Drying regulation and control system for traditional Chinese medicinal materials

Abstract

The invention discloses a traditional Chinese medicinal material drying regulation and control system which comprises a volatile oil real-time monitoring module, a temperature and humidity regulation and control module and a numerical control module, the volatile oil real-time monitoring module detects angelica sinensis samples taken from a drying oven at intervals, and the actual content of angelica sinensis moisture and angelica sinensis volatile oil components is obtained; the volatile oil real-time monitoring module monitors the composition proportion of the angelica sinensis volatile oil in the mixed gas of the water vapor and the volatile oil in real time and calculates the evaporation capacity of the angelica sinensis volatile oil. According to the traditional Chinese medicinal material drying regulation and control system disclosed by the invention, the evaporation capacity and the evaporation rate of angelica volatile oil and the actual content and the loss rate of the angelica volatile oil are detected by adopting a gaseous detection mode and a solid detection mode, and the humidity of the drying oven is regulated and controlled based on the evaporation capacity and the evaporation rate of the angelica volatile oil and the actual content and the loss rate of the angelica volatile oil; chinese angelica drying time is shortened, Chinese angelica drying efficiency is improved, and Chinese angelica volatile oil component content is reserved.

Description

Technical Field

[0001] The invention relates to the technical field of drying Chinese medicinal materials, and in particular to a drying control system for Chinese medicinal materials. Background Art

[0002] Angelica sinensis is a perennial herbaceous plant of the Umbelliferae family. Its taproot is enlarged and cylindrical, with a yellow-brown to brownish-brown surface, longitudinal wrinkles and transverse lenticels, and a yellow-white cross section with dense brownish-yellow oil spots. It is divided into the head (blunt and thick), the body (the middle of the taproot) and the tail (slender branch roots) according to different medicinal parts. Its core active ingredient, volatile oil (including ligustilide, n-butylene furolactone, α-pinene, etc.) is the key to the pharmacological effects of Angelica sinensis, which has multiple effects such as promoting hematopoiesis, anti-thrombosis, regulating immunity, anti-oxidation, anti-inflammatory and analgesic. The existing open literature technology "The Effect of Different Drying Methods on the Volatile Oil Composition of Angelica Sinensis, Tang Wenwen" states: The volatile oil content of Angelica Sinensis dried in the shade and dried at 40℃ is the highest, which are 1.165% and 1.074% respectively. The best drying method for Angelica Sinensis is to use a constant temperature drying at 40℃; The invention patent application with publication number CN112618364A discloses a method and production line for preparing and drying Chinese medicinal materials. The patent adopts a three-step process of low temperature-high temperature-low temperature to dry the Chinese medicinal materials, so that the water in the Chinese medicinal materials evaporates in a relatively long and reasonable period of time, ensuring that the medicinal components in the medicinal materials are not lost during the evaporation of water, thereby improving the appearance and production efficiency of the finished medicinal materials. However, due to the heat-sensitive characteristics of the components in the volatile oil of Angelica sinensis, high temperature can easily cause the heat-sensitive components in the volatile oil of Angelica sinensis to volatilize and deteriorate. Using this method to dry Angelica sinensis cannot retain the volatile oil components of Angelica sinensis while improving the drying efficiency of Angelica sinensis, thereby reducing the efficacy of Angelica sinensis.

