A pressurized double-screw oil press

Abstract

The application provides a pressurized double-screw oil press, which comprises a press chamber and two press screws, the press chamber comprises a first press cage, a second press cage and a pressurized cavity which is sealed between the first press cage and the second press cage, the pressurized cavity comprises a sleeve, a cylinder and a pressurized cavity driving mechanism, the sleeve is provided with an 8-shaped cavity, the 8-shaped cavity comprises an upper cavity and a lower cavity which are connected, the inner diameters of the upper cavity and the lower cavity are greater than the diameter of the press screw and less than the inner diameters of the first press cage and the second press cage, the end of the sleeve is fixedly and sealingly connected with one of the press cages, the cylinder is rotatably installed outside the sleeve and forms an annular cavity with the sleeve, the two ends of the 8-shaped cavity are provided with openings for connecting the 8-shaped cavity with the annular cavity, and the pressurized cavity driving mechanism is connected with the cylinder and is used for driving the cylinder to rotate. The application can increase the pressure in the press cavity and has a positive transportation effect on the material embryo, thereby improving the pressing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of oil processing technology, specifically relating to a pressure-boosting double-screw oil press. Background Technology

[0002] A twin-screw oil press is a type of oil press with two opposing screws operating within the same pressing cage. It utilizes the squeezing force generated by the two opposing screws in conjunction with the cage's action to extract oil from the feed. The entire pressing process, from the feed entering the press to the output cake, is continuous. Common twin-screw oil presses typically employ a cylindrical pressing chamber and a twin-screw structure. Existing cylindrical pressing chambers are smooth, continuous cavities with a gradually decreasing chamber size. As the screw conveyor moves the feed forward, insufficient internal pressure within the continuous chamber leads to inefficient pressing of the feed at the edges, affecting the overall pressing efficiency. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a pressure-boosting double-screw oil press, which can increase the internal pressure of the pressing chamber during oil pressing and play a positive transport role for the material embryo, thereby improving the pressing efficiency.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A pressure-boosting double-screw oil press includes a pressing chamber and two screws arranged parallel to each other within the pressing chamber. The pressing chamber includes a first pressing cage connected to the feed inlet of the oil press, a second pressing cage connected to the slag outlet of the oil press, and a pressure-boosting chamber sealed between the first and second pressing cages. The pressure-boosting chamber includes a sleeve, a cylinder, and a pressure-boosting chamber drive mechanism. The sleeve has an 8-shaped cavity, which includes an upper cavity and a lower cavity that are connected. The inner diameters of the upper and lower cavities are both larger than the diameter of the screws and smaller than the inner diameters of the first and second pressing cages. The end of the sleeve is fixedly and sealed to one of the pressing cages. The cylinder is rotatably mounted outside the sleeve, and the gap between the cylinder and the sleeve forms an annular cavity. The two ends of the 8-shaped cavity have openings for communicating with the annular cavity. The pressure-boosting chamber drive mechanism is connected to the cylinder and is used to drive the cylinder to rotate.

[0006] Optionally, the inner wall of the cylinder is provided with several spiral grooves.

[0007] Optionally, the oil press also includes a scraper mechanism for cleaning the spiral groove, the scraper mechanism comprising:

[0008] Scraper housing, installed inside the sleeve;

[0009] The scraper assembly comprises several groups, installed within the scraper housing. Each scraper assembly includes two rack cavities corresponding to each spiral groove, a rack vertically disposed within each rack cavity, a gear disposed between and meshing with the two racks, and a scraper disposed at the bottom of each rack. The lower part of the scraper facing the inner wall of the spiral groove is a beveled surface. This beveled surface is used to move the corresponding scraper from inside the spiral groove to above the spiral groove when in contact with the inner wall of the spiral groove. The gear is used to move the other rack from above the spiral groove to inside the spiral groove when meshing with the upward-moving rack.

