A vegetable oil pressing equipment and pressing process

Abstract

This invention relates to the field of vegetable oil pressing technology, and particularly to a vegetable oil pressing device and pressing process. The vegetable oil pressing device includes a base, an oil pressing unit in the middle of the base, an oil receiving tray above the oil pressing unit, and a material cylinder above the oil receiving tray. Oil discharge grooves are evenly distributed on the side wall of the material cylinder. Columns are installed on both sides of the base, and a sealing unit is installed between the two columns. This invention allows for flexible selection of single axial pressing or axial-radial combined pressing according to the characteristics of different raw materials. Through switchable pressing modes, on-demand pressure is achieved, optimizing operating costs. When the cylindrical press head protrudes, it can apply not only axial pressure from the bottom but also radial pressure from inside the raw material simultaneously, thus forming a composite pressure field and effectively solving the problem of uneven pressure between the center and edge of traditional hydraulic presses.

Description

Technical Field

[0001] This invention relates to the field of vegetable oil pressing technology, and in particular to a vegetable oil pressing equipment and pressing process. Background Technology

[0002] Hydraulic oil presses are an important piece of equipment in the oil industry. The frictional heat they generate is much lower than that of screw oil presses, enabling low-temperature pressing and preserving the natural flavor, color, nutrients, and bioactive substances of the oil to the greatest extent. They are suitable for the production of specialty oils such as olive oil and sesame oil, as well as high-grade edible oils.

[0003] Although hydraulic oil presses have the above advantages, they generate static pressure during operation. The pressure is transmitted through the solid cake, and it decreases as it is transmitted from the center to the edge, resulting in uneven pressure between the center and the edge. Consequently, the oil in these areas cannot be effectively squeezed out.

[0004] Furthermore, as pressing proceeds, the oil needs to flow horizontally towards the edge of the cake to be discharged. This path is long and has great resistance. In addition, fine particles in the oilseeds will flow with the oil and gradually accumulate and dry at the end or gap of the oil discharge channel, thus blocking the channel. This prevents the oil inside the cake from being discharged in time, creating reverse pressure that cancels out the external pressure and further affects the oil yield.

[0005] In response, some manufacturers have chosen to design the inner wall of the press cylinder as a conical structure. While axially compressing the raw material, radial pressure is applied to the raw material through the conical inner wall. Although this method can improve the oil yield to a certain extent, it is necessary to overcome the huge frictional and compression resistance generated by the conical press cylinder when pushing the material. The hydraulic system needs to provide greater thrust, which leads to increased operating costs. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a vegetable oil pressing device and pressing process to solve the technical problems existing in the prior art. The vegetable oil pressing device includes a base, an oil pressing unit is arranged in the middle of the base, an oil receiving tray is arranged above the oil pressing unit, a material cylinder is arranged above the oil receiving tray, oil discharge grooves are evenly opened on the side wall of the material cylinder, columns are installed on both sides of the base, and a sealing unit is installed between the two columns.

[0007] The oil pressing unit includes an installation cylinder, an annular pressure head located inside the installation cylinder, and a cylindrical pressure head that slides and seals with the annular pressure head. The installation cylinder is fixedly installed on the base, and the annular pressure head and the cylindrical pressure head are driven by drive component one and drive component two, respectively.

[0008] The annular pressure head is equipped with an auxiliary oil discharge mechanism to increase the oil discharge channel, and the cylindrical pressure head is equipped with a pressurizing mechanism to apply radial pressure to the raw material.

[0009] When the annular pressure head is flush with the upper surface of the cylindrical pressure head, only the material is subjected to axial compression. When the upper surface of the cylindrical pressure head is higher than the upper surface of the annular pressure head, the cylindrical pressure head is inserted into the middle of the material, which can simultaneously perform axial and radial compression on the material.

[0010] The enclosed unit includes an upper top plate, a limiting nut threaded onto the top of the column, and a limiting plate fixedly installed between two columns. The limiting plate has a circular hole in the middle, and a pad is placed inside the circular hole. The pad is equipped with a grooving mechanism for pressing out annular grooves above the raw material.

[0011] Preferably, the pressurizing mechanism includes multiple circumferentially evenly spaced grooves on the sidewall of the cylindrical press head, a lifting groove in the middle of the cylindrical press head that communicates with all the grooves, an arc-shaped plate horizontally and slidably installed in the groove, a lifting rod vertically and slidably installed in the lifting groove, a supporting spring connecting the lifting rod and the lifting groove, two conical surfaces on the sidewall of the lifting rod, and a pressure-bearing surface on the inner wall of the arc-shaped plate that corresponds to the conical surface, the pressure-bearing surface and the conical surface being slidably connected.

