A purification device and method for processing glycyrrhizinic acid

Abstract

The application relates to a kind of purification equipment and method for processing glycyrrhizic acid, including tank body, stirring shaft and stirring paddle are rotationally connected in tank body, and liquid distribution cavity is opened in the inside of stirring shaft;Uniformly set up with liquid distribution cavity communication liquid distribution hole on the side wall of stirring shaft, and liquid distribution assembly is arranged on liquid distribution hole;Slidably connected sealing plate is oppositely arranged in the liquid distribution cavity of the side of stirring shaft upper side, when stirring shaft rotates, the opening degree of liquid distribution cavity passage is controlled by centrifugal drive adjusting mechanism driving sealing plate to move radially to outside side;Liquid feeding pipe on the solvent tank of the side of tank body top is extended to liquid distribution cavity and rotationally connected with the inner wall of liquid distribution cavity.The opening degree of liquid feeding cavity is controlled by the rotation of stirring shaft, and then the liquid feeding amount is controlled, the dynamic cooperation of stirring speed and ethanol liquid feeding amount is realized, the mixing uniformity is significantly improved, local ethanol concentration is avoided to be too high or too low, glycyrrhizic acid crystallization is more uniform, impurity entrainment is reduced, and product purity is improved.

Description

Technical Field

[0001] This invention relates to the field of glycyrrhizic acid extraction technology, and in particular to a purification device and method for processing glycyrrhizic acid. Background Technology

[0002] In the alcohol precipitation process of glycyrrhizic acid extraction and purification, the uniformity of mixing between the feed solution and ethanol directly determines the nucleation state of the precipitate, the amount of impurities carried over, and the purity of the final product. In industrial production, ethanol is usually added to the concentrated extract under stirring. Ethanol reduces the polarity of the system, causing glycyrrhizic acid to precipitate out as a flocculent precipitate, thus achieving separation from water-soluble impurities such as polysaccharides, proteins, and pigments.

[0003] Existing alcohol precipitation equipment mostly adopts a conventional paddle agitator combined with fixed-point liquid addition from the top or side wall of the tank. Ethanol is added to the liquid system from one or a few fixed locations. Mixing is mainly achieved through convection and diffusion under agitation, which easily leads to localized areas of excessively high ethanol concentration near the addition point, while the ethanol concentration is low in areas far from the addition point, resulting in uneven alcohol concentration distribution within the system. Furthermore, the agitation speed and the ethanol addition rate are controlled independently, making dynamic matching impossible. When the agitation speed is increased to improve the mixing effect, if the ethanol addition rate is not increased simultaneously, excessive mixing intensity and insufficient ethanol supply can easily occur, prolonging the alcohol precipitation cycle. If the ethanol flow rate is simply increased, the mismatch between agitation shear and liquid distribution diffusion will further aggravate the localized excessive ethanol phenomenon. All of the above factors lead to insufficient overall mixing uniformity, resulting in incomplete alcohol precipitation reaction and affecting the quality and efficiency of precipitation. Based on this, a purification device and method for glycyrrhizic acid processing is proposed. Summary of the Invention

[0004] This invention provides a purification device and method for glycyrrhizic acid processing, which solves the problem mentioned in the above-mentioned technical background that in the existing glycyrrhizic acid purification equipment, the fixed method of adding alcohol and the mismatch between the stirring speed and the amount of liquid added easily lead to uneven mixing of ethanol and drug solution, resulting in insufficient alcohol precipitation reaction, which affects the quality and efficiency of precipitation.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a purification device for glycyrrhizic acid processing, comprising a tank body, a stirring shaft rotatably connected inside the tank body, a liquid distribution chamber being opened inside the stirring shaft, and a stirring paddle being fixedly provided on the outer wall of the stirring shaft; The stirring shaft has uniformly opened liquid distribution holes that communicate with the liquid distribution chamber on its side wall, and the stirring shaft has a liquid distribution assembly that is connected to the liquid distribution holes on its side wall. A slidably connected sealing plate is disposed opposite to the liquid distribution chamber on one side above the stirring shaft. The stirring shaft is provided with a centrifugal drive adjustment mechanism connected to the sealing plate. When the stirring shaft rotates, the centrifugal drive adjustment mechanism drives the sealing plate to move radially outward to increase the opening of the liquid distribution chamber channel. A solvent tank is fixedly installed on one side of the top of the tank, and a liquid addition pipe is fixedly installed on one side of the bottom of the solvent tank. The liquid addition pipe extends through the liquid distribution chamber and is rotatably connected to the inner wall of the liquid distribution chamber.

