A soybean oil processing press apparatus and method

Abstract

The application relates to the technical field of soybean oil pressing processing, in particular to a soybean oil processing and pressing device and method, which comprises a pressing table, the right top of the pressing table is equipped with a feeding part, the middle top of the pressing table is equipped with a screw shaft, a screw combination mechanism and an oil discharging mechanism are sequentially installed on the screw shaft from inside to outside, the middle top of the pressing table is also equipped with a screw cage for supporting and fixing the oil discharging mechanism, a screw chamber is formed between the screw combination mechanism and the oil discharging mechanism, the right side of the screw chamber is communicated with the feeding part, the left side is connected with a slag discharging part, and an oil receiving disc is arranged on the pressing table and installed below the oil discharging mechanism. Advantages are that the progressive extrusion structure of the three-stage screw realizes the stepwise decrease of the screw chamber volume and the multi-stage strong extrusion, the three-dimensional flow guide network of the oil discharging mechanism realizes the double-path self-adaptive rapid oil discharging, the triple protection structure of the sealing part prevents the oil leakage, the dry-cake residual oil rate is obviously reduced, the oil extraction efficiency is improved, and the long-term stable operation of the equipment is ensured.

Description

Technical Field

[0001] This invention relates to the field of soybean oil pressing and processing technology, and in particular to a soybean oil pressing and processing apparatus and method. Background Technology

[0002] Soybean oil is one of the main edible vegetable oils in my country, and its processing methods mainly include pressing and solvent extraction. Among them, screw press oil pressing is widely used in small and medium-sized oil mills and fresh oil mills due to its advantages such as simple process, no chemical solvent residue, and natural and healthy products.

[0003] Existing screw oil presses typically operate on a single-stage continuous extrusion principle. The rotating screw pushes the material forward, and the pressure generated by the gradually decreasing volume of the pressing chamber forces the oil out. However, in traditional screw oil presses, the material undergoes only one pressure increase within the pressing chamber. As extrusion continues, the compacted material becomes denser, clogging the oil outlet channels. Even with further pressure increases, the oil is difficult to expel, and some oil is wasted with the oil cake, impacting raw material utilization and economic efficiency. Secondly, screw oil presses are dynamic extrusion devices; the oil squeezed out during pressing needs to be discharged promptly through the oil outlets between the pressing rings. However, traditional pressing rings often employ a densely packed design of small oil channels, which easily leads to poor oil drainage when pressing high-oil-content materials or processing large volumes. When the oil outlet fails to discharge oil in time, the squeezed oil is easily reabsorbed or flows back into the cake, forming a phenomenon of "the pressed oil being sucked back in", which reduces the actual oil yield. Furthermore, under high pressure conditions for a long time, insufficient sealing performance can cause oil to easily seep into the surface of the screw shaft, which can easily affect the stability of the equipment.

[0004] Therefore, in order to improve pressing efficiency and reduce residual oil content in the dried cake, this invention provides a soybean oil processing pressing apparatus and method. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the prior art by proposing a soybean oil processing and pressing device and method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a soybean oil processing pressing device, including a pressing table, a feeding section is assembled on the top right side of the pressing table, a screw shaft is assembled on the top middle part of the pressing table, a screw assembly mechanism and an oil discharge mechanism are installed sequentially from the inside to the outside on the screw shaft, a pressing cage for supporting and fixing the oil discharge mechanism is also assembled on the top middle part of the pressing table, a pressing chamber is formed between the screw assembly mechanism and the oil discharge mechanism, the right side of the pressing chamber is connected to the feeding section, and the left side is connected to the slag discharge section, and an oil receiving tray is provided on the pressing table below the oil discharge mechanism.

[0007] The screw press assembly includes a primary screw press, a secondary screw press, and a tertiary screw press installed from right to left, with a sealing part provided at the docking position between adjacent screw presses of each level.

[0008] The oil discharge mechanism includes multiple pressing rings installed equidistantly along the axial direction, with oil discharge gaps formed between adjacent pressing rings. A set of guide channels is provided on the pressing rings, including an arc-shaped liquid guide channel, an inclined liquid discharge channel group, and an annular liquid discharge channel.

[0009] The three-stage screw press assembly mechanism, with its progressive, release, and extrusion structure, combined with the stepwise decrease in the pressing chamber volume, performs a three-stage high-pressure extrusion operation. The second-stage screw press is used for pressure release, allowing the compacted material to rebound and reopening the blocked oil outlet channels. Combined with the multi-stage oil discharge channels of the guide trough assembly, it achieves three-dimensional flow guidance and dual-path oil discharge.

