A rapeseed oil pressing device

Abstract

This utility model discloses a rapeseed oil pressing device, belonging to the technical field of oil presses. It includes a base, two columns, a main cylinder, an upper top plate, and two dynamic pressure plate assemblies. The two columns are vertically mounted on the base. The main cylinder is axially divided into an upper pressing chamber and a lower hydraulic chamber. The two dynamic pressure plate assemblies are respectively fixed to the bottom end of a top rod and the output end of a hydraulic cylinder. Each dynamic pressure plate assembly includes multiple concentric rings connected by an axial connection structure. During the pressing process, each concentric ring extends axially in sequence, forming a progressive conical structure. This rapeseed oil pressing device, through the dynamic pressure plate assembly gradually forming a dynamic cone angle during pressing, forces the rapeseed to flow from the center outwards, effectively disrupting the stability of the arch bridge structure and ensuring that the central area also receives high pressure. This results in a more uniform pressure transmission from the center to the edge, greatly improving the uniformity of oil extraction.

Description

Technical Field

[0001] This utility model belongs to the field of oil press technology, and in particular relates to a rapeseed oil pressing device. Background Technology

[0002] Currently, most hydraulic oil presses on the market use a flat pressure plate structure to axially squeeze the oilseeds. This traditional structure exposes many technical defects during the pressing process.

[0003] During the pressing process, an "arching effect" easily forms between oilseed particles. Specifically, rapeseed oil is roasted and crushed before pressing to form powder. During pressing, the rapeseed powder has poor flowability. When the pressure plate applies pressure to the oilseed, the oilseed particles are not uniformly stressed, but rather generate complex interaction forces with each other, forming an arch-like structure. This prevents the pressure from being evenly transmitted to each oilseed particle. This directly leads to uneven pressure distribution, especially in the central area of ​​the pressing chamber where the pressure is severely insufficient. This uneven pressure distribution prevents the oilseed in the central area from being fully pressed, leaving a large amount of oil residue in the oilseed, resulting in a high residual oil rate. Existing technology uses hydraulic equipment with a larger load to provide greater pressure and increase the oil yield. However, a larger load hydraulic equipment means higher equipment costs, increasing the production investment for enterprises. Moreover, excessive pressure can seriously damage the pressing chamber, leading to deformation of the pressing chamber with long-term use, affecting the normal operation and service life of the equipment.

[0004] Therefore, we propose a rapeseed oil pressing device to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to solve the problem of low oil yield caused by uneven pressure distribution during rapeseed oil pressing in the prior art, and to propose a rapeseed oil pressing device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A rapeseed oil pressing device includes a base, two columns, a main cylinder, an upper top plate, and two dynamic pressing plate assemblies, wherein the two columns are vertically installed on the base;

[0008] The interior of the main cylinder is divided axially into:

[0009] The upper oil pressing chamber is used to hold the material to be pressed, and the main cylinder has multiple oil outlet grooves axially opened in the part corresponding to the oil pressing chamber;

[0010] The lower hydraulic chamber contains a built-in hydraulic cylinder, the output end of which extends upwards to the oil pressing chamber.

[0011] The upper top plate is rotatably mounted on one of the columns for opening and closing the oil pressing chamber, and a top rod that can extend into the oil pressing chamber is slidably mounted at the center of the upper top plate, with a positioning structure between the top rod and the upper top plate.

[0012] Two dynamic pressure plate assemblies are fixed to the bottom end of the top rod and the output end of the hydraulic cylinder, respectively. The dynamic pressure plate assembly includes multiple concentric rings, which are connected by an axial connection structure. During the extrusion process, each concentric ring extends axially in sequence, so that the dynamic pressure plate assembly forms a progressive conical structure.

[0013] Preferably, the top of both columns is threaded with a limit cap to prevent the top plate from coming off the top of the column.

[0014] Preferably, a notch is provided on one side of the upper top plate, and when the upper top plate rotates around one of the columns to close the oil pressing chamber, the notch can engage with the other column.

[0015] Preferably, the cross-section of the oil outlet groove is trapezoidal, with the shorter side being the side closest to the oil pressing chamber.

[0016] Preferably, an inclined oil drain groove is fixedly installed on the outer wall of the main cylinder, the oil drain groove is located below the oil outlet groove, and an oil outlet is installed on the lower side of the oil drain groove.