[0006] Preferably, the centrifugal drive adjustment mechanism includes a connecting plate connected to the outer wall of the stirring shaft via a first spring. One side of the sealing plate passes through the stirring shaft and is fixedly connected to the connecting plate. The two sealing plates abut against each other under the action of the first spring to seal the channel of the liquid distribution chamber. A first counterweight is fixedly provided on the outer side of the connecting plate. When the stirring shaft rotates, the centrifugal force generated by the first counterweight overcomes the elastic force of the first spring, causing the connecting plate and the sealing plate to slide outward, thereby controlling the opening of the channel of the liquid distribution chamber.

[0007] Preferably, a limiting groove is formed on the side wall of the stirring shaft, and a limiting rod is slidably connected in the limiting groove. One end of the limiting rod passes through the limiting groove and is fixedly connected to the connecting plate.

[0008] Preferably, the first spring is sleeved on the limiting rod located in the limiting groove.

[0009] Preferably, the liquid distribution assembly includes a nozzle rotatably connected to the side wall of the stirring shaft, and the nozzle is connected to the liquid distribution hole via a flexible hose.

[0010] Preferably, a rotating seat is fixedly connected to the side wall of the stirring shaft, a rotating shaft is rotatably connected inside the rotating seat, the nozzle is fixedly connected to the rotating shaft, and torsion springs are sleeved on both sides of the rotating shaft.

[0011] Preferably, the stirring paddle has a groove, a support rod is slidably connected in the groove, the support rod passes through the groove and is fixedly connected to a scraper, and a second spring is fixedly sleeved on the support rod.

[0012] Preferably, a second counterweight is fixed inside the scraper, and the scraper and the second counterweight are integrally formed. When the rotational speed of the stirring shaft reaches a set threshold, the centrifugal force generated by the second counterweight overcomes the elastic force of the second spring, causing the support rod and the scraper to slide outward along the slide groove, so that the scraper fits against the inner wall of the tank.

[0013] A purification method for glycyrrhizic acid processing includes the following steps: Step 1: Add the glycyrrhizic acid extract into the tank, ensuring that the distribution holes on the stirring shaft are below the liquid surface, and add ethanol into the solvent tank; Step 2: Add and mix ethanol. Control the stirring shaft to rotate rapidly. The centrifugal drive adjustment mechanism moves the sealing plate radially outward, opening the channel of the liquid distribution chamber to allow ethanol to enter. The ethanol is added to the extract through the liquid distribution component on the liquid distribution hole, achieving rapid and uniform mixing of ethanol and the liquid. This avoids excessively high local ethanol concentration. As the rotation speed increases, the opening of the liquid distribution chamber channel increases synchronously, and the amount of ethanol flowing into the liquid distribution chamber also increases with the increase of rotation speed. The stirring speed is matched with the amount of liquid added, making the overall mixing more uniform and improving the precipitation quality. Step 3: After the ethanol is added, control the stirring shaft to rotate at a low speed. As the rotation speed decreases, the sealing plate moves radially inward to reduce or close the opening of the liquid distribution chamber. The stirring paddle stirs the extract at a low speed to promote the aggregation and growth of precipitated particles. Step 4: Allow to settle. Stop the stirring shaft and let the sediment settle naturally.

