A regulating system and control method for loose conditioning machine hot air temperature stabilization

Abstract

This invention discloses a control method for a hot air temperature stabilization adjustment system in a loosening and rehumidifying machine. The adjustment system includes a signal acquisition and input module, a PID control module, and a control signal execution module. Three different control logic automatic hot air temperature adjustment programs are programmed using a PLC. In adjustment mode three, the fresh air temperature transmitter is set to activate fresh air adjustment only when the input hot air temperature exceeds the upper and lower limits of the set value. This invention's hot air temperature stabilization adjustment system for loosening and rehumidifying machines offers three different automatic hot air temperature adjustment modes with varying control logics. Different adjustment modes can be switched according to the specific needs, allowing for targeted matching of appropriate adjustment modes and enriching the control program for the hot air temperature of the loosening and rehumidifying machine.

Description

Technical Field

[0001] This invention relates to the field of cigarette processing equipment and processing technology, specifically to a regulating system and control method for stabilizing the hot air temperature of a loosening and rehumidifying machine. Background Technology

[0002] The loosening and rehumidifying machine is an important piece of equipment in the tobacco processing line. Its technological task is to change the physical properties of tobacco leaves, loosen the leaves, and increase the moisture content and temperature of the sliced ​​tobacco, thereby improving the processing resistance and sensory quality of the tobacco. Hot air temperature is an important process indicator in the loosening and rehumidifying process and a key factor in ensuring the quality of tobacco products. Fluctuations in hot air temperature will affect the re-permeability, outlet moisture content, and temperature, thus directly affecting the processing and sensory quality of the tobacco leaves.

[0003] like Figure 2 As shown, the temperature regulation of the hot air in the loosening and rehumidifying machine mainly relies on the heat exchanger installed in the hot air duct to heat the circulating air for temperature control. Its automatic regulation principle is as follows: a platinum resistance thermometer installed in the duct measures the temperature inside the pipeline, and then transmits the temperature signal to a temperature transmitter in the electrical control cabinet. The temperature transmitter compares the temperature information with the set value and then transmits an electrical signal to an electrical converter. The electrical converter then converts it into a pneumatic signal, which in turn controls the opening of the pneumatic diaphragm regulating valve on the steam pipeline to regulate the amount of steam entering the heat exchanger, thereby achieving the purpose of temperature control (e.g., ...). Figure 2 (As shown). However, this adjustment mode has a fatal flaw: because heat conduction in the heat exchanger has a certain thermal inertia and hysteresis during the adjustment process, the temperature rises slowly. When the set value is reached, the temperature will continue to rise due to thermal inertia. When the hot air temperature adjusts from high to low towards the set value, the heat loss accumulated in the cylinder or drum has a lag, and the hot air temperature drops for a long time, causing fluctuations in the hot air temperature. This easily leads to situations where the hot air temperature at the material head is too high, the batch curve fluctuates greatly, and the CPK value of the hot air temperature process is difficult to achieve. When changing batches, the non-steady-state duration of the hot air temperature is too long, affecting production efficiency and increasing energy consumption.

