Rice bran oil pressing pretreatment cooking device

Abstract

The invention relates to the technical field of rice bran oil extraction, and discloses a rice bran oil extraction pretreatment cooking device which is characterized in that a conveying pipe is continuously heated and insulated through a heating sleeve, so that high-pressure steam is kept in a damp and hot state in the whole conveying process, rice bran particles are uniformly heated from the outside to the inside, and the subsequent oil extraction rate is guaranteed; and meanwhile, the synergistic effect of the extended tube pass and the spiral conveying blade ensures that each rice bran is cooked for a specified time at a constant temperature, so that the problems of temperature drop and non-uniform cooking caused by transferring after cooking in the prior art are avoided, and the fluctuation of oil yield caused by insufficient preheating is fundamentally eliminated. The problems that in a traditional rice bran oil pressing technology, a steaming-transferring-pressing sectional type treatment mode is obviously insufficient in the aspects of heat energy utilization, production efficiency, safety control, product quality and the like are solved.

Description

Technical Field

[0001] This invention relates to the field of rice bran oil extraction technology, specifically to a rice bran oil extraction pretreatment and cooking device. Background Technology

[0002] Rice bran, a byproduct of rice processing, is rich in oils, proteins, dietary fiber, and various bioactive components, making it a valuable oilseed resource. However, the oils in rice bran do not exist in a free state but are bound by cell wall structures and protein membranes. Specifically, the cell walls of rice bran are mainly composed of cellulose and lignin, forming a dense structure; while the oils are primarily located within the protoplasts and encapsulated by protein membranes. Under normal temperature conditions, the oils are in a "bound state," making direct extraction through mechanical extrusion or solvents difficult.

[0003] To overcome this structural barrier, traditional rice bran oil extraction typically employs a pre-treatment method involving steaming and cooking. Through moist heat treatment (such as steam heating), the proteins in the rice bran denature and coagulate, while the phospholipids absorb water and swell, thereby disrupting the cell wall structure and causing the oil to transition from a "bound" state to a "free" state. This provides a pathway for subsequent solvent penetration or mechanical pressing, increasing the oil yield. This steaming and cooking process is usually carried out in specialized equipment, with the processing time generally controlled at 7–10 minutes and the temperature maintained at approximately 90–105°C.

[0004] However, in existing processes, after cooking, the rice bran, still at a high temperature, needs to be transferred from the cooking equipment to a pressing device for oil extraction. This process presents the following significant problems: 1. Heat loss and low energy efficiency: During the transfer process, hot rice bran is exposed to the environment, and its temperature drops rapidly, resulting in heat loss. This not only reduces the initial temperature conditions for subsequent pressing processes, affecting oil flowability and pressing efficiency, but also increases overall energy consumption, which is not conducive to energy conservation, consumption reduction, and continuous production.

[0005] 2. Discontinuous processes and low production efficiency: Cooking and pressing are two independent processes that need to be carried out step by step. The lack of effective connection between equipment leads to a discontinuous work process. The transfer of materials between different equipment is not only time-consuming, but also increases the complexity of manual intervention and automated control, making it difficult to achieve efficient joint operations and resulting in a long overall production cycle.

[0006] 3. Safety hazards and operational risks: Transferring hot rice bran in an open or semi-open environment poses a risk of burns to operators and threatens production safety.

[0007] 4. Oil oxidation and quality deterioration: High-temperature rice bran has a long contact time with air during the transfer process, which can easily trigger oil oxidation reactions, leading to increased acid value, darker color, and deteriorated flavor, affecting the quality stability and shelf life of the finished oil.

[0008] 5. Complex equipment footprint and layout: Cooking and pressing equipment are usually arranged independently, requiring supporting conveying devices, occupying a large space, and the production line is long, which is not conducive to intensive and modular factory design.

[0009] In summary, while the segmented processing method of "cooking-transfer-pressing" in the traditional rice bran oil extraction process can achieve oil release, it has significant shortcomings in terms of heat energy utilization, production efficiency, safety control, and product quality. There is an urgent need for a new processing technology that can integrate cooking and pressing in a continuous and closed manner to overcome the deficiencies of the existing technology and improve the overall efficiency and industrialization level of the rice bran oil extraction process. Summary of the Invention

[0010] The purpose of this invention is to provide a rice bran oil extraction pretreatment cooking device, which solves the problems of the traditional segmented processing method of "cooking-transfer-pressing" in rice bran oil extraction, which has obvious deficiencies in terms of heat energy utilization, production efficiency, safety control and product quality.