[0012] Preferably, the pressing mechanism includes two concentric annular grooves on the pad, an annular plate is slidably installed in the annular grooves, and a plurality of drive grooves communicating with the annular grooves are opened at the upper end of the annular grooves. A piston rod is slidably installed in each drive groove, and the lower end of the piston rod is fixedly connected to the upper end of the annular plate.

[0013] An annular air supply chamber is provided at the lower end of the top plate. An air vent is provided at the rear side of the air supply chamber and is connected to an external air pump. Lifting rings are slidably installed on both the inner and outer annular sidewalls of the air supply chamber. A sealing ring is fixedly installed at the lower end of the lifting ring. An isolation ring is provided on the side of the lifting ring near the air supply chamber. A helical spring is connected between the isolation ring and the lifting ring. A connecting hole is horizontally opened on the isolation ring. The side of the lifting ring facing the connecting hole is a sloping structure.

[0014] Preferably, the cylindrical pressure head has multiple mating grooves evenly distributed around its sidewall, each corresponding to a sliding groove and located below the sliding groove. Inclined guide grooves are provided on both sides of the mating grooves along their width direction. Guide rods are slidably installed in the guide grooves. Telescopic plates are fixedly installed between the guide rods on both sides. The telescopic plates are horizontally slidably fitted onto the fixed rods. The fixed rods are fixedly connected to the sidewall of the cylindrical pressure head. The inner side of the upper end of the annular pressure head has clearance grooves corresponding to the telescopic plates. Multiple protrusions corresponding to the telescopic plates are evenly fixedly installed around the upper end of the cylindrical pressure head.

[0015] Preferably, the auxiliary oil discharge mechanism includes a plurality of oil guide grooves radially distributed on the upper surface of the annular pressure head. The lower end of the oil guide groove is gradually inclined downward from the inside to the outside. An extension groove communicating with the lower side of the end of the oil guide groove away from the axis of the annular pressure head is provided. The extension groove penetrates the outer wall of the annular pressure head.

[0016] Preferably, the driving component includes a plurality of hydraulic cylinders fixedly installed inside the mounting cylinder, the telescopic end of the hydraulic cylinders being fixedly connected to the lower end of the annular pressure head, and the plurality of hydraulic cylinders being symmetrically distributed on both sides of the annular pressure head.

[0017] Preferably, the second driving component includes a second hydraulic cylinder rotatably installed inside the mounting cylinder, the fixed end of the second hydraulic cylinder being fixedly connected to the output shaft of the drive motor, and the telescopic end of the second hydraulic cylinder being fixedly connected to the lower end of the cylindrical pressure head.

[0018] Preferably, the auxiliary oil discharge mechanism further includes a sliding groove connected to the avoidance groove on the inner side of the annular pressure head. The sliding groove is inverted L-shaped. A sealing block is horizontally and slidably installed in the horizontal section of the sliding groove. A sliding frame is fixedly installed at the lower end of the sealing block. The sliding frame is horizontally and slidably installed in the vertical section of the sliding groove. A connecting rod is hinged to the lower end of the sliding frame. The end of the connecting rod away from the sliding frame is hinged to the turntable. The turntable is vertically and slidably connected to the two extension ends of the hydraulic cylinder. The upper end of the turntable is rotatably connected to the lower end of the annular pressure head through an annular plate.

[0019] The present invention also provides a preferred embodiment of a vegetable oil pressing process, which is completed in conjunction with the above-mentioned vegetable oil pressing equipment, including the following steps: S1, putting the raw material into a filter bag, then putting the filter bag into a material cylinder, and sealing the upper end of the material cylinder by means of the top plate and the pad plate.

[0020] S2. An annular groove is pressed into the upper end of the filter bag by the pressing mechanism to increase the oil discharge channel.

[0021] S3. Start the oil pressing unit. According to the type of raw material, the raw material is pressed and the pressed oil flows out from the oil discharge tank and into the oil receiving tray.

[0022] S4. Remove the top plate and pad, and take the filter bag out of the material cylinder.

[0023] As can be seen from the above technical solutions, the vegetable oil pressing equipment and pressing process designed in this invention have the following beneficial effects: 1. This invention can flexibly select single axial pressing or axial-radial compound pressing according to the characteristics of different raw materials. Through the switchable pressing mode, it can achieve on-demand pressing and optimize operating costs. When the cylindrical press head protrudes, it can not only apply axial pressure from the bottom, but also apply radial pressure from the inside of the raw material at the same time, thereby forming a compound pressure field, which effectively solves the problem of uneven pressure between the center and the edge of the traditional hydraulic press.

