Device and method for tobacco leaf threshing and redrying on-line spraying of S-ethofenprox

Abstract

The application discloses a device and method for spraying S-ethofenprox in tobacco threshing and redrying online. The device comprises a dosing unit, a spraying unit and a controller. The controller is connected with an online production control system. The spraying unit is connected with a leaf moistening drum equipment. The dosing unit comprises a medicine tank and a medicine transmission pipeline. The medicine tank is used for storing S-ethofenprox medicine. The spraying unit is used for spraying S-ethofenprox medicine on tobacco in the leaf moistening drum equipment. One end of the medicine transmission pipeline is connected with the medicine tank. The other end of the medicine transmission pipeline extends into the leaf moistening drum equipment and is connected with the spraying unit. A pneumatic diaphragm regulating valve connected with the controller is arranged on the medicine transmission pipeline. The device and method for spraying S-ethofenprox in tobacco threshing and redrying online can spray biological medicine online in tobacco threshing and redrying, so that the purpose of preventing and controlling insect pests of tobacco is achieved. The fumigation and insect killing process in the later storage process of cut tobacco is reduced. The device and method not only save cost, but also reduce chemical pollution and residues.

Description

Technical Field

[0001] This invention relates to the field of tobacco processing technology, and in particular to an apparatus and method for online spraying of S-acetamiprid during tobacco leaf pruning and re-drying. Background Technology

[0002] Currently, the main control measure for tobacco pests is the use of highly toxic fumigants (aluminum phosphide). However, the application of aluminum phosphide causes serious environmental pollution, poses safety hazards, and is increasingly subject to regulatory constraints.

[0003] In recent years, with the continuous development of social science and technology and people's increasing demands for safety, health, and environmental protection, the concepts of green, safe, environmentally friendly, non-toxic, and low-toxicity have been widely accepted and sought after. Insect growth regulators play a regulatory and controlling role in the growth, development, metamorphosis, and diapause of insects. Insect growth regulators are mainly divided into two categories: juvenile hormones and ecdysones. S-acetamiprid belongs to the juvenile hormone category and was first synthesized in the United States in the early 1960s (Su Tianyun, 2014). It was registered as a biological insecticide by the U.S. Environmental Protection Agency in 1982. Due to its high activity, relative target organism specificity, and good environmental safety, acetamiprid is widely used in public health, animal husbandry, urban areas, and warehousing. Currently, there are no reports of applying acetamiprid to pest control during the online processing of tobacco leaf aging in the leaf-brushing and re-drying process.

[0004] Therefore, there is an urgent need for an online spraying device and method for S-acetamiprid on tobacco leaves after leaf pruning and re-drying. Summary of the Invention

[0005] The purpose of this invention is to provide an apparatus and method for online spraying of S-tebufenozide on tobacco leaves during the leaf pruning and re-drying process, in order to solve the problems in the prior art. This invention enables the online spraying of biological agents during leaf pruning and re-drying to achieve the purpose of controlling pests on tobacco leaves, thereby reducing the need for fumigation and pest control in the later storage process of tobacco leaves, which not only saves costs but also reduces chemical pollution and residues.

[0006] This invention provides an online spraying device for S-tebufenozide on tobacco leaves after leaf trimming and re-drying, comprising:

[0007] The system includes a dosing unit, a spraying unit, and a controller. The controller is connected to an online production control system. The spraying unit is connected to a leaf-conditioning drum device. The dosing unit includes a pesticide tank and a pesticide delivery pipeline. The pesticide tank stores S-acetamiprid pesticide. The spraying unit sprays S-acetamiprid pesticide onto the tobacco leaves in the leaf-conditioning drum device. One end of the pesticide delivery pipeline is connected to the pesticide tank, and the other end extends into the leaf-conditioning drum device and connects to the spraying unit. A pneumatic diaphragm regulating valve is installed on the pesticide delivery pipeline. The pneumatic diaphragm regulating valve is connected to the controller. The controller adjusts the opening of the pneumatic diaphragm regulating valve according to the incoming tobacco leaf flow rate in the online production control system to adjust the flow rate of S-acetamiprid pesticide in the pesticide delivery pipeline, thereby adjusting the flow rate of S-acetamiprid pesticide sprayed by the spraying unit onto the tobacco leaves in the leaf-conditioning drum device.

