Intelligent control system for reducing temperature difference of curing barn

Abstract

This utility model discloses an intelligent control system for reducing temperature differences in a tobacco curing barn, relating to the field of tobacco curing technology. It includes a tobacco loading chamber with a heating chamber located in the middle of its right side. An air inlet is located at the bottom of the heating chamber and communicates with the tobacco loading chamber. The system also includes a dehumidification component, a temperature difference control mechanism, a cold air supply component, an air guide control mechanism, and a circulation control mechanism. The dehumidification component is installed on the top side of the tobacco loading chamber. The temperature difference control mechanism includes a fan. A vertical air duct is located in the middle of the heating chamber, and a heating exhaust duct is located on the right side of the tobacco loading chamber. The bottom of the vertical air duct communicates with the bottom of the heating exhaust duct. The upper and lower ends of the heating exhaust duct are respectively connected to the tobacco loading chamber through two exhaust channels. Each exhaust channel is equipped with an air guide control mechanism. This intelligent control system for reducing temperature differences in the tobacco curing barn helps to balance the temperature between the upper and lower layers inside the barn, improving the quality of the cured tobacco.

Description

Technical Field

[0001] This utility model relates to the field of drying room technology, specifically to an intelligent control system for reducing temperature differences in drying rooms. Background Technology

[0002] After the tobacco leaves mature, they need to be dried and processed in a curing barn. Currently, the most commonly used curing barns are either airflow rising or airflow falling types. However, existing curing barns are prone to temperature differences between the top and bottom or low-temperature dead zones, which can easily affect the quality of the flue-cured tobacco. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide an intelligent control system that reduces the temperature difference in the curing barn, which helps to balance the temperature of the upper and lower layers inside the curing barn, improves the quality of the cured tobacco, and can effectively solve the problems in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an intelligent control system for reducing temperature differences in a tobacco curing barn, comprising a tobacco loading chamber, a heating chamber located in the middle of the right side of the tobacco loading chamber, an air inlet at the bottom of the heating chamber, the air inlet communicating with the tobacco loading chamber, and further comprising: A dehumidification unit is installed on the top side of the smoke chamber; The temperature difference control mechanism includes a vertical air duct, a heating exhaust duct, a fan, a heater, and a circulating air outlet. A vertical air duct is located in the middle of the heating chamber, and a heating exhaust duct is located on the right side of the smoke loading chamber. The bottom of the vertical air duct is connected to the bottom of the heating exhaust duct. The upper and lower ends of the heating exhaust duct are connected to the smoke loading chamber through two exhaust channels, respectively. Each exhaust channel is equipped with an air guide control mechanism. The top left side of the vertical air duct is connected to the smoke loading chamber through a circulating air outlet, which is equipped with a circulation control mechanism. A fan is installed in the middle of the vertical air duct with its air outlet facing downwards. A heater is installed at the bottom of the vertical air duct. A cold air supply unit is installed on the heating chamber and is connected to the top of the vertical air duct.

[0005] The tobacco loading chamber is equipped with racks for placing the tobacco leaves to be cured. The tobacco leaves are placed on the racks in the tobacco loading chamber. The heating chamber is used to install the temperature difference control mechanism. During the actual curing process, the circulation control mechanism opens the circulating air vents, the cold air supply component closes the top of the vertical air duct, the heater works first to heat the air at the bottom of the vertical air duct, and then the fan blows air downwards to allow the hot air at the bottom of the vertical air duct to enter the heating exhaust duct. Then, it enters the tobacco loading chamber through the two exhaust channels at the top and bottom of the heating exhaust duct, raising the base temperature in the tobacco loading chamber. The air guide control mechanism can be used to close the exhaust channels or guide the hot air discharged from the exhaust channels, allowing the discharged hot air to be discharged at different pitch angles, so that the hot air is evenly distributed in the tobacco loading chamber. When the temperature of the upper and lower layers of the smoke loading chamber is not uniform, for example, when the temperature of the upper layer of the smoke loading chamber is higher than that of the lower layer, the exhaust channel at the upper end of the heating exhaust duct is sealed by the air guide control mechanism, and the hot air is discharged only from the exhaust channel at the lower end of the heating exhaust duct, which helps to increase the temperature of the lower layer of the smoke loading chamber. When the overall temperature inside the smoke loading chamber is too high, the heater stops working, the cold air supply component opens the top of the vertical air duct, and the fan blows air downwards, which can introduce some cold air from outside into the smoke loading chamber to reduce the overall temperature inside the smoke loading chamber. When the humidity inside the tobacco loading chamber increases, the circulating control mechanism closes the circulating air vents, the heater continues to work, the cold air supply component opens the top of the vertical air duct, and the fan blows air downwards, which can introduce dry air from outside. After heating, it is sent into the tobacco loading chamber, allowing the humid air inside the tobacco loading chamber to be discharged through the dehumidification component. While maintaining a suitable baking temperature inside the tobacco loading chamber, the humidity of the internal air is reduced, which promotes the drying of the tobacco leaves.

