Extraction method and extraction device of rice bran oil

Abstract

The invention provides an extraction method and an extraction device of rice bran oil, and relates to the technical field of vegetable oil extraction, a centrifugal assembly, a bracket, an extraction assembly and a conveying line are used for carrying out centrifugal treatment on wet meal and then conveying the wet meal into an evapo-separated machine. According to the invention, the wet meal is subjected to centrifugal treatment, so that liquid in the wet meal is rapidly separated out, residues of organic solvents in the wet meal are reduced, and during subsequent desolventizing treatment, high efficiency and energy conservation can be realized; and the wet meal is subjected to centrifugal treatment, so that the time for standing the wet meal to separate liquid is saved, and the extraction efficiency of the rice bran oil can be improved.

Description

Technical Field

[0001] This invention relates to the field of vegetable oil extraction technology, specifically to a method and apparatus for extracting rice bran oil. Background Technology

[0002] Rice bran oil extraction methods are mainly divided into two categories: pressing and solvent extraction. Mechanical pressing involves applying significant physical pressure to pre-treated rice bran to extract the oil. This method is simple and produces crude oil with a rich flavor, but the oil yield is relatively low, and the high temperatures during hot pressing can destroy valuable nutrients such as oryzanol in the rice bran. Solvent extraction, on the other hand, uses organic solvents such as hexane to extract the oil from the rice bran. This method has a high oil yield and is currently the mainstream method for extracting rice bran oil.

[0003] The extracted material is called "wet meal," which still contains a large amount of residual organic solvents (usually accounting for 25% to 35% of the weight of the wet meal). It must undergo desolventizing treatment to obtain a safe finished meal. The steam desolventizer directly injects high-temperature steam into contact with the wet meal, using heat energy to force the solvent to vaporize and achieve desolventizing. This process consumes a large amount of steam and is one of the largest energy-consuming units in the leaching workshop, resulting in high production costs for rice bran oil. Therefore, this invention provides a method and apparatus for extracting rice bran oil. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method and apparatus for extracting rice bran oil, which solves the problem of high production costs in existing rice bran oil extraction processes.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A method for extracting rice bran oil includes the following steps: S1. The rice bran is puffed to obtain pretreated material; S2. The pretreated material is fed into the extraction device for solvent leaching to obtain a mixed liquid and wet meal. S3. The wet meal is centrifuged and then sent to a steam desalination machine to obtain the finished meal; the mixed liquor is decolorized, deodorized, dewaxed, degummed and degreased to obtain rice bran oil.

[0006] Centrifugation of the wet rice meal quickly separates the liquid from it, reducing the residue of organic solvents and making subsequent evaporation more efficient and energy-saving. Centrifugation also saves time that would otherwise be spent on separating the liquid from the wet meal, thus improving the extraction efficiency of rice bran oil.

[0007] An apparatus for extracting rice bran oil, comprising: A centrifugal assembly, wherein a conveyor line is provided at the bottom discharge end of the centrifugal assembly; An extraction component is fixedly mounted above a centrifugal component via a bracket, with the top feed end of the centrifugal component corresponding to the bottom discharge end of the extraction component.

[0008] Preferably, the extraction component includes: The second annular shell has several first partition plates fixedly connected inside it. A liquid storage chamber is formed inside the second annular shell and between two adjacent first partition plates. A solvent pumping system is installed on the second annular shell. The solvent pumping system is used to pump organic solvent between the corresponding liquid storage chamber and the material storage chamber. A fixed outer cylinder is fixedly installed on the top of the second annular shell, and the bottom end of the fixed outer cylinder is tapered and fixed to the inner side of the second annular shell; A rotating inner cylinder is rotatably installed inside a fixed outer cylinder. A central cylinder is fixedly installed at the center of the rotating inner cylinder. Several second partition plates are fixedly installed in the annular area between the central cylinder and the rotating inner cylinder. A storage chamber is formed between the central cylinder and the rotating inner cylinder and between two adjacent second partition plates. The bottom end of the rotating inner cylinder is conical and is fixedly connected to the bottom end of the central cylinder. A discharge structure is provided inside the central cylinder and near the bottom; The bottom inner side of the fixed outer cylinder and the bottom outer side of the rotating inner cylinder form an annular cavity. Several misaligned guide plates are fixedly connected to the bottom inner side of the fixed outer cylinder. Two adjacent misaligned guide plates form a misaligned guide channel. A second hole corresponding to the misaligned guide channel is opened on the side of the rotating inner cylinder. A first hole corresponding to the misaligned guide channel is opened on the side of the fixed outer cylinder.