[0008] The apparatus for online spraying of S-tebufenozide on tobacco leaves during the pruning and re-drying process described above is preferably provided in that the leaf-humidifying drum device includes a leaf-humidifying drum and a leaf-humidifying steam nozzle disposed at the top of the leaf-humidifying drum for spraying steam onto the tobacco leaves inside the leaf-humidifying drum.

[0009] In the above-described apparatus for online spraying of S-tebufenozide during tobacco leaf pruning and re-drying, preferably, the agent delivery pipe extends from the side wall of the leaf-wetting drum to the interior of the leaf-wetting drum, and the spraying unit is arranged opposite to the leaf-wetting steam nozzle.

[0010] The device for online spraying of S-tebufenozide on tobacco leaves during the leaf trimming and re-drying process as described above, wherein preferably, the spraying unit includes a fan-shaped nozzle.

[0011] The device for online spraying of S-tebufenozide on tobacco leaves after leaf trimming and re-drying, as described above, preferably includes a support leg and a frame beam disposed on the top of the support leg, with the pesticide tank disposed on the frame beam.

[0012] In the above-described device for online spraying of S-tebufenozide during tobacco leaf trimming and re-drying, preferably, a pressure pump is provided between the pesticide tank and the pneumatic diaphragm regulating valve, and the pressure pump is connected to the pesticide delivery pipeline and the pressure pump is connected to the controller.

[0013] In the above-described device for online spraying of S-tebufenozide on tobacco leaves during leaf trimming and re-drying, preferably, a shut-off valve is provided on the agent delivery pipeline and connected to the controller.

[0014] This invention also provides a method for online spraying of S-tebufenozide on tobacco leaves after leaf trimming and re-drying, comprising:

[0015] Install an online spraying device for S-acetamiprid during the leaf moistening process of tobacco leaf pruning and re-drying production;

[0016] Adjust the spraying concentration of the device for online spraying S-tebufenozide during tobacco leaf pruning and re-drying to maintain the spraying concentration at 8ppm-12ppm;

[0017] Open the pneumatic diaphragm regulating valve to transfer the S-tetramethrin agent in the agent delivery pipe, and spray it onto the tobacco leaves of the leaf-humidifying drum through the spray unit. The spray unit sprays the steam nozzles of the leaf-humidifying drum equipment in opposite directions.

[0018] The insect control effect of the sprayed smoke was evaluated.

[0019] The intrinsic quality of the tobacco leaves after spraying was evaluated.

[0020] The method for online spraying of S-tebufenozide on tobacco leaves during the pruning and re-drying process described above, preferably, involves adjusting the spraying concentration of the device used for online spraying of S-tebufenozide on tobacco leaves during pruning and re-drying to maintain the spraying concentration at 8 ppm-12 ppm, specifically including:

[0021] The actual required pesticide flow rate is determined based on the production volume of leaf re-drying, the spray concentration, and the volume of the pesticide tank.

[0022] Determine the online dosing flow rate based on the actual required dosing flow rate and the amount of pesticide loss.

[0023] The controller adjusts the opening of the pneumatic diaphragm regulating valve according to the incoming tobacco leaf flow rate in the online production control system, thereby regulating the flow rate of S-acetamiprid in the pesticide transmission pipeline, and further regulating the flow rate of S-acetamiprid sprayed by the spray unit onto the tobacco leaves in the leaf-moistening drum equipment.

[0024] The method for online spraying of S-tebufenozide on tobacco leaves after leaf trimming and re-drying, as described above, preferably includes, in part, evaluating the insect-control effect on the sprayed tobacco leaves, specifically comprising:

[0025] Take a certain amount of tobacco flakes and a certain amount of tobacco beetles and place them in an incubator. Observe them once a week and count the changes in the number of insects.

[0026] The evaluation of the intrinsic quality of the tobacco leaves after spraying specifically includes:

[0027] Sensory and chemical quality indicators were evaluated on tobacco leaves after spraying with S-acetamiprid. The sensory quality indicators included: aroma quality, aroma quantity, concentration, smoothness, aftertaste, off-flavors, irritation, and strength. The chemical indicators included: total sugar, reducing sugar, nicotine, total nitrogen, potassium content, and chlorine content.