[0014] The beneficial effects of the purification equipment and method for glycyrrhizic acid processing of the present invention are as follows: (1) This invention sets up a liquid distribution chamber on the stirring shaft and liquid distribution holes and liquid distribution components located below the liquid surface, so that ethanol is directly released into the turbulent zone near the stirring paddle in the liquid body, avoiding the formation of a local high alcohol concentration zone in the liquid surface area; at the same time, by setting up a sealing plate on the liquid distribution chamber that is driven by centrifugal force to adjust the opening of the liquid distribution chamber, the higher the rotation speed of the stirring shaft, the greater the distance the sealing plate moves to both sides, and the higher the ethanol inflow, thereby ensuring that the mixing capacity provided by the stirring and the amount of ethanol added are always in balance, so that the ethanol is evenly dispersed by the turbulence generated by the stirring at the moment of release. The combination of the two solves the problem of uneven mixing caused by the fixed liquid addition position and the independent control of the liquid addition amount and stirring speed in traditional equipment, which cannot be dynamically matched, eliminates local overconcentration, makes the alcohol precipitation reaction more complete, and the crystallization more uniform, thereby greatly improving the efficiency and effect of alcohol precipitation.

[0015] (2) The present invention sets a nozzle on the liquid distribution hole that can be driven to rotate by the centrifugal force generated by the rotation of the stirring shaft. When the stirring speed is high, the nozzle expands outward to a large angle, so that the ethanol covers a large area of ​​the tank in a fan shape. It works in conjunction with the high-intensity turbulence generated by the stirring paddle to achieve rapid and uniform dispersion of ethanol. When stirring at low speed, the nozzle automatically retracts to a small angle, and the ethanol is slowly released only from the vicinity of the liquid distribution hole, avoiding the impact on the already formed precipitate. It achieves adaptive adjustment of the higher the speed and the wider the liquid distribution, ensuring that the mixing intensity and the liquid distribution are always matched, and further improving the uniformity of mixing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 For the present invention Figure 2 Enlarged view of point a in the middle; Figure 4 For the present invention Figure 1 Enlarged view of point B in the middle; Figure 5 For the present invention Figure 1 Enlarged view of point C in the middle; Figure 6 This is a top view schematic diagram of the connection structure of the liquid distribution assembly on the stirring shaft of the present invention; Figure 7 This is a schematic diagram of the overall front view of the present invention.

[0017] In the diagram: 1. Tank body, 2. Stirring shaft, 3. Liquid distribution chamber, 4. Stirring paddle, 5. Liquid distribution hole, 6. Sealing plate, 7. Connecting plate, 8. First spring, 9. First counterweight, 10. Solvent tank, 11. Liquid addition pipe, 12. Limiting groove, 13. Limiting rod, 14. Nozzle, 15. Hose, 16. Rotating seat, 17. Rotating shaft, 18. Torsion spring, 19. Slide groove, 20. Support rod, 21. Scraper, 22. Second spring, 23. Second counterweight, 24. Drive motor. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] like Figures 1-7 As shown, a purification device for glycyrrhizic acid processing includes a tank 1, a feeding port on one side of the top of the tank 1, a stirring shaft 2 rotatably connected inside the tank 1, a liquid distribution chamber 3 opened inside the stirring shaft 2, a stirring paddle 4 fixedly provided on the outer wall of the stirring shaft 2, a drive motor 24 fixedly provided in the middle of the bottom of the tank 1, and the stirring shaft 2 passing through the tank 1 and fixedly connected to the output shaft of the drive motor 24. The stirring shaft 2 has uniformly opened liquid distribution holes 5 that communicate with the liquid distribution chamber 3 on its side wall. Multiple liquid distribution holes 5 are distributed along the axial and circumferential directions of the stirring shaft 2. The side wall of the stirring shaft 2 is provided with a liquid distribution assembly connected to the liquid distribution holes 5 to eliminate the radial concentration gradient at a single liquid addition point and ensure that ethanol and glycyrrhizic acid solution are uniformly mixed in a short time. Among them, the liquid distribution hole 5 is located below the liquid surface, and ethanol is directly released into the turbulent zone near the agitator in the liquid body without passing through the gas-liquid interface. This not only eliminates the generation of splashing and foam from the source, avoiding the loss of glycyrrhizic acid caused by foam adsorption, but also eliminates the physical basis for ethanol to accumulate on the liquid surface layer, avoiding the formation of local high alcohol concentration zones on the liquid surface. This allows the glycyrrhizic acid precipitation rate to be synchronized with the impurity precipitation rate, and the effective components will not be wrapped and co-precipitated by rapidly precipitated impurities, thereby improving the yield of glycyrrhizic acid.

