Airtight insecticidal system and method for tobacco storehouse
By conducting group testing and tiered nitrogen filling to reduce oxygen in the airtight tents of tobacco warehouses, the problems of long testing time and low insecticidal efficiency of airtight tents were solved, achieving efficient airtightness testing and rapid insecticidal effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2026-03-31
AI Technical Summary
The airtightness testing of airtight tents in tobacco warehouses takes a long time, and the efficiency of nitrogen filling and oxygen reduction is low. Pests survive for a long time in low-oxygen environments, resulting in low pest control efficiency.
The system employs a group testing and a stepped intermittent nitrogen-filling and oxygen-reducing mode. The airtight tents are tested in groups and nitrogen-filled and oxygen-reducing in turn through control equipment. Under low-oxygen conditions, carbon dioxide or dry ice is added to accelerate the suffocation and death of pests.
It improved the efficiency of airtightness testing, shortened the testing time, increased the nitrogen filling and oxygen reduction rate and insecticidal efficiency, and reduced costs.
Smart Images
Figure CN121753953A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of tobacco storage technology, and in particular to an airtight insecticidal system and method for tobacco warehouses. Background Technology
[0002] Tobacco typically needs to be stored in tobacco warehouses for more than two years for natural aging before it can be used in production. For large tobacco stacks, the weight of tobacco in each stack can range from several tons to tens of tons. During the storage process, the storage environment is constantly changing, and problems such as insect infestation and mold growth often occur.
[0003] Therefore, tobacco stacks need to be treated for pest control, and the three factors affecting pest control are: oxygen content, temperature, and humidity. Among these, oxygen content plays a decisive role. In low-oxygen pest control situations, for example, nitrogen can be injected into the airtight tent containing the tobacco stacks to replace the oxygen, thereby achieving the purpose of pest control.
[0004] Before nitrogen filling and oxygen reduction, an airtightness test can be performed on the airtight tent to eliminate the risk of damage to the membrane cover. Tobacco warehouses typically house a large number of airtight tents, and each tent requires an airtightness test, which is time-consuming. Secondly, the current nitrogen filling and oxygen reduction process is inefficient, requiring a long time for the oxygen content in multiple airtight tents in the tobacco warehouse to reach the expected pest control standard, resulting in a long processing time and high cost. Furthermore, the inventors of this application have found that pests in tobacco stacks can survive for a considerable period in a low-oxygen environment, therefore, the current low-oxygen pest control method has low pest control efficiency. Summary of the Invention
[0005] In view of this, embodiments of this application provide an airtight pest control system and an airtight pest control method for tobacco warehouses, to solve at least one of the above-mentioned technical problems.
[0006] This application provides an airtight pest control system for a tobacco warehouse. The tobacco warehouse contains multiple airtight tents, each containing a stack of tobacco. The tobacco stack is formed by stacking multiple tobacco boxes containing tobacco. The airtight pest control system for the tobacco warehouse includes control equipment, a nitrogen source, a carbon dioxide source, an air inlet pipe, an air outlet pipe, an air extraction device, and multiple micro-differential pressure sensors. The air inlet pipe is equipped with multiple air inlet valves, and the air outlet pipe is equipped with multiple air outlet valves. The nitrogen source is connected to the multiple airtight tents through the air inlet pipe and the multiple air inlet valves, and the air extraction device is connected to the multiple airtight tents through the air outlet pipe and the multiple air outlet valves. The multiple airtight tents are divided into multiple groups, and each group includes at least two airtight tents. When performing airtightness testing on each airtight tent in the i-th group, multiple micro-differential pressure sensors are respectively arranged inside each airtight tent in the i-th group, where i is a positive integer.
[0007] The control device is used to control the inlet valve corresponding to the i-th group to close, control the exhaust valve corresponding to the i-th group to open, control the pumping device to simultaneously pump air from each airtight tent in the i-th group, receive the first air pressure data in each airtight tent in the i-th group collected by multiple micro-differential pressure sensors, and when all the first air pressure data reach the preset air pressure range, control the pumping device and the exhaust valve corresponding to the i-th group to close. Then, based on the second air pressure data in each airtight tent in the i-th group collected by multiple micro-differential pressure sensors, simultaneously perform airtightness testing on each airtight tent in the i-th group. The control device is also used to control the nitrogen source, the pumping device, the inlet valve corresponding to the i-th group, and the exhaust valve corresponding to the i-th group to simultaneously perform N preset nitrogen filling and oxygen reduction processes on each airtight tent in the i-th group until the oxygen content in each airtight tent in the i-th group reaches the first preset content range, where N is a positive integer. The control device is also used to control the carbon dioxide gas source to fill carbon dioxide or add dry ice into each airtight tent in the i-th group after the oxygen content in each airtight tent in the i-th group reaches the first preset content range, until the carbon dioxide content in each airtight tent in the i-th group reaches the second preset content range.
[0008] According to some embodiments of this application, optionally, the control device is specifically used to start timing when each first air pressure data reaches a preset air pressure range; for any airtight tent in the i-th group, if the air pressure inside the airtight tent is maintained within the preset air pressure range for a duration greater than or equal to 5 minutes, the airtightness level of the airtight tent is determined to be Level 1 and the airtightness test is qualified; if the air pressure inside the airtight tent is maintained within the preset air pressure range for a duration greater than or equal to 2.5 minutes and less than 5 minutes, the airtightness level of the airtight tent is determined to be Level 2 and the airtightness test is unqualified; if the air pressure inside the airtight tent is maintained within the preset air pressure range for a duration greater than or equal to 1.5 minutes and less than 2.5 minutes, the airtightness level of the airtight tent is determined to be Level 3 and the airtightness test is unqualified.
[0009] According to some embodiments of this application, optionally, the airtight insecticidal system for tobacco warehouses also includes a moving mechanism, which is used to move multiple micro differential pressure sensors into each airtight tent in the j-th group when performing airtightness testing on each airtight tent in the j-th group, where j ≠ i and j is a positive integer.
[0010] According to some embodiments of this application, optionally, when the smoke box in the airtight tent of the i-th group does not have an inner liner bag, the preset nitrogen filling and oxygen reduction process is an open-loop evacuation and oxygen reduction settling process; when the smoke box in the airtight tent of the i-th group has an inner liner bag, the preset nitrogen filling and oxygen reduction process is an evacuation, filling, and settling process; wherein, the open-loop evacuation, oxygen reduction, and settling process includes at least an open-loop replacement sub-process, in which nitrogen is filled and evacuated from each airtight tent in the i-th group simultaneously; the evacuation, filling, and settling process involves first evacuating each airtight tent in the i-th group, then filling each airtight tent in the i-th group with nitrogen, and then settling the gas in each airtight tent in the i-th group.
