A tobacco curing system based on rigid airtight enclosures

Abstract

The application discloses a tobacco curing system based on rigid airtight enclosure structures, which comprises a plurality of rigid airtight enclosure structures for placing tobacco, wherein the rigid airtight enclosure structures are constructed by using thermal insulation materials; a gas station connected with the plurality of rigid airtight enclosure structures through gas inlet pipelines, wherein the gas station is used for preparing nitrogen; a temperature adjusting device arranged in the rigid airtight enclosure structures and used for adjusting the temperature in the rigid airtight enclosure structures; and a detection device comprising a controller and oxygen sensors, temperature and humidity sensors and core temperature sensors arranged in and / or outside the rigid airtight enclosure structures, wherein the oxygen sensors, temperature and humidity sensors are respectively used for detecting the oxygen content, temperature and humidity in and / or outside the rigid airtight enclosure structures. The tobacco curing system can provide a thermal insulation airtight curing environment with controllable temperature and oxygen for the tobacco.

Description

Technical Field

[0001] This application relates to the field of tobacco storage technology, and in particular to a tobacco preservation system based on a rigid airtight enclosure structure. Background Technology

[0002] Modified atmosphere storage (MAP) is an innovative method for preserving tobacco leaves. It effectively extends the shelf life of tobacco leaves, maintains their flavor and aroma, and significantly reduces the risk of pests and mold. By adjusting gas parameters in the environment, it creates an ideal storage environment for the tobacco leaves, thereby improving their quality and meeting market demand for high-quality tobacco products.

[0003] However, traditional tobacco curing systems largely rely on flexible tents, which have significant shortcomings in terms of heat preservation and temperature regulation. The structure of flexible tents lacks good thermal insulation, making temperature control during the curing process difficult and consequently affecting the curing effect. Furthermore, traditional systems typically depend on manual monitoring of environmental parameters such as temperature and humidity. This method is not only inefficient but may also lead to delayed and inaccurate results, further reducing the overall curing effectiveness. Therefore, a more advanced and efficient tobacco curing system is urgently needed to solve these problems. Utility Model Content

[0004] In view of this, embodiments of this application provide a tobacco curing system based on a rigid airtight enclosure structure to solve at least one technical problem.

[0005] This application provides a tobacco curing system based on a rigid airtight enclosure structure, comprising: multiple rigid airtight enclosure structures for placing tobacco leaves, wherein the rigid airtight enclosure structures are constructed using insulation materials and have an insulation function; a gas workstation connected to the multiple rigid airtight enclosure structures via air inlet pipes, wherein the gas workstation is used to produce nitrogen; a temperature control device disposed inside the rigid airtight enclosure structures for adjusting the temperature inside the rigid airtight enclosure structures; and a detection device including a controller, wherein the controller is electrically connected to an oxygen sensor, a temperature and humidity sensor, and a core temperature sensor disposed inside and / or outside the rigid airtight enclosure structures, wherein the oxygen sensor and the temperature and humidity sensor are used to detect the oxygen content, temperature, and humidity inside and / or outside the rigid airtight enclosure structures, and the core temperature sensor is used to detect the temperature of the tobacco leaves inside the tobacco box.

[0006] In the tobacco leaf maintenance system described above, the controller is electrically connected to the oxygen sensor, temperature and humidity sensor, and core temperature sensor via a data acquisition gateway. The data acquisition gateway is wirelessly connected to the cloud platform, and the data acquisition gateway sends the detection data to the controller and the cloud platform.

[0007] As described above, the detection device further includes: a flow meter connected to the inlet pipe of the oxygen sensor via a main line for controlling the flow rate of the pipe; and a gas delivery device connected to the inlet pipe of the flow meter via a main line for delivering gas to the flow meter. Multiple branch lines are connected to multiple rigid airtight enclosure structures via solenoid valves, and the gas delivery device delivers gas to the gas detection device.

[0008] In the tobacco leaf maintenance system described above, the diameter of both the main path and the branch path is 6mm to 10mm.

[0009] As described above, the detection device of the tobacco leaf maintenance system further includes a moisture sensor, a carbon dioxide sensor, and an ammonia sensor. The carbon dioxide sensor is used to detect the carbon dioxide content, the moisture sensor is used to detect the moisture content of the tobacco leaves inside the rigid airtight enclosure structure, and the ammonia sensor is used to detect the ammonia content. Based on one or more of the moisture content, oxygen content change value, temperature change value, carbon dioxide change value, and ammonia change value, it can be predicted whether the tobacco leaves have become moldy.

[0010] The tobacco leaf curing system described above further includes a humidity control module, which is connected to the gas outlet of the gas workstation via a pipeline. The humidity control module is used to adjust the humidity of the gas.

[0011] The tobacco leaf maintenance system described above further includes: an insect monitoring device, comprising: an insect-attracting board, including a plastic plate and a trapping core, the insect-attracting board being used to attract and capture pests for insect infestation prediction and analysis; a camera module, the camera module being installed inside the insect monitoring device, for capturing image information of the insect-attracting board; and an insect processor, electrically connected to the camera module, for identifying the types and new numbers of insects based on the image information.

[0012] As described above, the rigid airtight enclosure structure of the tobacco curing system includes: an airtight insulation board, with adjacent airtight insulation boards tightly connected, the tight connection including: tenon and mortise joints, insertion joints, and splicing; wherein, the splicing surfaces of the peripheral edges of the airtight insulation board are all sealed with sealant.

[0013] As described above, the rigid airtight enclosure structure of the tobacco curing system also includes an airtight door, which is movably connected to the airtight enclosure body. The outer edge of the airtight door is designed with a sealing strip. When the airtight door is in the closed state, the sealing strip is in airtight contact with the airtight enclosure body.

[0014] As described above, the rigid airtight enclosure structure of the tobacco curing system further includes an air inlet and an air outlet, which are positioned diagonally.

[0015] This application can solve the problem that the sealed film cover cannot keep the temperature or control the temperature, thus improving the insecticidal efficiency; and it can realize the automatic detection and control of oxygen content, temperature and humidity without human intervention. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments of this application will be briefly described below.

[0017] Figure 1 This is a schematic diagram of the structure of a tobacco leaf curing system according to an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the detection device structure according to an embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the detection device according to another embodiment of this application.

[0020] Figure 4 This is a schematic diagram of an insect monitoring device according to an embodiment of this application.

[0021] Figure 5 This is a flowchart of a method for identifying insects according to an embodiment of this application.

[0022] Figure 6 This is a schematic diagram of a rigid airtight enclosure structure according to an embodiment of this application.

[0023] Figure 7 This is a schematic diagram of a partial structure of a rigid airtight enclosure according to an embodiment of this application.

[0024] Figure 8 This is a flowchart of a tobacco leaf curing method based on a rigid airtight enclosure structure according to an embodiment of this application.

[0025] Figure 9 This is a structural diagram of a tobacco leaf curing system module based on a rigid airtight enclosure structure according to an embodiment of this application. Detailed Implementation

[0026] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0028] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0029] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the implementation methods provided in the embodiments of this application can be combined with each other without contradiction.

[0030] Controlled atmosphere (CA) curing technology for tobacco leaves primarily relies on airtight enclosure structures. These structures effectively isolate the tobacco from the external environment, ensuring the stability and controllability of internal environmental parameters. Within this closed environment, the following are the key control steps and objectives: Humidity control: Use humidifiers or dehumidifiers to adjust the ambient humidity to maintain optimal storage conditions for tobacco leaves. Appropriate humidity prevents tobacco leaves from drying out or absorbing excessive moisture, preserving their quality. Oxygen content adjustment: Create a low-oxygen environment by introducing nitrogen or other inert gases to reduce the oxygen content. A low-oxygen environment effectively kills or inhibits the growth of storage pests while slowing down the oxidation process of tobacco leaves, maintaining their freshness and aroma.