[0011] To achieve the above objectives, the present invention provides the following technical solution: a rice bran oil extraction pretreatment and cooking device, comprising: The conveying mechanism includes a conveying pipe and an internally rotating spiral conveying blade. A feed hopper for feeding rice bran is provided on one side of the conveying pipe. After the rice bran in the feed hopper enters the inside of the conveying pipe, the rotating spiral conveying blade transports the rice bran in the conveying pipe to one side. The pressing mechanism is assembled at one end of the conveying pipe. The pressing mechanism includes a pressing hood and a hydraulic cylinder 1 set on the upper side of the pressing hood. An oil outlet groove is opened on the surface of the pressing hood. A pressure plate is assembled at the output end of the hydraulic cylinder 1. The pressure plate is driven by the hydraulic cylinder 1 to press the rice bran in the pressing hood. The cooking assembly is located on one side of the extrusion hood and connected to one end of the conveying pipe. The cooking assembly includes a feed pipe, one end of which is connected to one end of the conveying pipe. A steaming box is located below the feed pipe. An isolation net is located between the steaming box and the feed pipe. An air supply pipe is located on one side of the steaming box. A door valve is located on one side of the feed pipe. One end of the air supply pipe is connected to an external steam generator.

[0012] As a further description of the above technical solution: a heating sleeve for heating the heating chamber is provided on the outside of the conveying pipe, and a driving part for driving the spiral conveying blade to rotate is provided at one end of the conveying pipe.

[0013] As a further description of the above technical solution: the straight direction of the conveying pipe is at a preset length, so that the transmission time of rice bran in the conveying pipe is - minutes.

[0014] As a further description of the above technical solution: the lower side of the steaming box is provided with a drawer plate, which can be pulled out from the side of the steaming box.

[0015] As a further description of the above technical solution: a feed box is mounted on the upper side of the extrusion cover, the feed pipe is fixedly mounted on one side of the feed box, and the hydraulic cylinder is located on the upper side of the feed box.

[0016] As a further description of the above technical solution: a base is provided on the lower side of the extrusion shroud, and a lifting plate is provided on the upper side of the base. The lifting plate is movable inside the extrusion shroud, and a hydraulic cylinder is provided at the center of the inside of the boss to push the lifting plate to move up and down inside the extrusion shroud. A cake-pushing assembly is provided on the side of the feeding box. The cake-pushing assembly includes a push plate disposed inside the feeding box. A push rod is connected to one side of the push plate. The push rod extends movably to the outer surface of the feeding box. An electric cylinder for pushing the push rod is provided on the outside of the feeding box.

[0017] As a further description of the above technical solution: the upper side of the base is provided with a boss, and the lower surface of the lifting plate is provided with a groove that fits and engages with the boss.

[0018] As a further description of the above technical solution: an isolation net is also provided inside the extrusion cover, and the isolation net is detachably assembled inside the extrusion cover.

[0019] As a further description of the above technical solution: the outer surface of the extrusion cover is also provided with a guide cover, and a trough is provided on one side of the guide cover. The preset height of the guide cover is lower than the height of the oil outlet groove on the surface of the extrusion cover.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The conveying pipe is continuously heated and kept warm by a heating jacket, so that the high-pressure steam remains in a humid and hot state throughout the conveying process. The rice bran particles are heated evenly from the surface to the inside, thus ensuring the oil yield during subsequent pressing. At the same time, the extension of the pipe and the synergistic effect of the spiral conveyor blades ensure that each grain of rice bran completes the specified steaming time at a constant temperature, avoiding the temperature drop and uneven steaming problems caused by traditional steaming before transfer, and fundamentally eliminating the fluctuation in oil yield caused by insufficient preheating.

[0021] 2. The extrusion hood, lifting plate, and hydraulic cylinder form a bottom-lifting cake discharge mechanism. During oil pressing, the lifting plate and the hydraulic cylinder form a closed pressing chamber, ensuring that the high-pressure oil flows out only through the isolation screen. After pressing, the lifting plate lifts the rice bran cake to the feeding box, and then pushes it out horizontally in one go. There is no need for manual cake removal throughout the process, which not only eliminates the risk of high temperature burns, but also avoids oil oxidation caused by open cleaning, greatly improving the safety of operation and the stability of finished oil quality. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cooking component structure of the present invention; Figure 3 This is a schematic diagram of the structure of the cake-pushing component of the present invention; Figure 4 This is a schematic diagram of the cooking assembly of the present invention; Figure 5 This is a schematic diagram showing the state in which the extraction plate of the cooking assembly of the present invention is pulled out. Figure 6 This is a schematic diagram of the disassembled structure of the pressing mechanism of the present invention; Figure 7 This is a schematic diagram of the conveying mechanism of the present invention.

