Traditional Chinese medicine hot reflux extraction equipment and extraction process control method

Abstract

The present application relates to a traditional Chinese medicine hot reflux extraction device and an extraction process control method, which achieves stable control of the concentration of the extraction solvent during the hot reflux extraction process of traditional Chinese medicine, and achieves stable control of the quality of the concentrated extract, thereby achieving the goals of improving extraction efficiency, ensuring the stability of the extract quality, and reducing energy consumption. The present invention uses an online detection system to achieve online detection of the alcohol content of the solution in the tank. By configuring the ethanol preparation tank to adjust the concentration of the added ethanol online, the concentration of the ethanol solvent in the tank can be accurately controlled, thereby ensuring the stability of the quality of the hot reflux extract.

Description

Technical Field

[0001] The invention belongs to the field of traditional Chinese medicine pharmacy, and specifically relates to traditional Chinese medicine heat reflux extraction equipment and an extraction process control method. Background Art

[0002] Traditional Chinese medicine (TCM) extraction refers to the process of dissolving, separating, and purifying the active ingredients from TCM materials. Traditional extraction methods include decoction, maceration, percolation, reflux, solvent extraction, steam distillation, and sublimation. Hot reflux extraction, in particular, often uses organic solvents such as ethanol. This solvent is used to extract the active ingredients from the TCM, while the evaporated solvent is then used for further extraction. This maintains a high gradient between the concentration of soluble substances in the medicinal material and the solvent, thereby improving extraction efficiency.

[0003] The existing hot reflux extraction and concentration method still has some shortcomings: the Chinese medicine extraction process adopts reflux extraction, and the solubility of the active ingredients is poor; the extract in the reflux extraction directly enters the concentrator for concentration. If the content of the active ingredient in the extract is low at this time, it will cause energy waste. If the content of the active ingredient in the extract is high, it may be that the extraction time is too long in the extraction process, which reduces the extraction efficiency; as the solution evaporates during the extraction process, the ethanol concentration in the extract changes, and the concentration of the recovered ethanol solvent after concentration and evaporation is unstable, which affects the extraction efficiency and even affects the quality of the final product. Summary of the Invention

[0004] The purpose of the present invention is to provide a traditional Chinese medicine hot reflux extraction device and an extraction process control method to achieve stable control of the concentration of the extraction solvent in the traditional Chinese medicine hot reflux extraction process and stable control of the quality of the concentrated extract, thereby achieving the goals of improving extraction efficiency, ensuring the stability of the extract quality and reducing energy consumption.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A traditional Chinese medicine hot reflux extraction device, comprising:

[0007] Extraction tank, condenser, high-concentration ethanol storage tank, drinking water tank, ethanol preparation tank, duplex filter, online detection system, concentrator and controller;

[0008] The extraction tank is used to feed medicinal materials and extraction solvent, and the extraction tank is heated by steam; the extraction solvent evaporated in the extraction tank is collected by the condenser; an online temperature sensor and an online liquid level sensor are provided on one side of the extraction tank;

[0009] The liquid inlet of the ethanol preparation tank is connected to the condenser, the high-concentration ethanol storage tank, and the liquid outlet of the drinking water tank, respectively. The liquid outlet of the high-concentration ethanol storage tank is provided with a high-concentration ethanol online flowmeter, and the liquid outlet of the drinking water tank is provided with a drinking water online flowmeter. The liquid outlet of the ethanol preparation tank is connected to the top of the extraction tank to pass the prepared ethanol into the extraction tank.

[0010] The liquid outlet of the extraction tank is connected to a duplex filter, the liquid outlet of the duplex filter is connected to a circulation pipeline, the other end of which is connected to the liquid inlet of the extraction tank; the liquid outlet of the extraction tank is also connected to the concentrator, and the pipeline connecting the extraction tank and the concentrator is provided with a concentrator liquid inlet valve and an online flow meter for the extracted liquid;

[0011] The circulation pipeline includes a circulation valve I, a circulation pump, and an online detection system; the circulation valve I is arranged in the main line of the circulation pipeline and is used to control the opening or closing of the circulation pipeline; the online detection system includes a detection pool, a detection probe is provided in the detection pool, and the online detection system is connected to the main line of the circulation pipeline through a detection branch. The online detection system can measure the ethanol concentration A and solid content of the extract in the detection pool in real time through the detection probe;

[0012] The concentrator is used to evaporate and concentrate the extract, and the top of the concentrator is connected to the air inlet of the condenser through a pipeline;

[0013] The controller is used to obtain parameters of all flow meters and control the opening and closing of each valve.