[0003] Therefore, there is an urgent need for a drying control system for Chinese medicinal materials that can improve the drying efficiency of Angelica sinensis and retain the volatile oil components of Angelica sinensis, so as to solve the problems raised in the above background technology. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a drying control system for Chinese medicinal materials, which adopts gaseous and solid detection methods to detect the evaporation amount and evaporation rate of angelica volatile oil, the actual content and loss rate of angelica volatile oil, and dually controls the humidity of the oven based on the evaporation amount and evaporation rate of angelica volatile oil, the actual content and loss rate of angelica volatile oil, shortens the drying time of angelica, improves the drying efficiency of angelica, and retains the content of angelica volatile oil components, so as to solve the problems raised in the above-mentioned background technology: A drying control system for Chinese medicinal materials comprises: a volatile oil real-time monitoring module, a temperature and humidity control module and a numerical control module, wherein the volatile oil real-time monitoring module detects angelica samples taken from an oven at intervals to obtain the actual content of angelica water and angelica volatile oil components; the volatile oil real-time monitoring module monitors the composition ratio of angelica volatile oil in a mixed gas of water vapor and volatile oil in real time, and calculates the evaporation amount of angelica volatile oil; the volatile oil real-time monitoring module calculates the loss amount and loss rate of angelica volatile oil based on the actual content of angelica volatile oil components and the evaporation amount of angelica volatile oil; the temperature and humidity control module monitors the temperature and humidity in the oven in real time to maintain the oven temperature at a constant temperature of 40°; the temperature and humidity control module dynamically adjusts the oven humidity based on the loss amount and loss rate of angelica volatile oil, improves the drying efficiency of angelica, and retains the angelica volatile oil components; the numerical control module records system operation data in real time, and feeds the system operation data back to the system terminal for staff to view.

[0005] As a further solution of the present invention: the volatile oil real-time monitoring module includes a gaseous detection unit and a solid-state detection unit, wherein the gaseous detection unit is used to detect the mixed gas of water vapor and volatile oil, and analyze the composition ratio of water vapor and angelica volatile oil in the mixed gas; the gaseous detection unit calculates the evaporation amount of water vapor and angelica volatile oil based on the evaporation rate of the mixed gas of water vapor and volatile oil; the solid-state detection unit is used to intermittently detect the angelica samples taken from the oven to obtain the actual content of angelica water and angelica volatile oil components; the solid-state detection unit calculates the drying efficiency of angelica water according to the actual content of angelica water; the solid-state detection unit calculates the loss amount and loss rate of angelica volatile oil based on the actual content of angelica volatile oil components.

[0006] As a further solution of the present invention: the temperature and humidity control module includes a sensor unit, a temperature control unit, a humidity control unit and a humidity threshold protection unit, wherein the sensor unit is used to monitor the temperature and humidity of the oven in real time; the temperature control unit adopts a PID controller to maintain the oven temperature at a constant temperature of 40°C; the humidity control unit dynamically adjusts the oven humidity based on the loss amount of angelica volatile oil to improve the drying efficiency; the humidity threshold protection unit compensates the oven humidity based on the loss rate of angelica volatile oil to prevent excessive loss of angelica volatile oil, and the loss rate threshold of angelica volatile oil is ≥0.05% / h.

[0007] As a further solution of the present invention: the method for dynamically adjusting the humidity of the oven by the humidity control unit is as follows: Step 1: Initial high humidity stage: The oven humidity is 50%-60%, using the thermal enthalpy of high humidity air to improve the water evaporation efficiency, prevent the angelica skin from hardening too quickly, and promote the migration of internal moisture to the outside; Step 2, mid-term gradient dehumidification stage: adjust the oven humidity to 30%-40% to accelerate the evaporation of surface water. The sensor unit monitors the humidity in the oven in real time to prevent the humidity from being less than 30%, which causes the volatile oil to escape quickly with the steam. Step 3, final low-humidity shaping stage: Take samples to test the actual content of Angelica sinensis moisture and Angelica sinensis volatile oil components. When the Angelica sinensis moisture content drops below 20%, adjust the oven humidity to 20%-25% to quickly remove residual moisture and shorten the drying cycle. When the Angelica sinensis volatile oil loss rate is ≥0.05% / h, adjust the oven humidity to increase by 3% to prevent excessive loss of Angelica sinensis volatile oil.

[0008] As a further solution of the present invention: the gas detection unit includes a QCM sensor and a conductive polymer sensor. The QCM sensor and the conductive polymer sensor array are in a gas collecting hood located above the oven, and are used to monitor in real time the composition ratio of water vapor and angelica volatile oil in the mixed gas of water vapor and volatile oil in the oven, and feed back the composition ratio data of water vapor and angelica volatile oil to the CNC module for storage.

[0009] As a further solution of the present invention: the solid-state detection unit uses an integrated miniaturized chromatographic column and a mass spectrometer to detect the actual content of water and volatile oil components of the angelica sample taken out from the oven, and the interval sampling and detection time of the angelica sample in the oven is 0.5h.