[0009] Preferably, the first partition plate and the second partition plate are each provided with six, forming a first liquid storage chamber to a sixth liquid storage chamber and a first material storage chamber to a sixth material storage chamber arranged clockwise; The solvent pumping system includes: five circulating pump groups, a liquid outlet pump group, and a solvent addition pipeline connected to a second liquid storage chamber; Five circulating pump sets are installed between the second liquid storage chamber to the sixth liquid storage chamber and between the second material storage chamber to the sixth material storage chamber, and the liquid discharge pump set is installed in the first liquid storage chamber; The circulating pump set includes: a first pump body, a column pipe, and a spray pipe. The column pipe is fixedly installed at the liquid outlet end of the first pump body, and the spray pipe is fixedly installed at the top of the column pipe, and the spray pipe is located above the storage chamber. The liquid discharge pump assembly includes: a second pump body and a liquid discharge pipe, with the liquid discharge pipe installed at the liquid discharge end of the second pump body.

[0010] Preferably, the discharge structure includes: Multiple discharge ports are opened inside the central cylinder and near the bottom; A baffle cylinder is fixedly connected to the fixed outer cylinder and located inside the central cylinder. The side of the baffle cylinder is provided with a sliding port corresponding to the discharge port, and an arc-shaped baffle is slidably installed inside the sliding port. A drive assembly is fixedly installed at the bottom of the baffle cylinder, and the actuating end of the drive assembly is fixedly connected to the arc-shaped baffle.

[0011] Preferably, the driving component includes: A protective housing, which is annular and fixedly installed on the outside of the central cylinder; A threaded rod is vertically rotatably installed inside the protective housing. A threaded fitting is threaded onto the threaded rod. A connecting frame is fixedly connected to the side of the threaded fitting. The connecting frame is fixedly connected to the arc-shaped baffle. A guide rod is vertically fixed inside the protective housing, and the threaded fitting is slidably engaged with the guide rod; A first gear is fixedly connected to the side of the threaded rod, a gear ring that meshes with the first gear is rotatably installed on the inner side of the protective housing, a first motor is fixedly connected to the inner wall of the protective housing, and a second gear is fixedly installed at the output end of the first motor, the second gear meshing with the gear ring.

[0012] Preferably, the centrifugation assembly includes: A support platform, the bottom of which is fixedly installed with a high pole frame, the support platform is ring-shaped, and a central platform is fixedly connected to the center of the support platform through several connecting blocks; The first annular shell is fixedly installed on the top of the support platform, and the inner wall of the first annular shell is set as a screen part. A material discharge gap is formed between several connecting blocks, and the material discharge gap is located on the inner side of the first annular shell. A centrifuge disc is rotatably mounted at the top center of a central platform, and a drive motor is fixedly mounted at the bottom of the central platform. The output end of the drive motor is connected to the centrifuge disc for transmission.

[0013] Preferably, a double-layered diversion cylinder is fixedly connected to the bottom of the support platform, and the top of the double-layered diversion cylinder corresponds to the material drop gap.

[0014] Preferably, the centrifugal disc includes: a base, a central shaft fixedly connected to the top of the base, L-shaped plates fixedly connected to the top of the base and the side of the central shaft, a plurality of L-shaped plates being provided, a material feeding area being formed between two adjacent L-shaped plates, and a connecting shaft fixedly connected to the bottom of the base, the connecting shaft being rotatably connected to the central platform.

[0015] Preferably, it further includes: an operating structure, which is fixedly disposed above the extraction assembly for operating the rotation of the rotating inner cylinder.

[0016] This invention provides a method and apparatus for extracting rice bran oil. It has the following beneficial effects: This invention uses centrifugation to quickly separate the liquid from the wet rice meal, reducing the residue of organic solvents and making subsequent evaporation more efficient and energy-saving. Furthermore, centrifugation saves time that would otherwise be spent on separating the liquid from the wet meal, thereby improving the extraction efficiency of rice bran oil.