[0011] According to some embodiments of this application, optionally, the open-loop evacuation and oxygen reduction settling process further includes a first evacuation sub-process, a first nitrogen filling sub-process, and a first settling sub-process. The first evacuation sub-process and the first nitrogen filling sub-process are located before the open-loop replacement sub-process, and the first settling sub-process is located after the open-loop replacement sub-process. The first evacuation sub-process involves controlling the inlet valve corresponding to the i-th group to close, controlling the exhaust valve corresponding to the i-th group to open, and controlling the evacuation equipment to simultaneously evacuate each airtight tent in the i-th group. The control equipment is used to execute the first nitrogen filling sub-process when the air pressure value in each airtight tent in the i-th group drops to a preset negative pressure threshold. The first nitrogen filling sub-process involves controlling the evacuation equipment to close, controlling the inlet valve corresponding to the i-th group to open, and controlling the nitrogen source to simultaneously fill each airtight tent in the i-th group. Each airtight tent in the i-th group is filled with nitrogen to reduce oxygen levels. The control equipment executes an open-loop replacement sub-process when each airtight tent in the i-th group reaches a first normal or positive pressure state. The open-loop replacement sub-process involves opening the intake valve and exhaust valve corresponding to the i-th group, controlling the nitrogen source to simultaneously fill the airtight tents in the i-th group with nitrogen to reduce oxygen, and controlling the extraction equipment to simultaneously extract air from the airtight tents in the i-th group. When the oxygen content in each airtight tent in the i-th group reaches a preset target value for the first sub-process, the control equipment executes a first settling sub-process. The first settling sub-process involves closing the intake valve and exhaust valve corresponding to the i-th group, allowing the gas in each airtight tent in the i-th group to settle for a preset time.
[0012] According to some embodiments of this application, optionally, the control device is used to control the nitrogen source, the pumping device, the inlet valve corresponding to the j-th group and the exhaust valve corresponding to the j-th group to simultaneously perform a preset nitrogen filling and oxygen reduction process on each airtight tent in the j-th group during the gas settling process in each airtight tent in the j-th group, where j≠i and j is a positive integer.
[0013] According to some embodiments of this application, optionally, the air extraction, inflation, and settling process includes a second air extraction sub-process, a second nitrogen filling sub-process, and a second settling sub-process; the second air extraction sub-process involves controlling the air intake valve corresponding to the i-th group to close, controlling the air exhaust valve corresponding to the i-th group to open, and controlling the air extraction device to simultaneously extract air from each airtight tent in the i-th group; the control device is used to execute the second nitrogen filling sub-process when the air pressure value in each airtight tent in the i-th group drops to a preset negative pressure threshold; the second nitrogen filling sub-process involves controlling the air extraction device and the air exhaust valve corresponding to the i-th group to simultaneously extract air from each airtight tent in the i-th group. When the gas valve is closed, the intake valve corresponding to the i-th group is opened, and the nitrogen source is controlled to simultaneously fill each airtight tent in the i-th group with nitrogen and reduce oxygen. The control equipment is used to execute the second settling sub-process when each airtight tent in the i-th group reaches the second normal pressure or positive pressure state and the oxygen content in each airtight tent in the i-th group reaches the preset target value of the first sub-process. The second settling sub-process is to close the intake valve and the exhaust valve corresponding to the i-th group and settling the gas in each airtight tent in the i-th group for a preset time.
[0014] According to some embodiments of this application, optionally, a carbon dioxide gas source is connected to multiple airtight tents through an air intake pipe and multiple air intake valves respectively; the control device is specifically used to control the nitrogen gas source to close after the oxygen content in each airtight tent in the i-th group reaches a first preset content range, control the air intake valve corresponding to the i-th group to open, and control the carbon dioxide gas source to fill carbon dioxide into each airtight tent in the i-th group until the carbon dioxide content in each airtight tent in the i-th group reaches a second preset content range.
[0015] According to some embodiments of this application, optionally, the first preset content range includes 0% to 0.5%, and the second preset content range includes 2% to 10%.
[0016] This application provides an airtight pest control method for a tobacco warehouse, applied to the airtight pest control system for a tobacco warehouse as described above. The airtight pest control method for a tobacco warehouse includes: controlling the inlet valve corresponding to the i-th group to close, controlling the exhaust valve corresponding to the i-th group to open, controlling the extraction device to simultaneously extract air from each airtight tent in the i-th group, and receiving first air pressure data collected by multiple micro-differential pressure sensors within each airtight tent in the i-th group; when all the first air pressure data reach a preset air pressure range, controlling the extraction device and the exhaust valve corresponding to the i-th group to close, and simultaneously extracting air from each airtight tent in the i-th group based on the second air pressure data collected by multiple micro-differential pressure sensors within each airtight tent in the i-th group. Each airtight tent in the group undergoes an airtightness test. After the airtightness test of each airtight tent in the i-th group is passed, the nitrogen source, the extraction equipment, the intake valve corresponding to the i-th group, and the exhaust valve corresponding to the i-th group are controlled to simultaneously perform N preset nitrogen filling and oxygen reduction processes on each airtight tent in the i-th group until the oxygen content in each airtight tent in the i-th group reaches the first preset content range, where N is a positive integer. After the oxygen content in each airtight tent in the i-th group reaches the first preset content range, the carbon dioxide source is controlled to fill each airtight tent in the i-th group with carbon dioxide until the carbon dioxide content in each airtight tent in the i-th group reaches the second preset content range.
[0017] The airtight insecticidal system and method for tobacco warehouses provided in the embodiments of this application offer several advantages. Firstly, the system can be used not only for airtightness testing of airtight tents but also for nitrogen filling and oxygen reduction. By grouping multiple airtight tents in the tobacco warehouse, the system can simultaneously test multiple tents in each group during airtightness testing, improving testing efficiency and shortening the overall testing time. Secondly, during nitrogen filling and oxygen reduction, the system employs a stepped, intermittent nitrogen filling and oxygen reduction mode, allowing for alternating nitrogen filling and oxygen replacement of multiple groups of airtight tents. This rapidly and efficiently reduces the oxygen content in each group of tents, improving the rate and efficiency of nitrogen filling and oxygen reduction. Thirdly, under low-oxygen conditions, introducing appropriate amounts of carbon dioxide or dry ice into the airtight tents can stimulate insect respiration, accelerating dehydration and suffocation, thus improving insecticidal efficiency. Attached Figure Description
[0018] 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.
[0019] Figure 1 This is a schematic diagram of an airtight insecticidal system for a tobacco warehouse provided in an embodiment of this application.
[0020] Figure 2 This is a schematic diagram of an open-loop evacuation, oxygen reduction, and settling process.
[0021] Figure 3 A schematic diagram of a process for the air extraction, air filling, and static setting step.
[0022] Figure 4 This is a schematic flowchart of an airtight insecticidal method for tobacco warehouses provided in an embodiment of this application. Detailed Implementation
[0023] 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.
[0024] 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.
[0025] 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.
[0026] 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 embodiments provided in this application can be combined with each other without contradiction.
[0027] Before describing the technical solutions provided in the embodiments of this application, in order to facilitate understanding of the embodiments of this application, this application first specifically explains the problems existing in the related technologies:
[0028] Tobacco typically needs to be stored in tobacco warehouses for more than two years for natural aging before it can be used in production. For large tobacco stacks, the weight of tobacco in each stack can range from several tons to tens of tons. During the storage process, the storage environment is constantly changing, and problems such as insect infestation and mold growth often occur.
