A tobacco sheet roaster having a multi-angle injection device

Abstract

The utility model discloses a tobacco sheet roaster with multi-angle spraying device, tobacco sheet roaster includes the conveyer (12) of front part and rear part symmetry arrangement, and the drying section, cooling section and moisture regain section of middle part are sequentially arranged, the conveyer (12) includes feed inlet (10), discharge gate (11) and main web belt (9), the main web belt (9) is across and is placed in drying section, cooling section and moisture regain section inside, the bottom of main web belt (9) is provided with multi-angle spraying device (13), and multi-angle spraying device (13) is located drying section and moisture regain section respectively, the utility model provides tobacco sheet roaster, through setting up multi-angle spraying device (13), has realized the effective turnover of tobacco sheet, not only has improved the evenness of tobacco sheet's heat receiving, but also has improved moisture regain section tobacco sheet moisture absorption's evenness, has reduced tobacco sheet's broken rate, has improved flue -cured tobacco quality and production efficiency, is very suitable for industrialized production.

Description

Technical Field

[0001] This utility model belongs to the technical field of tobacco processing equipment, specifically relating to a tobacco curing machine with a multi-angle spray device. Background Technology

[0002] In the tobacco industry, flue-cured tobacco is a key raw material for cigarette production, and its quality directly affects the taste, aroma, and overall consumer experience of the final product. The tobacco curing process is a complex and delicate step, and the curing process itself is a crucial factor determining the quality of the flue-cured tobacco. However, traditional tobacco curing machines have inherent design flaws in the drying and rehumidification zones, which severely restrict further improvements in the quality of flue-cured tobacco.

[0003] Traditional tobacco curing machines typically use fixed heating elements to heat the tobacco leaves during the drying stage. Because the heating elements are fixed in position and the arrangement of the tobacco leaves during curing is relatively uniform, a significant temperature gradient occurs. The parts of the tobacco leaves closer to the heating elements tend to overheat, while those farther away are underheated. This uneven heating not only affects the intrinsic quality of the tobacco leaves, such as the retention and transformation of aroma components, but can also lead to inconsistent color and appearance, reducing the overall commercial value of the cured tobacco.

[0004] Regarding tumbling, traditional tobacco curing machines mostly employ a contact-type tumbling method, which involves directly pushing or turning the tobacco leaves using mechanical parts. While this method achieves tumbling to some extent, the direct contact between the mechanical parts and the tobacco leaves often causes mechanical damage, resulting in a high breakage rate. Breakage not only reduces the integrity of the tobacco leaves and decreases the usable leaf area, but also increases the difficulty and cost of subsequent processing, negatively impacting the utilization rate and production cost of the cured tobacco.

[0005] Furthermore, traditional tobacco curing machines have shortcomings in their design of the rehumidification zone. Rehumidification is a crucial step in the curing process, helping to balance the moisture content of the tobacco leaves and improve their flexibility and plasticity. However, because traditional curing machines lack effective moisture control and uniform distribution mechanisms in the rehumidification zone, uneven moisture absorption by the tobacco leaves often occurs during the rehumidification process.

[0006] In summary, the shortcomings of traditional tobacco curing machines in drying, turning, and rehumidification severely restrict further improvement in tobacco quality and effective control of production costs. Therefore, developing a device that can achieve uniform heating of tobacco sheets, effective turning, and reduced breakage rate is of great significance for improving the performance of tobacco curing machines and the quality of cured tobacco.

[0007] To address the aforementioned problems, this utility model is proposed. Utility Model Content

[0008] The purpose of this utility model is to provide a tobacco curing machine with a multi-angle spray device to overcome the shortcomings of existing traditional tobacco curing machines that cannot achieve uniform heating, effective tumbling, and reduced breakage rate of tobacco sheets. This invention achieves uniform heating and effective tumbling of tobacco sheets, reduces the breakage rate of tobacco sheets, and improves the quality of cured tobacco.