[0017] This invention improves the rice bran oil extraction device by placing the centrifugal component at the bottom discharge end of the extraction component. This allows for direct centrifugation of the resulting "wet meal" after extraction, quickly obtaining a relatively dry wet meal. Subsequent evaporation and desalination processes are more efficient and energy-saving. Furthermore, it saves time spent allowing the wet meal to settle and separate from the liquid, thus improving the extraction efficiency of rice bran oil. Specifically, the extraction component is designed with multiple material storage chambers and multiple liquid storage chambers. An organic solution is pumped to the top of the corresponding material storage chamber using a solvent pumping system. The organic solution flows downwards through the pre-treated material inside the material storage chamber. A staggered guide channel below the material storage chamber guides the organic solution (which has undergone one extraction of the pre-treated material) to the adjacent liquid storage chamber. This allows for continuous extraction of the pre-treated material inside multiple material storage chambers. By rotating the inner cylinder, the positions of the multiple material storage chambers are alternated, allowing the chamber that has undergone multiple extractions to rotate to the feeding position, quickly discharging the wet meal and adding new pre-treated material, thereby achieving highly efficient extraction. Attached Figure Description

[0018] Figure 1 This is a perspective view of a rice bran oil extraction apparatus proposed in this invention; Figure 2 This is a front view of a rice bran oil extraction apparatus proposed in this invention; Figure 3 This is a top view of a rice bran oil extraction apparatus proposed in this invention; Figure 4 for Figure 3 Cross-sectional view of section line AA in the middle; Figure 5 for Figure 4 Enlarged view of section B in the middle; Figure 6 This is a perspective view of the centrifuge disc of a rice bran oil extraction device proposed in this invention; Figure 7 This is a perspective view of the extraction component of a rice bran oil extraction device proposed in this invention; Figure 8 This is a front view of the extraction component of a rice bran oil extraction device proposed in this invention; Figure 9 This is a top view of the extraction component of a rice bran oil extraction device proposed in this invention; Figure 10 This is a schematic diagram showing the flow of organic solvent and material during the extraction process of a rice bran oil extraction device proposed in this invention. Figure 11 for Figure 9 A sectional view of the section line at point CC; Figure 12 This is a perspective view of the rotating inner cylinder of a rice bran oil extraction device proposed in this invention; Figure 13 This is a perspective view of the fixed outer cylinder of a rice bran oil extraction device proposed in this invention; Figure 14 This is a perspective view of the discharge component of a rice bran oil extraction device proposed in this invention.

[0019] The components include: 1. Centrifuge assembly; 101. High pole frame; 102. Support platform; 103. First annular shell; 104. Screen section; 105. Central platform; 106. Centrifuge disc; 1061. Central shaft; 1062. Chassis; 1063. Connecting shaft; 1064. L-shaped plate; 1065. Feeding area; 107. Connecting block; 108. Double-layer diversion tube; 109. Drive motor; 2. Support frame; 3. Extraction assembly; 301. Second annular shell; 302. First partition plate; 303. Solvent pumping system; 3031. Circulating pump group; 30311. First pump body; 30312. Vertical column pipe; 30313. Spraying pipe; 3032. Liquid discharge pump group; 30321. Second pump body; 30322. Liquid discharge pipe; 3033. 304 Solvent adding pipe; 305 Fixed outer cylinder; 306 Rotating inner cylinder; 307 Central cylinder; 308 Second partition plate; 309 Annular cavity; 3000 Displacement guide plate; 3010 First hole; 3011 Second hole; 3012 Discharge port; 3013 Baffle cylinder; 3014 Drive assembly; 30141 Protective housing; 30142 Threaded rod; 30143 First gear; 30144 Threaded fitting; 30145 Guide rod; 30146 Connecting frame; 30147 First motor; 30148 Second gear; 30149 Gear ring; 3015 Arc-shaped baffle; 4. Conveyor line; a1-a6 represent the first storage chamber to the sixth storage chamber; b1-b6 represent the first liquid storage chamber to the sixth liquid storage chamber. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0021] A method for extracting rice bran oil includes the following steps: first, the rice bran is puffed, specifically by adjusting the temperature and humidity of the rice bran and mixing in an appropriate amount of preservatives, and then fed into a puffing device to obtain a pretreated material; then, the pretreated material is fed into an extraction device for solvent extraction to obtain a mixed liquid and a wet meal; the wet meal output from the extraction device has a high liquid content, so the wet meal is first centrifuged and then fed into a steam desalination machine to obtain a finished meal; and the mixed liquid is then decolorized, deodorized, dewaxed, degummed, and degreased to obtain rice bran oil.