[0029] Therefore, tobacco stacks need to be treated for pest control, and the three factors affecting pest control are: oxygen content, temperature, and humidity. Among these, oxygen content plays a decisive role. In low-oxygen pest control situations, for example, nitrogen can be injected into the airtight tent containing the tobacco stacks to replace the oxygen, thereby achieving the purpose of pest control.
[0030] Before nitrogen filling and oxygen reduction, an airtightness test can be performed on the airtight tent to eliminate the risk of damage to the membrane cover. Tobacco warehouses typically house a large number of airtight tents, and each tent requires an airtightness test, which is time-consuming. Secondly, the current nitrogen filling and oxygen reduction process is inefficient, requiring a long time for the oxygen content in multiple airtight tents in the tobacco warehouse to reach the expected pest control standard, resulting in a long processing time and high cost. Furthermore, the inventors of this application have found that pests in tobacco stacks can survive for a considerable period in a low-oxygen environment, therefore, the current low-oxygen pest control method has low pest control efficiency.
[0031] In view of the inventors’ above-mentioned research findings, the embodiments of this application provide an airtight pest control system and an airtight pest control method for tobacco warehouses, which can solve at least one of the above-mentioned technical problems existing in the related art.
[0032] The following is a description of the airtight insecticidal system for tobacco warehouses provided in the embodiments of this application.
[0033] Figure 1 This is a schematic diagram of an airtight insecticidal system for a tobacco warehouse provided in an embodiment of this application. Figure 1As shown, the tobacco warehouse 20 can house multiple airtight tents 200, and each airtight tent 200 can hold stacks of tobacco. Figure 1 (Not shown). Each tobacco stack may consist of multiple tobacco boxes stacked together, with tobacco placed inside the boxes.
[0034] An airtight insect control system 10 for tobacco warehouses may include a control device 101, a nitrogen source 102, a carbon dioxide source 103, an intake pipe G1, an exhaust pipe G2, an extraction device 104, and multiple micro-differential pressure sensors. Figure 1 (Not shown). The intake pipe G1 can be equipped with multiple intake valves 121, and the exhaust pipe G2 can be equipped with multiple exhaust valves 122. Each intake valve 121 can correspond to one airtight tent 200; for example, each intake valve 121 can be respectively located between the intake pipe G1 and each airtight tent 200. The nitrogen source 102 can be connected to multiple airtight tents 200 through the intake pipe G1 and the multiple intake valves 121. Each exhaust valve 122 can correspond to one airtight tent 200; for example, each exhaust valve 122 can be respectively located between the exhaust pipe G2 and each airtight tent 200. The extraction device 104 can be connected to multiple airtight tents 200 through the exhaust pipe G2 and the multiple exhaust valves 122. The multiple airtight tents 200 can be divided into multiple groups, and each group can include at least two airtight tents.
[0035] The i-th group is any one of multiple groups, where i is a positive integer. When performing airtightness testing on each airtight tent in the i-th group, multiple micro differential pressure sensors can be arranged inside each airtight tent in the i-th group.
[0036] To eliminate the potential for damage to the membrane cover of the airtight tents, an airtightness test can be performed on each airtight tent in the i-th group before nitrogen filling and oxygen reduction. Specifically, the control device 101 can be used to control the inlet valve 121 corresponding to the i-th group to close, control the exhaust valve 122 corresponding to the i-th group to open, and control the suction device 104 to simultaneously evacuate air from each airtight tent 200 in the i-th group. The control device 101 can also be used to receive first air pressure data collected by multiple micro-differential pressure sensors inside each airtight tent 200 in the i-th group, and control the suction device 104 and the exhaust valve 122 corresponding to the i-th group to close when all the first air pressure data reach a preset air pressure range. The size of the preset air pressure range can be flexibly adjusted according to the actual situation, and this application does not limit it.
[0037] After the exhaust device 104 and the exhaust valve 122 corresponding to the i-th group are closed, the control device 101 can also be used to simultaneously perform airtightness testing on each airtight tent in the i-th group based on the second air pressure data collected by multiple micro differential pressure sensors inside each airtight tent. Thus, by simultaneously performing airtightness testing on multiple airtight tents in the i-th group, the efficiency of airtightness testing is improved, and the overall time for airtightness testing of multiple airtight tents in the tobacco warehouse is shortened.
[0038] After the airtightness test of each airtight tent in the i-th group is passed, nitrogen filling and oxygen reduction can be performed on each airtight tent in the i-th group. Specifically, the control device 101 can also be used to control the nitrogen source 102, the extraction device 104, the intake valve 121 corresponding to the i-th group, and the exhaust valve 122 corresponding to the i-th group to simultaneously perform N preset nitrogen filling and oxygen reduction processes on each airtight tent 200 in the i-th group until the oxygen content in each airtight tent 200 in the i-th group reaches a first preset content range, where N is a positive integer. The size of the first preset content range can be flexibly adjusted according to the actual situation, and this application does not limit it.
[0039] The control device 101 can also be used to, after the oxygen content in each airtight tent 200 in the i-th group reaches a first preset content range, control the carbon dioxide gas source 103 to charge carbon dioxide or introduce dry ice into each airtight tent 200 in the i-th group until the carbon dioxide content in each airtight tent 200 in the i-th group reaches a second preset content range. Under low-oxygen conditions, by charging an appropriate amount of carbon dioxide or introducing dry ice into the airtight tent, the respiration of pests can be stimulated, accelerating the rate of dehydration and suffocation death of pests, and improving the insecticidal efficiency. The size of the second preset content range can be flexibly adjusted according to the actual situation, and this application does not limit it.
[0040] The airtight insecticidal system for tobacco warehouses provided in this application has several advantages. Firstly, it can be used not only for airtightness testing of airtight tents but also for nitrogen filling and oxygen depletion. By grouping multiple airtight tents in the tobacco warehouse, the system can simultaneously test multiple tents in each group during airtightness testing, improving testing efficiency and shortening the overall testing time. Secondly, during nitrogen filling and oxygen depletion, the system employs a stepped, intermittent nitrogen filling and oxygen depletion mode, allowing for alternating nitrogen filling and oxygen replacement of multiple groups of airtight tents. This rapidly and efficiently reduces the oxygen content in each group of tents, improving the rate and efficiency of nitrogen filling and oxygen depletion. Thirdly, under low-oxygen conditions, introducing appropriate amounts of carbon dioxide or dry ice into the airtight tents can stimulate insect respiration, accelerating dehydration and suffocation, thus improving insecticidal efficiency.
[0041] According to some embodiments of this application, optionally, the control device 101 can be used to start timing when the first air pressure data in each airtight tent in the i-th group reaches a preset air pressure range. The size of the preset air pressure range can be flexibly adjusted according to the actual situation, and this application does not limit it. For example, in some examples, the preset air pressure range can be -300pa to -150pa.
[0042] Table 1 schematically illustrates the airtightness testing standards. The airtightness testing process will be described below with reference to Table 1.