[0031] The specific functions of controlled atmosphere storage for tobacco include: Insect control: A low-oxygen environment is fatal to many pests because it deprives them of the oxygen they need to survive, thus achieving a natural insecticidal effect without chemical agents. Aging: Tobacco leaves naturally age during storage, a process that helps improve their taste and flavor. By controlling environmental parameters, this aging process can be accelerated or optimized. Aging maintenance: After aging reaches an ideal state, maintaining stable environmental parameters can preserve the aging effect of the tobacco leaves for a long time, ensuring the stability of tobacco quality. The tobacco leaf maintenance method of this application is based on a tobacco leaf maintenance system with a rigid, airtight enclosure structure.

[0032] Figure 1 This is a schematic diagram of a tobacco leaf curing system according to an embodiment of this application. Figure 1 As shown, the tobacco leaf curing system 1000 includes a gas workstation 100, multiple detection devices 200, multiple rigid airtight enclosure structures 300, a remote platform 400, and a temperature control device (not shown) installed within the rigid airtight enclosure structures. The gas workstation 100 is connected to the multiple rigid airtight enclosure structures via air inlet pipes to deliver gas to them. The detection devices 200 include an oxygen sensor, a temperature and humidity sensor, and a core temperature sensor installed inside and / or outside the rigid airtight enclosure structures. The oxygen sensor and temperature and humidity sensor are used to detect the oxygen content, temperature, and humidity inside and / or outside the rigid airtight enclosure structures. The core temperature sensor is used to detect the temperature of the tobacco leaves inside the tobacco box. The rigid airtight enclosure structure 300 is used to house the tobacco box containing the tobacco leaves.

[0033] The gas workstation 100 includes an air compressor 110, a refrigerated dryer 120, a filter module 130, a display and control box 140, and a safety protection module 150. The display and control box includes a monitoring module 141.

[0034] Air compressor 110 is the gas supply device for the gas workstation. Its main function is to draw air and compress it to the required pressure to provide a stable compressed air source for the PSA (Pressure Swing Adsorption) nitrogen generation process. Air compressor 110 typically includes one or more compression units to ensure a continuous supply of compressed air. Refrigerated dryer 120 is connected to the output of air compressor 110. Its function is to cool and dry the compressed air to remove moisture and grease, ensuring that the air entering the molecular sieve is dry and clean. Refrigerated dryer 120 reduces the humidity of the air by cooling the air to condense moisture and then draining it through a drainage system. Filter module 130 is located after refrigerated dryer 120. Its main function is to further purify the air, removing fine particulate matter and residual oil vapor. Filter module 130 typically includes multiple levels of filters to ensure that the output air meets the purity requirements of the nitrogen generation process. Filter module 130 delivers the filtered gas to a separation module (not shown), where the target gas (nitrogen or oxygen) is separated from the air. For example, the filtered gas is fed into a molecular sieve to produce nitrogen, and high-purity nitrogen (99% or 99.9%) is output after the nitrogen purity meets the process requirements.

[0035] The display and control box 140 is the central control unit of the gas workstation, including the monitoring module 141. The function of the display and control box 140 is to monitor and control the system's operating status in real time, including the operating parameters of the air compressor, refrigerated dryer, filter module, and other related equipment. The monitoring module 141 can display system operating data, such as nitrogen purity, flow rate, temperature, and humidity, and allows operators to remotely control and adjust the system.

[0036] The safety protection module 150 is a crucial component of the gas workstation, ensuring the safe operation of the system. This module includes various safety sensors and alarm devices to monitor for abnormal conditions within the system, such as excessive pressure, abnormal temperature, or nitrogen purity not meeting requirements. Upon detecting a potential safety risk, the safety protection module 150 will automatically activate protective measures, such as shutting off the gas supply and activating alarms, to prevent accidents.

[0037] The gas workstation 100, via a gas supply network module, receives nitrogen or oxygen through pneumatic valves controlled by pneumatic valves at each floor level, controlling the flow of nitrogen or oxygen into branch pipes within the warehouse. Automatic regulating valves adjacent to the rigid airtight enclosure control the entry of nitrogen or oxygen. The gas workstation 100 includes a fresh air module 160 and a humidity control module 170. The fresh air module 160 provides clean air and delivers it to any rigid airtight enclosure via the gas supply network module. The humidity control module 170, located on the gas supply network module and connected to the gas workstation's outlet, adjusts the humidity of the delivered gas, thereby regulating the humidity of the tobacco environment within the rigid airtight enclosure. The humidity control module 170 can employ isenthalpic humidity control technology, allowing for mechanical humidity control of each tobacco stack via the pipeline system.

[0038] Depending on the different stages of tobacco leaf maintenance, the gas supply network module can automatically match and deliver nitrogen purity and flow rate to meet the needs of pest control. It can also introduce filtered fresh air into the tobacco stacks through the automatic gas distribution system, thereby regulating the decrease and increase of oxygen in the stacks to meet the maintenance needs of tobacco leaf pest control and aging.

[0039] The remote platform 400 includes a cloud server 410, a gateway 420, and a terminal 430. The cloud server 410 is the core component of the remote platform 400, responsible for storing, processing, and analyzing data from the gateway 420. The cloud server 410 possesses powerful data processing capabilities, enabling it to receive real-time data on tobacco curing environment uploaded by the gateway, including temperature, humidity, and oxygen content. Furthermore, the cloud server 410 is responsible for maintaining the database and storing historical data for trend analysis and curing effect evaluation. The cloud server 410 also provides a data access interface, allowing the terminal 430 to remotely access and control the curing system via the internet. The cloud server 410 performs statistical analysis on data sent by one or more of the following sensors: temperature and humidity sensor, core temperature sensor, oxygen sensor, carbon dioxide sensor, moisture sensor, ammonia sensor, and formaldehyde sensor, to obtain trends in environmental parameters and risk prediction results, thereby providing a basis for decision-making in the control of the curing process.

[0040] Gateway 420 acts as a data transmission relay station, wirelessly connecting to the display and control box 140 and the detection device 200 to receive data from these devices. Gateway 420 employs wireless communication technologies (such as LoRa, Wi-Fi, or cellular networks) to ensure stable data transmission. The main functions of gateway 420 include: Data collection: periodically collecting environmental and equipment detection data from the display and control box 140 and the detection device 200. Data preprocessing: performing preliminary processing on the collected data, such as format conversion and data compression. Data upload: uploading the preprocessed data to the cloud server 410 via a wireless network.

[0041] Terminal 430 can be any device that can access cloud server 410, such as a smartphone, tablet, or computer. Terminal 430 wirelessly connects to cloud server 410 via the internet and has the following functions: Real-time monitoring: Users can view various parameters of the tobacco curing environment in real time through terminal 430, such as temperature, humidity, and oxygen content. Alarm notification: When abnormal environmental parameters are detected, cloud server 410 will send an alarm notification to terminal 430 to remind the user to take appropriate measures. Remote control: Users can remotely control display and control box 140 and detection device 200 through terminal 430, such as adjusting nitrogen flow and setting environmental parameter thresholds. Data analysis: Terminal 430 can access historical data stored on cloud server 410 for data analysis and curing effect evaluation.

