A drying control system for traditional Chinese medicinal materials

Abstract

The present application discloses a drying control system for Chinese medicinal materials, which includes: a volatile oil real-time monitoring module, a temperature and humidity control module, and a numerical control module. Among them, the volatile oil real-time monitoring module intermittently detects the Angelica sinensis samples taken from the oven to obtain the actual contents of the moisture in Angelica sinensis and the components of the volatile oil in Angelica sinensis; the volatile oil real-time monitoring module monitors in real time the composition ratio of the volatile oil in Angelica sinensis in the mixed gas of water vapor and volatile oil, and calculates the evaporation amount of the volatile oil in Angelica sinensis. The drying control system for Chinese medicinal materials disclosed in the present application uses two detection methods, namely gaseous and solid state, to detect the evaporation amount and evaporation rate of the volatile oil in Angelica sinensis, the actual content and loss rate of the volatile oil in Angelica sinensis, and double-controls the humidity of the oven based on the evaporation amount and evaporation rate of the volatile oil in Angelica sinensis, the actual content and loss rate of the volatile oil in Angelica sinensis, shortens the drying time of Angelica sinensis, improves the drying efficiency of Angelica sinensis, and retains the content of the volatile oil components in Angelica sinensis.

Description

Technical Field

[0001] The present invention relates to the technical field of Chinese herbal medicine drying, and particularly relates to a drying control system for Chinese herbal medicine. Background Art

[0002] Angelica sinensis is a perennial herb of the Umbelliferae family. Its main root is thick and cylindrical, with a surface color ranging from yellowish-brown to brownish-black, having longitudinal wrinkles and transverse lenticels. The cross-section is yellowish-white and densely covered with yellowish-brown oil dots. Depending on the medicinal part, it is divided into the head of Angelica (round, thick and large), the body of Angelica (the middle part of the main root), and the tail of Angelica (slender branch roots). Its core active ingredient, volatile oil (containing ligustilide, butylidene phthalide, α-pinene, etc.), is the key to the pharmacological effects of Angelica sinensis, and has multiple effects such as promoting hematopoiesis, anti-thrombosis, regulating immunity, antioxidant, anti-inflammatory and analgesic effects;

[0003] The existing publicly available literature technology "The Influence of Different Drying Methods on the Volatile Oil Components of Angelica sinensis, Tang Wenwen" shows that the volatile oil content in Angelica sinensis dried in the shade and at 40°C is the highest, 1.165% and 1.074% respectively. The drying method of Angelica sinensis should preferably be constant-temperature drying at 40°C;

[0004] The patent application of the invention with the publication number CN112618364A discloses a method and production line for processing and drying Chinese herbal medicine. This patent uses a three-step drying method of low temperature - high temperature - low temperature to dry Chinese herbal medicine, allowing the moisture in the Chinese herbal medicine to evaporate during a relatively long reasonable period, ensuring that the medicinal components in the Chinese herbal medicine do not lose during the moisture evaporation process, thereby improving the appearance and production efficiency of the finished medicinal materials. However, due to the thermosensitive characteristics of the components in the volatile oil of Angelica sinensis, high temperature easily causes the thermosensitive components in the volatile oil of Angelica sinensis to volatilize and deteriorate. Using this method to dry Angelica sinensis cannot improve the drying efficiency of Angelica sinensis while retaining the volatile oil components of Angelica sinensis, resulting in a reduction in the medicinal effect of Angelica sinensis.

[0005] Therefore, there is an urgent need for a drying control system for Chinese herbal medicine that can improve the drying efficiency of Angelica sinensis and retain the volatile oil components of Angelica sinensis to solve the problems raised in the above background art. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a drying control system for Chinese herbal medicine, which uses two detection methods, gaseous and solid state, to detect the evaporation amount and evaporation rate of the volatile oil of Angelica sinensis, the actual content and loss rate of the volatile oil of Angelica sinensis, and double-regulates the humidity of the oven based on the evaporation amount and evaporation rate of the volatile oil of Angelica sinensis, the actual content and loss rate of the volatile oil of Angelica sinensis, shortens the drying time of Angelica sinensis, improves the drying efficiency of Angelica sinensis, and retains the content of the volatile oil components of Angelica sinensis to solve the problems raised in the above background art:

[0007] A drying control system for traditional Chinese medicine materials, comprising: a volatile oil real-time monitoring module, a temperature and humidity control module, and a numerical control module. Among them, the volatile oil real-time monitoring module intermittently detects the angelica samples taken from the oven to obtain the actual content of angelica moisture and angelica volatile oil components; the volatile oil real-time monitoring module real-time monitors the composition ratio of angelica volatile oil in the mixed gas of water vapor and volatile oil, 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 real-time monitors the temperature and humidity in the oven, and maintains the oven temperature at a constant 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 real-time records the system operation data and feeds the system operation data back to the system terminal for the staff to view.