[0010] Optionally, the scraper is provided with a self-locking buckle above the oblique surface, and the rack cavity is provided with a buckle groove that matches the self-locking buckle. In the initial state, the lower ends of the two scrapers extend out of the scraper shell and sleeve and fall into the same spiral groove. The self-locking buckle disengages from the buckle groove when the oblique surface of the corresponding scraper first contacts the inner wall of the spiral groove and is subjected to force.

[0011] Optionally, the rack has a plurality of balls on its bottom outer periphery, and each rack cavity has a ball groove arranged vertically on its inner wall to match the balls. The rack has a support cavity at its bottom, and the scraper has a scraper support at its top. The top of the scraper support contacts the top of the support cavity. The diameter of the scraper support is smaller than the diameter of the support cavity, and the axial length of the scraper support is greater than the axial depth of the support cavity. The scraper and the rack are connected by a plurality of springs.

[0012] Optionally, the scraper housing and the sleeve are connected by a magnetic attraction structure.

[0013] Optionally, the inner wall of the cylinder is provided with several oil guide grooves along the axial direction.

[0014] Optionally, the booster chamber drive mechanism includes an external drive motor, an external drive shaft fixedly connected to the output shaft of the external drive motor, an external drive gear fixedly mounted on the external drive shaft, and an external gear ring located on the outer circumference of the cylinder and meshing with the external drive gear.

[0015] Optionally, the screw press located in the pressurization chamber is fitted with multiple shearing rings. The outer circumferential surface of the shearing rings is polygonal, and adjacent shearing rings are staggered at a certain angle.

[0016] Optionally, the oil press also includes an oil storage tank located below the pressing chamber, wherein the oil storage tank is provided with a filter screen and a layer of hydrophobic and oleophilic material from top to bottom.

[0017] The beneficial effects of this invention are as follows: By dividing the pressing chamber into three sections—the first pressing cage, the pressure-boosting chamber, and the second pressing cage—and designing the structure of the pressure-boosting chamber to reduce its inner cavity to a figure-eight shape, which is smaller than the dimensions of the two adjacent pressing cages, the material undergoes a sudden reduction in compression volume when it enters the pressure-boosting chamber, resulting in increased pressing pressure and thus improved pressing efficiency. Simultaneously, by controlling the rotational speed of the pressure-boosting chamber, the transport of the material can be accelerated or slowed down, effectively controlling the residence time of the material in the pressure-boosting chamber according to actual working conditions, further improving pressing efficiency. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the overall external structure of the pressure-boosting double-screw oil press provided by the present invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the overall external structure of the pressure-boosting double-screw oil press provided by the present invention. Figure 2 ;

[0021] Figure 3 This is a full sectional view of the first embodiment of the pressure-boosting double-screw oil press provided by the present invention;

[0022] Figure 4 This is a schematic diagram of the pressurization chamber in an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the sleeve structure in an embodiment of the present invention;

[0024] Figure 6 This is a full sectional view of the second embodiment of the pressure-boosting double-screw oil press provided by the present invention;

[0025] Figure 7 This is a schematic diagram of the pressurization chamber in the second embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the sleeve equipped with the scraper mechanism in the second embodiment of the present invention;

[0027] Figure 9 This is an external overall schematic diagram of the scraper mechanism in the second embodiment of the present invention;

[0028] Figure 10 This is a schematic diagram of the internal structure of the scraper mechanism in the second embodiment of the present invention;

[0029] Figure 11 This is a schematic diagram of the scraper shell structure in the second embodiment of the present invention;

[0030] Figure 12 This is a schematic diagram of the rack with a scraper installed in the second embodiment of the present invention;

[0031] Figure 13 This is a schematic diagram of the scraper structure in the second embodiment of the present invention;

[0032] Figure 14 This is a schematic diagram of the empty cavity structure in the second embodiment of the present invention;

[0033] Figure 15 This is a schematic diagram of the screw press structure in an embodiment of the present invention;

[0034] Figure 16 This is a schematic diagram of the structure of the oil residue cavity in an embodiment of the present invention;

[0035] Figure 17 This is a schematic diagram of the structure of an oil storage tank with an oleophilic and hydrophobic material layer in an embodiment of the present invention.