[0024] 2. In this invention, the periodic extension of the arc plate in the pressurizing mechanism can not only compress the raw material in the radial direction, but also clear the formed oil discharge channel, break the blockage caused by particle accumulation, reduce the reverse pressure of oil discharge, and thus effectively improve the oil yield.

[0025] 3. The present invention pre-presses an annular groove on the top of the raw material through a pressing mechanism, which provides a shorter oil discharge path for the oil extracted from the central area of ​​the raw material, greatly shortening the distance of the oil flowing from the center to the oil discharge groove on the side wall of the barrel and reducing the flow resistance.

[0026] 4. The present invention provides an efficient and smooth flow channel for the grease squeezed from the bottom through the radial oil guide groove and extension groove at the top of the annular pressure head, which guides part of the grease directly to the oil discharge groove, avoiding the grease from spreading and stagnating on the surface of the pressure head, and further preventing blockage. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0029] Figure 2 This is a three-dimensional structural diagram of the present invention after removing some of the structure.

[0030] Figure 3 This is a schematic diagram of the internal structure of the present invention.

[0031] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0032] Figure 5 yes Figure 3 Enlarged view of point B in the middle.

[0033] Figure 6 This is a three-dimensional structural diagram of the cylindrical indenter extending from the annular indenter.

[0034] Figure 7 yes Figure 6 A magnified view of point C in the middle.

[0035] Figure 8 This is a three-dimensional structural diagram of the cylindrical indenter when it does not extend beyond the annular indenter.

[0036] Figure 9 It is a side sectional view of the sealing block, sliding frame, etc.

[0037] Figure 10 It is a top view of the sliding frame, connecting rod, turntable, etc.

[0038] Figure 11 This is a three-dimensional structural diagram of the top plate.

[0039] Figure 12 This is a top-view 3D structural diagram of the pad.

[0040] Figure 13 This is a bottom-view 3D structural diagram of the pad.

[0041] Reference numerals: 1. Base; 2. Oil pressing unit; 21. Mounting cylinder; 22. Annular press head; 221. Alternating groove; 23. Columnar press head; 231. Fitting groove; 232. Guide rod; 233. Telescopic plate; 234. Fixing rod; 235. Protrusion; 24. Auxiliary oil discharge mechanism; 241. Oil guide groove; 242. Extension groove; 243. Sealing block; 244. Sliding frame; 245. Connecting rod; 246. Turntable; 25. Pressurizing mechanism; 2 51. Arc-shaped plate; 252. Lifting rod; 3. Oil receiving tray; 4. Material cylinder; 41. Oil discharge groove; 5. Column; 6. Enclosure unit; 61. Top plate; 62. Limit nut; 63. Limiting plate; 64. Pad; 65. Grooving mechanism; 651. Ring plate; 652. Piston rod; 653. Air supply chamber; 654. Lifting ring; 655. Sealing ring; 656. Isolation ring; 657. Connecting hole; 7. Hydraulic cylinder one; 8. Hydraulic cylinder two. Detailed Implementation

[0042] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely 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.

[0043] See Figure 1 and Figure 2 A vegetable oil pressing device includes a base 1, an oil pressing unit 2 in the middle of the base 1, an oil receiving tray 3 above the oil pressing unit 2, a material cylinder 4 above the oil receiving tray 3, oil discharge grooves 41 evenly opened on the side wall of the material cylinder 4, and a reinforcing ring fixedly installed on the outer wall of the material cylinder 4 to improve the structural strength. Columns 5 are installed on both sides of the base 1, and a sealing unit 6 is installed between the two columns 5.

[0044] Place an appropriate amount of raw material into the filter bag, then place the filter bag into the material cylinder 4. Next, seal the top of the material cylinder 4 through the sealing unit 6. Then, start the oil pressing unit 2 to extract the oil from the raw material. The oil flows into the oil receiving tray 3 through the oil discharge trough 41. After the oil pressing is completed, first release the sealing effect of the sealing unit 6 on the material cylinder 4, and then take out the filter bag containing the raw material oil residue.

