Cold press oil expeller with three-stage pressurization structure

Abstract

This invention discloses a cold-press oil press with a three-stage pressure structure, belonging to the technical field of oilseed processing equipment. It includes a frame, with a pressing device and a power unit sequentially installed at the left and right ends of the frame. A feeding device and a slag discharge device are sequentially installed above and to the left of the pressing device. The pressing device includes a first-stage feeding pre-pressing mechanism, a second-stage main pressure oil discharge mechanism, and a third-stage pressure-stabilizing oil draining mechanism, all of which are cold-pressing mechanisms. Through the three-stage segmented pressing design, a continuous pressure gradient of "pre-pressing → main pressure → stabilizing pressure" is formed under cold conditions. The first stage performs preliminary compression of loose oilseeds, the second stage implements high-pressure pressing to extract most of the oil, and the third stage stabilizes the pressure to ensure sufficient drainage of residual oil. This structure significantly reduces the residual oil rate in the oil cake and eliminates the need for repeated pressing, greatly reducing energy consumption per unit output.

Description

Technical Field

[0001] This invention relates to the field of oil processing equipment technology, specifically a cold press oil press with a three-stage pressure structure. Background Technology

[0002] Oil pressing machinery is the core equipment for oilseed processing. Currently, the mainstream technologies in the industry are divided into two main categories: hydraulic oil presses and screw oil presses. The corresponding oil pressing processes are mainly divided into two technical routes: hot pressing and cold pressing.

[0003] Hot pressing process: Traditional hot pressing requires complex pretreatment procedures such as high-temperature roasting, crushing, steaming, and embryo formation of oilseeds. This process has multiple drawbacks: First, high-temperature processing consumes a large amount of heat energy, electricity, and labor, resulting in high processing costs and low profit margins; second, high temperatures severely damage heat-sensitive nutrients such as unsaturated fatty acids and vitamin E in oilseeds, leading to a significant decrease in the nutritional value of the finished oil; more seriously, high-temperature roasting can easily produce carcinogenic and harmful substances such as benzo[a]pyrene, affecting the safety of edible oil.

[0004] Cold pressing process: Although cold pressing technology avoids the damage caused by high temperatures and preserves the natural nutrients of oilseeds, existing technologies still have the following problems:

[0005] Incomplete pressing and high residual oil content: In cold pressing mode, traditional single-screw oil presses or hydraulic oil presses have unreasonable pressure increase design and uneven pressure gradient distribution in the pressing chamber, which means that the oilseeds cannot be fully compressed when passing through once. In actual production, the same batch of oilseeds usually needs to be pressed repeatedly, or the result of high residual oil content in the cake is forced, resulting in serious waste of raw materials.

[0006] Discontinuous pressure transmission: The spiral groove depth of existing screw oil presses is usually kept constant or simply decreased, lacking a segmented pressure gradient design, which leads to sudden rises and falls in pressure during the pressing process. The oil inside the oilseed cannot seep out steadily and continuously, thus limiting the oil extraction efficiency.

[0007] Insufficient cell wall disruption in oilseeds: Under cold pressing conditions, the cell walls of oilseeds maintain high toughness. Traditional smooth spiral blades only exert a squeezing effect on the oilseeds, lacking an effective shearing and cell wall disruption mechanism, making it difficult to fully release the oil inside the cells. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a cold press with a three-stage pressure structure. Through the scientific design of the three-stage pressure gradient, it can achieve continuous, efficient and low residual oil pressing, while taking into account low energy consumption and compact structure, so as to solve the problems of high residual oil, high energy consumption, discontinuous pressure transmission and insufficient cell wall breaking of oilseeds in the existing cold pressing process.

[0009] To solve the above-mentioned technical problems, the technical solution of the present invention is implemented as follows:

[0010] A cold-pressing oil press with a three-stage pressurization structure includes a frame, with a pressing device and a power unit for driving the pressing device installed sequentially at the left and right ends of the frame, and a feeding device and a slag discharge device installed sequentially above and to the left of the pressing device. The core improvement is that the pressing device includes a first-stage feeding pre-pressing mechanism, a second-stage main pressure oil discharge mechanism, and a third-stage pressure stabilizing oil draining mechanism, which are sequentially connected from the feeding device to the slag discharge device. The first-stage feeding pre-pressing mechanism, the second-stage main pressure oil discharge mechanism, and the third-stage pressure stabilizing oil draining mechanism are all cold-pressing mechanisms.

