at 39°C. The time of the sixth stage heating treatment is 6 h.

[0119] (3) After the end of the sixth stage heating treatment (i.e., after the end of the multi-stage temperature increasing heat treatment), the final stage heat treatment is started. The dry-bulb temperature of the final stage heat treatment is 68°C, the wet-bulb temperature is 41°C, and the time for increasing the dry-bulb temperature from the dry-bulb temperature of the sixth stage heating treatment to the dry-bulb temperature of the final stage heat treatment is 8 h. During the final stage heat treatment, the change level of the tobacco leaf state does not need to be identified.

[0120] When the time of the final stage heat treatment reaches 16 h, the detection and identification of the relative humidity on the tobacco barn control instrument are started. When the relative humidity on the tobacco barn control instrument decreases to 12%, the final stage heat treatment ends, and the tobacco curing process ends.

[0121] In the specific implementation of this embodiment, the control commands (the control commands are generated according to the identification results) are transmitted to the temperature regulating device and the humidity regulating device of the tobacco barn through the communication module to complete the control of the dry-bulb temperature and the wet-bulb temperature in the tobacco barn.

[0122] Comparative Example 1

[0123] In order to compare the traditional tobacco curing method with the tobacco curing method of Example 1, 500 pieces of tobacco leaves selected from the 1000 pieces of tobacco leaves in Example 1 are placed in the same tobacco leaf curing barn as in Example 1 for curing. The tobacco curing method of this comparative example specifically includes the following steps:

[0124] (1) The tobacco leaves are sequentially subjected to first-stage heat treatment, second-stage heat treatment, third-stage heat treatment and fourth-stage heat treatment, the dry-bulb temperature of the first-stage heat treatment is 36℃, the wet-bulb temperature is 35℃, the time of the first-stage heat treatment is 3h, the temperature rising time from room temperature to the dry-bulb temperature of the first-stage heat treatment is 6h; the dry-bulb temperature of the second-stage heat treatment is 38℃, the wet-bulb temperature is 36℃, the time of the second-stage heat treatment is 36h, the temperature rising time from the dry-bulb temperature of the first-stage heat treatment to the dry-bulb temperature of the second-stage heat treatment is 4h; the dry-bulb temperature of the third-stage heat treatment is 40℃, the wet-bulb temperature is 36℃, the time of the third-stage heat treatment is 20h, the temperature rising time from the dry-bulb temperature of the second-stage heat treatment to the dry-bulb temperature of the third-stage heat treatment is 4h; the dry-bulb temperature of the fourth-stage heat treatment is 42℃, the wet-bulb temperature is 36℃, the time of the fourth-stage heat treatment is 20h, the temperature rising time from the dry-bulb temperature of the third-stage heat treatment to the dry-bulb temperature of the fourth-stage heat treatment is 4h; the first-stage heat treatment, the second-stage heat treatment, the third-stage heat treatment and the fourth-stage heat treatment are the yellowing period of the tobacco leaves;

[0125] (2) Then the tobacco leaves are sequentially subjected to fifth-stage heat treatment, sixth-stage heat treatment and seventh-stage heat treatment, the dry-bulb temperature of the fifth-stage heat treatment is 45℃, the wet-bulb temperature is 35℃, the time of the fifth-stage heat treatment is 20h, the temperature rising time from the dry-bulb temperature of the fourth-stage heat treatment to the dry-bulb temperature of the fifth-stage heat treatment is 6h; the dry-bulb temperature of the sixth-stage heat treatment is 48℃, the wet-bulb temperature is 37℃, the time of the sixth-stage heat treatment is 15h, the temperature rising time from the dry-bulb temperature of the fifth-stage heat treatment to the dry-bulb temperature of the sixth-stage heat treatment is 6h; the dry-bulb temperature of the seventh-stage heat treatment is 54℃, the wet-bulb temperature is 38℃, the time of the seventh-stage heat treatment is 12h, the temperature rising time from the dry-bulb temperature of the sixth-stage heat treatment to the dry-bulb temperature of the seventh-stage heat treatment is 12h; the fifth-stage heat treatment, the sixth-stage heat treatment and the seventh-stage heat treatment are the color fixing period of the tobacco leaves;