[0028] This invention provides an apparatus and method for online spraying of S-acetamiprid during tobacco leaf pruning and re-drying. By spraying S-acetamiprid, an insecticidal biological agent, online, the purpose of controlling pests during the tobacco leaf aging process is achieved. The operation is simple and scientifically sound, achieving the goal of controlling pests in tobacco leaves without increasing equipment investment or changing the original process flow. It can prevent the occurrence of pests during the later storage process, reducing the need for fumigation and pest control in the later storage of tobacco leaves, reducing the need for pest control and maintenance during storage, saving maintenance costs and labor costs, reducing the residue of chemical agents such as aluminum phosphide fumigation, and reducing chemical pollution and residues. Attached Figure Description

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below with reference to the accompanying drawings, wherein:

[0030] Figure 1 This is a schematic diagram of an embodiment of the device for online spraying of S-tebufenozide during tobacco leaf trimming and re-drying provided by the present invention;

[0031] Figure 2 This is a flowchart illustrating an embodiment of the method for online spraying of S-tebufenozide during tobacco leaf trimming and re-drying provided by the present invention.

[0032] Explanation of reference numerals in the attached drawings: 1-Controller, 2-Dosing unit, 3-Spraying unit, 4-Wetting drum equipment, 5-Online production control system, 21-Outrigger, 22-Frame beam, 23-Drug tank, 24-Drug transfer pipeline, 25-Pressure pump, 26-Pneumatic diaphragm regulating valve, 27-Stop valve, 41-Wetting drum, 42-Wetting steam nozzle. Detailed Implementation

[0033] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0034] The terms "first," "second," and similar words used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "above" and "below" are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0035] In this disclosure, when a specific component is described as being located between a first component and a second component, an intermediary component may or may not be present between the specific component and the first or second component. When a specific component is described as connecting to other components, the specific component may be directly connected to the other components without having an intermediary component, or it may not be directly connected to the other components but may have an intermediary component.

[0036] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0037] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0038] Example 1

[0039] like Figure 1As shown in the figure, this invention provides an online spraying device for S-tebufenozide on tobacco leaves during the leaf trimming and re-drying process. The device includes a dosing unit 2, a spraying unit 3, and a controller 1. The controller 1 is connected to an online production control system 5. The spraying unit 3 is connected to a leaf-moistening drum device 4. The dosing unit 2 includes a pesticide tank 23 and a pesticide delivery pipe 24. The pesticide tank 23 stores S-tebufenozide pesticide. The spraying unit 3 sprays S-tebufenozide pesticide onto the tobacco leaves in the leaf-moistening drum device 4. One end of the pesticide delivery pipe 24 is connected to the pesticide tank 23. One end is connected to the other end, which extends into the leaf-moistening drum device 4 and is connected to the spraying unit 3. A pneumatic film regulating valve 26 is provided on the agent transmission pipe 24. The pneumatic film regulating valve 26 is connected to the controller 1. The controller 1 is used to adjust the opening of the pneumatic film regulating valve 26 according to the incoming tobacco leaf flow rate in the online production control system 5, so as to adjust the flow rate of S-acetamiprid agent in the agent transmission pipe 24, and thus adjust the flow rate of S-acetamiprid agent sprayed by the spraying unit 3 onto the tobacco leaves in the leaf-moistening drum device 4.

[0040] The controller 1 is a programmable logic controller (PLC). In this invention, the PLC model is Siemens S7-300. It should be noted that this invention does not specifically limit the type and model of the controller 1. The controller 1 adjusts the opening of the pneumatic diaphragm regulating valve 26 according to the incoming tobacco leaf flow rate in the online production control system 5, thereby achieving matching between the chemical dosing flow rate and the incoming tobacco leaf flow rate. In specific implementation, control parameters for the chemical dosing unit 2 can be set in the controller 1. These control parameters can include, for example, setting the chemical ratio, dosage, and dosing accuracy. Taking a 12,000 kg leaf re-drying production line as an example, with an S-tebufenozide concentration of 10 ppm, and following the principle of adding the agent once per production shift, a shift producing 150,000 kg requires 1.5 kg of S-tebufenozide. The tank is designed to be 600 liters, with 20% empty capacity. The S-tebufenozide concentration is diluted with 95%-100% alcohol to 500 liters of 0.3% S-tebufenozide, which is then placed in tank 23. The data parameters of the controller 1 are designed as follows: agent concentration setting ratio 0.333%, feeding rate 40 kg / h, and dosing accuracy 0.00%, etc.