[0011] By adopting the above scheme and using a three-stage segmented pressing design, a continuous pressure gradient of "pre-pressing → main pressing → stabilizing pressure" is formed under cold conditions (normal temperature or low temperature). The first stage performs preliminary compression on loose oilseeds, the second stage performs high-pressure pressing to extract most of the oil, and the third stage stabilizes the pressure to ensure that the residual oil is fully drained. This structure avoids the poor oil extraction caused by sudden pressure changes in traditional single-stage pressing, significantly reduces the residual oil rate in the cake, and eliminates the need for repeated pressing, greatly reducing energy consumption per unit output.

[0012] In a preferred embodiment of a cold-pressed oil press with a three-stage pressurization structure, the first-stage feeding and pre-pressing mechanism is connected to the feeding device. The first-stage feeding and pre-pressing mechanism includes a first-stage pre-pressing chamber arranged laterally, and a central screw shaft rotatably mounted coaxially inside the first-stage pre-pressing chamber. A first-stage spiral pre-pressing groove located inside the first-stage pre-pressing chamber is spirally mounted on the central screw shaft. The first stage uses a transverse pre-pressing chamber in conjunction with a spiral conveyor to continuously and evenly push the loose oilseeds fed by the feeding device into the pressing area. During the conveying process, the spiral structure naturally generates preliminary compression, causing the oilseed volume to gradually decrease and the density to increase, preparing it for entering the second-stage high-pressure zone and avoiding equipment overload or oil backflow caused by instantaneous high pressure.

[0013] In a preferred embodiment of a cold-pressed oil press with a three-stage pressurization structure, the second-stage main pressure oil outlet mechanism includes a horizontally arranged second-stage main pressing chamber. A coaxially arranged central screw shaft is rotatably installed inside the second-stage main pressing chamber. A second-stage spiral main pressure groove located inside the second-stage main pressing chamber is installed spirally on the central screw shaft. Multiple circumferentially arrayed oil outlet holes are opened on the chamber wall of the second-stage main pressing chamber. The second stage, as the core pressing area, applies continuously increasing extrusion pressure to the pre-pressed oilseeds through the spiral grooves, forcing the oil to precipitate from the oilseed cells and be discharged through the circumferentially arrayed oil outlet holes, shortening the oil flow path and improving the oil extraction efficiency.

[0014] In a preferred embodiment of a cold-pressed oil press with a three-stage pressurization structure, the third-stage pressure-stabilizing and draining mechanism is connected to the slag discharge device. This third-stage pressure-stabilizing and draining mechanism includes a horizontally arranged third-stage pressure-stabilizing pressing chamber. A coaxially arranged central screw shaft is rotatably installed within the chamber. A third-stage spiral pressure-stabilizing groove is spirally installed on this central screw shaft within the chamber. Multiple circumferentially arrayed draining holes are formed on the chamber wall of the third-stage pressure-stabilizing pressing chamber. The third stage employs a pressure-stabilizing design to maintain pressure and drain the oil cake after the main pressing, allowing residual oil to fully seep out under continuous pressure, further reducing the residual oil rate. The draining holes ensure that the oil in the final stage can be smoothly discharged, preventing oil accumulation inside the oil cake.

[0015] In a preferred embodiment of a cold-press oil press with a three-stage pressurization structure, the central screw shafts in the first-stage pre-pressing chamber, the second-stage main pressing chamber, and the third-stage stabilizing pressing chamber are all the same central screw shaft. This central screw shaft runs through the entire first-stage pre-pressing chamber, the second-stage main pressing chamber, and the third-stage stabilizing pressing chamber. The use of a single central screw shaft through all three pressing chambers ensures synchronous rotation of the three screws, resulting in direct and efficient power transmission and avoiding power loss and synchronization problems associated with multi-shaft drives. The right end of this central screw shaft is sequentially and rotatably mounted in the frame through a sealing sleeve and bearing. The cooperation of the sealing sleeve and bearing ensures rotational sealing and prevents oil from seeping into the frame. The first-stage pre-pressing chamber and the second-stage main pressing chamber are integrated pressing chambers, enhancing structural rigidity and reducing vibration. The pressing chamber between the second-stage main pressing chamber and the third-stage stabilizing pressing chamber is detachable, facilitating equipment cleaning, maintenance, and replacement of vulnerable parts, thus improving the practicality and ease of maintenance of the equipment.