[0008] As a further scheme of the present invention: the volatile oil real-time monitoring module includes a gaseous detection unit and a solid detection unit. Among them, 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 amounts 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 moisture and angelica volatile oil components; the solid detection unit calculates the drying efficiency of angelica moisture according to the actual content of angelica moisture; 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.

[0009] As a further scheme 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. Among them, the sensor unit is used to real-time monitor the oven temperature and humidity; the temperature control unit uses a PID controller to maintain the oven temperature at a constant 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 the angelica volatile oil is ≥0.05% / h.

[0010] As a further scheme of the present invention: the method for the humidity control unit to dynamically adjust the oven humidity is as follows:

[0011] Step 1: Initial high-humidity stage: The oven humidity is 50%-60%. Utilize the enthalpy value of high-humidity air to improve the water evaporation efficiency, prevent the angelica epidermis from hardening too quickly, and promote the outward migration of internal moisture;

[0012] Step 2, Medium-term gradient humidity reduction stage: Regulate the humidity of the oven to be reduced to 30%-40% to accelerate the evaporation of surface moisture. The sensor unit monitors the humidity in the oven in real time to avoid the rapid escape of volatile oil with steam due to the humidity <30%.

[0013] Step 3, Final low-humidity shaping stage: Sample and detect the actual content of the moisture and volatile oil components of Angelica sinensis. When the moisture content of Angelica sinensis drops below 20%, regulate the humidity of the oven to be reduced to 20%-25% to quickly remove the residual moisture and shorten the drying cycle. When the loss rate of the volatile oil of Angelica sinensis ≥ 0.05% / h, regulate the humidity of the oven to increase by 3% to prevent excessive loss of the volatile oil of Angelica sinensis.

[0014] As a further scheme of the present invention: The gaseous detection unit includes a QCM sensor and a conductive polymer sensor. The QCM sensor and the conductive polymer sensor array are in the gas collection hood above the oven, and are used to monitor the composition ratio of water vapor and volatile oil in the mixed gas of water vapor and volatile oil in the oven in real time, and feedback the composition ratio data of water vapor and volatile oil of Angelica sinensis to the numerical control module for storage.

[0015] As a further scheme of the present invention: The solid-state detection unit uses an integrated miniaturized chromatographic column and a mass spectrometer detector to detect the actual content of the moisture and volatile oil components of the Angelica sinensis sample taken out of the oven. The interval sampling and detection time of the Angelica sinensis sample in the oven is 0.5 h.

[0016] As a further scheme 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 monitoring the temperature and humidity of the oven in real time.

[0017] As a further scheme of the present invention: The method for the solid-state detection unit to calculate the loss amount and loss rate of the volatile oil of Angelica sinensis is as follows:

[0018] Step 1, Randomly select fresh Angelica sinensis as a sample and detect the initial content of the volatile oil in the fresh Angelica sinensis sample;

[0019] Step 2, After drying for 0.5 h, randomly select the Angelica sinensis in the oven as a sample, detect the actual content of the volatile oil of the Angelica sinensis sample, obtain the actual content of the volatile oil of the Angelica sinensis after drying for 0.5 h, and calculate the difference between the initial content of the volatile oil of the Angelica sinensis and the actual content of the volatile oil of the Angelica sinensis after drying for 0.5 h to obtain the loss amount of the volatile oil of the Angelica sinensis from 0 to 0.5 h of drying;

[0020] Step 3, Use the interval time of 0.5 h for selecting and detecting the Angelica sinensis sample as the denominator, and use the loss amount of the volatile oil of the Angelica sinensis from 0 to 0.5 h of drying as the numerator to calculate the loss rate of the volatile oil of the Angelica sinensis from 0 to 0.5 h of drying;