[0009] The objective of this utility model is achieved through the following technical solution:

[0010] A tobacco sheet drying machine with a multi-angle spray device is provided. The tobacco sheet drying machine includes a conveying device 12 symmetrically arranged at the front and rear, and a drying section, a cooling section and a rehydration section arranged sequentially in the middle. The conveying device 12 includes a feed inlet 10, a discharge outlet 11 and a main mesh belt 9. The main mesh belt 9 spans and is placed inside the drying section, the cooling section and the rehydration section. A multi-angle spray device 13 is provided at the bottom of the main mesh belt 9. The multi-angle spray device 13 is located in the drying section and the rehydration section respectively.

[0011] Preferably, the drying section is provided with a first dryer 1, a second dryer 2, a third dryer 3 and a fourth dryer 4 in sequence, the cooling section is provided with a cooler 8, and the rehumidification section is provided with a first tobacco rehumidifier 5, a second tobacco rehumidifier 6 and a third tobacco rehumidifier 7 in sequence.

[0012] Preferably, the multi-angle spray device 13 includes a rotating shaft 14 and airflow nozzles 15, which are distributed circumferentially along the rotating shaft 14, with a quantity of 4-8 nozzles. These airflow nozzles are circumferentially distributed at various corners of the multi-angle spray device 13, ensuring that hot air can be sprayed onto the tobacco sheets on the main mesh belt 9 inside the tobacco sheet drying machine from multiple directions. The design of the airflow nozzles ensures that the hot air can be sprayed out in a stable and concentrated airflow form, improving heat transfer efficiency and the force on the tobacco sheets, allowing the tobacco sheets on the main mesh belt 9 to rotate, resulting in uniform heating of the tobacco sheets in the drying section, and also ensuring uniform moisture absorption of the tobacco sheets in the rehumidification section.

[0013] Preferably, the airflow nozzle 15 has a plurality of symmetrically arranged nozzles 18, an airflow inlet 16, and a make-up air inlet 17, wherein the nozzles 18 are circular, elliptical, rectangular, or triangular in shape.

[0014] Preferably, the diameter of the rotating shaft 14 is in the range of 30-60mm, which can withstand various forces during the rotation of the multi-angle spraying device 13 and ensure long-term stable operation.

[0015] Preferably, the rotating shaft 14 is made of a material that is resistant to high temperature and corrosion and has good mechanical strength, such as stainless steel or alloy material.

[0016] Preferably, the multi-angle spray devices 13 are arranged in parallel or staggered arrangements, with a spacing of 50-150cm between adjacent sets of multi-angle spray devices. This ensures that the hot air can fully and evenly cover the entire tobacco sheet area inside the tobacco sheet roaster, achieving effective tumbling and uniform heating of the tobacco sheets.

[0017] Preferably, the main mesh belt 9 has holes distributed horizontally and vertically, and the holes are triangular in shape.

[0018] Preferably, the airflow inlet 16 is connected to a steam heat exchanger, and the air supply inlet 17 allows natural air to enter. The steam heat exchanger generates hot air and can precisely control the efficiency of heat exchange and heat output, thereby ensuring that the generated hot air temperature is stable and adjustable. By adjusting parameters such as steam flow rate, pressure, and temperature, the temperature of the hot air can be flexibly adjusted according to different tobacco curing process requirements and the actual condition of the tobacco. The heating power of the steam heat exchanger is 10-1000 kW, which can quickly provide sufficient heat as needed to meet the requirements of hot air temperature and flow rate at different curing stages, and its temperature adjustment accuracy can reach ±0.3℃. Allowing natural air to enter through the air supply inlet 17 further adjusts the temperature of the hot air entering the multi-angle spray device 13. The size of the air supply inlet 17 can be adjusted according to the airflow field and heat exchange conditions inside the tobacco curing machine, ensuring that an appropriate amount of natural air enters without negatively affecting the stability and spraying effect of the hot air.

[0019] Preferably, the number of symmetrically arranged nozzles 18 is 4-8.

