Method and device for extracting natural plant extract

Abstract

The invention belongs to the technical field of plant extracts.The device comprises a smashing box, a filtering box, an extraction tank and a centrifugal pot, a circulating assembly is arranged on the outer side of the smashing box, a raw material storage box is arranged in the extraction tank, and net holes are formed in the outer wall face of the raw material storage box; a top cover is arranged at the top of the raw material storage box, a movable block in rotary connection is arranged above the top cover, telescopic rods are arranged on the two side wall faces in the extraction tank respectively, a containing ring is arranged between the telescopic rods on the two side wall faces, the raw material storage box is clamped in the containing ring and makes rotary contact with the containing ring, and a gear ring is arranged on the outer wall face of the raw material storage box in the circumferential direction; gears meshed with the gear rings are respectively arranged on the inner wall surfaces of the two sides of the extraction tank. According to the method and the device for extracting the natural plant extract, an efficient and energy-saving extraction process is realized, the quality and the yield of the natural plant extract are improved, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of plant extracts, in particular to a method and device for extracting natural plant extracts. Background Art

[0002] Natural plant extracts are widely used in medicine, food, cosmetics, and other fields. The advancement of their extraction processes directly determines product quality and economic benefits. Extraction is a key step in the production of natural plant extracts, obtaining the active ingredients from the plants. With the increasing demand for natural, green products, the quality and yield requirements for natural plant extracts are also increasing. However, existing extraction technologies and equipment have many shortcomings.

[0003] While existing extraction technologies are simple to operate, they suffer from low extraction efficiency, leading to high production costs. Furthermore, most existing devices offer incomplete extraction and low efficiency, resulting in inconsistent extract quality and making it difficult to meet the demands of diverse plant raw materials and diversified product offerings.

[0004] To solve the above problems, the present invention aims to provide a method and apparatus for extracting natural plant extracts, so as to improve extraction efficiency and product quality, reduce production costs, and meet the market demand for high-quality natural plant extracts. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and device for extracting natural plant extracts, so as to realize an efficient and energy-saving extraction process, improve the quality and yield of natural plant extracts, and reduce production costs.

[0006] To achieve the above-mentioned objectives, the present invention provides an extraction device for natural plant extracts, comprising a crushing box, a filtering box, an extraction tank, and a centrifugal tank. A circulation component is provided on the outside of the crushing box, a raw material storage box is provided in the extraction tank, and a mesh hole is provided on the outer wall of the raw material storage box. A top cover is provided on the top of the raw material storage box, and a rotatably connected moving block is provided above the top cover. Telescopic rods are respectively provided on the inner side walls of the extraction tank, and a placement ring is provided between the telescopic rods on the two side walls. The raw material storage box is clamped in the placement ring and is in rotational contact with the placement ring. A gear ring is provided along the circumferential direction on the outer wall of the raw material storage box, and gears meshing with the gear ring are respectively provided on the inner walls on both sides of the extraction tank.

[0007] Preferably, the telescopic end of the telescopic rod is connected to the outer wall of the placement ring, the outer wall of the raw material storage box is circumferentially provided with an annular clamping block, the placement ring is provided with a clamping groove corresponding to the annular clamping block, and the annular clamping block is clamped in the clamping groove.

[0008] Preferably, a connecting shaft is provided above the gear, a first bevel gear is sleeved on the outside of the connecting shaft, a motor is provided on the outer wall of the extraction tank, the output end of the motor passes through the side wall of the extraction tank, and is provided with a second bevel gear meshing with the first bevel gear.

[0009] Preferably, the crushing box is connected to the filter box, the filter box is connected to the extraction tank, and the extraction tank is connected to the centrifugal tank.

[0010] Preferably, a sliding rod is provided on the top of the extraction tank, a slider is provided on the sliding rod, the slider is slidably connected to the sliding rod, a sliding groove is provided at the bottom of the slider, the top of the moving block slides in the sliding groove, a spring is provided in the sliding groove, one end of the spring is connected to the top of the moving block, and the other end is connected to the inner wall of the sliding groove.