[0006] Furthermore, the dehumidification assembly includes a dehumidification vent and louvers. The dehumidification vent is located on the top side of the tobacco loading chamber, and louvers are installed inside the vent. The dehumidification vent allows humid air to escape from the tobacco loading chamber, promoting continuous drying of the tobacco leaves. The louvers prevent external debris from entering the tobacco loading chamber through the dehumidification vent, while not hindering the expulsion of humid air.

[0007] Furthermore, the air guide control mechanism includes a rectangular frame, a rotating shaft, an air guide control plate, a control plate synchronous flipping control component, and a control slot. A rectangular frame is installed in each exhaust duct. A control slot is opened on the rear side of the rectangular frame. Multiple vertically arranged rotating shafts are rotatably connected at equal intervals within the rectangular frame. Each rotating shaft is fixedly connected to the middle of the air guide control plate. The rear end of each rotating shaft extends into the control slot and is connected to the control plate synchronous flipping control component. The synchronous flip control component of the control panel is used to synchronously drive the rotation of each shaft within a rectangular frame, thereby driving the air guide control plate to rotate. When the end of the air guide control plate near the smoke loading chamber swings upward, it can guide the hot air passing through the rectangular frame upward. When the end of the air guide control plate near the smoke loading chamber swings downward, it can guide the hot air passing through the rectangular frame downward. This can change the direction of the hot air entering the smoke loading chamber, promote the uniform distribution of hot air in the smoke loading chamber, and reduce the temperature difference between the upper and lower layers of the smoke loading chamber. When all the air guide control plates are in the vertical state, the air guide control plates close the inner side of the rectangular frame, and hot air can no longer pass through the exhaust duct here, thereby achieving the closed control of the exhaust duct.

[0008] Furthermore, the circulation control mechanism includes an upper groove, an electric telescopic rod, and a circulation damper. The upper groove is located at the top of the circulation vent, and the top of the electric telescopic rod is fixedly connected to the top of the upper groove. The bottom of the electric telescopic rod is fixedly connected to the top center of the circulation damper. When the electric telescopic rod shortens, it causes the circulation damper to retract into the bottom of the upper groove, opening the circulation vent. When the electric telescopic rod extends, it pushes the electric telescopic rod out from the bottom of the upper groove, closing the circulation vent.

[0009] Furthermore, the cold air supply assembly includes a cold air outlet, a damper motor, a door hinge, and a cold air damper. Two cold air outlets are located on the top side of the heating chamber. A damper motor is installed on one side of each cold air outlet. The output shaft of the damper motor is fixedly connected to the end of the door hinge, and the door hinge is fixedly connected to the middle of the cold air damper. The damper motor drives the door hinge to rotate, which in turn drives the cold air damper to rotate. When the cold air damper is in a vertical position, it can close the cold air outlet; when the cold air damper is in a horizontal position, it can open the cold air outlet.

[0010] Furthermore, it also includes a decentralized air supply mechanism, which comprises branch ducts, vertical ducts, solenoid valves, and decentralized air supply components for the smoke-filling chamber. The heating exhaust duct is connected to one end of the branch duct, and the other end of the branch duct is connected to the vertical duct. The upper and lower ends of the vertical duct are respectively connected to two decentralized air supply components for the smoke-filling chamber via two solenoid valves. Opening the solenoid valves allows hot air from the heating exhaust duct to be introduced into the branch ducts and vertical ducts, and then evenly distributed into the upper and lower layers of the smoke-filling chamber via the decentralized air supply components.