[0045] See Figures 1-4 , Figure 6 and Figure 8The oil pressing unit 2 includes an installation cylinder 21, an annular pressure head 22 located inside the installation cylinder 21, and a cylindrical pressure head 23 that slides and seals with the annular pressure head 22. The installation cylinder 21 is fixedly installed on the base 1. The annular pressure head 22 and the cylindrical pressure head 23 are driven by a driving component one and a driving component two, respectively. The annular pressure head 22 is provided with an auxiliary oil discharge mechanism 24 for increasing the oil discharge channel, and the cylindrical pressure head 23 is provided with a pressure-applying mechanism 25 for applying radial pressure to the raw material.

[0046] When the annular pressure head 22 is flush with the upper end face of the cylindrical pressure head 23, only the material is subjected to axial extrusion. When the upper end face of the cylindrical pressure head 23 is higher than the upper end face of the annular pressure head 22, the cylindrical pressure head 23 is inserted into the middle of the material, which can simultaneously perform axial and radial extrusion on the material.

[0047] See Figure 1 and Figure 3 The enclosed unit 6 includes an upper top plate 61, a limiting nut 62 threaded onto the top of the column 5, and a limiting plate 63 fixedly installed between the two columns 5. One end of the upper top plate 61 is rotatably connected to one of the columns 5, and the other end is snapped into the other column 5. The upper top plate 61 is located below the limiting nut 62, and the limiting plate 63 is located below the upper top plate 61. A circular hole is opened in the middle of the limiting plate 63, and a pad 64 is placed in the circular hole. A grooving mechanism 65 for pressing out an annular groove above the raw material is provided on the pad 64.

[0048] See Figure 3 , Figure 5 , Figure 11 , Figure 12 and Figure 13 The pressing mechanism 65 includes two concentric annular grooves on the pad 64. An annular plate 651 is slidably installed in the annular grooves. Multiple drive grooves communicating with the annular grooves are opened at the upper end of the annular grooves. A piston rod 652 is slidably installed in each drive groove. The lower end of the piston rod 652 is fixedly connected to the upper end of the annular plate 651. An annular air supply chamber 653 is opened at the lower end of the upper top plate 61. An air vent is opened on the rear side of the air supply chamber 653. The air vent is connected to an external air pump. Lifting rings 654 are slidably installed on the inner and outer annular sidewalls of the air supply chamber 653. A sealing ring 655 is fixedly installed at the lower end of the lifting ring 654. An isolation ring 656 is provided on the side of the lifting ring 654 near the air supply chamber 653. A helical spring is connected between the isolation ring 656 and the lifting ring 654. A connecting hole 657 is horizontally opened through the isolation ring 656. The side of the lifting ring 654 facing the connecting hole 657 is a sloping structure.

[0049] Initially, the lower end face of the sealing ring 655 is higher than the lower end face of the upper top plate 61 to prevent wear of the sealing ring 655 during the rotation of the upper top plate 61. After the filter bag containing the raw material is placed into the material cylinder 4, the pad 64 is placed in the round hole of the limiting plate 63, and then the upper top plate 61 is manually rotated into place so that the air supply chamber 653 is directly above the two annular grooves. Then, the air inlet is connected to the external air pump, the air pump is started, and air is supplied into the air supply chamber 653. The gas is blown through the connecting hole 657 to the inclined surface of the lifting ring 654 and exerts a downward thrust on the lifting ring 654, causing the lifting ring 654 to drive the sealing ring 655 to move downward until the lower end of the sealing ring 655 contacts the upper end of the pad 64, thereby preventing gas from overflowing from between the upper top plate 61 and the pad 64.

[0050] At the same time, the gas introduced into the air supply chamber 653 exerts a downward thrust on the piston rod 652. Multiple piston rods 652 together drive the corresponding annular plate 651 to move downward, so that the lower end of the annular plate 651 squeezes the raw material in the filter bag and presses out two annular grooves at the upper end of the filter bag. In the subsequent pressing process, these two annular grooves can serve as oil discharge channels for the oil extracted from the raw material near the center of the filter bag, shortening the oil discharge path and accelerating the oil pressing efficiency.

[0051] After the annular groove is pressed out, the pressure is maintained for a period of time, and then the gas in the air supply chamber 653 is extracted by an external air pump to reset the annular plate 651.

[0052] See Figure 3 and Figure 4 The pressurizing mechanism 25 includes multiple circumferentially evenly opened sliding grooves on the side wall of the cylindrical press head 23. A lifting groove is opened in the middle of the cylindrical press head 23, which is connected to the multiple sliding grooves. An arc plate 251 is horizontally slidably and sealed in the sliding groove. A lifting rod 252 is elastically slidably installed in the lifting groove. A support spring is connected between the lifting rod 252 and the lifting groove. The side wall of the lifting rod 252 is provided with two conical surfaces, and the inner wall of the arc plate 251 is provided with a pressure-bearing surface that corresponds to the conical surface. The pressure-bearing surface is slidably connected to the conical surface.