[0042] A rigid airtight enclosure structure (warehouse) is a warehouse constructed using rigid insulation materials and a structural framework. It provides insulation, seals the tobacco leaves, and offers high airtightness. Through an automated pipeline system, it can rapidly reduce oxygen levels and regulate temperature and humidity for pest control, and can also adjust atmospheric parameters such as oxygen content, temperature, and humidity in real time according to the needs of tobacco aging. Multiple tobacco stacks are placed within the rigid airtight enclosure structure, each stack consisting of multiple tobacco boxes filled with tobacco leaves.

[0043] refer to Figure 1 The warehouse consists of five floors, each capable of storing 20,000 cartons of tobacco. Each floor is divided into two rigid, airtight enclosure structures, each with a capacity of approximately 5,000 cartons. Assuming 250 cartons of tobacco per stack, the estimated number of stacks within each rigid, airtight enclosure structure is 20. One gas workstation (100 units) can meet the diverse processing needs of 100,000 cartons of tobacco. Therefore, the system includes one gas workstation (100 units), five detection devices (200 units), and supply and exhaust pipelines and valves to control oxygen content within each stack and to monitor oxygen, temperature, and humidity in real-time. The gas workstation (100 units) is preferably a skid-mounted low-oxygen gas workstation. This skid-mounted low-oxygen gas workstation uses a PSA (Pressure Swing Adsorption) process to produce high-purity nitrogen, providing a nitrogen source for nitrogen-filled pest control and capable of nitrogen-filled oxygen-reducing operations at multiple tobacco stacks. The skid-mounted low-oxygen gas workstation produces approximately 150 Nm³ / h (99% purity) and 90 Nm³ / h (99.9% purity).

[0044] The tobacco leaf preservation system proposed in this application conforms to the development trend of "green and efficient, intelligent and controllable, and information traceable" tobacco leaf storage and preservation. It realizes the transformation from "simple insect and mold prevention" to "accelerated aging and sensory quality assurance" in tobacco leaf storage. Its advantages are mainly reflected in the following aspects: Rapid and automatic oxygen reduction: Enables automatic detection and regulation of oxygen content without human intervention; Temperature control is achieved: This solves the problem that the sealed film cover cannot keep or control the temperature, thus improving the insecticidal efficiency; Reusable: One-time construction, long-term use, effectively solving the problems of easy damage to membrane covers, the need for regular replacement, and the drawbacks of high replacement costs and high safety risks; Increase storage capacity: Increase warehouse loading capacity by 30% to 40%; Shorten insecticidal time: The oxygen content can be reduced to below 0.5%, and temperature control can be used to achieve rapid insecticidal effect, reduce the impact of low oxygen controlled insecticidal effect on tobacco quality, and shorten the insecticidal cycle of tobacco leaves. Increase the rate of tobacco aging: After the pest control ends, the system automatically restores to normal oxygen levels as needed, and can even be enriched with oxygen as needed to increase the rate of tobacco aging.

[0045] Preserving tobacco quality: To achieve the best aging effect, a low-oxygen environment (such as controlling the oxygen content at 6% to 10%) can be created for tobacco leaves to prevent insect and mold growth, carbonization, and oil seepage.

[0046] Increased efficiency: Improves the efficiency of tobacco leaf entry and exit and storage management, makes the process traceable and controllable, and shortens the warehouse construction / renovation cycle.

[0047] Figure 2 This is a schematic diagram of a detection device according to an embodiment of this application. As shown, the detection device 200 includes: a controller 210, a data acquisition gateway 220, a display module 230, a multi-functional sensor 240, and a core-type temperature sensor 250. The display module 230 and the data acquisition gateway 220 are electrically connected to the controller 210. The controller 210 can be a microcontroller, and the data acquisition gateway communicates using the RS485 protocol. The data acquisition gateway 220 can also transmit the acquired data to a cloud platform via Wi-Fi, 4G, or 5G. Terminal devices, such as PCs or mobile devices, can then view the data on the cloud platform.

[0048] The detection device 200 also includes: a multi-function sensor 240, a core-type temperature sensor 250, and a moisture sensor (not shown). The multi-function sensor 240 is installed in the rigid airtight enclosure structure to detect environmental parameters within the structure. The multi-function sensor 240 integrates one or more of a temperature and humidity sensor, a carbon dioxide sensor, an ammonia sensor, and a formaldehyde sensor to detect temperature, humidity, carbon dioxide content, ammonia content, and formaldehyde content within the rigid airtight enclosure structure. The multi-function sensor 240 can transmit the detection data to the acquisition gateway 220 via LoRa wireless communication.

[0049] The core temperature sensor 250 and the moisture sensor are installed in the tobacco leaf to detect the temperature and moisture content (moisture content) in the tobacco leaf, respectively. The core temperature sensor 250 and the moisture sensor can transmit the detection data to the acquisition gateway 220 via LoRa wireless communication.

[0050] The all-in-one sensor 240, core-type temperature sensor 250, and moisture sensor transmit detection data wirelessly, eliminating the need for complex wiring. They can be easily installed anywhere in the warehouse, including areas difficult to wire or maintain. This provides significant flexibility in sensor deployment. Furthermore, the all-in-one sensor 240 integrates multiple functions, reducing the number of devices and improving system integration and efficiency.

[0051] When installing the multi-functional sensor 240 and the core-wrapped temperature sensor 250 within a rigid, airtight enclosure structure, the placement requirements are as follows: Installation height: The sensor should be installed at a height of 1m or more.

[0052] Deployment location: The deployment point should be located close to the intelligent multi-point detection platform equipment (detection device) to ensure the shortest straight-line distance and as far away as possible from the nitrogen inlet.

[0053] Deployment path: When deploying, avoid paths with metal obstructions in a straight line with the intelligent multi-point monitoring platform equipment.

[0054] After the deployment is completed, the LORA communication channels of the sensors and intelligent multi-point detection equipment are set up so that the temperature and humidity and core temperature inside the tobacco stack can be transmitted from each sensor to the intelligent multi-point detection equipment via wireless LORA communication. The intelligent multi-point detection equipment PLC (controller 210) processes the data and transmits it to the cloud server via wireless communication. Finally, the data can be viewed remotely on a PC terminal or mobile communication terminal for monitoring and guiding nitrogen filling and oxygen reduction work, so as to realize information-based, automated and intelligent management.

[0055] During the pest control period, the intelligent multi-point monitoring system can monitor the oxygen content, temperature, and humidity of the environment inside the rigid airtight enclosure structure and each tobacco stack. The data is fed back to the system. During the pest control stage, the system automatically determines and adjusts the nitrogen purity output and adjusts the regulating valve in front of the stack in real time to match the appropriate gas volume. During the aging stage, the system automatically determines and restores the oxygen in the stack to a normal oxygen state, and adjusts atmospheric parameters such as temperature and humidity to achieve full monitoring of the pest control and aging process, enabling traceability management.

[0056] However, when a multi-sensor 240 is installed in each rigid airtight enclosure structure, inconsistencies in the detection standards of one of the sensors can lead to inaccurate detection, especially inaccurate oxygen detection, which will seriously affect the safety of controlled atmosphere maintenance of tobacco leaves. To solve the above problems, this application utilizes a single oxygen sensor to detect the oxygen content in multiple rigid airtight enclosure structures, thereby unifying the monitoring standards and achieving accurate oxygen content detection.

[0057] Figure 3 This is a schematic diagram of the detection device structure according to another embodiment of this application. Figure 3 As shown, the detection device 200 includes: a controller 210, a display module 230, an oxygen sensor 260, a flow meter 270, a gas delivery device 280, and a solenoid valve 290. The oxygen sensor 260 is electrically connected to the controller 210 and sends a detection signal to the controller 210. The flow meter 270 is connected to the inlet pipe of the oxygen sensor 260 via a main line to control the flow rate. The gas delivery device 280 includes a gas sampling pump, which is connected to the inlet pipe of the flow meter 270 via a main line to deliver gas to the flow meter. The inlet of the gas delivery device 280 is connected to multiple rigid airtight enclosure structures via multiple branch lines through the solenoid valve 290, and the gas delivery device delivers gas to the gas detection device.