[0126] (3) Finally, the tobacco leaves are sequentially subjected to eighth-stage heat treatment and ninth-stage heat treatment, the dry-bulb temperature of the eighth-stage heat treatment is 60℃, the wet-bulb temperature is 41℃, the time of the eighth-stage heat treatment is 39h, the temperature rising time from the dry-bulb temperature of the seventh-stage heat treatment to the dry-bulb temperature of the eighth-stage heat treatment is 8h; the dry-bulb temperature of the ninth-stage heat treatment is 68℃, the wet-bulb temperature is 41℃, the temperature rising time from the dry-bulb temperature of the eighth-stage heat treatment to the dry-bulb temperature of the ninth-stage heat treatment is 8h; the eighth-stage heat treatment and the ninth-stage heat treatment are the dry-ripening period of the tobacco leaves;

[0127] When the time of the ninth stage heat treatment reaches 8h, the relative humidity is detected, and when the relative humidity drops to 12%, the ninth stage heat treatment ends, that is, the flue-cured tobacco process ends.

[0128] Comparative Example 2

[0129] In order to compare the traditional flue-cured tobacco method with the flue-cured tobacco method of Example 2, another 500 pieces of tobacco leaves selected from the 1000 pieces of tobacco leaves in Example 2 are placed in the same tobacco barn as in Example 2 for curing, and the flue-cured tobacco method of the present comparative example specifically comprises the following steps:

[0130] (1) The tobacco leaves are sequentially subjected to first stage heat treatment, second stage heat treatment, third stage heat treatment and fourth stage heat treatment, respectively. The dry bulb temperature of the first stage heat treatment is 36℃, and the wet bulb temperature is 35℃. The time of the first stage heat treatment is 2h, and the temperature rising time from room temperature to the dry bulb temperature of the first stage heat treatment is 6h. The dry bulb temperature of the second stage heat treatment is 38℃, and the wet bulb temperature is 36℃. The time of the second stage heat treatment is 36h, and the temperature rising time from the dry bulb temperature of the first stage heat treatment to the dry bulb temperature of the second stage heat treatment is 4h. The dry bulb temperature of the third stage heat treatment is 40℃, and the wet bulb temperature is 36℃. The time of the third stage heat treatment is 24h, and the temperature rising time from the dry bulb temperature of the second stage heat treatment to the dry bulb temperature of the third stage heat treatment is 4h. The dry bulb temperature of the fourth stage heat treatment is 42℃, and the wet bulb temperature is 35.5℃. The time of the third stage heat treatment is 24h, and the temperature rising time from the dry bulb temperature of the third stage heat treatment to the dry bulb temperature of the fourth stage heat treatment is 4h. The first stage heat treatment, the second stage heat treatment, the third stage heat treatment and the fourth stage heat treatment are the yellowing period of the tobacco leaves;

[0131] (2) Then the tobacco leaves are sequentially subjected to fifth stage heat treatment, sixth stage heat treatment and seventh stage heat treatment, respectively. The dry bulb temperature of the fifth stage heat treatment is 45℃, and the wet bulb temperature is 34.5℃. The time of the fifth stage heat treatment is 20h, and the temperature rising time from the dry bulb temperature of the fourth stage heat treatment to the dry bulb temperature of the fifth stage heat treatment is 6h. The dry bulb temperature of the sixth stage heat treatment is 48℃, and the wet bulb temperature is 36℃. The time of the sixth stage heat treatment is 18h, and the temperature rising time from the dry bulb temperature of the fifth stage heat treatment to the dry bulb temperature of the sixth stage heat treatment is 6h. The dry bulb temperature of the seventh stage heat treatment is 54℃, and the wet bulb temperature is 38℃. The time of the seventh stage heat treatment is 12h, and the temperature rising time from the dry bulb temperature of the sixth stage heat treatment to the dry bulb temperature of the seventh stage heat treatment is 12h. The fifth stage heat treatment, the sixth stage heat treatment and the seventh stage heat treatment are the color fixing period of the tobacco leaves;