[0016] As a preferred embodiment of a cold-press oil press with a three-stage pressurization structure, the depth of the first-stage spiral pre-pressing groove is greater than the depth of the second-stage spiral main pressing groove, which is greater than the depth of the third-stage spiral stabilizing groove. This achieves a perfect match between the progressively decreasing spiral groove depth (deep → medium → shallow) and the three-stage pressure gradient. The first-stage deep groove accommodates loose oilseeds and performs initial compression. The second-stage medium groove further compresses the oilseed volume under high pressure. The third-stage shallow groove performs final compression on the formed oil cake during the stabilization stage. This allows the oilseed volume to naturally shrink during transport, and the pressure to continuously increase. This avoids pressure transmission interruption caused by a constant groove depth or poor feeding caused by a shallow groove depth, significantly improving pressing efficiency and oil yield.

[0017] As a preferred embodiment of a cold-press oil press with a three-stage pressure structure, uniformly distributed, inward-facing cell-breaking spikes are provided along the edges of the spiral pressure grooves of the first-stage spiral pre-press groove, the second-stage spiral main pressure groove, and the third-stage spiral stabilizing groove. During the spiral rotation, these spikes shear and pierce the oilseeds, effectively breaking down the cell walls and releasing the intracellular oil. This design is specifically designed to address the high cell wall toughness under cold-pressing conditions. By using mechanical cell-breaking to assist pressure pressing, the oil is more easily extracted without relying on high-temperature softening of the cell walls. This achieves an oil yield close to that of hot pressing under cold conditions while preserving the nutritional components of the oilseeds.

[0018] As a preferred embodiment of a cold press with a three-stage press structure, the power unit includes a reducer coaxially connected to the central stud and a motor that drives the reducer. The reducer converts the high speed of the motor into the low speed and high torque output required by the pressing chamber, ensuring a smooth and powerful pressing process, continuously providing the high pressure required for pressing, while reducing the motor load and extending the service life of the equipment.

[0019] In a preferred embodiment of a cold-press oil press with a three-stage pressurization structure, the feeding device includes a vertically arranged hopper and a throat pipe vertically connecting the hopper to the top of the first-stage pre-pressing chamber. A horizontally arranged equalizing plate is fixed inside the throat pipe, and multiple circumferentially arrayed equalizing ports are provided on the equalizing plate. The hopper and throat pipe enable vertical transport of oil, and the equalizing ports on the equalizing plate ensure that the oil is evenly dispersed into the first-stage pre-pressing chamber, preventing bridging or blockage. A mounting screw hole is also provided at the center of the equalizing plate. A booster nozzle is detachably installed inside the mounting screw hole. A top cover plate is connected to the nozzle body to seal all material feeding ports. A handle is also connected to the top of the nozzle to assist its rotation. The booster nozzle is designed to clean the residue clogging the oil outlet and drain hole. When connected to an air source, air can be injected into the throat through the booster nozzle to increase the internal pressure. The airflow blows out the residue clogging the oil outlet and drain hole. The whole process can be completed without disassembling the pressing chamber, making it more convenient to use.

[0020] In a preferred embodiment of a cold-press oil press with a three-stage pressurization structure, the residue discharge device includes a fixed residue discharge nozzle coaxially mounted with the third-stage pressure-stabilizing chamber; a first-stage adjustable residue discharge nozzle, adjustable in position axially, is coaxially mounted inside the fixed residue discharge nozzle via threads; a second-stage adjustable residue discharge nozzle, adjustable in position axially, is coaxially mounted inside the first-stage adjustable residue discharge nozzle via threads; a cake outlet is coaxially mounted inside the second-stage adjustable residue discharge nozzle; and a cake outlet for residue forming is provided at the center of the cake outlet. The machine employs a two-stage nested, threaded adjustable slag nozzle structure. By rotating and adjusting the axial position of the primary and secondary adjustable slag nozzles, the back pressure at the cake outlet can be precisely changed. The back pressure adjustment directly affects the pressure inside the pressing chamber and the thickness of the oil cake. Increasing the back pressure raises the pressure inside the chamber, reduces the residual oil rate, but increases power consumption; decreasing the back pressure speeds up cake discharge and increases output. This design allows the equipment to flexibly adjust pressing parameters according to different oilseed varieties (such as peanuts, rapeseed, sesame, etc.) and process requirements, achieving multi-purpose functionality and improving equipment adaptability and economic efficiency.

[0021] After adopting the above technical solution, the beneficial effects of the present invention are:

[0022] 1. Significantly reduced residual oil content: Through a three-stage progressive pressure design (pre-pressing → main pressure → stabilizing pressure) combined with a spiral groove depth gradient reduction and a wall-breaking nozzle, the oilseeds are fully pressed in a cold state, reducing the residual oil content in the cake and increasing the oil yield.