[0058] According to one embodiment of this application, the diameters of both the main path and the branch path are 6mm-10mm. This smaller diameter helps to reduce the impact on the internal pressure and gas composition when extracting test gas within a rigid airtight enclosure structure, ensuring the accuracy of the test and the stability of the internal environment.

[0059] According to one embodiment of this application, the tobacco leaf curing system also includes an insect infestation monitoring device. This device is a key component of the tobacco leaf curing system, used to monitor insect pest conditions within the rigid, airtight enclosure structure so that appropriate control measures can be taken promptly. This device ensures that the tobacco leaves are protected from insect infestation during the sealed curing process, maintaining the quality and safety of the tobacco leaves.

[0060] Figure 4 This is a schematic diagram of an insect infestation monitoring device according to an embodiment of this application. Figure 4 As shown, the insect monitoring device includes: an insect processor 510, a camera module 520, an insect-attracting board 530, a lighting module 540, a display module 550, and a power supply module 560. The camera module 520, the lighting module 540, the display module 550, and the power supply module 560 are electrically connected to the insect processor 510.

[0061] The insect pest processor 510, as the core control unit of the entire monitoring device, is used to coordinate and process insect pest data. The images captured by the camera module 520, the light source provided by the lighting module 540, and the working status of the insect-attracting board 530 are all controlled by the insect pest processor 510. After receiving image information from the camera module 520, the insect pest processor 510 uses regional convolutional neural network training technology to identify the types and new numbers of insects in the image information. If insect pest information is detected, and it is within the warning range, the pest information will be recorded; if it exceeds the warning value, such as the number of insects exceeding a preset insect number threshold, an alert will be issued. Furthermore, the insect pest processor generates an insect pest report based on historical information data and predicts future insect pest trends. The insect pest processor can also perform insect pest statistics, analysis, and early warning, as well as image storage and transmission.

[0062] The camera module 520 is installed inside the insect monitoring device (which is installed within the tobacco storage space, such as a rigid airtight enclosure structure) and is responsible for capturing images of the environment within the rigid airtight enclosure structure to monitor insect activity in real time. The camera module 520 can capture image information placed on the insect-attracting board 530 and send the image information to the insect processor 510 for processing. The camera module 520 can be a high-definition camera, capable of clearly identifying the type, quantity, and activity status of insects.

[0063] The insect-attracting board 530 includes a plastic sheet and a trapping core. The board is used to attract and capture pests for pest infestation prediction and analysis. It is placed in a specific location within a rigid, airtight enclosure structure for centralized monitoring of insect activity. The board 530 attracts insects by scent or light, facilitating recording and monitoring by the camera module 520.

[0064] The lighting module 540 is located near the camera module 520 to provide illumination for the camera module 520, ensuring clear capture of insect infestation images even in low-light or no-light conditions. The lighting module 540 can be turned on and off according to the instructions of the insect processor 510 to save energy and also ensure that it does not disturb the environment inside the rigid airtight enclosure structure.

[0065] Display module 550 provides a visual interface for users to view monitoring results. These results can include monitoring location and insect count, as well as analytical data or alarm information. When abnormal pest infestation is detected, display module 550 will display alarm information in real time so that corresponding measures can be taken promptly.

[0066] The power supply module 560 provides power to the entire insect monitoring device, ensuring the system's continuous and stable operation. This module can be powered by batteries or connected to an external power source, depending on actual needs, and no restrictions are specified here.

[0067] Figure 5This is a flowchart of a method for identifying insects according to an embodiment of this application. Figure 5 As shown, the method includes: S610 segments and filters image data to identify multiple candidate regions; S620, Extract deep features of each candidate region, the deep features including the shape and texture of the insect; S630 inputs deep features into the classifier to determine the types and numbers of insects in the candidate regions.

[0068] Step S610 includes preprocessing the acquired image data to improve image quality, remove noise, and divide the image into different regions using image segmentation techniques. During this process, edge detection, thresholding, or other algorithms may be used to separate different objects in the image. The purpose of image segmentation is to filter out candidate regions that may contain insects; these regions have different shape, color, or texture features that can be further analyzed.

[0069] In step S620, after selecting multiple candidate regions, the pest processor extracts features from each candidate region. The extracted features include the insect's shape, texture, and other identifiable deep features. Shape features may include the insect's outline, edges, and size, while texture features include surface roughness, repetition patterns, or color gradients. These deep features can be effectively extracted using deep neural networks (such as convolutional neural networks, CNNs) or other machine learning techniques for further pest classification.

[0070] In step S630, the extracted deep features are used as input to a pre-trained classifier for analysis. The classifier can be a model based on machine learning or artificial intelligence, capable of determining the presence of insects in candidate regions based on the input feature data. If present, it can further identify the type and quantity of insects. This classifier, after training, can identify different types of pests, such as common tobacco pests, by classifying and counting them by comparing them with a feature database of known pests. Finally, the identification results are transmitted to the display module and presented to the user.

[0071] This method automates the entire process of image segmentation, deep feature extraction, and classification, achieving accurate detection and classification of insect infestations without manual intervention, significantly improving the efficiency of pest monitoring. Deep feature extraction can identify subtle insect morphological and textural information, enabling the effective identification of even tiny or concealed insects, thus improving detection accuracy. The classifier accurately identifies the type and quantity of insects, allowing for the classification and treatment of different types of pests. This helps the system adopt different response measures under different pest conditions, effectively ensuring pest control in the tobacco cultivation environment.

[0072] According to one embodiment of this application, a rigid airtight enclosure structure is provided for use in tobacco curing environments, providing insulation, airtightness, and structural support. The rigid airtight enclosure structure includes an airtight enclosure body and multiple layers of supports. The components are assembled using a specific connection method to ensure the stability and airtightness of the overall structure.

[0073] In one embodiment, the airtight enclosure body is composed of several airtight insulation panels, and adjacent airtight insulation panels are tightly connected, specifically by tenon and mortise joints, plug-in joints or splicing, to ensure the stability and airtightness of the overall structure.

[0074] Figure 6 This is a schematic diagram of a rigid airtight enclosure structure according to an embodiment of this application. Figure 6 As shown, the rigid airtight enclosure structure 300 includes: an airtight enclosure body 310 and a multi-layer support (not shown).

[0075] The airtight enclosure 310 is a three-dimensional enclosed space formed by splicing together multiple insulation panels 311. The insulation panels 311 are made of materials with good thermal insulation properties, such as polyurethane boards, expanded polystyrene (EPS) boards, or extruded polystyrene (XPS) boards, with a thickness typically ranging from 20 to 50 mm, adjusted according to the insulation requirements of the environment. The insulation panels 311 are spliced ​​together using rivets or screws. This riveting method ensures a tight connection between the insulation panels and the frame, preventing loosening due to structural vibration or thermal expansion and contraction, thus maintaining a good sealing effect.

[0076] The gaps between adjacent insulation boards 311, as well as the gaps between the insulation board and the bottom structure, are sealed with sealant. The sealant used is waterproof sealant or silicone sealant, ensuring the airtightness and waterproof performance of the seal, thereby preventing the infiltration of air or moisture and maintaining the stability of the internal environment.

