Peanut oil extraction process

Abstract

The invention relates to the technical field of vegetable oil extraction, in particular to a peanut oil extraction process, the process uses a smooth charcoal treatment device, the smooth charcoal treatment device comprises a primary cylinder, a secondary cylinder and a stirrer, a heating assembly is arranged in the primary cylinder and used for heating peanut oil entering the primary cylinder to the temperature, and buffer mechanisms are arranged in the primary cylinder and the secondary cylinder and used for buffering the peanut oil entering the secondary cylinder. The peanut oil in the first-stage barrel is slowly discharged to the second-stage barrel, the purification efficiency of the activated carbon on the peanut oil is improved, aflatoxin in crude oil is purified through the activated carbon, the heating pipe is arranged in the clamping cavity of the first-stage barrel, the crude oil and the activated carbon are fully dissolved and mixed in the first-stage barrel, the purification efficiency of the activated carbon on the crude oil is improved, and the aflatoxin in the crude oil is purified. The dissolving efficiency of the crude oil and the activated carbon is further improved. When the pressing seat moves, crude oil in the first-stage cylinder is pressed into the second-stage cylinder for further purification, so that aflatoxin in finished oil is greatly reduced, and the oil quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of vegetable oil extraction, in particular to a peanut oil extraction process. Background Art

[0002] Peanut oil extraction primarily involves two main processes: pressing and leaching. Modern technology is also optimizing traditional methods to improve oil yield and quality. Pressing uses mechanical pressure to crush peanuts and squeeze out the oil, preserving their natural flavor. This method requires a series of processes, including sorting, frying, shelling, and de-shelling. Peanuts are shelled and then passed through a sorting machine to remove impurities and defective peanuts. The peanuts are then fried in a wok and de-shelled using a de-shelling machine. Finally, the oil is extracted using a press. Peanut oil often contains aflatoxin, a potent carcinogen that affects its quality. Removing aflatoxin is a key step in peanut oil extraction.

[0003] Based on the above-mentioned activated carbon's porous structure, it has strong adsorption properties and can physically adsorb toxin molecules. Its adsorption efficiency for non-polar substances (such as aflatoxin) is as high as 40-60%. Directly adding activated carbon into peanut oil will not only fail to treat aflatoxin, but the activated carbon will also condense in a short time and cannot be dissolved in peanut oil in a short time. Therefore, how to apply activated carbon to peanut oil extraction to improve the quality of oil is a problem to be solved in the current peanut oil extraction process. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a peanut oil extraction process using an activated carbon treatment device. The activated carbon treatment device includes a primary cylinder and a secondary cylinder. The primary cylinder and the secondary cylinder are both provided with an agitator. The primary cylinder is provided with a heating component for heating the peanut oil entering the primary cylinder to a temperature of 10000 °C. The primary cylinder and the secondary cylinder are provided with a buffer mechanism to slowly discharge the peanut oil in the primary cylinder into the secondary cylinder, thereby improving the purification efficiency of the activated carbon on the peanut oil. The peanut oil extraction process using the above activated carbon treatment device includes the following steps: Step s01, connecting a press to the feed side of the first-stage drum, connecting a separator to the feed side of the press, connecting a wok to the feed side of the separator, connecting a screen between the wok and the separator, and connecting a filter to the discharge side of the first-stage drum; Step s02: Fry the peanuts in a wok, place them in a sorting machine for sorting, remove the red skins through a sieve, and place the kernels in a press to produce peanut oil; Step s03: The peanut oil enters the activated carbon treatment device and is purified by the primary and secondary cylinders and then filtered by the filter device to obtain the finished product and fill it.

[0005] As a further preferred embodiment, the inner walls of the barrel cavities of the secondary barrel and the primary barrel are smoothly connected, the buffer mechanism includes a buffer plate arranged in the primary barrel and the secondary barrel, the agitator passes through the buffer plate, the buffer mechanism also includes a pressure seat connected to the right end face of the buffer plate and located in the secondary barrel, the buffer mechanism also includes a connecting rod fixed on the agitator, the two ends of the connecting rod extend to both sides of the agitator and pressure wheels are installed at both ends of the connecting rod, two involute tracks are provided at one end of the pressure seat facing the pressure wheel, the two pressure wheels roll on the involute tracks, a large number of fine holes are opened on the buffer plate, the left and right ends of the fine holes are connected to the inner cavity of the primary barrel and the secondary barrel, the fine holes are tapered holes that gradually become thinner toward the direction of the primary barrel, a connecting frame is fixed in the secondary barrel, a telescopic rod is connected between the connecting frame and the right end face of the pressure seat, the agitator rotates with the connecting rod, and the connecting rod drives the two pressure wheels to rotate along the involute track, pushing the pressure seat through the involute track, and under the rebound action of the telescopic rod, the pressure seat moves left and right in the secondary barrel and the primary barrel.