[0023] 2. Complete preservation of nutrients: The entire process is cold-pressed without high-temperature roasting, which fully preserves the heat-sensitive nutrients in the oilseeds, such as unsaturated fatty acids and vitamin E, and avoids the formation of harmful substances such as benzo[a]pyrene. The finished oil is of high quality, high nutritional value and good safety.

[0024] 3. Significantly reduced energy consumption: The three-stage continuous pressing design eliminates the need for repeated pressing, achieving the ideal residual oil rate in a single pass; the coaxial integrated screw shaft, combined with efficient transmission, reduces power loss.

[0025] 4. The equipment has a compact structure and is easy to maintain: a single central screw shaft runs through the three-stage pressing chamber, making the transmission simple and reliable; the integrated design of the first and second stage pressing chambers enhances rigidity, and the detachable connection between the second and third stages facilitates cleaning and maintenance; the adjustable slag discharge device is suitable for various oilseeds and does not require replacement of core components.

[0026] 5. Convenient cleaning of clogged material residue: The design of the booster nozzle is used to clean the material residue clogging the oil outlet and oil drain hole. When connected to an air source, air can be injected into the throat through the booster nozzle to increase the pressure inside the chamber, and the material residue clogging the oil outlet and oil drain hole will be blown out by the airflow.

[0027] 6. Cell wall breaking and efficiency enhancement: The cell wall breaking spikes on the edge of the spiral groove actively break down the cell walls of oilseeds under cold pressing conditions, making up for the lack of high cell wall toughness under cold pressing conditions, so that the oil is released more fully and the oil extraction efficiency is close to the level of hot pressing. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A three-dimensional structural diagram of a cold-press oil press with a three-stage pressurization structure;

[0030] Figure 2 To showcase Figure 1 Front view structural diagram of the internal structure;

[0031] Figure 3 for Figure 2 Front view structural diagram of the first-stage feeding pre-compression mechanism;

[0032] Figure 4 for Figure 2 Front view structural diagram of the second-stage main pressure oil outlet mechanism;

[0033] Figure 5 for Figure 2 The main view of the third-stage pressure-stabilizing oil-draining mechanism;

[0034] Figure 6 A three-dimensional structural diagram of the first-stage spiral pre-compression groove, the second-stage spiral main compression groove, and the third-stage spiral stabilizing groove after they are spirally installed on the central spiral shaft;

[0035] Figure 7 This is a three-dimensional structural diagram of the first-stage spiral preloading groove;

[0036] Figure 8 This is a three-dimensional structural diagram of the second-stage spiral main pressure groove;

[0037] Figure 9 This is a three-dimensional structural diagram of the third-stage spiral voltage stabilizing groove;

[0038] Figure 10 A three-dimensional structural diagram of the central screw shaft;

[0039] Figure 11 for Figure 1 A three-dimensional structural diagram of the feeding device (during normal feeding).

[0040] Figure 12 for Figure 1 A three-dimensional structural diagram of the feeding device (when clearing blockages and slag);

[0041] Figure 13 for Figure 2 Main view of the slag discharge device.

[0042] In the diagram, the markings are: 1-frame; 2-power unit; 21-reducer; 22-motor; 3-feeding device; 31-hopper; 32-throat; 33-leveling plate; 34-leveling port; 35-mounting screw hole; 36-boosting nozzle; 37-top cover plate; 38-rotor; 4-slag discharge device; 41-fixed slag discharge nozzle; 42-primary adjustable slag discharge nozzle; 43-secondary adjustable slag discharge nozzle; 44-cake outlet; 45-cake outlet. 5-First-stage feeding and pre-compression mechanism; 51-First-stage pre-compression chamber; 52-First-stage spiral pre-compression groove; 6-Second-stage main pressure oil outlet mechanism; 61-Second-stage main pressure chamber; 62-Second-stage spiral main pressure groove; 63-Oil outlet hole; 7-Third-stage pressure stabilizing and oil draining mechanism; 71-Third-stage pressure stabilizing chamber; 72-Third-stage spiral pressure stabilizing groove; 73-Oil draining hole; 8-Central screw shaft; 9-Sealing sleeve; 10-Bearing; 11-Cell wall breaking spike. Detailed Implementation

[0043] 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.