[0010] As a further solution of the present invention: the sensor unit includes a plurality of temperature and humidity sensors, and the plurality of temperature and humidity sensors are evenly distributed inside the oven for real-time monitoring of the temperature and humidity of the oven.

[0011] As a further solution of the present invention: the method for calculating the loss amount and loss rate of angelica volatile oil by the solid detection unit is as follows: Step 1, randomly selecting fresh angelica as a sample, and detecting the initial content of volatile oil in the fresh angelica sample; Step 2: After drying for 0.5 h, randomly select the angelica in the oven as a sample, detect the actual content of the volatile oil in the angelica sample, obtain the actual content of the volatile oil in the angelica after drying for 0.5 h, calculate the difference between the initial content of the volatile oil in the angelica and the actual content of the volatile oil in the angelica after drying for 0.5 h, and obtain the loss of the volatile oil in the angelica during drying for 0-0.5 h; Step 3, using the interval time of 0.5 h for selecting and testing the angelica samples as the denominator, and using the loss of angelica volatile oil during drying for 0-0.5 h as the numerator to calculate the loss rate of angelica volatile oil during drying for 0-0.5 h; Step 4: After drying for 1 hour, randomly select the angelica in the oven as a sample, detect the actual content of the volatile oil of the angelica sample, obtain the actual content of the volatile oil of the angelica after drying for 1 hour, calculate the difference between the actual content of the volatile oil of the angelica after drying for 0.5 hour and the actual content of the volatile oil of the angelica after drying for 1 hour, and obtain the loss of the volatile oil of the angelica when drying for 0.5-1 hour; Step 5, using the interval time of 0.5 h for selecting and testing the angelica samples as the denominator, and using the loss of angelica volatile oil during drying for 0.5-1 h as the numerator to calculate the loss rate of angelica volatile oil during drying for 0.5-1 h; Step 6: Repeat the above steps to calculate the loss rate of angelica volatile oil in each time period.

[0012] As a further solution of the present invention: the numerical control module includes a data storage unit, a control unit and an audio-visual warning unit, wherein the data storage unit is used to store the drying data of angelica and the operation data of each device in real time; the control unit is used to control the opening and closing of the dehumidification fan and the humidifier to adjust the humidity of the oven, improve the drying efficiency, and retain the volatile oil components; the audio-visual warning unit warns the staff according to the loss rate of angelica volatile oil. When the loss rate of angelica volatile oil is ≥0.05% / h, the audio-visual warning unit will work to emit a buzzer alarm and a visual warning.

[0013] Compared with the prior art, the advantages of the present invention are as follows: the drying control system of traditional Chinese medicine proposed by the present invention adopts a sensor unit to monitor the temperature and humidity of the oven in real time, maintains the oven temperature at a constant temperature of 40°, the gas detection unit detects the composition ratio and evaporation rate of the angelica volatile oil in the mixed gas of water vapor and volatile oil, calculates the evaporation amount of the angelica volatile oil, the humidity control unit dynamically controls the oven humidity based on the evaporation amount and evaporation rate of the angelica volatile oil, accelerates the evaporation of water on the surface of the angelica, and at the same time, the solid-state detection unit detects the actual content of the angelica volatile oil component of the angelica sample taken from the oven at intervals, calculates the loss amount and loss rate of the angelica volatile oil, and the humidity control unit secondary controls the oven humidity based on the loss amount and loss rate of the angelica volatile oil, thereby achieving the purpose of oven humidity control calibration and correction, accurately controlling the oven humidity, improving the angelica drying efficiency, and retaining the angelica volatile oil component content. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a drying control system for Chinese medicinal materials of the present invention; Figure 2 A schematic diagram of the process for dynamically adjusting the humidity in the oven; Figure 3 Schematic diagram of detection of mixed gas of water vapor and volatile oil. DETAILED DESCRIPTION