[0132] (3) finally, the tobacco leaves are sequentially subjected to an eighth stage heat treatment and a ninth stage heat treatment, the dry-bulb temperature of the eighth stage heat treatment is 60℃, the wet-bulb temperature is 39℃, the time of the eighth stage heat treatment is 35h, the time for the dry-bulb temperature to rise from the dry-bulb temperature of the seventh stage heat treatment to the dry-bulb temperature of the eighth stage heat treatment is 8h; the dry-bulb temperature of the ninth stage heat treatment is 68℃, the wet-bulb temperature is 41℃, the time for the dry-bulb temperature to rise from the dry-bulb temperature of the eighth stage heat treatment to the dry-bulb temperature of the ninth stage heat treatment is 8h; the eighth stage heat treatment and the ninth stage heat treatment are the dry-stiffening period of the tobacco leaves;

[0133] When the time of the ninth stage heat treatment reaches 8h, the relative humidity is detected, and when the relative humidity drops to 12%, the ninth stage heat treatment ends, that is, the flue-cured tobacco process ends.

[0134] Comparative Example 3

[0135] In order to compare the traditional flue-cured tobacco method with the flue-cured tobacco method of Example 3, another 500 pieces of tobacco leaves selected from the 1000 pieces of tobacco leaves in Example 3 are placed in the same tobacco leaf curing barn as in Example 3 for curing, and the flue-cured tobacco method of the present comparative example specifically comprises the following steps:

[0136] (1) the tobacco leaves are sequentially subjected to a first stage heat treatment, a second stage heat treatment, a third stage heat treatment and a fourth stage heat treatment, the dry-bulb temperature of the first stage heat treatment is 36℃, the wet-bulb temperature is 35℃, the time of the first stage heat treatment is 2h, the time for the dry-bulb temperature to rise from room temperature to the dry-bulb temperature of the first stage heat treatment is 6h; the dry-bulb temperature of the second stage heat treatment is 38℃, the wet-bulb temperature is 36℃, the time of the second stage heat treatment is 30h, the time for the dry-bulb temperature to rise from the dry-bulb temperature of the first stage heat treatment to the dry-bulb temperature of the second stage heat treatment is 4h; the dry-bulb temperature of the third stage heat treatment is 40℃, the wet-bulb temperature is 36.5℃, the time of the third stage heat treatment is 18h, the time for the dry-bulb temperature to rise from the dry-bulb temperature of the second stage heat treatment to the dry-bulb temperature of the third stage heat treatment is 4h; the dry-bulb temperature of the fourth stage heat treatment is 42℃, the wet-bulb temperature is 37℃, the time of the third stage heat treatment is 20h, the time for the dry-bulb temperature to rise from the dry-bulb temperature of the third stage heat treatment to the dry-bulb temperature of the fourth stage heat treatment is 4h; the first stage heat treatment, the second stage heat treatment, the third stage heat treatment and the fourth stage heat treatment are the yellowing period of the tobacco leaves;

[0137] (2) then the tobacco leaves are subjected to fifth stage heat treatment, sixth stage heat treatment and seventh stage heat treatment in sequence, the dry ball temperature of the fifth stage heat treatment is 45℃, the wet ball temperature is 37℃, the time of the fifth stage heat treatment is 18h, the temperature rising time from the dry ball temperature of the fourth stage heat treatment to the dry ball temperature of the fifth stage heat treatment is 6h; the dry ball temperature of the sixth stage heat treatment is 48℃, the wet ball temperature is 37℃, the time of the sixth stage heat treatment is 18h, the temperature rising time from the dry ball temperature of the fifth stage heat treatment to the dry ball temperature of the sixth stage heat treatment is 6h; the dry ball temperature of the seventh stage heat treatment is 54℃, the wet ball temperature is 38℃, the time of the seventh stage heat treatment is 12h, the temperature rising time from the dry ball temperature of the sixth stage heat treatment to the dry ball temperature of the seventh stage heat treatment is 12h; the fifth stage heat treatment, the sixth stage heat treatment and the seventh stage heat treatment are the color fixing period of the tobacco leaves;

[0138] (3) finally the tobacco leaves are subjected to eighth stage heat treatment and ninth stage heat treatment in sequence, the dry ball temperature of the eighth stage heat treatment is 60℃, the wet ball temperature is 39℃, the time of the eighth stage heat treatment is 30h, the temperature rising time from the dry ball temperature of the seventh stage heat treatment to the dry ball temperature of the eighth stage heat treatment is 8h; the dry ball temperature of the ninth stage heat treatment is 68℃, the wet ball temperature is 41℃, the temperature rising time from the dry ball temperature of the eighth stage heat treatment to the dry ball temperature of the ninth stage heat treatment is 8h; the eighth stage heat treatment and the ninth stage heat treatment are the dry muscle period of the tobacco leaves;

[0139] when the time of the ninth stage heat treatment reaches 8h, the relative humidity is detected, when the relative humidity drops to 12%, the ninth stage heat treatment is ended, i.e. the flue-cured tobacco process is ended.

