Grapefruit essential oil extraction device and method and application

Abstract

The invention discloses a grapefruit essential oil extraction device and method and application, and belongs to the technical field of grapefruit essential oil extraction. The grapefruit essential oil extraction device comprises a supporting seat, an oil outlet and a discharging port are formed in the bottom, and a feeding port is formed in the top; the lower grinding disc is arranged to be in a concave disc shape, is coaxial with the supporting seat, is rotationally connected with the supporting seat and can rotate around the supporting seat in a self-driven manner; spines capable of puncturing pomelo peel cells are uniformly arranged on the inclined inner wall, oil leakage holes penetrating through the bottom of the inclined inner wall are formed, and pomelo essential oil can flow into the oil outlet from the oil leakage holes to be discharged; the spikes and the oil leakage holes are distributed in a staggered mode. The upper millstone is arranged opposite to the lower millstone, the bottom of the upper millstone is arranged to be in a convex shape matched with the lower millstone, and the upper millstone is rotationally connected with the supporting seat and eccentrically arranged with the lower millstone; the self-driving rotation direction is opposite to the rotation direction of the lower grinding disc; the air duct is hermetically mounted between the supporting seat and the lower millstone and is positioned at the farthest position between the top surface of the lower millstone and the bottom surface of the upper millstone; the extraction rate of the grapefruit essential oil can be greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of grapefruit essential oil extraction, and in particular to a grapefruit essential oil extraction device, method and application. Background Art

[0002] Grapefruit is a typical citrus fruit, and its peel (accounting for about 40% of the fresh weight of grapefruit) is rich in aromatic oils. Grapefruit aromatic oils are mainly present in the outer peel (i.e., the oil cell layer); the current extraction methods of grapefruit peel essential oil mainly include cold grinding, water distillation, simultaneous distillation extraction, solvent-assisted extraction, and supercritical carbon dioxide; among them, the essential oil prepared by the cold grinding method has the strongest odor favorability, mainly with fresh fragrance, fruity fragrance, and grapefruit fragrance, which is closest to the fragrance of the original grapefruit peel; however, when the existing cold grinding equipment is used to extract grapefruit essential oil, the peel cells are pierced by the sharp thorns on the grinding disc, and then the essential oil flows out of the peel cells, and the peel residue cannot be completely ground, which will cause the grapefruit peel residue to accumulate in the cold grinding equipment. After the new grapefruit peel enters the cold grinding equipment, the grapefruit peel residue will hinder the grinding of the new grapefruit peel, which will reduce the extraction rate of grapefruit essential oil, and when cleaning the grapefruit peel residue, it is easy to clean up the grapefruit peel that has not been completely ground, which will further reduce the extraction rate of grapefruit essential oil.

[0003] Based on this, the present invention designs a grapefruit essential oil extraction device, method and application to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a grapefruit essential oil extraction device, method and application to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a grapefruit essential oil extraction device, comprising a support seat, an oil outlet and a material outlet are provided at the bottom, and a material feed port is provided at the top; a lower grinding disc is arranged in a concave disc shape, is coaxially arranged with the support seat, is rotatably connected with the support seat, and can self-drive to rotate around the support seat; spikes that can pierce grapefruit peel cells are evenly arranged on the inclined inner wall, and an oil leakage hole is provided through the bottom thereof, and grapefruit essential oil can flow into the oil outlet from the oil leakage hole and be discharged; the spikes and the oil leakage hole are staggered; an upper grinding disc is opposite to the lower grinding disc, The bottom is arranged in a convex shape matching the lower grinding disc, is rotatably connected to the support seat and is eccentrically arranged with the lower grinding disc; its self-driven rotation direction is opposite to the rotation direction of the lower grinding disc; the air duct is sealed and installed between the support seat and the lower grinding disc, and is located at the farthest position between the top surface of the lower grinding disc and the bottom surface of the upper grinding disc; the wind blown out of the air duct can be blown into the top of the lower grinding disc through the oil leakage hole located above it, so that the residue on the top of the lower grinding disc moves to the side of the discharge port, so that the new material in the feed port enters the grinding area between the upper and lower grinding discs, and accelerates the discharge of the ground grapefruit essential oil from the oil leakage hole.

[0006] As a further solution of the present invention, the inclination angle of the top surface of the lower grinding disc is smaller than the inclination angle of the bottom surface of the upper grinding disc.