[0036] In the diagram: 1-Rear motor housing, 2-Feed inlet, 3-Bottom support of the pressing chamber, 4-Rear drive motor, 5-Oil storage tank, 5.1-Filter screen, 5.2-Hydrophobic and oleophilic material layer, 7-Outer wall connecting bracket, 8-External drive motor housing, 9-Pressure chamber drive mechanism, 9.1-External drive shaft, 9.2-External drive gear, 9.3-External gear ring, 11-Thrust bearing of the pressing chamber, 12-Pressing screw, 13-Pressing chamber, 14-First pressing cage, 15-Second pressing cage, 16-Pressure chamber, 17-Sleeve, 17.1-Figure-8 shaped cavity, 17.2-Upper cavity, 17.3-Lower cavity, 18 -Cylinder, 18.1-Oil guide groove, 19-Oil sludge box, 19.1-Mounting groove, 20-Spiral slide, 21-Scraper mechanism, 21.1-Scraper housing, 21.2-Scraper assembly, 21.3-Rack cavity, 21.4-Rack, 21.5-Gear, 21.6-Scraper, 21.7-Beveled surface, 21.8-Self-locking latch, 21.9-Latch groove, 21.11-Ball, 21.12-Ball groove, 21.13-Support cavity, 21.14-Scraper support, 21.15-Spring, 22-Shear ring, 23-Hydrophobic and oleophilic material layer. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0038] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., 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 do not 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. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" or "several" means two or more.

[0040] like Figures 1-5 As shown, the first embodiment of the present invention provides a pressure-boosting double-screw oil press, including a pressing chamber 13 and two screws 12 arranged parallel to each other within the pressing chamber 13. The pressing chamber 13 includes a first pressing cage 14 connected to the feed inlet of the oil press, a second pressing cage 15 connected to the slag outlet of the oil press, and a pressure-boosting chamber 16 sealed between the first and second pressing cages. The pressure-boosting chamber 16 includes a sleeve 17, a cylinder 18, and a pressure-boosting chamber drive mechanism 9. The sleeve 17 has an 8-shaped cavity 17.1, which includes an upper cavity 17.2 and a lower cavity 17.3 that are connected to each other. The inner diameters of the upper and lower cavities are both larger than the diameter of the screws and smaller than the inner diameters of the first and second pressing cages. The end of 17 is fixed and sealed to one of the pressing cages. The cylinder 18 is rotatably installed outside the sleeve 17, and the gap between the cylinder and the sleeve forms an annular cavity. The two ends of the figure-eight cavity are provided with openings for communicating with the annular cavity. The pressurizing chamber drive mechanism 9 is connected to the cylinder and is used to drive the cylinder to rotate. The pressurizing chamber drive mechanism 9 includes an external drive motor (installed in the external drive motor housing 8), an external drive shaft 9.1 fixedly connected to the output shaft of the external drive motor, an external drive gear 9.2 fixedly installed on the external drive shaft 9.1, and an external gear ring 9.3 located on the outer circumference of the cylinder and meshing with the external drive gear. The external drive gear 9.2 and the external gear ring 9.3 are both provided with protective shells.

[0041] In this embodiment of the invention, there are two drive systems, such as Figures 1-3As shown, these are the rear motor housing 1 and the external drive motor housing 8. The rear motor housing 1 is supported by the bottom bracket 3 of the pressing chamber, and the pressing screw 12 is driven by the rear drive motor 4 inside. In the external drive motor housing 8, the motor drives the external drive gear 9.2 to rotate the external gear ring 9.3, and the rotation of the external gear ring is achieved by the pressing chamber thrust bearing 11.