[0021] Step 4: After drying for 1 h, randomly select the Angelica sinensis in the oven as a sample, detect the actual content of the volatile oil in the Angelica sinensis sample, obtain the actual content of the volatile oil in the Angelica sinensis after drying for 1 h, calculate the difference between the actual content of the volatile oil in the Angelica sinensis after drying for 0.5 h and the actual content of the volatile oil in the Angelica sinensis after drying for 1 h, and obtain the loss amount of the volatile oil in the Angelica sinensis from 0.5 to 1 h of drying;

[0022] Step 5: Use the interval time of 0.5 h for selecting and detecting the Angelica sinensis sample as the denominator, and use the loss amount of the volatile oil in the Angelica sinensis from 0.5 to 1 h of drying as the numerator to calculate the loss rate of the volatile oil in the Angelica sinensis from 0.5 to 1 h of drying;

[0023] Step 6: Repeat the above steps to calculate the loss rate of the volatile oil in the Angelica sinensis in each time period.

[0024] As a further scheme of the present invention: The numerical control module includes a data storage unit, a control unit and an acoustic-optic warning unit. Among them, the data storage unit is used to store the drying data of the Angelica sinensis and the operation data of each device in real time; the control unit is used to control the opening and closing of the moisture exhaust fan and the humidifier to adjust the humidity of the oven, improve the drying efficiency and retain the volatile oil components; the acoustic-optic warning unit warns the staff according to the loss rate of the volatile oil in the Angelica sinensis. When the loss rate of the volatile oil in the Angelica sinensis ≥ 0.05% / h, the acoustic-optic warning unit works to issue a buzzer alarm and a visual warning.

[0025] Compared with the prior art, the advantages of the present invention are as follows: The drying control system for traditional Chinese medicine proposed by the present invention uses a sensor unit to monitor the temperature and humidity of the oven in real time, maintains the oven temperature at a constant 40°, a gaseous detection unit detects the composition ratio and evaporation rate of the volatile oil in the mixed gas of water vapor and volatile oil, calculates the evaporation amount of the volatile oil in the Angelica sinensis, and a humidity control unit dynamically adjusts the humidity of the oven based on the evaporation amount and evaporation rate of the volatile oil in the Angelica sinensis to accelerate the evaporation of the surface moisture of the Angelica sinensis. At the same time, a solid detection unit intermittently detects the actual content of the volatile oil components in the Angelica sinensis sample taken from the oven, calculates the loss amount and loss rate of the volatile oil in the Angelica sinensis, and the humidity control unit secondarily adjusts the humidity of the oven based on the loss amount and loss rate of the volatile oil in the Angelica sinensis to achieve the purpose of calibrating and correcting the humidity control of the oven, accurately control the humidity of the oven, improve the drying efficiency of the Angelica sinensis, and retain the content of the volatile oil components in the Angelica sinensis. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of a drying control system for a traditional Chinese medicine according to the present invention;

[0027] Figure 2 It is a schematic flow diagram for dynamically adjusting the humidity of the oven;

[0028] Figure 3Schematic diagram for detecting the mixed gas of water vapor and volatile oil. Specific implementation mode

[0029] Combined with Figure 1 - Figure 2 As shown in the figure, in this embodiment, a drying control system for traditional Chinese medicine includes: a volatile oil real-time monitoring module, a temperature and humidity control module, and a numerical control module; the system monitors the oven temperature and humidity in real time based on the sensor unit, the temperature control unit maintains the oven temperature at a constant 40°, the gaseous detection unit detects the composition ratio and evaporation rate of angelica volatile oil in the mixed gas of water vapor and volatile oil, calculates the evaporation amount of angelica volatile oil, and the humidity control unit dynamically adjusts the oven humidity based on the evaporation amount and evaporation rate of angelica volatile oil to accelerate the evaporation of surface moisture of angelica. The solid-state detection unit intermittently detects the moisture content and the actual content of angelica volatile oil components in the angelica samples taken from the oven, calculates the loss amount and loss rate of angelica volatile oil, and the humidity control unit secondarily adjusts the oven humidity based on the loss amount and loss rate of angelica volatile oil to achieve the purpose of calibrating and correcting the oven humidity control, accurately control the oven humidity, and improve the drying efficiency of angelica. The humidity threshold protection unit monitors that the loss rate of angelica volatile oil ≥ 0.05% / h, feeds back the signal of the loss rate of angelica volatile oil ≥ 0.05% / h to the system, and the sound and light warning unit issues a buzzer alarm and a visual warning to alert the same-seat personnel. At the same time, the control unit controls the opening and closing of the moisture exhaust fan and the humidifier to adjust the oven humidity, prevent excessive loss of angelica volatile oil, and retain the content of angelica volatile oil components.