[0020] Preferably, the tobacco curing machine can also be equipped with an automatic control system. This system uses PID or fuzzy control algorithms, based on data from sensors monitoring the actual temperature and humidity of the tobacco sheets inside the machine, to automatically adjust parameters such as the rotation speed of the rotating shaft 14, the airflow through the air inlet 17, and the flow rate, pressure, and temperature of the steam in the steam heat exchanger, according to deviations in temperature and humidity. The automatic control system employs advanced control algorithms and intelligent adjustment modules. When it detects that the temperature or humidity in a certain area of ​​the tobacco sheet is too high or unsuitable, it rapidly increases the rotation speed of the rotating shaft 14 near that area. This allows the hot air to be distributed more quickly and evenly onto the tobacco sheets, promoting tumbling and heat exchange, ensuring the tobacco sheets remain in a suitable temperature and humidity environment during the curing process, and ensuring uniform heating.

[0021] The working principle of the tobacco curing machine with a multi-angle injection device provided by this utility model is as follows:

[0022] The tobacco sheets are conveyed by conveying devices 12 symmetrically arranged at the front and rear. The conveying devices 12 include a feed inlet 10, a discharge outlet 11, and a main mesh belt 9.

[0023] The tobacco curing machine is equipped with a drying section, a cooling section, and a rehumidification section in sequence. The drying section is equipped with a first dryer 1, a second dryer 2, a third dryer 3, and a fourth dryer 4 in sequence. The cooling section is equipped with a cooler 8. The rehumidification section is equipped with a first tobacco rehumidifier 5, a second tobacco rehumidifier 6, and a third tobacco rehumidifier 7 in sequence.

[0024] The main mesh belt 9 spans and is placed inside the drying section, cooling section, and rehumidification section to carry and transport the smoke sheets.

[0025] In the drying and rehumidification sections, a multi-angle spray device 13 is installed at the bottom of the main mesh belt 9.

[0026] The multi-angle injection device 13 includes a rotating shaft 14 and airflow nozzles 15. The airflow nozzles 15 are distributed circumferentially along the rotating shaft 14, and the number is 4-8, ensuring that hot air can be injected into the smoke sheet from multiple directions.

[0027] The airflow nozzle 15 has multiple symmetrically arranged nozzles 18, numbering 4-8, an airflow inlet 16, and a make-up air inlet 17. The nozzles 18 can be circular, elliptical, rectangular, or triangular in shape.

[0028] The diameter of the rotating shaft 14 ranges from 30 to 60 mm. It is made of materials that are resistant to high temperature and corrosion and have good mechanical strength, such as stainless steel or alloy materials. It can withstand various forces during the rotation of the multi-angle spraying device and ensure long-term stable operation.

[0029] Hot air generation and regulation:

[0030] The airflow inlet 16 is connected to a steam heat exchanger. The steam heat exchanger generates hot air and can precisely control the efficiency of heat exchange and heat output, ensuring that the generated hot air temperature is stable and adjustable.

[0031] The steam heat exchanger has a heating power of 10-1000 kW and can quickly provide sufficient heat to meet the requirements of hot air temperature and flow rate at different baking stages. Its temperature regulation accuracy can reach ±0.3℃.

[0032] Natural air is introduced through the air intake vent 17, making the temperature of the hot air entering the multi-angle jet device 13 more adjustable. The size of the air intake vent can be adjusted according to the airflow field and heat exchange conditions inside the tobacco curing machine.

[0033] Uniform heating and tumbling of the tobacco sheets:

[0034] The multi-angle spray devices 13 are arranged in parallel or staggered arrangements, with a spacing of 50-150cm between adjacent sets of multi-angle spray devices, ensuring that hot air can fully and evenly cover the tobacco sheet area inside the tobacco sheet roasting machine.

[0035] Hot air is ejected from the airflow nozzle 15 in a stable and concentrated airflow form, which improves the heat transfer efficiency and the force on the tobacco sheets, enabling the tobacco sheets on the main mesh belt 9 to rotate, thereby achieving uniform heating in the drying section and uniform moisture absorption in the rehumidification section.

[0036] Adjustment of automatic control system:

[0037] The tobacco curing machine is equipped with an automatic control system that can make real-time adjustments based on data from sensors that detect the actual temperature and humidity of the tobacco sheets inside the machine.

