A supercritical carbon dioxide extraction device and method for ginger essential oil

Abstract

The present invention relates to the technical field of essential oil extraction, and more particularly to a supercritical carbon dioxide extraction device and method for ginger essential oil. Comprise the following steps: S1 crushing: after cleaning the material, drying and crushing, the particle size after crushing is 40-60 mesh, and material powder is obtained; S2 infiltration: ginger powder and porous nano-scale silica accounting for 3% of the weight of ginger powder are placed in a paper tube, and the ginger powder is completely immersed in ethanol at a temperature of 25-30 ° C, and infiltrated for 20-30 minutes; S3 supercritical carbon dioxide extraction: the material powder after step S2 treatment is mixed with ethanol, and after mixing, it is introduced into an extraction device, supercritical carbon dioxide fluid is input into the extraction device, supercritical carbon dioxide extraction is performed, and an extract is obtained. The present invention improves the extraction efficiency of the material by infiltrating the material with ethanol, and simultaneously improves the permeability of the material cell membrane with a stabilizer, thereby further improving the extraction efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of essential oil extraction, in particular to a device and method for supercritical carbon dioxide extraction of ginger essential oil. Background Art

[0002] Ginger essential oil is a common essential oil product extracted from the ginger plant. It has a unique aroma and rich bioactive ingredients. It is widely used in food, medicine, spices and other fields. In the medical field, biotechnology means (such as cell experiments and animal models) are used to verify the pharmacological effects of ginger essential oil and promote its clinical application. The preparation process of ginger essential oil mainly includes: raw material preparation, extraction, separation, concentration and storage. The quality of the raw materials directly affects the purity of the prepared ginger essential oil. Ginger varieties can now be improved through biotechnology (such as molecular marker-assisted breeding), thereby increasing the content and quality of essential oils. At the same time, the extraction step is equally important. Most existing extractions use traditional steam distillation. Due to the action of high-temperature steam, some volatile or heat-sensitive components in ginger essential oil will decompose or oxidize, resulting in component loss. The ginger essential oil finally separated by distillation usually contains a certain amount of water, requiring an additional concentration step, which increases the workload. In general, although the steam distillation technology is mature, it has problems such as low extraction efficiency and component loss. Summary of the Invention

[0003] In order to overcome the shortcomings mentioned in the above technical background, the present invention provides a supercritical carbon dioxide extraction device and method for ginger essential oil.

[0004] The technical solution is as follows:

[0005] A supercritical carbon dioxide extraction device for ginger essential oil, comprising: a frame; the frame is fixedly connected to an extraction tank; a fixed ring, fixedly connected to the extraction tank, the fixed ring being provided with a through groove; a separating cylinder, fixedly connected to the fixed ring, the separating cylinder dividing the space in the extraction tank into an inner and outer part, the separating cylinder being provided with a discharge port, and the extraction tank being installed with a motor; a main shaft, rotatably connected to the extraction tank, the main shaft being fixedly connected to the output shaft of the motor, the main shaft being rotatably connected to the separating cylinder, the extraction tank and the separating cylinder being both penetrated by the main shaft; a first spiral plate, fixedly connected to the main shaft, the first spiral plate being in contact with the inner wall of the separating cylinder; a circulation mechanism, arranged in the extraction tank, for circulating the material in the extraction tank; a blocking mechanism, arranged on a side of the separating cylinder close to the discharge port, for providing resistance to the material in the separating cylinder; a filling mechanism, arranged on the extraction tank, for filling the extraction tank with extraction medium.

[0006] In addition, it is particularly preferred that the lower side of the discharge port is an inclined surface, and the height of the discharge port inclined surface on one side close to the central axis of the separation cylinder is greater than the height on the other side, so as to facilitate material discharge.