[0020] A slidably connected sealing plate 6 is disposed in the liquid distribution chamber 3 on one side above the stirring shaft 2. The stirring shaft 2 is provided with a centrifugal drive adjustment mechanism connected to the sealing plate 6. When the stirring shaft 2 rotates, the centrifugal drive adjustment mechanism drives the sealing plate 6 to move radially outward to increase the opening of the liquid distribution chamber 3 channel. A solvent tank 10 is fixedly installed on one side of the top of the tank 1, and a liquid addition pipe 11 is fixedly installed on one side of the bottom of the solvent tank 10. The liquid addition pipe 11 extends through into the liquid distribution chamber 3 and is rotatably connected to the inner wall of the liquid distribution chamber 3. A solenoid valve is installed on the liquid addition pipe 11.

[0021] The centrifugal drive adjustment mechanism includes a connecting plate 7 connected to the outer wall of the stirring shaft 2 via a first spring 8. One side of the sealing plate 6 passes through the stirring shaft 2 and is fixedly connected to the connecting plate 7. The two sealing plates 6 abut against each other under the action of the first spring 8 to seal the channel of the liquid distribution chamber 3. A first counterweight 9 is fixedly provided on the outer side of the connecting plate 7. When the stirring shaft 2 rotates, the centrifugal force generated by the first counterweight 9 overcomes the elastic force of the first spring 8, causing the connecting plate 7 and the sealing plate 6 to slide outward, thereby controlling the opening of the channel of the liquid distribution chamber 3.

[0022] The first counterweight 9 generates centrifugal force as the stirring shaft 2 rotates, which is transmitted to the sealing plate 6 through the connecting plate 7. The centrifugal force is proportional to the square of the rotation speed. When the centrifugal force is greater than the preload of the first spring 8, the sealing plates 6 on both sides slide outward, releasing the seal and opening the liquid distribution chamber 3. As the rotation speed increases, the centrifugal force increases, the sealing plate 6 moves a greater distance outward, and the amount of liquid flowing between the sealing plates 6 increases accordingly, achieving a liquid distribution volume proportional to the rotation speed. When the rotation speed of the stirring shaft 2 increases, the turbulence intensity inside the tank increases, and the mixing capacity is enhanced. At this time, the liquid distribution volume increases simultaneously, and ethanol enters the tank at a larger flow rate, making full use of the mixing capacity of strong turbulence to achieve rapid and uniform dispersion of ethanol. When the rotation speed decreases, the mixing capacity weakens, and the liquid distribution volume decreases simultaneously to avoid excessive ethanol causing local concentration accumulation under weak mixing conditions. The two work together to improve the mixing uniformity and make the glycyrrhizic acid crystallization more uniform.

[0023] A limiting groove 12 is provided on the side wall of the stirring shaft 2. A limiting rod 13 is slidably connected in the limiting groove 12. One end of the limiting rod 13 passes through the limiting groove 12 and is fixedly connected to the connecting plate 7. The limiting groove 12 and the limiting rod 13 cooperate to constrain the movement of the sealing plate 6 in the radial straight direction to prevent deviation. A limiting plate is fixedly provided at one end of the limiting rod 13 located in the limiting groove 12 to prevent the limiting rod 13 from detaching from the limiting groove 12.