[0077] like Figure 7 As shown, to achieve efficient assembly and excellent airtightness between the various panels, positioning grooves 320 are provided at the connection points between the bottom and the facade and / or between the facade and the top surface of the airtight enclosure body 310. The top insulation panel 311 and the facade insulation panel 311 are interlocked through the positioning grooves 320. The positioning grooves 320 are not simple planar contacts, but are designed with a stepped or concave-convex fit structure.

[0078] Furthermore, to further enhance airtightness, a sealing gasket 321 is installed within the internal space of the positioning groove 320. The sealing gasket 321 is preferably made of an elastic sealing material (such as EPDM rubber, silicone strips, or foam sealing strips). When the facade insulation board 311 is inserted into the positioning groove 320 of the top insulation board 311 and tightened, the rigid compression of the two boards forces the sealing gasket 321 to undergo elastic deformation, thereby tightly filling the gap in the positioning groove. This method of in-groove compression effectively blocks airflow channels, prevents gas exchange between the inside and outside of the warehouse, and ensures that the warehouse maintains a high standard of airtightness.

[0079] In addition to connecting itself using the positioning groove 320, the bottom and facade, as well as the facade and top of the airtight enclosure body 310, can be further secured using specialized profiles (such as aluminum alloy or stainless steel angle brackets, U-shaped channel steel) or fasteners (such as through bolts, self-tapping screws). This, together with the positioning groove 320, forms a dual connection system of internal insertion and external locking.

[0080] For specific areas within the warehouse where equipment (such as fans, sensors, and lighting fixtures) needs to be installed, embedded iron (pre-embedded steel plates) or internal reinforcing beams are pre-installed during the insulation board manufacturing or installation phase. These embedded components, integrated with the insulation board, effectively distribute the concentrated load generated by the suspended equipment, preventing the insulation board from deforming or cracking due to long-term stress, thereby ensuring the long-term structural safety and functional stability of the airtight warehouse.

[0081] Optionally, for airtight enclosure structures with large spans or overall areas, a keel frame (not shown) is installed on the outer top (e.g., the airtight section). The keel frame consists of multiple external horizontal and vertical beams connected and supported at intervals, with a spacing of 5m to 10m between the beams and longitudinal beams. The insulation board on the top of the airtight enclosure is connected and fixed to the horizontal and vertical beams via a suspension system. This keel frame design gives the entire airtight enclosure structure higher load-bearing capacity and stability, while enhancing its resistance to deformation while maintaining airtightness. This design ensures reliable sealing performance and structural strength even in large-space conditions, making it suitable for long-term operation scenarios such as tobacco curing.

[0082] The keel frame is the basic skeleton of the rigid, airtight enclosure structure, responsible for supporting the weight of the entire structure and providing a rigid framework. The crossbeams and longitudinal beams within the keel frame are rigidly connected to form a robust frame structure. The crossbeams and longitudinal beams can be made of high-strength metal materials (such as steel or aluminum alloy) to ensure the overall strength and stability of the structure. The crossbeams and longitudinal beams are rigidly fixed together using welding or bolting. This connection method ensures that the frame will not deform or loosen under high load conditions, thus maintaining good rigid support. The spacing of the crossbeams and longitudinal beams can be adjusted according to specific design requirements based on the needs of the tobacco storage area.

[0083] According to one embodiment of this application, the bottom structure is a regular ground surface, and the keel frame is directly set on this ground, forming a five-sided airtight enclosure structure together with the side walls and the top slab. This method is simple to construct and suitable for occasions with low requirements for ground insulation and load-bearing capacity, enabling the warehouse to be built in a short time. According to another embodiment of this application, the bottom structure includes an insulation board, a concrete layer, and a waterproof layer located below the horizontal plane. Gaps between adjacent insulation boards and between the insulation board and the ground are sealed with sealant to ensure the overall airtightness of the insulation layer. A concrete layer is poured on top of the insulation board, providing not only load-bearing capacity but also ensuring the overall flatness of the ground. A waterproof layer is then applied to the surface of the concrete layer to prevent moisture penetration, further improving airtightness and durability. This structure is suitable for warehouses with large spans and high load-bearing requirements.

[0084] According to another embodiment of this application, the bottom structure includes insulation boards laid directly on the ground. Gaps between adjacent insulation boards are sealed with sealant to ensure the airtightness and insulation of the ground. Reinforcing steel plates or load-bearing plates are installed at the warehouse entrance area to withstand repeated pressure from vehicles or equipment. This structure meets the needs of fully automated operation while also ensuring both insulation and airtightness.

[0085] Through the different bottom structure designs described above, this application can flexibly select appropriate construction methods according to different application scenarios to achieve a comprehensive balance between airtightness, thermal insulation, and structural strength. According to one embodiment of this application, adhesive layers are provided for the inner and outer gaps between adjacent insulation boards, as well as the inner and outer gaps between the insulation board and the ground. These adhesive layers are used to fill the gaps. During installation, gaps may remain between the insulation boards, which may occur due to installation errors, material shrinkage, or thermal expansion and contraction. To avoid the impact of these gaps on airtightness and thermal insulation performance, adhesive layers are provided at the inner and outer gaps of adjacent insulation boards. Gaps may also exist at the contact surface between the insulation board and the ground, which can easily become channels for air infiltration, affecting the stability of the internal environment. Therefore, adhesive layers are also provided for the inner and outer gaps between the insulation board and the ground to fill and seal these gaps. In this way, good sealing is maintained when the insulation board or ground undergoes minor deformation, protecting the internal tobacco storage environment.

[0086] A multi-layered support structure is installed inside the airtight enclosure for storing tobacco leaves. The structure is designed with multiple layers to accommodate tobacco leaves of varying sizes, with adjustable height and width for each layer. Made of stainless steel or high-strength alloy steel, the support boasts excellent load-bearing capacity and corrosion resistance, maintaining structural stability over extended periods and remaining unaffected by moisture or corrosive gases in the tobacco curing environment. The number of layers can be customized based on storage space and requirements, with each layer spaced 0.5–1 meter apart to ensure safe placement and easy handling of the tobacco leaves. Each layer is connected by bolts or clips for convenient installation and disassembly.

[0087] According to one embodiment of this application, the surface of the insulation board is provided with a waterproof coating to enhance its moisture-proof performance. The waterproof coating covers the outer surface of the insulation board, effectively preventing moisture and humidity from penetrating its internal structure. The coating material can be waterproof polyurethane coating, acrylic waterproof coating, or fluorocarbon coating. These materials have excellent waterproof performance and weather resistance, not only preventing rainwater or moisture penetration but also improving the durability of the insulation board. Depending on the waterproofing requirements, the thickness of the waterproof coating is typically between 0.5 and 2 mm to ensure sufficient protection without affecting the weight and overall structural performance of the insulation board.

[0088] The waterproof coating effectively prevents external moisture from penetrating into the insulation board, preventing it from absorbing water, swelling, and losing its insulation effect due to humid environments. This design is particularly suitable for the high-humidity environment of tobacco cultivation, ensuring that the insulation board maintains stable heat insulation performance over a long period. By applying a waterproof coating to the surface of the insulation board, the erosion of the insulation material by moisture, pollutants, acid and alkaline gases in the external environment can be effectively reduced, extending the service life of the insulation board. At the same time, the waterproof coating has excellent weather resistance, resisting the effects of harsh climatic conditions such as ultraviolet radiation and temperature changes.

[0089] According to one embodiment of this application, the rigid airtight warehouse has a length of 20-30m and a height of 8-15m. The length range of 20-30m provides ample storage space for storing large quantities of tobacco leaves. The length can be adjusted within this range to accommodate different layout schemes or equipment requirements, depending on the specific usage needs and site conditions. The height of 8-15m ensures sufficient vertical space for storing tobacco leaves on multi-layered supports. This height flexibility allows for different numbers of layers to be installed according to actual needs, improving storage efficiency. Simultaneously, the height design also considers the requirements for airflow circulation and temperature and humidity control, ensuring the uniformity and stability of the environment within the warehouse.