[0023] In the diagram: 10. Conveying mechanism; 11. Conveying pipe; 12. Screw conveyor blade; 13. Feed hopper; 14. Drive unit; 15. Heating jacket; 20. Pressing mechanism; 21. Extrusion cover; 211. Isolation net one; 22. Guide cover; 23. Feed box; 24. Hydraulic cylinder one; 25. Base; 251. Lifting plate; 252. Hydraulic cylinder two; 253. Boss; 26. Cake pushing assembly; 261. Push plate; 262. Push rod; 263. Electric cylinder; 30. Cooking assembly; 31. Feed pipe; 32. Steaming box; 321. Draw plate; 33. Air supply pipe; 34. Isolation net two; 35. Door valve. Detailed Implementation

[0024] 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.

[0025] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings.

[0026] Combination Figures 1-7 A rice bran oil extraction pretreatment and cooking device, comprising: The conveying mechanism 10 includes a conveying pipe 11 and a spiral conveying blade 12 internally rotated. A feeding hopper 13 for feeding rice bran is provided on one side of the conveying pipe 11. The rice bran fed into the feeding hopper 13 will naturally leak into the conveying pipe 11. After the rice bran in the feeding hopper 13 enters the inside of the conveying pipe 11, the rotating spiral conveying blade 12 will transport the rice bran in the conveying pipe 11 to one side. The pressing mechanism 20 is assembled at one end of the conveying pipe 11. The pressing mechanism 20 includes a pressing cover 21 and a hydraulic cylinder 24 disposed on the upper side of the pressing cover 21. An oil outlet groove is opened on the surface of the pressing cover 21. A pressure plate is assembled at the output end of the hydraulic cylinder 24. The pressure plate is driven by the hydraulic cylinder 24 to press the rice bran inside the pressing cover 21. When the rice bran is pressed, the oil inside is squeezed out and then flows to the outer surface of the pressing cover 21 through the oil outlet groove. The cooking assembly 30 is located on one side of the extrusion hood 21 and connected to one end of the conveying pipe 11. The rice bran transported inside the conveying pipe 11 passes through the extrusion hood 21 and is then conveyed to the inside of the extrusion hood 21. The cooking assembly 30 includes an inlet pipe 31, one end of which is connected to one end of the conveying pipe 11. A steaming box 32 is located below the inlet pipe 31. An isolation mesh 34 is located between the steaming box 32 and the inlet pipe 31. The aperture of the isolation mesh 34 is smaller than the particle diameter of the rice bran. An air supply pipe 33 is located on one side of the steaming box 32, and a door valve 35 is located on one side of the inlet pipe 31. One end of the air supply pipe 33 is connected to an external steam generator. The steam generator produces high-pressure steam, which is injected into the inside of the steaming box 32 through the air supply pipe 33 and then enters the inlet pipe 31 through the isolation mesh 34. The steam generator is existing technology, and its working principle will not be described in detail.

[0027] Specifically, the conveying pipe 11 is filled with rice bran, and the rice bran particles are generally large, ranging from one to two millimeters in diameter. High-pressure steam generated by the steam generator is then injected into the feed pipe 31. The gate valve 35 at one end of the feed pipe 31 is normally closed. The steam injected into the feed pipe 31 automatically diffuses into the conveying pipe 11 and flows through the gaps between the rice bran particles inside the conveying pipe 11. The flowing steam preheats the rice bran in the conveying pipe 11. After the rice bran in the conveying pipe 11 has been preheated for a preset time, the gate valve 35 is opened, and the screw conveyor blade 12 is started to rotate, so that the preheated rice bran is injected into the extrusion hood 21 for oil pressing.

[0028] Combination Figure 1 and Figure 7 The outer side of the conveying pipe 11 is provided with a heating sleeve 15 for heating the chamber. One end of the conveying pipe 11 is provided with a driving part 14 for driving the spiral conveying blade 12 to rotate. Since the pipe body of the conveying mechanism 10 is long, the temperature drops quickly after the steam flows inside, and the preheating effect on the rice bran in the rear section of the conveying pipe 11 deteriorates. Therefore, the heating sleeve 15 is used to heat and keep the conveying pipe 11 warm so that the rice bran in the conveying pipe 11 can receive a uniform preheating effect.