[0024] The first spring 8 is sleeved on the limiting rod 13 located in the limiting groove 12, reducing the space occupied by the first spring 8.

[0025] The liquid distribution assembly includes a nozzle 14 rotatably connected to the side wall of the stirring shaft 2. The nozzle 14 is connected to the liquid distribution hole 5 via a flexible hose 15. The flexible hose 15 has flexible and bendable characteristics, allowing the nozzle 14 to swing freely within a certain space.

[0026] A rotating seat 16 is fixedly connected to the side wall of the stirring shaft 2. A rotating shaft 17 is rotatably connected inside the rotating seat 16. The nozzle 14 is fixedly connected to the rotating shaft 17. Torsion springs 18 are sleeved on both sides of the rotating shaft 17.

[0027] When the stirring shaft 2 rotates, the nozzle 14 and the rotating shaft 17 rotate synchronously. The mass of the nozzle 14 (or the added counterweight) generates centrifugal force, which is radially outward. This centrifugal force generates an opening torque on the rotating shaft 17, causing the nozzle 14 to rotate outward around the shaft. The torsion spring 18 generates a restoring torque, which is opposite to the opening torque. As the rotational speed increases, the centrifugal force increases proportionally to the square of the rotational speed, and the opening torque increases accordingly. When the opening torque is greater than the restoring torque of the torsion spring, the nozzle 14 begins to rotate outward. The higher the rotational speed, the larger the deployment angle of the nozzle 14. During the alcohol addition stage, the stirring speed is high, and the nozzle expands outward to a large angle. Ethanol covers a large area of ​​the tank in a fan shape. This, combined with the high-intensity turbulence generated by the stirring paddle, achieves rapid and uniform dispersion of ethanol. During the crystal growth stage, the stirring speed is low, and the nozzle 14 automatically retracts to a small angle. Ethanol is slowly released only from near the distribution holes, avoiding impact on the already formed precipitate. This achieves adaptive adjustment of the higher the rotational speed and the wider the distribution, ensuring that the mixing intensity and the liquid distribution are always matched.

[0028] Meanwhile, the torsion spring 18 provides a continuous torque that balances the centrifugal force, so that the nozzle 14 can remain stable at the corresponding equilibrium angle at any rotation speed and will not oscillate due to minor disturbances.

[0029] The stirring paddle 4 has a groove 19 inside, and a support rod 20 is slidably connected inside the groove 19. The support rod 20 passes through the groove 19 and is fixedly connected to a scraper 21. A second spring 22 is fixedly sleeved on the support rod 20, and a limiting plate is provided on the support rod 20 to prevent the support rod 20 from detaching from the groove 19.

[0030] The scraper 21 is fixedly provided with a second counterweight 23. The scraper 21 and the second counterweight 23 are integrally set. When the rotation speed of the stirring shaft 2 reaches the set threshold, the centrifugal force generated by the second counterweight 23 overcomes the elastic force of the second spring 22, and drives the support rod 20 and the scraper 21 to slide outward along the slide groove 19, so that the scraper 21 fits against the inner wall of the tank 1.

[0031] The centrifugal force generated by the second counterweight is proportional to the square of the rotation speed. When the rotation speed of the stirring shaft 2 is lower than the set threshold, the centrifugal force is less than the elastic force of the second spring 22, and the scraper 21 remains contracted. When the rotation speed reaches the set threshold, the centrifugal force and the elastic force of the second spring 22 cause the scraper 21 to extend radially and adhere to the tank wall. The threshold is higher than the maximum working speed of the alcohol precipitation process, ensuring that the scraper 21 does not move during normal alcohol precipitation, so that the scraper 21 remains detached during alcohol precipitation, avoiding damage to the loose flocculent precipitate and ensuring filtration performance. After discharge or during cleaning, the rotation speed is increased, and the scraper 21 automatically extends to scrape off the residue on the tank wall, improving the discharge yield.