[0042] In this embodiment of the invention, a pressure-boosting chamber is set in the middle of the pressing chamber. The pressure-boosting chamber specifically includes a sleeve with an 8-shaped cavity, a cylinder, and a pressure-boosting chamber drive mechanism. The 8-shaped cavity is similar to the shape of an 8, with its upper and lower cavities connected, capable of accommodating two screw presses respectively. The 8-shaped cavity is also connected to an annular cavity. Material enters the first pressing cage through the feed inlet 2 and is conveyed forward under the rotation of the screw presses. When the material reaches the 8-shaped cavity, the internal pressure increases due to the sudden reduction in space, thereby improving pressing efficiency. Some material enters the annular cavity, which, during the rotation of the cylinder, drives the material within the annular cavity to be transported forward. Furthermore, the rotation speed of the cylinder can be adjusted to control the residence time of the material in the pressure-boosting chamber, further improving pressing efficiency. In this embodiment, the sleeve is connected to the oil residue box of the second pressing cage. For ease of connection, as shown... Figure 16 As shown, the inner and outer periphery of the oil residue box are provided with several mounting grooves 19.1, and the outer periphery of the sleeve is provided with corresponding protrusions.

[0043] In one embodiment, such as Figure 4 , Figure 7 As shown, several spiral grooves 20 are installed on the inner wall of the cylinder 18. The spiral grooves rotate together with the cylinder, which can propel the material in a positive direction and discharge it into the oil residue box 19.

[0044] The second embodiment of the present invention provides a pressure-boosting double-screw oil press, such as... Figures 4-14 As shown, the oil press also includes a scraper mechanism 21 for cleaning the spiral groove. The scraper mechanism 21 includes: a scraper shell 21.1, installed in the sleeve 18; and scraper assemblies 21.2, which are provided in several groups and installed in the scraper shell 21.1. Each scraper assembly 21.2 includes two rack cavities 21.3 corresponding to each spiral groove, racks 21.4 vertically arranged in each rack cavity, a gear 21.5 arranged between the two racks 21.4 and meshing with the two racks, and a scraper 21.6 arranged at the bottom of each rack. The lower part of the scraper facing the inner wall of the spiral groove is a beveled surface 21.7. This beveled surface is used to drive the corresponding scraper to move upward from inside the spiral groove to above the spiral groove when it contacts the inner wall of the spiral groove. The gear 21.5 is used to drive the other rack to move downward from above the spiral groove to inside the spiral groove when it meshes with the upward-moving rack.

[0045] Considering that material may get stuck in the spiral chute when it is fed forward as the cylinder rotates, the second embodiment of the present invention designs a scraper mechanism that allows the force acting on the scraper's inclined surface to suspend the scraper above the inner spiral, so that the scraper can pass over the spiral to perform a cleaning function and prevent material from getting stuck in the spiral chute.

[0046] The working principle of the scraper mechanism is as follows: The scraper is driven by the force exerted by the spiral groove on its inclined surface. The inclined surface ensures that the scraper contacts the spiral groove without interfering with it, and the oblique force can be decomposed into a horizontal force and an upward force. When one scraper is struck, it moves upward due to the upward force, and the gear rotates, causing the other scraper to move downward. The inclined surface of the other scraper contacts the spiral groove and moves upward, causing the first scraper to move downward. This process repeats, achieving automatic raising and lowering of the two scrapers and continuously cleaning the spiral groove. The scraper housing is used to prevent the gears from being exposed.

[0047] In one embodiment, such as Figures 10-13 As shown, a self-locking latch 21.8 is provided on the scraper 21.6 above the oblique cut surface 21.7. A latch groove 21.9, configured with the self-locking latch 21.8, is provided in the rack cavity 21.3. In the initial state, the lower ends of both scrapers extend beyond the scraper housing and sleeve and fall into the same spiral groove. The self-locking latch disengages from the latch groove when the oblique cut surface of the corresponding scraper first contacts the inner wall of the spiral groove under force. By setting the self-locking latch so that it is initially located within the latch groove, all scrapers are vertically limited and set at the same height in the initial state, making them less likely to be pushed up by the hard residue after pressing, thus achieving a strong cleaning effect and facilitating installation. After the oil press enters the working state, the self-locking latch disengages from the latch groove, and the scraper mechanism works stably and orderly. If a problem occurs, the scraper mechanism can be manually adjusted back to the initial state where the self-locking latch is located within the latch groove.