[0004] like Figure 1 , 3 As shown, currently, both the TBL series and WQ series loose air rehumidifiers produced by a certain company are designed with a fresh air bypass (such as...). Figure 1As shown), this is used to supplement high-temperature, dry fresh air into the circulating air system. While ensuring the material is loose, it not only increases the initial temperature of the hot air, avoiding the thermal inertia and hysteresis problems of the hot air temperature heat exchanger, but also further reduces the fluctuation amplitude of the hot air temperature during regulation, shortens the duration of unsteady state, and improves the stability of the hot air temperature process. Furthermore, it can regulate the humidity of the hot air, mitigating the impact of impurities carried by the circulating air. Its basic regulation principle is the same as described above; the fresh air temperature control and hot air temperature control logic are independent of each other, requiring a given fresh air setpoint (such as...). Figure 3 (As shown). However, this adjustment mode also has obvious shortcomings. First, since the fresh air temperature adjustment and hot air temperature adjustment operate independently, the amount of steam used will be further increased to maintain the stability of the fresh air temperature, thus increasing the energy consumption of the equipment. Second, the fresh air will not only remove the grassy and impurities in the circulating air, but also take away the aroma of the tobacco leaves, reducing the aroma quality of the loose tobacco leaves. Third, the fresh air temperature needs to be set manually, the adjustment mode is not intelligent enough, and it also increases the potential quality risks. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a regulating system and control method for stabilizing the hot air temperature of a loosening and rehumidifying machine. The regulating system for stabilizing the hot air temperature of the loosening and rehumidifying machine has three different automatic hot air temperature regulating modes with different control logics to choose from. Different regulating modes can be switched according to the needs and priorities, and the corresponding regulating modes can be matched in a targeted manner, thus enriching the control program of the hot air temperature of the loosening and rehumidifying machine.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A control method for a regulating system for stabilizing the hot air temperature of a loosening and rehumidifying machine. The regulating system includes a hot air duct heat exchanger (1), a circulating air duct (2), a fresh air duct (3), a circulating air opening controller (4), a fresh air duct heat exchanger (5), a fresh air opening controller (6), a hot air duct (7), a hot air fan (8), a circulating air temperature sensor (9), a fresh air temperature sensor (10), and a hot air temperature sensor (11). One end of the hot air duct is connected to the hot air duct heat exchanger, and the other end is connected to the hot air fan. A hot air temperature sensor is installed on the outlet pipe of the hot air fan. The other end of the hot air duct heat exchanger is connected to the circulating air duct and the fresh air duct via branch pipes. A circulating air opening controller and a circulating air temperature sensor are installed on the circulating air duct. A fresh air duct heat exchanger, a fresh air opening controller, a fresh air temperature sensor, and a hot air temperature sensor are installed on the fresh air duct.

[0008] The system is characterized by the following features: the control system further includes a signal acquisition and input module, a PID control module, and a control signal execution module. The signal acquisition and input module includes temperature sensors and transmitters for the hot air and fresh air duct outlets. The transmitters convert the acquired data into deviations from the set values ​​and feed them back to the PID control module. The PID control module includes hot air temperature PID controllers and fresh air temperature PID controllers. Its function is to output correction signals to the control signal execution module through PID controllers to convert the data deviation feedback signals. The control signal execution module includes an electrical converter, which converts electrical signals into gas signals to control the heater steam valve and adjust the heater heating power. The three modules together form a basic closed-loop control logic for controlling the hot air and fresh air temperatures. Three different automatic hot air temperature control programs with different control logics are programmed using a PLC. In control mode three, the fresh air temperature transmitter is set to start fresh air control only when the input hot air temperature information exceeds the upper and lower limits of the set value.

[0009] Furthermore, the control method includes: Regulation Mode 3: Input hot air temperature setpoint. The hot air temperature in the pipeline is measured by a platinum resistance thermometer installed on the air duct. The hot air temperature signal is then transmitted to the hot air temperature transmitter and the fresh air temperature transmitter in the electrical control cabinet. The hot air temperature transmitter compares the hot air temperature information with the setpoint and transmits the hot air temperature electrical signal to the hot air temperature electrical converter. The fresh air temperature transmitter is set to start the fresh air regulation only if the input hot air temperature information exceeds the upper and lower limits of the setpoint; otherwise, the fresh air regulation is turned off. The corresponding electrical converter receives the electrical signal from the corresponding temperature transmitter and converts it into a gas signal, which then controls the opening of the pneumatic diaphragm regulating valve on the corresponding steam pipeline to regulate the amount of steam entering the corresponding heat exchanger, thereby achieving the purpose of controlling the hot air temperature and the fresh air temperature. In this mode, the fresh air regulation process is a conditional supplementary regulation to the hot air regulation process, forming a closed-loop regulation logic. The fresh air will only participate in the regulation when the hot air temperature deviates significantly, increasing the initial temperature of the hot air. This not only reduces the adjustment of the hot air temperature heat exchanger.

[0010] Furthermore, the control method includes: Adjustment mode one: Input the hot air temperature setpoint, the hot air temperature in the pipeline is measured by the platinum resistance thermometer installed on the air duct, and then the temperature signal is transmitted to the temperature transmitter in the electrical control cabinet. The temperature transmitter compares the temperature information with the setpoint and then transmits the electrical signal to the electrical converter. The electrical converter then converts it into a pneumatic signal, which in turn controls the opening of the pneumatic diaphragm regulating valve on the steam pipeline to regulate the amount of steam entering the heat exchanger, thereby achieving the purpose of controlling the hot air temperature, and finally forming an adjustment logic closed loop.