[0044] like Figures 1 to 2 As shown, a cold-pressing oil press with a three-stage pressurization structure is provided, including a frame 1. A pressing device and a power unit 2 for driving the pressing device are installed sequentially at the left and right ends of the frame 1. A feeding device 3 and a slag discharge device 4 are installed sequentially above and to the left of the pressing device. The pressing device includes a first-stage feeding pre-pressing mechanism 5, a second-stage main pressure oil discharge mechanism 6, and a third-stage pressure stabilizing oil draining mechanism 7, which are sequentially connected from the feeding device 3 to the slag discharge device 4. The first-stage feeding pre-pressing mechanism 5, the second-stage main pressure oil discharge mechanism 6, and the third-stage pressure stabilizing oil draining mechanism 7 are all cold-pressing mechanisms. Through a three-stage segmented pressing design, a continuous pressure gradient of "pre-pressing → main pressing → stabilizing pressure" is formed under cold conditions (normal temperature or low temperature). The first stage performs preliminary compression on loose oilseeds, the second stage performs high pressure to extract most of the oil, and the third stage stabilizes the pressure to ensure that the residual oil is fully drained. This structure avoids the poor oil extraction caused by sudden pressure changes in traditional single-stage pressing, significantly reduces the residual oil rate in the cake, and eliminates the need for repeated pressing, greatly reducing energy consumption per unit output.

[0045] like Figure 3 , Figure 6 , Figure 7 As shown, the first-stage feeding pre-pressing mechanism 5 is connected to the feeding device 3. The first-stage feeding pre-pressing mechanism 5 includes a first-stage pre-pressing chamber 51 arranged laterally. A central screw shaft 8 is rotatably installed in the first-stage pre-pressing chamber 51. A first-stage spiral pre-pressing groove 52 located in the first-stage pre-pressing chamber 51 is installed on the central screw shaft 8 in a spiral manner. The first stage uses a transverse pre-pressing chamber in conjunction with a spiral conveyor to continuously and evenly push the loose oilseeds fed by the feeding device 3 into the pressing area. The spiral structure naturally generates preliminary compression during the conveying process, so that the volume of the oilseeds gradually decreases and the density increases, preparing it for entering the second-stage high-pressure zone and avoiding equipment overload or oil backflow caused by instantaneous high pressure.

[0046] like Figure 4 , Figure 6 , Figure 8 As shown, the second-stage main pressing oil extraction mechanism 6 includes a horizontally arranged second-stage main pressing chamber 61. A coaxially arranged central screw shaft 8 is rotatably installed inside the second-stage main pressing chamber 61. A second-stage spiral main pressing groove 62 located inside the second-stage main pressing chamber 61 is spirally installed on the central screw shaft 8. Multiple circumferentially arrayed oil extraction holes 63 are opened on the chamber wall of the second-stage main pressing chamber 61. The second stage, as the core pressing area, applies continuously increasing extrusion pressure to the pre-pressed oilseeds through the spiral grooves, forcing the oil to precipitate from the oilseed cells and be discharged through the circumferentially arrayed oil extraction holes 63, shortening the oil flow path and improving the oil extraction efficiency.

[0047] like Figure 5 , Figure 6 , Figure 9 As shown, the third-stage pressure-stabilizing oil-draining mechanism 7 is connected to the slag discharge device 4. The third-stage pressure-stabilizing oil-draining mechanism 7 includes a third-stage pressure-stabilizing pressing chamber arranged laterally. A central screw shaft 8 is rotatably installed in the third-stage pressure-stabilizing pressing chamber. A third-stage spiral pressure-stabilizing groove 72 located in the third-stage pressure-stabilizing pressing chamber is installed on the central screw shaft 8 in a spiral manner. Multiple circumferentially arrayed oil-draining holes 73 are opened on the chamber wall of the third-stage pressure-stabilizing pressing chamber. The third stage adopts a pressure-stabilizing design to maintain pressure and drain the oil cake after the main pressing, so that the residual oil inside can fully seep out under continuous pressure, further reducing the residual oil rate. The oil-draining holes 73 ensure that the oil in the final stage can be smoothly discharged, avoiding oil accumulation inside the oil cake.