[0038] The automatic control system employs a PID control algorithm or a fuzzy control algorithm to automatically adjust parameters such as the rotation speed of the rotating shaft 14, the air volume of natural air introduced through the air inlet 17, and the flow rate, pressure, and temperature of steam in the steam heat exchanger in real time, based on deviations in the temperature and humidity of the tobacco sheets. When it detects that the temperature in a certain area of ​​the tobacco sheets is too high or the humidity is unsuitable, the automatic control system rapidly increases the rotation speed of the rotating shaft 14 near that area, allowing the hot air to be distributed more quickly and evenly onto the tobacco sheets, promoting the tumbling of the tobacco sheets and heat exchange, and ensuring that the tobacco sheets are always in a suitable temperature and humidity environment during the roasting process.

[0039] The beneficial effects of this utility model are:

[0040] 1. This utility model provides a tobacco sheet drying machine with a multi-angle spray device, which achieves effective tumbling of tobacco sheets and reduces the breakage rate: Traditional tobacco sheet drying machines use a contact-type tumbling method, which easily causes mechanical damage to the tobacco sheets. This utility model utilizes the hot air force generated by the multi-angle spray device to achieve non-contact tumbling of the tobacco sheets, avoiding mechanical damage, effectively reducing the breakage rate, improving the integrity of the tobacco sheets, and reducing production costs. The hot air is sprayed out in a stable and concentrated airflow form, generating sufficient tumbling torque on the tobacco sheets, enabling them to tumble effectively in the drying section. This ensures that each tobacco sheet is heated evenly, avoiding local overheating or underheating, improving the heating uniformity of the tobacco sheets, and reducing the breakage rate. The rotating shaft and airflow nozzle of the multi-angle spray device are reasonably designed to withstand various forces during long-term operation, ensuring the stability and reliability of the tumbling effect.

[0041] 2. This utility model provides a tobacco leaf curing machine with a multi-angle spray device, which improves the uniformity of moisture absorption in the rehydration stage: traditional tobacco leaf curing machines lack effective moisture control and uniform distribution mechanisms in the rehydration stage. This utility model also incorporates a multi-angle spray device in the rehydration stage, promoting moisture absorption by spraying hot air. The multi-angle spray device can spray hot air onto the tobacco leaf from multiple directions, making moisture absorption more uniform in the rehydration stage and improving the flexibility and plasticity of the tobacco leaves. Natural air is introduced through the air inlet, which can regulate the temperature and humidity of the hot air, further enhancing the moisture absorption effect in the rehydration stage.

[0042] 3. This utility model provides a tobacco curing machine with a multi-angle spray device, which improves the quality and production efficiency of cured tobacco: Because the tobacco leaves are heated and absorb moisture evenly in the drying and rehumidification sections, the internal quality, appearance, color, and aroma of the cured tobacco are significantly improved. The reduced breakage rate decreases tobacco waste, improving tobacco utilization and production cost control. The application of an automatic control system enables intelligent and automated curing, improving production efficiency and the consistency of tobacco quality.

[0043] 4. This utility model provides a tobacco sheet roasting machine with a multi-angle spray device, enhancing the adaptability and flexibility of the equipment: the multi-angle spray device design allows the tobacco sheet roasting machine to adapt to the roasting needs of different types and specifications of tobacco sheets. The adjustable functions of the steam heat exchanger and air inlet allow the hot air temperature and humidity to be adjusted according to actual needs, enhancing the flexibility and adaptability of the equipment. The intelligent adjustment module of the automatic control system can make real-time adjustments according to the actual situation inside the tobacco sheet roasting machine, ensuring the stability and reliability of the roasting process.

[0044] 5. The tobacco sheet drying machine with a multi-angle spray device provided by this utility model has uniform hot air distribution and efficient tobacco sheet turning mechanism, which can accelerate the drying and rehydration speed of tobacco sheets, shorten the drying time, and improve the production efficiency of the tobacco sheet drying machine. Attached Figure Description

[0045] Figure 1 The present invention provides a structural diagram of a tobacco curing machine with a multi-angle spray device.

[0046] Figure 2 A schematic diagram of the main mesh belt structure of a tobacco curing machine with a multi-angle injection device provided by this utility model.