[0030] In this embodiment, combined with Figure 3 As shown in the figure, Figure 3 It is a schematic diagram for detecting the mixed gas of water vapor and volatile oil; the angelica drying equipment includes an open oven, a steam pipe, and a gas collection hood. The technological process of this equipment is as follows: 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 40°, make the temperature in the hopper of the open oven uniform, evenly spread the pretreated angelica on the hopper of the open oven, turn on the exhaust system, extract the mixed gas of water vapor and volatile oil generated by drying angelica at a constant 40° into the air collection hood, and let the mixed gas of water vapor and volatile oil flow through the air collection hood and into the steam pipe for discharge, realizing the drying of angelica and the treatment of water vapor. At the same time, the QCM sensor and the conductive polymer sensor array arranged in the air collection 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, and feed back the data of the composition ratio and evaporation rate of water vapor and angelica volatile oil to the system for storage, and the system dynamically adjusts the oven humidity according to the evaporation rate of angelica volatile oil.

[0031] Based on Example 1, Angelica samples were selected, and the moisture content and the content of volatile oil components in the Angelica samples were measured. The moisture content of the Angelica samples was obtained as 75%, and the content of volatile oil components was 1.05%. The oven temperature was set to a constant 40°. The method for dynamically regulating the humidity of the oven in this system is specifically as follows:

[0032] Step 1, initial high-humidity stage: The humidity of the oven is 55% ± 2%. The enthalpy value of high-humidity air is used to improve the moisture evaporation efficiency, prevent the epidermis of Angelica from hardening too quickly, and promote the outward migration of internal moisture. At this stage, the moisture content of Angelica decreases from 75% to 58%, and the loss rate of volatile oil is controlled within 0.1%, which is lower than 0.3% of the traditional process;

[0033] Step 2, mid-term gradient dehumidification stage: The humidity of the oven is regulated at a rate of 1.2% / h to decrease to 35% ± 3% to accelerate the evaporation of surface moisture. The sensor unit monitors the humidity in the oven in real time to avoid the rapid escape of volatile oil with steam due to the humidity < 30%. The moisture content of Angelica decreases from 58% → 20%. The moisture removal efficiency at this stage reaches 1.45 g / (h·kg), which is 48% higher than the traditional process;

[0034] Step 3, final low-humidity shaping stage: Samples are taken to detect the actual content of moisture and volatile oil components in Angelica. When the moisture content of Angelica drops below 20%, the humidity of the oven is regulated to decrease to 25% ± 2% to quickly remove the residual moisture and shorten the drying cycle; the loss rate of volatile oil in Angelica ≥ 0.05% / h, and the humidity of the oven is regulated to increase by 3% to prevent excessive loss of volatile oil in Angelica. When the moisture content of Angelica drops to 11.5%, the drying is ended.

[0035] The following table shows the comparison data between the traditional process and the drying process of this application when drying Angelica at a constant temperature of 40°:

[0036] Index Traditional process Process of this application Total drying time (h) 61 49 Total loss rate of volatile oil 7.8% 2.1% Rate of epidermal rupture 9% 1.2% Incidence of mildew 3.7% 0

[0037] It can be seen from this that when drying Angelica at a constant temperature of 40°, through staged humidity regulation in this application, on the premise of preventing mildew (humidity ≥ 20%), the drying time of the traditional process, which is 61 h, is shortened to 49 h, and the drying efficiency is increased to 24.6%, achieving the best balance between drying efficiency and component retention;

[0038] Based on Example 1, Angelica samples were selected, and the initial content of volatile oil in the Angelica samples was measured. The initial content of volatile oil in Angelica was obtained as 1.05%. The oven temperature was set to a constant 40°. The method for calculating the loss amount and loss rate of volatile oil in Angelica in this system is specifically as follows:

[0039] Step 1: After drying for 0.5 h, randomly select the Angelica sinensis in the oven as a sample, and detect that the actual content of volatile oil in the Angelica sinensis sample is 1.0285%. Calculate the difference between the initial content of volatile oil in Angelica sinensis, 1.05%, and the actual content of volatile oil in Angelica sinensis after drying for 0.5 h, 1.0285%, to obtain the loss amount of volatile oil in Angelica sinensis from 0 to 0.5 h of drying, 0.0215%.