[0140] Experimental Example

[0141] In order to evaluate the curing effect of different flue-cured tobacco methods, the flue-cured tobacco prepared by each example and the comparative example is statistically analyzed to obtain the proportion of superior tobacco in the flue-cured tobacco, and the results are shown in Table 2.

[0142] Table 2 Proportion of superior tobacco in the flue-cured tobacco prepared by each example and the comparative example

[0143]

[0144]

Claims

1. A self-adaptive tuning method for tobacco curing, characterized in that, The method comprises the following steps: First, the state images of the target tobacco leaves at different baking stages are acquired, and a state change level image dataset of the target tobacco leaves is established, and then the target tobacco leaves are baked; the baking comprises preheating treatment, multi-stage temperature rising heat treatment and final heat treatment; the dry bulb temperature of the preheating treatment is 35-38.5℃, and the wet bulb temperature is 33-37.5℃; the dry bulb temperature of the final heat treatment is 67-69℃, and the wet bulb temperature is 40-42℃; the multi-stage temperature rising heat treatment comprises n temperature rising heating stages which are performed in sequence, the start of each stage of heating treatment, the dry bulb temperature, the wet bulb temperature and the time of each stage of heating treatment are determined according to the state change level of the target tobacco leaves in the baking process, and n is an integer not less than 6; the state change level of the target tobacco leaves is one or any combination of a yellowing degree level, a drying degree level and a browning degree level, and the state change level of the target tobacco leaves is determined by the following method: during the baking of the tobacco, the state of the target tobacco leaves is detected, the detected images are compared with the change level image dataset, and then the state change level of the target tobacco leaves is determined; The start of each stage of heating treatment, the dry bulb temperature of each stage of heating treatment and the time of each stage of heating treatment are determined according to the yellowing degree level, and the wet bulb temperature of each stage of heating treatment is determined according to the drying degree level and / or the browning degree level.

2. The self-adapting tobacco curing method of claim 1, wherein, The preheating treatment comprises first-stage preheating and second-stage preheating which are performed in sequence, the dry bulb temperature of the first-stage preheating is 35-38℃, the wet bulb temperature is 33-37.5℃, the time of the first-stage preheating is 6-10h, the temperature rising rate from room temperature to the dry bulb temperature of the first-stage preheating is 0.8-1.2℃ / h, the dry bulb temperature of the second-stage preheating is 37.5-38.5℃, the wet bulb temperature is 35-36.5℃, the time of the second-stage preheating is not less than 8h, and the time for the dry bulb temperature rising from the dry bulb temperature of the first-stage preheating to the dry bulb temperature of the second-stage preheating is 4-6h; the time of the final heat treatment is not less than 16h.

3. The self-adapting tobacco curing method of claim 1 or 2, wherein, The yellowing degree level comprises A, B, C, D, E, F and G, the drying degree level comprises a, b, c, d, e, f, g and i, and the browning degree level comprises I, II, III, IV, V and VI; A refers to that the tobacco leaves are 5-6% yellow, B refers to that the tobacco leaves are 7-8% yellow, C refers to that the tobacco leaves are yellow with green veins at the base, D refers to that the tobacco leaves are yellow with green veins, E refers to that the tobacco leaves are yellow with white veins, F refers to that the main veins of the tobacco leaves are partially contracted and purple, and G refers to that the main veins of the tobacco leaves are completely purple. The a level refers to that the tobacco leaves reach swelling and hardening, the b level refers to that the tobacco leaves reach softening of leaf tips, the c level refers to that the tobacco leaves reach softening of leaves, the d level refers to that the tobacco leaves reach collapse of leaves, the e level refers to that the tobacco leaves reach hooking and edge rolling of leaves, the f level refers to that 1 / 2 to 2 / 3 of the tobacco leaves become dry leaves, and the g level refers to that the tobacco leaves become dry leaves; the h level refers to that the dry degree of the main veins of the tobacco leaves reaches 45 to 55%, and the i level refers to that the main veins of the tobacco leaves become dry. The I level refers to that the area percentage of the brown part in the tobacco leaves is 0, the II level refers to that the area percentage of the brown part in the tobacco leaves is greater than 0 and not greater than 10%, the III level refers to that the area percentage of the brown part in the tobacco leaves is greater than 10% and not greater than 20%, the IV level refers to that the area percentage of the brown part in the tobacco leaves is greater than 20% and not greater than 30%, the V level refers to that the area percentage of the brown part in the tobacco leaves is greater than 30% and not greater than 50%, and the VI level refers to that the area percentage of the brown part in the tobacco leaves is greater than 50%.