[0006] As a further preference, a conical seat is provided on the left end face of the buffer plate, the conical seat is located in the first-stage cylinder and its taper gradually becomes thinner to the left, the agitator passes through the conical seat, and no fine holes are opened on the portion of the buffer plate where the conical seat is installed, and the fine holes are only opened on the buffer plate near the periphery of the conical seat.

[0007] As a further preferred embodiment, a liquid flow hole communicating with the left and right sides is opened on the connecting rod, and the pressure wheel is installed on the end of the connecting rod and away from the liquid flow hole.

[0008] As a further preference, a clamping cavity is provided on the first-stage cylinder, and the heating assembly includes a heating tube filled in the clamping cavity and a heating hole opened between the first-stage cylinder cavity and the clamping cavity.

[0009] As a further preference, the heating holes are at two places on the left and right, and the first tube is provided with a first tube for injecting peanut oil and a second tube for injecting activated carbon. The first tube and the second tube are distributed on the left and right and are respectively located in the two heating holes. The part of the agitator located in the first tube is provided with a first-level stirring blade. The first tube is located on the left and the inner end enters the first tube, and the inner end of the second tube enters the first tube and is located above the first-level stirring blade.

[0010] As a further preference, the second tube is tapered, and its inner end gradually becomes thinner toward the primary stirring blade.

[0011] As a further preference, the portion of the agitator entering the secondary cylinder is provided with a secondary agitating blade.

[0012] The beneficial effects of the present invention compared to the prior art are: 1. An activated carbon treatment device is set up in the subsequent process of pressing. The activated carbon treatment device consists of a first-level cylinder and a second-level cylinder connected together. A buffer plate is set between the two cylinders. The crude oil enters the first-level cylinder from the press. Food-grade activated carbon is selected and injected into the first-level cylinder to mix with the crude oil. A stirrer is set up in the first and second cylinders. The stirrer with a first-level stirring blade fully mixes the crude oil and the activated carbon. The aflatoxin in the crude oil is purified by the activated carbon. A heating tube is set up in the clamping cavity of the first cylinder. At the same time, the heating tube heats up, so that the crude oil and activated carbon are fully dissolved and mixed in the first cylinder, thereby improving the purification efficiency of the activated carbon on the crude oil. 2. The buffer plate acts as a barrier, and the slow flow of crude oil allows it to remain in the primary barrel for a longer time. This also limits the volume of the primary barrel, accelerating the heating and dissolution of the crude oil and activated carbon within a smaller volume, further improving purification efficiency. The buffer plate features numerous tiny pores, and a pressure seat with an involute trajectory is located on its right end. As the agitator rotates with the pressure wheel, it drives the pressure seat to move, reducing the volume of the primary barrel. Once the primary barrel cavity is reduced, the crude oil in the cavity flows radially. Combined with the stirring action of the primary agitator blades, this further improves the dissolution efficiency of the crude oil and activated carbon. As the pressure seat moves, it presses the crude oil from the primary barrel into the secondary barrel, further purifying it. This significantly reduces aflatoxin in the finished oil, improving oil quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the external structure of an activated carbon treatment device in a peanut oil extraction process provided by an embodiment of the present invention; Figure 2 The activated carbon treatment device in the peanut oil extraction process provided by the embodiment of the present invention is composed of Figure 1 Schematic diagram of the end face structure; Figure 3 The activated carbon treatment device in the peanut oil extraction process provided by the embodiment of the present invention is composed of Figure 2 The main plan view of section A after sectioning is shown; Figure 4 The activated carbon treatment device in the peanut oil extraction process provided by the embodiment of the present invention is composed of Figure 3 The enlarged schematic diagram of part B is shown; Figure 5 A schematic diagram of a disassembled activated carbon treatment device in a peanut oil extraction process provided by an embodiment of the present invention after being cut open and viewed from a three-dimensional perspective; Figure 6 A schematic diagram of the three-dimensional structure of a cutaway activated carbon treatment device in a peanut oil extraction process provided by an embodiment of the present invention; Figure 7 The activated carbon treatment device in the peanut oil extraction process provided by the embodiment of the present invention is composed of Figure 6 The enlarged schematic diagram of the C part is shown; Figure 8 This is a process flow chart of a peanut oil extraction process provided in an embodiment of the present invention, see the description of step S01.