[0015] Combination Figure 1-Figure 2As shown, in this embodiment, a drying control system for Chinese medicinal materials includes: a real-time monitoring module for volatile oil, a temperature and humidity control module, and a numerical control module; the system monitors the temperature and humidity of the oven in real time based on the sensor unit, the temperature control unit maintains the oven temperature at a constant temperature of 40°, the gas detection unit detects the composition ratio and evaporation rate of the angelica volatile oil in the mixed gas of water vapor and volatile oil, calculates the evaporation amount of the angelica volatile oil, and the humidity control unit dynamically controls the oven humidity based on the evaporation amount and evaporation rate of the angelica volatile oil to accelerate the evaporation of water on the surface of the angelica. The solid-state detection unit detects the actual content of the moisture and angelica volatile oil components of the angelica sample taken from the oven at intervals, calculates the loss amount and loss rate of the angelica volatile oil, and the humidity control unit secondary controls the oven humidity based on the loss amount and loss rate of the angelica volatile oil, so as to achieve the purpose of oven humidity control calibration and correction, accurately control the oven humidity, and improve the drying efficiency of the angelica. The humidity threshold protection unit monitors the loss rate of Angelica sinensis volatile oil ≥ 0.05% / h, and feeds back the signal of Angelica sinensis volatile oil loss rate ≥ 0.05% / h to the system. The sound and light warning unit emits a buzzer alarm and a visual warning to alert the passengers sitting next to each other. At the same time, the control unit controls the opening and closing of the dehumidification fan and humidifier to adjust the humidity of the oven to prevent excessive loss of Angelica sinensis volatile oil and retain the content of Angelica sinensis volatile oil components.

[0016] In this embodiment, combined with Figure 3 As shown, Figure 3 The diagram is a detection diagram of a mixed gas of water vapor and volatile oil; the angelica drying equipment includes an open oven, a steam pipe and a gas collecting hood, and the process flow of the equipment is: turn on the power of each device, use a temperature and humidity sensor to monitor the temperature and humidity in the open oven, preheat the open oven to a constant temperature of 40°, make the temperature in the hopper of the open oven uniform, evenly spread the pretreated angelica in the hopper of the open oven, turn on the exhaust system, extract the mixed gas of water vapor and volatile oil generated by the angelica drying at a constant temperature of 40° into the air collecting hood, let the mixed gas of water vapor and volatile oil flow through the air collecting hood into the steam pipe for discharge, so as to achieve angelica drying and water vapor treatment, and at the same time, the QCM sensor and the conductive polymer sensor array arranged in the gas collecting hood monitor the composition ratio and evaporation rate of water vapor and angelica volatile oil in the mixed gas of water vapor and volatile oil in the oven in real time, feed back the composition ratio and evaporation rate data of water vapor and angelica volatile oil to the system for storage, and the system dynamically adjusts the humidity of the oven according to the evaporation rate of angelica volatile oil.

[0017] Based on Example 1, an angelica sample was selected, and the moisture content and angelica volatile oil content of the angelica sample were determined. The moisture content of the angelica sample was 75%, and the angelica volatile oil content was 1.05%. The oven temperature was set to a constant temperature of 40°. The method for dynamically controlling the oven humidity of the system is specifically the following steps: Step 1, initial high humidity stage: The oven humidity is 55%±2%, and the thermal enthalpy of high humidity air is used to improve the water evaporation efficiency, prevent the angelica skin from hardening too quickly, and promote the migration of internal water outward. During this stage, the water content of angelica is reduced from 75% to 58%, and the loss rate of volatile oil is controlled at 0.1%, which is lower than the traditional process of 0.3%; Step 2, mid-term gradient dehumidification stage: The humidity in the oven is regulated to decrease to 35%±3% at a rate of 1.2% / h to accelerate the evaporation of surface water. The sensor unit monitors the humidity in the oven in real time to prevent the humidity from being less than 30%, which causes the volatile oil to escape quickly with the steam. The moisture content of angelica sinensis decreases from 58% to 20%. The moisture removal efficiency in this stage reaches 1.45g / (h·kg), which is 48% higher than that of the traditional process. Step 3, final low-humidity setting stage: sampling to detect the actual content of Angelica sinensis moisture and Angelica sinensis volatile oil components. When the Angelica sinensis moisture content drops below 20%, the oven humidity is adjusted to 25% ± 2% to quickly remove residual moisture and shorten the drying cycle. The loss rate of Angelica sinensis volatile oil is ≥ 0.05% / h, and the oven humidity is adjusted to increase by 3% to prevent excessive loss of Angelica sinensis volatile oil. When the Angelica sinensis moisture content drops to 11.5%, the drying is terminated.