[0011] Preferably, the circulation component includes a circulation pump and a connecting pipe, both ends of the connecting pipe are connected to the top and bottom of the crushing box respectively, and the circulating pump is provided on the connecting pipe.

[0012] Preferably, the crushing box is provided with a crushing knife and a temperature control component, the filter box is provided with a filter screen, the side wall of the extraction tank is provided with an ultrasonic generator, the centrifugal tank is provided with a membrane separation component, a centrifugal component is provided below the membrane separation component, and the extraction tank and the filter box are respectively provided with sealing doors.

[0013] The present invention also provides a method for extracting natural plant extracts, which is achieved by the above-mentioned device and comprises the following steps:

[0014] Step 1: Place the natural plant to be extracted in a crushing box, add a composite enzyme preparation, add a solvent to the crushing box, crush it with a crushing knife, start the circulation pump to circulate the crushed material at the bottom of the crushing box through a connecting pipe to the top of the crushing box to crush the crushed material again, and repeat this cycle several times to fully crush the natural plant. Start the temperature control component to enzymolyze the natural plant, freeze the enzymolyzed natural plant for 10-30 minutes, and then quickly heat it to room temperature.

[0015] Step 2: transporting the fully crushed natural plant in step 1 into a filter box, separating the filtrate and the natural plant residue through a filter screen, and the separated filtrate enters an extraction tank. Opening the sealed door of the filter box, taking out the natural plant residue on the filter screen, and placing the natural plant residue into a raw material storage box in the extraction tank. The raw material storage box is placed in a placement ring, and the top cover is covered with a compression spring to seal the extraction tank.

[0016] Step 3: Add the first stage polar solvent extractant into the extraction tank, turn on the ultrasonic generator, set the operating frequency and power, extract at normal pressure for 20-30 minutes, add the second stage polar solvent extractant, increase the operating frequency and power of the ultrasonic generator, pressurize to 0.1-0.5 MPa, and extract for 40-80 minutes;

[0017] In step 4, the extract obtained in step 3 is transported to a centrifuge tank and initially filtered through a membrane separation component. The filtered retentate enters a centrifuge component for centrifugal purification to obtain a natural plant extract.

[0018] Preferably, in step 3, during the extraction process, the motor is started, the motor drives the second bevel gear to rotate, thereby driving the first bevel gear to rotate, causing the gear to rotate, and the telescopic rod is extended and retracted to drive the raw material storage box to move, and moves until the gear ring engages with the gear, driving the raw material storage box to rotate, making the extraction more uniform, and by controlling the movement frequency of the telescopic rod, the rotation degree of the raw material storage box is controlled.

[0019] The advantages and beneficial effects of the present invention using the above-mentioned extraction method and device for natural plant extracts are:

[0020] 1. The present invention destroys the plant cell structure through pulverization and combines segmented gradient extraction to adapt to the dissolution rules of components with different polarities, thereby improving the total extraction rate compared with traditional ultrasonic extraction and improving the extraction rate of individual components.

[0021] 2. The present invention utilizes gradient adjustment of solvent polarity, ultrasonic parameters and temperature and pressure conditions to achieve directional extraction of multi-component active ingredients, improve the purity of the extract and reduce the impurity content.

[0022] 3. The present invention can be adapted to different types of natural plant raw materials and can achieve efficient extraction of a variety of effective ingredients by adjusting process parameters, thus having a wide range of applications.

[0023] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the extraction device of the natural plant extract of the present invention;

[0025] Figure 2 This is a schematic diagram of the internal structure of the extraction device for natural plant extracts of the present invention;

[0026] Figure 3 yes Figure 2 A in the middle is an enlarged schematic diagram;

[0027] Figure 4 yes Figure 2 The enlarged schematic diagram of point B in the middle;

[0028] Figure 5 This is a schematic diagram of a raw material storage box in the extraction device for natural plant extracts of the present invention;

[0029] Figure 6 It is a schematic diagram of the placement ring in the extraction device of the natural plant extract of the present invention.