4. The self-adapting tobacco curing method of claim 3, wherein, The multi-stage heat treatment includes a first-stage heat treatment, a second-stage heat treatment, a third-stage heat treatment, a fourth-stage heat treatment, a fifth-stage heat treatment and a sixth-stage heat treatment performed in sequence.

5. The self-adapting tobacco curing method of claim 4, wherein, When the time of the pre-heat treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is B level, the first-stage heat treatment is started; When the time of the first-stage heat treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is C level, the second-stage heat treatment is started; When the time of the second-stage heat treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is D level, the third-stage heat treatment is started; When the time of the third-stage heat treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is E level, the fourth-stage heat treatment is started; When the time of the fourth-stage heat treatment reaches a predetermined value and the yellowing degree of not less than 51% and less than 70% of the tobacco leaves is F level, the fifth-stage heat treatment is started; When the time of the fifth-stage heat treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is F level, the sixth-stage heat treatment is started.

6. The self-adapting tobacco curing method of claim 5, wherein, The predetermined value of the time of the pre-heat treatment is not less than 14 h, the predetermined value of the time of the first-stage heat treatment is not less than 8 h, the predetermined value of the time of the second-stage heat treatment is not less than 12 h, the predetermined value of the time of the third-stage heat treatment is not less than 8 h, the predetermined value of the time of the fourth-stage heat treatment is not less than 8 h, the predetermined value of the time of the fifth-stage heat treatment is not less than 12 h, and the time of the sixth-stage heat treatment is 5 to 7 h.

7. The self-adapting tobacco curing method of claim 4, wherein, The dry bulb temperature of the first-stage heat treatment is 39 to 41 ℃, the dry bulb temperature of the second-stage heat treatment is 41.5 to 43 ℃, the dry bulb temperature of the third-stage heat treatment is 44 to 46 ℃, the dry bulb temperature of the fourth-stage heat treatment is 47 to 49 ℃, the dry bulb temperature of the fifth-stage heat treatment is 53 to 55 ℃, and the dry bulb temperature of the sixth-stage heat treatment is 59 to 61 ℃.