[0048] like Figures 3 to 5 , Figure 10As shown, the central screw shaft 8 in the first-stage pre-pressing chamber 51, the central screw shaft 8 in the second-stage main pressing chamber 61, and the central screw shaft 8 in the third-stage stabilizing pressing chamber are all the same central screw shaft 8. This central screw shaft 8 runs through the entire first-stage pre-pressing chamber 51, the second-stage main pressing chamber 61, and the third-stage stabilizing pressing chamber. The use of a single central screw shaft 8 running through all three pressing chambers ensures synchronous rotation of the three screws, resulting in direct and efficient power transmission and avoiding power loss and synchronization problems associated with multi-shaft drives. The right end of the screw shaft 8 is rotatably and sealed within the frame 1 via a sealing sleeve 9 and a bearing 10. The cooperation between the sealing sleeve 9 and the bearing 10 ensures rotational sealing and prevents oil from seeping into the frame 1. The first-stage pre-pressing chamber 51 and the second-stage main pressing chamber 61 are integrated pressing chambers, which enhances structural rigidity and reduces vibration. The pressing chamber between the second-stage main pressing chamber 61 and the third-stage stabilizing pressing chamber is a detachable pressing chamber, which facilitates equipment cleaning, maintenance, and replacement of vulnerable parts, improving the practicality and maintenance convenience of the equipment.

[0049] like Figures 3 to 5 , Figures 7 to 9 As shown, the depth of the first-stage spiral pre-compression groove 52 is greater than the depth of the second-stage spiral main compression groove 62, which is greater than the depth of the third-stage spiral stabilizing groove 72, so as to achieve a perfect match between the progressively decreasing spiral groove depth (deep → medium → shallow) and the three-stage pressure gradient. The first-stage deep groove accommodates loose oilseeds and performs initial compression. The second-stage medium groove further compresses the volume of oilseeds under high pressure. The third-stage shallow groove performs final compression on the formed oil cake during the stabilizing stage, so that the volume of oilseeds naturally shrinks during transportation and the pressure continuously increases. This avoids the interruption of pressure transmission caused by the constant groove depth or the poor feeding caused by the shallow groove depth, and significantly improves the pressing efficiency and oil yield.

[0050] like Figures 6 to 9 As shown, uniformly distributed, inward-facing wall-breaking spikes 11 are provided on the edges of the spiral pressure grooves along the first-stage spiral pre-compression groove 52, the second-stage spiral main pressure groove 62, and the third-stage spiral stabilizing groove 72. During the spiral rotation, these spikes shear and pierce the oilseeds, effectively breaking down the cell walls and releasing the intracellular oil. This design is specifically designed to address the high cell wall toughness under cold-pressing conditions. By using mechanical wall-breaking to assist pressure pressing, the oil is more easily extracted without relying on high-temperature softening of the cell walls. This achieves an oil yield close to that of hot pressing under cold conditions while preserving the nutritional components of the oilseeds.

[0051] like Figure 2 As shown, the power unit 2 includes a reducer 21 coaxially connected to the central stud and a motor 22 that drives the reducer 21. The reducer 21 converts the high speed of the motor 22 into the low speed and high torque output required by the pressing chamber, ensuring a smooth and powerful pressing process, continuously providing the high pressure required for pressing, while reducing the load on the motor 22 and extending the service life of the equipment.

[0052] like Figures 11 to 12 As shown, the feeding device 3 includes a vertically arranged hopper 31 and a throat 32 that vertically connects the hopper 31 to the top of the first-stage pre-pressing chamber 51. A horizontally arranged equalizing plate 33 is fixed inside the throat 32. The equalizing plate 33 has multiple circumferentially arrayed equalizing ports 34. The hopper 31 and the throat 32 achieve vertical conveying of oil, and the equalizing ports 34 on the equalizing plate 33 ensure that the oil is evenly dispersed into the first-stage pre-pressing chamber 51, preventing bridging or blockage. A mounting screw hole 35 is also provided at the center of the equalizing plate 33 for disassembly. The press is equipped with a pressure booster nozzle 36, and a top cover plate 37 is connected to the nozzle body of the pressure booster nozzle 36 to seal all the material distribution ports 34. A handle 38 is also connected to the top of the nozzle of the pressure booster nozzle 36 to assist its rotation. The pressure booster nozzle 36 is designed to clean the material residue blocking the oil outlet 63 and the oil drain hole 73. When connected to an air source, air can be injected into the throat pipe 32 through the pressure booster nozzle 36 to increase the internal pressure. The airflow blows out the material residue blocking the oil outlet 63 and the oil drain hole 73. The whole process can be completed without disassembling the pressing chamber, making it more convenient to use.