[0014] In the figure: 1. Primary cylinder; 2. Secondary cylinder; 3. Agitator; 31. Primary stirring blade; 32. Secondary stirring blade; 4. Heating assembly; 41. Heating tube; 42. Heating hole; 5. Buffer mechanism; 51. Buffer plate; 52. Press seat; 53. Connecting rod; 54. Press wheel; 55. Involute trajectory; 56. Fine hole; 57. Conical seat; 58. Liquid flow hole; 6. First tube; 7. Second tube; 8. Telescopic rod; 9. Clamping cavity. DETAILED DESCRIPTION

[0015] The above and other embodiments and advantages of the present invention are clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments.

[0016] In one embodiment, Figures 1-8 As shown: This embodiment provides a peanut oil extraction process, using an activated carbon treatment device, the activated carbon treatment device includes a primary cylinder 1 and a secondary cylinder 2, the primary cylinder 1 and the secondary cylinder 2 are both provided with a stirrer 3, the primary cylinder 1 is provided with a heating component 4, which is used to heat the peanut oil entering the primary cylinder 1 to 60 degrees, and the primary cylinder 1 and the secondary cylinder 2 are provided with a buffer mechanism 5, so that the peanut oil in the primary cylinder 1 is slowly discharged to the secondary cylinder 2, thereby improving the purification efficiency of the activated carbon on the peanut oil. The heating holes 42 are located on the left and right, and the primary cylinder 1 is provided with a heating hole 42 for injecting peanut oil. The first tube 6 and the second tube 7 for injecting activated carbon are respectively located in the two heating holes 42 in a left-right distribution manner. The portion of the agitator 3 located in the primary cylinder 1 is provided with a primary stirring blade 31. The first tube 6 is located on the left side and its inner end enters the primary cylinder 1. The inner end of the second tube 7 enters the primary cylinder 1 and is located above the primary stirring blade 31. As a further preferred embodiment, a clamping cavity 9 is provided on the primary cylinder 1. The heating assembly 4 includes a heating tube 41 filled in the clamping cavity 9 and a heating hole 42 opened between the cylinder cavity of the primary cylinder 1 and the clamping cavity 9. The inner walls of the cylinder cavities of the secondary cylinder 2 and the primary cylinder 1 are smoothly connected. The buffer mechanism 5 includes a buffer plate 51 provided in the primary cylinder 1 and the secondary cylinder 2. When the buffer plate 51 moves to the left, it enters the primary cylinder 1 and can reduce the volume of the primary cylinder 1. When the buffer plate 51 moves to the right, it enters the secondary cylinder 2 and increases the volume of the primary cylinder 1. The agitator 3 passes through the buffer plate 51, and the buffer mechanism 5 also includes a pressure seat 52 connected to the right end surface of the buffer plate 51 and located in the secondary cylinder 2. The buffer mechanism 5 also includes a connecting rod 53 fixed to the agitator 3. The two ends of the connecting rod 53 extend to both sides of the agitator 3 and pressure wheels 54 are installed at both ends of the connecting rod 53. The end of the pressure seat 52 facing the pressure wheel 54 is provided with two involute tracks 55. The two pressure wheels 54 roll on the involute tracks 55. A large number of fine holes 56 are opened on the buffer plate 51. The left and right sides of the fine holes 56 are provided. The right two ends are connected with the inner cavity of the primary cylinder 1 and the secondary cylinder 2. A connecting frame is fixed in the secondary cylinder 2. A telescopic rod 8 is connected between the connecting frame and the right end face of the pressure seat 52. When the agitator 3 rotates with the connecting rod 53, and the connecting rod 53 drives the two pressure wheels 54 to rotate along the involute trajectory 55, the pressure seat 52 is pushed by the involute trajectory 55, and under the rebound action of the telescopic rod 8, the pressure seat 52 moves left and right in the secondary cylinder 2 and the primary cylinder 1. The part of the agitator 3 that enters the secondary cylinder 2 is provided with a secondary stirring blade 32.