[0043] Table 1
[0044]
[0045] As shown in Table 1, taking a preset air pressure range of -300 Pa to -150 Pa as an example, the control device 101 can be used for any airtight tent in the i-th group. If the air pressure inside the airtight tent is maintained within the preset air pressure range for a duration greater than or equal to 5 minutes, the airtightness level of the airtight tent is determined to be Level 1 and the airtightness test is qualified; if the air pressure inside the airtight tent is maintained within the preset air pressure range for a duration greater than or equal to 2.5 minutes and less than 5 minutes, the airtightness level of the airtight tent is determined to be Level 2 and the airtightness test is unqualified; if the air pressure inside the airtight tent is maintained within the preset air pressure range for a duration greater than or equal to 1.5 minutes and less than 2.5 minutes, the airtightness level of the airtight tent is determined to be Level 3 and the airtightness test is unqualified. When the airtightness test of the airtight tent is unqualified, the airtight tent can be checked for leaks to eliminate the potential danger of damage to the membrane cover of the airtight tent.
[0046] According to some embodiments of this application, the airtight pest control system for tobacco warehouses may optionally include a moving mechanism. When performing airtightness testing on each airtight tent in the j-th group, the moving mechanism can be used to move multiple micro-differential pressure sensors into each airtight tent in the j-th group, where j ≠ i and j is a positive integer. Exemplarily, the moving mechanism includes, but is not limited to, a robotic arm.
[0047] The j-th group can be any group other than the i-th group, and this application does not limit this. After the airtightness test of each airtight tent in the i-th group, the airtightness test of each airtight tent in the j-th group can be performed. When performing the airtightness test of each airtight tent in the j-th group, the micro-differential pressure sensors located in each airtight tent in the i-th group can be moved to each airtight tent in the j-th group by a moving mechanism, and then the airtightness test of each airtight tent in the j-th group can be performed.
[0048] In this way, multiple micro differential pressure sensors can be reused when testing the airtightness of airtight tents in different groups, thereby reducing the cost of airtightness testing.
[0049] According to some embodiments of this application, optionally, when grouping multiple airtight tents in a tobacco warehouse, at least two airtight tents containing tobacco boxes of the same type can be grouped into the same group, so that the tobacco boxes placed in the airtight tents of the same group are of the same type. Based on whether or not the tobacco boxes contain inner lining bags, the tobacco boxes can be divided into two categories: the first category of tobacco boxes does not contain inner lining bags, and the second category of tobacco boxes contains inner lining bags for wrapping tobacco.
[0050] In some embodiments, if the smoke box in the airtight tent of the i-th group is not lined with an inner bag, the preset nitrogen filling and oxygen reduction process can be an open-loop evacuation and oxygen reduction settling process.
[0051] The open-loop evacuation and deoxygenation settling process can include at least an open-loop replacement sub-process. During this sub-process, nitrogen filling and evacuation are performed simultaneously on each airtight tent in the i-th group. This allows for gas circulation within each airtight tent in the i-th group, achieving rapid gas replacement and quickly reducing the oxygen content, thus improving the efficiency of nitrogen filling and deoxygenation.
[0052] In some embodiments, when the smoke box in the airtight tent of the i-th group is equipped with an inner liner bag, the preset nitrogen filling and oxygen reduction process can be a degassing, filling and settling process.
[0053] The process of evacuating, filling, and settling involves first evacuating the air from each airtight tent in the i-th group, then filling each airtight tent in the i-th group with nitrogen, and finally settling the gas inside each airtight tent in the i-th group.
[0054] By first evacuating the airtight tents in the i-th group, the air pressure inside the tents is lower than that inside the liner bag, allowing the gas in the liner bag to escape quickly through the opening. Then, nitrogen is introduced into each airtight tent in the i-th group to bring the air pressure inside to normal atmospheric pressure, such as slightly inflating the tents. Since a small amount of gas has already escaped from the liner bag, the oxygen content inside the liner bag is significantly reduced after nitrogen is introduced, allowing it to reach or approach the expected insecticidal standard, thus improving the insecticidal effect. Next, each airtight tent in the i-th group is allowed to stand for a preset time. This standing period balances the oxygen content inside the tobacco stack and the airtight tents, bringing them to a stable state. The preset standing time can be adjusted flexibly according to actual conditions, and this application does not limit it.
[0055] According to some embodiments of this application, optionally, the preset time for settling can be increased or decreased according to the size of the tobacco stacks inside the airtight tent and the oxygen reduction requirements of other stack locations. In some examples, the preset time for settling can be positively correlated with the number of tobacco boxes stacked in the tobacco stacks.
[0056] For example, the preset time for settling can be between 1 and 3 hours. For each additional preset number of tobacco boxes in the tobacco stack, the preset time can be increased by 1 hour. For multiple airtight tents in the i-th group, the tobacco stack with the most tobacco boxes in the multiple airtight tents can be identified, and the preset time can be adjusted according to the number of tobacco boxes in that tobacco stack.
[0057] Thus, when there are a large number of tobacco boxes stacked in the tobacco stack, increasing the preset time for settling can better balance the oxygen content inside the tobacco box and the stack, allowing it to reach a stable state.
[0058] Figure 2 This is a schematic diagram of an open-loop evacuation, oxygen reduction, and settling process. (Example:) Figure 2 As shown, according to some embodiments of this application, optionally, the open-loop evacuation and oxygen reduction settling process may further include a first evacuation sub-process 201, a first nitrogen filling sub-process 202, and a first settling sub-process 204. The first evacuation sub-process 201 and the first nitrogen filling sub-process 202 may be located before the open-loop replacement sub-process 203, and the first settling sub-process 204 may be located after the open-loop replacement sub-process 203.
[0059] The first evacuation sub-step 201 can control the air intake valve corresponding to the i-th group to close, control the air exhaust valve corresponding to the i-th group to open, and control the evacuation equipment to simultaneously evacuate air from each airtight tent in the i-th group, reducing the air pressure inside each airtight tent in the i-th group to negative pressure. While evacuating air from each airtight tent in the i-th group, the control equipment can control the air intake and air exhaust valves corresponding to other groups to close. For example, the evacuation equipment includes, but is not limited to, an air pump.
[0060] The control device can also be used to execute the first nitrogen filling sub-process when the air pressure in each airtight tent in the i-th group drops to a preset negative pressure threshold. The size of the preset negative pressure threshold can be flexibly adjusted according to the actual situation, and this application does not limit it.
[0061] The first nitrogen filling sub-process 202 can control the air extraction equipment to shut down, control the air intake valve corresponding to the i-th group to open, and control the nitrogen source to simultaneously fill each airtight tent in the i-th group with nitrogen and reduce oxygen. When filling each airtight tent in the i-th group with nitrogen and reducing oxygen, the control equipment can control the air intake valve and exhaust valve corresponding to other groups to close.
[0062] The control device can also be used to execute an open-loop displacement sub-process when each airtight tent in the i-th group reaches a first atmospheric pressure or positive pressure state. The first atmospheric pressure or positive pressure state means that the air pressure inside each airtight tent in the i-th group is filled to atmospheric pressure or positive pressure, such as filling each airtight tent in the i-th group to a non-contraction state. For example, this can be determined by detecting the air pressure value inside each airtight tent in the i-th group. When the air pressure value inside each airtight tent in the i-th group reaches a first preset atmospheric pressure or positive pressure threshold, it is considered that each airtight tent in the i-th group has reached the first atmospheric pressure or positive pressure state. The first preset atmospheric pressure or positive pressure threshold is greater than a preset negative pressure threshold. The magnitude of the first preset atmospheric pressure or positive pressure threshold can be flexibly adjusted according to actual conditions, and this application does not limit it in this regard.