[0011] Furthermore, the smoke-filling chamber's distributed air supply assembly includes distributed air ducts and distributed outlets. The upper and lower ends of the vertical air duct are connected to two distributed air ducts via two solenoid valves. The two distributed air ducts are installed on the upper and lower sides of the smoke-filling chamber, respectively. Multiple distributed outlets are equidistantly arranged on the side of each distributed air duct. Hot air in the vertical air duct enters the distributed air duct through the solenoid valves and is then delivered into the smoke-filling chamber through the distributed outlets. This increases the air temperature inside the smoke-filling chamber. Controlling the two solenoid valves allows for the separate supply of hot air to the upper or lower layers of the smoke-filling chamber, balancing the temperature between the upper and lower layers and reducing temperature differences. The distributed outlets also reduce low-temperature dead zones.

[0012] Furthermore, the system also includes a controller and temperature and humidity sensors. Temperature and humidity sensors are installed on the upper and lower sides of the smoke loading chamber, respectively. A controller is installed on the outside of the smoke loading chamber, and the input terminal of the controller is electrically connected to the output terminal of the temperature and humidity sensors. The temperature and humidity sensors are used to detect the temperature and humidity of the upper and lower layers inside the smoke loading chamber and transmit the detection data to the controller through a circuit. The controller is used to control the operation of the fan, heater, electric telescopic rod, damper motor, and solenoid valve, thereby facilitating intelligent control of the temperature and humidity inside the smoke loading chamber.

[0013] Compared with existing technologies, the beneficial effects of this intelligent control system for reducing temperature differences in the drying oven are: 1. The intelligent control system for reducing the temperature difference in the drying room has a circulation control mechanism that opens the circulating air vents, a cold air supply component that seals the top of the vertical air duct, a heater that heats the air at the bottom of the vertical air duct, and then a fan that blows air downwards to allow the hot air at the bottom of the vertical air duct to enter the heating exhaust duct. The hot air then enters the smoke loading chamber through two exhaust channels at the top and bottom of the heating exhaust duct, raising the base temperature inside the smoke loading chamber. The air guiding control mechanism can be used to seal the exhaust channels or guide the hot air discharged from the exhaust channels, allowing the discharged hot air to be discharged at different pitch angles, so that the hot air is evenly distributed in the smoke loading chamber.

[0014] 2. The intelligent control system for reducing temperature difference in the tobacco curing barn can close the exhaust duct at the top of the heating exhaust duct by means of an air guide control mechanism when the temperature of the upper and lower layers of the tobacco loading chamber is not uniform, such as when the temperature of the upper layer of the tobacco loading chamber is higher than that of the lower layer. This allows hot air to be discharged only from the exhaust duct at the bottom of the heating exhaust duct, which helps to increase the temperature of the lower layer of the tobacco loading chamber and balance the temperature of the upper and lower layers of the tobacco curing barn, thereby improving the quality of the tobacco curing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This utility model Figure 1 A magnified view of the structure at point A in the middle; Figure 3 This is a schematic cross-sectional view of the present invention. Figure 4 This utility model Figure 3 A magnified schematic diagram of the structure at point B in the middle; Figure 5 This is a schematic diagram of the air guide control mechanism in this utility model; In the diagram: 1. Smoke chamber; 2. Dehumidification assembly; 21. Dehumidification outlet; 22. Louver; 3. Heating chamber; 4. Cold air supply assembly; 41. Cold air outlet; 42. Air damper motor; 43. Door hinge; 44. Cold air damper; 5. Air inlet; 6. Temperature difference control mechanism; 61. Vertical air duct; 62. Heating exhaust duct; 63. Fan; 64. Heater; 65. Circulating air outlet; 7. Circulation control mechanism; 71. Upper groove; 72. Electric telescopic rod; 73. Circulating air damper; 8. Air guide control mechanism; 81. Rectangular frame; 82. Rotating shaft; 83. Air guide control plate; 84. Bevel gear one; 85. Bevel gear two; 86. Control shaft; 87. Control motor; 88. Control slot; 9. Distributed air supply mechanism; 91. Branch air duct; 92. Vertical air duct; 93. Solenoid valve; 94. Distributed air duct; 95. Distributed outlet; 10. Air inlet door; 11. Controller; 12. Temperature and humidity sensor. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example 1, please refer to Figures 1 to 5 This utility model provides a technical solution: an intelligent control system for reducing the temperature difference in a tobacco curing barn, including a tobacco loading chamber 1, a heating chamber 3 located in the middle of the right side of the tobacco loading chamber 1, an air inlet 5 located at the bottom of the heating chamber 3, an air inlet door 10 installed in the air inlet 5, and the air inlet 5 communicating with the inside of the tobacco loading chamber 1, and also includes a dehumidification component 2, a temperature difference control mechanism 6 and a cold air supply component 4.