[0010] In the aforementioned soybean oil processing and pressing device, the primary pressing screw includes a feeding pressing screw 1 and a toothed pressing screw 1 connected to the left end of the feeding pressing screw 1; the secondary pressing screw includes a feeding pressing screw 2 and a toothed pressing screw 2 connected to the left end of the feeding pressing screw 2; and the tertiary pressing screw includes a feeding pressing screw 3 and a smooth pressing table connected to the left end of the feeding pressing screw 3.

[0011] In the aforementioned soybean oil processing and pressing device, the root circle diameters of the feeding screw 1, toothed screw 1, feeding screw 2, toothed screw 3, and feeding screw 3 increase sequentially, and their screw pitches decrease sequentially.

[0012] In the aforementioned soybean oil processing pressing device, the smooth pressing table is a conical structure with a smooth surface. The outer walls of the screw rings of the toothed screw one and the toothed screw two are toothed, and the compacted material is released and rebounds through the position of the toothed screw two teeth.

[0013] In the aforementioned soybean oil processing and pressing device, the sealing part includes a docking groove and a connecting joint, which are respectively disposed on two adjacent end faces of adjacent screw presses, and the connecting joint is inserted into the docking groove.

[0014] In the aforementioned soybean oil processing and pressing device, annular sealing grooves are provided on both the inner and outer walls of the joint, and sealing rings are installed in the annular sealing grooves; annular cotton thread grooves are provided on the side walls of the joint, and cotton thread loops are wound in the annular cotton thread grooves.

[0015] In the aforementioned soybean oil processing and pressing device, the guide channel group also includes multiple oil outlets evenly opened along the circumferential direction on the side of adjacent pressing rings that are close to each other, and the adjacent oil outlets are connected by an arc-shaped liquid guide channel opened on the end face of the pressing ring.

[0016] In the aforementioned soybean oil processing and pressing device, the outer wall of the pressing ring is provided with multiple inclined drainage channels that correspond one-to-one with and are connected to the oil outlets. An annular drainage channel is provided in the middle of the outer wall of the pressing ring, and the ends of the inclined drainage channels are all connected to the annular drainage channel.

[0017] In the aforementioned soybean oil processing and pressing device, the pressing cage includes a protective cover and a support base fitted outside the oil discharge mechanism, and the protective cover and the support base cooperate to open and close.

[0018] As a preferred technical solution of the present invention, the present invention also provides a soybean oil processing and pressing method, which is completed by using the above-mentioned soybean oil processing and pressing equipment, specifically including the following steps: S1: Soybean pretreatment: The cleaned soybeans are successively crushed, softened, rolled, and steamed to obtain cooked blanks that meet the requirements for pressing.

[0019] S2: Equipment Start-up: Start the motor to drive the screw shaft to rotate, and the screw shaft drives the screw assembly mechanism to rotate in the oil discharge mechanism.

[0020] S3: Continuous feeding and multi-stage pressing: The pre-treated soybean blanks are continuously fed into the pressing chamber through the feeding section. The blanks are conveyed from right to left under the push of the screw press assembly mechanism, and undergo multiple compressions and releases.

[0021] S4: Oil discharge and collection: The pressed oil is discharged from the oil discharge mechanism and finally falls into the oil collection tray for collection.

[0022] S5: Cake Discharge: The pressed cake continues to move to the left and is discharged from the slag outlet.

[0023] Compared with existing technologies, the advantages of this invention are as follows: by using the progressive, release, and extrusion structure of the three-stage screw press in conjunction with the stepwise decrease in the pressing chamber volume, multi-stage strong extrusion is achieved; combined with the three-dimensional guide network of the oil discharge mechanism, dual-path adaptive rapid oil discharge is achieved; and by utilizing the triple protection structure of the sealing part, oil leakage is prevented, significantly reducing the residual oil rate of the dry cake, improving oil extraction efficiency, and ensuring long-term stable operation of the equipment.

[0024] 1. The three-stage screw press mechanism, with its progressively increasing root diameter and shallower screw pitch, combined with a step-by-step decrease in pressing chamber volume, achieves progressively increasing extrusion pressure on the material. Simultaneously, it employs a multi-stage high-pressure extrusion structure: the first-stage screw grips and tears the material, the second-stage screw performs initial extrusion and release, and the third-stage screw performs secondary extrusion and re-pressurization. The pressure release at the second-stage screw causes the compacted material to elastically rebound, reopening blocked oil channels, improving pressing efficiency, and significantly reducing the residual oil content in the dried cake.