[0014] Preferably, in the traditional Chinese medicine hot reflux extraction device of the present invention, a probe mounting hole is provided at the bottom of the detection tank, and the probe mounting hole is perpendicular to the side wall of the detection tank; the detection probe is a near-infrared probe, which is embedded in the probe mounting hole and is close to the outer side wall of the detection tank;

[0015] An air jet mechanism is also provided at the bottom of the detection pool, and the air jet mechanism comprises:

[0016] The jet channel is formed at the bottom of the detection tank and has a stirring jet hole aimed at the top of the bottom surface of the detection tank and a probe cleaning jet hole aimed at the detection probe; the air inlet of the jet channel is connected to the air supply pipe; the probe cleaning jet hole is oriented at an angle of ~ degrees relative to the surface of the detection probe, and the probe cleaning jet hole is arranged at a position on the inner side of the side wall of the detection tank near the probe mounting hole.

[0017] Preferably, the Chinese medicine heat reflux extraction equipment of the present invention, the concentrator comprises:

[0018] a heater connected to the duplex filter and used for heating the extract;

[0019] An evaporator is connected to the heater and is used to pass the steam generated by the heater into the condenser.

[0020] Preferably, in the traditional Chinese medicine heat reflux extraction equipment of the present invention, an online density sensor is provided between the heater and the evaporator.

[0021] A method for controlling a traditional Chinese medicine heat reflux extraction process comprises the following steps:

[0022] S1, put the medicinal materials into the extraction tank, add ethanol solution, pass industrial steam into the extraction tank, and start heating;

[0023] S2, after the extract in the extraction tank passes through the double filter from the liquid outlet, it returns to the extraction tank through the circulation pipeline, and an online detection system is set on the branch of the circulation pipeline to measure the ethanol concentration A and solid content of the extract in the detection cell in real time;

[0024] S3, during the extraction process, the volume L of the solution in the extraction tank is monitored in real time by the online liquid level sensor, and the volume L of the ethanol solution to be added is calculated by the controller a and concentration A a , calculate the volume of high concentration ethanol L3 and drinking water L4 to be added;

[0025] S4, when the online detection system detects the solid content and the total astragaloside content in the extract reaching the set value, the circulation pipeline is closed, the concentrator inlet valve is opened, and the concentrator is used to perform the concentration process of the extract.

[0026] Preferably, in the method for controlling the hot reflux extraction process of traditional Chinese medicine of the present invention, in step S3, the high-concentration ethanol outlet valve is opened, and the volume of the added high-concentration ethanol is measured using a high-concentration ethanol online flowmeter, and the high-concentration ethanol outlet valve is closed when the required amount is reached; the drinking water outlet valve is opened, and the volume of the added drinking water is measured using a drinking water online flowmeter, and the drinking water outlet valve is closed when the required amount is reached;

[0027] L3= / A h ;

[0028] L4 = L1–L-L2-L3;

[0029] Where: Before ethanol preparation, the volume of the liquid in the ethanol preparation tank is L2, in liters; the ethanol concentration is A2, in volume concentration %; the concentration of high concentration ethanol is A h; The water absorption coefficient x of the medicinal material, in liters / kilogram, is obtained through experiments; the volume of the ethanol solution added in step S1 is L0, the concentration is A0, the weight of the added medicinal material is M, and when the online temperature sensor detects that the temperature in the extraction tank reaches the extraction temperature, the volume of the mixed solution in the extraction tank measured by the online liquid level sensor is L1.

[0030] Preferably, in the method for controlling the hot reflux extraction process of traditional Chinese medicine of the present invention, in step S4, when the online detection system detects the solid content and the set value of the total saponin content of astragalus in the extract, the time T0 from the heat preservation extraction to the active ingredient content in the extract reaching the set value is measured;

[0031] When the new round of extraction time is greater than 2T0, and the online detection system detects that the solid content S and the active ingredient content in the extract have not reached the set value, it is determined that the extraction has reached the extraction end point.