[0063] The open-loop replacement sub-process 203 can control the opening of the intake valve and exhaust valve corresponding to the i-th group, control the nitrogen source to simultaneously fill each airtight tent in the i-th group with nitrogen and reduce oxygen, and control the extraction equipment to simultaneously extract air from each airtight tent in the i-th group. The extraction volume of the extraction equipment is less than or equal to the intake volume of the nitrogen source, thus ensuring that the extraction volume of each airtight tent in the i-th group is less than or equal to the nitrogen intake volume. This allows each airtight tent in the i-th group to be quickly filled with nitrogen, rapidly reducing the oxygen content within each tent and improving the efficiency of nitrogen filling and oxygen reduction.
[0064] When the air extraction capacity of the extraction device is less than the air intake capacity of the nitrogen generator, the difference between their volumes should not be too large; for example, the air extraction capacity should be slightly less than the air intake capacity. This ensures that the air pressure inside the airtight tent reaches or nearly reaches equilibrium, preventing the tent from bursting.
[0065] The control device can also be used to execute a first settling sub-process when the oxygen content in each airtight tent in the i-th group reaches a preset target value for the first sub-process. The first settling sub-process can involve closing the inlet valve and outlet valve corresponding to the i-th group, allowing the gas in each airtight tent in the i-th group to settle for a preset time. Settling allows for the balance of oxygen content within the tobacco stack and the airtight tents, achieving a stable state. The preset time can be flexibly adjusted according to actual conditions, and this application does not limit this.
[0066] According to some embodiments of this application, optionally, the control device can be used to control the nitrogen source, the extraction device, the intake valve corresponding to the i-th group, and the exhaust valve corresponding to the i-th group to perform N open-loop extraction and oxygen reduction settling processes when the smoke box in the airtight tent of the i-th group is not lined with an inner bag, so as to make the oxygen content in each airtight tent in the i-th group reach a first preset content range. N is a positive integer.
[0067] Specifically, the control device can be used to update the target value of the first sub-process after the completion of the first settling sub-process of the nth open-loop extraction and deoxygenation settling process, obtain the updated target value of the second sub-process, and execute the (n+1)th open-loop extraction and deoxygenation settling process based on the target value of the second sub-process. The target value of the second sub-process is less than the target value of the first sub-process, and n is a positive integer. The magnitudes of the target values of the first and second sub-processes can be flexibly adjusted according to actual conditions, and this application does not impose any limitations on this.
[0068] For example, in some examples, multiple sub-process target values can be set within an oxygen content range of 21% to 0.5%. These sub-process target values decrease sequentially. After each sub-process target value is reached, the airtight tents in the i-th group are left to stand for a preset time. The first sub-process target value can be one of the multiple sub-process target values, arranged in descending order. The second sub-process target value can be the sub-process target value that follows the first sub-process target value.
[0069] Thus, by adopting a stepped intermittent nitrogen filling and oxygen reduction mode, multiple sets of airtight tents can take turns filling and reducing oxygen, which can quickly and in batches reduce the oxygen content in each set of airtight tents, and further improve the rate and efficiency of nitrogen filling and oxygen reduction.
[0070] Figure 3 This is a schematic diagram of a process for vacuuming, inflating, and allowing the air to settle. (Example) Figure 3 As shown, according to some embodiments of this application, optionally, the evacuation, inflation and settling process may include a second evacuation sub-process 301, a second nitrogen inflation sub-process 302 and a second settling sub-process 303.
[0071] The second evacuation sub-step 301 can control the air intake valve corresponding to the i-th group to close, control the air exhaust valve corresponding to the i-th group to open, and control the evacuation equipment to simultaneously evacuate air from each airtight tent in the i-th group, reducing the air pressure inside each airtight tent in the i-th group to negative pressure. By evacuating air from each airtight tent in the i-th group, the air pressure inside the airtight tent can be lower than the air pressure in the inner liner bag, facilitating the rapid discharge of gas from the inner liner bag through the opening on the inner liner bag. While evacuating air from each airtight tent in the i-th group, the control equipment can control the air intake and exhaust valves corresponding to other groups to close.
[0072] The control equipment can also be used to execute a second nitrogen filling sub-process when the air pressure in each airtight tent in the i-th group drops to a preset negative pressure threshold. The second nitrogen filling sub-process can control the air extraction equipment and the exhaust valve corresponding to the i-th group to close, control the air intake valve corresponding to the i-th group to open, and control the nitrogen source to simultaneously fill each airtight tent in the i-th group with nitrogen and reduce oxygen.
[0073] Since the exhaust valve corresponding to the i-th group is closed, the nitrogen gas filled into the airtight tent will not be discharged through the exhaust valve and can be effectively filled into the inner liner bag. Furthermore, because a small portion of the gas in the inner liner bag has already been discharged during the second extraction process, the oxygen content in the inner liner bag can be significantly reduced after nitrogen is filled in, allowing it to reach or approach the expected insecticidal standard, thereby improving the insecticidal effect.
[0074] The control equipment can also be used to execute a second settling sub-process when each airtight tent in the i-th group reaches a second normal pressure or positive pressure state and the oxygen content in each airtight tent in the i-th group reaches a preset target value for the first sub-process. The second settling sub-process can be used to close the intake valve and exhaust valve corresponding to the i-th group, and settling the gas in each airtight tent in the i-th group for a preset time.
[0075] The second normal or positive pressure state refers to the air pressure inside each airtight tent in the i-th group being filled to normal or positive pressure, such as filling each airtight tent in the i-th group to a slightly inflated state. This can be determined by detecting the air pressure value inside each airtight tent in the i-th group. When the air pressure value inside each airtight tent in the i-th group reaches the second preset normal or positive pressure threshold, it is considered that each airtight tent in the i-th group has reached the second normal or positive pressure state. The second preset normal or positive pressure threshold is greater than a preset negative pressure threshold. The magnitude of the second preset normal or positive pressure threshold can be flexibly adjusted according to actual conditions, and this application does not limit it in this regard.
[0076] When each airtight tent in the i-th group reaches a second normal pressure or positive pressure state, and the oxygen content in each airtight tent in the i-th group reaches the preset target value of the first sub-process, the control equipment can close the air inlet valve and the exhaust valve corresponding to the i-th group, allowing the gas in each airtight tent in the i-th group to settle for a preset time. This settling process balances the oxygen content within the tobacco stack and the airtight tents, bringing them to a stable state. The preset settling time can be flexibly adjusted according to actual conditions, and this application does not limit it.
[0077] According to some embodiments of this application, optionally, the control device can be used to control the nitrogen source, the extraction device, the intake valve corresponding to the i-th group, and the exhaust valve corresponding to the i-th group to perform N extraction, inflation, and settling processes when the smoke box in the airtight tent of the i-th group has an inner liner bag, so that the oxygen content in each airtight tent in the i-th group reaches a preset range. N is a positive integer.