[0030] Reference numerals

[0031] 1. Filter box; 2. Crushing box; 3. Connecting pipe; 4. Circulation pump; 5. Extraction tank; 6. Centrifuge tank; 7. Filter screen; 8. Top cover; 9. Telescopic rod; 10. Placement ring; 11. Raw material storage box; 12. Crushing knife; 13. Slide bar; 14. Motor; 15. Card slot; 16. Membrane separation component; 17. Centrifugal component; 18. Moving block; 19. Spring; 20. Slider; 21. Slide slot; 22. First bevel gear; 23. Second bevel gear; 24. Gear; 25. Gear ring; 26. Connecting shaft; 27. Annular card block. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0033] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0034] Example 1

[0035] like Figure 1 and Figure 2 As shown, an extraction device for natural plant extracts includes a crushing box 2, a filter box 1, an extraction tank 5, and a centrifugal tank 6. The crushing box 2 is connected to the filter box 1, the filter box 1 is connected to the extraction tank 5, and the extraction tank 5 is connected to the centrifugal tank 6. The crushing box 2, the filter box 1, the extraction tank 5, and the centrifugal tank 6 are respectively provided with inlets and outlets. A crushing knife 12 and a temperature control component (not shown in the figure) are provided in the crushing box 2, a filter screen 7 is provided in the filter box 1, an ultrasonic generator (not shown in the figure) is provided on the side wall of the extraction tank 5, a membrane separation component 16 is provided in the centrifugal tank 6, and a centrifugal component 17 is provided below the membrane separation component 16. The extraction tank 5 and the filter box 1 are respectively provided with sealed doors. The crushing knife 12, the temperature control component, the ultrasonic generator, the filter screen 7, the membrane separation component 16, and the centrifugal component 17 are all made of existing technologies and are selected according to the actual extraction situation.

[0036] A circulation assembly is provided on the outside of the crushing box 2, which includes a circulation pump 4 and a connecting pipe 3. The two ends of the connecting pipe 3 are respectively connected to the top and bottom of the crushing box 2. The circulating pump 4 is provided on the connecting pipe 3. The natural plant to be extracted is placed in the crushing box 2, a solvent is added to the crushing box 2, and the crushing is performed by the crushing blade 12. The circulation pump 4 is started to circulate the crushed material at the bottom of the crushing box 2 through the connecting pipe 3 to the top of the crushing box 2 for further crushing. This cycle is repeated multiple times to fully crush the natural plant, which is conducive to the dissolution of the extract.

[0037] The extraction tank 5 is provided with a raw material storage box 11. After the natural plants are fully crushed in the crushing tank, the natural plant residue is filtered through the filter screen and placed in the raw material storage box 11 in the extraction tank 5. The outer wall of the raw material storage box 11 is provided with mesh holes (such as Figure 5 As shown), it is convenient for the extract to contact the natural plant residue in the raw material storage box 11. The top of the raw material storage box 11 is provided with a top cover 8, and a movable block 18 is provided above the top cover 8. Figure 3 As shown, the top of the extraction tank 5 is provided with a slide bar 13, on which a slider 20 is mounted. Slidingly connected to the slide bar 13, a chute 21 is provided at the bottom of the chute 20, within which the top of the movable block 18 slides. A spring 19 is provided within the chute 21, with one end of the spring 19 connected to the top of the movable block 18 and the other end connected to the inner wall of the chute 21. When the top cover 8 is closed on the raw material storage box 11, the spring 19 is always in a compressed state, thereby holding the top cover 8 in place.

[0038] The inner walls of the extraction tank 5 are provided with telescopic rods 9, which are electric telescopic rods 9. A placement ring 10 (such as Figure 6 As shown, the raw material storage box 11 is engaged within the placement ring 10 and in rotational contact with the placement ring 10. The telescopic end of the telescopic rod 9 is connected to the outer wall of the placement ring 10. An annular clamping block 27 is circumferentially provided on the outer wall of the raw material storage box 11. The placement ring 10 is provided with a slot 15 corresponding to the annular clamping block 27, and the annular clamping block 27 is engaged within the slot 15. The telescopic rods 9 on both sides of the wall cooperate with each other to move the raw material storage box 11 back and forth. During this movement, the slider 20 slides on the slide rod 13. This facilitates full contact between the natural plant raw materials in the raw material storage box 11 and the extractant, improving extraction efficiency.