[0007] As a further solution of the present invention, the air duct includes an air duct plate, which is fixed to the support seat, has an open top and the top surface is in contact with the bottom surface of the lower grinding disc; an air inlet pipe, the top of which passes through the bottom of the air duct plate and is connected to the inner cavity of the air duct plate; and a blower connected to the air inlet pipe.

[0008] As a further solution of the present invention, the support seat includes a frame, which is used to support the lower grinding disc and is equipped with a bearing, the inner ring of the bearing is fixedly connected to the lower grinding disc, and the oil outlet and the material outlet are both opened at the bottom of the frame; a cover plate, which is fixedly connected to the frame and used to support the upper grinding disc, and the material feed port is opened at the top of the frame close to the air duct; and a support leg, which is used to support and fix the frame.

[0009] As a further solution of the present invention, the frame and the cover plate are fixed by bolts and nuts.

[0010] As a further solution of the present invention, a gear ring is fixedly connected to the outer circumferential side wall of the lower grinding disc, the gear ring is meshed with a first gear, the first gear is transmission-connected to a first motor, and the first motor is mounted on the side wall of the frame.

[0011] As a further solution of the present invention, a first bevel gear is fixedly connected to the rotating shaft of the upper grinding disc, the first bevel gear is meshed with a second bevel gear, the second bevel gear is transmission-connected to a second motor, and the second motor is installed on the top of the cover plate.

[0012] A method for extracting grapefruit essential oil, the method comprising the following steps: Step 1: Select fresh grapefruits that are free of pests and diseases and are not moldy as raw materials; peel the grapefruit skin, remove the white spongy part and the pulp, and keep the yellow skin part as the raw material for extracting grapefruit peel essential oil; Step 2: Wash the surface impurities and dirt of the grapefruit peel, soak the grapefruit peel in 0.5% sodium carbonate (Na2CO3) solution for 1 to 3 minutes to further remove the residue and impurities on the surface, and then rinse with clean water and drain; Step 3: Add the washed and drained grapefruit peel into the extraction device from the feed port. The rotation of the lower grinding disc drives the grapefruit peel to rotate continuously. The rotation of the upper grinding disc cooperates with the sharp thorns on the lower grinding disc to scratch the peel cells. The flowing grapefruit essential oil will flow out from the oil outlet and be collected; Step 4: After the ground grapefruit peel is rotated above the air duct, the wind blown in by the air duct will push the grapefruit peel downward along the inner wall of the lower grinding disc until the grapefruit peel residue falls from the discharge port; Step 5: After the extraction device is completed, clean and maintain the support seat, lower grinding disc and upper grinding disc.

[0013] The invention discloses an application of a grapefruit essential oil extraction device, which is used for preparing grapefruit essential oil containing d-limonene (61.7%-73.4%), β-myrcene (16.4%-28.2%), β-pinene (0.3%-1.5%), germacrene (0.3%-1.4%), proto-grapeone (0.1%-1.3%), α-pinene (0.1%-0.4%), linalool (0.2%-0.3%) and aurantol (1.6%-1.9%) in components and concentrations.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention arranges the support seat, the lower grinding disc, the upper grinding disc and the air duct, and the lower grinding disc and the upper grinding disc are eccentrically arranged, so that the right gap of the cavity between the lower grinding disc and the upper grinding disc is larger than the left gap, and the grapefruit peel can be fed from the side with the larger gap; then the lower grinding disc can drive the grapefruit peel to rotate from the side with the larger gap to the side with the smaller gap, during which the grapefruit peel can be gradually squeezed, and the essential oil in the grapefruit peel cells can flow out better; the arrangement of the air duct can blow up the grapefruit peel hanging on the sharp thorns after being squeezed, and the grapefruit peel residue can move along the inner wall of the lower grinding disc to the side close to the discharge port, and the grapefruit peel will move to the discharge port for discharge after being squeezed for multiple times, which can improve the extraction rate of the grapefruit peel essential oil, and the wind blown into the space between the lower grinding disc and the upper grinding disc by the air duct can accelerate the outflow of the essential oil from the oil leakage hole, which can greatly reduce the use of spray water, improve the quality of the essential oil, and reduce the difficulty of subsequent processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 It is a cross-sectional schematic diagram of the positional relationship between the upper grinding disc and the lower grinding disc of the present invention; Figure 4 This is a schematic diagram of the lower grinding disc structure of the present invention; Figure 5 It is a schematic diagram of the air duct structure of the present invention; Figure 6 This is a schematic diagram of the support column structure of the present invention; Figure 7 The figure is a flow chart of the method of the present invention.