[0018] The following table shows the comparative data of the traditional process and the drying process of this application when the angelica is dried at a constant temperature of 40°: index Traditional crafts This application process Total drying time (h) 61 49 Total loss rate of volatile oil 7.8% 2.1% Epidermal rupture rate 9% 1.2% Mildew incidence 3.7% 0 It can be seen that when the angelica is dried at a constant temperature of 40°, the present application shortens the drying time of the traditional process from 61h to 49h and increases the drying efficiency to 24.6% by staged humidity control while preventing mildew (humidity ≥ 20%), thus achieving the best balance between drying efficiency and ingredient retention. Based on Example 1, an angelica sample was selected, and the initial content of volatile oil in the angelica sample was determined to obtain an initial content of 1.05% of angelica volatile oil. The oven temperature was set to a constant temperature of 40°. The method for calculating the loss amount and loss rate of angelica volatile oil in this system is specifically the following steps: Step 1: After drying for 0.5 h, randomly select the angelica in the oven as a sample, detect the actual content of volatile oil in the angelica sample to be 1.0285%, calculate the difference between the initial content of angelica volatile oil of 1.05% and the actual content of angelica volatile oil of 1.0285% after drying for 0.5 h, and obtain the loss of angelica volatile oil during drying for 0-0.5 h, which is 0.0215%; Step 2, using the interval time of selecting and testing the angelica samples (0.5 h) as the denominator, and using the loss of angelica volatile oil (0.0215%) during drying (0-0.5 h) as the numerator to calculate the loss rate of angelica volatile oil during drying (0-0.5 h), and obtaining a loss rate of angelica volatile oil (0.043% h) during drying (0-0.5 h); Step 3: After drying for 1 hour, randomly select the angelica in the oven as a sample, detect the actual content of volatile oil in the angelica sample to be 1.0045%, calculate the difference between the actual content of volatile oil of angelica after drying for 0.5 hour (1.0285%) and the actual content of volatile oil of angelica after drying for 1 hour (1.0045%), and obtain the loss of volatile oil of angelica during drying for 0.5-1 hour (0.024%); Step 4, using the interval time of selecting and testing the angelica sample of 0.5h as the denominator, and using the loss of angelica volatile oil of 0.024% when drying for 0.5-1h as the numerator to calculate the loss rate of angelica volatile oil when drying for 0.5-1h, and obtaining the loss rate of angelica volatile oil when drying for 0.5-1h of 0.048%h; Step 5: After drying for 1.5 hours, randomly select the angelica in the oven as a sample, detect the actual content of volatile oil in the angelica sample to be 0.9745%, calculate the difference between the actual content of volatile oil of angelica after drying for 1 hour (1.0045%) and the actual content of volatile oil of angelica after drying for 1.5 hours (0.9745%), and obtain the loss of volatile oil of angelica during drying for 1-1.5 hours (0.03%); Step 6, using the interval time of selecting and testing the angelica sample of 0.5h as the denominator, and using the loss of angelica volatile oil of 0.03% when drying for 1-1.5h as the numerator to calculate the loss rate of angelica volatile oil when drying for 1-1.5h, and obtaining the loss rate of angelica volatile oil when drying for 1-1.5h of 0.06%h; The loss rate of volatile oil of Angelica sinensis was ≥0.05% / h, the humidity of the oven increased by 3%, and the Angelica sinensis was continuously dried; Step 7: Repeat the above steps, select angelica samples at intervals of 0.5 h, detect the actual content of volatile oil in the angelica samples, and calculate the loss amount and loss rate of angelica volatile oil in each time period until the drying is completed.

[0019] The above method is used to calculate the loss amount and loss rate of Angelica sinensis volatile oil, and the oven humidity is secondary controlled according to the loss amount and loss rate of Angelica sinensis volatile oil, so as to achieve the purpose of oven humidity control calibration and correction, and prevent excessive loss of Angelica sinensis volatile oil.