[0017] Working principle and effect: The press obtains crude oil after squeezing the oil. The crude oil enters the first barrel 1 through the first tube 6. Food-grade activated carbon (in accordance with GB1886.228-2016 standard, powdered 200-400 mesh) is selected and enters the first barrel 1 through the second tube 7 to be mixed with the crude oil. The stirrer 3 rotates with the first stirring blade 31 (60-100rpm) to fully mix the crude oil and the activated carbon. The aflatoxin in the crude oil is purified by the activated carbon. At the same time, the heating tube 41 heats up, firstly raising the temperature of the clamping cavity 9, and then gradually raising the temperature in the first barrel 1 through heat transfer. When the crude oil is injected into the first barrel 1 through the first tube 6, it will be preheated in the clamping cavity 9 before entering. When the activated carbon is injected into the first-stage barrel 1 through the second tube 7, it will also be heated in advance through the clamping cavity 9 before entering the first-stage barrel 1 for heating. With the stirring action of the first-stage stirring blade 31, the crude oil and the activated carbon are fully dissolved and mixed in the first-stage barrel 1, and are fully heated. The heating assists in improving the purification efficiency of the activated carbon on the crude oil. A buffer plate 51 is provided between the first-stage barrel 1 and the second-stage barrel 2. The buffer plate 51 has a blocking effect. In addition, the crude oil flows slowly, so that the crude oil can stay in the first-stage barrel 1 for a longer time. At the same time, the buffer plate 51 blocks the volume of the first-stage barrel 1, so that the crude oil and the activated carbon are heated and dissolved faster in a smaller volume, further improving the purification efficiency.

[0018] The buffer plate 51 is provided with many tiny holes 56, and a pressure seat 52 with an involute track 55 is provided on the right end surface of the buffer plate 51. When the agitator 3 rotates, it will drive the connecting rod 53 to rotate, and the connecting rod 53 drives the pressure wheel 54 to roll and rotate along the involute track 55. When the pressure wheel 54 rolls to the peak position of the involute track 55, it will push the pressure seat 52 to move left, and the telescopic rod 8 (which can be understood as a spring seat) is compressed and shortened, and the pressure seat 52 pushes the buffer plate 51 to move left, so that the volume of the first-stage cylinder 1 becomes smaller. Once the volume of the first-stage cylinder 1 becomes smaller, the crude oil in the volume will flow radially, and the stirring effect of the first-stage stirring blade 31 will further improve the dissolution efficiency of the crude oil and the activated carbon. Secondly, the buffer plate 51 is thicker and has a larger diameter. These fine holes 56 on the surface are tapered holes that gradually taper toward the volume of the first-stage cylinder 1. In addition, the crude oil has poor natural fluidity. Without external force, it will not flow from the left end (thin end) of the fine hole 56 from the first-stage cylinder 1 to the second-stage cylinder 2. Only when the buffer plate 51 is pushed leftward, the squeezing effect formed by the shrinkage of the volume of the first-stage cylinder 1 causes the crude oil to flow from the first-stage cylinder 1 to the second-stage cylinder 2 through the fine hole 56. The leftward movement of the pressure seat 52 is small, and a small amount of crude oil enters the first-stage cylinder 1. The pressure wheel 54 will soon roll to the low peak position of the involute trajectory 55. The pressure seat 52 will quickly return to the right under the rebound effect of the telescopic rod 8. The pressure in the first-stage cylinder 1 is restored, and the crude oil no longer enters the second-stage cylinder 2. It is still heated and dissolved under the stirring of the first-stage stirring blade 31. When the pressure roller 54 reaches the peak of the involute trajectory 55 again, it presses a small amount of crude oil from the primary drum 1 into the secondary drum 2. Even after the crude oil enters the secondary drum 2, it is stirred and mixed a second time by the secondary stirring blades 32, causing the activated carbon and crude oil to dissolve a second time in the secondary drum 2, further purifying the aflatoxin in the crude oil. A discharge pipe with a solenoid valve is located at the right end of the secondary drum 2. The crude oil continuously flows into the secondary drum 2, and the solenoid valve remains closed. Only when the crude oil level in the secondary drum 2 exceeds a set time, for example, 20-30 minutes, does the solenoid valve automatically open. The secondary purified crude oil is discharged into the purification device, where it is filtered by the activated carbon particles to produce the finished oil. The aflatoxin content in the finished oil is significantly reduced. The oil also absorbs pigments (such as chlorophyll and carotenoids) in the oil, making it clearer and brighter. It also removes volatile odorous substances such as aldehydes produced by oxidation, improving its quality.