[0039] A gear ring 25 is provided on the outer wall of the raw material storage box 11 along the circumferential direction, and gears 24 meshing with the gear ring 25 are provided on the inner wall surfaces on both sides of the extraction tank 5. Figure 4As shown, a connecting shaft 26 is provided above the gear 24, and a first bevel gear 22 is sleeved on the outer side of the connecting shaft 26. A motor 14 is provided on the outer wall of the extraction tank 5. The output end of the motor 14 extends through the side wall of the extraction tank 5 and is provided with a second bevel gear 23 that meshes with the first bevel gear 22. When the motor 14 is started, the motor 14 drives the second bevel gear 23 to rotate, thereby driving the first bevel gear 22 to rotate, and thus driving the gear 24 to rotate. The telescopic rod 9 is extended and retracted, driving the raw material storage box 11 to move. When the gear ring 25 meshes with the gear 24, the telescopic rod 9 stops extending and retracting, and the gear 24 rotates, driving the raw material storage box 11 to rotate, making the extraction more uniform and efficient. By controlling the frequency of the telescopic movement interval of the telescopic rod 9, the degree of rotation of the raw material storage box 11 is controlled.

[0040] Example 2

[0041] A method for extracting a natural plant extract comprises the following steps:

[0042] Step 1: Place the natural plant to be extracted in a crushing box, add a compound enzyme preparation, add a solvent to the crushing box, crush it with a crushing knife, start the circulation pump to circulate the crushed material at the bottom of the crushing box through a connecting pipe to the top of the crushing box to crush the crushed material again, and repeat this process for multiple cycles to fully crush the natural plant. Start the temperature control component to enzymolyze the natural plant, freeze the enzymolyzed natural plant for 10-30 minutes, and then quickly warm it to room temperature. According to the characteristics of the plant raw material, a compound enzyme preparation is selected to enzymolyze the crushed plant raw material. The cellulose and pectin structure of the plant cell wall is destroyed by enzymolysis, thereby promoting the formation of an effective ingredient release channel. The ice crystal expansion effect caused by the sudden temperature change is used to further break the cells and improve the mass transfer efficiency of subsequent extraction.

[0043] Step 2: transport the fully crushed natural plants in step 1 into the filter box, separate the filtrate and the natural plant residue through the filter screen, and the separated filtrate enters the extraction tank. Open the sealed door of the filter box to take out the natural plant residue on the filter screen, and put the natural plant residue into the raw material storage box in the extraction tank. Place the raw material storage box in the placement ring, compress the spring cover to cover the top cover, and seal the extraction tank.

[0044] Step 3: Add the first-stage polar solvent extractant to the extraction tank, turn on the ultrasonic generator, set the operating frequency and power, extract at normal pressure for 20-30 minutes, add the second-stage medium-polar solvent extractant, increase the operating frequency and power of the ultrasonic generator, pressurize to 0.1-0.3MPa, and extract for 40-80 minutes. Segmented gradient extraction adapts to the dissolution rules of components of different polarity, thereby improving the total extraction rate compared to traditional ultrasonic extraction. By using gradients to adjust solvent polarity, ultrasonic parameters, and temperature and pressure conditions, directional extraction of multi-component active ingredients is achieved, the purity of the extract is improved, and the impurity content is reduced.

[0045] In step 4, the extract obtained in step 3 is transported to a centrifuge tank and initially filtered through a membrane separation component. The filtered retentate enters a centrifuge component for centrifugal purification to obtain a natural plant extract.

