A heat pump tobacco leaf intensive curing room with alternating airflow operation

Abstract

The present invention belongs to the technical field of tobacco leaf baking, and specifically relates to a heat pump tobacco leaf intensive baking room with alternating airflow operation, which utilizes an air source heat pump as a main heat source and an auxiliary heating wire for auxiliary heating, generates a heat source in a heating chamber, and the heat source is blown into an air inlet duct by a fan, and under the switching of an alternating switching device, realizes automatic switching of an upward air circulation and a downward air circulation, and can use the upper and lower temperature differences in the tobacco loading chamber and a delay device as a starting signal for the switching, and sets different switching durations according to different periods of tobacco leaf baking, so as to avoid tobacco leaves at the same position being in the upstream or downstream of the airflow during the entire baking period, so as to keep the dehydration speed and yellowing degree of tobacco leaves in the upper and lower shelves relatively consistent, and effectively solves the problems of different yellowing and dehydration speeds of tobacco leaves in the existing equipment and processes, and difficulty in balancing the baking quality of tobacco leaves in the upper and lower shelves, and the present invention has low cost and high energy utilization, and has huge economic, environmental and social benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco leaf baking, and in particular relates to a heat pump tobacco leaf intensive baking room with alternating airflow operation. Background Art

[0002] Tobacco leaf baking is a key link in tobacco production. The baking quality of tobacco leaves is directly related to the flavor and grade of cigarettes. The intensive tobacco leaf baking room is the carrier of tobacco leaf baking technology and is crucial to ensuring the baking quality of tobacco leaves.

[0003] At present, my country's intensive tobacco curing rooms have two types: rising airflow and falling airflow. Both use circulating fans to force ventilation in the curing room, sucking dry and cold air in the environment into the heating chamber, sending it to the loading room after heating, and bringing the water vapor evaporated from the tobacco leaves into the environment, thus completing the baking of the tobacco leaves in this cycle. During the baking process, the tobacco leaves gradually turn yellow and dehydrate, which has the advantages of large tobacco loading capacity and energy saving.

[0004] However, the flow direction of the airflow relative to the tobacco leaves in the existing flue-curing rooms is ascending or descending. For the descending airflow flue-curing room, the temperature decreases and the humidity increases as the airflow passes through the tobacco layer from top to bottom; the ascending airflow flue-curing room also has the phenomenon of uneven temperature and humidity in the upper and lower sheds, and the gradient of change is opposite to that of the descending type. The unidirectional circulation of the airflow makes the dehydration speed and yellowing degree of the tobacco leaves upstream of the airflow greater than that of the downstream tobacco leaves, resulting in inconsistent grades of the baked tobacco leaves in the upper and lower sheds, and it is easy for the upstream tobacco leaves to turn brown or the downstream tobacco leaves to turn yellow insufficiently. A single airflow circulation can no longer meet people's needs. Therefore, it is necessary to study a heat pump tobacco intensive flue-curing room with alternating airflow operation. Summary of the invention

[0005] In view of the defects and problems existing in the existing equipment, the present invention provides a heat pump tobacco intensive curing room with alternating airflow operation, which effectively solves the problem that the single airflow circulation in the existing equipment easily causes the grade of the baked tobacco leaves in the upper and lower sheds to be inconsistent, and the tobacco leaves upstream of the airflow to turn brown or the tobacco leaves downstream of the airflow to turn yellow insufficiently.

[0006] The solution adopted by the present invention to solve its technical problems is: a heat pump tobacco intensive curing room with alternating airflow, comprising a tobacco loading chamber, a heating chamber, an alternating switching device and a control system; the heating chamber comprises a condenser, an air source heat pump, an auxiliary heating wire and a fan; the air source heat pump is arranged outside the heating chamber; a partition and a baffle are arranged between the heating chamber and the tobacco loading chamber, the upper and lower ends of the partition and the baffle correspond to the upper and lower side walls of the tobacco loading chamber to form an upper air inlet and a lower air inlet, the partition and the baffle are arranged at intervals to form an air inlet, a bracket is arranged between the heating chamber and the partition, the condenser and the heating wire are vertically arranged on the bracket to form a heating body, the fan is arranged in the middle of the partition, its air inlet faces the heating body, and the air outlet faces the air inlet, the alternating switching device comprises a fixing plate, a switching plate and a driving device The fixed plate is arranged on the upper and lower sides of the heating chamber and is arranged at intervals on the outside of the partition, so that a return air duct is formed between the fixed plate and the partition, the switching plate includes a sealing plate located at the inner section and a hollow plate located at the outer section, the partition and the fixed plate are provided with corresponding sliding holes, the switching plate is correspondingly sleeved in the sliding holes, the driving device is arranged at the outer end of the switching plate, and can drive the switching plate to slide horizontally in the sliding hole, so that the sealing plate can close the air inlet duct or the return air duct, and when the sealing plate closes the air inlet duct, the hollow plate opens the return air duct; a dehumidification valve and a fresh air valve are also arranged in the heating chamber; the control system includes a driver and a controller, the driver sends a control command to the controller, and the controller controls the driving device, the fan, the air source heat pump, the fresh air valve and the dehumidification valve to work.