[0078] Specifically, the control device can be used to update the target value of the first sub-process after the second settling sub-process of the nth degassing, inflation, and settling process, obtaining the updated target value of the second sub-process, and then performing the (n+1)th degassing, inflation, and settling process based on the target value of the second sub-process. Here, the target value of the second sub-process is less than the target value of the first sub-process, and n is a positive integer. The magnitudes of the target values of the first and second sub-processes can be flexibly adjusted according to actual circumstances, and this application does not impose any limitations on this.
[0079] For example, in some examples, multiple sub-process target values can be set within an oxygen content range of 21% to 0.5%. These sub-process target values decrease sequentially. After each sub-process target value is reached, the airtight tents in the i-th group are left to stand for a preset time. The first sub-process target value can be one of the multiple sub-process target values, arranged in descending order. The second sub-process target value can be the sub-process target value that follows the first sub-process target value.
[0080] Thus, by adopting a stepped intermittent nitrogen filling and oxygen reduction mode, multiple sets of airtight tents can take turns filling and reducing oxygen, which can quickly and in batches reduce the oxygen content in each set of airtight tents, and further improve the rate and efficiency of nitrogen filling and oxygen reduction.
[0081] According to some embodiments of this application, optionally, the control device is used to control the nitrogen source, the pumping device, the inlet valve corresponding to the j-th group and the exhaust valve corresponding to the j-th group to simultaneously perform a preset nitrogen filling and oxygen reduction process on each airtight tent in the j-th group during the gas settling process in each airtight tent in the j-th group, where j≠i and j is a positive integer.
[0082] Specifically, the control equipment can be used to, if the smoke box in the airtight tent of the j-th group does not have an inner liner bag, control the nitrogen source, the extraction equipment, the inlet valve corresponding to the j-th group, and the exhaust valve corresponding to the j-th group to perform an open-loop extraction, oxygen reduction, and settling process, thereby filling each airtight tent in the j-th group with nitrogen to reduce oxygen. The control equipment can also be used to, if the smoke box in the airtight tent of the j-th group has an inner liner bag, control the nitrogen source, the extraction equipment, the inlet valve corresponding to the j-th group, and the exhaust valve corresponding to the j-th group to perform an extraction, filling, and settling process, thereby filling each airtight tent in the j-th group with nitrogen to reduce oxygen. The specific process is similar to that of the i-th group; please refer to the above, and will not be repeated here.
[0083] Similar to the i-th group, the j-th group can also adopt a stepped intermittent nitrogen filling and oxygen reduction mode, that is, set multiple sub-process target values, and the target values of multiple sub-processes are reduced sequentially. After each sub-process target value is reached, the airtight tents in the j-th group are left to stand for a preset time until the oxygen content in the airtight tents in the j-th group reaches the preset range.
[0084] Thus, during the static setting process of each airtight tent in the i-th group, by evacuating and filling the airtight tents of the j-th group with nitrogen to reduce oxygen, the overall rate and efficiency of nitrogen filling and oxygen reduction can be improved, and the overall time for nitrogen filling and oxygen reduction of multiple groups of airtight tents in the tobacco warehouse can be shortened.
[0085] like Figure 1 As shown, according to some embodiments of this application, optionally, the carbon dioxide gas source 103 can be connected to multiple airtight tents 200 through the air inlet pipe G1 and multiple air inlet valves 121 respectively.
[0086] Specifically, the control device 101 can be used to control the nitrogen source 102 to close, control the air intake valve 121 corresponding to the i-th group to open, and control the carbon dioxide source 103 to fill the airtight tents in the i-th group with carbon dioxide after the oxygen content in each airtight tent in the i-th group reaches the first preset content range, until the carbon dioxide content in each airtight tent in the i-th group reaches the second preset content range.
[0087] Thus, under low-oxygen conditions, by filling the airtight tent with an appropriate amount of carbon dioxide, the respiration of pests can be stimulated, the rate of dehydration and suffocation of pests can be accelerated, and the efficiency of pest control can be improved.
[0088] The inventors of this application have discovered that when the oxygen content inside an airtight tent is between 0% and 0.5%, and the carbon dioxide content is between 2% and 10%, a better insecticidal effect can be achieved, significantly shortening the insecticidal time. Therefore, in some embodiments, optionally, the first preset content range can be between 0% and 0.5%, and the second preset content range can be between 2% and 10%, thereby improving insecticidal efficiency and significantly shortening the insecticidal time.
[0089] According to some embodiments of this application, optionally, both the exhaust valve and the intake valve can be solenoid valves or electric valves. Both the exhaust valve and the intake valve can be automatically controlled to open or close by a control system or control equipment, thereby reducing the workload and error rate of manual valve opening and closing, and improving the rate and efficiency of nitrogen filling and oxygen reduction.
[0090] According to some embodiments of this application, the nitrogen source may optionally include a skid-mounted low-oxygen gas workstation. In some examples, the skid-mounted low-oxygen gas workstation integrates an air compressor, refrigerated dryer, nitrogen generator, fan, integrated display and control box, clean air system, and pipeline valves. All these key components are mounted on the same skid chassis, forming a highly integrated and easily transportable unit. This design not only facilitates transportation and rapid on-site deployment but also optimizes space utilization and achieves modularity and portability of the equipment.
[0091] According to some embodiments of this application, optionally, the airtight pest control system for tobacco warehouses may further include multiple oxygen content sensors. These multiple oxygen content sensors are communicatively connected to a control device, and are respectively arranged within multiple airtight tents, with at least one oxygen content sensor in each airtight tent. The oxygen content sensors can be used to collect oxygen content data within the airtight tent after the oxygen content within the airtight tent reaches a first preset range, and then send the oxygen content data to the control device.
[0092] In this way, during the insecticidal process, the oxygen content data inside the airtight tent is collected by the oxygen content sensor and sent to the control equipment. The oxygen content inside the airtight tent can be monitored online to ensure that the oxygen content inside the airtight tent is always within the first preset range during the insecticidal period, so that it has a good insecticidal effect.
[0093] According to some embodiments of this application, optionally, the control device can adjust the purity of the nitrogen output from the nitrogen source based on the oxygen content inside the airtight tents of each group. Taking the i-th group as an example, when the oxygen content inside each airtight tent of the i-th group is high, the control device can adjust the nitrogen source to output nitrogen of relatively high purity; when the oxygen content inside each airtight tent of the i-th group is low, the control device can adjust the nitrogen source to output nitrogen of relatively low purity, thereby making the oxygen content of the nitrogen output from the nitrogen source lower than the oxygen content inside the airtight tents, and thus reducing the oxygen content inside the airtight tents through nitrogen replacement.
[0094] Specifically, in some embodiments, when the control device controls the nitrogen source to simultaneously purge and de-oxygenate each airtight tent in the i-th group, it can receive the oxygen content of multiple airtight tents in the i-th group detected by oxygen sensors. For example, in some examples, at least one oxygen sensor can be arranged in each airtight tent in the i-th group, and the oxygen content of each airtight tent in the i-th group can be detected by the oxygen sensor. The control device can receive the oxygen content of multiple airtight tents in the i-th group detected by multiple oxygen sensors arranged in the i-th group.
[0095] The control device can also be used to adjust the purity of nitrogen output from the nitrogen source based on the maximum or average oxygen content among multiple airtight tents in the i-th group, with the purity adjusted in the range of 98% to 99.99%.