8. The self-adapting tobacco curing method of claim 4, wherein, The wet bulb temperature of the first stage heating treatment is determined according to the following principles: when the time of the pre-heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is B level, if the dryness degree of the tobacco leaves is a level or b level, the wet bulb temperature of the first stage heating treatment is 34-37℃, if the dryness degree of the tobacco leaves is c level, the wet bulb temperature of the first stage heating treatment is 35-37.5℃, if the dryness degree of the tobacco leaves is d level, e level, f level, g level, h level or i level, the wet bulb temperature of the first stage heating treatment is 36-38℃; The wet bulb temperature of the second stage heating treatment is determined according to the following principles: when the time of the first stage heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is C level, if the dryness degree of the tobacco leaves is a level, b level or c level and the browning degree of the tobacco leaves is I level, the wet bulb temperature of the second stage heating treatment is 35-36.5℃, if the dryness degree of the tobacco leaves is a level, b level or c level and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet bulb temperature of the second stage heating treatment is 34-36℃; if the dryness degree of the tobacco leaves is d level and the browning degree of the tobacco leaves is I level, the wet bulb temperature of the second stage heating treatment is 36-37.5℃, if the dryness degree of the tobacco leaves is d level and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet bulb temperature of the second stage heating treatment is 35-37℃; if the dryness degree of the tobacco leaves is e level, f level, g level, h level or i level and the browning degree of the tobacco leaves is I level, the wet bulb temperature of the second stage heating treatment is 36.5-38℃, if the dryness degree of the tobacco leaves is e level, f level, g level, h level or i level and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet bulb temperature of the second stage heating treatment is 36-37.5℃; The wet ball temperature of the third stage heating treatment is determined according to the following principles: when the time of the second stage heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is D level, if the dryness degree of the tobacco leaves is a level, b level, c level or d level and the browning degree of the tobacco leaves is I level, the wet ball temperature of the third stage heating treatment is 35-37℃, if the dryness degree of the tobacco leaves is a level, b level, c level or d level and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet ball temperature of the third stage heating treatment is 34-36℃; if the dryness degree of the tobacco leaves is e level and the browning degree of the tobacco leaves is I level, the wet ball temperature of the third stage heating treatment is 36-38℃, if the dryness degree of the tobacco leaves is e level and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet ball temperature of the third stage heating treatment is 35-37℃; if the dryness degree of the tobacco leaves is f level, g level, h level or i level and the browning degree of the tobacco leaves is I level, the wet ball temperature of the third stage heating treatment is 37-38℃, if the dryness degree of the tobacco leaves is f level, g level, h level or i level and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet ball temperature of the third stage heating treatment is 36-37.5℃; The wet ball temperature of the fourth stage heating treatment is determined according to the following principles: when the time of the third stage heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is E level, if the dryness degree of the tobacco leaves is a level, b level, c level or d level and the browning degree of the tobacco leaves is I level, the wet ball temperature of the fourth stage heating treatment is 36-37℃, if the dryness degree of the tobacco leaves is a level, b level, c level or d level and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet ball temperature of the fourth stage heating treatment is 35-36℃; if the dryness degree of the tobacco leaves is e level, f level, g level, h level or i level and the browning degree of the tobacco leaves is I level, the wet ball temperature of the fourth stage heating treatment is 37-38℃, if the dryness degree of the tobacco leaves is e level, f level, g level, h level or i level and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet ball temperature of the fourth stage heating treatment is 36-37℃; The wet ball temperature of the fifth stage heating treatment is determined according to the following principle: when the time of the fourth stage heating treatment reaches a predetermined value and the yellowing degree of not less than 51% and less than 70% of the tobacco leaves is F grade, if the drying degree of the tobacco leaves is a grade, b grade, c grade, d grade or e grade and the browning degree of the tobacco leaves is I grade, the wet ball temperature of the fifth stage heating treatment is 37-38℃, if the drying degree of the tobacco leaves is a grade, b grade, c grade, d grade or e grade and the browning degree of the tobacco leaves is II grade, III grade, IV grade, V grade or VI grade, the wet ball temperature of the fifth stage heating treatment is 36-37℃; if the drying degree of the tobacco leaves is f grade, g grade, h grade or i grade and the browning degree of the tobacco leaves is I grade, the wet ball temperature of the fifth stage heating treatment is 38-39℃, if the drying degree of the tobacco leaves is f grade, g grade, h grade or i grade and the browning degree of the tobacco leaves is II grade, III grade, IV grade, V grade or VI grade, the wet ball temperature of the fifth stage heating treatment is 37-38℃; The wet ball temperature of the sixth stage heating treatment is determined according to the following principle: when the time of the fifth stage heating treatment reaches a predetermined value and the yellowing degree of more than 70% of the tobacco leaves is F grade, if the drying degree of the tobacco leaves is a grade, b grade, c grade, d grade, e grade or f grade, the wet ball temperature of the sixth stage heating treatment is 38-39℃, if the drying degree of the tobacco leaves is g grade, h grade or i grade, the wet ball temperature of the sixth stage heating treatment is 39-40℃.