[0007] In addition, it is particularly preferred that the circulation mechanism includes: a rotating plate, fixedly connected to the side of the main shaft away from the discharge port, and a gap is present between the rotating plate and the inner wall of the extraction tank; a fixed rod, fixedly connected to the rotating plate; a rotating shell, fixedly connected to the side of the main shaft away from the rotating plate, and the rotating shell is rotatably connected to the extraction tank, and the opposite sides of the fixed rod and the rotating shell are fixedly connected with a second spiral plate, the inner wall of the extraction tank, the fixed ring and the outer wall of the separating cylinder are all in contact with the second spiral plate, and the rotation direction of the second spiral plate is opposite to that of the first spiral plate; a gathering plate, fixedly connected to the fixed rod.

[0008] In addition, it is particularly preferred that the gathering plate is an arc-shaped plate, which is used to push the materials in the adjacent areas toward the direction close to the central axis of the main shaft.

[0009] In addition, it is particularly preferred that a blocking ring is fixedly connected to a side of the separation cylinder close to the rotating plate, a side of the blocking ring away from the rotating plate is an inclined surface, and a gap exists between the blocking ring and the inner wall of the extraction tank.

[0010] In addition, it is particularly preferred that the blocking mechanism includes: a blocking block, which is slidably connected to the side of the separation cylinder away from the rotating plate, the blocking block is rotationally connected to the main shaft, and an elastic element is fixedly connected between the blocking block and the separation cylinder; and a cutting plate, which is fixedly connected to the rotating shell, and the cutting plate is in contact with the outer wall of the separation cylinder.

[0011] In addition, it is particularly preferred that the filling mechanism includes: a connecting pipe, fixedly connected to the extraction tank, the connecting pipe is connected to an external injection device, the fixed ring is provided with a first channel and a second channel, the connecting pipe and the second channel are both connected to the first channel, the first channel and the second channel are both installed with spaced solenoid valves, the separating cylinder is penetrated by adjacent solenoid valves, and the solenoid valves on the fixed ring respectively fill the two spaces of the extraction tank with extraction medium.

[0012] In addition, it is particularly preferred that it also includes: a stirring member, fixedly connected to the main shaft, and the stirring member has elastic deformation capability; a limiting rod, fixedly connected to the stirring member, and the separating cylinder is provided with a limiting groove, and the limiting groove is a wavy groove, which is used to limit the limiting rod.

[0013] In addition, it is particularly preferred that the stirring member is located between the first spiral plate and the blocking block, and is used to stir the material in the extruded state.

[0014] According to another aspect of the present invention, a method for supercritical carbon dioxide extraction of ginger essential oil is provided, comprising the following steps:

[0015] S1 Crushing: After cleaning the material, drying and crushing it to a particle size of 40-60 mesh to obtain material powder;

[0016] S2 Infiltration: Place ginger powder and porous nano-silica accounting for 3% of the weight of the ginger powder into a paper tube, and completely immerse the ginger powder in ethanol. The amount of ethanol used is 3-5 times the weight of the ginger powder. The temperature is 25-30°C and the infiltration time is 20-30 minutes.

[0017] S3 supercritical carbon dioxide extraction: the material powder treated in step S2 is mixed with ethanol, and the mixture is introduced into an extraction device, supercritical carbon dioxide fluid is input into the extraction device, and supercritical carbon dioxide extraction is performed to obtain an extract.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects: the present invention improves the extraction efficiency of the material by soaking it with ethanol, and at the same time improves the permeability of the cell membrane of the material by using a stabilizer, thereby further improving the extraction efficiency; the extraction medium is injected into the extraction tank and moves in the opposite direction to the material in the separation cylinder, thereby increasing the contact area between the two and also playing a stirring role, which is conducive to the full mixing between the two, thereby improving the extraction efficiency and extraction quality; the material is blocked by the inclined surface on the blocking ring and is kneaded under the action of the second spiral plate, thereby destroying the relatively stable state between the material and the extraction medium. The two are further mixed, thereby increasing the contact area between the two and improving the extraction efficiency; the cutting plate is used to crush the material discharged from the discharge port, so that the material is repeatedly compacted and broken up during the cyclic extraction process, thereby changing the contact area between the supercritical carbon dioxide and the ginger powder, so that the ginger powder in each area of ​​the extraction tank is fully in contact with the supercritical carbon dioxide, thereby improving the extraction efficiency of the material; the stirring piece whose shape gradually changes during the rotation stirs the (compacted) material in the adjacent area, thereby reducing dead corners and unstirred areas during the stirring process, and at the same time further enlarges the stirring area, thereby improving the stirring effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0020] Figure 2 This is a sectional view of the three-dimensional structure of the frame and the extraction tank of the present invention;