[0046] In step 3, during the extraction process, the motor 14 is started, and the motor 14 drives the second bevel gear 23 to rotate, thereby driving the first bevel gear 22 to rotate, thereby driving the gear 24 to rotate, and the telescopic rod 9 is extended and retracted to drive the raw material storage box 11 to move, and moves until the gear ring 25 engages with the gear 24. The telescopic rod 9 stops extending and retracting, and the gear 24 rotates to drive the raw material storage box 11 to rotate, making the extraction more uniform and efficient. By controlling the interval frequency of the telescopic movement of the telescopic rod 9, the rotation degree of the raw material storage box 11 is controlled.

[0047] Example 3

[0048] The synergistic extraction of chlorogenic acid and luteolin from honeysuckle comprises the following steps:

[0049] Step 1: Place 1 kg of honeysuckle in a crushing box, add 0.01 kg of complex enzyme preparation (cellulase: pectinase mass ratio of 1:1), add water into the crushing box, the solid-liquid ratio is 1:10, crush with a crushing knife, start the circulation pump to circulate the crushed material at the bottom of the crushing box through the connecting pipe to the top of the crushing box to crush the crushed material again, and repeat this cycle several times to fully crush the honeysuckle, adjust the pH to 5.0 with citric acid buffer, start the temperature control component, enzymolyze the honeysuckle at a constant temperature of 40°C for 60 minutes, freeze the enzymolyzed honeysuckle at -10°C for 30 minutes, and then quickly heat it to room temperature to complete the wall breaking.

[0050] Step 2: transport the honeysuckle wall-breaking liquid that is fully crushed in step 1 into the filter box, separate the filtrate and the honeysuckle residue through the filter screen, and the separated filtrate enters the extraction tank. Open the sealed door of the filter box to take out the honeysuckle residue on the filter screen, and put the honeysuckle residue into the raw material storage box in the extraction tank. Place the raw material storage box in the placement ring, compress the spring, cover the top cover, and seal the extraction tank.

[0051] Step 3. Add 70% ethanol aqueous solution (solid-liquid ratio 1:12) into the extraction tank, turn on the ultrasonic generator, ultrasonic frequency 30 kHz, power 400 W, 40 ° C, normal pressure extraction 30 min, extract chlorogenic acid (polar component), add the second stage medium polar solvent extractant, add 50% ethanol aqueous solution to the solid-liquid ratio of 1:15, ultrasonic frequency 50 kHz, power 600 W, 60 ° C, 0.2 MPa extraction 45 min, extract luteolin (medium polar component).

[0052] During the extraction process, the motor 14 is started, and the motor 14 drives the second bevel gear 23 to rotate, thereby driving the first bevel gear 22 to rotate, thereby driving the gear 24 to rotate, and the telescopic rod 9 is extended and retracted to drive the raw material storage box 11 to move, and moves until the gear ring 25 engages with the gear 24. The telescopic rod 9 stops extending and retracting, and the gear 24 rotates to drive the raw material storage box 11 to rotate, making the extraction more uniform and efficient. By controlling the interval frequency of the telescopic movement of the telescopic rod 9, the rotation degree of the raw material storage box 11 is controlled.

[0053] In step 4, the extract from step 3 was transferred to a centrifuge tank and separated through a 1000Da membrane. The membrane separation assembly performed preliminary filtration. The filtered retentate was centrifuged at 10,000 rpm for 20 minutes. The supernatant was applied to an AB-8 macroporous resin column (flow rate 1.5 BV / h). The column was rinsed with 3 BV of water, and then eluted with 30% ethanol to remove chlorogenic acid and 50% ethanol to remove luteolin. This yielded a natural plant extract containing chlorogenic acid crystals (92.3% purity) and luteolin powder (89.7% purity), with a total extraction yield of 88.6%.