9. The self-adapting tobacco curing method of claim 4, wherein, The tobacco leaves are from Henan Province, the pre-heating treatment comprises a first stage pre-heating and a second stage pre-heating which are performed in sequence, the dry ball temperature of the first stage pre-heating is 36℃, the wet ball temperature is 35℃, the time of the first stage pre-heating is 6h, the temperature rising rate from room temperature to the dry ball temperature of the first stage pre-heating is 1℃ / h, the dry ball temperature of the second stage pre-heating is 38℃, the wet ball temperature is 36.5℃, the time of the second stage pre-heating is not less than 12h, and the time from the dry ball temperature of the first stage pre-heating to the dry ball temperature of the second stage pre-heating is 4h; the multi-stage temperature rising heat treatment comprises a first stage heating treatment, a second stage heating treatment, a third stage heating treatment, a fourth stage heating treatment, a fifth stage heating treatment and a sixth stage heating treatment which are performed in sequence; the dry ball temperature of the final stage heat treatment is 68℃, the wet ball temperature is 41℃, and the time of the final stage heat treatment is not less than 16h; the time from the dry ball temperature of the sixth stage heating treatment to the dry ball temperature of the final stage heat treatment is 8h; When the time of the second-stage preheating is 12h, the state of the target tobacco leaves is detected, and when the yellowing degree of more than 70% of the tobacco leaves is B level, the first-stage heating treatment is started, the dry-bulb temperature of the first-stage heating treatment is 40℃, the time for increasing the dry-bulb temperature from the dry-bulb temperature of the second-stage preheating to the dry-bulb temperature of the first-stage heating treatment is 4h, and the time of the first-stage heating treatment is not less than 12h; when the yellowing degree of more than 70% of the tobacco leaves is B level, if the drying degree of the tobacco leaves is a level or b level, the wet-bulb temperature of the first-stage heating treatment is 36℃, if the drying degree of the tobacco leaves is c level, the wet-bulb temperature of the first-stage heating treatment is 36.5℃, and if the drying degree of the tobacco leaves is d level, e level, f level, g level, h level or i level, the wet-bulb temperature of the first-stage heating treatment is 37℃; When the time of the first-stage heating treatment is 12h, the state of the target tobacco leaves is detected, and when the yellowing degree of more than 70% of the tobacco leaves is C level, the second-stage heating treatment is started, the dry-bulb temperature of the second-stage heating treatment is 42℃, the time for increasing the dry-bulb temperature from the dry-bulb temperature of the first-stage heating treatment to the dry-bulb temperature of the second-stage heating treatment is 4h, and the time of the second-stage heating treatment is not less than 12h; when the yellowing degree of more than 70% of the tobacco leaves is C level, if the drying degree of the tobacco leaves is a level, b level or c level, and the browning degree of the tobacco leaves is I level, the wet-bulb temperature of the second-stage heating treatment is 36℃, if the drying degree of the tobacco leaves is a level, b level or c level, and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet-bulb temperature of the second-stage heating treatment is 35℃; when the yellowing degree of more than 70% of the tobacco leaves is C level, if the drying degree of the tobacco leaves is d level, and the browning degree of the tobacco leaves is I level, the wet-bulb temperature of the second-stage heating treatment is 37℃, if the drying degree of the tobacco leaves is d level, and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet-bulb temperature of the second-stage heating treatment is 36℃; when the yellowing degree of more than 70% of the tobacco leaves is C level, if the drying degree of the tobacco leaves is e level, f level, g level, h level or i level, and the browning degree of the tobacco leaves is I level, the wet-bulb temperature of the second-stage heating treatment is 37℃, and if the drying degree of the tobacco leaves is e level, f level, g level, h level or i level, and the browning degree of the tobacco leaves is II level, III level, IV level, V level or VI level, the wet-bulb temperature of the second-stage heating treatment is 36.5℃; When the time of the second stage heating treatment is 12h, the state of the target tobacco leaves is detected, and when the yellowing degree of more than 70% of the tobacco leaves is D level, the third stage heating treatment is started, the dry-bulb temperature of the third stage heating treatment is 45℃, the time for increasing the dry-bulb temperature from the dry-bulb temperature of the second stage heating treatment to the dry-bulb temperature of the third stage heating treatment is 6h, and the time of the third stage heating treatment is not less than 12h; when the yellowing degree of more than 70% of the tobacco leaves is D level, if the drying degree of the tobacco leaves is a, b, c or d level, and the browning degree of the tobacco leaves is I level, the wet-bulb temperature of the