[0047] Figure 3 This utility model provides a schematic diagram of the structure of a multi-angle spray device for a tobacco curing machine with a multi-angle spray device.

[0048] Figure 4 This is a schematic diagram of the nozzle structure of a multi-angle jet device.

[0049] The meanings of the labels in each attached figure are as follows:

[0050] 1. First dryer; 2. Second dryer; 3. Third dryer; 4. Fourth dryer; 5. First tobacco rehumidifier; 6. Second tobacco rehumidifier; 7. Third tobacco rehumidifier; 8. Cooler; 9. Main conveyor belt; 10. Feed inlet; 11. Discharge outlet; 12. Conveying device; 13. Multi-angle spray device; 14. Rotating shaft; 15. Airflow nozzle; 16. Airflow inlet; 17. Make-up air inlet; 18. Spray hole. Detailed Implementation

[0051] like Figure 1-4 As shown, a tobacco sheet drying machine with a multi-angle spray device is disclosed. The tobacco sheet drying machine includes a conveying device 12 symmetrically arranged at the front and rear, and a drying section, a cooling section and a rehydration section arranged sequentially in the middle. The conveying device 12 includes a feed inlet 10, a discharge outlet 11 and a main mesh belt 9. The main mesh belt 9 spans and is placed inside the drying section, the cooling section and the rehydration section. A multi-angle spray device 13 is arranged at the bottom of the main mesh belt 9. The multi-angle spray device 13 is located in the drying section and the rehydration section respectively.

[0052] The drying section is provided with a first dryer 1, a second dryer 2, a third dryer 3 and a fourth dryer 4 in sequence. The cooling section is provided with a cooler 8. The rehumidification section is provided with a first tobacco rehumidifier 5, a second tobacco rehumidifier 6 and a third tobacco rehumidifier 7 in sequence.

[0053] The multi-angle injection device 13 includes a rotating shaft 14 and airflow nozzles 15. The airflow nozzles 15 are distributed circumferentially along the rotating shaft 14, and there are six airflow nozzles 15 in total. These airflow nozzles are circumferentially distributed at various corners of the multi-angle injection device 13, ensuring that hot air can be injected into the tobacco sheets on the main conveyor belt 9 inside the tobacco sheet curing machine from multiple directions. The design of the airflow nozzles ensures that the hot air is ejected in a stable and concentrated airflow form.

[0054] Improving heat transfer efficiency and the force applied to the tobacco sheets allows the tobacco sheets on the main mesh belt 9 to rotate, ensuring uniform heating of the tobacco sheets in the drying section and uniform moisture absorption in the rehumidification section.

[0055] The airflow nozzle 15 has a plurality of symmetrically arranged nozzles 18, an airflow inlet 16, and a make-up air inlet 17, wherein the nozzles 18 are circular in shape.

[0056] The diameter of the rotating shaft 14 is 50mm, which can withstand various forces during the rotation of the multi-angle spray device 13 and ensure long-term stable operation.

[0057] The rotating shaft 14 is made of a material that is resistant to high temperature and corrosion and has good mechanical strength, such as stainless steel or alloy material.

[0058] The multi-angle spray devices 13 are arranged in parallel or staggered arrangements, with a spacing of 100cm between adjacent sets of multi-angle spray devices. This ensures that the hot air can fully and evenly cover the entire tobacco sheet area inside the tobacco sheet roasting machine, achieving effective tumbling and uniform heating of the tobacco sheets.

[0059] The main mesh belt 9 has holes distributed horizontally and vertically, and the holes are triangular in shape.

[0060] The airflow inlet 16 is connected to a steam heat exchanger, and the air supply inlet 17 allows natural air to enter. The steam heat exchanger generates hot air and can precisely control the efficiency of heat exchange and heat output, thereby ensuring that the generated hot air temperature is stable and adjustable. By adjusting parameters such as steam flow rate, pressure, and temperature, the temperature of the hot air can be flexibly adjusted according to different tobacco curing process requirements and the actual condition of the tobacco. The heating power of the steam heat exchanger is 600 kilowatts, which can quickly provide sufficient heat as needed to meet the requirements of hot air temperature and flow rate at different curing stages, and its temperature adjustment accuracy can reach ±0.3℃. The air supply inlet 17 allows natural air to enter, further adjusting the temperature of the hot air entering the multi-angle injection device 13. The size of the air supply inlet 17 can be adjusted according to the airflow field and heat exchange conditions inside the tobacco curing machine, ensuring that an appropriate amount of natural air enters without negatively affecting the stability and injection effect of the hot air.