[0007] Furthermore, the driver includes a delay device, a temperature sensor and a humidity sensor; the temperature sensor is arranged at the upper and lower parts of the smoke loading chamber, and forms a temperature signal according to the temperature difference between the upper and lower parts; the humidity sensor is arranged in the heating chamber, and generates a humidity signal according to the humidity in the heating chamber; the delay device is arranged in or outside the heating chamber, and generates a delay signal for each time period according to the set working time; the temperature signal and the delay signal are used to control the operation of the electric push rod, and the humidity signal is used to control the operation of the dehumidification valve and the fresh air valve.

[0008] Furthermore, sealing plates are provided on the upper and lower sides of the bracket, and the sealing plates wrap the air inlet end of the fan, the auxiliary heating wire and the condenser to form a heating air duct.

[0009] Furthermore, the blocking plate is an arc-shaped structure or a straight-line structure.

[0010] Furthermore, the driving device includes an upper electric push rod located at the upper part and a lower electric push rod at the lower part. The upper electric push rod and the lower electric push rod are respectively controlled by the controller to perform asynchronous actions, so that the upper air outlet and the lower return air outlet are opened to form a downward air circulation loop, or the lower air outlet and the upper return air outlet are opened to form an upward air circulation loop.

[0011] Furthermore, the interval time between alternating upward and downward airflow is: low temperature, humidity and yellowing period: two airflow operation modes, 1h interval, rotate once; stable temperature, moisture removal and color fixing period: two airflow operation modes, 2h interval, rotate once; temperature, humidity control and drying period: two airflow operation modes, 4h interval, rotate once.

[0012] Furthermore, the upper electric push rod and the lower electric push rod are respectively controlled by the controller, and the upper electric push rod and the lower electric push rod move synchronously, the upper air outlet and the lower air outlet are closed at the same time, and an air valve is arranged in the middle of the baffle. The air valve is controlled by a motor to flip the valve plate inside it, and the motor is connected to the controller.

[0013] Furthermore, the end of the electric push rod is fixed on the side wall of the heating chamber, an auxiliary frame is extended on the bracket, and the cylinder body of the electric push rod is fixed on the auxiliary frame.

[0014] Furthermore, the driving device includes a driving motor, a screw, an upper screw sleeve, a lower screw and a connecting rod. A connecting rod is connected between the end of the upper switching plate and the upper screw sleeve, and a connecting rod is connected between the lower switching plate and the lower screw sleeve. Thread segments with opposite thread directions are arranged at the front and rear ends of the screw. The driving motor is transmission-connected to the screw, and the upper screw sleeve and the lower screw sleeve are correspondingly threadedly connected to the two thread segments with opposite threads.

[0015] Furthermore, a sealing pad is provided at the end of the sealing section of the switching plate.

[0016] Beneficial effects of the invention: The present invention aims at the defects existing in the existing structure. A single air flow circulation easily causes inconsistent grades of tobacco leaves baked in the upper and lower sheds. Based on this, the present invention provides a heat pump tobacco intensive curing room with alternating airflow operation. Specifically, a heating chamber, a smoke loading chamber, an alternating switching device and a control system are arranged in the curing room, wherein two partitions and baffles arranged at intervals are arranged between the heating chamber and the smoke loading chamber, and an air inlet duct is formed. A fan is used to apply horizontal air supply in the middle of the partition to generate hot air in the air inlet duct, and the upper and lower ends of the air inlet duct are asynchronously opened by the alternating switching device, and the corresponding return air outlets, that is, the upper air outlet and the lower return air outlet are opened at the same time to form a downward air circulation loop, or the lower air outlet and the upper return air outlet are opened to form an upward air circulation loop, and under the control of the controller, the downward air circulation loop and the upward air circulation loop can be operated alternately.