[0025] 2. Through the three-dimensional flow guiding network design of the oil discharge mechanism, a multi-stage oil discharge channel is constructed, consisting of "oil outlet - arc-shaped liquid guiding groove - inclined liquid discharge groove group - annular liquid discharge groove". This achieves a dual-path adaptive oil discharge function, enabling rapid discharge of small amounts of oil and efficient guidance of large amounts of oil. The path of oil from the outlet to the collection point is short and the resistance is low, effectively preventing oil from returning to the cake. The arc-shaped liquid guiding groove balances the oil discharge pressure at each outlet and allows the oil to diffuse to both sides and fall directly when the oil volume is small, shortening the oil discharge path and reducing oil adhesion. When the oil volume is large, the inclined liquid discharge groove group and the annular liquid discharge groove guide the oil to flow quickly to the annular liquid discharge groove, preventing the formation of "oil blockage" at the oil outlet.

[0026] 3. The triple protection structure, consisting of the sealing groove, the butt joint, the sealing ring, and the cotton coil, effectively prevents high-pressure grease from seeping into the surface of the screw shaft, ensuring long-term stable operation of the equipment. Attached Figure Description

[0027] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0028] Figure 1 This is a schematic diagram of the overall structure;

[0029] Figure 2 A schematic diagram of part of the feeding section, screw shaft, oil discharge mechanism and slag discharge section;

[0030] Figure 3 A schematic cross-sectional view of the screw shaft, screw assembly mechanism, and pressing chamber structure;

[0031] Figure 4 This is a partial structural diagram of the screw press assembly mechanism;

[0032] Figure 5 This is a schematic diagram of the oil discharge mechanism;

[0033] Figure 6 for Figure 3 Enlarged view of point A in the middle;

[0034] Figure 7 for Figure 3 Enlarged diagram of point B in the middle.

[0035] In the diagram: 1. Pressing table; 2. Feeding section; 3. Screw shaft; 4. Screw assembly mechanism; 41. Primary screw; 411. Feeding screw one; 412. Toothed screw one; 42. Secondary screw; 421. Feeding screw two; 422. Toothed screw two; 43. Tertiary screw; 431. Feeding screw three; 432. Smooth pressing table; 44. Sealing section; 441. Connecting groove; 442. Connecting joint; 443. Sealing ring; 444. Cotton coil; 5. Oil discharge mechanism; 51. Pressing ring; 511. Oil outlet; 512. Arc-shaped liquid guide groove; 513. Inclined liquid discharge groove assembly; 514. Annular liquid discharge groove; 6. Pressing cage; 61. Protective cover; 62. Support base; 7. Pressing chamber; 8. Slag discharge section; 9. Oil receiving tray. Detailed Implementation

[0036] 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.

[0037] Reference Figures 1 to 3 A soybean oil processing pressing device includes a pressing table 1. A feeding section 2 is fixedly mounted on the top right side of the pressing table 1. The feeding section 2 includes a feeding funnel and a feeding regulating valve (existing mature technology and not shown in the figure) for controlling the amount of soybean feed.

[0038] The pressing table 1 has a screw shaft 3 rotatably mounted on its top center via a bearing seat (not shown in the figure). A motor (not shown in the figure) is mounted on the top left side of the pressing table 1, and the motor output shaft is connected to the left end of the screw shaft 3.

[0039] The screw shaft 3 is fitted with a screw assembly mechanism 4 and an oil discharge mechanism 5 sequentially from the inside out. The top of the middle part of the pressing table 1 is also equipped with a pressing cage 6 for supporting and fixing the oil discharge mechanism 5.

[0040] The space between the screw press assembly 4 and the oil discharge mechanism 5 forms the pressing chamber 7. The right side of the pressing chamber 7 is connected to the discharge port of the feed section 2, and the left side is connected to the slag discharge section 8. An oil receiving tray 9 is installed on the pressing table 1 below the oil discharge mechanism 5.