[0018] The dehumidification component 2 is installed on the top side of the smoke chamber 1.

[0019] The dehumidification assembly 2 includes a dehumidification port 21 and louvers 22. The dehumidification port 21 is located on the top side of the tobacco loading chamber 1, and the louvers 22 are installed inside the dehumidification port 21. The dehumidification port 21 is used to expel humid air from the tobacco loading chamber 1, promoting continuous drying of the tobacco leaves inside the tobacco loading chamber 1. The louvers 22 prevent external debris from entering the tobacco loading chamber 1 through the dehumidification port 21, while not affecting the expulsion of humid air.

[0020] The temperature difference control mechanism 6 includes a vertical air duct 61, a heating exhaust duct 62, a fan 63, a heater 64, and a circulating air outlet 65. The vertical air duct 61 is located in the middle of the heating chamber 3, and the heating exhaust duct 62 is located on the right side of the smoke chamber 1. The bottom of the vertical air duct 61 is connected to the bottom of the heating exhaust duct 62. The upper and lower ends of the heating exhaust duct 62 are connected to the smoke chamber 1 through two exhaust channels. Each exhaust channel is equipped with a guide air control mechanism 8. The top left side of the vertical air duct 61 is connected to the smoke chamber 1 through the circulating air outlet 65. The circulating air outlet 65 is equipped with a circulation control mechanism 7. The fan 63 is installed in the middle of the vertical air duct 61 with the air outlet facing downward. The heater 64 is installed at the bottom of the vertical air duct 61.

[0021] The air guide control mechanism 8 includes a rectangular frame 81, a rotating shaft 82, an air guide control plate 83, a control plate synchronous flipping control component, and a control slot 88. A rectangular frame 81 is installed in each exhaust duct. A control slot 88 is opened on the rear side of the rectangular frame 81. Multiple vertically arranged rotating shafts 82 are rotatably connected at equal intervals in the rectangular frame 81. Specifically, there are four rotating shafts 82 in each rectangular frame 81. Each rotating shaft 82 is fixedly connected to the middle of the air guide control plate 83. The rear end of each rotating shaft 82 extends into the control slot 88 and is connected to the control plate synchronous flipping control component.

[0022] The synchronous flipping control assembly of the control board includes a first bevel gear 84, a second bevel gear 85, a control shaft 86, and a control motor 87. The rear ends of each rotating shaft 82 extend into the control slot 88 and are fixedly connected to the first bevel gear 84. The control motor 87 is installed at the bottom of the control slot 88. The output shaft at the top of the control motor 87 is fixedly connected to the bottom end of the control shaft 86. The top end of the control shaft 86 is rotatably connected to the top of the control slot 88 through a bearing. The second bevel gear 85 is fixedly sleeved on the control shaft 86 at the position corresponding to each first bevel gear 84. The second bevel gear 85 meshes with the corresponding first bevel gear 84. When the control motor 87 works, it drives the control shaft 86 to rotate, thereby driving each second bevel gear 85 to rotate. Then, the meshing action of the second bevel gear 85 and the first bevel gear 84 drives the rotating shaft 82 and the air guide control plate 83 to rotate.

[0023] The control panel synchronous flip control component is used to synchronously drive the rotation of each shaft 82 within a rectangular frame 81, thereby driving the air guide control plate 83 to rotate. When the end of the air guide control plate 83 closest to the smoke chamber 1 swings upward, it can guide the hot air passing through the rectangular frame 81 upward. When the end of the air guide control plate 83 closest to the smoke chamber 1 swings downward, it can guide the hot air passing through the rectangular frame 81 downward. This can change the direction of the hot air entering the smoke chamber 1, promote the uniform distribution of hot air in the smoke chamber 1, and reduce the temperature difference between the upper and lower layers in the smoke chamber 1. When all the air guide control plates 83 are in the vertical state, the air guide control plates 83 close the inner side of the rectangular frame 81, and hot air can no longer pass through the exhaust duct here, thereby achieving the closed control of the exhaust duct.