[0017] In the process of generating hot air, the present invention is a circulating heating structure, and the waste heat can be returned to the heating chamber from the return air port for reuse. A dehumidification valve is arranged in the heating chamber to regularly discharge moisture to the outside, and a fresh air valve is used to regularly replenish air so that the gas circulation can operate benignly.

[0018] At the same time, the heating channel in the present invention is a closed channel, thereby preventing hot air from scattering in the heating chamber, improving the utilization rate of hot air, and avoiding the influence of hot air at the return air outlet on the return air, so that the heating chamber outside the heating channel is in a relatively low pressure state, which is convenient for gas circulation.

[0019] When switching the switch board, the present invention provides two methods:

[0020] The first method uses an electric push rod for driving control, so that the upper switch plate and the lower switch plate can be controlled separately, and three working modes are provided for this method, the first is the upward air circulation mode, the second is the downward air circulation mode, and the third is the central air supply circulation mode;

[0021] The second method uses a drive motor for drive control so that the upper switching plate and the lower switching plate can be asynchronously controlled, and two working modes are provided for this method, one is the upward wind circulation mode, and the other is the downward wind circulation mode; thus, the above two methods can both realize the alternating operation of the upward wind and downward wind circulation.

[0022] Therefore, the present invention utilizes an air source heat pump as the main heat source and an auxiliary heating wire for auxiliary heating, generates a heat source in the heating chamber, and the heat source is blown into the air inlet duct by the fan, and under the switching of the alternating switching device, the automatic switching of the upward air circulation and the downward air circulation is realized. The switching can be based on the upper and lower temperature differences in the tobacco loading chamber and the delay device as the starting signal, and different switching durations are set according to the different periods of tobacco leaf baking, so as to avoid tobacco leaves at the same position being in the upstream or downstream of the airflow during the entire baking time period, so that the dehydration speed and yellowing degree of the tobacco leaves in the upper and lower sheds remain relatively consistent, effectively solving the problems of different yellowing and dehydration speeds of tobacco leaves in the existing equipment and processes, and the difficulty in balancing the baking quality of tobacco leaves in the upper and lower sheds. The present invention has low cost, high energy utilization, and huge economic, environmental and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 Schematic diagram of the upward wind circulation airflow structure.

[0025] Figure 3 Schematic diagram of the downwind circulation airflow structure.

[0026] Figure 4 Another structural schematic diagram of the present invention.

[0027] Figure 5 It is a side view of the present invention.

[0028] Figure 6 Another structural schematic diagram of the driving device.

[0029] Figure 7 It is a schematic structural diagram of another embodiment of the present invention.

[0030] The numbers in the figure are: 1 is a smoke chamber, 2 is a heating chamber, 3 is a baffle, 4 is a partition, 5 is a fixed plate, 6 is an air inlet, 7 is an upper air outlet, 8 is a lower air outlet, 9 is an upper return air outlet, 10 is a lower return air outlet, 11 is a blocking plate, 12 is a heating channel, 13 is a switching plate, 131 is an upper switching plate, 132 is a lower switching plate, 133 is a sealing plate, 134 is a hollow plate, 14 is a fan, 15 is an air source heat pump, 16 is a condenser, 17 is a heating wire, 18 is an upper dehumidification valve, 19 is a fresh air valve, 20 is a lower dehumidification valve, 21 is a connecting rod, 22 is an upper screw sleeve, 23 is a screw, 24 is a lower screw sleeve, 25 is a driving motor, 26 is an electric push rod, and 27 is an air valve. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0032] Embodiment 1: This embodiment aims to provide a heat pump tobacco leaf intensive curing barn with alternating airflow operation, mainly to address the defects existing in the existing single airflow circulation, which easily causes tobacco leaves to turn yellow and dehydrate at different speeds, and it is difficult to balance the baking quality of tobacco leaves in the upper and lower sheds. This embodiment provides a heat pump tobacco leaf intensive curing barn with multiple airflow circulations alternatingly operating.

[0033] like Figure 1-5 As shown in the figure, this embodiment mainly provides a heat pump tobacco intensive curing room with alternating airflow operation, specifically including a tobacco loading chamber 1, a heating chamber 2, an alternating switching device and a control system; wherein a horizontal rack is provided in the tobacco loading chamber 1, and tobacco leaves are hung on the rack, which occupies the main area of ​​the curing room, and the heating chamber 2 includes a condenser 16, an air source heat pump 15, an auxiliary heating wire 17 and a fan 14; the air source heat pump 15 is arranged outside the heating chamber 2, and is connected to the condenser 16 through a pipeline to form a heating system, and the heating wire 17 is used for auxiliary heating. This is an existing structure and is not described in detail.