[0096] Specifically, the control device can be used to find the maximum oxygen content among multiple airtight tents in the i-th group. Alternatively, it can calculate the average oxygen content of multiple airtight tents in the i-th group. Based on this maximum or average value, the purity of the nitrogen output from the nitrogen source can be adjusted, and the purity of the nitrogen output from the nitrogen source can be adjusted within the range of 98% to 99.99%.
[0097] For example, in some specific embodiments, optionally, when the maximum or average value is ≥5%, the purity of the nitrogen output from the nitrogen source can be adjusted to ≥98%; when the maximum or average value is between 2% and 5%, the purity of the nitrogen output from the nitrogen source can be adjusted to ≥98.5%; when the maximum or average value is between 2% and 1%, the purity of the nitrogen output from the nitrogen source can be adjusted to ≥99.5%; and when the maximum or average value is between 0.5% and 1%, the purity of the nitrogen output from the nitrogen source can be adjusted to ≥99.9%.
[0098] This makes it easier to ensure that the oxygen content of the nitrogen output from the nitrogen source is lower than the oxygen content or average oxygen content in each airtight tent of the i-th group, thereby reducing the oxygen content in each airtight tent of the i-th group through nitrogen replacement.
[0099] In addition, during the step-by-step intermittent nitrogen filling and oxygen reduction process of the i-th group, the purity of the nitrogen output from the nitrogen source can be adjusted multiple times, thereby rapidly reducing the oxygen content in each airtight tent of the i-th group and shortening the nitrogen filling and oxygen reduction time.
[0100] Based on the same technical concept as the above-described product embodiments, this application also provides an airtight pest control method for tobacco warehouses. This method can be applied to the airtight pest control system for tobacco warehouses described in the above embodiments.
[0101] Figure 4 This is a schematic flowchart illustrating an airtight insecticidal method for tobacco warehouses provided in an embodiment of this application. Figure 4 As shown, the airtight pest control method for tobacco warehouses may include the following steps S401 to S404.
[0102] S401: Control the intake valve corresponding to the i-th group to close, control the exhaust valve corresponding to the i-th group to open, control the air extraction device to simultaneously extract air from each airtight tent in the i-th group, and receive the first air pressure data in each airtight tent in the i-th group collected by multiple micro differential pressure sensors.
[0103] S402: When all the first air pressure data reach the preset air pressure range, control the air extraction device and the exhaust valve corresponding to the i-th group to close, and simultaneously perform air tightness detection on each airtight tent in the i-th group based on the second air pressure data collected by multiple micro differential pressure sensors in each airtight tent in the i-th group.
[0104] S403: After each airtight tent in the i-th group passes the airtightness test, control the nitrogen source, the extraction equipment, the intake valve corresponding to the i-th group and the exhaust valve corresponding to the i-th group to simultaneously perform N preset nitrogen filling and oxygen reduction processes on each airtight tent in the i-th group until the oxygen content in each airtight tent in the i-th group reaches the first preset content range, where N is a positive integer.
[0105] S404: After the oxygen content in each airtight tent in the i-th group reaches the first preset content range, control the carbon dioxide gas source to fill carbon dioxide into each airtight tent in the i-th group until the carbon dioxide content in each airtight tent in the i-th group reaches the second preset content range.
[0106] The specific processes of S401 to S404 have been described in detail in the product embodiments above, and will not be repeated here for the sake of brevity.
[0107] The airtight insecticidal method for tobacco warehouses provided in the embodiments of this application has several advantages. Firstly, the system can not only test the airtightness of airtight tents but also perform nitrogen filling and oxygen reduction. By grouping multiple airtight tents in the tobacco warehouse, the system can simultaneously test multiple tents in each group during airtightness testing, improving testing efficiency and shortening the overall testing time. Secondly, during nitrogen filling and oxygen reduction, the system employs a stepped, intermittent nitrogen filling and oxygen reduction mode, allowing for alternating nitrogen filling and oxygen replacement of multiple groups of airtight tents. This rapidly and efficiently reduces the oxygen content in each group of tents, improving the rate and efficiency of nitrogen filling and oxygen reduction. Thirdly, under low-oxygen conditions, introducing appropriate amounts of carbon dioxide or dry ice into the airtight tents can stimulate insect respiration, accelerating dehydration and suffocation, thus improving insecticidal efficiency.
[0108] It should be noted that the airtight pest control method for tobacco warehouses has the same or corresponding technical features as the airtight pest control system for tobacco warehouses provided in the above product embodiments, and both can achieve their corresponding technical effects. For the sake of brevity, they will not be described in detail here.
[0109] 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 that enables the implementation of the function / action specified in each block or combination thereof in the flowchart and / or block diagram, as executed by such processor. Such processor may be a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit.
[0110] 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, for example, 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.
[0111] 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 conceive of various equivalent modifications or substitutions within the scope of the technology disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application.
Claims
1. An airtight insecticidal system for tobacco warehouses, characterized in that, The tobacco warehouse is provided with a plurality of airtight tents, and each airtight tent is provided with a tobacco stack formed by stacking a plurality of tobacco boxes containing tobacco; The system comprises a control device, a nitrogen gas source, a carbon dioxide gas source, an air inlet pipeline, an air outlet pipeline, a gas extraction device and a plurality of micro-pressure difference sensors, the air inlet pipeline is provided with a plurality of air inlet valves, the air outlet pipeline is provided with a plurality of air outlet valves, the nitrogen gas source is connected with the plurality of airtight tents through the air inlet pipeline and the plurality of air inlet valves, and the gas extraction device is connected with the plurality of airtight tents through the air outlet pipeline and the plurality of air outlet valves; the plurality of airtight tents are divided into a plurality of groups, and each group comprises at least two airtight tents; wherein, when the airtightness of each airtight tent in the ith group is detected, the plurality of micro-pressure difference sensors are arranged in each airtight tent in the ith group, and i is a positive integer; The control device is used for controlling the air inlet valve corresponding to the ith group to be closed, controlling the air outlet valve corresponding to the ith group to be opened, controlling the gas extraction device to simultaneously extract air from each airtight tent in the ith group, receiving first air pressure data of each airtight tent in the ith group collected by the plurality of micro-pressure difference sensors, and when each first air pressure data reaches a preset air pressure range, controlling the gas extraction device and the air outlet valve corresponding to the ith group to be closed, and then simultaneously detecting the airtightness of each airtight tent in the ith group according to second air pressure data of each airtight tent in the ith group collected by the plurality of micro-pressure difference sensors; The control device is also used for controlling the nitrogen gas source, the gas extraction device, the air inlet valve corresponding to the ith group and the air outlet valve corresponding to the ith group to simultaneously perform a preset nitrogen charging and oxygen reducing process on each airtight tent in the ith group for N times until the oxygen content in each airtight tent in the ith group reaches a first preset content range after the airtightness of each airtight tent in the ith group is detected to be qualified, and N is a positive integer; The control device is also used for controlling the carbon dioxide gas source to charge carbon dioxide or input dry ice into each airtight tent in the ith group until the carbon dioxide content in each airtight tent in the ith group reaches a second preset content range after the oxygen content in each airtight tent in the ith group reaches the first preset content range.