[0019] In another embodiment, the second tube 7 is conical, and its inner end gradually tapers toward the primary stirring blade 31, and the inner end of the second tube 7 is located in the peripheral direction of the primary stirring blade 31. When the activated carbon powder is added to the primary cylinder 1 through the second tube 7, the conical structure is used to reduce the flow velocity, and the feeding direction is also located in the rotation range of the primary stirring blade 31. When the primary stirring blade 31 rotates, in addition to mixing the activated carbon powder with the crude oil, the activated carbon powder has no chance of condensation when injected into the crude oil, and the activated carbon powder can be quickly dissolved when added to the crude oil.

[0020] In another embodiment, Figures 3 to 7 As shown, a conical seat 57 is provided on the left end surface of the buffer plate 51. The conical seat 57 is located within the primary barrel 1 and tapers gradually to the left. The agitator 3 passes through the conical seat 57. The portion of the buffer plate 51 where the conical seat 57 is mounted does not have fine holes 56. Fine holes 56 are only provided on the buffer plate 51 around the periphery of the conical seat 57. When the buffer plate 51 moves leftward, it moves the conical seat 57 leftward. This not only reduces the volume of the primary barrel 1 and generates pressure, allowing the crude oil to enter the secondary barrel 2, but also utilizes the leftward movement of the conical seat 57 to further diffuse the crude oil radially, bringing it closer to the heating zone and improving heating efficiency. Simultaneously, the conical surface pushes the crude oil into the fine holes 56, allowing the heated crude oil and activated carbon powder mixture to enter the secondary barrel 2 from the primary barrel 1, completing the secondary mixing.

[0021] In another embodiment, Figure 7 As shown, connecting rod 53 is provided with a fluid flow hole 58 that communicates left and right. A pressure roller 54 is mounted at the end of connecting rod 53, away from fluid flow hole 58. Connecting rod 53 is not only used to mount pressure roller 54, but also functions as a stirrer when rotating with stirrer 3. The provision of fluid flow holes 58 on connecting rod 53 not only ensures sufficient strength but also allows the crude oil to flow left and right during stirring within primary cylinder 1.

[0022] The process for extracting peanut oil by the activated carbon treatment device comprises the following steps: Step s01, connecting a press to the feed side of the first-stage drum 1, connecting a separator to the feed side of the press, connecting a wok to the feed side of the separator, connecting a screen between the wok and the separator, and connecting a filter to the discharge side of the first-stage drum 1; Step s02: The peanuts are fried in a wok, and then sent to a sorting machine for screening. At the same time, the peanuts are passed through a red peel removal device, and the red peel on the peanuts is removed by vibration and discharged onto a vibrating screen. The peanuts are then sent to a container for collection, and the kernels are then sent to a press to produce crude peanut oil. Step s03, the crude peanut oil enters the activated carbon treatment device and is purified by the first-level cylinder 1 and the second-level cylinder 2 and then filtered by the filtering device. 5g of activated carbon is added to every 1kg of crude peanut oil. After mixing and stirring by the first-level cylinder 1 and the second-level cylinder 2, the chloropenicillin is removed. The peanut oil enters the filtering device to remove activated carbon impurities, and the finished oil is obtained and filled by the filling equipment. According to the activated carbon use process, the use of activated carbon alone is prone to excessive adsorption of oil and fat, and the loss rate is as high as 3-5%. Therefore, the selected activated carbon in the process needs to be mixed with white clay in a ratio of 1 to 3 in advance and then put into the first-level cylinder 1 for use. Before the finished oil enters the filtering device, the activated carbon particles are separated from the crude oil by plate and frame, centrifugal separation or filter paper filtration to finally obtain the finished oil and improve the purity.

[0023] The above orientation designations do not represent the specific orientations of the components in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme, and the orientations are described relatively with reference to the figures. In essence, the specific orientations of the components are described based on their actual installation and actual use, as well as the customary orientations of those skilled in the art. This is hereby explained.