[0053] like Figure 13 As shown, the slag discharge device 4 includes a fixed slag discharge nozzle 41 coaxially mounted with the third-stage pressure-stabilizing pressing chamber. Inside the fixed slag discharge nozzle 41, a primary adjustable slag discharge nozzle 42, whose position can be adjusted axially, is coaxially mounted via threads. Inside the primary adjustable slag discharge nozzle 42, a secondary adjustable slag discharge nozzle 43, whose position can be adjusted axially, is coaxially mounted via threads. A cake outlet 44 is coaxially mounted inside the secondary adjustable slag discharge nozzle 43, and a cake outlet 45 for slag material forming is provided at the center of the cake outlet 44. The above employs a two-stage process. The nested, threaded adjustable slag nozzle structure allows for precise adjustment of the back pressure at the cake outlet 45 by rotating the primary and secondary adjustable slag nozzles 43 to change their axial position. The back pressure adjustment directly affects the pressure inside the pressing chamber and the thickness of the oil cake. Increasing the back pressure raises the internal pressure, reduces the residual oil content, but increases power consumption. Decreasing the back pressure speeds up cake discharge and increases output. This design enables the equipment to flexibly adjust pressing parameters according to different oilseed varieties (such as peanuts, rapeseed, sesame, etc.) and process requirements, achieving multi-purpose functionality and improving equipment adaptability and economic efficiency.

[0054] like Figures 1 to 2 As shown, the working principle of this cold-press oil press with a three-stage pressure structure is as follows:

[0055] When the present invention is in operation, the motor 22 drives the central screw shaft 8 to rotate through the reducer 21; the oil enters the first-stage pre-pressing chamber 51 from the hopper 31 through the throat pipe 32, and the uniform feeding plate 33 ensures uniform feeding; the central screw shaft 8 drives the first-stage spiral pre-pressing groove 52 to rotate, pushing the oil to the second stage, while the wall-breaking spikes 11 on the edge of the spiral groove perform preliminary shearing and wall breaking on the oil, and the first stage with a larger groove depth compresses the loose oil initially.

[0056] After the oilseeds enter the second-stage main pressing chamber 61, the second-stage spiral main pressing groove 62 is shallower, which applies a continuously increasing squeezing force to the oilseeds to achieve high-pressure pressing. The oil is separated from the oilseed cells and discharged through the oil outlet 63 on the chamber wall. During this stage, the cell wall breaking head 11 continuously breaks the cell wall and releases the oil inside the cells. Most of the oil is extracted during this stage.

[0057] The oil cake enters the third-stage pressure-stabilizing chamber. The third-stage spiral pressure-stabilizing groove 72 has the shallowest depth, which stabilizes and maintains the pressure of the oil cake. Under continuous pressure, the residual oil is fully seeped out through the oil drain hole 73, further reducing the residual oil rate.

[0058] Finally, the oil cake is discharged through the slag discharge device 4; by rotating and adjusting the axial position of the primary adjustable slag discharge nozzle 42 and the secondary adjustable slag discharge nozzle 43, and setting a suitable back pressure, the oil cake is formed and discharged from the cake outlet 45. Throughout the process, the depth of the three-stage spiral groove decreases step by step (deep → medium → shallow), and the pressure increases step by step (low → high → stable), forming a scientific pressure gradient to ensure that the oilseeds are continuously, efficiently, and with low residual oil content through cold pressing.

[0059] When the oil outlet 63 and the oil drain hole 73 are blocked by residue, a booster nozzle 36 is installed in the mounting screw hole 35, and an air source is connected to the top of the booster nozzle 36. The booster nozzle 36 is designed to clean the residue blocking the oil outlet 63 and the oil drain hole 73. By connecting the air source, air can be injected into the throat 32 through the booster nozzle 36 to increase the pressure inside the chamber. The airflow blows out the residue blocking the oil outlet 63 and the oil drain hole 73. The whole process can be completed without disassembling the pressing chamber, making it more convenient to use.

[0060] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cold-pressing oil press with a three-stage pressurization structure, comprising a frame, a pressing device and a power device for driving the pressing device are sequentially installed at the left and right ends of the frame, and a feeding device and a slag discharge device are sequentially installed above and to the left of the pressing device; characterized in that: The pressing device includes a first-stage feeding pre-pressing mechanism, a second-stage main pressure oil discharge mechanism, and a third-stage pressure stabilizing oil draining mechanism, which are sequentially connected from the feeding device to the slag discharge device. The first-stage feeding pre-pressing mechanism, the second-stage main pressure oil discharge mechanism, and the third-stage pressure stabilizing oil draining mechanism are all cold pressing mechanisms.