[0053] See Figure 1 , Figure 3 , Figure 4 and Figure 6The cylindrical pressure head 23 has multiple mating grooves 231 evenly distributed around its sidewall. Each mating groove 231 corresponds to a sliding groove and is located below the sliding groove. Inclined guide grooves are provided on both sides of the mating grooves 231 along their width direction. Guide rods 232 are slidably installed in the guide grooves. Telescopic plates 233 are fixedly installed between the guide rods 232 on both sides. The telescopic plates 233 are horizontally slidably sleeved on the fixed rods 234. The fixed rods 234 are fixedly connected to the sidewall of the cylindrical pressure head 23. The inner side of the upper end of the annular pressure head 22 has a relief groove 221 corresponding to the telescopic plates 233. Multiple protrusions 235 corresponding to the telescopic plates 233 are evenly fixedly installed around the upper end of the cylindrical pressure head 23.

[0054] It should be noted that, in order to prevent grease from entering the gap between the telescopic plate 233 and the fixed rod 234, a storage groove corresponding to the telescopic plate 233 is provided on the side wall of the cylindrical pressure head 23. The end of the telescopic plate 233 near the axis of the cylindrical pressure head 23 is slidably and sealed to the storage groove.

[0055] See Figure 3 , Figure 6 and Figure 7 The auxiliary oil discharge mechanism 24 includes a plurality of oil guide grooves 241 radially distributed on the upper end face of the annular pressure head 22. The lower end of the oil guide grooves 241 is gradually inclined downward from the inside to the outside. An extension groove 242 communicating with the lower side of the end of the oil guide groove 241 away from the axis of the annular pressure head 22 is provided. The extension groove 242 penetrates the outer wall of the annular pressure head 22.

[0056] See Figure 2 and Figure 3 The driving component includes a plurality of hydraulic cylinders 7 fixedly installed inside the mounting cylinder 21. The telescopic ends of the hydraulic cylinders 7 are fixedly connected to the lower end of the annular pressure head 22. The plurality of hydraulic cylinders 7 are symmetrically distributed on both sides of the annular pressure head 22.

[0057] See Figure 2 and Figure 3 The second driving component includes a second hydraulic cylinder 8 rotatably installed inside the mounting cylinder 21. The fixed end of the second hydraulic cylinder 8 is fixedly connected to the output shaft of the drive motor (not shown in the figure). The drive motor can be fixedly installed inside the mounting cylinder 21 through a motor base. The telescopic end of the second hydraulic cylinder 8 is fixedly connected to the lower end of the cylindrical pressure head 23.

[0058] Initially, the cylindrical pressure head 23 is located above the annular pressure head 22. When it is necessary to compress the raw material axially and radially, the position of the cylindrical pressure head 23 is adjusted by the drive motor so that the telescopic plate 233 and the clearance groove 221 are staggered in the circumferential direction. After the filter bag containing the raw material is placed into the material cylinder 4, the cylindrical pressure head 23 compresses the middle of the filter bag from below, so that the raw material in the filter bag is concave downwards. The pressure is low at this stage (1-3MPa), and the main purpose is to fill the space of the material cylinder 4 and remove most of the air.

[0059] When hydraulic cylinder 7 is started, the annular pressure head 22 axially squeezes the raw material from the bottom, applying a stable axial main pressure to the entire raw material. The pressure is slowly increased in stages to the maximum working pressure (e.g., 20-40 MPa, depending on the specific raw material). Some of the squeezed oil flows from the concave part in the middle of the raw material to the top of the annular pressure head 22, and flows along the upper end face of the annular pressure head 22 to the oil discharge groove 41. This increases the discharge path of the oil, reduces the flow resistance of the oil, and increases the oil discharge speed, thereby improving the overall oil pressing efficiency.

[0060] When the annular pressure head 22 moves below the telescopic plate 233, the annular pressure head 22 pushes the telescopic plate 233 upward. The telescopic plate 233 drives the lifting rod 252 to move upward synchronously. The conical surface on the lifting rod 252 applies a thrust to the pressure surface on the arc plate 251 in a direction away from the cylindrical pressure head 23. The arc plate 251 extends from the chute and applies radial pressure to the raw material from the middle. This, combined with the axial pressure of the annular pressure head 22, forms a three-dimensional pressure field, increases the effective pressing stroke, and improves the oil yield. At the same time, the axial pressure, as the main pressure, forces the oil to flow from the center of the raw material to the surrounding area, while the radial pressure, as the auxiliary pressure, gradually compresses the circumference of the raw material, breaks up the blockage points formed by particle accumulation, and ensures that the oil discharge channel remains unobstructed.