[0032] Preferably, the method for controlling the hot reflux extraction process of traditional Chinese medicine of the present invention further comprises a maintenance step of the online detection system: performing jet cleaning on the detection probe of the online detection system through the jet mechanism.

[0033] Preferably, the traditional Chinese medicine hot reflux extraction process control method of the present invention uses the traditional Chinese medicine hot reflux extraction equipment as described in claim 2, and starts an air jet process before step S2 to jet-stir the extract in the detection pool and jet-clean the detection probe.

[0034] Preferably, in the method for controlling the hot reflux extraction process of traditional Chinese medicine of the present invention, in step S4, an online flow meter for the extract is used to measure the volume of the extract added to the heater. When the cumulative volume of the extract added to the heater reaches L0 / 2, the concentrator liquid inlet valve is closed, and circulation valve I and circulation valve II are opened.

[0035] The beneficial effects of the present invention are:

[0036] (1) A circulating pump is used to realize the external circulation of the extract, thereby playing the role of stirring the solution in the tank and increasing the dissolution and diffusion rate of the active ingredients;

[0037] (2) An online detection system is used to detect the alcohol content of the solution in the tank online. The concentration of ethanol added is adjusted online in the ethanol preparation tank to achieve precise control of the concentration of ethanol solvent in the tank, thereby ensuring the stability of the quality of the hot reflux extract;

[0038] (3) An online detection system is used to realize online detection of the content of effective ingredients, and to achieve segmented and continuous concentration of the extract, effectively reducing energy consumption;

[0039] (4) Use controllers to control all valves, instruments and pumps to achieve automatic control, reduce manual operation, avoid operating errors and reduce labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The technical solution of the present application is further described below with reference to the accompanying drawings and embodiments.

[0041] Figure 1 This is a structural diagram of a control system for the hot reflux extraction process of traditional Chinese medicine according to an embodiment of the present application;

[0042] Figure 2 This is a flow chart of the control method for the hot reflux extraction process of traditional Chinese medicine in an embodiment of the present application;

[0043] Figure 3 This is a schematic diagram of the detection pool structure of the online detection system of an embodiment of the present application;

[0044] Figure 4 yes Figure 3 A partial enlarged view of .

[0045] The reference numerals in the figures are:

[0046] 1-extraction tank, 101-extraction tank steam regulating valve, 102-extraction tank steam trap, 103-medicinal material feed port, 104-extraction solvent feed valve, 105-extraction tank liquid outlet valve, 106-online temperature sensor, 107-online liquid level sensor;

[0047] 2-condenser, 201-cooling water inlet valve, 202-cooling water outlet valve;

[0048] 3-high concentration ethanol storage tank, 301-high concentration ethanol liquid outlet valve, 302-high concentration ethanol online flow meter;

[0049] 4-drinking water tank, 401-drinking water outlet valve, 402-drinking water online flow meter;

[0050] 5-ethanol preparation tank, 501-ethanol preparation tank outlet valve, 502-online liquid level gauge, 503-online alcohol content sensor, 504-ethanol preparation tank stirring motor;

[0051] 6-Double filter, 601-Double filter outlet valve, 602-circulation pump, 603-Double filter drain valve, 604-Concentrator inlet valve, 605-Circulation valve I, 606-Extraction liquid online flow meter;

[0052] 7-online detection system, 701-detection pool, 702-detection probe, 703-circulation valve II;

[0053] 8-concentrator, 801-heater, 802-evaporator, 803-concentrator steam regulating valve, 804-concentrator steam trap, 805-concentrator liquid outlet valve, 806-online density sensor;

[0054] 9-Controller. DETAILED DESCRIPTION

[0055] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0056] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0057] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood based on the specific circumstances. In this embodiment, if the X, Y, Z directions or the X, Y, Z axes are involved, they are all based on the Cartesian coordinate system.