[0090] According to one embodiment of this application, the support includes a support body and multiple trays. The trays are mounted on the support body via adjustable support rods, which are adjustable according to the storage height of the tobacco leaves. The trays have a mesh structure to ensure uniform airflow around the tobacco leaves. The support rods are key components connecting the trays to the support body and are height-adjustable. One end of the support rod is fixedly connected to the support body, and the other end is connected to the tray. The length of the support rod can be adjusted according to the required storage height of the tobacco leaves to accommodate different types or quantities of tobacco leaves. The support rods typically employ adjustment structures such as threaded adjustment, pin holes, or sliding snap-fit ​​mechanisms, allowing users to quickly adjust the height of the trays as needed. During adjustment, the support rods are securely fixed, ensuring that the trays do not move or tilt after adjustment.

[0091] refer to Figure 6 The rigid airtight enclosure structure 300 also includes an airtight door 330, which is movably connected to the airtight enclosure body 310. The edge of the airtight door 330 is equipped with a sealing strip, which fits tightly against the insulation board. The airtight door 330 is connected to the airtight enclosure body 310 via hinges or other movable connections to ensure stability when opening and closing. The airtight door is typically made of high-strength materials (such as metal or composite panels), and the interior of the door may be filled with insulation material to ensure the same insulation performance as the overall enclosure structure.

[0092] Airtight doors are equipped with sealing strips along their edges. These strips are typically made of rubber, silicone, or other materials with good elasticity and airtightness. The sealing strips are designed to fit tightly against the insulation panel, ensuring that air from inside or outside the building envelope does not seep through the door gaps when the door is closed. The sealing strips can be U-shaped or L-shaped to fit the door's edge and conform closely to the insulation panel. When the sealing strip is L-shaped, it includes both vertical and horizontal sections. The horizontal section is fixed to the edge of the airtight door, while the vertical section is positioned on the outside. The sealing strips can be fixed to the edge of the airtight door by embedding or adhesive bonding, ensuring they do not shift or detach during opening and closing.

[0093] According to another embodiment of this application, an inflatable sealing strip is provided on the edge of the sealed door. When the inflatable sealing strip comes into contact with the insulation board, it inflates and expands to achieve a tight fit. The inflatable sealing strip is an inflatable component installed on the edge of the sealed door, typically made of elastic rubber material, possessing good expansion performance and durability. Its internal cavity structure allows it to be inflated by an external air source, causing the sealing strip to expand and fit tightly against the insulation board, forming an effective airtight seal. The inflatable sealing strip is connected to an air pump or compressed air system. When the sealed door is closed, the system inflates the sealing strip with air through an inflation device, causing it to expand; when the sealed door needs to be opened, the system releases the gas inside the sealing strip, restoring it to its initial state, facilitating flexible opening of the door. Compared to traditional sealing strips, the inflatable sealing strip can fill the door gaps through inflation and expansion, ensuring a seamless fit and significantly improving the airtightness of the enclosure structure. This is particularly beneficial for industries requiring a stable environment, such as tobacco leaf cultivation, effectively preventing the intrusion of external air and moisture, and maintaining a stable environment within the warehouse.

[0094] According to one embodiment of this application, the rigid airtight enclosure structure further includes an air inlet and an air outlet (not shown), which are diagonally positioned. The air inlet and outlet can be rapid inlets and outlets, respectively, facilitating the rapid establishment and maintenance of a low-oxygen environment. The air inlet serves as a channel for fresh air to enter the enclosure structure, and its design location is typically below or to the side of one end of the structure, used to introduce treated fresh air from outside into the warehouse. The size and number of air inlets can be adjusted according to the internal volume and ventilation requirements of the structure to ensure sufficient airflow. Air inlets are typically equipped with filters or airflow control valves to ensure the cleanliness of the air entering the warehouse and to allow for adjustment of airflow as needed. The filters effectively block dust, impurities, and external pollutants, ensuring that the air entering the enclosure structure does not affect the quality of the internal environment.

[0095] Air vents are channels used to expel air from the storage room. They are typically located above or to the side of the opposite diagonal end of the enclosure structure, forming a circulation path with the air inlets. The placement of the air vents allows air within the enclosure structure to be expelled naturally or mechanically, carrying away excess moisture, heat, or other gases detrimental to tobacco leaf preservation. The diagonal arrangement of the air inlets and outlets maximizes the efficiency of air circulation within the storage room. This diagonal layout allows incoming air to be drawn in from the lower part of one end of the storage room, while treated air is expelled from the upper part of the other end, ensuring uniform airflow throughout the space and reducing the existence of dead zones.

[0096] The diversity of tobacco leaves is their essential characteristic, encompassing different varieties, origins, production years, and grades. This diversity is not only reflected in differences in appearance but also extends to the complexity of their internal chemical composition. If a uniform maintenance plan is applied to all types of tobacco leaves during the cultivation process, it will inevitably lead to inconsistent maintenance quality, resulting in a series of problems such as pests, mold, or insufficient aging. To address this issue, this application proposes an innovative solution: by meticulously cultivating and monitoring different types of tobacco leaves in real time, a personalized tobacco leaf cultivation method has been established. This method ensures the safety and stability of tobacco leaves during the cultivation process while optimizing their aging time to maximize the improvement of tobacco leaf quality.

[0097] Figure 8 This is a flowchart of a tobacco leaf curing method based on a rigid airtight enclosure structure according to an embodiment of this application. Figure 8 As shown, the method includes: S810, Based on the production year, origin and grade information of the tobacco leaves inside the rigid airtight enclosure structure, a maintenance plan is generated, wherein the maintenance plan includes at least the oxygen content, temperature and humidity parameters inside the rigid airtight enclosure structure. S820, according to the maintenance plan, by adjusting the nitrogen concentration and humidity delivered to the rigid airtight enclosure structure by the gas workstation, the oxygen content in the rigid airtight enclosure structure is adjusted to the first oxygen content threshold and the first humidity threshold, and the temperature in the rigid airtight enclosure structure is adjusted to the first temperature threshold and maintained at the first time threshold by the temperature control device. S830, when the first time threshold is reached, the oxygen content in the rigid airtight enclosure is adjusted to the second oxygen content threshold and the second humidity threshold by adjusting the nitrogen concentration and humidity delivered to the rigid airtight enclosure by the gas workstation, and the temperature in the rigid airtight enclosure is adjusted to the second temperature threshold and maintained at the second time threshold by the temperature control device. S840, when the second time threshold is reached, the oxygen content in the rigid airtight enclosure is adjusted to the third oxygen content threshold and the third humidity threshold by adjusting the nitrogen concentration and humidity delivered to the rigid airtight enclosure by the gas workstation, and the temperature in the rigid airtight enclosure is adjusted to the third temperature threshold by the temperature control device.

[0098] In step S810, for the maintenance process of tobacco leaves within a rigid airtight enclosure structure, a personalized maintenance plan is generated by analyzing the production year, origin, and grade information of the tobacco leaves. This plan aims to address the complexity of tobacco leaves and provide a simpler and more practical maintenance solution. Specifically, the production year reflects the maturity and freshness of the tobacco leaves, affecting their storage requirements; the origin reflects how different regional climate conditions and soil types may affect the characteristics of the tobacco leaves, thus influencing their maintenance requirements; and the grade information reflects the quality grade of the tobacco leaves, determining their specific needs during storage.