[0041] The pressing cage 6 includes a support base 62 and a protective cover 61. The support base 62 is fixedly installed on the pressing table 1. The support base 62 is a semi-circular bracket structure, and its inner diameter matches the outer diameter of the oil discharge mechanism 5. It is used to support the weight of the oil discharge mechanism 5 and withstand radial force. The protective cover 61 covers the upper part of the oil discharge mechanism 5. The protective cover 61 and the support base 62 adopt an openable structure. One side of the protective cover 61 is connected to the support base 62 by a hinge, and the other side is fixed to the support base 62 by bolts, which facilitates the inspection and maintenance of the internal mechanism.

[0042] It should be noted that the protective cover 61 may also be equipped with a pressure relief valve and a temperature sensor interface for monitoring the working status inside the pressing chamber 7. The oil receiving tray 9 is tilted forward and downward at an angle of 5° to 15° to facilitate the automatic flow of oil to the oil collection container under gravity.

[0043] Reference Figures 2 to 4 The screw press assembly 4 includes a primary screw press 41, a secondary screw press 42, and a tertiary screw press 43 installed sequentially from right to left. Each screw press is connected and fixed to the screw press shaft 3 by a key and axially pressed together.

[0044] Specifically, the primary screw press 41 includes a feeding screw press 411 and a toothed screw press 412 connected to the left end of the feeding screw press 411. The feeding screw press 411 has a continuous thread structure with a large pitch, mainly used for rapid material conveying; the outer wall of the screw ring of the toothed screw press 412 is toothed.

[0045] The secondary screw press 42 includes a second feeding screw press 421 and a second toothed screw press 422 connected to the left end of the second feeding screw press 421. The pitch of the second feeding screw press 421 is smaller than that of the first feeding screw press 411, and the outer wall of the screw ring of the second toothed screw press 422 is also toothed.

[0046] The three-stage screw press 43 includes a feeding screw 431 and a smooth pressing table 432 connected to the left end of the feeding screw 431. The pitch of the feeding screw 431 is further reduced, and the smooth pressing table 432 is a smooth conical structure.

[0047] The root circle diameters of the feeding screw 1 411, toothed screw 1 412, feeding screw 2 421, toothed screw 2 422, and feeding screw 3 431 increase sequentially, and their pitches decrease sequentially.

[0048] The volume of the pressing chamber 7 decreases in a stepwise manner from right to left, generating progressively increasing extrusion pressure on the material.

[0049] In the first-stage screw press section 41, the feeding screw press 411 conveys the material blank in the pressing chamber 7 to the toothed screw press 412. The teeth on the surface of the toothed screw press 412 grasp the material blank and tear its cell structure, destroying the cell wall of the oilseed, opening the oil release channel, and at the same time initially compacting the material blank.

[0050] In the secondary screw press section 42, the feeding screw 421 applies high-pressure compression to the initially torn material, causing most of the oil to be squeezed out. Subsequently, in the toothed screw 422 area, the compacted material elastically rebounds at the toothed screw 422 teeth, reopening the blocked oil outlet channels, improving pressing efficiency, and significantly reducing the residual oil content of the dry cake.

[0051] In the third-stage screw press section 43, the feeding screw 431 applies secondary high-pressure extrusion to the material blank, and the smooth pressing table 432 performs full re-pressing on the material blank to further extract the residual oil.

[0052] In summary, the billet passes through the first-stage screw press 41, the second-stage screw press 42, and the third-stage screw press 43 in sequence. The first-stage screw press 41 performs gripping, tearing, and preliminary compaction, the second-stage screw press 42 performs one compression and release, and the third-stage screw press 43 performs a second compression and re-compression.

[0053] Reference Figure 3 and Figure 6 A sealing part 44 is provided at the docking position between adjacent screw presses of different stages. The sealing part 44 includes a docking groove 441 and a connecting joint 442. The docking groove 441 is formed on the left end face of one screw press, and the connecting joint 442 is formed on the right end face of the adjacent screw press. The connecting joint 442 is inserted into the docking groove 441 to form a sealing structure. Both the inner and outer walls of the connecting joint 442 are provided with annular sealing grooves, and a sealing ring 443 is installed in the annular sealing groove.

[0054] It should be noted that the sealing ring 443 is preferably made of oil-resistant fluororubber O-ring, which can withstand high temperatures above 150°C and has a compression rate of 15%-25%.

[0055] The side wall of the connector 442 is provided with an annular cotton thread groove, and a cotton thread loop 444 is wound inside the annular cotton thread groove.

[0056] It should be noted that the cotton coil 444 uses degreased cotton thread, which is soaked in edible oil during installation. This allows it to absorb any trace amounts of oil that may seep out after compression, thus providing an auxiliary sealing effect.