[0020] The drying control system of traditional Chinese medicine proposed by the present invention monitors the temperature and humidity of the oven in real time based on the sensor unit, maintains the oven temperature at a constant temperature of 40°, detects the composition ratio and evaporation rate of the angelica volatile oil in the mixed gas of water vapor and volatile oil through the gas detection unit, calculates the evaporation amount of the angelica volatile oil, and the humidity control unit dynamically controls the oven humidity based on the evaporation amount and evaporation rate of the angelica volatile oil in the mixed gas of water vapor and volatile oil, accelerates the evaporation of water on the surface of the angelica, and at the same time, the solid detection unit detects the actual content of the water content and angelica volatile oil components of the angelica sample taken from the oven at intervals, calculates the loss amount and loss rate of the angelica volatile oil, and the humidity control unit secondary controls the oven humidity based on the loss amount and loss rate of the angelica volatile oil, so as to achieve the purpose of oven humidity control verification and correction, prevent excessive loss of angelica volatile oil, accurately control the oven humidity, improve the angelica drying efficiency, and retain the angelica volatile oil component content.

[0021] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A drying control system for Chinese medicinal materials, characterized in that: include: A volatile oil real-time monitoring module, a temperature and humidity control module and a numerical control module, wherein the volatile oil real-time monitoring module detects the angelica sample taken from the oven at intervals to obtain the actual content of the angelica moisture and angelica volatile oil components; the volatile oil real-time monitoring module monitors the composition ratio of the angelica volatile oil in the mixed gas of water vapor and volatile oil in real time, and calculates the evaporation amount of the angelica volatile oil; the volatile oil real-time monitoring module calculates the loss amount and loss rate of the angelica volatile oil based on the actual content of the angelica volatile oil components and the evaporation amount of the angelica volatile oil; the temperature and humidity control module monitors the temperature and humidity in the oven in real time to maintain the oven temperature at a constant temperature of 40°; the temperature and humidity control module dynamically adjusts the oven humidity based on the loss amount and loss rate of the angelica volatile oil, improves the drying efficiency of the angelica, and retains the angelica volatile oil components; the numerical control module records the system operation data in real time, and feeds the system operation data back to the system terminal for staff to view.

2. A drying control system for Chinese medicinal materials according to claim 1, characterized in that: The volatile oil real-time monitoring module includes a gas detection unit and a solid detection unit, wherein the gas detection unit is used to detect the mixed gas of water vapor and volatile oil, and analyze the composition ratio of water vapor and angelica volatile oil in the mixed gas; the gas detection unit calculates the evaporation amount of water vapor and angelica volatile oil based on the evaporation rate of the mixed gas of water vapor and volatile oil; the solid detection unit is used to intermittently detect the angelica samples taken from the oven to obtain the actual content of angelica water and angelica volatile oil components; the solid detection unit calculates the drying efficiency of angelica water according to the actual content of angelica water; the solid detection unit calculates the loss amount and loss rate of angelica volatile oil based on the actual content of angelica volatile oil components.

3. A drying control system for Chinese medicinal materials according to claim 1, characterized in that: The temperature and humidity control module includes a sensor unit, a temperature control unit, a humidity control unit and a humidity threshold protection unit, wherein the sensor unit is used to monitor the temperature and humidity of the oven in real time; the temperature control unit adopts a PID controller to maintain the oven temperature at a constant temperature of 40°C; the humidity control unit dynamically adjusts the oven humidity based on the loss amount of angelica volatile oil to improve the drying efficiency; the humidity threshold protection unit compensates the oven humidity based on the loss rate of angelica volatile oil to prevent excessive loss of angelica volatile oil, and the loss rate threshold of angelica volatile oil is ≥0.05% / h.