[0029] Furthermore, the straight direction of the conveying pipe 11 is at a preset length, so that the transmission time of rice bran in the conveying pipe 11 is 7-10 minutes. By presetting the length of the conveying pipe 11, it is ensured that the rice bran conveyed from the conveying pipe 11 can be preheated to the preset time.

[0030] Combination Figures 4-5 The steaming box 32 is provided with a drawer plate 321 on the lower side. The drawer plate 321 can be pulled out from the side of the steaming box 32. Even if the aperture of the isolation net 34 is preset to be smaller than the particle diameter of rice bran, a small amount of powder will inevitably leak out into the steaming box 32 through the isolation net 34. Due to the design of the steaming box 32 being located below the feed pipe 31, the rice bran powder leaking out from the isolation net 34 will accumulate on the drawer plate 321. This does not affect the effect of the air supply pipe 33 injecting steam into the steaming box 32 and then entering the feed pipe 31 through the isolation net 34. The rice bran powder accumulated on the drawer plate 321 can be cleaned by pulling out the drawer plate 321 during subsequent maintenance.

[0031] Combination Figures 2-6 The upper side of the extrusion cover 21 is equipped with a feeding box 23, and the feeding pipe 31 is fixedly installed on one side of the feeding box 23. The hydraulic cylinder 24 is set on the upper side of the feeding box 23. When the preheated rice bran is injected into the inner side of the extrusion cover 21 through the feeding pipe 31, the pressure plate at the output end of the hydraulic cylinder 24 will be set on the upper side of the feeding box 23 to prevent the rice bran from entering the extrusion cover 21.

[0032] A base 25 is provided on the lower side of the extrusion cover 21, and a lifting plate 251 is provided on the upper side of the base 25. The lifting plate 251 is movable inside the extrusion cover 21. A hydraulic cylinder 252 is provided at the center of the protrusion 253 to push the lifting plate 251 up and down inside the extrusion cover 21. When the hydraulic cylinder 24 is performing oil pressing, the lifting plate 251 is located at the bottom of the inner side of the extrusion cover 21. The lifting plate 251 cooperates with the pressure plate at the output end of the hydraulic cylinder 24 to press the rice bran, thereby performing oil pressing. After the oil pressing is completed, the hydraulic cylinder 252 pushes the lifting plate 251 to move the rice bran cake produced after oil pressing inside the extrusion cover 21 upward.

[0033] A cake-pushing assembly 26 is provided on the side of the feeding box 23. The cake-pushing assembly 26 includes a push plate 261 disposed inside the feeding box 23. A push rod 262 is connected to one side of the push plate 261. The push rod 262 extends movably to the outer surface of the feeding box 23. An electric cylinder 263 is provided on the outside of the feeding box 23 for pushing the push rod 262. When the lifting plate 251 pushes the rice bran cake upward to the inside of the feeding box 23, the electric cylinder 263 pushes the push rod 262, causing the push plate 261 to push the rice bran cake out from one side of the feeding box 23, thereby cleaning the rice bran cake.

[0034] The base 25 is provided with a boss 253 on the upper side, and the lower surface of the lifting plate 251 is provided with a groove that fits and matches the boss 253. The boss 253 can prevent the oil produced during the oil pressing process from entering the inside of the base 25, causing oil residue inside, which is difficult to clean and may affect the normal operation of the hydraulic cylinder 252.

[0035] Combination Figures 5-6 The inner side of the extrusion cover 21 is also provided with an isolation net 211. The isolation net 211 is detachably assembled on the inner side of the extrusion cover 21. For example, the isolation net 211 is fastened to the inner side of the extrusion cover 21 by bolts. When the bolts are loosened, the isolation net 211 can be removed from the inner side of the extrusion cover 21. Specifically, during the process of pressing rice bran to extract oil, it is also necessary to prevent some rice bran from mixing into the oil. Therefore, the mesh opening of the isolation net 211 needs to be smaller than the particle diameter of the rice bran. However, the small aperture will make subsequent cleaning difficult. Therefore, the isolation net 211 is designed to be detachable, making it easy to remove and clean.