[0021] Figure 3 A sectional view of the three-dimensional structure of the rotating plate and the second spiral plate of the present invention when rotating;

[0022] Figure 4 This is a sectional view of the three-dimensional structure of the extraction tank and the separation cylinder of the present invention;

[0023] Figure 5 This is a sectional view of the three-dimensional structure of the rotating shell and the blocking block of the present invention;

[0024] Figure 6 Schematic diagram of the three-dimensional structure of the second spiral plate and the barrier ring of the present invention;

[0025] Figure 7 This is a sectional view of the three-dimensional structure of the extraction tank and the fixing ring of the present invention;

[0026] Figure 8 It is a three-dimensional structural cross-sectional view of the separation cylinder and the rotating shell of the present invention.

[0027] In the accompanying drawings: 1-frame, 2-extraction tank, 3-fixing ring, 4-separation cylinder, 5-discharge port, 6-motor, 7-main shaft, 8-first spiral plate, 901-rotating plate, 902-fixing rod, 903-rotating shell, 904-second spiral plate, 905-gathering plate, 906-blocking ring, 1001-blocking block, 1002-elastic element, 1003-cutting plate, 1101-connecting pipe, 1102-first channel, 1103-second channel, 1201-stirring member, 1202-limiting rod, 1203-limiting groove. DETAILED DESCRIPTION

[0028] The above scheme is further described below with reference to specific examples. It should be understood that these examples are intended to illustrate the present application and are not intended to limit the scope of the present application. The implementation conditions used in the examples can be further adjusted according to the conditions of the specific manufacturer. The implementation conditions not specified are generally those used in routine experiments.

[0029] A method for extracting ginger essential oil from supercritical carbon dioxide comprises the following steps:

[0030] S1: Grinding: Wash the ginger, dry it, and grind it into a particle size of 40-60 mesh to obtain ginger powder;

[0031] S2 Infiltration: Place ginger powder and porous nano-scale silica accounting for 3% of the weight of the ginger powder into a paper tube, and completely immerse the ginger powder in ethanol. The amount of ethanol used is 3-5 times the weight of the ginger powder. The temperature is 25-30°C and the infiltration time is 20-30 minutes. This is beneficial to the efficiency of subsequent extraction. At the same time, the porous nano-scale silica is used as a stabilizer to improve the permeability of the ginger cell membrane, further improving the extraction efficiency.

[0032] S3 supercritical carbon dioxide extraction: the ginger powder treated in step S2 is mixed with ethanol, and the mixture is introduced into an extraction device, supercritical carbon dioxide fluid is input into the extraction device, and supercritical carbon dioxide extraction is performed to obtain an extract.

[0033] like Figures 1-4 As shown, a supercritical carbon dioxide extraction device for ginger essential oil is used to solve the problem that the existing extraction technology only allows the extraction medium (supercritical carbon dioxide) to flow through the material, resulting in low relative movement speed and insufficient contact between the two, which leads to long extraction time and low efficiency. The device comprises: a frame 1; the frame 1 is fixedly connected to the extraction tank 2; a fixed ring 3, which is fixedly connected to the extraction tank 2 and is provided with a through groove; a separator 4, which is fixedly connected to the fixed ring 3, and the separator 4 divides the space in the extraction tank 2 into an inner and an outer part. The separator 4 is provided with a discharge port 5, the lower side of the discharge port 5 is an inclined surface, and the height of the side of the inclined surface of the discharge port 5 close to the central axis is greater than the height of the other side. In order to facilitate the discharge of materials (taking ginger powder as an example), the extraction tank 2 is equipped with a motor 6; the main shaft 7 is rotatably connected to the extraction tank 2, the main shaft 7 is fixedly connected to the output shaft of the motor 6, the main shaft 7 is rotatably connected to the separation cylinder 4, and the extraction tank 2 and the separation cylinder 4 are both penetrated by the main shaft 7; the first spiral plate 8 is fixedly connected to the main shaft 7, and the first spiral plate 8 is in contact with the inner wall of the separation cylinder 4; the circulation mechanism is arranged in the extraction tank 2, for circulating the material in the extraction tank 2; the blocking mechanism is arranged on the lower side of the separation cylinder 4, for providing resistance to the material in the separation cylinder 4; the filling mechanism is arranged on the lower middle side of the extraction tank 2, for filling the extraction tank 2 with extraction medium (taking supercritical carbon dioxide as an example).