[0058] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0059] Example 1:

[0060] This embodiment provides a Chinese medicine heat reflux extraction device, such as Figure 1 Shown, including:

[0061] Extraction tank 1, condenser 2, high-concentration ethanol storage tank 3, drinking water tank 4, ethanol preparation tank 5, duplex filter 6, online detection system 7, concentrator 8 and controller 9;

[0062] The extraction tank 1 is used to feed medicinal materials and extraction solvent. The extraction tank 1 is heated by steam. The extraction solvent evaporated in the extraction tank 1 is collected by the condenser 2. An online temperature sensor 106 and an online liquid level sensor 107 are provided on one side of the extraction tank 1.

[0063] The liquid inlet of the ethanol preparation tank 5 is connected to the liquid outlets of the condenser 2, the high-concentration ethanol storage tank 3, and the drinking water tank 4, respectively. A high-concentration ethanol online flowmeter 302 is provided at the liquid outlet of the high-concentration ethanol storage tank 3, and a drinking water online flowmeter 402 is provided at the liquid outlet of the drinking water tank 4. The liquid outlet of the ethanol preparation tank 5 is connected to the top of the extraction tank 1 to pass the prepared ethanol into the extraction tank 1.

[0064] The liquid outlet of the extraction tank 1 is connected to a duplex filter 6, which is connected to a circulation pipeline. The other end of the circulation pipeline is connected to the liquid inlet of the extraction tank 1. The liquid outlet of the extraction tank 1 is also connected to the concentrator 8. The pipeline connecting the extraction tank 1 and the concentrator 8 is provided with a concentrator inlet valve 604 and an extract online flow meter 606.

[0065] The circulation pipeline includes a circulation valve I 605, a circulation pump 602, and an online detection system 7; the circulation valve I 605 is arranged in the main line of the circulation pipeline and is used to control the opening or closing of the circulation pipeline; the online detection system 7 includes a detection cell 701, a detection probe 702 is provided in the detection cell 701, and the online detection system 7 is connected to the main line of the circulation pipeline through a detection branch. The online detection system 7 can measure the ethanol concentration A and solid content of the extract in the detection cell 701 in real time through the detection probe 702;

[0066] The concentrator 8 is used to evaporate and concentrate the extract, and the top of the concentrator 8 is connected to the air inlet of the condenser 2 through a pipeline;

[0067] The controller 9 is used to obtain parameters of all flow meters and control the opening and closing of each valve.

[0068] The traditional Chinese medicine hot reflux extraction equipment of this embodiment uses a circulation pipeline and is provided with an online detection system 7. It can measure the ethanol concentration A and solid content of the extract in the detection pool 701 in real time during the extraction process. By adjusting the configuration of adding ethanol concentration online through the ethanol preparation tank, the concentration of ethanol solvent in the tank can be accurately controlled, thereby ensuring the stability of the quality of the hot reflux extract.

[0069] Preferably, the Chinese medicine heat reflux extraction equipment of this embodiment is as follows Figure 3 、 4As shown, a probe mounting hole 7011 is provided at the bottom of the detection pool 701, and the probe mounting hole 7011 is perpendicular to the side wall of the detection pool 701; the detection probe 702 is a near-infrared probe, which is embedded in the probe mounting hole 7011 and is close to the outer side wall of the detection pool 701;

[0070] The bottom of the detection pool 701 is also provided with an air jet mechanism, which includes:

[0071] The jet channel 7012 is formed at the bottom of the detection tank 701 and has a stirring jet hole aligned with the bottom surface of the detection tank 701 and a probe cleaning jet hole aligned with the detection probe 702. The air inlet of the jet channel 7012 is connected to an air supply pipe 7013. The probe cleaning jet hole is oriented at an angle of 30 to 60 degrees relative to the surface of the detection probe 702 and is located on the inner side of the side wall of the detection tank 701 near the probe mounting hole 7011. The jet mechanism not only assists stirring, improving the accuracy of the online detection system 7 during detection, but also flushes the surface of the detection probe 702, preventing measurement errors caused by long-term uncleaning of the probe.

[0072] Preferably, in the Chinese medicine heat reflux extraction equipment of this embodiment, the concentrator 8 comprises:

[0073] A heater 801 connected to the duplex filter 6 for heating the extract;

[0074] The evaporator 802 is connected to the heater 801 and is used to pass the steam generated by the heater 801 into the condenser 2.

[0075] Preferably, in the traditional Chinese medicine hot reflux extraction equipment of this embodiment, an online density sensor 806 is provided between the heater 801 and the evaporator 802 .