[0024] The circulation control mechanism 7 includes an upper groove 71, an electric telescopic rod 72, and a circulation damper 73. The upper groove 71 is located at the top of the circulation vent 65. The top of the upper groove 71 is fixedly connected to the top of the electric telescopic rod 72, and the bottom of the electric telescopic rod 72 is fixedly connected to the top center of the circulation damper 73. When the electric telescopic rod 72 shortens, it causes the circulation damper 73 to retract into the bottom of the upper groove 71, opening the circulation vent 65. When the electric telescopic rod 72 extends, it pushes the electric telescopic rod 72 out from the bottom of the upper groove 71, closing the circulation vent 65.

[0025] The cold air supply component 4 is installed on the heating chamber 3 and is connected to the top of the vertical air duct 61.

[0026] The cold air supply assembly 4 includes a cold air outlet 41, a damper motor 42, a door hinge 43, and a cold air damper 44. Two cold air outlets 41 are located on the top side of the heating chamber 3. A damper motor 42 is installed on one side of each cold air outlet 41. The output shaft of the damper motor 42 is fixedly connected to the end of the door hinge 43, and the door hinge 43 is fixedly connected to the middle of the cold air damper 44. The damper motor 42 drives the door hinge 43 to rotate, which in turn drives the cold air damper 44 to rotate. When the cold air damper 44 is in a vertical position, it can close the cold air outlet 41; when the cold air damper 44 is in a horizontal position, it can open the cold air outlet 41.

[0027] In use, a loading door is provided at the rear of the loading chamber 1, through which tobacco leaves can be loaded or removed. A rack is provided inside the loading chamber 1 for placing the tobacco leaves to be cured. The tobacco leaves are placed on the rack inside the loading chamber 1. The heating chamber 3 is used to install the temperature difference control mechanism 6. During the actual curing process, the circulation control mechanism 7 opens the circulation air vent 65, the cold air supply component 4 closes the top of the vertical air duct 61, the heater 64 works first to heat the air at the bottom of the vertical air duct 61, and then the fan 63 blows air downwards, allowing the hot air at the bottom of the vertical air duct 61 to enter the heating exhaust duct 62, and then enter the loading chamber 1 through the two exhaust channels at the upper and lower ends of the heating exhaust duct 62, raising the base temperature inside the loading chamber 1. The air guide control mechanism 8 can be used to close the exhaust channels or guide the hot air discharged from the exhaust channels, allowing the discharged hot air to be discharged at different pitch angles, so that the hot air is evenly distributed in the loading chamber 1. When the temperature of the upper and lower layers in the smoke chamber 1 is not uniform, for example, when the temperature of the upper layer in the smoke chamber 1 is higher than that of the lower layer, the exhaust channel at the upper end of the heating exhaust duct 62 is sealed by the air guide control mechanism 8, and the hot air is discharged only from the exhaust channel at the lower end of the heating exhaust duct 62, which helps to increase the temperature of the lower layer in the smoke chamber 1. When the overall temperature inside the smoke chamber 1 is too high, the heater 64 stops working, the cold air supply component 4 opens the top of the vertical air duct 61, and the fan 63 blows air downwards, which can introduce some cold air from the outside into the smoke chamber 1 to reduce the overall temperature inside the smoke chamber 1. When the humidity inside the tobacco loading chamber 1 increases, the circulation control mechanism 7 closes the circulation vent 65, the heater 64 continues to work, the cold air supply component 4 opens the top of the vertical air duct 61, and the fan 63 blows air downwards, which can introduce dry air from outside. After heating, the air is sent into the tobacco loading chamber 1, allowing the humid air inside the tobacco loading chamber 1 to be discharged through the dehumidification component 2. While maintaining the tobacco loading chamber 1 at a suitable baking temperature, the humidity of the internal air is reduced, which promotes the drying of the tobacco leaves.