[0034] A partition 4 and a baffle 3 are arranged between the heating chamber 2 and the smoke loading chamber 1. Specifically, the partition 4 and the baffle 3 are parallel to the lightweight insulation partition board, and the two sides are fixed on the side walls of the baking room. The upper and lower ends are spaced apart from the bottom and top surfaces of the baking room, so that the upper and lower ends of the partition 4 and the baffle 3 correspond to the upper and lower side walls of the smoke loading chamber to form an upper air outlet 7 and a lower air outlet 8. The partition 4 and the baffle 3 are spaced apart to form an air inlet 6. In this embodiment, the air inlet 6 is a vertical channel. In order to support the equipment, a bracket is arranged between the heating chamber 2 and the partition 4. The condenser 16 and the heating wire 17 are vertically arranged on the bracket to form a heating body. The fan 14 is arranged in the middle of the partition 4, with its air inlet facing the heating body and its air outlet facing the air inlet, so that the hot air generated is directly output by the fan to the air inlet 6.

[0035] In order to realize the air flow switching in the air inlet duct 6, the alternating switching device in this embodiment includes a fixed plate 5, a switching plate 13 and a driving device. The fixed plate 5 is arranged on the upper and lower sides of the heating chamber 2, and is arranged at intervals on the outer side of the partition 4, so as to form a return air duct between the fixed plate 5 and the partition 4. The switching plate 13 includes a sealing plate 133 located in the inner section and a hollow plate 134 located in the outer section. The sealing plate 133 is a solid plate, and its size matches the air inlet duct and the return air duct. The hollow plate 134 can allow return air to pass through.

[0036] In order to enable the switching plate to switch back and forth, corresponding sliding holes are provided on the partition plate 4 and the fixed plate 5, and the switching plate 13 is correspondingly sleeved in the sliding holes. The driving device is provided at the outer end of the switching plate 13, and can drive the switching plate to slide horizontally in the sliding hole, so that the sealing plate can close the air inlet or the return air duct, and when the sealing plate 133 closes the air inlet, the hollow plate 134 opens the return air duct; so that only one of the air inlet and return air duct on a single side can be opened, a sealing pad is provided at the end of the sealing section of the switching plate, and when the sealing pad seals the air inlet, it touches the side wall of the baffle, and can also serve as a limiter to touch the partition, having the function of sealing and limiting the switching plate 13.

[0037] In addition, in this embodiment, a dehumidification valve and a fresh air valve 19 are also provided in the heating chamber. The dehumidification valve is provided with an upper dehumidification valve 18 and a lower dehumidification valve 20, which are respectively located on both sides. The fresh air valve 20 is arranged in the middle. When the gas is circulating, the air enters the heating chamber from the fresh air valve. After being heated by the heating body, the hot air is input into the smoke loading chamber by the fan. The hot air transfers heat to the tobacco leaves and takes away moisture from the leaves. Part of the humid air is discharged from the upper dehumidification valve, and part of it returns to the heating chamber from the upper air port. The working principle of the downward airflow type is similar to that of the upward airflow type, but the airflow direction is opposite.

[0038] The control system includes a driver and a controller. The driver sends a control command to the controller, and the controller controls the operation of the driving device, the fan 14, the air source heat pump 15, the fresh air valve 19 and the dehumidification valve. The specific driver includes a delay device, a temperature sensor and a humidity sensor. Two temperature sensors are provided and are respectively fixedly installed on the upper and lower parts of the smoke loading chamber 1, and a temperature signal is formed according to the upper and lower temperature differences in the smoke loading chamber 1; the humidity sensor is arranged in the heating chamber 2, and a humidity signal is generated according to the humidity in the heating chamber 2; the delay device is arranged in or outside the heating chamber 2, and a delay signal for each time period is generated according to the set working time; the temperature signal and the delay signal are used to control the operation of the driving device, and the humidity signal is used to control the operation of the dehumidification valve and the fresh air valve.

[0039] In this embodiment, the driving device includes an upper electric push rod located at the upper part and a lower electric push rod at the lower part. The upper electric push rod and the lower electric push rod are respectively controlled by the controller to perform asynchronous actions, so that the upper air outlet 7 and the lower return air outlet 10 are opened to form a downward air circulation loop, or the lower air outlet 8 and the upper return air outlet 9 are opened to form an upward air circulation loop.