[0016] In the accompanying drawings, the components represented by the reference numerals are listed as follows: Support seat 1, oil outlet 2, material outlet 3, material inlet 4, lower grinding disc 5, spikes 6, oil leakage hole 7, upper grinding disc 8, air duct 9, air guide plate 10, air inlet pipe 11, blower 12, frame 13, cover plate 14, support leg 15, gear ring 16, first gear 17, first motor 18, first bevel gear 19, second bevel gear 20, second motor 21. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 7 The present invention provides a technical solution: a grapefruit essential oil extraction device, comprising a support seat 1, with an oil outlet 2 and a material outlet 3 at the bottom, and a material feed port 4 at the top; a lower grinding disc 5, which is arranged in a concave disc shape, is coaxially arranged with the support seat 1 and is rotatably connected with the support seat 1 and can self-drive to rotate around the support seat 1; spikes 6 that can pierce grapefruit peel cells are evenly arranged on the inclined inner wall, and an oil leakage hole 7 that runs through the bottom is opened, and the grapefruit essential oil can flow into the oil outlet 2 from the oil leakage hole 7 and be discharged; the spikes 6 and the oil leakage hole 7 are staggered; an upper grinding disc 8 is arranged opposite to the lower grinding disc 5, and the bottom It is configured to be convex and match the lower grinding disc 5, is rotatably connected to the support seat 1 and is eccentrically arranged with the lower grinding disc 5; its self-driven rotation direction is opposite to the rotation direction of the lower grinding disc 5; the air duct 9 is sealed and installed between the support seat 1 and the lower grinding disc 5, and is located at the farthest position between the top surface of the lower grinding disc 5 and the bottom surface of the upper grinding disc 8; the wind blown out of the air duct 9 can be blown into the top of the lower grinding disc 5 through the oil leakage hole 7 located above it, so that the residue located on the top of the lower grinding disc 5 moves to the side of the discharge port 3, so that the new material in the feed port 4 enters the grinding area between the upper grinding disc 8 and the lower grinding disc 5, and accelerates the discharge of the ground grapefruit essential oil from the oil leakage hole 7.