[0034] In the above scheme, a feed pipe and a first discharge pipe are provided on the upper side of the extraction tank 2, a second discharge pipe is provided on the lower part of the left side of the extraction tank 2, and electric control valves are installed in the feed pipe, the first discharge pipe and the second pipe. The through groove on the fixed ring 3 is used to pass the ginger powder. The central axis of the extraction tank 2, the central axis of the fixed ring 3, the central axis of the separating cylinder 4, the central axis of the main shaft 7 and the central axis of the first spiral plate 8 all coincide with each other. The height of the lower side of the first spiral plate 8 is higher than the discharge port 5. When using this device, the output shaft of the motor 6 is used to drive the main shaft 7 to rotate clockwise (such as Figure 4Taking the top view as an example), the main shaft 7 drives the first spiral plate 8 to rotate clockwise, and then the ginger powder is put into the extraction tank 2 through the feeding pipe. After the ginger powder contacts the clockwise rotating spiral plate 8, the ginger powder begins to move downward in the separation cylinder 4 (the inner space in the extraction tank 2) under the action of the spiral plate 8 until the ginger powder is blocked by the blocking mechanism. The spiral plate 8 continues to rotate clockwise to transport the ginger powder downward, so that the ginger powder in the lower part of the separation cylinder 4 is gradually compacted until the squeezed ginger powder passes through the blocking mechanism and is discharged from the discharge port 5 (entering the outer space in the extraction tank 2), and then the ginger powder is automatically discharged by the circulation mechanism. The outer space in the extraction tank 2 is transported upward, and after the ginger powder is transported to and re-enters the separation cylinder 4, the ginger powder is stopped from being added to the extraction tank 2. Then, supercritical carbon dioxide is added to the extraction tank 2 by using the filling mechanism to extract the essential oil in the ginger powder. The supercritical carbon dioxide then carries the ginger essential oil and is discharged from the first discharge pipe on the extraction tank 2 (for subsequent collection and processing). By injecting the supercritical carbon dioxide into the extraction tank 2 and then moving it in the opposite direction to the ginger material in the separation cylinder 4, the contact area between the two is increased, and a stirring effect is also played at the same time, which is conducive to the full mixing between the two, thereby improving the extraction efficiency and extraction quality.

[0035] like Figure 2-Figure 6 As shown, the circulation mechanism includes: a rotating plate 901, which is fixedly connected to the upper side of the main shaft 7, and there is a gap between the rotating plate 901 and the inner wall of the extraction tank 2; a fixed rod 902, which is fixedly connected to the rotating plate 901; a rotating shell 903, which is fixedly connected to the lower side of the main shaft 7, and the rotating shell 903 is rotatably connected to the extraction tank 2, and the opposite sides of the fixed rod 902 and the rotating shell 903 are fixedly connected with a second spiral plate 904, and the inner wall of the extraction tank 2, the outer wall of the fixed ring 3 and the separating cylinder 4 are all in contact with the second spiral plate 904, and the rotation direction of the second spiral plate 904 is opposite to that of the first spiral plate 8; a gathering plate 905, which is fixedly connected to the fixed rod 902, and the gathering plate 905 is an arc-shaped plate, which is used to push the materials in the adjacent areas toward the direction close to the central axis of the main shaft 7, and the separating cylinder 4 is fixedly connected to a blocking ring 906 on the side close to the rotating plate 901, and the lower side of the blocking ring 906 is an inclined surface, and there is a gap between the blocking ring 906 and the inner wall of the extraction tank 2.