[0040] In specific implementation, the interval time between alternating upward and downward airflow is: low temperature, humidity and yellowing period: two airflow operation modes, 1h interval, rotate once; stable temperature, dehumidification and color fixing period: two airflow operation modes, 2h interval, rotate once; temperature control, humidity control and drying period: two airflow operation modes, 4h interval, rotate once. The alternating operation time and interval length are adjusted according to different periods, and the upper and lower temperature difference thresholds are set in the corresponding period. When the upper and lower temperature difference exceeds the threshold, an alarm will be issued and the cycle mode will be switched in advance.

[0041] Therefore, in this embodiment, a heating chamber, a smoke loading chamber, an alternating switching device and a control system are arranged in the curing room, and a fan is used to apply horizontal air supply in the middle of the air inlet duct to generate hot air in the air inlet duct, and the upper and lower ends of the air inlet duct are asynchronously opened by the alternating switching device, and at the same time, the corresponding return air outlets, that is, the upper air outlet and the lower return air outlet are opened to form a downward air circulation loop, or the lower air outlet and the upper return air outlet are opened to form an upward air circulation loop, and under the control of the controller, the downward air circulation loop and the upward air circulation loop can be operated alternately to avoid tobacco leaves at the same position being in the upstream or downstream of the airflow during the entire baking time period, so that the dehydration speed and yellowing degree of the tobacco leaves in the upper and lower sheds remain relatively consistent.

[0042] Embodiment 2: This embodiment is basically the same as Embodiment 1, except that this embodiment further describes the heating air duct.

[0043] The upper and lower sides of the bracket are provided with blocking plates 11, which wrap the air inlet end of the fan 14, the auxiliary heating wire 17 and the condenser 16 to form a heating air duct 12; Figure 1-3As shown in FIG, the blocking plate 11 is an arc-shaped structure or a straight-line structure.

[0044] The heating channel 12 of this embodiment is a closed channel, which prevents hot air from scattering in the heating chamber 2, improves the utilization rate of the hot air, and avoids the influence of hot air on the return air at the return air outlet, so that the heating chamber outside the heating channel is in a relatively low pressure state, which is convenient for gas circulation.

[0045] Embodiment 3: This embodiment is basically the same as Embodiment 1, except that: this embodiment adds a middle circulating air circuit.

[0046] In this embodiment, the upper electric push rod and the lower electric push rod are respectively controlled by the controller, and the upper electric push rod and the lower electric push rod move synchronously, the upper air outlet 7 and the lower air outlet 8 are closed at the same time, and a wind valve 27 is arranged in the middle of the baffle. The wind valve 27 is controlled by a motor to flip the valve plate inside it. This is an existing structure and is not described in detail. The motor is connected to the controller.

[0047] Therefore, this embodiment adds a middle circulation loop on the basis of Embodiment 1, supplies heat from the middle and returns air from the upper and lower ends; the embodiment has three working modes, the first is the upward air circulation mode, the second is the downward air circulation mode, and the third is the central air supply circulation mode.

[0048] Embodiment 4: This embodiment is basically the same as Embodiment 1, except that this embodiment provides a driving device with another structure.

[0049] This embodiment provides another structure of a driving device for asynchronously driving the switching board. Figure 6 As shown, it specifically includes a driving motor 25, a screw 23, an upper screw sleeve 22, a lower screw 24 and a connecting rod 21. The connecting rod 21 is connected between the end of the upper switching plate 131 and the upper screw sleeve 22, and the connecting rod is connected between the lower switching plate 132 and the lower screw sleeve 24. The front and rear ends of the screw 23 are provided with thread segments with opposite thread directions. The driving motor is connected to the screw in a transmission manner, and the upper screw sleeve and the lower screw sleeve are correspondingly threadedly connected to the two thread segments with opposite threads.

[0050] Therefore, in this embodiment, a single drive motor 25 can be used to realize asynchronous linkage between the upper switching plate 131 and the lower switching plate 132, thereby realizing automatic switching between the upward air circulation loop and the downward air circulation loop.