[0041] Furthermore, the leaf-moistening drum device 4 includes a leaf-moistening drum 41 and a leaf-moistening steam nozzle 42 disposed at the top of the leaf-moistening drum 41 for spraying steam onto the tobacco leaves inside the leaf-moistening drum 41.

[0042] Furthermore, the pesticide delivery pipe 24 extends from the side wall of the moistening roller 41 to the interior of the moistening roller 41, and the spray unit 3 is arranged opposite to the moistening steam nozzle 42. The spray unit 3 is a fan-shaped nozzle. The high-temperature steam ejected from the moistening steam nozzle 42 sprays downwards and faces the fan-shaped upward-facing spray unit 3. The moistening steam nozzle 42 sprays water vapor from top to bottom, while the spray unit 3 sprays the pesticide in a fan shape from bottom to top, giving the pesticide droplets the characteristics of circling, penetrating, and more uniform application. This not only improves the coverage of the target's front and back sides but also reduces droplet drift. Simultaneously, it improves the uniformity of droplet distribution, ensuring that S-acetamiprid pesticide is sprayed evenly and accurately onto the tobacco leaves, thus greatly improving the control effect and utilization rate of acetamiprid.

[0043] Furthermore, the dosing unit also includes a support leg 21 and a frame beam 22 disposed on the top of the support leg 21, and the medicine tank 23 is disposed on the frame beam 22.

[0044] Furthermore, a pressure pump 25 is provided between the medicine tank 23 and the pneumatic diaphragm regulating valve 26, and the pressure pump 25 is connected to the medicine delivery pipeline 24 and the controller 1. The controller 1 can adjust the threshold of the pressure pump 25 to regulate the pressure value inside the medicine tank 23.

[0045] Furthermore, a shut-off valve 27 is installed on the pesticide delivery pipeline 24 and connected to the controller 1. When the production information in the online production control system 5 shows that the leaf-wetting drum equipment 4 is in normal production, the shut-off valve 27 is in the open state; when the production information in the online production control system 5 shows that the leaf-wetting drum equipment 4 is stopped, the controller 1 sends a shut-off command to the shut-off valve 27, causing the shut-off valve 27 to switch from the open state to the shut-off state. Under the action of the shut-off valve 27, the pesticide pumped out of the pesticide delivery pipeline 24 can flow back into the pesticide tank 23. In this invention, the dosing unit 2 is located downstream of the controller 1, which can realize the storage, delivery, and recovery of S-acetamiprid pesticide.

[0046] During operation, when online production is underway, the parameters such as the pesticide setting ratio, dosage, and dosing accuracy of the dosing unit 2 are set in the controller 1. During the production process, the pressure pump 25 and the pneumatic diaphragm regulating valve 26 are first turned on, and the S-tetramethrin pesticide in the pesticide tank 23 is transferred through the pesticide transmission pipeline 24 and sprayed onto the tobacco leaves of the leaf-moistening roller 41 through the spray unit 3. Moreover, the spray unit 3 sprays in opposite directions with the leaf-moistening steam nozzle 42 to ensure that the pesticide is fully dispersed and more uniform. At the same time, when production is paused, the S-tetramethrin pesticide can be returned to the pesticide tank 23 through the shut-off valve 27.

[0047] The device for online spraying of S-tebufenozide during tobacco leaf pruning and re-drying provided in this invention achieves the purpose of controlling pests during the tobacco leaf aging process by spraying S-tebufenozide, an insecticidal biological agent, online. It is simple to operate, scientific and reasonable, and can achieve the purpose of controlling pests in tobacco leaves without increasing equipment investment or changing the original process flow. It can prevent the occurrence of pests during the later storage process, reduce the fumigation and pest control steps in the later storage process of tobacco leaves, reduce the need for pest control and maintenance during storage, save maintenance costs and labor costs, reduce the residue of chemical agents such as aluminum phosphide fumigation, and reduce chemical pollution and residues.

[0048] Example 2

[0049] like Figure 2 As shown, the present invention also provides a method for online spraying of S-tebufenozide on tobacco leaves after leaf trimming and re-drying, which specifically includes the following steps in actual implementation:

[0050] Step S1: Install an online spraying device for S-acetamiprid during the leaf moistening process of tobacco leaf threshing and re-drying.

[0051] Specifically, install at the location of the leaf-lubricating roller. Figure 1 The device shown is for online spraying of S-tebufenozide during tobacco leaf trimming and re-drying.