[0036] The outer surface of the extrusion cover 21 is also provided with a guide cover 22. The guide cover 22 has a trough on one side. The guide cover 22 is preset to be lower than the height of the oil outlet groove on the surface of the extrusion cover 21. When the grease is squeezed out from the inside of the extrusion cover 21, it will leak into the inside of the guide cover 22 and then be discharged from the trough on one side, which is convenient for subsequent collection of the grease.

[0037] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A rice bran oil extraction pretreatment and cooking device, characterized in that, Include: Conveying mechanism (10), including conveying pipe (11) and internal rotation of the screw conveying leaf (12), conveying pipe (11) one side is equipped with for putting rice bran feeding hopper (13), the rice bran in feeding hopper (13) enters the inside of conveying pipe (11) after, the rotating screw conveying leaf (12) will be conveyed in the conveying pipe (11) rice bran to one side transmission; Pressing mechanism (20) is assembled in conveying pipe (11) one end, pressing mechanism (20) includes extrusion cover (21) and the hydraulic cylinder one (24) arranged on extrusion cover (21) upper side, the surface of extrusion cover (21) is provided with oil groove, the output end of hydraulic cylinder one (24) is equipped with pressing plate, the pressing plate is driven extrusion cover (21) in extrusion cover (21) by hydraulic cylinder one (24), rice bran; Cooking assembly (30) is arranged on one side of extrusion cover (21) and is connected with one end of conveying pipe (11), the cooking assembly (30) includes feeding pipe (31), one end of the feeding pipe (31) is butted with one end of the conveying pipe (11), the lower side of the feeding pipe (31) is provided with a steaming box (32), the steaming box (32) is provided with a second isolation net (34) in the middle of the feeding pipe (31), the side of the steaming box (32) is provided with a gas supply pipe (33), the side of the feeding pipe (31) is provided with a door plate valve (35), one end of the gas supply pipe (33) is connected with an external steam generator.

2. The rice bran oil expelling and pre-treating steaming device according to claim 1, characterized in that: The outer side of the conveying pipe (11) is provided with a heating sleeve (15) for heating the cavity, and one end of the conveying pipe (11) is provided with a driving part (14) for driving the rotation of the screw conveying leaf (12).

3. The rice bran oil expelling and pre-treating steaming device according to claim 1, characterized in that: The straight direction of the conveying pipe (11) is of a preset length, so that the transmission time of rice bran in the conveying pipe (11) is 7-10 minutes.

4. The rice bran oil expelling and pre-treating steaming device according to claim 1, wherein: The lower side of the steaming box (32) is provided with a pull-out plate (321), which can be pulled out from the side of the steaming box (32).

5. The rice bran oil expelling and pre-treating steaming device according to claim 1, wherein: The upper side of the extrusion cover (21) is equipped with a feeding box (23), the feeding pipe (31) is fixedly arranged on one side of the feeding box (23), and the hydraulic cylinder one (24) is arranged on the upper side of the feeding box (23).

6. The rice bran oil expelling and pre-treating steaming device according to claim 5, wherein: The lower side of the extrusion cover (21) is provided with a base (25), the upper side of the base (25) is provided with a lifting plate (251), the lifting plate (251) is movably arranged inside the extrusion cover (21), the inner center of the boss (253) is provided with a hydraulic cylinder two (252) for driving the lifting plate (251) to move up and down inside the extrusion cover (21); The side of the feeding box (23) is provided with a cake pushing assembly (26), the cake pushing assembly (26) includes a push plate (261) arranged inside the feeding box (23), one side of the push plate (261) is connected with a push rod (262), the push rod (262) is movably arranged to the outer surface of the feeding box (23), and the outer side of the feeding box (23) is provided with an electric cylinder (263) for pushing the push rod (262).

7. The rice bran oil expelling and pre-treating steaming device according to claim 6, characterized in that: The upper side of the base (25) is provided with a boss (253), and the lower surface of the lifting plate (251) is provided with a groove matched with the boss (253).

8. The rice bran oil expelling and pre-treating steaming device according to claim 1, wherein: The inside of the extrusion cover (21) is also provided with a separation net (211), which is detachably assembled on the inside of the extrusion cover (21).

9. The rice bran oil expelling and pre-treating steaming device according to claim 1, wherein: The outer surface of the extrusion cover (21) is also provided with a guide cover (22), which is provided with a trough on one side, and the preset height of the guide cover (22) is lower than the height of the oil outlet groove of the surface of the extrusion cover (21).

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