[0036] In the above scheme, the central axis of the extraction tank 2, the central axis of the rotating plate 901, the central axis of the rotating shell 903, the central axis of the second spiral plate 904 and the central axis of the blocking ring 906 all coincide with each other. The rotating plate 901 is provided with evenly arranged feeding holes for the ginger powder and supercritical carbon dioxide to pass through. The gathering plate 905 is bent in a clockwise direction from one side close to the central axis of the extraction tank 2 to the other side (taking the top view of the motor 6 as an example). The height of the inclined surface of the lower side of the blocking ring 906 gradually decreases from the outside to the inside. During the clockwise rotation of the main shaft 7, the main shaft 7 drives the rotating plate 901 and the rotating shell 903 to rotate clockwise together. The rotating plate 901 drives the gathering plate 905 to rotate clockwise together through the fixed rod 902. The fixed rod 902 (rotating shell 903) drives the second spiral plate 904 to rotate clockwise together. The second spiral plate 904 transports the ginger powder discharged from the discharge port 5 upward. When the ginger powder passes through the fixed ring 3 During the process, the ginger powder contacts and mixes with the supercritical carbon dioxide emitted from the adjacent solenoid valve on the fixed ring 3, and then the ginger powder moves upward under the action of the second spiral plate 904 (the supercritical carbon dioxide continues to move upward during the process and extracts the essential oil in the ginger powder). After the ginger powder moves upward and contacts the inclined surface on the lower side of the blocking ring 906, the ginger powder begins to be squeezed and guided to move along the inclined surface on the lower side of the blocking ring 906. During the process, the ginger powder is kneaded due to the continuous rotation of the second spiral plate 904, thereby destroying the relatively stable state between the ginger powder and the supercritical carbon dioxide, causing the two to further mix, thereby increasing the contact area between the two and improving the extraction efficiency. After the ginger powder moves upward and passes through the blocking ring 906, the ginger powder is acted upon by the rotating gathering plate 905 and begins to move inward until the ginger powder is again captured by the spiral plate 8 and moves downward in the separation cylinder 4. This cycle is repeated until the extraction is completed.

[0037] like Figure 4-Figure 7 As shown, the blocking mechanism includes: a blocking block 1001, which is slidably connected to the side of the separation cylinder 4 away from the rotating plate 901, the blocking block 1001 is rotationally connected to the main shaft 7, and an elastic element 1002 is fixedly connected between the blocking block 1001 and the separation cylinder 4; a cutting plate 1003, which is fixedly connected to the rotating shell 903, and the cutting plate 1003 is in contact with the outer wall of the separation cylinder 4, and the filling mechanism includes: a connecting pipe 1101, which is fixedly connected to the extraction tank 2, the connecting pipe 1101 is connected to the external injection equipment, the fixed ring 3 is provided with a first channel 1102 and a second channel 1103, the connecting pipe 1101 and the second channel 1103 are both connected to the first channel 1102, the first channel 1102 and the second channel 1103 are both installed with spaced solenoid valves, the separation cylinder 4 is penetrated by adjacent solenoid valves, and the solenoid valves on the fixed ring 3 respectively fill the two spaces of the extraction tank 2 with extraction medium.

[0038] In the above scheme, the upper side of the blocking block 1001 is an inclined surface, and the height of the middle part of the inclined surface is higher than the height of the outer side, which is convenient for the discharge of ginger powder. The blocking block 1001 initially blocks the discharge port 5. The elastic element 1002 is a spring for providing elastic force to the blocking block 1001. The cutting plate 1003 initially covers the adjacent area of ​​the discharge port 5. The length of the cutting plate 1003 in the vertical direction is greater than the maximum length of the discharge port 5 in the vertical direction. The cutting plate 1003 is provided with evenly arranged meshes for "crushing" the compacted ginger powder. In the process of the ginger powder moving downward in the separation cylinder 4, when the ginger powder contacts the blocking block 1001, as the spiral plate 8 Continuing to rotate clockwise, the ginger powder begins to squeeze the blocking block 1001, and the pressure blocking block 1001 begins to slide downward along the separation cylinder 4. The elastic element 1002 is compressed. As the deformation of the elastic element 1002 gradually increases, the ginger powder (between the spiral plate 8 and the pressure blocking block 1001) is gradually compacted, that is, the permeability of the (compacted) ginger powder is reduced, thereby restricting the movement direction of the supercritical carbon dioxide, so that the supercritical carbon dioxide entering the separation cylinder 4 can only move upward, thereby causing the supercritical carbon dioxide and the ginger powder to move in opposite directions. As the pressure blocking block 1001 continues to move downward, when the pressure blocking block 1001 loses its blockage on the discharge port 5, the ginger powder is discharged from the discharge port 5.