[0052] Step S2: Adjust the spraying concentration of the online spraying device for S-tebufenozide during tobacco leaf pruning and re-drying to maintain the spraying concentration at 8ppm-12ppm.

[0053] In one embodiment of the present invention, the spraying concentration of S-tebufenozide is maintained at 10 ppm. In one embodiment of the method for online spraying of S-tebufenozide during tobacco leaf trimming and re-drying according to the present invention, step S2 specifically may include:

[0054] Step S21: Determine the actual required pesticide flow rate based on the production volume of leaf re-drying, spray concentration, and pesticide tank volume.

[0055] Step S22: Determine the online dosing flow rate based on the actual required dosing flow rate and the amount of pesticide loss.

[0056] For a 12,000 kg tobacco leaf threshing and re-drying production line, the production capacity of one shift is approximately 150,000 kg. The concentration of the insect growth regulator S-tebufenozide sprayed online is 10 ppm. The online spraying device is designed at the leaf-wetting drum position, with a 600-liter tank. The design is to first dilute S-tebufenozide to 0.3% with 95%-100% alcohol. If the spraying concentration reaches 10 ppm, considering the 20-30% pesticide loss during the spraying process, the online concentration is designed to be 0.40%, the online dosing rate is 40 kg / h, and the dosing accuracy is 0.00%.

[0057] Step S23: The controller adjusts the opening of the pneumatic diaphragm regulating valve according to the incoming tobacco leaf flow rate in the online production control system, so as to regulate the flow rate of S-tebufenozide in the agent transmission pipeline, and then regulate the flow rate of S-tebufenozide sprayed by the spray unit onto the tobacco leaves in the leaf-moistening drum equipment.

[0058] Step S3: Open the pneumatic diaphragm regulating valve, transfer the S-tetramethrin agent in the agent tank through the agent transfer pipeline, and spray it onto the tobacco leaves of the leaf-humidifying drum through the spray unit. The spray unit sprays the steam nozzles of the leaf-humidifying drum equipment in opposite directions.

[0059] Step S4: Evaluate the insect control effect of the sprayed smoke.

[0060] Specifically, a certain number of tobacco flakes and a certain number of tobacco beetles were placed in an incubator, and the insect count was recorded weekly. If the number of larvae remained unchanged, it proved that the insect control effect was 100%.

[0061] Step S5: Evaluate the internal quality of the tobacco leaves after spraying.

[0062] Specifically, sensory quality and chemical indicators were evaluated on tobacco leaves after spraying with S-acetamiprid. The sensory quality indicators included: aroma quality, aroma quantity, concentration, smoothness, aftertaste, off-flavors, irritation, and strength. The chemical indicators included: total sugar, reducing sugar, nicotine, total nitrogen, potassium content, and chlorine content.

[0063] In one embodiment of this invention, the following example illustrates the process: a 12,000 kg tobacco leaf re-drying production line at a re-drying plant in Dali, Yunnan Province, with a per-shift production capacity of approximately 150,000 kg, uses an online spraying concentration of 10 ppm for the insect growth regulator S-acetamiprid. The online spraying device is located at the roller position of the second leaf-dried section, with a 600-liter tank. First, S-acetamiprid is diluted to 0.3% using 95%-100% alcohol. Considering a 20-30% loss of pesticide during spraying, the online control system parameters are set at a concentration of 0.40%, an online application rate of 40 kg / h, and an application accuracy of 0.00%. The experiment began in December 2019 at a re-drying plant in Dali, Yunnan Province. The tobacco samples were from Chuxiong, Wenshan, Qujing, and Dali in Yunnan Province, grade C3F, and dated 2019. The sample list is shown in Table 1.

[0064] Table 1 List of Tobacco Leaf Samples

[0065]

[0066] Evaluate insect control effect

[0067] The storage periods were 0 months, 6 months, 12 months, 18 months, and 24 months. The treatment process was divided into an S-tebufenozide spraying group and a control group. 100g of finished tobacco flakes and 30 tobacco beetle larvae were randomly placed in culture bottles. The ambient temperature was 28±2℃, and the relative humidity was 70%±5%. Observations were made weekly to monitor changes in the number of larvae. Observations were recorded for four consecutive weeks. If the number of larvae remained constant, the insect control effect was considered 100%. The experimental results are shown in Table 2. Table 2 shows that the control sample (CK) contained 30 larvae and other stages, indicating that under suitable temperature and humidity conditions, the larvae developed into pupae or adults. When there were more than 30 larvae, the adults could hatch into larvae. The tobacco leaf samples treated with S-tebufenozide (T1-T4) remained in the larval stage. Two pupae appeared between 18 and 24 months, and the pupae died four weeks later. This indicates that the efficacy of S-tebufenozide decreased in the later stages of storage. Therefore, after aging for 24 months, attention should be paid to the risk of pest infestation due to the weakened efficacy.