[0076] This embodiment provides a method for controlling the hot reflux extraction process of Astragalus membranaceus. Figure 2 As shown:

[0077] 1. Parameter settings

[0078] Set the extraction temperature to 75-80°C on the controller 9; set the solid content in the extract to S and the total saponin content in the astragalus root to G, and then enter the "online concentration" process of the extract; set the density target value of the concentrate end point;

[0079] 2. Feeding and heating extraction

[0080] 500 kg (M) of pure Astragalus slices are put into the extraction tank 1 from the medicinal material feed port, the extraction solvent feed valve 104 is opened, 1500 liters (L0) of 55% (A0) ethanol solution is added, the extraction tank steam regulating valve 101 and the extraction tank drain valve 102 are opened, industrial steam is introduced into the extraction tank, and heating is started; the cooling water inlet valve 201 and the cooling water outlet valve 202 are opened, and the ethanol preparation tank outlet valve 501 is closed; the extraction tank outlet valve 105, the duplex filter outlet valve 601, the circulation pump 602, the circulation valve I 605, and the circulation valve II 703 are opened to allow the extract to return to the extraction tank 1 through the extraction tank filter, the extraction tank outlet valve 105, the duplex filter 6, the duplex filter outlet valve 601, the circulation pump 602, the circulation valve I 605, and the circulation valve II 703.

[0081] 3. Heat preservation extraction

[0082] When the online temperature sensor 106 detects that the temperature in the extraction tank reaches 75°C, the online liquid level sensor 107 is used to measure the volume L1 of the mixed solution in the extraction tank 1 at this time, the time is set, the heat preservation extraction is started, and the extraction tank steam regulating valve 101 is adjusted to keep the temperature in the tank at 75°C~80°C.

[0083] 4. Online detection

[0084] Close the circulation valve II 703 to allow the extract to flow through the detection pool 701 and return to the extraction tank 1. Use the detection probe 702 in the detection pool 701 to detect the ethanol concentration A, solid content, and total astragalus saponin content in the extract in real time.

[0085] 5. Preparation of ethanol concentration

[0086] During the extraction process, the online liquid level sensor 107 monitors the volume L of the solution in the extraction tank 1 in real time, and calculates the volume L of the ethanol solution to be added through the control system. a and concentration A a , calculate the volume L3 of high-concentration ethanol and the volume L4 of drinking water to be added; turn on the stirring motor of the ethanol preparation tank 5; open the high-concentration ethanol outlet valve 301, use the high-concentration ethanol online flowmeter 302 to measure the volume of high-concentration ethanol added, and close the high-concentration ethanol outlet valve 301 when the required amount is reached; open the drinking water outlet valve 401, use the drinking water online flowmeter 402 to measure the volume of drinking water added, and close the drinking water outlet valve 401 when the required amount is reached.

[0087] L3=(A0*L0-A*LA*M*x-L2*A2) / A h

[0088] L4=L1–L-L2-L3

[0089] Where: Before ethanol preparation, the volume of the liquid in the ethanol preparation tank is L2, in liters; the ethanol concentration is A2, in volume concentration %; the concentration of high concentration ethanol is A h ; The water absorption coefficient x of the medicinal material, in liters / kilogram, is obtained through experiments.

[0090] 6. Online concentration

[0091] When the online detection system 7 detects the set value of the solid content and the total astragalosides content in the extract, the time T0 from the heat preservation extraction to the solid content and the total astragalosides content in the extract reaching the set value is measured;

[0092] Close circulation valve I 605, open concentrator inlet valve 604, concentrator steam regulating valve 803, and concentrator drain valve 804, and the extract will flow through the extraction tank filter, extraction tank outlet valve, duplex filter, duplex filter outlet valve, circulation pump, and concentrator inlet valve into heater 801. The volume of extract added to the heater is measured using extract online flow meter 606. When the cumulative volume of extract added to the heater reaches 600 liters, close concentrator inlet valve 604.

[0093] The extract begins to be concentrated. The extract enters the evaporator 802 from the heater 801. The evaporated steam enters the condenser 2 through the pipeline and is condensed into liquid and enters the ethanol preparation tank 5.