[0022] Centrifugation of the wet meal quickly separates the liquid from the meal, reducing the residue of organic solvents. This makes subsequent evaporation and desalination more efficient and energy-saving. Centrifugation also saves time that would otherwise be spent on separating the liquid from the wet meal, thus improving the extraction efficiency of rice bran oil. Example

[0023] Please refer to the attached document. Figures 1-14 This embodiment provides a rice bran oil extraction device, which belongs to the field of vegetable oil extraction and is used in the rice bran oil extraction method described in Embodiment 1. Specifically, it includes: a centrifugal assembly 1, a support 2, an extraction assembly 3, and a conveyor line 4.

[0024] The centrifugal assembly 1 is equipped with a conveyor line 4 at its bottom discharge end. The extraction assembly 3 is fixedly mounted above the centrifugal assembly 1 via a bracket 2, and the top feed end of the centrifugal assembly 1 corresponds to the bottom discharge end of the extraction assembly 3.

[0025] During operation, the extraction component 3 extracts the pretreated rice bran, and the resulting "wet meal" is directly fed into the centrifuge component 1 for centrifugal separation. The liquid in the wet meal is quickly separated to reduce the residue of organic solvents inside. The wet meal is output from the bottom discharge end of the centrifuge component 1 and falls onto the conveyor line 4. The conveyor line 4 sends the processed wet meal to the desiccant or temporary storage silo.

[0026] Please refer to the attached document. Figure 4 , Figures 7-14 The extraction component 3 includes: a second annular shell 301, a solvent pumping system 303, a fixed outer cylinder 304, a rotating inner cylinder 305, a central cylinder 306, a misaligned guide plate 309, and a discharge structure.

[0027] Several first partition plates 302 are fixedly connected inside the second annular shell 301. A liquid storage chamber is formed inside the second annular shell 301 between adjacent first partition plates 302. This liquid storage chamber is used to temporarily store organic solutions and mixtures. A solvent pumping system 303 is installed on the second annular shell 301. The solvent pumping system 303 is used to pump organic solvents between corresponding liquid and material storage chambers. A fixed outer cylinder 304 is fixedly installed on the top of the second annular shell 301. The bottom end of the fixed outer cylinder 304 is conical and fixed to the inner side of the second annular shell 301. The inner side of the second annular shell 301 and the bottom end of the fixed outer cylinder 304 can share a side surface, or they can be designed as a double-layer structure. A rotating inner cylinder 305 is rotatably installed inside the fixed outer cylinder 304. A central cylinder 306 is fixedly provided at the center of the rotating inner cylinder 305. Several second partition plates 307 are fixedly arranged in the annular area between the central cylinder 306 and the rotating inner cylinder 305. A storage chamber is formed between the central cylinder 306 and the rotating inner cylinder 305 and between two adjacent second partition plates 307. The storage chamber is used to store pre-treated rice bran. The bottom end of the rotating inner cylinder 305 is conical and is fixedly connected to the bottom end of the central cylinder 306. The bottom end of the rotating inner cylinder 305 contracts inward so that the inner diameter of the bottom end is consistent with the outer diameter of the bottom end of the central cylinder 306. During use, the central cylinder 306 is subjected to pressure from the rice bran inside the storage chamber from all directions. Structural components (such as vertical plates, discs, etc.) can be designed inside the central cylinder 306 to increase the structural strength of the central cylinder 306. A discharge structure is provided on the inner side of the central cylinder 306 near the bottom. The discharge structure is used to control the discharge of extracted rice bran from the corresponding storage chamber.