[0032] The bottom of the tank 1 is provided with an inclined guide block, and a discharge pipe is fixedly connected to the downward inclined position of the guide block. The discharge pipe is provided with a control valve to facilitate the smooth discharge of materials from the discharge pipe.

[0033] A purification method for glycyrrhizic acid processing includes the following steps: Step 1: Add the glycyrrhizic acid extract into the tank 1, so that the liquid distribution hole 5 on the stirring shaft 2 is below the liquid surface, and add ethanol into the solvent tank 10; Step 2: Add and mix ethanol. Open the solenoid valve on the liquid addition pipe 11 to control the stirring shaft 2 to rotate rapidly. The centrifugal drive adjustment mechanism drives the sealing plate 6 to move radially outward, opening the channel of the liquid distribution chamber 3 and allowing ethanol to enter the liquid distribution chamber 3. Ethanol enters the hose 15 and nozzle 14 through the liquid distribution hole 5 and is sprayed into the extract in the tank through the nozzle, achieving rapid and uniform mixing of ethanol and liquid, avoiding excessively high local ethanol concentration. As the rotation speed increases, the opening of the channel of the liquid distribution chamber 3 increases synchronously, and the amount of ethanol flowing into the liquid distribution chamber 3 also increases with the increase of rotation speed. At the same time, the nozzle 14 expands outward under the action of centrifugal force, and the sprayed ethanol covers a large area of ​​the tank in a fan shape. This works in conjunction with the high-intensity turbulence generated by the stirring paddle to achieve rapid and uniform dispersion of ethanol. The faster the speed, the larger the expansion angle, so that the stirring speed, the amount of liquid added, and the angle of the nozzle 14 are matched, making the overall mixing more uniform and improving the precipitation quality. Step 3: After the ethanol is added, control the stirring shaft 2 to rotate at a low speed. As the rotation speed decreases, the sealing plate 6 moves radially inward, reducing or closing the opening of the liquid distribution chamber 3. The stirring paddle 4 stirs the extract at a low speed, promoting the aggregation and growth of precipitated particles. At the same time, as the rotation speed decreases, the centrifugal force generated by the nozzle 14 decreases, and the torsion spring 18 drives the nozzle 14 to automatically retract to the closed state. The ethanol stops or is only slowly released from near the liquid distribution hole to avoid disturbing the precipitation. The slow flow generated by the low-speed stirring increases the probability of collision between particles, promoting the aggregation and growth of fine precipitated particles into larger flocculent precipitates.

[0034] Step 4: Allow to settle. Stop the stirring shaft 2 and let the sediment settle naturally. After settling, extract the supernatant from the feed port and discharge the sediment layer from the discharge pipe.

[0035] After sedimentation is complete, when cleaning the tank, add clean water or cleaning solution to the tank and control the stirring shaft 2 to rotate at a high speed, exceeding the maximum operating speed of the alcohol precipitation process. This ensures that the scraper 21 adheres to the tank 3 under centrifugal force, effectively cleaning the deposits on the tank wall and ensuring the cleanliness of the tank 1. The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A purification device for glycyrrhizic acid processing, comprising a tank, characterized in that: A stirring shaft is rotatably connected inside the tank. A liquid distribution chamber is opened inside the stirring shaft, and a stirring paddle is fixed on the outer wall of the stirring shaft. The stirring shaft has uniformly opened liquid distribution holes that communicate with the liquid distribution chamber on its side wall, and the stirring shaft has a liquid distribution assembly that is connected to the liquid distribution holes on its side wall. A slidably connected sealing plate is disposed opposite to the liquid distribution chamber on one side above the stirring shaft. The stirring shaft is provided with a centrifugal drive adjustment mechanism connected to the sealing plate. When the stirring shaft rotates, the centrifugal drive adjustment mechanism drives the sealing plate to move radially outward to increase the opening of the liquid distribution chamber channel. A solvent tank is fixedly installed on one side of the top of the tank, and a liquid addition pipe is fixedly installed on one side of the bottom of the solvent tank. The liquid addition pipe extends through the liquid distribution chamber and is rotatably connected to the inner wall of the liquid distribution chamber.