[0024] The specific embodiments described above further illustrate the purpose of the present invention, technical solutions, and beneficial effects. It should be understood that the above description is merely a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. In particular, it should be noted that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A peanut oil extraction process, characterized in that: An activated carbon treatment device is used, which includes a primary cylinder (1) and a secondary cylinder (2). The primary cylinder (1) and the secondary cylinder (2) are both provided with a stirrer (3). The primary cylinder (1) is provided with a heating component (4) for heating the peanut oil entering the primary cylinder (1) to 60 degrees. The primary cylinder (1) and the secondary cylinder (2) are provided with a buffer mechanism (5) so that the peanut oil in the primary cylinder (1) is slowly discharged to the secondary cylinder (2), thereby improving the purification efficiency of the activated carbon on the peanut oil. The peanut oil extraction process using the above-mentioned activated carbon treatment device includes the following steps: Step s01, connecting a press to the feed side of the first-stage cylinder (1), connecting a separator to the feed side of the press, connecting a wok to the feed side of the separator, connecting a screen between the wok and the separator, and connecting a filter to the discharge side of the first-stage cylinder (1); Step s02: Fry the peanuts in a wok, place them in a sorting machine for sorting, remove the red skins through a sieve, and place the kernels in a press to produce peanut oil. Step s03: The peanut oil enters the activated carbon treatment device, is purified by the first cylinder (1) and the second cylinder (2), and then is filtered by the filtering device to obtain the finished product and fill it.

2. A peanut oil extraction process according to claim 1, characterized in that, The inner walls of the cylinder cavities of the secondary cylinder (2) and the primary cylinder (1) are smoothly connected. The buffer mechanism (5) includes a buffer plate (51) arranged in the primary cylinder (1) and the secondary cylinder (2). The agitator (3) passes through the buffer plate (51). The buffer mechanism (5) also includes a pressure seat (52) connected to the right end face of the buffer plate (51) and located in the secondary cylinder (2). The buffer mechanism (5) also includes a connecting rod (53) fixed on the agitator (3). The two ends of the connecting rod (53) extend to both sides of the agitator (3) and pressure wheels (54) are installed at both ends of the connecting rod (53). Two involute tracks (55) are provided on one end of the pressure seat (52) facing the pressure wheel (54). The two pressure wheels (54) roll on the involute tracks (55). 5), a large number of fine holes (56) are opened on the buffer plate (51), and the left and right ends of the fine holes (56) are communicated with the inner cavities of the first-stage cylinder (1) and the second-stage cylinder (2). The fine holes (56) are tapered holes that gradually become thinner in the direction of the first-stage cylinder (1). A connecting frame is fixed in the second-stage cylinder (2), and a telescopic rod (8) is connected between the connecting frame and the right end face of the pressure seat (52). When the stirrer (3) rotates with the connecting rod (53), and the connecting rod (53) drives the two pressure wheels (54) to rotate along the involute track (55), the pressure seat (52) is pushed by the involute track (55), and under the rebound action of the telescopic rod (8), the pressure seat (52) moves left and right in the second-stage cylinder (2) and the first-stage cylinder (1).

3. A peanut oil extraction process according to claim 2, characterized in that, A conical seat (57) is provided on the left end surface of the buffer plate (51). The conical seat (57) is located in the first-stage cylinder (1) and its taper gradually becomes thinner toward the left. The agitator (3) passes through the conical seat (57). The portion of the buffer plate (51) where the conical seat (57) is installed does not have a fine hole (56). The fine hole (56) is only provided on the buffer plate (51) around the periphery of the conical seat (57).

4. A peanut oil extraction process according to claim 3, characterized in that, The connecting rod (53) is provided with a liquid flow hole (58) communicating with the left and right sides. The pressing wheel (54) is installed on the end of the connecting rod (53) and is far away from the liquid flow hole (58).

5. A peanut oil extraction process according to claim 4, characterized in that, A clamping cavity (9) is provided on the first-stage cylinder (1), and the heating assembly (4) comprises a heating tube (41) filled in the clamping cavity (9) and a heating hole (42) opened between the cylinder cavity of the first-stage cylinder (1) and the clamping cavity (9).

6. A peanut oil extraction process according to claim 5, characterized in that: The heating holes (42) are located at two positions on the left and right. The first tube (6) for injecting peanut oil and the second tube (7) for injecting activated carbon are provided on the first tube (1). The first tube (6) and the second tube (7) are respectively located in the two heating holes (42) in a left-right distribution manner. The stirrer (3) is provided with a first stirring blade (31) in the portion located in the first tube (1). The first tube (6) is located on the left and the inner end thereof enters the first tube (1). The inner end of the second tube (7) enters the first tube (1) and is located above the first stirring blade (31).

7. A peanut oil extraction process according to claim 6, characterized in that: The second tube (7) is tapered, and its inner end gradually tapers toward the first-stage stirring blade (31).

8. A peanut oil extraction process according to claim 7, characterized in that: A secondary stirring blade (32) is provided on the portion of the stirrer (3) that enters the secondary cylinder (2).

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