[0061] As the telescopic plate 233 moves upward, it also drives the guide rod 232 to move along the guide groove, causing the telescopic plate 233 to gradually move towards the axis of the cylindrical pressure head 23. When the guide rod 232 moves to the upper end of the guide groove, the end of the telescopic plate 233 away from the axis of the cylindrical pressure head 23 is completely retracted into the mating groove 231, and the annular pressure head 22 can continue to move upward to fully squeeze the raw material.

[0062] Once the pressure reaches its peak, a pressure holding phase begins (lasting 2-5 minutes), allowing the grease sufficient time to slowly flow out from deep within the raw material. It should be noted that before the axial pressure reaches its peak, the annular pressure head 22 can be intermittently and repeatedly squeezed against the telescopic plate 233 by reciprocating the drive end of the hydraulic cylinder, thereby achieving radial pulse compression to maintain the oil passage unblocking effect.

[0063] When only axial extrusion of the raw material is required, the hydraulic cylinder 8 is rotated by the drive motor, which in turn causes the cylindrical press head 23 to rotate circumferentially, so that the telescopic plate 233 corresponds vertically to the clearance groove 221. Then, the hydraulic cylinder 8 drives the cylindrical press head 23 to move downward, so that the telescopic plate 233 passes through the clearance groove 221. When the cylindrical press head 23 moves to the lower limit position, the annular press head 22 and the cylindrical press head 23 are at the same height. During operation, the hydraulic cylinders 7 and 8 are started simultaneously to apply axial pressure to the raw material in the filter bag from the bottom, thereby squeezing out the oil from the raw material.

[0064] After the oil pressing is completed, when the hydraulic cylinder 7 drives the annular pressure head 22 to return to its original position, the telescopic plate 233 is no longer squeezed. Under the elastic force of the support spring, the lifting rod 252 drives the telescopic plate 233 to return to its original position. Through the sliding cooperation between the conical surface and the pressure surface, the arc plate 251 retracts into the trough. At the same time, the guide rod 232 moves to the lower end of the guide groove, and the end of the telescopic plate 233 away from the axis of the cylindrical pressure head 23 extends out of the mating groove 231 to prepare for the next batch of oil pressing.

[0065] In addition, during the oil pressing process, some oil flows out from the bottom of the filter bag and flows along multiple oil guide grooves 241 radially distributed on the annular press head 22 to the extension groove 242, and finally flows out through the oil discharge groove corresponding to the extension groove 242, thereby further increasing the number of oil discharge channels and effectively preventing oil blockage.

[0066] In summary, this invention uses the combination of a ring-shaped pressure head 22 and a cylindrical pressure head 23 with variable relative positions to press raw materials. The appropriate pressing method can be selected according to the actual type of raw material. For example, for raw materials with high fiber content and high residual oil rate (such as olives and coconuts), a three-dimensional pressing method combining axial and radial forces can be used. For raw materials with low fiber content and low residual oil rate (such as sesame and peanuts), a single axial pressing method can be used, thereby optimizing energy consumption costs while ensuring oil yield.

[0067] See Figure 9 and Figure 10 The auxiliary oil discharge mechanism 24 also includes a sliding groove that is opened on the inner side of the annular pressure head 22 and communicates with the clearance groove 221. The sliding groove is inverted L-shaped. A sealing block 243 is horizontally and slidably installed in the horizontal section of the sliding groove. A sliding frame 244 is fixedly installed at the lower end of the sealing block 243. The sliding frame 244 is horizontally and slidably installed in the vertical section of the sliding groove. A connecting rod 245 is hinged to the lower end of the sliding frame 244. The end of the connecting rod 245 away from the sliding frame 244 is hinged to the turntable 246. The turntable 246 is vertically and slidably connected to the telescopic end of the hydraulic cylinder 28. The upper end of the turntable 246 is rotatably connected to the lower end of the annular pressure head 22 through an annular plate 651.

[0068] When only axial compression of the raw material is required, i.e., when the telescopic plate 233 is distributed in a state corresponding to the relief groove 221, the end of the protrusion 235 away from the cylindrical pressure head 23 is in contact with the inner wall of the relief groove 221, effectively preventing grease from seeping into the relief groove 221.