[0061] The number of symmetrically arranged nozzles 18 is 8.

[0062] The tobacco curing machine can also be equipped with an automatic control system. Based on data from sensors monitoring the actual temperature and humidity of the tobacco sheets inside the machine, the system uses PID or fuzzy control algorithms to automatically adjust parameters such as the rotation speed of the rotating shaft 14, the airflow through the air inlet 17, and the flow rate, pressure, and temperature of the steam in the steam heat exchanger, according to deviations in temperature and humidity. The automatic control system employs advanced control algorithms and intelligent adjustment modules. When it detects that the temperature in a certain area of ​​the tobacco sheet is too high or the humidity is unsuitable, it rapidly increases the rotation speed of the rotating shaft 14 near that area. This allows the hot air to be distributed more quickly and evenly onto the tobacco sheets, promoting tumbling and heat exchange, ensuring the tobacco sheets remain in a suitable temperature and humidity environment throughout the curing process, and ensuring uniform heating.

[0063] The working principle of the tobacco curing machine with a multi-angle injection device is as follows:

[0064] The tobacco sheets are conveyed by conveying devices 12 symmetrically arranged at the front and rear. The conveying devices 12 include a feed inlet 10, a discharge outlet 11, and a main mesh belt 9.

[0065] The tobacco curing machine is equipped with a drying section, a cooling section, and a rehumidification section in sequence. The drying section is equipped with a first dryer 1, a second dryer 2, a third dryer 3, and a fourth dryer 4 in sequence. The cooling section is equipped with a cooler 8. The rehumidification section is equipped with a first tobacco rehumidifier 5, a second tobacco rehumidifier 6, and a third tobacco rehumidifier 7 in sequence.

[0066] The main mesh belt 9 spans and is placed inside the drying section, cooling section, and rehumidification section to carry and transport the smoke sheets.

[0067] In the drying and rehumidification sections, a multi-angle spray device 13 is installed at the bottom of the main mesh belt 9.

[0068] The multi-angle injection device 13 includes a rotating shaft 14 and airflow nozzles 15. The airflow nozzles 15 are distributed circumferentially along the rotating shaft 14, and there are 6 of them, ensuring that hot air can be injected into the smoke sheet from multiple directions.

[0069] The airflow nozzle 15 has a plurality of symmetrically arranged nozzles 18, totaling eight, an airflow inlet 16, and a make-up air inlet 17. The nozzles 18 are circular in shape.

[0070] The rotating shaft 14 has a diameter of 50mm and is made of a material that is resistant to high temperature and corrosion and has good mechanical strength, such as stainless steel or alloy material. It can withstand various forces during the rotation of the multi-angle spraying device and ensure long-term stable operation.

[0071] Hot air generation and regulation:

[0072] The airflow inlet 16 is connected to a steam heat exchanger. The steam heat exchanger generates hot air and can precisely control the efficiency of heat exchange and heat output, ensuring that the generated hot air temperature is stable and adjustable.

[0073] The steam heat exchanger has a heating power of 600 kW, which can quickly provide sufficient heat as needed to meet the requirements of hot air temperature and flow rate at different baking stages. Its temperature regulation accuracy can reach ±0.3℃.

[0074] Natural air is introduced through the air intake vent 17, making the temperature of the hot air entering the multi-angle jet device 13 more adjustable. The size of the air intake vent can be adjusted according to the airflow field and heat exchange conditions inside the tobacco curing machine.

[0075] Uniform heating and tumbling of the tobacco sheets:

[0076] The multi-angle spray devices 13 are arranged in parallel or staggered arrangements, with a spacing of 100cm between two adjacent sets of multi-angle spray devices, ensuring that the hot air can fully and evenly cover the tobacco sheet area inside the tobacco sheet roasting machine.