[0094] Open the circulation valve I 605 and repeat "4. Preparation of ethanol concentration" to add extraction solvent to the extraction tank 1. When the temperature in the tank rises to 75°C, restart the timing.

[0095] 7. Extraction endpoint

[0096] When the new round of extraction time is greater than 2T0, and the online detection system detects that the solid content S and the total astragalus saponin content in the extract have not reached the set value, it is determined that the extraction has reached the extraction endpoint;

[0097] Close the steam regulating valve of the extraction tank, the liquid outlet valve of the ethanol preparation tank, the stirring motor of the ethanol preparation tank, the circulation valve I, and the circulation valve II;

[0098] Open the concentrator liquid inlet valve to concentrate the extract. When the density of the concentrated liquid reaches the set value, close the concentrator steam regulating valve and enter the next process section.

[0099] Based on the above-mentioned ideal embodiments of this application, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the scope of the technical concept of this application. The technical scope of this application is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A method for controlling a traditional Chinese medicine heat reflux extraction process, characterized in that: The following steps are involved: S1, putting the medicinal materials into the extraction tank (1), adding ethanol solution, passing industrial steam into the extraction tank, and starting heating; S2, after the extract in the extraction tank (1) is passed through the double filter (6) from the liquid outlet, it is returned to the extraction tank (1) through the circulation pipeline, and an online detection system (7) is set on the branch of the circulation pipeline to measure the ethanol concentration A and solid content of the extract in the detection tank (701) in real time; S3, during the extraction process, the volume L of the solution in the extraction tank is monitored in real time by the online liquid level sensor (107), and the volume L of the ethanol solution to be added is calculated by the controller (9) a and concentration A a , calculate the volume of high concentration ethanol L3 and drinking water L4 to be added; S4, when the online detection system detects the solid content and the total astragalus saponin content in the extract reaching the set value, the circulation pipeline is closed, the concentrator inlet valve is opened, and the concentrator (8) is used to perform the concentration process of the extract; In step S3, the high-concentration ethanol outlet valve is opened, and the volume of the added high-concentration ethanol is measured using a high-concentration ethanol online flowmeter. When the required amount of ethanol is reached, the high-concentration ethanol outlet valve is closed; the drinking water outlet valve is opened, and the volume of the added drinking water is measured using a drinking water online flowmeter. When the required amount of ethanol is reached, the drinking water outlet valve is closed; <h2 style=";text-align:left;direction:ltr">L3 = (A0*L0 - A*L - A*M*x - L2*A2) / A<h2 style=";text-align:left;direction:ltr"> h <h2 style=";text-align:left;direction:ltr"> ; L4 = L1 – L - L2 - L3; Where: Before ethanol preparation, the volume of the liquid in the ethanol preparation tank is L2, in liters; the ethanol concentration is A2, in volume concentration%; the concentration of high-concentration ethanol is A h The water absorption coefficient x of the medicinal material is expressed in liters / kilograms and is obtained through experiments. The volume of the ethanol solution added in step S1 is L0, the concentration is A0, the weight of the added medicinal material is M, and when the online temperature sensor (106) detects that the temperature in the extraction tank (1) reaches the extraction temperature, the volume of the mixed solution in the extraction tank measured by the online liquid level sensor (107) is L1.