2. The cold press oil press with a three-stage pressurization structure according to claim 1, characterized in that: The first-stage feeding and pre-pressing mechanism is connected to the feeding device; the first-stage feeding and pre-pressing mechanism includes a first-stage pre-pressing chamber arranged laterally, a central screw shaft arranged coaxially is rotatably installed in the first-stage pre-pressing chamber, and a first-stage spiral pre-pressing groove located in the first-stage pre-pressing chamber is installed on the central screw shaft in a spiral manner.

3. The cold press oil press with a three-stage pressurization structure according to claim 2, characterized in that: The second-stage main pressure oil outlet mechanism includes a second-stage main pressing chamber arranged laterally, a central screw shaft arranged coaxially rotatably installed inside the second-stage main pressing chamber, a second-stage spiral main pressure groove located inside the second-stage main pressing chamber is installed on the central screw shaft in a spiral manner, and multiple oil outlet holes arranged in a circumferential array are opened on the chamber wall of the second-stage main pressing chamber.

4. The cold press oil press with a three-stage pressurization structure according to claim 3, characterized in that: The third-stage pressure-stabilizing oil-draining mechanism is connected to the slag discharge device; the third-stage pressure-stabilizing oil-draining mechanism includes a third-stage pressure-stabilizing pressing chamber arranged laterally, a central screw shaft arranged coaxially is rotatably installed in the third-stage pressure-stabilizing pressing chamber, a third-stage spiral pressure-stabilizing groove located in the third-stage pressure-stabilizing pressing chamber is installed on the central screw shaft in a spiral manner, and multiple circumferentially arrayed oil-draining holes are opened on the chamber wall of the third-stage pressure-stabilizing pressing chamber.

5. The cold press oil press with a three-stage pressurization structure according to claim 4, characterized in that: The central screw shaft in the first-stage pre-pressing chamber, the central screw shaft in the second-stage main pressing chamber, and the central screw shaft in the third-stage stabilizing pressing chamber are all the same central screw shaft. This central screw shaft runs through the entire first-stage pre-pressing chamber, the second-stage main pressing chamber, and the third-stage stabilizing pressing chamber. The right end of this central screw shaft is rotatably installed in the frame through a sealing sleeve and a bearing. The first-stage pre-pressing chamber and the second-stage main pressing chamber are integrated pressing chambers, while the second-stage main pressing chamber and the third-stage stabilizing pressing chamber are detachable pressing chambers.

6. The cold press oil press with a three-stage pressurization structure according to claim 4, characterized in that: The depth of the first-stage spiral pre-compression groove is greater than the depth of the second-stage spiral main compression groove, which is greater than the depth of the third-stage spiral stabilizing groove.

7. The cold press oil press with a three-stage pressurization structure according to claim 4, characterized in that: The edges of the spiral pressure grooves along the first-stage spiral pre-pressure groove, the second-stage spiral main pressure groove, and the third-stage spiral stabilizing groove are all provided with uniformly distributed, inward-facing wall-breaking spikes.

8. The cold press oil press with a three-stage pressurization structure according to claim 1, characterized in that: The power unit includes a reducer coaxially connected to the central stud and a motor that drives the reducer.

9. The cold press oil press with a three-stage pressurization structure according to claim 1, characterized in that: The feeding device includes a vertically arranged hopper and a throat pipe that vertically connects the hopper to the top of the first-stage pre-pressing chamber. A horizontally arranged equalizing plate is fixed inside the throat pipe. Multiple equalizing ports are arranged in a circumferential array on the equalizing plate. A mounting screw hole is also provided at the center of the equalizing plate. A booster nozzle is detachably installed in the mounting screw hole. An upper cover plate that can seal all equalizing ports is connected to the nozzle body. A handle that assists in the rotation of the booster nozzle is also connected to the top of the nozzle.

10. The cold press oil expeller with three-stage pressurization structure as claimed in claim 1, wherein: The slag discharge device includes a fixed slag discharge nozzle coaxially mounted with the third-stage pressure-stabilizing pressing chamber. Inside the fixed slag discharge nozzle, a first-stage adjustable slag discharge nozzle, whose position can be adjusted along its axial direction, is coaxially mounted via threads. Inside the first-stage adjustable slag discharge nozzle, a second-stage adjustable slag discharge nozzle, whose position can be adjusted along its axial direction, is coaxially mounted via threads. Inside the second-stage adjustable slag discharge nozzle, a cake outlet is coaxially mounted, and a cake outlet for slag material forming is opened at the center of the cake outlet.

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