[0011] Furthermore, the control method includes: Adjustment Mode 2: Input hot air temperature setpoint and fresh air temperature setpoint. The hot air temperature and fresh air temperature in the pipeline are measured by a platinum resistance thermometer installed on the corresponding air duct. The corresponding temperature signal is then transmitted to the corresponding temperature transmitter in the electrical control cabinet. The corresponding temperature transmitter compares the temperature information with the corresponding temperature setpoint and transmits the electrical signal to the electrical converter. The electrical converter then converts the electrical signal into a pneumatic signal, which in turn controls the opening of the pneumatic diaphragm regulating valve on the corresponding steam pipeline to adjust the amount of steam entering the corresponding heat exchanger, thereby achieving the purpose of controlling the hot air temperature and fresh air temperature. Finally, two independent adjustment logic closed loops are formed. The fresh air is only mixed into the circulating air as high-temperature drying air to increase the initial temperature of the hot air, thereby reducing the adjustment process of the hot air temperature heat exchanger and improving the stability of the hot air temperature.

[0012] Furthermore, in adjustment mode three: (a) when the hot air temperature exceeds the upper and lower limits of the set value, and the temperature inside the drum of the loosening and dehumidifying machine is greater than the preset temperature; start the fresh air adjustment and control the fresh air duct heat exchanger to operate at the first power; (b) when the hot air temperature exceeds the upper and lower limits of the set value, and the temperature inside the drum of the loosening and dehumidifying machine is equal to the preset temperature; start the fresh air adjustment and control the fresh air duct heat exchanger to operate at the second power; (c) when the hot air temperature exceeds the upper and lower limits of the set value, and the temperature inside the drum of the loosening and dehumidifying machine is less than the preset temperature; start the fresh air adjustment and control the fresh air duct heat exchanger to operate at the third power; wherein, the third power > the second power > the first power.

[0013] Furthermore, for high-grade tobacco flakes with stable raw material formulas, minimal differences in moisture content, and low levels of green and impurity odors, a loosening and rehumidification process is performed, and the hot air temperature is adjusted using mode one. For tobacco flakes with significant differences in raw material formulas resulting in uneven moisture retention and specific heat capacity, and with older tobacco leaves and higher levels of green and impurity odors, a loosening and rehumidification process is performed, and the hot air temperature is adjusted using mode two. To enhance the intelligence and automation of the loosening and rehumidification machine and reduce manual intervention, the hot air temperature is adjusted using mode three.

[0014] The present invention provides a regulating system and control method for stabilizing the hot air temperature of a loosening and rehumidifying machine, which has the following advantages over traditional hot air temperature regulating systems for loosening and rehumidifying machines:

[0015] (1) The hot air temperature regulation system of the loosening and rehumidifying machine of the present invention has three different control logics for the hot air temperature automatic regulation mode to choose from. Different regulation modes can be switched according to the needs and priorities, and the corresponding regulation modes can be matched in a targeted manner, which enriches the control program of the hot air temperature of the loosening and rehumidifying machine.

[0016] (2) For high-grade tobacco flakes with stable raw material formula, small differences in grade moisture content, and low content of green and impurity aromas, the loosening and rehumidification process can be carried out by switching to adjustment mode one to adjust the hot air temperature, which can effectively preserve the original aroma of the tobacco leaves and prevent aroma loss; For tobacco flakes with large differences in raw material formula grade, resulting in uneven water retention and specific heat capacity, and with high age and green and impurity aroma content, the loosening and rehumidification process can be carried out by switching to adjustment mode two to adjust the hot air temperature, which can not only effectively avoid thermal inertia and lag in the hot air temperature heat exchanger adjustment process caused by unstable raw materials. To address the issue of temperature fluctuations, this method further reduces the amplitude of hot air temperature fluctuations during the adjustment process, shortens the duration of unsteady states, and improves the stability of the hot air temperature process. It also regulates the humidity of the hot air, reducing the impact of the recirculated green and impurity gases on the aroma and quality of the tobacco leaves. In response to the requirements for improving the intelligence and automation of the loosening and rehumidifying machine, and with reduced manual intervention, the adjustment mode three can be switched to regulate the hot air temperature. This not only achieves the goal of preserving the original aroma of the tobacco leaves and improving the stability of the hot air temperature during processing, but also achieves energy saving, consumption reduction, and improved production efficiency. Attached Figure Description

[0017] Figure 1 A schematic diagram of the hot air temperature regulation pipeline distribution structure for a loosening and rehumidifying machine, based on existing technology or the present invention.