[0069] When the raw material needs to be axially and radially extruded, the position of the cylindrical pressure head 23 is adjusted by the drive motor, so that the telescopic plate 233 and the relief groove 221 are staggered in the circumferential direction. At the same time, the drive motor drives the turntable 246 to rotate synchronously through the hydraulic cylinder 28. Under the transmission action of the connecting rod 245, the sliding frame 244 pushes the sealing block 243 towards the cylindrical pressure head 23, so that the end of the sealing block 243 away from the sliding frame 244 fits against the outer wall of the cylindrical pressure head 23, effectively preventing grease from seeping into the relief groove 221.

[0070] To further reduce grease penetration, a circular baffle is fixedly installed inside the mounting cylinder 21. The circular baffle has corresponding clearance holes for the extension and retraction ends of hydraulic cylinder 7 and hydraulic cylinder 8. The circular baffle prevents grease from adhering to the fixed ends of hydraulic cylinders 7 and 8 and the lower half of the mounting cylinder, thus reducing the frequency of maintenance.

[0071] It should be noted that after prolonged use, a small amount of grease will inevitably adhere to the inner and outer walls of the annular pressure head 22 and the cylindrical pressure head 23. To address this, both the annular pressure head 22 and the cylindrical pressure head 23 can be detached for periodic cleaning and maintenance. Simultaneously, the material cylinder should also be cleaned regularly to ensure that critical components such as the oil guide groove 241 and the clearance groove 221 are free of oil residue blockage, thus maintaining optimal equipment performance.

[0072] The present invention also provides a vegetable oil pressing process, which is completed in conjunction with the above-mentioned vegetable oil pressing equipment, including the following steps: S1, put the raw material into the filter bag, the filling should be moderately loose and loose, so as to reserve space for the flow and deformation of the raw material during the pressing process, then put the filter bag into the material cylinder 4, place the pad 64 into the round hole of the limiting plate 63, rotate the upper top plate 61 to the working position and lock it, and seal the upper end of the material cylinder 4 through the upper top plate 61 and the pad 64.

[0073] S2. Turn on the external air pump to introduce compressed air into the air supply chamber 653. The pressure mechanism 65 presses out an annular groove on the upper end of the filter bag and holds the pressure for 30 seconds to stabilize the shape of the annular groove.

[0074] S3. Start the oil pressing unit 2. Depending on the type of raw material, select to perform single axial extrusion or axial-radial combined extrusion on the raw material. The extruded oil flows out from the oil discharge trough 41 and into the oil receiving tray 3. The oil in the oil receiving tray 3 is further filtered by the filter screen and then introduced into the external oil storage tank.

[0075] S4. Remove the top plate 61 and the pad plate 64, and take the filter bag (containing the pressed oil cake) out of the feed cylinder 4.

[0076] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0077] In the description of this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0078] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" 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 according to the specific circumstances.

[0079] The above provides a detailed description of the vegetable oil pressing equipment and pressing process provided by the present invention. For those skilled in the art, based on the ideas of the embodiments of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A vegetable oil pressing device, characterized in that, Includes a base, an oil pressing unit in the middle of the base, an oil receiving tray above the oil pressing unit, a material cylinder above the oil receiving tray, oil discharge grooves evenly opened on the side wall of the material cylinder, columns installed on both sides of the base, and a sealing unit installed between the two columns. The oil pressing unit includes an installation cylinder, an annular pressure head located inside the installation cylinder, and a cylindrical pressure head that slides and seals with the annular pressure head. The installation cylinder is fixedly installed on the base, and the annular pressure head and the cylindrical pressure head are driven by drive component one and drive component two, respectively. The annular pressure head is equipped with an auxiliary oil discharge mechanism for increasing the oil discharge channel, and the cylindrical pressure head is equipped with a pressure-applying mechanism for applying radial pressure to the raw material. When the annular pressure head is flush with the upper surface of the cylindrical pressure head, only the material is subjected to axial extrusion. When the upper surface of the cylindrical pressure head is higher than the upper surface of the annular pressure head, the cylindrical pressure head is inserted into the middle of the material, which can simultaneously perform axial and radial extrusion on the material. The enclosed unit includes an upper top plate, a limiting nut threaded onto the top of the column, and a limiting plate fixedly installed between two columns. The limiting plate has a circular hole in the middle, and a pad is placed in the circular hole. The pad is provided with a pressing mechanism for pressing out an annular groove above the raw material. The pressurizing mechanism includes multiple circumferentially evenly opened sliding grooves on the side wall of a cylindrical press head, a lifting groove in the middle of the cylindrical press head that communicates with the multiple sliding grooves, an arc plate that is horizontally slidably sealed in the sliding groove, a lifting rod that is vertically slidably installed in the lifting groove, a support spring connecting the lifting rod and the lifting groove, two conical surfaces on the side wall of the lifting rod, and a pressure-bearing surface on the inner wall of the arc plate that corresponds one-to-one with the conical surface, and the pressure-bearing surface and the conical surface are slidably connected. The cylindrical pressure head has multiple mating grooves evenly distributed around its sidewall. Each mating groove corresponds to a sliding groove and is located below the sliding groove. Inclined guide grooves are provided on both sides of the mating grooves along their width direction. Guide rods are slidably installed in the guide grooves. Telescopic plates are fixedly installed between the guide rods on both sides. The telescopic plates are horizontally slidably fitted onto the fixed rods. The fixed rods are fixedly connected to the sidewall of the cylindrical pressure head. The inner side of the upper end of the annular pressure head has a clearance groove corresponding to the telescopic plates. Multiple protrusions corresponding to the telescopic plates are evenly fixedly installed around the upper end of the cylindrical pressure head.