[0019] During operation, the cleaned grapefruit peel is put into the funnel above the feed port 4, and the grapefruit peel will enter the cavity between the lower grinding disc 5 and the upper grinding disc 8 from the feed port 4; it should be noted that, if Figure 2 and Figure 3 As shown, the lower grinding disc 5 and the upper grinding disc 8 are not coaxially arranged, and the upper grinding disc 8 is biased to the left. Therefore, the gap on the left side of the cavity between the lower grinding disc 5 and the upper grinding disc 8 is small, and the gap on the right side is large. The feed port 4 is located on the side with the large gap, and the grapefruit peel will enter the cavity on the side with the large gap from the feed port 4; then the lower grinding disc 5 and the upper grinding disc 8 rotate synchronously in opposite directions, and the rotation of the lower grinding disc 5 will drive the grapefruit peel to rotate synchronously, and the grapefruit peel will slowly rotate from the side with the large gap to the side with the small gap, and the grapefruit peel will be squeezed by the rotating upper grinding disc 8 during the movement, and the grapefruit peel will be punctured by the action of the spikes 6, and the grapefruit peel essential oil will flow out after the peel cells are punctured by the spikes 6; the grapefruit peel essential oil will fall from the oil leakage hole 7 into the cavity between the support seat 1 and the lower grinding disc 5, and then flow out from the oil outlet 2 along the inner wall of the cavity into the collection container; when the lower grinding disc 5 drives the grapefruit peel to move to the leftmost side of the cavity, the grapefruit peel is squeezed to the maximum degree, and then the grapefruit peel moves from the leftmost side of the cavity to the rightmost side; as shown Figure 2 As shown, the air duct 9 will blow the wind upward from the oil leakage hole 7 on the far right of the lower grinding disc 5 into the cavity between the lower grinding disc 5 and the upper grinding disc 8. When the wind blows out through the oil leakage hole 7, it can blow the pomelo peel hanging on the spike 6 upward, and then the pomelo peel can move a short distance to the side close to the discharge port 3 (the pomelo peel needs to move from the top of the inner wall of the lower grinding disc 5 to the bottom after multiple movements), and then the lower grinding disc 5 can drive the pomelo peel to move from the side with a large gap to the side with a small gap again, and then pass through the upper grinding disc 8 for squeezing; this reciprocating process continues until the pomelo peel moves downward to the discharge port 3 after multiple grindings, and then the pomelo peel residue can be discharged from the discharge port 3. The oil leakage hole 7 is formed on the upper surface of the pomelo peel 1 and the lower surface of the pomelo peel 1 is formed on the upper surface of the pomelo peel 1. ... , the arrangement of the air duct 9 can greatly reduce the use of spray water, can improve the quality of essential oils, and reduce the difficulty of subsequent processing; every time the grapefruit peel moves from the side with a larger cavity gap to the side close to the discharge port 3, a space will be vacated on the top of the lower grinding disc 5, and the grapefruit peel stored in the funnel can fall from the feed port 4 to the lower grinding disc 5; the present invention arranges the lower grinding disc 5 and the upper grinding disc 8 eccentrically through the arrangement of the support seat 1, the lower grinding disc 5, the upper grinding disc 8 and the air duct 9, so that the right side gap of the cavity between the lower grinding disc 5 and the upper grinding disc 8 can be larger than the left side gap, and the grapefruit peel can be fed from the side with a larger gap; then the lower grinding disc 5 can drive the grapefruit peel to The side with a larger gap rotates toward the side with a smaller gap. During this process, the grapefruit peel can be gradually squeezed, and the essential oil in the grapefruit peel cells can flow out better. The arrangement of the air duct 9 can blow up the grapefruit peel hanging on the spikes 6 after being squeezed, and the grapefruit peel residue can move along the inner wall of the lower grinding disc 5 to the side close to the discharge port 3. The grapefruit peel will move to the discharge port for discharge after being squeezed multiple times, which can improve the extraction rate of the grapefruit peel essential oil. The wind blown into the space between the lower grinding disc 5 and the upper grinding disc 9 by the air duct 9 can accelerate the outflow of the essential oil from the oil leakage hole 7, which can greatly reduce the use of spray water, improve the quality of the essential oil, and reduce the difficulty of subsequent processing.

[0020] Specifically, Figure 3 As shown, the inclination angle of the top surface of the lower grinding disc 5 is smaller than the inclination angle of the bottom surface of the upper grinding disc 8 .

[0021] During operation, the top surface of the lower grinding disc 5 and the bottom surface of the upper grinding disc 8 are not parallel to each other but have a certain angle, and the inclination angle of the top surface of the lower grinding disc 5 is smaller than the inclination angle of the bottom surface of the upper grinding disc 8, that is, the gap in the cavity between the lower grinding disc 5 and the upper grinding disc 8 gradually decreases from top to bottom. Therefore, when the grapefruit peel slides down after being blown up by the wind at the rightmost side of the cavity, it can only move downward for a short distance. Then, when the lower grinding disc 5 drives the grapefruit peel to rotate, the lower grinding disc 8 can further crush the grapefruit peel, which can ensure that the grapefruit peel will be discharged in sequence after multiple and step-by-step squeezing, thereby greatly improving the extraction rate of grapefruit essential oil.

[0022] Specifically, Figure 2 and Figure 5 As shown, the air duct 9 includes an air duct plate 10, which is fixed to the support base 1, has an open top and the top surface is in contact with the bottom surface of the lower grinding disc 5; an air inlet pipe 11, the top of which passes through the bottom of the air duct plate 10 and is connected to the inner cavity of the air duct plate 10; and a blower 12, which is connected to the air inlet pipe 11.

[0023] When working, the blower 12 can blow air into and out of the air inlet plate 10 through the air inlet pipe 11, and then the air can be blown into the cavity between the lower grinding disc 5 and the upper grinding disc 8 through the oil leakage hole 7 above the air inlet plate 10.

[0024] Specifically, Figure 2 and 6 As shown, the support seat 1 includes a frame 13, which is used to support the lower grinding disc 5 and is equipped with a bearing, the inner ring of the bearing is fixedly connected to the lower grinding disc 5, and the oil outlet 2 and the material outlet 3 are both opened at the bottom of the frame 13; the cover plate 14 is fixedly connected to the frame 13 and is used to support the upper grinding disc 8, and the feed port 4 is opened at the top of the frame 13 near the air duct 9; the support leg 15 is used to support and fix the frame 13; the frame 13 and the cover plate 14 are fixed by bolts and nuts.