[0028] The inner bottom of the fixed outer cylinder 304 and the outer bottom of the rotating inner cylinder 305 form an annular cavity 308. Several misaligned guide plates 309 are fixedly connected to the inner bottom of the fixed outer cylinder 304. Two adjacent misaligned guide plates 309 form a misaligned guide channel. The side of the rotating inner cylinder 305 is provided with a second hole 3011 corresponding to the misaligned guide channel. The side of the fixed outer cylinder 304 is provided with a first hole 3010 corresponding to the misaligned guide channel. The mixture produced by extraction in a certain storage chamber inside the rotating inner cylinder 305 flows downward, flows into the misaligned guide channel through the corresponding second hole 3011, is guided by the misaligned guide channel, and flows to the adjacent storage chamber through the first hole 3010.

[0029] In one specific embodiment, please refer to the appendix. Figures 9-10 The first partition plate 302 and the second partition plate 307 are each provided with six, forming the first liquid storage chamber to the sixth liquid storage chamber b1-b6 and the first material storage chamber to the sixth material storage chamber a1-a6 distributed clockwise.

[0030] The solvent pumping system 303 includes: five circulating pump sets 3031, a liquid discharge pump set 3032, and a solvent addition pipeline 3033 connected to the second liquid storage chamber b2.

[0031] Five circulating pump sets 3031 are installed between the second to sixth liquid storage chambers b2-b6 and the second to sixth material storage chambers a2-a6. A discharge pump set 3032 is installed in the first liquid storage chamber b1. Each circulating pump set 3031 includes a first pump body 30311, a column pipe 30312, and a spray pipe 30313. The column pipe 30312 is fixedly installed at the discharge end of the first pump body 30311, and the spray pipe 30313 is fixedly installed on top of the column pipe 30312. 30313 is located above the storage chamber. For example, when the first pump body 30311 is working, it pumps the liquid in the second storage chamber b2 upward, and after passing through the column pipe 30312, it sprays downward from the spray pipe 30313 towards the second storage chamber a2. The liquid discharge pump group 3032 includes: the second pump body 30321 and the liquid discharge pipe 30322. The liquid discharge pipe 30322 is installed at the liquid discharge end of the second pump body 30321. When the second pump body 30321 is working, it pumps the mixed liquid in the first storage chamber b1 out.

[0032] Please refer to the attached document. Figure 9 Appendix Figure 10 During the operation of extraction component 3, an appropriate amount of pretreated material is added to the first storage chamber a1. Then, the rotating inner cylinder 305 is rotated to a fixed angle, causing the first storage chamber a1 to move to the sixth storage chamber a6. The solvent pumping system 303 is then activated, and the external system continuously adds organic solvent to the second storage chamber b2 through the solvent addition pipe 3033. The circulating pump group 3031 corresponding to the second storage chamber b2 transports the organic solvent from the second storage chamber b2 to the material in the second storage chamber a2 for extraction. During the extraction process, the second storage chamber a2... The outflowing mixture flows into the third storage chamber b3 through the corresponding staggered guide channel. The circulation pump group 3031 corresponding to the third storage chamber b3 operates, and the mixture produced by the last extraction is collected in the first storage chamber b1 in this cycle. The discharge pump group 3032 transports the mixture in the first storage chamber b1 outward. The rotating inner cylinder 305 rotates the second storage chamber a2 to the position of the first storage chamber a1. The material in the first storage chamber a1 after the change of position is discharged by the discharge structure, and new pre-treated material is added, thus realizing the cycle of the extraction process.

[0033] In one embodiment, the discharge structure includes: a plurality of discharge ports 3012 opened inside the central cylinder 306 and near the bottom, a baffle cylinder 3013, an arc-shaped baffle 3015, and a drive assembly 3014.

[0034] The baffle cylinder 3013 is fixedly connected to the fixed outer cylinder 304, and the baffle cylinder 3013 is located inside the central cylinder 306. The side of the baffle cylinder 3013 is provided with a sliding port corresponding to the discharge port 3012. An arc-shaped baffle 3015 is slidably installed inside the sliding port. The drive assembly 3014 is fixedly installed at the bottom of the baffle cylinder 3013, and the actuating end of the drive assembly 3014 is fixedly connected to the arc-shaped baffle 3015.