[0077] Hot air is ejected from the airflow nozzle 15 in a stable and concentrated airflow form, which improves the heat transfer efficiency and the force on the tobacco sheets, enabling the tobacco sheets on the main mesh belt 9 to rotate, thereby achieving uniform heating in the drying section and uniform moisture absorption in the rehumidification section.

[0078] Adjustment of automatic control system:

[0079] The tobacco curing machine is equipped with an automatic control system that can make real-time adjustments based on data from sensors that detect the actual temperature and humidity of the tobacco sheets inside the machine.

[0080] The automatic control system employs a PID control algorithm or a fuzzy control algorithm to automatically adjust parameters such as the rotation speed of the rotating shaft 14, the air volume of natural air introduced through the air inlet 17, and the flow rate, pressure, and temperature of steam in the steam heat exchanger in real time, based on deviations in the temperature and humidity of the tobacco sheets. When it detects that the temperature in a certain area of ​​the tobacco sheets is too high or the humidity is unsuitable, the automatic control system rapidly increases the rotation speed of the rotating shaft 14 near that area, allowing the hot air to be distributed more quickly and evenly onto the tobacco sheets, promoting the tumbling of the tobacco sheets and heat exchange, and ensuring that the tobacco sheets are always in a suitable temperature and humidity environment during the roasting process.

[0081] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A tobacco sheet drying machine with a multi-angle spray device, the tobacco sheet drying machine comprising a conveying device (12) symmetrically arranged at the front and rear, and a drying section, a cooling section and a rehydration section arranged sequentially in the middle, the conveying device (12) comprising an inlet (10), an outlet (11) and a main mesh belt (9), the main mesh belt (9) spanning and placed inside the drying section, the cooling section and the rehydration section, characterized in that, The bottom of the main mesh belt (9) is provided with a multi-angle spray device (13), which is located in the drying section and the rehumidification section respectively.

2. The tobacco curing machine with a multi-angle injection device according to claim 1, characterized in that, The drying section is provided with a first dryer (1), a second dryer (2), a third dryer (3) and a fourth dryer (4) in sequence. The cooling section is provided with a cooler (8). The rehumidification section is provided with a first tobacco rehumidifier (5), a second tobacco rehumidifier (6) and a third tobacco rehumidifier (7) in sequence.

3. The tobacco curing machine with a multi-angle injection device according to claim 1, characterized in that, The multi-angle spray device (13) includes a rotating shaft (14) and airflow nozzles (15). The airflow nozzles (15) are distributed circumferentially along the rotating shaft (14), and the number of airflow nozzles (15) is 4-8.

4. The tobacco curing machine with a multi-angle injection device according to claim 3, characterized in that, The airflow nozzle (15) has multiple symmetrically arranged nozzles (18), an airflow inlet (16), and a make-up air inlet (17). The nozzles (18) are circular, elliptical, rectangular, or triangular in shape.

5. The tobacco curing machine with a multi-angle injection device according to claim 3, characterized in that, The diameter of the rotating shaft (14) ranges from 30 to 60 mm.

6. The tobacco curing machine with a multi-angle injection device according to claim 3, characterized in that, The rotating shaft (14) is made of stainless steel or alloy.

7. The tobacco curing machine with a multi-angle injection device according to claim 1, characterized in that, The multi-angle spraying devices (13) are arranged in parallel or staggered arrangements, and the distance between two adjacent groups of multi-angle spraying devices is 50-150cm.

8. The tobacco curing machine with a multi-angle injection device according to claim 1, characterized in that, The main mesh belt (9) has holes distributed horizontally and vertically, and the holes are triangular in shape.

9. The tobacco curing machine with a multi-angle injection device according to claim 4, characterized in that, The airflow inlet (16) is connected to a steam heat exchanger, and the air supply inlet (17) is for natural air.

10. The tobacco curing machine with a multi-angle injection device according to claim 4, characterized in that, The number of symmetrically arranged nozzles (18) is 4-8.

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