2. The purification equipment for glycyrrhizic acid processing according to claim 1, characterized in that: The centrifugal drive adjustment mechanism includes a connecting plate connected to the outer wall of the stirring shaft via a first spring. One side of the sealing plate passes through the stirring shaft and is fixedly connected to the connecting plate. The two sealing plates on both sides abut against each other under the action of the first spring to seal the channel of the liquid distribution chamber. A first counterweight is fixedly provided on the outer side of the connecting plate. When the stirring shaft rotates, the centrifugal force generated by the first counterweight overcomes the elastic force of the first spring, causing the connecting plate and the sealing plate to slide outward, thereby controlling the opening of the channel of the liquid distribution chamber.

3. The purification equipment for glycyrrhizic acid processing according to claim 2, characterized in that: A limiting groove is provided on the side wall of the stirring shaft, and a limiting rod is slidably connected in the limiting groove. One end of the limiting rod passes through the limiting groove and is fixedly connected to the connecting plate.

4. The purification equipment for glycyrrhizic acid processing according to claim 3, characterized in that: The first spring is sleeved on the limiting rod located in the limiting groove.

5. The purification equipment for glycyrrhizic acid processing according to claim 1, characterized in that: The liquid distribution assembly includes a nozzle rotatably connected to the side wall of the stirring shaft, and the nozzle is connected to the liquid distribution hole via a flexible hose.

6. The purification equipment for glycyrrhizic acid processing according to claim 5, characterized in that: A rotating seat is fixedly connected to the side wall of the stirring shaft, and a rotating shaft is rotatably connected inside the rotating seat. The nozzle is fixedly connected to the rotating shaft, and torsion springs are sleeved on both sides of the rotating shaft.

7. The purification equipment for glycyrrhizic acid processing according to claim 1, characterized in that: The stirring paddle has a groove, and a support rod is slidably connected in the groove. The support rod passes through the groove and is fixedly connected to a scraper. A second spring is fixedly sleeved on the support rod.

8. The purification equipment for glycyrrhizic acid processing according to claim 7, characterized in that: The scraper is fixedly provided with a second counterweight. The scraper and the second counterweight are integrally set. When the rotation speed of the stirring shaft reaches a set threshold, the centrifugal force generated by the second counterweight overcomes the elastic force of the second spring, driving the support rod and scraper to slide outward along the slide groove, so that the scraper fits against the inner wall of the tank.

9. A purification method for glycyrrhizic acid processing, based on the purification equipment for glycyrrhizic acid processing according to any one of claims 1 to 8, characterized in that: Includes the following steps: Step 1: Add the glycyrrhizic acid extract into the tank, ensuring that the distribution holes on the stirring shaft are below the liquid surface, and add ethanol into the solvent tank; Step 2: Add and mix ethanol. Control the stirring shaft to rotate rapidly. The centrifugal drive adjustment mechanism moves the sealing plate radially outward, opening the channel of the liquid distribution chamber to allow ethanol to enter. The ethanol is added to the extract through the liquid distribution component on the liquid distribution hole, achieving rapid and uniform mixing of ethanol and the liquid. This avoids excessively high local ethanol concentration. As the rotation speed increases, the opening of the liquid distribution chamber channel increases synchronously, and the amount of ethanol flowing into the liquid distribution chamber also increases with the increase of rotation speed. The stirring speed is matched with the amount of liquid added, making the overall mixing more uniform and improving the precipitation quality. Step 3: After the ethanol is added, control the stirring shaft to rotate at a low speed. As the rotation speed decreases, the sealing plate moves radially inward to reduce or close the opening of the liquid distribution chamber. The stirring paddle stirs the extract at a low speed to promote the aggregation and growth of precipitated particles. Step 4: Allow to settle. Stop the stirring shaft and let the sediment settle naturally.

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