[0048] Considering that the scraper will move laterally when the self-locking latch disengages from the latch slot, therefore, in one embodiment, as... Figure 10 , Figure 12 , Figure 14As shown, the rack 21.4 has several balls 21.11 on its bottom outer periphery. Each rack cavity has a ball groove 21.12 arranged vertically on its inner wall to match the balls. The bottom of the rack has a support cavity 21.13, and the top of the scraper has a scraper support 21.14. The top of the scraper support contacts the top of the support cavity. The diameter of the scraper support is smaller than the diameter of the support cavity, and the axial length of the scraper support is greater than the axial depth of the support cavity. The scraper and the rack are connected by multiple springs 21.5. By setting the balls to move vertically within the ball grooves, the rack can be moved vertically. The ball grooves serve both a limiting function and facilitate installation. By setting scraper supports and scraper cavities of varying diameters, along with springs, the scraper can have horizontal movement space while the rack remains vertical. After the self-locking latch disengages from the locking slot, the scraper support column, due to the gap between it and the support cavity, can move horizontally within the cavity. Simultaneously, the scraper support column, in contact with the top of the cavity, lifts the rack, causing it to move upwards. This movement drives the balls upwards within their grooves, stretching the welded spring. Ultimately, this engages the rack and gear, suspending the scraper above the internal spiral. When this process occurs with the next scraper, the same process causes the gear to depress the previous scraper through engagement, and then the spring's torsional force resets it, thus achieving the adaptive scraper lifting and lowering process.

[0049] In one embodiment, such as Figure 8 As shown, the scraper housing and the sleeve are connected by a magnetic structure, which facilitates maintenance and disassembly.

[0050] In one embodiment, such as Figure 7 As shown, the inner wall of the cylinder 18 is provided with several oil guide grooves 18.1 along the axial direction, which can guide the pressed oil.

[0051] In one embodiment, such as Figure 6 , Figure 15 As shown, the screw press located within the pressure chamber is fitted with multiple shearing rings 22. The outer circumference of each shearing ring is polygonal, and adjacent shearing rings are staggered at a certain angle. These staggered shearing rings increase pressure, allowing for smooth crushing of harder materials such as peanuts, thereby improving pressing efficiency. This invention designs a novel shearing screw press, installing multiple shearing pressure-increasing rings on the screw. These shearing pressure-increasing rings are preferably regular polygons, which can efficiently increase pressure and shear harder materials such as peanuts and soybeans. Screw presses with shearing rings at different angles can also be used to improve pressing efficiency when pressing softer materials such as sesame seeds. Structurally, the shearing pressure-increasing rings not only increase pressure but also provide forward transport. When working in conjunction with the shearing pressure-increasing rings, the space utilization of the pressing chamber and the oil yield of the oil press can be greatly increased.

[0052] In this embodiment, five regular hexagonal shearing rings are selected and driven by a motor. When pressing hard materials such as peanuts, the shearing and pressure-increasing rings can increase the pressure and thus improve the pressing efficiency. The angle between adjacent shearing rings can be determined according to the specific material and can be any angle between 1° and 15°.

[0053] In one embodiment, such as Figure 1 , Figure 2 , Figure 17 As shown, the oil press also includes an oil storage tank 5 with a filtration function located below the pressing chamber. The oil storage tank contains a filter screen 5.1 and a hydrophobic and oleophilic material layer 5.2 arranged from top to bottom. This application designs an oil storage tank with graded filtration: the oil storage tank adopts a graded structure, with the first layer of filter screen used to filter residue, and the second layer of hydrophobic and oleophilic material with filtration effect. It filters residue first, then water. It also adopts a detachable structure for easy cleaning of oil residue and replacement of the hydrophobic and oleophilic material.

[0054] This invention optimizes the basic structure of the double-screw oil press, and designs a new shearing screw and a press chamber. It is divided into three parts: feeding and conveying, pressurizing and shearing, and discharging and conveying. The auger blades in the conveying part are larger, providing stronger conveying force and greater lateral pressure. The pressurizing and shearing part consists of a pressurizing and shearing ring and a specially designed pressurizing chamber. The auger blades in the discharging and conveying part are smaller, which facilitates the transport of materials after pressing.