[0018] Figure 2 This is a schematic diagram of a control method for switching the hot air temperature to adjustment mode one, which is either an existing technology or the present invention.

[0019] Figure 3 This is a schematic diagram of the control method for switching the hot air temperature to adjustment mode two, which is either an existing technology or the present invention.

[0020] Figure 4 This is a schematic diagram of the control method for switching the hot air temperature to adjustment mode three according to the present invention.

[0021] Figure 5 This is a schematic diagram of the overall control method of the hot air temperature regulation system of the present invention.

[0022] In the diagram: 1. Hot air duct heat exchanger; 2. Circulating air duct; 3. Fresh air duct; 4. Circulating air opening controller; 5. Fresh air duct heat exchanger; 6. Fresh air opening controller; 7. Hot air duct; 8. Hot air fan; 9. Circulating air temperature sensor; 10. Fresh air temperature sensor; 11. Hot air temperature sensor. Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The present invention will now be described in further detail with reference to the accompanying drawings.

[0025] like Figure 1-5 As shown, a control method for a regulating system for stabilizing the hot air temperature of a loosening and rehumidifying machine is disclosed. The regulating system includes a hot air duct heat exchanger 1, a circulating air duct 2, a fresh air duct 3, a circulating air opening controller 4, a fresh air duct heat exchanger 5, a fresh air opening controller 6, a hot air duct 7, a hot air fan 8, a circulating air temperature sensor 9, a fresh air temperature sensor 10, and a hot air temperature sensor 11. One end of the hot air duct 7 is connected to the hot air duct heat exchanger 1, and the other end is connected to the hot air fan 8. A hot air temperature sensor 11 is installed on the outlet pipe of the hot air fan 8. The other end of the hot air duct heat exchanger 1 is connected to the circulating air duct 2 and the fresh air duct 3 respectively via a branch pipe (T-junction). The circulating air duct 2 is equipped with a circulating air opening controller 4 and a circulating air temperature sensor 9, and the fresh air duct 3 is equipped with a fresh air duct heat exchanger 5, a fresh air opening controller 6, a fresh air temperature sensor 10, and a hot air temperature sensor 11. The system is characterized by further including a signal... The system comprises an input acquisition module, a PID control module, and a control signal execution module. The input acquisition module includes temperature sensors and transmitters for the hot air and fresh air duct outlets. Its function is to collect real-time temperature data from the temperature sensors, convert the collected data into deviations from the set values ​​via the transmitters, and feed this data back to the PID control module. The PID control module includes PID controllers for both hot air and fresh air temperatures. Its function is to output correction signals to the control signal execution module based on the data deviation feedback signals. The control signal execution module includes an electrical converter, which converts electrical signals into gas signals to control the heater's steam valve and adjust the heater's heating power. These three modules together form a basic closed-loop control logic for the hot air and fresh air temperatures. Three different automatic hot air temperature control programs with varying control logics are programmed using a PLC. In control mode three, the fresh air temperature transmitter is set to only initiate fresh air control if the input hot air temperature exceeds the upper or lower limits of the set value.

[0026] The regulating system mainly includes a hot air duct section, a circulating air duct section, and a fresh air duct section. The hot air inside the cylinder or drum of the loosening and rehumidifying machine flows back through the circulating air outlet at the discharge end and enters the circulating air duct 2. The circulating air volume is regulated by the circulating air opening controller 4. The fresh air is obtained from the outside natural air, which is heated to the programmed temperature by the heat exchanger 5 in the fresh air duct and enters the fresh air duct 3. The fresh air volume is regulated by the fresh air opening controller 6. The circulating air and fresh air are mixed to form hot air, which enters the heat exchanger 1 in the hot air duct and is heated to the set hot air temperature. The hot air is then sent to the feed end of the drum of the loosening and rehumidifying machine by the centrifugal blower 8 through the hot air duct 7. The circulating air temperature sensor 9, the fresh air temperature sensor 10, and the hot air temperature sensor 11 are distributed in the corresponding ducts to collect temperature data in real time.