2. The system of claim 1, wherein, The control device is specifically used for timing when each first air pressure data reaches the preset air pressure range; for any one airtight tent in the ith group, if the air pressure in the airtight tent is maintained in the preset air pressure range for a time greater than or equal to 5 minutes, it is determined that the airtightness of the airtight tent is first-class and the airtightness detection is qualified; if the air pressure in the airtight tent is maintained in the preset air pressure range for a time greater than or equal to 2.5 minutes and less than 5 minutes, it is determined that the airtightness of the airtight tent is second-class and the airtightness detection is unqualified; if the air pressure in the airtight tent is maintained in the preset air pressure range for a time greater than or equal to 1.5 minutes and less than 2.5 minutes, it is determined that the airtightness of the airtight tent is third-class and the airtightness detection is unqualified.
3. The system of claim 1, wherein, The system further comprises a moving mechanism configured to move the plurality of micro-pressure difference sensors into the air-tight tents in the jth group when the air tightness of the air-tight tents in the jth group is detected, j≠i and j is a positive integer.
4. The system of claim 1, wherein, when the inner liner bag is not placed in the smoke box in the air-tight tent of the ith group, the preset nitrogen filling and oxygen reduction procedure is an open-loop air extraction and oxygen reduction standing procedure; when the inner liner bag is placed in the smoke box in the air-tight tent of the ith group, the preset nitrogen filling and oxygen reduction procedure is an air extraction and inflation standing procedure; wherein the open-loop air extraction and oxygen reduction standing procedure comprises at least an open-loop replacement sub-procedure, and in the open-loop replacement sub-procedure, nitrogen filling and air extraction are simultaneously performed on the air-tight tents in the ith group; the air extraction and inflation standing procedure comprises air extraction on the air-tight tents in the ith group, nitrogen filling on the air-tight tents in the ith group, and standing of the gas in the air-tight tents in the ith group.
5. The system of claim 4, wherein, The open-loop air extraction and oxygen reduction standing procedure further comprises a first air extraction sub-procedure, a first nitrogen filling sub-procedure, and a first standing sub-procedure, the first air extraction sub-procedure and the first nitrogen filling sub-procedure are located before the open-loop replacement sub-procedure, and the first standing sub-procedure is located after the open-loop replacement sub-procedure; the first air extraction sub-procedure comprises controlling the air inlet valve of the ith group to be closed, controlling the air outlet valve of the ith group to be opened, and controlling the air extraction device to simultaneously perform air extraction on the air-tight tents in the ith group; the control device is configured to perform the first nitrogen filling sub-procedure when the air pressure value in the air-tight tents in the ith group decreases to a preset negative pressure threshold; the first nitrogen filling sub-procedure comprises controlling the air extraction device to be closed, controlling the air inlet valve of the ith group to be opened, and controlling the nitrogen source to simultaneously perform nitrogen filling and oxygen reduction on the air-tight tents in the ith group; the control device is configured to perform the open-loop replacement sub-procedure when the air-tight tents in the ith group reach a first normal pressure or positive pressure state; the open-loop replacement sub-procedure comprises controlling the air inlet valve of the ith group and the air outlet valve of the ith group to be opened, controlling the nitrogen source to simultaneously perform nitrogen filling and oxygen reduction on the air-tight tents in the ith group, and controlling the air extraction device to simultaneously perform air extraction on the air-tight tents in the ith group; the control device is configured to perform the first standing sub-procedure when the oxygen content in the air-tight tents in the ith group reaches a preset first sub-procedure target value; the first standing sub-procedure comprises controlling the nitrogen source and the air inlet valve of the ith group to be closed, and standing the gas in the air-tight tents in the ith group for a preset time length.
6. The system of claim 5, wherein, the control device is configured to, during the standing of the gas in the air-tight tents in the ith group, perform a preset nitrogen filling and oxygen reduction procedure on the air-tight tents in the jth group that pass the air tightness detection, j≠i and j is a positive integer.
7. The system of claim 5, wherein, the air extraction and inflation standing procedure comprises a second air extraction sub-procedure, a second nitrogen filling sub-procedure, and a second standing sub-procedure; The second air extraction sub-process is to control the intake valve corresponding to the i-th group to be closed, control the exhaust valve corresponding to the i-th group to be opened, and control the air extraction device to simultaneously extract air from each air-tight tent in the i-th group; The control device is configured to execute a second nitrogen charging sub-process when the air pressure in each air-tight tent in the i-th group falls to a preset negative pressure threshold; the second nitrogen charging sub-process is to control the air extraction device and the exhaust valve corresponding to the i-th group to be closed, control the intake valve corresponding to the i-th group to be opened, and control the nitrogen source to simultaneously charge nitrogen and reduce oxygen in each air-tight tent in the i-th group; The control device is configured to execute a second static sub-process when each air-tight tent in the i-th group reaches a second normal pressure or positive pressure state and the oxygen content in each air-tight tent in the i-th group reaches a preset first sub-process target value; the second static sub-process is to control the nitrogen source and the intake valve corresponding to the i-th group to be closed, and to allow the gas in each air-tight tent in the i-th group to be static for a preset time length.
8. The system of claim 1, wherein, The carbon dioxide source is connected to the plurality of air-tight tents through the intake pipeline and the plurality of intake valves; The control device is specifically configured to, after the oxygen content in each air-tight tent in the i-th group reaches a first preset content range, control the nitrogen source to be closed, control the intake valve corresponding to the i-th group to be opened, and control the carbon dioxide source to charge carbon dioxide into each air-tight tent in the i-th group until the carbon dioxide content in each air-tight tent in the i-th group reaches a second preset content range.
9. The system of claim 1, wherein, The first preset content range includes 0% to 0.5%, and the second preset content range includes 2% to 10%.
10. A method for fumigating a tobacco storehouse airtight, characterized in that, The method is applied to the air-tight insecticidal system for the tobacco warehouse as claimed in any one of claims 1-9, and the method comprises: controlling the intake valve corresponding to the i-th group to be closed, controlling the exhaust valve corresponding to the i-th group to be opened, controlling the air extraction device to simultaneously extract air from each air-tight tent in the i-th group, and receiving first air pressure data in each air-tight tent in the i-th group collected by the plurality of micro pressure difference sensors; when each first air pressure data reaches a preset air pressure range, controlling the air extraction device and the exhaust valve corresponding to the i-th group to be closed, and simultaneously performing air tightness detection on each air-tight tent in the i-th group according to second air pressure data in each air-tight tent in the i-th group collected by the plurality of micro pressure difference sensors; after each air-tight tent in the i-th group passes the air tightness detection, simultaneously performing N preset nitrogen charging and oxygen reducing processes on each air-tight tent in the i-th group by the nitrogen source, the air extraction device, the intake valve corresponding to the i-th group, and the exhaust valve corresponding to the i-th group, until the oxygen content in each air-tight tent in the i-th group reaches a first preset content range, and N is a positive integer; after the oxygen content in each air-tight tent in the i-th group reaches the first preset content range, controlling the carbon dioxide source to charge carbon dioxide into each air-tight tent in the i-th group until the carbon dioxide content in each air-tight tent in the i-th group reaches a second preset content range.