[0068] Table 2. Record of insect control effect of S-tebufenozide spraying treatment at different stages of alcoholization

[0069]

[0070]

[0071] Effects of S-acetamiprid treatment on the intrinsic quality of tobacco leaves

[0072] In one embodiment of this invention, the sensory quality indicators are evaluated using a sensory evaluation method. Specifically, the sensory quality assessment method is employed, with 11 professional tasters evaluating the sensory quality of the tobacco samples as shown in Tables 1 and 2. Each indicator is quantified using a 9-point scale. The evaluation criteria include 10 indicators: aroma prominence, aroma quality, aroma quantity, concentration, smoothness, aftertaste, off-flavors, irritation, combustibility, and ash content. Table 3 shows that at aging times of 0, 6, 12, 18, and 24 months, the sensory quality scores of the four tobacco samples (T1-T4) treated with S-acetamiprid were basically consistent with those of the control group samples (CK1-CK4). S-acetamiprid treatment does not affect the aging process and does not adversely affect the sensory quality of the tobacco leaves.

[0073] Table 3. Comparative analysis of sensory quality scores between sprayed treatments and the control at different stages of aging.

[0074] deal with 0 months 6 months 12 months 18 months 24 months CK1 66.63 67.24 67.98 69.12 71.02 T1 66.23 67.32 68.01 69.27 70.97 CK2 67.29 68.76 69.02 71.02 72.03 T2 67.3 68.78 69.08 71.05 72.01 CK3 66.32 67.23 68.35 71.24 72.35 T3 66.35 67.21 68.36 71.23 72.32 CK4 67.21 68.05 69.56 72.31 73.06 T4 67.21 68.05 69.54 72.29 73.06

[0075] Note: Sensory total score (T) = (A+B)×2.0 + (C+D)×1.5 + E+F+G+H.

[0076] In one embodiment of this invention, the test method used to evaluate chemical indicators is a conventional chemical evaluation method. Specifically, the chemical indicators include: total sugar, reducing sugar, nicotine, total nitrogen, potassium content, and chlorine content. As shown in Table 4, at aging times of 0 months, 6 months, 12 months, 18 months, and 24 months, the S-acetamiprid sprayed treatment of the first tobacco leaf sample (T1) was basically consistent with the conventional chemical composition of the control sample (CK1), indicating that the S-acetamiprid spraying treatment does not affect the intrinsic chemical composition and does not change the chemical composition of the tobacco leaves.

[0077] Table 4. Comparative analysis of chemical composition between sprayed treatments and controls at different stages of alcoholysis.

[0078]

[0079] The method for online spraying of S-acetamiprid during tobacco leaf pruning and re-drying provided in this invention achieves the purpose of controlling pests during the tobacco leaf aging process by spraying S-acetamiprid, an insecticidal biological agent, online. The operation is simple, scientific and reasonable, and can achieve the purpose of controlling pests in tobacco leaves without increasing equipment investment or changing the original process flow. It can prevent the occurrence of pests during the later storage process, reduce the need for fumigation and pest control in the later storage process of tobacco leaves, reduce the need for pest control and maintenance during storage, save maintenance costs and labor costs, reduce the residue of chemical agents such as aluminum phosphide fumigation, and reduce chemical pollution and residues.