Claims

1. A heat pump tobacco leaf intensive curing barn with alternating airflow, characterized in that: The invention comprises a smoke loading chamber, a heating chamber, an alternating switching device and a control system; the heating chamber comprises a condenser, an air source heat pump, an auxiliary heating wire and a fan; the air source heat pump is arranged outside the heating chamber; a partition and a baffle are arranged between the heating chamber and the smoke loading chamber, the upper and lower ends of the partition and the baffle correspond to the upper and lower side walls of the smoke loading chamber to form an upper air inlet and a lower air inlet, the partition and the baffle are arranged at intervals to form an air inlet, a bracket is arranged between the heating chamber and the partition, the condenser and the heating wire are arranged vertically on the bracket to form a heating body, the fan is arranged in the middle of the partition, its air inlet faces the heating body, and the air outlet faces the air inlet, the alternating switching device comprises a fixed plate, a switching plate and a driving device, the fixed plate is arranged on the upper and lower sides of the heating chamber, and is arranged at intervals on the outside of the partition, so as to form a return air duct between the fixed plate and the partition, the switching plate comprises a sealing plate located in the inner section and a hollow plate located in the outer section, the partition and the fixed plate are provided with corresponding sliding holes, the switching plate is correspondingly sleeved in the sliding hole, the driving device is arranged at the outer end of the switching plate, and can The driving switching plate slides horizontally in the sliding hole so that the sealing plate can close the air inlet or the return air duct, and when the sealing plate closes the air inlet, the hollow plate opens the return air duct; a dehumidification valve and a fresh air valve are also provided in the heating chamber; the control system includes a driver and a controller, the driver sends a control command to the controller, and the controller controls the driving device, the fan, the air source heat pump, the fresh air valve and the dehumidification valve to work, and the driver includes a delay device, a temperature sensor and a humidity sensor; the temperature sensor is arranged at the upper and lower parts of the smoke loading chamber, and forms a temperature signal according to the upper and lower temperature difference; the humidity sensor is arranged in the heating chamber, and generates a humidity signal according to the humidity in the heating chamber; the delay device is arranged in the heating chamber or outside, and generates a delay signal for each time period according to the set working time; the temperature signal and the delay signal are used to control the operation of the electric push rod, and the humidity signal is used to control the operation of the dehumidification valve and the fresh air valve, and the upper and lower sides of the bracket are provided with sealing plates, which wrap the air inlet end of the fan, the auxiliary heating wire and the condenser to form a heating air duct.

2. The heat pump tobacco leaf intensive curing barn with alternating airflow according to claim 1 is characterized in that: The blocking plate is an arc-shaped structure or a straight-line structure.

3. The heat pump tobacco leaf intensive curing barn with alternating airflow according to claim 1 is characterized in that: The driving device includes an upper electric push rod at the top and a lower electric push rod at the bottom. The upper electric push rod and the lower electric push rod are respectively controlled by a controller to perform asynchronous actions, so that the upper air outlet and the lower return air outlet are opened to form a downward air circulation loop, or the lower air outlet and the upper return air outlet are opened to form an upward air circulation loop.

4. The heat pump tobacco leaf intensive curing barn with alternating airflow operation according to claim 3, characterized in that: The interval time between alternating upward and downward airflow is: low temperature, humidity control and yellowing period: two airflow operation modes, 1h interval, rotate once; stable temperature, moisture removal and color fixing period: two airflow operation modes, 2h interval, rotate once; temperature control, humidity control and drying period: two airflow operation modes, 4h interval, rotate once.

5. The heat pump tobacco leaf intensive curing barn with alternating airflow according to claim 3 is characterized in that: The upper electric push rod and the lower electric push rod are respectively controlled by the controller, and the upper electric push rod and the lower electric push rod move synchronously, the upper air outlet and the lower air outlet are closed at the same time, and an air valve is arranged in the middle of the baffle. The air valve is controlled by a motor to flip the valve plate inside the air valve, and the motor is connected to the controller.

6. The heat pump tobacco leaf intensive curing barn with alternating airflow according to claim 3, characterized in that: The end of the electric push rod is fixed on the side wall of the heating chamber, an auxiliary frame is extended on the bracket, and the cylinder body of the electric push rod is fixed on the auxiliary frame.

7. The heat pump tobacco leaf intensive curing barn with alternating airflow according to claim 1, characterized in that: The driving device includes a driving motor, a screw, an upper screw sleeve, a lower screw and a connecting rod. A connecting rod is connected between the end of the upper switching plate and the upper screw sleeve, and a connecting rod is connected between the lower switching plate and the lower screw sleeve. The front and rear ends of the screw are provided with thread segments with opposite thread directions. The driving motor is connected to the screw in a transmission manner, and the upper screw sleeve and the lower screw sleeve are correspondingly threadedly connected to the two thread segments with opposite thread directions.

8. The heat pump tobacco leaf intensive curing barn with alternating airflow according to claim 1, characterized in that: A sealing pad is provided at the end of the sealing section of the switching plate.

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