[0057] In summary, the triple protection structure, consisting of two sealing rings 443 and one cotton coil 444, effectively prevents high-pressure grease from seeping into the surface of the screw shaft, ensuring long-term stable operation of the equipment.

[0058] Reference Figure 2 , Figure 3 , Figure 5 and Figure 7 The oil discharge mechanism 5 includes multiple pressing rings 51 installed equidistantly along the axial direction. The pressing rings 51 have a ring structure, and adjacent pressing rings 51 are directly fitted together at their end faces to form an oil discharge gap.

[0059] Multiple oil outlets 511 are evenly distributed along the circumference on the side of adjacent pressing rings 51 that are close to each other. The oil outlets 511 are planar oil trough structures, and in this case, there are 6 of them, evenly distributed along the circumference. Adjacent oil outlets 511 are connected by arc-shaped liquid guiding grooves 512 opened on the end face of the pressing rings 51. The arc-shaped liquid guiding grooves 512 are used to connect the oil flowing out of each oil outlet 511 and balance the oil discharge pressure.

[0060] To achieve three-dimensional flow guidance, the outer wall of the pressing ring 51 is provided with multiple inclined drainage trough groups 513, each corresponding to and connected to the oil outlet 511. An annular drainage trough 514 is provided in the middle of the outer wall of the pressing ring 51, and the ends of the inclined drainage trough groups 513 are all connected to the annular drainage trough 514. The annular drainage trough 514 is an annular groove surrounding the outer wall of the pressing ring 51, serving as the main channel for oil collection.

[0061] During operation, the pressed oil flows out from the oil outlet 511 and overflows outwards.

[0062] During this process, if the amount of oil is small, it can diffuse to both sides through the arc-shaped liquid guide groove 512 and flow downward under the action of gravity, falling into the oil receiving tray 9, reducing the time for the oil to overflow to the outer wall of the pressing ring 51 and then flow downward, and reducing the possibility of the oil adhering to the outer wall of the pressing ring 51 being contaminated.

[0063] If the oil volume is large, it flows out through the oil outlet 511, is diverted by the arc-shaped liquid guide groove 512, and is quickly guided to the annular liquid drain groove 514 through the inclined liquid drain groove group 513, preventing the formation of an "oil plug" at the oil outlet 511. Finally, it falls into the oil receiving pan 9 under the action of gravity, effectively preventing grease retention and backflow.

[0064] In summary, the oil discharge mechanism 5 achieves a dual-path adaptive oil discharge function, which allows for the rapid discharge of small amounts of oil and the efficient diversion of large amounts of oil. The path from oil discharge to collection is short and the resistance is low, effectively preventing oil from returning to the cake meal due to poor oil discharge.

[0065] In addition, the present invention also provides a soybean oil processing and pressing method, which is completed by using the above-mentioned soybean oil processing and pressing device, specifically including the following steps: S1: Soybean pretreatment: The cleaned soybeans are successively crushed, softened, rolled, and steamed to obtain cooked blanks that meet the requirements for pressing.

[0066] S2: Equipment Start-up: Start the motor to drive the screw shaft 3 to rotate, and the screw shaft 3 drives the screw assembly mechanism 4 to rotate within the oil discharge mechanism 5.

[0067] S3: Continuous feeding and multi-stage pressing: The pre-treated soybean blanks are continuously fed into the pressing chamber 7 through the feeding section 2. The blanks are conveyed from right to left under the push of the screw press assembly mechanism 4, and pass through the first-stage screw press 41, the second-stage screw press 42 and the third-stage screw press 43 in sequence, undergoing multiple compressions and releases.

[0068] Meanwhile, during the pressing process, the sealing part 44 prevents high-pressure grease from seeping into the surface of the screw shaft 3 through the triple protection structure of the sealing ring 443 and the cotton coil 444.

[0069] S4: Oil discharge and collection: The pressed oil flows out from the oil outlet 511 between adjacent pressing rings 51 and finally falls into the oil collection tray 9 for collection.

[0070] S5: Cake Discharge: The cake formed after the oil is pressed dry continues to move to the left under the continuous pushing of the screw press assembly 4 and is discharged from the slag discharge section 8, completing the entire pressing process.