third stage heating treatment is 35.5℃, if the drying degree of the tobacco leaves is a, b, c or d level, and the browning degree of the tobacco leaves is II, III, IV, V or VI level, the wet-bulb temperature of the third stage heating treatment is 35℃; when the yellowing degree of more than 70% of the tobacco leaves is D level, if the drying degree of the tobacco leaves is e level, and the browning degree of the tobacco leaves is I level, the wet-bulb temperature of the third stage heating treatment is 36.5℃, if the drying degree of the tobacco leaves is e level, and the browning degree of the tobacco leaves is II, III, IV, V or VI level, the wet-bulb temperature of the third stage heating treatment is 36℃; when the yellowing degree of more than 70% of the tobacco leaves is D level, if the drying degree of the tobacco leaves is f, g, h or i level, and the browning degree of the tobacco leaves is I level, the wet-bulb temperature of the third stage heating treatment is 37℃, if the drying degree of the tobacco leaves is f, g, h or i level, and the browning degree of the tobacco leaves is II, III, IV, V or VI level, the wet-bulb temperature of the third stage heating treatment is 36.5℃; When the time of the third stage heating treatment is 12h, the state of the target tobacco leaves is detected, and when the yellowing degree of more than 70% of the tobacco leaves is E level, the fourth stage heating treatment is started, the dry ball temperature of the fourth stage heating treatment is 48℃, the time for increasing the dry ball temperature from the dry ball temperature of the third stage heating treatment to the dry ball temperature of the fourth stage heating treatment is 6h, and the time of the fourth stage heating treatment is not less than 12h; when the yellowing degree of more than 70% of the tobacco leaves is E level, if the drying degree of the tobacco leaves is a, b, c or d level and the browning degree of the tobacco leaves is I level, the wet ball temperature of the fourth stage heating treatment is 37℃, and if the drying degree of the tobacco leaves is a, b, c or d level and the browning degree of the tobacco leaves is II, III, IV, V or VI level, the wet ball temperature of the fourth stage heating treatment is 36℃; when the yellowing degree of more than 70% of the tobacco leaves is E level, if the drying degree of the tobacco leaves is e, f, g, h or i level and the browning degree of the tobacco leaves is I level, the wet ball temperature of the fourth stage heating treatment is 38℃, and if the drying degree of the tobacco leaves is e, f, g, h or i level and the browning degree of the tobacco leaves is II, III, IV, V or VI level, the wet ball temperature of the fourth stage heating treatment is 37℃; When the time of the fourth stage heating treatment is 12h, the state of the target tobacco leaves is detected, and when the yellowing degree of not less than 51% and less than 70% of the tobacco leaves is F level, the fifth stage heating treatment is started, the dry ball temperature of the fifth stage heating treatment is 54℃, the time for increasing the dry ball temperature from the dry ball temperature of the fourth stage heating treatment to the dry ball temperature of the fifth stage heating treatment is 10h, and the time of the fifth stage heating treatment is not less than 12h; when the yellowing degree of not less than 51% and less than 70% of the tobacco leaves is F level, if the drying degree of the tobacco leaves is a, b, c, d or e level and the browning degree of the tobacco leaves is I level, the wet ball temperature of the fifth stage heating treatment is 37.5℃, and if the drying degree of the tobacco leaves is a, b, c, d or e level and the browning degree of the tobacco leaves is II, III, IV, V or VI level, the wet ball temperature of the fifth stage heating treatment is 36.5℃; when the yellowing degree of not less than 51% and less than 70% of the tobacco leaves is F level, if the drying degree of the tobacco leaves is f, g, h or i level and the browning degree of the tobacco leaves is I level, the wet ball temperature of the fifth stage heating treatment is 38.5℃, and if the drying degree of the tobacco leaves is f, g, h or i level and the browning degree of the tobacco leaves is II, III, IV, V or VI level, the wet ball temperature of the fifth stage heating treatment is 37.5℃; When the time of the fifth stage heating treatment is 12 h, the state of the target tobacco leaves is detected, and when the yellowing degree of more than 70% of the tobacco leaves is F level, the sixth stage heating treatment is started, the dry ball temperature of the sixth stage heating treatment is 60℃, the time for increasing the dry ball temperature from the dry ball temperature of the fifth stage heating treatment to the dry ball temperature of the sixth stage heating treatment is 6 h, and the time of the sixth stage heating treatment is 6 h; when the yellowing degree of more than 70% of the tobacco leaves is F level, if the drying degree of the tobacco leaves is a level, b level, c level, d level, e level or f level, the wet ball temperature of the sixth stage heating treatment is 38℃, and if the drying degree of the tobacco leaves is g level, h level or i level, the wet ball temperature of the sixth stage heating treatment is 39℃.

Images