[0035] The sliding port is aligned with the discharge port 3012 at the position of the first storage chamber a1, and the baffle cylinder 3013 blocks the discharge port 3012 at the position of the first storage chamber a1. During unloading, the drive component 3014 manipulates the arc-shaped baffle 3015 to slide downward, so that the sliding port is aligned with the discharge port 3012 at the position of the first storage chamber a1. The material inside the first storage chamber a1 flows downward from the inside of the baffle cylinder 3013 through the discharge port 3012 and the sliding port. After unloading is completed, the arc-shaped baffle 3015 is controlled to block the discharge port 3012 at the position of the first storage chamber a1 upward.

[0036] In one embodiment, the drive assembly 3014 includes: a protective housing 30141, a threaded rod 30142, a threaded fitting 30144, a guide rod 30145, a first gear 30143, a gear ring 30149, a first motor 30147, and a second gear 30148.

[0037] The protective housing 30141 is annular and fixedly installed on the outside of the central cylinder 306. The threaded rod 30142 is rotatably installed on the inside of the protective housing 30141 and is vertically positioned. A threaded fitting 30144 is threaded onto the threaded rod 30142. A connecting bracket 30146 is fixedly connected to the side of the threaded fitting 30144. The connecting bracket 30146 is fixedly connected to the arc-shaped baffle 3015. The connecting bracket 30146 and the protective housing 30141 are in sliding engagement. The connecting bracket 30146 and the threaded fitting 30144 move synchronously. A guide rod 30145 is fixedly installed on the inside of the protective housing 30141 and is also vertically positioned. The threaded assembly 30144 is slidably engaged with the guide rod 30145, which restricts the rotation of the threaded assembly 30144. A first gear 30143 is fixedly connected to the side of the threaded rod 30142. A gear ring 30149 that meshes with the first gear 30143 is rotatably mounted on the inner side of the protective housing 30141. A first motor 30147 is fixedly connected to the inner wall of the protective housing 30141. A second gear 30148 is fixedly mounted on the output end of the first motor 30147. The second gear 30148 meshes with the gear ring 30149. The first motor 30147 and the threaded rod 30142 are symmetrically arranged on both sides to stabilize the center of gravity of the drive assembly 3014.

[0038] During operation, the first motor 30147 drives the second gear 30148 to rotate, which in turn drives the gear ring 30149 to rotate. The gear ring 30149 drives the first gear 30143 to rotate. The first gear 30143 is fixed to the threaded rod 30142, thereby driving the threaded rod 30142 to rotate synchronously. The threaded rod 30142 is threadedly engaged with the threaded assembly 30144, thus driving the threaded assembly 30144 to move up and down, thereby driving the connecting frame 30146 to move.

[0039] In one embodiment, the centrifuge assembly 1 includes: a support platform 102, a high pole frame 101, a first annular shell 103, a central platform 105, a centrifuge disc 106, and a drive motor 109.

[0040] A high pole frame 101 is fixedly installed at the bottom of the support platform 102. The high pole frame 101 raises the support platform 102, making it easier to set up the conveyor line 4 below the support platform 102. The support platform 102 is annular. A central platform 105 is fixedly connected to the center of the support platform 102 through several connecting blocks 107. A first annular shell 103 is fixedly installed on the top of the support platform 102, and the inner wall of the first annular shell 103 is set as a screen part 104. The screen part 104 is used to separate materials and liquids. In order to avoid the screen part 104 from being stuck with materials, the screen part 104 can be tilted downward. A material drop gap is formed between several connecting blocks 107. The material drop gap is located on the inner side of the first annular shell 103. A centrifugal disc 106 is rotatably installed at the top center of the central platform 105. A drive motor 109 is fixedly installed at the bottom of the central platform 105. The output end of the drive motor 109 is connected to the centrifugal disc 106 for transmission.

[0041] During operation, the material falls onto the centrifugal disc 106, and the drive motor 109 drives the centrifugal disc 106 to rotate. The centrifugal disc 106 drives the material to rotate outward and brush out, and impacts the screen section 104. The liquid passes through the screen section 104 and enters the interior of the first annular shell 103. The material blocked at the screen section 104 falls downward and falls downward through the material drop gap.

[0042] In one embodiment, a double-layered guide tube 108 is fixedly connected to the bottom of the support platform 102. The top of the double-layered guide tube 108 corresponds to the material drop gap. The double-layered guide tube 108 is used to guide the material falling through the material drop gap, avoiding contact between the material and the drive motor 109, and can effectively protect the drive motor 109.