[0080] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0081] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A device for online spraying of S-acetamiprid during tobacco leaf trimming and re-drying, characterized in that, include: The system includes a dosing unit, a spraying unit, and a controller. The controller is connected to an online production control system. The spraying unit is connected to a leaf-conditioning drum device. The dosing unit includes a pesticide tank and a pesticide delivery pipeline. The pesticide tank stores S-acetamiprid pesticide. The spraying unit sprays S-acetamiprid pesticide onto the tobacco leaves in the leaf-conditioning drum device. One end of the pesticide delivery pipeline is connected to the pesticide tank, and the other end extends into the leaf-conditioning drum device and is connected to the spraying unit. A pneumatic diaphragm regulating valve is installed on the pesticide delivery pipeline. The pneumatic diaphragm regulating valve is connected to the controller. The controller adjusts the opening of the pneumatic diaphragm regulating valve according to the incoming tobacco leaf flow rate in the online production control system to adjust the flow rate of S-acetamiprid pesticide in the pesticide delivery pipeline, thereby adjusting the flow rate of S-acetamiprid pesticide sprayed by the spraying unit onto the tobacco leaves in the leaf-conditioning drum device. The leaf-moistening drum device includes a leaf-moistening drum and a leaf-moistening steam nozzle disposed at the top of the leaf-moistening drum for spraying steam onto the tobacco leaves inside the leaf-moistening drum. The agent transmission pipe extends from the side wall of the leaf-moistening drum into the interior of the leaf-moistening drum, and the spraying unit is disposed opposite to the leaf-moistening steam nozzle.

2. The device for online spraying of S-tebufenozide during tobacco leaf trimming and re-drying according to claim 1, characterized in that, The spray unit includes a fan-shaped nozzle.

3. The device for online spraying of S-tebufenozide during tobacco leaf trimming and re-drying according to claim 1, characterized in that, The dosing unit also includes support legs and a frame beam mounted on top of the support legs, with the medicine tank mounted on the frame beam.

4. The device for online spraying of S-tebufenozide during tobacco leaf trimming and re-drying according to claim 1, characterized in that, A pressure pump is installed between the medicine tank and the pneumatic diaphragm regulating valve, and the pressure pump is connected to the medicine delivery pipeline and the controller.

5. The device for online spraying of S-tebufenozide during tobacco leaf trimming and re-drying according to claim 1, characterized in that, The drug delivery pipeline is equipped with a shut-off valve, which is connected to the controller.

6. A method for online spraying of S-tebufenozide on tobacco leaves during the leaf trimming and re-drying process using the apparatus described in any one of claims 1-5, characterized in that, Includes the following steps: Install an online spraying device for S-acetamiprid during the leaf-moistening process of tobacco leaf pruning and re-drying production; Adjust the spraying concentration of the device for online spraying S-tebufenozide during tobacco leaf pruning and re-drying to maintain the spraying concentration at 8ppm-12ppm; Open the pneumatic diaphragm regulating valve to transfer the S-tetramethrin agent in the agent delivery pipe, and spray it onto the tobacco leaves of the leaf-humidifying drum through the spray unit. The spray unit sprays the steam nozzles of the leaf-humidifying drum equipment in opposite directions. The insect control effect of the sprayed smoke was evaluated. The intrinsic quality of the tobacco leaves after spraying was evaluated.

7. The method for online spraying of S-tebufenozide on tobacco leaves during leaf trimming and re-drying according to claim 6, characterized in that, The method for adjusting the spraying concentration of S-tebufenozide applied online during tobacco leaf trimming and re-drying, maintaining the concentration between 8 ppm and 12 ppm, specifically includes: The actual required pesticide flow rate is determined based on the production volume of leaf re-drying, the spray concentration, and the volume of the pesticide tank. Determine the online dosing flow rate based on the actual required dosing flow rate and the amount of pesticide loss. The controller adjusts the opening of the pneumatic diaphragm regulating valve according to the incoming tobacco leaf flow rate in the online production control system, thereby regulating the flow rate of S-acetamiprid in the pesticide transmission pipeline, and further regulating the flow rate of S-acetamiprid sprayed by the spray unit onto the tobacco leaves in the leaf-moistening drum equipment.

8. The method for online spraying of S-tebufenozide on tobacco leaves during leaf trimming and re-drying according to claim 6, characterized in that, The evaluation of the insect-control effect of the sprayed tobacco specifically includes: Take a certain amount of tobacco flakes and a certain amount of tobacco beetles and place them in an incubator. Observe them once a week and count the changes in the number of insects. The evaluation of the intrinsic quality of the tobacco leaves after spraying specifically includes: Sensory and chemical quality indicators were evaluated on tobacco leaves after spraying with S-acetamiprid. The sensory quality indicators included: aroma quality, aroma quantity, concentration, smoothness, aftertaste, off-flavors, irritation, and strength. The chemical indicators included: total sugar, reducing sugar, nicotine, total nitrogen, potassium content, and chlorine content.

Images