[0025] During operation, when the extraction device needs to be cleaned, the nut on the top of the cover plate 14 can be unscrewed, the cover plate 14 and the upper grinding disc 8 can be removed, and then the upper grinding disc 8, the lower grinding disc 5 and the frame 13 can be cleaned respectively, which can greatly improve the cleaning efficiency of the extraction device.

[0026] Specifically, Figure 2 As shown, a gear ring 16 is fixedly connected to the outer circumferential side wall of the lower grinding disc 5, and the gear ring 16 is meshed with a first gear 17. The first gear 17 is transmission-connected to a first motor 18, and the first motor 18 is mounted on the side wall of the frame 13; when the first motor 18 is working, it can drive the gear ring 16 and the lower grinding disc 5 to rotate through the first gear 17.

[0027] Specifically, Figure 2As shown, a first bevel gear 19 is fixedly connected to the rotating shaft of the upper grinding disc 8, the first bevel gear 19 is meshed with a second bevel gear 20, the second bevel gear 20 is transmission-connected to a second motor 21, and the second motor 21 is installed on the top of the cover plate 14; when the second motor 21 is working, it can drive the first bevel gear 19 and the upper grinding disc 8 to rotate through the second bevel gear 20.

[0028] A method for extracting grapefruit essential oil, the method comprising the following steps: Step 1: Select fresh grapefruits that are free of pests and diseases and are not moldy as raw materials; peel the grapefruit skin, remove the white spongy part and the pulp, and keep the yellow skin part as the raw material for extracting grapefruit peel essential oil; Step 2: Wash the surface impurities and dirt of the grapefruit peel, soak the grapefruit peel in 0.5% sodium carbonate (Na2CO3) solution for 1 to 3 minutes to further remove the residue and impurities on the surface, and then rinse with clean water and drain; Step 3: Add the washed and drained grapefruit peel into the extraction device from the feed port 4, the lower grinding disc 5 rotates to drive the grapefruit peel to rotate continuously, the upper grinding disc 8 rotates to cooperate with the spikes 6 on the lower grinding disc 5 to scratch the peel cells, and the grapefruit essential oil that flows out will flow out from the oil outlet 2 and be collected; Step 4: After the ground grapefruit peel is rotated to the top of the air duct 9, the wind blown into the air duct 9 will push the grapefruit peel to move downward along the inner wall of the lower grinding disc 5 until the grapefruit peel residue falls from the discharge port 3; Step 5: After the extraction device is finished working, the support base 1, the lower grinding disc 5 and the upper grinding disc 8 are cleaned and maintained.

[0029] The invention discloses an application of a grapefruit essential oil extraction device, which is used for preparing grapefruit essential oil containing d-limonene (61.7%-73.4%), β-myrcene (16.4%-28.2%), β-pinene (0.3%-1.5%), germacrene (0.3%-1.4%), proto-grapeone (0.1%-1.3%), α-pinene (0.1%-0.4%), linalool (0.2%-0.3%) and aurantol (1.6%-1.9%) in components and concentrations.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grapefruit essential oil extraction device, characterized in that: include A support seat (1) is provided with an oil outlet (2) and a material outlet (3) at the bottom, and a material inlet (4) at the top; The lower grinding disc (5) is configured to be in a concave disc shape, is coaxially arranged with the support seat (1), is rotatably connected with the support seat (1), and can self-drive to rotate around the support seat (1); spikes (6) capable of piercing grapefruit peel cells are evenly arranged on the inclined inner wall, and an oil leakage hole (7) is provided through the bottom thereof, and grapefruit essential oil can flow into the oil outlet (2) from the oil leakage hole (7) and be discharged; the spikes (6) and the oil leakage hole (7) are staggered; The upper grinding disc (8) is arranged opposite to the lower grinding disc (5), the bottom of which is arranged in a convex shape matching the lower grinding disc (5), is rotatably connected to the support seat (1) and is eccentrically arranged with the lower grinding disc (5); its self-driven rotation direction is opposite to the rotation direction of the lower grinding disc (5); The air duct (9) is sealed and installed between the support seat (1) and the lower grinding disc (5), and is located at a position farthest from the top surface of the lower grinding disc (5) and the bottom surface of the upper grinding disc (8); The air blown out of the air duct (9) can be blown into the top of the lower grinding disc (5) through the oil leakage hole (7) located above the air duct, so that the residue located on the top of the lower grinding disc (5) moves toward the side of the discharge port (3), so that the new material in the feed port (4) enters the grinding area between the upper grinding disc (8) and the lower grinding disc (5), and accelerates the discharge of the ground grapefruit essential oil from the oil leakage hole (7).