[0099] In step S820, the main task is to eliminate pests within the tobacco leaves. This involves reducing the oxygen content to a first oxygen content threshold to create an environment unfavorable to insect survival; adjusting the temperature within the rigid airtight enclosure to a first temperature threshold, typically set at the critical temperature for pest growth, to enhance the insecticidal effect; and regulating humidity to an appropriate level to prevent pest breeding while ensuring the tobacco leaves do not mold due to excessive moisture. This method can quickly reduce the oxygen content within the rigid airtight enclosure to below 0.5%, shortening the pest control time to 20 days.

[0100] In step S830, after pest control is completed, the stacking status is switched to aging status via a program, that is, the oxygen content of the stacking is slowly restored. The task at this time is to improve the taste and aroma of the tobacco leaves. The oxygen content is adjusted to the second oxygen content threshold to promote the natural aging process of the tobacco leaves; the temperature inside the enclosure structure is adjusted to the second temperature threshold using a temperature control device (such as an air conditioner), which is usually set to the optimal temperature for promoting aging; the humidity is adjusted to the second humidity threshold to ensure moderate humidity, which prevents excessive dryness and accelerates aging.

[0101] According to one embodiment of this application, the second temperature threshold is determined based on the effective accumulated temperature of the tobacco leaves. The effective accumulated temperature is the sum of the ambient temperature exceeding the biological activity threshold temperature over a cumulative period, serving as a reference indicator characterizing the degree of aging during the tobacco leaf curing process. The determination of the second temperature threshold based on the effective accumulated temperature includes: Pre-set the target effective accumulated temperature and the corresponding second time threshold for characterizing the degree of alcoholysis; The ambient temperature to be maintained during the alcoholization stage is determined based on the correspondence between the effective accumulated temperature and the second time threshold, and this ambient temperature is determined as the second temperature threshold. During the oxidation process, when the accumulated effective temperature deviates from the target effective temperature, a closed-loop correction is performed on the second temperature threshold according to the deviation magnitude, and the second temperature threshold is constrained by the upper temperature limit and the lower temperature limit.

[0102] As mentioned above, the target effective accumulated temperature can be a fixed value or a target range, with a corresponding target aging time set simultaneously. Effective accumulated temperature refers to the total heat generated within a cumulative time period when the ambient temperature exceeds the biological activity threshold temperature. Its calculation formula is: Effective accumulated temperature = ∑ (ambient temperature - biological activity threshold temperature) × cumulative number of days; The biological activity threshold temperature is typically taken as 15℃, representing the minimum temperature required for tobacco leaves to undergo aging. This formula comprehensively reflects the heat accumulation experienced by tobacco leaves during the curing process.

[0103] For example, in a certain maintenance cycle, if the ambient temperature inside the rigid airtight enclosure is 25℃ and maintained for 10 days, and then adjusted to 28℃ and maintained for 5 days, the effective accumulated temperature is: (25-15)×10+(28-15)×5=100+65=165℃·day. The system uses this effective accumulated temperature of 165℃·day as an important indicator for measuring the degree of aging of tobacco leaves.

[0104] During daily operation, the detection device continuously collects temperature data within the rigid airtight enclosure structure and calculates the real-time accumulated effective temperature through data statistics and algorithmic calculations. Based on the correspondence between the target effective accumulated temperature and a second time threshold, the ambient temperature required to be maintained during the aging stage is determined and used as the second temperature threshold. Through a temperature control device, the temperature within the enclosure structure can be controlled near the second temperature threshold, thereby providing a stable thermal environment for tobacco aging.

[0105] During the oxidation and aging of tobacco leaves, if the accumulated effective temperature obtained from real-time monitoring deviates from the target effective accumulated temperature, a closed-loop correction will be performed on the second temperature threshold based on the magnitude of the deviation. For example, when the effective accumulated temperature is lower than the target value, the control unit will appropriately increase the operating parameters of the temperature regulating device to increase the ambient temperature; conversely, when the effective accumulated temperature exceeds the target value, the ambient temperature will be lowered. This adjustment process is always constrained by the upper and lower temperature limits to prevent the tobacco leaves from deteriorating in quality at excessively high or low temperatures.

[0106] In this way, the second temperature threshold is no longer a static parameter, but is dynamically determined and corrected by combining effective accumulated temperature. This ensures that the tobacco leaves obtain sufficient heat accumulation during the curing process, while avoiding deviations in environmental control, thereby achieving a stable and reliable aging effect.

[0107] In step S840, when the tobacco leaf aging quality is about to reach the expected target, if production is not carried out, the stack needs to be restored to a low-oxygen state to inhibit further aging of the tobacco leaves, prevent over-aging, and avoid reducing the sensory and smoking quality of the tobacco leaves. The oxygen content is adjusted to the third oxygen content threshold to maintain the optimal state after aging. The temperature is adjusted to the third temperature threshold using a temperature control device to ensure a moderate temperature that continuously supports the quality maintenance of the tobacco leaves. The humidity is adjusted to the third humidity threshold to maintain a stable humidity environment to prevent the tobacco leaves from drying out or becoming moldy, ensuring effective maintenance throughout the entire stage.

[0108] This application utilizes a gas workstation to perform oxygen reduction operations within multiple rigid airtight enclosure structures. Due to the high nitrogen output and the coordination of the pipeline module, the oxygen reduction time of the rigid airtight enclosure structures can be rapidly reduced, improving oxygen reduction efficiency. Furthermore, this application can maintain the oxygen content below 0.5%, thereby improving insecticidal efficiency and significantly reducing the time the tobacco stacks are occupied in a low-oxygen state. This application utilizes a rigid airtight enclosure structure with thermal insulation design, enabling temperature control, thereby improving insecticidal efficiency and ensuring the stability of the fermentation process. By introducing automated data acquisition and control technology, parameters such as oxygen content, temperature, and humidity are monitored in real time, reducing manual intervention, improving safety and efficiency, and better achieving fermentation indicators, significantly shortening fermentation time, reducing the turnover cycle of the fermentation warehouse, and improving overall efficiency.

[0109] This application generates a maintenance plan based on the basic information of tobacco leaves, making maintenance decisions faster and more efficient compared to relying on the testing and inspection process. By simplifying the design process of the maintenance plan, it reduces the time and economic costs associated with testing and inspection, thereby improving the efficiency of maintenance management. Therefore, the tobacco leaf maintenance method of this application provides precise maintenance plans tailored to the characteristics of different tobacco leaves, ensuring that the quality of the tobacco leaves is maintained to the maximum extent during storage. Furthermore, the tobacco leaf maintenance system based on a rigid airtight enclosure structure can adjust the temperature to meet the requirements of different maintenance stages, thus improving maintenance efficiency.

[0110] Figure 9 This is a structural diagram of a tobacco leaf curing system module based on a rigid airtight enclosure structure, according to an embodiment of this application. Figure 9 As shown, the tobacco curing system based on a rigid airtight enclosure structure includes: The maintenance plan generation module 101 generates a maintenance plan based on the production year, origin, and grade information of the tobacco leaves within the rigid airtight enclosure structure. The maintenance plan includes at least the oxygen content, temperature, and humidity parameters within the rigid airtight enclosure structure. The first adjustment module 102 is used to adjust the oxygen content in the rigid airtight enclosure structure to a first oxygen content threshold and a first humidity threshold by adjusting the nitrogen concentration and humidity delivered to the rigid airtight enclosure structure by the gas workstation according to the maintenance plan, and to adjust the temperature in the rigid airtight enclosure structure to a first temperature threshold and maintain it to a first time threshold by the temperature control device. The second adjustment module 103 is used to adjust the oxygen content in the rigid airtight enclosure to a second oxygen content threshold and a second humidity threshold by adjusting the nitrogen concentration and humidity delivered to the rigid airtight enclosure by the gas workstation when the first time threshold is reached, and to adjust the temperature in the rigid airtight enclosure to a second temperature threshold and maintain the second time threshold by the temperature control device. The third adjustment module 104 is used to adjust the oxygen content in the rigid airtight enclosure to a third oxygen content threshold and a third humidity threshold by adjusting the nitrogen concentration and humidity delivered to the rigid airtight enclosure by the gas workstation when the second time threshold is reached, and to adjust the temperature in the rigid airtight enclosure to a third temperature threshold by using a temperature control device.