[0043] In one embodiment, the centrifugal disc 106 includes: a base 1062, a central shaft 1061 fixedly connected to the top of the base 1062, L-shaped plates 1064 fixedly connected to the top of the base 1062 and the side of the central shaft 1061, a plurality of L-shaped plates 1064 are provided, a feeding area 1065 is formed between two adjacent L-shaped plates 1064, and a connecting shaft 1063 fixedly connected to the bottom of the base 1062, the connecting shaft 1063 being rotatably connected to the central platform 105.

[0044] The material is dropped into the feeding area 1065 between two adjacent L-shaped plates 1064. The L-shaped plates 1064 can drive the material to rotate. When the material has sufficient speed, it is thrown outward under the action of centrifugal force. This structural design can further improve the force of throwing the material outward.

[0045] In one embodiment, it further includes: an operating structure, which is fixedly disposed above the extraction assembly 3 and is used to operate the rotating inner cylinder 305 to rotate. The rotating inner cylinder 305 can be driven to rotate manually or by a motor. Generally, an inverted motor and reducer structure is designed above the extraction assembly 3. The output end of the inverted motor and reducer structure is fixedly installed to the top of the central cylinder 306 through a flange structure.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for extracting rice bran oil, characterized in that, Includes the following steps: S1. The rice bran is puffed to obtain pretreated material; S2. The pretreated material is fed into the extraction device for solvent leaching to obtain a mixed liquid and wet meal. S3. The wet meal is centrifuged and then sent to a steam desalination machine to obtain the finished meal; the mixed liquor is decolorized, deodorized, dewaxed, degummed and degreased to obtain rice bran oil.

2. A rice bran oil extraction apparatus, characterized in that, include: Centrifugal assembly (1), the bottom discharge end of the centrifugal assembly (1) is provided with a conveyor line (4); Extraction component (3) is fixedly mounted above centrifugal component (1) by bracket (2), and the top feed end of centrifugal component (1) corresponds to the bottom discharge end of extraction component (3).

3. The rice bran oil extraction apparatus according to claim 2, characterized in that, The extraction component (3) includes: The second annular shell (301) has several first partition plates (302) fixedly connected inside. A liquid storage chamber is formed inside the second annular shell (301) and between two adjacent first partition plates (302). A solvent pumping system (303) is installed on the second annular shell (301). The solvent pumping system (303) is used to pump organic solvent between the corresponding liquid storage chamber and the material storage chamber. A fixed outer cylinder (304) is fixedly installed on the top of the second annular shell (301). The bottom end of the fixed outer cylinder (304) is conical and fixed to the inner side of the second annular shell (301). A rotating inner cylinder (305) is rotatably installed inside a fixed outer cylinder (304). A central cylinder (306) is fixedly provided at the center of the rotating inner cylinder (305). Several second partition plates (307) are fixedly provided in the annular area between the central cylinder (306) and the rotating inner cylinder (305). A storage chamber is formed between the central cylinder (306) and the rotating inner cylinder (305) and between two adjacent second partition plates (307). The bottom end of the rotating inner cylinder (305) is conical, and the bottom end of the rotating inner cylinder (305) is fixedly connected to the bottom end of the central cylinder (306). A discharge structure is provided inside the central cylinder (306) and near the bottom; The bottom inner side of the fixed outer cylinder (304) and the bottom outer side of the rotating inner cylinder (305) form an annular cavity (308). Several misaligned guide plates (309) are fixedly connected to the bottom inner side of the fixed outer cylinder (304). Two adjacent misaligned guide plates (309) form a misaligned guide channel. The side of the rotating inner cylinder (305) is provided with a second hole (3011) corresponding to the misaligned guide channel. The side of the fixed outer cylinder (304) is provided with a first hole (3010) corresponding to the misaligned guide channel.