[0027] Furthermore, the control method includes: Regulation Mode 3: A hot air temperature setpoint is input. The hot air temperature in the pipeline is measured by a platinum resistance thermometer installed on the duct. The hot air temperature signal is then transmitted to the hot air temperature transmitter and the fresh air temperature transmitter in the electrical control cabinet. The hot air temperature transmitter compares the hot air temperature information with the setpoint and transmits the hot air temperature electrical signal to the hot air temperature electrical converter. The fresh air temperature transmitter is set to start the fresh air regulation only if the input hot air temperature exceeds the upper or lower limit of the setpoint; otherwise, the fresh air regulation is shut down (e.g., the fresh air regulation program only runs when the temperature exceeds ±3℃ or 5℃ of the setpoint, and the fresh air damper and the steam diaphragm valve of the fresh air heat exchanger open). The corresponding electrical converter receives the electrical signal from the corresponding temperature transmitter and converts it into a pneumatic signal, which then controls the opening of the pneumatic diaphragm regulating valve on the corresponding steam pipeline to regulate the amount of steam entering the corresponding heat exchanger, thereby controlling the hot air temperature and the fresh air temperature. In this mode, the fresh air regulation process serves as a conditional supplementary regulation to the hot air regulation process, forming a closed-loop regulation logic (e.g., ...). Figure 4 As shown, fresh air will only participate in the regulation when the hot air temperature deviates significantly, thereby increasing the initial temperature of the hot air. This not only reduces the adjustment process of the hot air temperature heat exchanger and improves the stability of the hot air temperature, but also avoids the fresh air temperature regulation being in a continuous state, thus saving energy.

[0028] Regulation Mode 1: The hot air temperature setpoint is input. A platinum resistance thermometer installed on the duct measures the hot air temperature within the pipeline and transmits the temperature signal to a temperature transmitter in the electrical control cabinet. The temperature transmitter compares the temperature information with the setpoint and transmits an electrical signal to an electrical converter. The electrical converter then converts this signal into a pneumatic signal, which controls the opening of the pneumatic diaphragm regulating valve on the steam pipeline to regulate the amount of steam entering the heat exchanger, thereby controlling the hot air temperature. This ultimately forms a closed-loop regulation logic (e.g., ...). Figure 2 (As shown).

[0029] Adjustment Mode Two: Input hot air temperature setpoints and fresh air temperature setpoints. A platinum resistance thermometer installed on the corresponding air duct measures the hot air and fresh air temperatures within the pipeline. The corresponding temperature signals are then transmitted to the corresponding temperature transmitters in the electrical control cabinet. These transmitters compare the temperature information with the setpoints and transmit an electrical signal to an electrical converter. The electrical converter then converts this signal into a pneumatic signal, which controls the opening of the pneumatic diaphragm regulating valve on the corresponding steam pipeline to adjust the amount of steam entering the corresponding heat exchanger. This achieves the purpose of controlling the hot air and fresh air temperatures, ultimately forming two independent closed-loop adjustment logics (e.g., ...). Figure 3 As shown, the fresh air is only mixed with the high-temperature drying air to supplement the circulating air, thereby increasing the initial temperature of the hot air, reducing the adjustment process of the hot air temperature heat exchanger, and improving the stability of the hot air temperature.

[0030] In adjustment mode three: (a) when the hot air temperature exceeds the upper and lower limits of the set value, and the temperature inside the cylinder or drum of the loosening and rehumidifying machine is greater than the preset temperature; start the fresh air adjustment and control the fresh air duct heat exchanger 5 to operate at the first power; (b) when the hot air temperature exceeds the upper and lower limits of the set value, and the temperature inside the cylinder or drum of the loosening and rehumidifying machine is equal to the preset temperature; start the fresh air adjustment and control the fresh air duct heat exchanger to operate at the second power; (c) when the hot air temperature exceeds the upper and lower limits of the set value, and the temperature inside the cylinder or drum of the loosening and rehumidifying machine is less than the preset temperature; start the fresh air adjustment and control the fresh air duct heat exchanger to operate at the third power. In one embodiment, the third power > the second power > the first power. This can further reduce the fluctuation amplitude of the hot air temperature during the adjustment process, shorten the duration of the unsteady state, improve the stability of the hot air temperature process, and also adjust the humidity of the hot air, reduce the impact of the backflow of the green and impurity gases carried by the circulating air on the aroma quality of the tobacco leaves, and save energy.