[0111] Experiment - Verification of the insecticidal effect of the tobacco leaf care system of this application Experimental design: Three experimental groups and one normoxic control group were set up, with different insecticidal treatment times (10 days, 15 days, and 20 days). Other conditions were the same, such as placing the same number of adult insects, larvae, and eggs.

[0112] Controlled atmosphere treatment: Under conditions of 20℃±1℃, the oxygen concentration in the three experimental groups was rapidly reduced to below 0.5% within 48 hours, while maintaining stable oxygen content and humidity; while the oxygen content in the normoxic control group was 21%, and the temperature and humidity were the same as those in the experimental groups.

[0113] Insecticide efficacy test: The mortality rates of adults and larvae were statistically analyzed within 48 hours after the end of the experiment; The insect eggs were cultured at (27±1)℃ and (70±3)%RH for 7-10 days, and the hatching status of the eggs was recorded.

[0114] Experimental results: Table 1

[0115] Flue-cured tobacco quality testing: The following analyses and tests were conducted on flue-cured tobacco treated with low-oxygen modified insecticide: (a) Chemical composition analysis of flue-cured tobacco: total alkaloids, total nitrogen, reducing sugars, total sugars, potassium, chlorine, and starch; (ii) Smoking test of flue-cured tobacco: aroma quality, aroma quantity, concentration, off-flavors, strength, irritation, and aftertaste; (III) Appearance identification of flue-cured tobacco: color, color purity, oil content, fullness, uniformity, brightness, and aroma.

[0116] Experiment Summary: Low-oxygen controlled atmosphere (CAA) technology effectively kills pests at different developmental stages, achieving a 100% mortality rate for both adults and larvae, with a significantly lower egg hatching rate compared to the normoxic control group. Furthermore, tests on the chemical composition, tasting characteristics, and appearance of flue-cured tobacco showed that the quality of the CAA-treated tobacco met relevant standards and was not significantly different from untreated tobacco. This demonstrates that CAA pest control technology is not only highly efficient but also maintains the superior characteristics of tobacco leaves, providing an effective solution for tobacco leaf maintenance.

[0117] It should be understood that each block or combination thereof in a flowchart and / or block diagram may be implemented by computer program instructions, by special-purpose hardware performing the specified function or action, or by a combination of special-purpose hardware and computer instructions. For example, these computer program instructions may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to form a machine such that these instructions, executed via such processor, enable the implementation of the function / action specified in each block or combination thereof in the flowchart and / or block diagram. Such a processor may be a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit.

[0118] The functional blocks shown in the structural block diagrams of this application can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc.; when implemented in software, they are programs or code segments used to perform the required tasks. Programs or code segments can be stored in memory or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. Code segments can be downloaded via computer networks such as the Internet or intranets.

[0119] It should be noted that this application is not limited to the specific configurations and processes described above or shown in the figures. The above descriptions are merely specific embodiments of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the described systems, devices, modules, or units can be referred to the corresponding processes in the method embodiments, and need not be repeated here. It should be understood that the scope of protection of this application is not limited thereto. Any person skilled in the art can obtain various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application.

Claims

1. A tobacco curing system based on a rigid airtight enclosure structure, characterized in that, include: Multiple rigid airtight enclosure structures are used to hold tobacco leaves. The rigid airtight enclosure structures are constructed using thermal insulation materials and have a thermal insulation function. A gas workstation is connected to multiple rigid, airtight enclosure structures via air inlet pipes, and the gas workstation is used to prepare nitrogen. A temperature control device is installed inside the rigid airtight enclosure structure to adjust the temperature inside the rigid airtight enclosure structure. The detection device includes a controller, which is electrically connected to an oxygen sensor, a temperature and humidity sensor, and a core temperature sensor disposed inside and / or outside the rigid airtight enclosure structure. The oxygen sensor and the temperature and humidity sensor are used to detect the oxygen content and temperature and humidity inside and / or outside the rigid airtight enclosure structure, respectively, and the core temperature sensor is used to detect the temperature of the tobacco leaves inside the tobacco box.

2. The tobacco leaf curing system according to claim 1, characterized in that, The controller is electrically connected to the oxygen sensor, temperature and humidity sensor and core temperature sensor via a data acquisition gateway. The data acquisition gateway is wirelessly connected to the cloud platform and sends the detection data to the controller and the cloud platform.

3. The tobacco leaf curing system according to claim 1, characterized in that, The detection device further includes: A flow meter is connected to the inlet pipe of the oxygen sensor via the main pipeline to control the flow rate of the pipeline. A gas delivery device is connected to the inlet pipe of the flow meter via a main road and is used to deliver gas to the flow meter. Multiple branches are connected to multiple rigid airtight enclosure structures via solenoid valves, and the gas delivery device delivers the gas to the gas detection device.

4. The tobacco leaf curing system according to claim 3, characterized in that, The diameters of the main road and the branch roads are both 6mm-10mm.

5. The tobacco leaf curing system according to claim 1, characterized in that, The detection device further includes a moisture sensor, a carbon dioxide sensor, and an ammonia sensor. The carbon dioxide sensor is used to detect the carbon dioxide content, the moisture sensor is used to detect the moisture content of the tobacco leaves inside the rigid airtight enclosure structure, and the ammonia sensor is used to detect the ammonia content. Based on one or more of the moisture content, oxygen content change value, temperature change value, carbon dioxide change value, and ammonia change value, it can be predicted whether the tobacco leaves have become moldy.

6. The tobacco leaf curing system according to claim 1, characterized in that, It further includes a humidity control module, which is connected to the gas outlet of the gas workstation via a pipeline, and the humidity control module is used to adjust the humidity of the gas.

7. The tobacco leaf curing system according to claim 1, characterized in that, Further includes: Insect monitoring device, including: An insect-attracting board, comprising a rubber board and a trapping core, is used to attract and capture pests for predictive analysis of pest infestations. The camera module is installed inside the insect monitoring device and is used to capture images of the insect-attracting board. The insect pest processor is electrically connected to the camera module and is used to identify the types and new numbers of insects based on image information.

8. The tobacco leaf curing system according to claim 1, characterized in that, The rigid airtight enclosure structure includes: The airtight enclosure body is composed of multiple airtight insulation panels spliced ​​together, with adjacent airtight insulation panels tightly connected. The tight connection includes tenon and mortise joints, insertion joints, and splicing. The splicing surfaces of the peripheral edges of the airtight insulation panels are all sealed with sealant.

9. The tobacco leaf curing system according to claim 8, characterized in that, The rigid airtight enclosure structure also includes an airtight door, which is movably connected to the airtight enclosure body. The outer edge of the airtight door is designed with a sealing strip. When the airtight door is in the closed state, the sealing strip is in airtight contact with the airtight enclosure body.

10. The tobacco leaf curing system according to claim 8, characterized in that, The rigid airtight enclosure structure also includes an air inlet and an air outlet, which are positioned diagonally.

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