[0054] Example 4

[0055] The extraction of baicalin and wogonin from Scutellaria baicalensis comprises the following steps:

[0056] Step 1: Place 1 kg of astragalus in a crushing box, add 0.008 kg of complex enzyme preparation, add water to the crushing box, with a solid-liquid ratio of 1:8, crush with a crushing knife, start the circulation pump to circulate the crushed material at the bottom of the crushing box through the connecting pipe to the top of the crushing box to crush the crushed material again, and repeat this cycle several times to fully crush the astragalus. Adjust the pH to 5.5 with citric acid buffer, start the temperature control component, and enzymolyze the astragalus at a constant temperature of 45°C for 45 minutes. Freeze the enzymolyzed astragalus at -15°C for 25 minutes, and then quickly heat it to room temperature to complete the wall breaking.

[0057] Step 2: The astragalus wall-breaking liquid that is fully crushed in step 1 is transported to a filter box, the filtrate and the astragalus residue are separated by a filter screen, the separated filtrate enters an extraction tank, the sealed door of the filter box is opened to take out the astragalus residue on the filter screen, the astragalus residue is placed in a raw material storage box in the extraction tank, the raw material storage box is placed in a placement ring, the spring is compressed, the top cover is covered, and the extraction tank is sealed.

[0058] Step 3: Add 50% ethanol aqueous solution (solid-liquid ratio 1:10) to the extraction tank, turn on the ultrasonic generator, and extract at 20kHz, 350W, 35°C, and normal pressure for 25 minutes (to obtain baicalin, polar). Add 30% ethanol-ethyl acetate mixture (volume ratio 7:3, solid-liquid ratio 1:20), and extract at 70kHz, 800W, 75°C, and 0.4MPa for 50 minutes (wogonin, weak polarity) to extract luteolin (medium polarity component).

[0059] During the extraction process, the motor 14 is started, and the motor 14 drives the second bevel gear 23 to rotate, thereby driving the first bevel gear 22 to rotate, thereby driving the gear 24 to rotate, and the telescopic rod 9 is extended and retracted to drive the raw material storage box 11 to move, and moves until the gear ring 25 engages with the gear 24. The telescopic rod 9 stops extending and retracting, and the gear 24 rotates to drive the raw material storage box 11 to rotate, making the extraction more uniform and efficient. By controlling the interval frequency of the telescopic movement of the telescopic rod 9, the rotation degree of the raw material storage box 11 is controlled.

[0060] Step 4: The extract obtained in step 3 is transferred to a centrifuge tank, separated by a 3000Da membrane, and initially filtered by a membrane separation component. The filtered retentate is centrifuged at 12000r / min for 25min, and the supernatant is adsorbed on a D101 macroporous resin column. Baicalin (purity 91.5%) is eluted with 50% ethanol, and wogonin (purity 88.3%) is eluted with 70% ethanol. The total extraction rate is 86.2%.

[0061] Therefore, the present invention adopts the above-mentioned extraction method and device of natural plant extracts, destroys the plant cell structure through pulverization, and combines segmented gradient extraction to adapt to the dissolution rules of components of different polarity, so that the total extraction rate is improved compared with traditional ultrasonic extraction, and the extraction rate of individual components is improved. By using gradient adjustment of solvent polarity, ultrasonic parameters and temperature and pressure conditions, the directional extraction of multi-component active ingredients is achieved, the purity of the extract is improved, and the impurity content is reduced. It can be adapted to different types of natural plant raw materials, and by adjusting the process parameters, efficient extraction of multiple active ingredients can be achieved, with a wide range of applications.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An extraction device for natural plant extracts, characterized in that: It includes a crushing box, a filtering box, an extraction tank, and a centrifugal tank. A circulation component is provided on the outside of the crushing box. A raw material storage box is provided in the extraction tank. A mesh hole is provided on the outer wall of the raw material storage box. A top cover is provided on the top of the raw material storage box. A movable block with a rotatable connection is provided above the top cover. Telescopic rods are provided on the inner walls of the extraction tank respectively. A placement ring is provided between the telescopic rods on the two side walls. The raw material storage box is clamped in the placement ring and in rotational contact with the placement ring. A gear ring is provided along the circumferential direction of the outer wall of the raw material storage box. Gears meshing with the gear ring are provided on the inner walls on both sides of the extraction tank respectively.