[0039] During the clockwise rotation of the rotating shell 903, the rotating shell 903 drives the cutting plate 1003 to rotate clockwise together. During the discharge of the ginger powder from the discharge port 5, the ginger powder is intercepted and cut by the continuously rotating cutting plate 1003. The ginger powder is cut into "granules" in the process of passing through the mesh on the cutting plate 1003. The state of the ginger powder is changed (compacted) in this way, so that the ginger powder is repeatedly compacted and broken up during the cyclic extraction process, thereby changing the contact area between the supercritical carbon dioxide and the ginger powder, so that the ginger powder in each area of ​​the extraction tank 2 is fully in contact with the supercritical carbon dioxide, thereby improving the extraction efficiency of the ginger essential oil.

[0040] Use external injection equipment to inject supercritical carbon dioxide into the first channel 1102 through the connecting pipe 1101, and the supercritical carbon dioxide enters the second channel 1103. Then the supercritical carbon dioxide enters the two spaces in the extraction tank 2 through adjacent solenoid valves, and then the supercritical carbon dioxide begins to extract the ginger essential oil.

[0041] like Figure 4-Figure 8As shown, it also includes: a stirring member 1201, which is fixedly connected to the main shaft 7, and the stirring member 1201 has elastic deformation ability. The stirring member 1201 is located between the first spiral plate 8 and the blocking block 1001, and is used to stir the material in the extruded state; a limiting rod 1202, which is fixedly connected to the stirring member 1201, and the separating cylinder 4 is provided with a limiting groove 1203, and the limiting groove 1203 is a wavy groove, which is used to limit the limiting rod 1202.

[0042] In the above scheme, the stirring member 1201 is made of spring steel. During the clockwise rotation of the main shaft 7, the main shaft 7 drives the stirring member 1201 to rotate clockwise together, and the stirring member 1201 begins to stir the ginger powder in the adjacent area. Since the ginger powder is in a compacted state at this time, the gaps inside the material are smaller and the structure is denser, which reduces dead corners and unstirred areas. At the same time, in the compacted state, the internal friction between the particles is greater, which is conducive to local position exchange inside the ginger powder, improves the stirring and mixing effect, and thus improves the extraction efficiency.

[0043] During the clockwise rotation of the stirring member 1201, the stirring member 1201 drives the limiting rod 1202 to rotate clockwise together, and the limiting rod 1202 begins to slide in the limiting groove 1203. The limiting rod 1202 begins to move cyclically toward and away from the main shaft 7 under the limiting effect of the limiting groove 1203. During the process, the limiting rod 1202 causes the stirring member 1201 to deform, thereby increasing the stirring area, and at the same time enables the stirring member 1201 to stir the ginger powder at different angles, further improving the stirring effect.

[0044] The above description is merely an example of the present invention and is not intended to limit the present invention. Any equivalent substitutions made within the principles of the present invention are intended to be included within the scope of protection of the present invention. Any content not elaborated in detail herein is already known to those skilled in the art.