4. The rice bran oil extraction apparatus according to claim 3, characterized in that: The first partition plate (302) and the second partition plate (307) are each provided with six, forming the first liquid storage chamber to the sixth liquid storage chamber (b1-b6) and the first material storage chamber to the sixth material storage chamber (a1-a6) distributed clockwise. The solvent pumping system (303) includes: five circulating pump groups (3031), a liquid discharge pump group (3032), and a solvent addition pipeline (3033) connected to the second liquid storage chamber (b2). Five circulating pump sets (3031) are installed between the second to sixth liquid storage chambers (b2 to b6) and the second to sixth material storage chambers (a2 to a6), and the discharge pump set (3032) is installed in the first liquid storage chamber (b1). The circulating pump set (3031) includes: a first pump body (30311), a column pipe (30312), and a spray pipe (30313). The column pipe (30312) is fixedly installed at the liquid outlet end of the first pump body (30311), and the spray pipe (30313) is fixedly installed at the top of the column pipe (30312), and the spray pipe (30313) is located above the storage chamber. The discharge pump assembly (3032) includes: a second pump body (30321) and a discharge pipe (30322), with the discharge pipe (30322) installed at the discharge end of the second pump body (30321).

5. The rice bran oil extraction apparatus according to claim 3 or 4, characterized in that, The discharge structure includes: Multiple discharge ports (3012) are opened inside the center cylinder (306) and near the bottom. A baffle cylinder (3013) is fixedly connected to the fixed outer cylinder (304) and located inside the central cylinder (306). The side of the baffle cylinder (3013) is provided with a sliding port corresponding to the discharge port (3012), and an arc-shaped baffle (3015) is slidably installed inside the sliding port. A drive assembly (3014) is fixedly installed at the bottom of the baffle (3013), and the actuating end of the drive assembly (3014) is fixedly connected to the arc-shaped baffle (3015).

6. The rice bran oil extraction apparatus according to claim 5, characterized in that, The driving component (3014) includes: A protective housing (30141) is annular and is fixedly installed on the outside of the central cylinder (306); A threaded rod (30142) is vertically rotatably installed inside the protective housing (30141). A threaded fitting (30144) is threaded onto the threaded rod (30142). A connecting frame (30146) is fixedly connected to the side of the threaded fitting (30144). The connecting frame (30146) is fixedly connected to the arc-shaped baffle (3015). A guide rod (30145) is vertically fixedly installed inside the protective housing (30141), and the threaded fitting (30144) is slidably engaged with the guide rod (30145); A first gear (30143) is fixedly connected to the side of the threaded rod (30142). A gear ring (30149) that meshes with the first gear (30143) is rotatably installed on the inner side of the protective housing (30141). A first motor (30147) is fixedly connected to the inner wall of the protective housing (30141). A second gear (30148) is fixedly installed at the output end of the first motor (30147). The second gear (30148) meshes with the gear ring (30149).

7. The rice bran oil extraction apparatus according to claim 2, characterized in that, The centrifuge assembly (1) includes: A support platform (102) is provided, and a high pole frame (101) is fixedly installed at the bottom of the support platform (102). The support platform (102) is circular, and a central platform (105) is fixedly connected to the center of the support platform (102) through several connecting blocks (107). The first annular shell (103) is fixedly installed on the top of the support platform (102), and the inner wall of the first annular shell (103) is set as a screen part (104). A material drop gap is formed between several connecting blocks (107), and the material drop gap is located on the inner side of the first annular shell (103). Centrifuge disc (106) is rotatably mounted at the top center of central platform (105). A drive motor (109) is fixedly mounted at the bottom of central platform (105). The output end of the drive motor (109) is connected to the centrifuge disc (106) for transmission.

8. The rice bran oil extraction apparatus according to claim 7, characterized in that: The bottom of the support platform (102) is fixedly connected to a double-layer diversion cylinder (108), and the top of the double-layer diversion cylinder (108) corresponds to the material drop gap.

9. The rice bran oil extraction apparatus according to claim 7, characterized in that, The centrifugal disc (106) includes: a base (1062), a central shaft (1061) fixedly connected to the top of the base (1062), an L-shaped plate (1064) fixedly connected to the top of the base (1062) and the side of the central shaft (1061), a plurality of L-shaped plates (1064) are provided, and a feeding area (1065) is formed between two adjacent L-shaped plates (1064), and a connecting shaft (1063) fixedly connected to the bottom of the base (1062), and the connecting shaft (1063) is rotatably connected to the central platform (105).

10. The rice bran oil extraction apparatus according to claim 3, characterized in that, Also includes: The control structure is fixedly disposed above the extraction assembly (3) and is used to control the rotation of the rotating inner cylinder (305).

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