[0055] The three parts of this invention work as follows: 1. Feeding and conveying section: The material enters through the feed inlet on the side of the oil press. After entering the pressing chamber, the material is transported and accumulated at the same time. When it reaches the pressurizing chamber, there is already a large internal pressure inside the material, which is ready for shearing and pressing. 2. Shearing and pressing section: The material enters the pressurizing chamber from the material conveying section at a slower speed. Because the material occupies more space in the pressurizing chamber and the material conveying section than in the shearing and pressurizing section, the material is not only pressurized but also sheared in this section, which greatly increases the oil yield. Moreover, because the pressurizing section of the pressing chamber has a positive material conveying function, the possibility of material getting stuck in the pressurizing and shearing section is very small. Under the pushing of the material behind and the positive material conveying function, the material will be smoothly discharged from the shearing and pressurizing section after being sheared and pressed by high pressure. 3. Discharge and conveying section: After the material is discharged from the shearing and pressing section, it falls into the discharge and conveying section. The discharge and conveying section is short and the auger blades are small, which makes it easy to clean, has low cost, and high transportation efficiency. It will not put too much pressure on the material and affect the discharge efficiency.

[0056] The core of this invention lies in a pressurizing chamber with a forward transport and pressurization section. This pressurizing section is located on the pressing chamber, its inner diameter tapering in a curved shape. A thrust bearing is located on each of the left and right sides. When the external gear of the pressing chamber pushes the external gear ring, this specially designed pressurizing chamber can rotate. The spiral grooves on the inner wall drive the material forward and enhance the shearing effect. This section's inner wall, near the discharge section, has a pressurizing part, ensuring that the material can be fully pressed and sheared in the pressurizing section. The pressing time can also be effectively controlled by adjusting the rotation speed of the spiral grooves. The pressurizing chamber also features a self-locking scraper to remove material accumulated inside the spiral. One side of the scraper is inclined. When the internal spiral feeds forward, the force acting on the inclined surface of the scraper causes it to suspend above the internal spiral, allowing the scraper to pass over the spiral for cleaning.

[0057] When the invention is in operation, the material enters the pressing chamber 13, which is fixed by the outer wall connecting bracket 7, through the upper feed port 2. After the first pressing cage advances a certain distance, it reaches the pressurizing chamber. At this time, the material is efficiently sheared and pressed by the pressurizing chamber and the shearing pressurizing ring. The pressurizing chamber compresses the material in a small space. The material is sheared by the regular hexagonal edges arranged at different angles while being transported to the second pressing cage 15 under the forward propulsion of the spiral chute and finally discharged into the oil residue box 19. A scraper mechanism is also provided in the pressurizing chamber to prevent the spiral chute from jamming in the pressurizing part. The pressed oil is collected by the oil storage tank. The oil will first pass through the filter screen, then through the hydrophobic and oleophilic material, and finally be stored in the oil storage tank.

[0058] This invention has the following advantages:

[0059] 1. The pressurization chamber specially designed in this invention can effectively increase space utilization and improve pressing efficiency;

[0060] 2. The pressing method of this invention is reasonable and effective, and has a simple structural layout, making it widely applicable to oil extraction from various hard materials;

[0061] 3. According to the different pressing quality requirements and working conditions, the shearing and pressurizing ring screw of the present invention can be replaced with different angles to achieve better pressing effect;

[0062] 4. This invention can adjust the speed of the gears externally to change the speed at which the material advances in the pressurizing section of the pressing chamber, thereby improving the pressing quality;

[0063] 5. The oil storage tank of the present invention adopts a multi-stage structure, which has a high filtration efficiency and makes it more convenient to replace and clean the internal filter screen and cleaning material.

[0064] 6. In this invention, the pressing chambers of the oil press are all connected by multiple rods, which makes it more convenient to replace and clean the screw shearing and pressing rings and the press chamber pressurization part.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all fall within the protection scope of the appended claims of the present invention.