2. A grapefruit essential oil extraction device according to claim 1, characterized in that: The inclination angle of the top surface of the lower grinding disc (5) is smaller than the inclination angle of the bottom surface of the upper grinding disc (8).

3. A grapefruit essential oil extraction device according to claim 1, characterized in that: The air duct (9) comprises An air induction plate (10) is fixedly connected to the support seat (1), has an open top and a top surface that is in contact with the bottom surface of the lower grinding disc (5); An air inlet pipe (11), the top of which passes through the bottom of the air induction plate (10) and is in communication with the inner cavity of the air induction plate (10); The blower (12) is connected to the air inlet pipe (11).

4. A grapefruit essential oil extraction device according to claim 1, characterized in that: The support seat (1) comprises A frame (13) is used to support the lower grinding disc (5) and is provided with a bearing, wherein the inner ring of the bearing is fixedly connected to the lower grinding disc (5), and the oil outlet (2) and the material outlet (3) are both provided at the bottom of the frame (13); The cover plate (14) is fixedly connected to the frame (13) and is used to support the upper grinding disc (8); the feed port (4) is opened on the top of the frame (13) near the air duct (9); The legs (15) are used to support and fix the frame (13).

5. A grapefruit essential oil extraction device according to claim 4, characterized in that: The frame (13) and the cover plate (14) are fixed by bolts and nuts.

6. A grapefruit essential oil extraction device according to claim 4, characterized in that: A gear ring (16) is fixedly connected to the outer circumferential side wall of the lower grinding disc (5), the gear ring (16) is meshed with a first gear (17), the first gear (17) is transmission-connected to a first motor (18), and the first motor (18) is mounted on the side wall of the frame (13).

7. A grapefruit essential oil extraction device according to claim 4, characterized in that: A first bevel gear (19) is fixedly connected to the rotating shaft of the upper grinding disc (8); the first bevel gear (19) is meshed with a second bevel gear (20); the second bevel gear (20) is transmission-connected to a second motor (21); and the second motor (21) is mounted on the top of the cover plate (14).

8. A method for extracting grapefruit essential oil, applicable to the grapefruit essential oil extraction device according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: Step 1: Select fresh grapefruits that are free of pests and diseases and are not moldy as raw materials; peel the grapefruit skin, remove the white spongy part and the pulp, and keep the yellow skin part as the raw material for extracting grapefruit peel essential oil; Step 2: Wash the surface impurities and dirt of the grapefruit peel, soak the grapefruit peel in 0.5% sodium carbonate solution for 1 to 3 minutes to further remove the residue and impurities on the surface, and then rinse with clean water and drain; Step 3: Add the washed and drained grapefruit peel into the extraction device from the feed port (4), the lower grinding disc (5) rotates to drive the grapefruit peel to rotate continuously, the upper grinding disc (8) rotates in coordination with the spikes (6) on the lower grinding disc (5) to break the peel cells, and the grapefruit essential oil that flows out will flow out from the oil outlet (2) and be collected; Step 4: After the ground grapefruit peel is rotated to the top of the air duct (9), the wind blown into the air duct (9) will push the grapefruit peel to move downward along the inner wall of the lower grinding disc (5) until the grapefruit peel residue falls from the discharge port (3); Step 5: After the extraction device is finished working, the support base (1), the lower grinding disc (5) and the upper grinding disc (8) are cleaned and maintained.

9. The use of a grapefruit essential oil extraction device as claimed in any one of claims 1 to 7, characterized in that: Used to prepare grapefruit essential oil whose ingredients and concentrations contain d-limonene (61.7%~73.4%), β-myrcene (16.4%~28.2%), β-pinene (0.3%~1.5%), germacrene (0.3%~1.4%), proto-noketone (0.1%~1.3%), α-pinene (0.1%~0.4%), linalool (0.2%~0.3%) and aurantol (1.6%~1.9%).

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