4. A drying control system for Chinese medicinal materials according to claim 3, characterized in that: The method for dynamically adjusting the humidity of the oven by the humidity control unit comprises the following steps: Step 1: Initial high humidity stage: The oven humidity is 50%-60%, using the thermal enthalpy of high humidity air to improve the water evaporation efficiency, prevent the angelica skin from hardening too quickly, and promote the migration of internal moisture to the outside; Step 2, mid-term gradient dehumidification stage: adjust the humidity of the oven to 30%-40% to accelerate the evaporation of surface water. The sensor unit monitors the humidity in the oven in real time to prevent the humidity from being less than 30%, which causes the volatile oil to escape quickly with the steam. Step 3, final low-humidity shaping stage: Take samples to test the actual content of Angelica sinensis moisture and Angelica sinensis volatile oil components. When the Angelica sinensis moisture content drops below 20%, adjust the oven humidity to 20%-25% to quickly remove residual moisture and shorten the drying cycle. When the Angelica sinensis volatile oil loss rate is ≥0.05% / h, adjust the oven humidity to increase by 3% to prevent excessive loss of Angelica sinensis volatile oil.

5. A drying control system for Chinese medicinal materials according to claim 2, characterized in that: The gas detection unit includes a QCM sensor and a conductive polymer sensor. The QCM sensor and the conductive polymer sensor array are in a gas collecting hood located above the oven, and are used to monitor in real time the composition ratio of water vapor and angelica volatile oil in the mixed gas of water vapor and volatile oil in the oven, and feed back the composition ratio data of water vapor and angelica volatile oil to the numerical control module for storage.

6. A drying control system for Chinese medicinal materials according to claim 2, characterized in that: The solid-state detection unit uses an integrated miniaturized chromatographic column and a mass spectrometer to detect the actual content of water and volatile oil components of the angelica sample taken out from the oven. The interval sampling and detection time of the angelica sample in the oven is 0.5h.

7. A drying control system for Chinese medicinal materials according to claim 3, characterized in that: The sensor unit includes a plurality of temperature and humidity sensors, which are evenly distributed inside the oven for real-time monitoring of the temperature and humidity of the oven.

8. A drying control system for Chinese medicinal materials according to claim 2, characterized in that: The method for calculating the loss amount and loss rate of angelica volatile oil by the solid-state detection unit is as follows: Step 1, randomly selecting fresh angelica as a sample, and detecting the initial content of volatile oil in the fresh angelica sample; Step 2: After drying for 0.5 h, randomly select the angelica in the oven as a sample, detect the actual content of the volatile oil in the angelica sample, obtain the actual content of the volatile oil in the angelica after drying for 0.5 h, calculate the difference between the initial content of the volatile oil in the angelica and the actual content of the volatile oil in the angelica after drying for 0.5 h, and obtain the loss of the volatile oil in the angelica during drying for 0-0.5 h; Step 3, using the interval time of 0.5 h for selecting and testing the angelica samples as the denominator, and using the loss of angelica volatile oil during drying for 0-0.5 h as the numerator to calculate the loss rate of angelica volatile oil during drying for 0-0.5 h; Step 4: After drying for 1 hour, randomly select the angelica in the oven as a sample, detect the actual content of the volatile oil of the angelica sample, obtain the actual content of the volatile oil of the angelica after drying for 1 hour, calculate the difference between the actual content of the volatile oil of the angelica after drying for 0.5 hour and the actual content of the volatile oil of the angelica after drying for 1 hour, and obtain the loss of the volatile oil of the angelica when drying for 0.5-1 hour; Step 5, using the interval time of 0.5 h for selecting and testing the angelica samples as the denominator, and using the loss of angelica volatile oil during drying for 0.5-1 h as the numerator to calculate the loss rate of angelica volatile oil during drying for 0.5-1 h; Step 6: Repeat the above steps to calculate the loss rate of angelica volatile oil in each time period.

9. A drying control system for Chinese medicinal materials according to claim 1, characterized in that: The numerical control module includes a data storage unit, a control unit and an audio-visual warning unit, wherein the data storage unit is used to store the drying data of angelica and the operation data of each device in real time; the control unit is used to control the opening and closing of the dehumidification fan and the humidifier to adjust the humidity of the oven, improve the drying efficiency, and retain the volatile oil components; the audio-visual warning unit warns the staff according to the loss rate of angelica volatile oil. When the loss rate of angelica volatile oil is ≥0.05% / h, the audio-visual warning unit will work to emit a buzzer alarm and a visual warning.

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