[0031] The present invention provides a regulating system and control method for stabilizing the hot air temperature of a loosening and rehumidifying machine, which has the following advantages over traditional hot air temperature regulating systems for loosening and rehumidifying machines:

[0032] (1) The hot air temperature regulation system of the loosening and rehumidifying machine of the present invention has three different control logics for the hot air temperature automatic regulation mode to choose from. Different regulation modes can be switched according to the needs and priorities, and the corresponding regulation modes can be matched in a targeted manner, which enriches the control program of the hot air temperature of the loosening and rehumidifying machine.

[0033] (2) For high-grade tobacco flakes with stable raw material formula, small differences in grade moisture content, and low content of green and impurity aromas, the loosening and rehumidification process can be carried out by switching to adjustment mode one to adjust the hot air temperature, which can effectively preserve the original aroma of the tobacco leaves and prevent aroma loss; For tobacco flakes with large differences in raw material formula grade, resulting in uneven water retention and specific heat capacity, and with high age and green and impurity aroma content, the loosening and rehumidification process can be carried out by switching to adjustment mode two to adjust the hot air temperature, which can not only effectively avoid thermal inertia and lag in the hot air temperature heat exchanger adjustment process caused by unstable raw materials. To address the issue of temperature fluctuations, this method further reduces the amplitude of hot air temperature fluctuations during the adjustment process, shortens the duration of unsteady states, and improves the stability of the hot air temperature process. It also regulates the humidity of the hot air, reducing the impact of the recirculated green and impurity gases on the aroma and quality of the tobacco leaves. In response to the requirements for improving the intelligence and automation of the loosening and rehumidifying machine, and with reduced manual intervention, the adjustment mode three can be switched to regulate the hot air temperature. This not only achieves the goal of preserving the original aroma of the tobacco leaves and improving the stability of the hot air temperature during processing, but also achieves energy saving, consumption reduction, and improved production efficiency.

[0034] It should be noted that all directional indicators (such as up, down, left, right, front, back, horizontal, vertical, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly. The "connection" can be a direct connection or an indirect connection. The "set", "set in", and "set at" can be a direct setting or an indirect setting.

[0035] The above embodiments are illustrative of the present invention and not intended to limit the invention. It is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A control method for a loose conditioning machine hot air temperature stable adjustment system, the adjustment system comprising a hot air pipeline heat exchanger (1), a circulating air pipeline (2), a fresh air pipeline (3), a circulating air opening controller (4), a fresh air pipeline heat exchanger (5), a fresh air opening controller (6), a hot air pipeline (7), a hot air fan (8), a circulating air temperature sensor (9), a fresh air temperature sensor (10), a hot air temperature sensor (11), one end of the hot air pipeline being connected with the hot air pipeline heat exchanger, the other end being connected with the hot air fan, the hot air fan outlet pipeline being provided with the hot air temperature sensor, the other end of the hot air pipeline heat exchanger being connected with the circulating air pipeline and the fresh air pipeline through branch pipes, the circulating air pipeline being provided with the circulating air opening controller and the circulating air temperature sensor, the fresh air pipeline being provided with the fresh air pipeline heat exchanger, the fresh air opening controller and the fresh air temperature sensor; characterized in that The adjustment system further comprises a signal acquisition input module, a PID adjustment module and an adjustment signal execution module, the signal acquisition input module comprising temperature sensors and transmitters at the hot air and fresh air duct outlets, the transmitters converting the collected data into deviation from the set value and feeding back to the PID adjustment module; the PID adjustment module comprising a hot air temperature PID regulator and a fresh air temperature PID regulator, which corrects the data deviation feedback signal through PID output to the adjustment signal execution module; the adjustment signal execution module comprising an electrical converter, which converts the electrical signal into a pneumatic signal to control the pneumatic diaphragm regulating valve opening on the steam pipeline to regulate the steam flow into the heat exchanger and the power of the heat exchanger; the three modules together constitute the basic adjustment logic closed loop for controlling the hot air temperature and the fresh air temperature; three different control logic hot air temperature automatic adjustment programs are programmed through PLC; in adjustment mode three, the fresh air temperature transmitter sets the input hot air temperature information to exceed the upper and lower limits of the set value to start running the fresh air adjustment, In adjustment mode three: (a) when the hot air temperature information exceeds the upper and lower limits of the set value, and the temperature in the loose conditioning machine drum is greater than the preset temperature; start running the fresh air adjustment to control the fresh air pipeline heat exchanger to run at the first power; (b) when the hot air temperature information exceeds the upper and lower limits of the set value, and the temperature in the loose conditioning machine drum is equal to the preset temperature; start running the fresh air adjustment to control the fresh air pipeline heat exchanger to run at the second power; (c) when the hot air temperature information exceeds the upper and lower limits of the set value, and the temperature in the loose conditioning machine drum is less than the preset temperature; start running the fresh air adjustment to control the fresh air pipeline heat exchanger to run at the third power; wherein the third power > the second power > the first power.