2. The extraction device for natural plant extracts according to claim 1, characterized in that: The telescopic end of the telescopic rod is connected to the outer wall of the placement ring. The outer wall of the raw material storage box is circumferentially provided with an annular clamping block. A clamping groove corresponding to the annular clamping block is provided in the placement ring, and the annular clamping block is clamped in the clamping groove.

3. The extraction device for natural plant extracts according to claim 1, characterized in that: A connecting shaft is provided above the gear, and a first bevel gear is sleeved on the outer side of the connecting shaft. A motor is provided on the outer wall of the extraction tank. The output end of the motor passes through the side wall of the extraction tank and is provided with a second bevel gear meshing with the first bevel gear.

4. The extraction device for natural plant extracts according to claim 1, characterized in that: The crushing box is communicated with the filtering box, the filtering box is communicated with the extraction tank, and the extraction tank is communicated with the centrifugal tank.

5. The extraction device for natural plant extracts according to claim 1, characterized in that: A sliding rod is provided on the top of the extraction tank, a slider is provided on the sliding rod, the slider is slidably connected to the sliding rod, a sliding groove is provided at the bottom of the slider, the top of the moving block slides in the sliding groove, a spring is provided in the sliding groove, one end of the spring is connected to the top of the moving block, and the other end is connected to the inner wall of the sliding groove.

6. The extraction device for natural plant extracts according to claim 1, characterized in that: The circulation component includes a circulation pump and a connecting pipe. The two ends of the connecting pipe are respectively connected to the top and the bottom of the crushing box. The circulating pump is arranged on the connecting pipe.

7. The extraction device for natural plant extracts according to claim 1, characterized in that: The crushing box is provided with a crushing knife and a temperature control component, the filter box is provided with a filter screen, the side wall of the extraction tank is provided with an ultrasonic generator, the centrifugal tank is provided with a membrane separation component, and a centrifugal component is provided below the membrane separation component. The extraction tank and the filter box are respectively provided with sealing doors.

8. A method for extracting natural plant extracts, characterized in that: The method is implemented by the device according to any one of claims 1 to 7, comprising the following steps: Step 1: Place the natural plant to be extracted in a crushing box, add a composite enzyme preparation, add a solvent to the crushing box, crush it with a crushing knife, start the circulation pump to circulate the crushed material at the bottom of the crushing box through a connecting pipe to the top of the crushing box to crush the crushed material again, and repeat this cycle several times to fully crush the natural plant. Start the temperature control component to enzymolyze the natural plant, freeze the enzymolyzed natural plant for 10-30 minutes, and then quickly heat it to room temperature. Step 2: transporting the fully crushed natural plant in step 1 into a filter box, separating the filtrate and the natural plant residue through a filter screen, and the separated filtrate enters an extraction tank. Opening the sealed door of the filter box, taking out the natural plant residue on the filter screen, and placing the natural plant residue into a raw material storage box in the extraction tank. The raw material storage box is placed in a placement ring, and the top cover is covered with a compression spring to seal the extraction tank. Step 3: Add the first stage polar solvent extractant into the extraction tank, turn on the ultrasonic generator, set the operating frequency and power, extract at normal pressure for 20-30 minutes, add the second stage polar solvent extractant, increase the operating frequency and power of the ultrasonic generator, pressurize to 0.1-0.5 MPa, and extract for 40-80 minutes; In step 4, the extract obtained in step 3 is transported to a centrifuge tank and initially filtered through a membrane separation component. The filtered retentate enters a centrifuge component for centrifugal purification to obtain a natural plant extract.

9. The method for extracting a natural plant extract according to claim 8, characterized in that: In step 3, during the extraction process, the motor is started, and the motor drives the second bevel gear to rotate, thereby driving the first bevel gear to rotate, causing the gear to rotate, and the telescopic rod is extended and retracted to drive the raw material storage box to move, and moves until the gear ring engages with the gear, driving the raw material storage box to rotate, making the extraction more uniform. By controlling the movement frequency of the telescopic rod, the rotation degree of the raw material storage box is controlled.

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