[0040] Step 2: Take the interval time of 0.5 h for selecting and detecting the Angelica sinensis sample as the denominator, and take the loss amount of volatile oil in Angelica sinensis from 0 to 0.5 h of drying, 0.0215%, as the numerator to calculate the loss rate of volatile oil in Angelica sinensis from 0 to 0.5 h of drying, and obtain the loss rate of volatile oil in Angelica sinensis from 0 to 0.5 h of drying, 0.043% / h.

[0041] Step 3: After drying for 1 h, randomly select the Angelica sinensis in the oven as a sample, and detect that the actual content of volatile oil in the Angelica sinensis sample is 1.0045%. Calculate the difference between the actual content of volatile oil in Angelica sinensis after drying for 0.5 h, 1.0285%, and the actual content of volatile oil in Angelica sinensis after drying for 1 h, 1.0045%, to obtain the loss amount of volatile oil in Angelica sinensis from 0.5 to 1 h of drying, 0.024%.

[0042] Step 4: Take the interval time of 0.5 h for selecting and detecting the Angelica sinensis sample as the denominator, and take the loss amount of volatile oil in Angelica sinensis from 0.5 to 1 h of drying, 0.024%, as the numerator to calculate the loss rate of volatile oil in Angelica sinensis from 0.5 to 1 h of drying, and obtain the loss rate of volatile oil in Angelica sinensis from 0.5 to 1 h of drying, 0.048% / h.

[0043] Step 5: After drying for 1.5 h, randomly select the Angelica sinensis in the oven as a sample, and detect that the actual content of volatile oil in the Angelica sinensis sample is 0.9745%. Calculate the difference between the actual content of volatile oil in Angelica sinensis after drying for 1 h, 1.0045%, and the actual content of volatile oil in Angelica sinensis after drying for 1.5 h, 0.9745%, to obtain the loss amount of volatile oil in Angelica sinensis from 1 to 1.5 h of drying, 0.03%.

[0044] Step 6: Take the interval time of 0.5 h for selecting and detecting the Angelica sinensis sample as the denominator, and take the loss amount of volatile oil in Angelica sinensis from 1 to 1.5 h of drying, 0.03%, as the numerator to calculate the loss rate of volatile oil in Angelica sinensis from 1 to 1.5 h of drying, and obtain the loss rate of volatile oil in Angelica sinensis from 1 to 1.5 h of drying, 0.06% / h.

[0045] When the loss rate of volatile oil in Angelica sinensis ≥ 0.05% / h, increase the humidity of the oven by 3%, and continue to dry the Angelica sinensis.

[0046] Step 7: Repeat the above steps, select the Angelica sinensis sample at intervals of 0.5 h, detect the actual content of volatile oil in the Angelica sinensis sample, calculate the loss amount and loss rate of volatile oil in Angelica sinensis in each time period until the drying is completed.

[0047] The loss amount and loss rate of the volatile oil of Angelica sinensis are calculated by the above method, and the humidity of the oven is regulated twice according to the loss amount and loss rate of the volatile oil of Angelica sinensis, so as to achieve the purpose of verifying and correcting the humidity regulation of the oven and prevent excessive loss of the volatile oil of Angelica sinensis.