2. The method for controlling the hot reflux extraction process of traditional Chinese medicine according to claim 1, wherein: A Chinese medicine hot reflux extraction device is used for Chinese medicine hot reflux extraction, and the Chinese medicine hot reflux extraction device comprises: Extraction tank (1), condenser (2), high-concentration ethanol storage tank (3), drinking water tank (4), ethanol preparation tank (5), duplex filter (6), online detection system (7), concentrator (8) and controller (9); The extraction tank (1) is used for feeding medicinal materials and extraction solvent, and the extraction tank (1) is heated by steam; the extraction solvent evaporated in the extraction tank (1) is collected by the condenser (2); an online temperature sensor (106) and an online liquid level sensor (107) are provided on one side of the extraction tank (1); The liquid inlet of the ethanol preparation tank (5) is connected to the liquid outlets of the condenser (2), the high-concentration ethanol storage tank (3) and the drinking water tank (4), respectively; a high-concentration ethanol online flow meter (302) is provided at the liquid outlet of the high-concentration ethanol storage tank (3), and a drinking water online flow meter (402) is provided at the liquid outlet of the drinking water tank (4); the liquid outlet of the ethanol preparation tank (5) is connected to the top of the extraction tank (1) for passing the prepared ethanol into the extraction tank (1); The liquid outlet of the extraction tank (1) is connected to a duplex filter (6), the liquid outlet of the duplex filter (6) is connected to a circulation pipeline, the other end of which is connected to the liquid inlet of the extraction tank (1); the liquid outlet of the extraction tank (1) is also connected to the concentrator (8), and a concentrator liquid inlet valve (604) and an extract online flow meter (606) are provided on the pipeline connecting the extraction tank (1) and the concentrator (8); The circulation pipeline includes a circulation valve I (605), a circulation pump (602), and an online detection system (7); the circulation valve I (605) is arranged in the main line of the circulation pipeline and is used to control the opening or closing of the circulation pipeline; the online detection system (7) includes a detection pool (701), a detection probe (702) is provided in the detection pool (701), and the online detection system (7) is connected to the main line of the circulation pipeline through a detection branch line. The online detection system (7) can measure the ethanol concentration A and solid content of the extract in the detection pool (701) in real time through the detection probe (702); The concentrator (8) is used to evaporate and concentrate the extract, and the top of the concentrator (8) is connected to the air inlet of the condenser (2) through a pipeline; The controller (9) is used to obtain parameters of all flow meters and control the opening and closing of each valve.

3. The Chinese medicine heat reflux extraction process control method according to claim 2, characterized in that, A probe mounting hole (7011) is provided at the bottom of the detection pool (701), and the probe mounting hole (7011) is perpendicular to the side wall of the detection pool (701); the detection probe (702) is a near-infrared probe, and is embedded in the probe mounting hole (7011) and is close to the outer side wall of the detection pool (701); An air jet mechanism is also provided at the bottom of the detection pool (701), and the air jet mechanism comprises: An air jet channel (7012) is formed at the bottom of the detection tank (701), and has a stirring jet hole aligned with the bottom surface of the detection tank (701) and a probe cleaning jet hole aligned with the detection probe (702); the air inlet of the air jet channel (7012) is connected to an air supply pipe (7013); the probe cleaning jet hole is oriented at an angle of (30) to (60) degrees relative to the surface of the detection probe (702), and the probe cleaning jet hole is arranged at a position on the inner side of the side wall of the probe mounting hole (7011) close to the detection tank (701).

4. The method for controlling the hot reflux extraction process of traditional Chinese medicine according to claim 3, wherein: Before step S2, an air jet process is started to jet-stir the extract in the detection pool (701) and to jet-clean the detection probe (702).

5. The method for controlling the hot reflux extraction process of traditional Chinese medicine according to claim 3, wherein: The concentrator (8) comprises: A heater (801), connected to the duplex filter (6), for heating the extract; The evaporator (802) is connected to the heater (801) and is used to pass the steam generated by the heater (801) into the condenser (2).

6. The method for controlling the hot reflux extraction process of traditional Chinese medicine according to claim 5, wherein: An online density sensor (806) is provided between the heater (801) and the evaporator (802).

7. The method for controlling the hot reflux extraction process of traditional Chinese medicine according to claim 1, wherein: In step S4, when the online detection system detects the solid content and the total astragalus saponin content in the extract at the set value, the time T0 from the heat preservation extraction to the effective ingredient content in the extract reaching the set value is measured; When the new round of extraction time is greater than 2T0, and the online detection system detects that the solid content S and the active ingredient content in the extract have not reached the set value, it is determined that the extraction has reached the extraction end point.

8. The method for controlling the hot reflux extraction process of traditional Chinese medicine according to claim 1 or 7, wherein: The method also includes a maintenance step of the online detection system (7): performing jet cleaning on the detection probe (702) of the online detection system (7) through the jet mechanism.

9. The method for controlling the hot reflux extraction process of traditional Chinese medicine according to claim 8, characterized in that: In step S4, the volume of the extract added to the heater is measured using an extract online flow meter. When the cumulative volume of the extract added to the heater reaches L0 / 2, the concentrator inlet valve is closed and circulation valves I and II are opened.

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