[0071] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0072] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0073] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0074] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A soybean oil processing and pressing apparatus, characterized in that: The device includes a pressing table, with a feeding section mounted on the top right side and a screw shaft mounted on the top middle section. A screw assembly mechanism and an oil discharge mechanism are installed sequentially from the inside to the outside on the screw shaft. A pressing cage for supporting and fixing the oil discharge mechanism is also mounted on the top middle section of the pressing table. A pressing chamber is formed between the screw assembly mechanism and the oil discharge mechanism. The right side of the pressing chamber is connected to the feeding section, and the left side is connected to the slag discharge section. An oil receiving tray is installed on the pressing table below the oil discharge mechanism. The screw press assembly includes a first-stage screw press, a second-stage screw press, and a third-stage screw press installed from right to left, with a sealing part provided at the docking position between adjacent screw presses of each stage; The oil discharge mechanism includes multiple pressing rings installed equidistantly along the axial direction, with oil discharge gaps formed between adjacent pressing rings. A set of guide channels is provided on the pressing rings, including an arc-shaped liquid guide channel, an inclined liquid discharge channel group, and an annular liquid discharge channel. The guide channel group also includes multiple oil outlets evenly opened along the circumferential direction on the side of adjacent pressing rings that are close to each other, and the adjacent oil outlets are connected by an arc-shaped liquid guide channel opened on the end face of the pressing ring. The outer wall of the pressing ring is provided with multiple inclined drainage channels that correspond one-to-one with the oil outlet and are connected to each other. An annular drainage channel is provided in the middle of the outer wall of the pressing ring. The ends of the inclined drainage channels are all connected to the annular drainage channel. The three-stage screw press assembly mechanism, with its progressive, release, and extrusion structure, combined with the stepwise decrease in the pressing chamber volume, performs a three-stage high-pressure extrusion operation. The second-stage screw press is used for pressure release, allowing the compacted material to rebound and reopening the blocked oil outlet channels. Combined with the multi-stage oil discharge channels of the guide trough assembly, it achieves three-dimensional flow guidance and dual-path oil discharge.

2. The soybean oil processing and pressing apparatus according to claim 1, characterized in that, The first-stage press screw includes a feeding press screw 1 and a toothed press screw 1 connected to the left end of the feeding press screw 1; the second-stage press screw includes a feeding press screw 2 and a toothed press screw 2 connected to the left end of the feeding press screw 2; the third-stage press screw includes a feeding press screw 3 and a smooth press table connected to the left end of the feeding press screw 3.

3. The soybean oil processing and pressing apparatus according to claim 2, characterized in that, The root circle diameters of the feeding screw 1, toothed screw 1, feeding screw 2, toothed screw 2, and feeding screw 3 increase sequentially, and their pitches decrease sequentially.

4. The soybean oil processing and pressing apparatus according to claim 2, characterized in that, The smooth pressing table has a smooth conical structure. The outer walls of the toothed screws one and two are toothed. The compacted material is released and rebounds through the toothed screw two.

5. The soybean oil processing and pressing apparatus according to claim 1, characterized in that, The sealing part includes a mating groove and a butt joint, which are respectively disposed on two adjacent end faces of the adjacent screw presses, and the butt joint is inserted into the mating groove.

6. The soybean oil processing and pressing apparatus according to claim 5, characterized in that, The inner and outer walls of the connector are provided with annular sealing grooves, and a sealing ring is installed in the annular sealing grooves; the side wall of the connector is provided with annular cotton thread grooves, and a cotton thread loop is wound in the annular cotton thread grooves.

7. The soybean oil processing and pressing apparatus according to claim 1, characterized in that, The pressing cage includes a protective cover and a support base fitted outside the oil discharge mechanism, and the protective cover and the support base cooperate to open and close.

8. A soybean oil processing and pressing method is completed using a soybean oil processing and pressing apparatus as described in claim 1, characterized in that: Includes the following steps: S1: Soybean pretreatment: The cleaned soybeans are successively crushed, softened, rolled into blanks, and steamed and roasted to obtain cooked blanks that meet the requirements for pressing. S2: Equipment Start-up: Start the motor to drive the screw shaft to rotate, and the screw shaft drives the screw assembly mechanism to rotate in the oil discharge mechanism; S3: Continuous feeding and multi-stage pressing: The pre-treated soybean blanks are continuously fed into the pressing chamber through the feeding section. The blanks are conveyed from right to left under the push of the screw press assembly mechanism, and undergo multiple compressions and releases. S4: Oil discharge and collection: The pressed oil is discharged from the oil discharge mechanism and finally falls into the oil collection tray for collection; S5: Cake Discharge: The pressed cake continues to move to the left and is discharged from the slag outlet.

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