[0048] The drying regulation system for 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 40°, the system detects the composition ratio and evaporation rate of the volatile oil of Angelica sinensis in the mixed gas of water vapor and volatile oil through the gaseous detection unit, calculates the evaporation amount of the volatile oil of Angelica sinensis, and the humidity control unit dynamically regulates the humidity of the oven based on the evaporation amount and evaporation rate of the volatile oil of Angelica sinensis in the mixed gas of water vapor and volatile oil to accelerate the evaporation of the surface moisture of Angelica sinensis. At the same time, the solid-state detection unit intermittently detects the actual content of the moisture and the volatile oil components of the Angelica sinensis sample taken from the oven, calculates the loss amount and loss rate of the volatile oil of Angelica sinensis, and the humidity control unit regulates the humidity of the oven twice based on the loss amount and loss rate of the volatile oil of Angelica sinensis, so as to achieve the purpose of verifying and correcting the humidity regulation of the oven, prevent excessive loss of the volatile oil of Angelica sinensis, accurately control the humidity of the oven, improve the drying efficiency of Angelica sinensis, and retain the content of the volatile oil components of Angelica sinensis.

[0049] The above is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered by the protection scope of the present invention.

Claims

1. A drying control system for traditional Chinese medicinal materials, characterized in that, Including: A volatile oil real-time monitoring module, a temperature and humidity control module, and a numerical control module. Among them, the volatile oil real-time monitoring module intermittently detects the Angelica sinensis samples taken from the oven to obtain the actual content of the moisture in Angelica sinensis and the components of the volatile oil in Angelica sinensis; the volatile oil real-time monitoring module real-time monitors the composition ratio of the volatile oil in Angelica sinensis in the mixed gas of water vapor and volatile oil, and calculates the evaporation amount of the volatile oil in Angelica sinensis; the volatile oil real-time monitoring module calculates the loss amount and loss rate of the volatile oil in Angelica sinensis based on the actual content of the volatile oil components in Angelica sinensis and the evaporation amount of the volatile oil in Angelica sinensis; the temperature and humidity control module real-time monitors the temperature and humidity in the oven, and maintains the oven temperature at a constant 40°; the temperature and humidity control module dynamically adjusts the oven humidity based on the loss amount and loss rate of the volatile oil in Angelica sinensis, improves the drying efficiency of Angelica sinensis, and retains the volatile oil components in Angelica sinensis; the numerical control module real-time records the system operation data, and feeds back the system operation data to the system terminal for the staff to view; The temperature and humidity control module includes a sensor unit, a temperature control unit, a humidity control unit, and a humidity threshold protection unit. Among them, the sensor unit is used to real-time monitor the oven temperature and humidity; the temperature control unit uses a PID controller to maintain the oven temperature at a constant 40°C; the humidity control unit dynamically adjusts the oven humidity based on the loss amount of the volatile oil in Angelica sinensis to improve the drying efficiency; the humidity threshold protection unit compensates the oven humidity based on the loss rate of the volatile oil in Angelica sinensis to prevent excessive loss of the volatile oil in Angelica sinensis, and the loss rate threshold of the volatile oil in Angelica sinensis is ≥0.05% / h; the method for the humidity control unit to dynamically adjust the oven humidity is as follows: Step 1, initial high-humidity stage: The oven humidity is 50%-60%, and the enthalpy value of the high-humidity air is used to improve the moisture evaporation efficiency, prevent the epidermis of Angelica sinensis from hardening too quickly, and promote the outward migration of internal moisture; Step 2, middle-stage gradient dehumidification stage: The oven humidity is adjusted to 30%-40% to accelerate the evaporation of surface moisture, and the sensor unit real-time monitors the humidity in the oven to avoid the rapid escape of volatile oil with steam due to the humidity <30%; Step 3, final low-humidity shaping stage: Samples are taken to detect the actual content of the moisture in Angelica sinensis and the components of the volatile oil in Angelica sinensis. When the moisture content of Angelica sinensis drops below 20%, the oven humidity is adjusted to 20%-25% to quickly remove the residual moisture and shorten the drying cycle; when the loss rate of the volatile oil in Angelica sinensis ≥0.05% / h, the oven humidity is adjusted to increase by 3% to prevent excessive loss of the volatile oil in Angelica sinensis.