Claims

1. A pressure-boosting double-screw oil press, comprising a pressing chamber and two screws arranged parallel to each other within the pressing chamber, characterized in that, The pressing chamber includes a first pressing cage connected to the feed inlet of the oil press, a second pressing cage connected to the slag outlet of the oil press, and a pressurizing chamber sealed between the first and second pressing cages. The pressurizing chamber includes a sleeve, a cylinder, and a pressurizing chamber drive mechanism. The sleeve has an 8-shaped cavity, comprising an upper cavity and a lower cavity that are connected. The inner diameters of the upper and lower cavities are both larger than the diameter of the screw press and smaller than the inner diameters of the first and second pressing cages. The end of the sleeve is fixedly and sealed to one of the pressing cages. The cylinder is rotatably mounted outside the sleeve, and the gap between the cylinder and the sleeve forms an annular cavity. The two ends of the 8-shaped cavity have openings for communication between the 8-shaped cavity and the annular cavity. Several spiral grooves are installed on the inner wall of the cylinder. The pressurizing chamber drive mechanism is connected to the cylinder and… The oil press also includes a scraper mechanism for cleaning the spiral groove, which is used to drive the cylinder to rotate. The scraper mechanism includes a scraper shell and a scraper assembly. The scraper shell is installed in a sleeve. The scraper assembly is provided in several groups and installed in the scraper shell. Each scraper assembly includes two rack cavities corresponding to each spiral groove, a rack vertically arranged in each rack cavity, a gear arranged between the two racks and meshing with the two racks, and a scraper arranged at the bottom of each rack. The lower part of the scraper facing the inner wall of the spiral groove is a beveled surface. This beveled surface is used to drive the corresponding scraper to move from inside the spiral groove to above the spiral groove when it contacts the inner wall of the spiral groove. The gear is used to drive the other rack to move from above the spiral groove to inside the spiral groove when it meshes with the rack that moves upward.

2. The pressure-boosting double-screw oil press according to claim 1, characterized in that, The scraper is provided with a self-locking buckle above the oblique cut surface. The rack cavity is provided with a buckle groove that matches the self-locking buckle. In the initial state, the lower ends of the two scrapers extend out of the scraper shell and sleeve and fall into the same spiral groove. The self-locking buckle disengages from the buckle groove when the oblique cut surface of the corresponding scraper first contacts the inner wall of the spiral groove and is subjected to force.

3. The pressure-boosting double-screw oil press according to claim 1 or 2, characterized in that, The rack has several balls on its bottom outer periphery. Each rack cavity has a ball groove on its inner wall in the vertical direction that matches the balls. The rack has a support cavity at its bottom and a scraper support at its top. The top of the scraper support contacts the top of the support cavity. The diameter of the scraper support is smaller than the diameter of the support cavity, and the axial length of the scraper support is greater than the axial depth of the support cavity. The scraper and the rack are connected by multiple springs.

4. The pressure-boosting double-screw oil press according to claim 1, characterized in that, The scraper shell and the sleeve are connected by a magnetic attraction structure.

5. The pressure-boosting double-screw oil press according to claim 1, characterized in that, The inner wall of the cylinder is provided with several oil guide grooves along the axial direction.

6. The pressure-boosting double-screw oil press according to claim 1, characterized in that, The booster chamber drive mechanism includes an external drive motor, an external drive shaft fixedly connected to the output shaft of the external drive motor, an external drive gear fixedly mounted on the external drive shaft, and an external gear ring located on the outer circumference of the cylinder and meshing with the external drive gear.

7. The pressure-boosting double-screw oil press according to claim 1, characterized in that, The screw press located in the pressurization chamber is fitted with multiple shearing rings. The outer circumferential surface of the shearing rings is polygonal, and adjacent shearing rings are staggered at a certain angle.

8. The pressure-boosting double-screw oil press according to claim 1, characterized in that, The oil press also includes an oil storage tank located below the pressing chamber, and the oil storage tank is equipped with a filter screen and a layer of hydrophobic and oleophilic material from top to bottom.

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