[0028] Internal circulation tobacco curing mode: The circulation control mechanism 7 opens the circulation vent 65, the cold air supply component 4 closes the top of the vertical air duct 61, the heater 64 works to heat the air at the bottom of the vertical air duct 61, and then the fan 63 blows air downwards, allowing the hot air at the bottom of the vertical air duct 61 to enter the heated exhaust duct 62, and then enter the tobacco loading chamber 1 through the two exhaust channels at the upper and lower ends of the heated exhaust duct 62.

[0029] External circulation tobacco curing mode: The circulation control mechanism 7 closes the circulation air outlet 65, the cold air supply component 4 opens the top of the vertical air duct 61, the heater 64 works to heat the air at the bottom of the vertical air duct 61, and then the fan 63 blows air downwards to allow the hot air at the bottom of the vertical air duct 61 to enter the heated exhaust duct 62, and then enter the tobacco loading chamber 1 through the two exhaust channels at the upper and lower ends of the heated exhaust duct 62.

[0030] Most of the time, the internal circulation tobacco curing mode is used, and a small amount of time the external circulation tobacco curing mode is used.

[0031] Example 2, please refer to Figures 1 to 5 This utility model provides a technical solution: an intelligent control system for reducing temperature differences in drying rooms. This embodiment is structurally similar to Embodiment 1, with the difference being: A decentralized air supply mechanism 9 is also provided, which includes a branch air duct 91, a vertical air duct 92, a solenoid valve 93, and a decentralized air supply assembly for the smoke-filling chamber. The heating exhaust duct 62 is connected to one end of the branch air duct 91, and the other end of the branch air duct 91 is connected to the vertical air duct 92. The upper and lower ends of the vertical air duct 92 are respectively connected to two decentralized air supply assemblies for the smoke-filling chamber through two solenoid valves 93. When the solenoid valve 93 is opened, the hot air in the heating exhaust duct 62 can be introduced into the branch air duct 91 and the vertical air duct 92, and then evenly distributed into the upper and lower layers of the smoke-filling chamber 1 through the decentralized air supply assembly for the smoke-filling chamber.

[0032] The smoke-filling chamber's distributed air supply assembly includes distributed air ducts 94 and distributed air inlets 95. The upper and lower ends of the vertical air duct 92 are connected to two distributed air ducts 94 via two solenoid valves 93. The two distributed air ducts 94 are installed on the upper and lower sides of the smoke-filling chamber 1, respectively. Each distributed air duct 94 has multiple distributed air inlets 95 evenly spaced on its side. The number of distributed air inlets 95 can be selected according to actual needs, but generally, each distributed air duct 94 has no fewer than six distributed air inlets 95. Hot air in the vertical air duct 92 enters the distributed air duct 94 through the solenoid valves 93, and then is delivered into the smoke-filling chamber 1 through the distributed air inlets 95. This increases the air temperature inside the smoke-filling chamber 1. By controlling the two solenoid valves 93, hot air can be supplied to the upper or lower layers of the smoke-filling chamber 1, balancing the temperature between the upper and lower layers and reducing temperature differences. The distributed air inlets 95 also reduce low-temperature dead zones.

[0033] The system also includes a controller 11 and a temperature and humidity sensor 12. Temperature and humidity sensors 12 are installed on the upper and lower sides of the smoke-loading chamber 1, respectively, while the controller 11 is installed on the outer side of the smoke-loading chamber 1. The input terminal of the controller 11 is electrically connected to the output terminal of the temperature and humidity sensor 12. The temperature and humidity sensor 12 is used to detect the temperature and humidity of the upper and lower layers within the smoke-loading chamber 1 and transmits the detection data to the controller 11 via a circuit. The controller 11 is used to control the operation of the fan 63, heater 64, electric telescopic rod 72, damper motor 42, solenoid valve 93, and control motor 87. The controller 11 facilitates intelligent control of the temperature and humidity within the smoke-loading chamber 1.

[0034] It should be noted that the controller 11 is a PLC controller. The controller 11 controls the operation of the fan 63, heater 64, electric telescopic rod 72, damper motor 42, solenoid valve 93 and control motor 87 using existing technology. Both damper motor 42 and control motor 87 are servo motors. The connection between temperature and humidity sensor 12 and controller 11 uses existing technology.