2. The drying control system for a traditional Chinese medicine according to claim 1, characterized in that, The volatile oil real-time monitoring module includes a gaseous detection unit and a solid detection unit. Among them, the gaseous detection unit is used to detect the mixed gas of water vapor and volatile oil, and analyze the composition ratios of water vapor and Angelica sinensis volatile oil in the mixed gas; the gaseous detection unit calculates the evaporation amounts of water vapor and Angelica sinensis volatile oil based on the evaporation rate of the mixed gas of water vapor and volatile oil; the solid detection unit is used to detect the Angelica sinensis samples taken from the oven at intervals, and obtain the actual contents of the water content and volatile oil components of Angelica sinensis; the solid detection unit calculates the drying efficiency of the water content of Angelica sinensis based on the actual content of the water content of Angelica sinensis; the solid detection unit calculates the loss amount and loss rate of Angelica sinensis volatile oil based on the actual content of the volatile oil components of Angelica sinensis.

3. The drying control system for a traditional Chinese medicine according to claim 2, wherein, The gaseous detection unit includes a QCM sensor and a conductive polymer sensor. The QCM sensor and the conductive polymer sensor array are in the gas collecting hood located above the oven, and are used to monitor in real time the composition ratios of water vapor and Angelica sinensis volatile oil in the mixed gas of water vapor and volatile oil in the oven, and feedback the composition ratio data of water vapor and Angelica sinensis volatile oil to the numerical control module for storage.

4. A drying control system for traditional Chinese medicinal materials according to claim 2, characterized in that, The solid detection unit uses an integrated miniaturized chromatographic column and a mass spectrometer detector to detect the actual contents of the water content and volatile oil components of the Angelica sinensis samples taken out from the oven. The interval sampling and detection time of the Angelica sinensis samples in the oven is 0.5 h.

5. The drying control system for a traditional Chinese medicine material according to claim 1, wherein, The sensor unit includes several temperature and humidity sensors, and several of the temperature and humidity sensors are evenly distributed inside the oven for real-time monitoring of the oven temperature and humidity.

6. The drying control system for a traditional Chinese medicine material according to claim 2, characterized in that, The method for the solid detection unit to calculate the loss amount and loss rate of Angelica sinensis volatile oil is as follows: Step 1: Randomly select fresh Angelica sinensis as the sample, and detect the initial content of volatile oil in the fresh Angelica sinensis sample; Step 2: After drying for 0.5 h, randomly select the Angelica sinensis in the oven as the sample, detect the actual content of volatile oil in the Angelica sinensis sample, obtain the actual content of volatile oil in Angelica sinensis after drying for 0.5 h, and calculate the difference between the initial content of volatile oil in Angelica sinensis and the actual content of volatile oil in Angelica sinensis after drying for 0.5 h to obtain the loss amount of volatile oil in Angelica sinensis during 0 - 0.5 h of drying; Step 3: Use the interval time of 0.5 h for selecting and detecting the Angelica sinensis sample as the denominator, and use the loss amount of volatile oil in Angelica sinensis during 0 - 0.5 h of drying as the numerator to calculate the loss rate of volatile oil in Angelica sinensis during 0 - 0.5 h of drying; Step 4: After drying for 1 h, randomly select the Angelica sinensis in the oven as the sample, detect the actual content of volatile oil in the Angelica sinensis sample, obtain the actual content of volatile oil in Angelica sinensis after drying for 1 h, and calculate the difference between the actual content of volatile oil in Angelica sinensis after drying for 0.5 h and the actual content of volatile oil in Angelica sinensis after drying for 1 h to obtain the loss amount of volatile oil in Angelica sinensis during 0.5 - 1 h of drying; Step 5: Use the interval time of 0.5 h for selecting and detecting the Angelica sinensis sample as the denominator, and use the loss amount of volatile oil in Angelica sinensis during 0.5 - 1 h of drying as the numerator to calculate the loss rate of volatile oil in Angelica sinensis during 0.5 - 1 h of drying; Step 6: Repeat the above steps to calculate the loss rates of volatile oil in Angelica sinensis in each time period.

7. The drying control system for a traditional Chinese medicine according to claim 1, wherein The numerical control module includes a data storage unit, a control unit, and an acoustic-optic warning unit. Among them, 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 moisture exhaust fan and the humidifier to adjust the humidity of the oven, improve the drying efficiency, and retain the volatile oil components; the acoustic-optic warning unit warns the staff according to the loss rate of the volatile oil of angelica. When the loss rate of the volatile oil of angelica ≥ 0.05% / h, the acoustic-optic warning unit works to issue a buzzer alarm and a visual warning.

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