2. A control method for a conditioning system for loose conditioning machine hot air temperature stabilization as defined in claim 1, wherein, The control method comprises: adjusting mode three: inputting the hot air temperature set value, measuring the hot air temperature in the pipeline by the platinum resistance installed on the air duct, then transmitting the hot air temperature signal to the hot air temperature transmitter and the fresh air temperature transmitter in the electric control cabinet respectively, comparing the hot air temperature information with the set value of the hot air temperature by the hot air temperature transmitter, then transmitting the hot air temperature electric signal to the hot air temperature electrical converter, and setting the input hot air temperature information to exceed the upper and lower limits of the set value to start the operation of the fresh air regulation, otherwise the fresh air regulation is closed, and the corresponding electrical converter converts the corresponding temperature transmitter electric signal into a gas signal, then controls the opening degree of the pneumatic diaphragm regulating valve on the corresponding steam pipeline to regulate the steam quantity into the corresponding heat exchanger, so as to control the hot air temperature and the fresh air temperature, the fresh air regulation process in this mode is a conditional supplementary regulation of the hot air regulation process, and the two are parallel to form a regulation logic closed loop, the fresh air only participates in the regulation under the condition that the hot air temperature deviates greatly, and the initial temperature of the hot air is improved.

3. A control method for a conditioning system for loose conditioning machine hot air temperature stabilization as defined in claim 2, wherein, The control method comprises: adjusting mode one: inputting the hot air temperature set value, measuring the hot air temperature in the pipeline by the platinum resistance installed on the air duct, then transmitting the temperature signal to the temperature transmitter in the electric control cabinet, comparing the temperature information with the set value by the temperature transmitter, then transmitting the electric signal to the electrical converter, converting the electrical converter into a gas signal, then controlling the opening degree of the pneumatic diaphragm regulating valve on the steam pipeline to regulate the steam quantity into the heat exchanger, so as to control the hot air temperature, and finally forming a regulation logic closed loop.

4. A control method for a conditioning system for loose conditioning machine hot air temperature stabilization as defined in claim 3, wherein, The control method comprises: adjusting mode two: inputting the hot air temperature set value and the fresh air temperature set value, measuring the hot air temperature and the fresh air temperature in the pipeline by the platinum resistance installed on the corresponding air duct, then transmitting the corresponding temperature signal to the corresponding temperature transmitter in the electric control cabinet, comparing the temperature information with the corresponding temperature set value by the corresponding temperature transmitter, then transmitting the electric signal to the electrical converter, converting the electrical converter into a gas signal, then controlling the opening degree of the pneumatic diaphragm regulating valve on the corresponding steam pipeline to adjust the steam quantity into the corresponding heat exchanger, so as to control the hot air temperature and the fresh air temperature, and finally forming two independent regulation logic closed loops, the fresh air is only used as a supplementary mixed circulating air for high-temperature drying, so as to improve the initial temperature of the hot air, thereby reducing the regulation process of the hot air temperature heat exchanger and improving the stability of the hot air temperature.

5. A control method for a conditioning system for loose conditioning machine hot air temperature stabilization as defined in claim 1, wherein, For the high-grade tobacco sheet with stable formula, little difference in grade moisture and less content of tobacco green and impurity gas, the loose conditioning process is carried out, and adjusting mode one is switched to regulate the hot air temperature; for the tobacco sheet with large difference in formula grade, uneven water holding capacity and specific heat capacity, more aged tobacco leaves and high content of tobacco green and impurity gas, the loose conditioning process is carried out, and adjusting mode two is switched to regulate the hot air temperature; in order to improve the intelligence and automation of the loose conditioning machine and reduce manual intervention, adjusting mode three is switched to regulate the hot air temperature.

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