[0035] The basic idea behind this intelligent control system for reducing temperature differences in the drying oven is as follows: (1) Based on the previous test results, the stage with a large temperature difference between the upper and lower sheds of the drying room is the yellowing period. Therefore, the hot air is only guided to change direction by the air guide control mechanism 8 when the temperature of the control shed is ≤45℃ (set temperature value). After entering the color setting period, the air guide control mechanism 8 stops working and only the fan 63 is used to maintain the positive airflow circulation.

[0036] (2) Based on the previous test results, if the temperature and humidity sensor at a fixed position collects data, it will cause the temperature of the other shed to rise sharply after the turn. Therefore, this method changes the control shed to change with the direction of the air guide control mechanism 8.

[0037] (3) By collecting the temperatures of the upper and lower sheds, the temperature of the controlled shed is n degrees Celsius higher than that of the uncontrolled shed. After maintaining the temperature at n degrees Celsius higher for m minutes, the air guide control mechanism 8 guides the hot air to change direction.

[0038] (4) In order to enhance the dehumidification performance of the oven after reversal, two cold air supply components 4 are installed on the side of the heating chamber.

[0039] (5) The fan 63 can further control the air volume by changing the frequency.

[0040] (6) An IoT module was added to the controller 11 to better obtain temperature and humidity information in the oven.

[0041] System control logic: When the system is stopped, the fan will only rotate in the forward direction, and other peripheral equipment will stop working.

[0042] During system operation (including ignition), the non-controllable cooling damper will remain closed, the fan will rotate forward first, and the controllable cooling damper will operate normally according to humidity changes. When using a frequency converter, the converter will display rotation information and frequency.

[0043] The benefits of this intelligent control system for reducing temperature differences in the drying oven are: 1. This technical solution, through conducting bidirectional circulation experiments with fans, not only significantly reduced the temperature difference between the upper and lower chambers of the baking oven, but also systematically obtained multi-dimensional process parameters and accumulated a large number of reliable experimental data clusters, providing a scientific basis for optimizing the actual baking process.

[0044] 2. It innovatively adopts an intelligent logic control strategy, based on the temperature gradient change characteristics within the three-dimensional space of the baking oven, to realize an adaptive adjustment mechanism for the fan direction, effectively maintaining the uniform distribution of the heat field inside the baking oven, and breaking through the temperature control bottleneck of traditional baking processes.

[0045] 3. By upgrading the automatic control system through programming and coupling frequency conversion control technology, a fully automated temperature difference control system for the drying room was successfully constructed. This achieved the optimal balance between the economy of equipment modification and operational efficiency without requiring modifications to the main equipment architecture such as the automatic control system.

[0046] 4. The intelligent system constructed in this invention collects data through temperature and humidity recorders in the upper and lower chambers, and adjusts the direction of the fans according to the autonomously adjustable temperature difference, thereby reducing the problem of large spatial differences in temperature and humidity distribution in the curing barn. The autonomously adjustable temperature difference can be flexibly applied to the curing of tobacco leaves from different parts, at different temperature ranges, and with different qualities of fresh tobacco leaves.

[0047] 5. Unlike previous inventions, this invention refines the timing of switching control chambers. If the control chamber is switched directly during shutdown, the heating chamber will overheat due to the lower temperature of the non-control chamber, causing a sharp rise in temperature in the control chamber when the fan starts running. However, switching the control chamber when the fan is restarted after shutdown results in a gentler temperature change, which helps stabilize the temperature and humidity inside the drying oven.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 process, method, article, or apparatus.