Claims

1. A supercritical carbon dioxide extraction device for ginger essential oil, characterized in that, Includes: Frame (1); The frame (1) is fixedly connected to an extraction tank (2); A fixed ring (3) is fixedly connected to the extraction tank (2), and the fixed ring (3) is provided with a through groove; A separation cylinder (4) is fixedly connected to the fixing ring (3), the separation cylinder (4) divides the space in the extraction tank (2) into two parts, an inner part and an outer part, the separation cylinder (4) is provided with a discharge port (5), and the extraction tank (2) is equipped with a motor (6); A main shaft (7) is rotatably connected to the extraction tank (2), the main shaft (7) is fixedly connected to the output shaft of the motor (6), the main shaft (7) is rotatably connected to the separation cylinder (4), and the extraction tank (2) and the separation cylinder (4) are both penetrated by the main shaft (7); a first spiral plate (8) fixedly connected to the main shaft (7), the first spiral plate (8) being in contact with the inner wall of the separation cylinder (4); A circulation mechanism is provided in the extraction tank (2) and is used to circulate the material in the extraction tank (2); a blocking mechanism, arranged on a side of the separation cylinder (4) close to the discharge port (5), for providing resistance to the material in the separation cylinder (4); A filling mechanism, provided on the extraction tank (2), for filling the extraction tank (2) with an extraction medium; The circulation mechanism includes: A rotating plate (901) is fixedly connected to a side of the main shaft (7) away from the discharge port (5), and a gap exists between the rotating plate (901) and the inner wall of the extraction tank (2); A fixed rod (902) fixedly connected to the rotating plate (901); A rotating shell (903) is fixedly connected to a side of the main shaft (7) away from the rotating plate (901), the rotating shell (903) is rotatably connected to the extraction tank (2), the fixed rod (902) and the opposite side of the rotating shell (903) are fixedly connected to a second spiral plate (904), the inner wall of the extraction tank (2), the fixed ring (3) and the outer wall of the separation cylinder (4) are all in contact with the second spiral plate (904), and the rotation direction of the second spiral plate (904) is opposite to that of the first spiral plate (8); A gathering plate (905) fixedly connected to the fixing rod (902); A blocking ring (906) is fixedly connected to a side of the separation cylinder (4) close to the rotating plate (901); a side of the blocking ring (906) away from the rotating plate (901) is an inclined surface, and a gap exists between the blocking ring (906) and the inner wall of the extraction tank (2); The blocking mechanism includes: a blocking block (1001) slidably connected to a side of the separation cylinder (4) away from the rotating plate (901), the blocking block (1001) being rotationally connected to the main shaft (7), and an elastic element (1002) being fixedly connected between the blocking block (1001) and the separation cylinder (4); A cutting plate (1003) is fixedly connected to the rotating shell (903), and the cutting plate (1003) is in contact with the outer wall of the separation cylinder (4); The filling mechanism includes: A connecting pipe (1101) is fixedly connected to the extraction tank (2), and the connecting pipe (1101) is connected to an external injection device. The fixing ring (3) is provided with a first channel (1102) and a second channel (1103). The connecting pipe (1101) and the second channel (1103) are both communicated with the first channel (1102). The first channel (1102) and the second channel (1103) are both installed with electromagnetic valves arranged at intervals. The separating cylinder (4) is penetrated by adjacent electromagnetic valves. The electromagnetic valves on the fixing ring (3) respectively fill the two spaces of the extraction tank (2) with extraction medium.

2. A ginger essential oil supercritical carbon dioxide extraction device according to claim 1, characterized in that: The lower side of the discharge port (5) is an inclined surface, and the height of the inclined surface of the discharge port (5) on one side close to the central axis of the separation cylinder (4) is greater than that on the other side, thereby facilitating material discharge.

3. A ginger essential oil supercritical carbon dioxide extraction device according to claim 1, characterized in that: The gathering plate (905) is an arc-shaped plate used to push materials in adjacent areas toward the central axis of the main shaft (7).

4. A ginger essential oil supercritical carbon dioxide extraction device according to claim 1, characterized in that: Also included are: A stirring member (1201) is fixedly connected to the main shaft (7), and the stirring member (1201) has elastic deformation capability; The limiting rod (1202) is fixedly connected to the stirring member (1201), and the separation cylinder (4) is provided with a limiting groove (1203), wherein the limiting groove (1203) is a wave-shaped groove and is used to limit the limiting rod (1202).

5. A supercritical carbon dioxide extraction device for ginger essential oil according to claim 4, characterized in that: The stirring member (1201) is located between the first spiral plate (8) and the blocking block (1001) and is used to stir the material in an extruded state.

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