2. The vegetable oil pressing equipment according to claim 1, characterized in that, The pressing mechanism includes two concentric annular grooves on the pad, an annular plate is slidably installed in the annular grooves, and multiple drive grooves communicating with the annular grooves are opened at the upper end of the annular grooves. A piston rod is slidably installed in each drive groove, and the lower end of the piston rod is fixedly connected to the upper end of the annular plate. An annular air supply chamber is provided at the lower end of the top plate. An air vent is provided at the rear side of the air supply chamber and is connected to an external air pump. Lifting rings are slidably installed on both the inner and outer annular sidewalls of the air supply chamber. A sealing ring is fixedly installed at the lower end of the lifting ring. An isolation ring is provided on the side of the lifting ring near the air supply chamber. A helical spring is connected between the isolation ring and the lifting ring. A connecting hole is horizontally opened on the isolation ring. The side of the lifting ring facing the connecting hole is a sloping structure.

3. The vegetable oil pressing equipment according to claim 1, characterized in that, The auxiliary oil discharge mechanism includes several oil guide grooves radially distributed on the upper surface of the annular pressure head. The lower end of the oil guide grooves is gradually inclined downward from the inside to the outside. An extension groove communicating with the lower side of the end of the oil guide groove away from the axis of the annular pressure head is opened. The extension groove penetrates the outer wall of the annular pressure head.

4. The vegetable oil pressing equipment according to claim 1, characterized in that, The driving component includes several hydraulic cylinders fixedly installed inside the mounting cylinder. The telescopic end of each hydraulic cylinder is fixedly connected to the lower end of the annular pressure head. The hydraulic cylinders are symmetrically distributed on both sides of the annular pressure head.

5. A vegetable oil pressing device according to claim 2, characterized in that, The second driving component includes a second hydraulic cylinder that is rotatably installed inside the mounting cylinder. The fixed end of the second hydraulic cylinder is fixedly connected to the output shaft of the drive motor, and the telescopic end of the second hydraulic cylinder is fixedly connected to the lower end of the cylindrical pressure head.

6. The vegetable oil pressing equipment according to claim 5, characterized in that, The auxiliary oil discharge mechanism also includes a sliding groove connected to the avoidance groove on the inner side of the annular pressure head. The sliding groove is inverted L-shaped. A sealing block is horizontally and slidably installed in the horizontal section of the sliding groove. A sliding frame is fixedly installed at the lower end of the sealing block. The sliding frame is horizontally and slidably installed in the vertical section of the sliding groove. A connecting rod is hinged to the lower end of the sliding frame. The end of the connecting rod away from the sliding frame is hinged to the turntable. The turntable is vertically and slidably connected to the two extension ends of the hydraulic cylinder. The upper end of the turntable is rotatably connected to the lower end of the annular pressure head through an annular plate.

7. A vegetable oil pressing process, completed in conjunction with the vegetable oil pressing equipment as described in claim 1, characterized in that, Includes the following steps: S1. Put the raw material into the filter bag, then put the filter bag into the material cylinder, and seal the upper end of the material cylinder by the top plate and the pad plate. S2. An annular groove is pressed out at the upper end of the filter bag by the pressing mechanism to increase the oil discharge channel; S3. Start the oil pressing unit and press the raw materials according to their type. The pressed oil flows out from the oil discharge trough and into the oil receiving tray. S4. Remove the top plate and pad, and take the filter bag out of the material cylinder.

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