[0049] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An intelligent control system for reducing temperature difference in a tobacco curing barn, comprising a tobacco loading chamber (1), wherein a heating chamber (3) is provided in the middle of the right side of the tobacco loading chamber (1), and an air inlet (5) is provided at the bottom of the heating chamber (3), the air inlet (5) being connected to the interior of the tobacco loading chamber (1), characterized in that, Also includes: A dehumidification component (2) is installed on the top side of the smoke chamber (1); The temperature difference control mechanism (6) includes a vertical air duct (61), a heating exhaust duct (62), a fan (63), a heater (64), and a circulating air outlet (65). The vertical air duct (61) is provided in the middle of the heating chamber (3), and the heating exhaust duct (62) is provided on the right side of the smoke chamber (1). The bottom of the vertical air duct (61) is connected to the bottom of the heating exhaust duct (62). The upper and lower ends of the heating exhaust duct (62) are connected to the smoke chamber (1) through two exhaust channels. Each exhaust channel is equipped with a wind guide control mechanism (8). The top left side of the vertical air duct (61) is connected to the smoke chamber (1) through a circulating air outlet (65). A circulation control mechanism (7) is installed in the circulating air outlet (65). A fan (63) is installed in the middle of the vertical air duct (61), and a heater (64) is installed at the bottom of the vertical air duct (61). A cold air supply assembly (4) is installed on the heating chamber (3), and the cold air supply assembly (4) is connected to the top of the vertical air duct (61).

2. The intelligent control system for reducing temperature difference in a drying oven according to claim 1, characterized in that: The dehumidification assembly (2) includes a dehumidification port (21) and a louver (22). The top side of the smoke chamber (1) is provided with a dehumidification port (21) and a louver (22) is installed inside the dehumidification port (21).

3. The intelligent control system for reducing temperature difference in a drying oven according to claim 1, characterized in that: The air guide control mechanism (8) includes a rectangular frame (81), a rotating shaft (82), an air guide control plate (83), a control plate synchronous flip control component, and a control slot (88). A rectangular frame (81) is installed in each exhaust duct. A control slot (88) is opened on the rear side of the rectangular frame (81). Multiple vertically arranged rotating shafts (82) are rotatably connected at equal distances in the rectangular frame (81). Each rotating shaft (82) is fixedly connected to the middle part of the air guide control plate (83). The rear end of each rotating shaft (82) extends into the control slot (88) and is connected to the control plate synchronous flip control component.

4. The intelligent control system for reducing temperature difference in a drying oven according to claim 1, characterized in that: The circulation control mechanism (7) includes an upper groove (71), an electric telescopic rod (72), and a circulation damper (73). The upper groove (71) is provided at the top of the circulation air outlet (65). The top of the upper groove (71) is fixedly connected to the top of the electric telescopic rod (72), and the bottom of the electric telescopic rod (72) is fixedly connected to the top center of the circulation damper (73).

5. The intelligent control system for reducing temperature difference in a drying oven according to claim 1, characterized in that: The cold air supply assembly (4) includes a cold air outlet (41), a damper motor (42), a door hinge (43), and a cold air door (44). Two cold air outlets (41) are opened on the top side of the heating chamber (3). A damper motor (42) is installed on one side of each cold air outlet (41). The output shaft of the damper motor (42) is fixedly connected to the end of the door hinge (43), and the door hinge (43) is fixedly connected to the middle of the cold air door (44).

6. The intelligent control system for reducing temperature difference in a drying oven according to claim 1, characterized in that: It also includes a distributed air supply mechanism (9), which includes a branch air duct (91), a vertical air duct (92), a solenoid valve (93) and a smoke chamber distributed air supply assembly. The heating exhaust duct (62) is connected to one end of the branch air duct (91), and the other end of the branch air duct (91) is connected to the vertical air duct (92). The upper and lower ends of the vertical air duct (92) are respectively connected to two smoke chamber distributed air supply assemblies through two solenoid valves (93).

7. The intelligent control system for reducing temperature difference in a drying oven according to claim 6, characterized in that: The smoke chamber distributed air supply assembly includes a distributed air duct (94) and a distributed outlet (95). The upper and lower ends of the vertical air duct (92) are connected to two distributed air ducts (94) through two solenoid valves (93). The two distributed air ducts (94) are installed on the upper and lower sides of the smoke chamber (1) respectively. Each distributed air duct (94) has multiple distributed outlets (95) arranged at equal intervals on its side.

8. The intelligent control system for reducing temperature difference in a drying oven according to claim 1, characterized in that: It also includes a controller (11) and a temperature and humidity sensor (12). Temperature and humidity sensors (12) are installed on the upper and lower sides of the smoke chamber (1), respectively. A controller (11) is installed on the outside of the smoke chamber (1). The input end of the controller (11) is electrically connected to the output end of the temperature and humidity sensor (12).

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