[0017] Preferably, the plurality of concentric rings are coaxially sealed and slidably connected, the concentric ring located at the center is a solid disc, and the outer ring of the concentric ring is provided with a chamfer.

[0018] Preferably, the axial connection structure includes a plurality of evenly distributed slide rods fixedly installed on the outer wall of the concentric ring. The slide rods are L-shaped and have a groove on the inner side of the concentric ring. The slide rods can extend into the grooves of adjacent concentric rings, and the vertical part of the slide rod extends out of the concentric ring and slides with it. A baffle is provided at the end of the slide rod, and a spring is sleeved on the slide rod to act between the baffle and the concentric ring.

[0019] Preferably, the outer wall of the concentric ring is provided with a limiting block flush with the non-extrusion surface, and the inner wall of the concentric ring is provided with a limiting groove that matches the limiting block at the adjacent position.

[0020] Preferably, the positioning structure includes a support ring fixedly mounted on the upper top plate, the support ring having a through hole extending laterally, and the top rod having two through holes located at different axial positions, with a rod inserted into each through hole, the rod being able to cooperate with different through holes to control the axial position of the top rod.

[0021] In summary, the technical effects and advantages of this utility model are as follows:

[0022] Traditional flat-pressing discs, when pressing rapeseed, suffer from insufficient force in the central area due to the arching effect, resulting in incomplete pressing of the rapeseed in the center and severely impacting oil yield. In contrast, the dynamic pressing disc assembly of this invention features concentric rings aligned initially, contacting the rapeseed evenly like a conventional flat-pressing disc. During pressing, the central concentric ring extends first, gradually forming a dynamic cone angle, forcing the rapeseed to flow outward from the center. This effectively disrupts the stability of the arching structure, ensuring high pressure in the central area and resulting in more uniform pressure distribution from the center to the edge. This completely eliminates the low-pressure zone in the center of traditional flat-pressing discs, significantly improving the uniformity of oil extraction. Furthermore, the progressive conical structure allows the rapeseed to slide outward along the conical surface during pressing, creating radial flow and facilitating oil seepage from the edges. Compared to the pure axial pressing of a flat-pressing disc, the radial force of the progressive conical structure helps the oil to be discharged more quickly. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the stress distribution in an existing flatbed pressing device.

[0025] Figure 3 This is a top view of the structure of this utility model;

[0026] Figure 4 This is a schematic diagram of the cross-sectional structure of the oil outlet groove in this utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the top rod of this utility model in the first fixed position;

[0028] Figure 6 This is a schematic diagram of the structure of the top rod of this utility model located in the second fixed position;

[0029] Figure 7 This is a schematic diagram of the concentric rings of the dynamic pressure plate assembly of this utility model in a flush state.

[0030] Figure 8 This is a schematic diagram of the dynamic cone angle structure formed by the dynamic pressure plate assembly of this utility model;

[0031] Figure 9 This is an exploded view of the dynamic pressure plate assembly of this utility model;

[0032] Figure 10 This is a schematic diagram of the axial connection structure of this utility model.

[0033] In the diagram: 1. Base; 2. Column; 3. Limiting cap; 4. Main cylinder; 41. Oil pressing chamber; 411. Oil outlet groove; 42. Hydraulic chamber; 43. Oil drain groove; 44. Oil outlet; 5. Hydraulic cylinder; 6. Top plate; 61. Notch; 62. Top rod; 621. Through hole; 63. Support ring; 64. Insert rod; 7. Dynamic pressing plate assembly; 71. Concentric ring; 711. Chamfer; 712. Limiting block; 713. Limiting groove; 72. Axial connection structure; 721. Slide rod; 722. Slide groove; 723. Spring. Detailed Implementation

[0034] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0035] Reference Figure 1-10 A rapeseed oil pressing device includes a base 1, two columns 2, a main cylinder 4, an upper top plate 6, and two dynamic pressing plate assemblies 7. The two columns 2 are vertically installed on the base 1. The main cylinder 4 is located between the two columns 2 and is vertically installed. A connecting plate is provided on the top of the main cylinder 4 and is sleeved on the two columns 2 to improve the stability of the main cylinder 4.

[0036] The outer diameters of the two dynamic pressing plate components 7 are adapted to the main cylinder 4. After the rapeseed material is filled into the main cylinder 4, the rapeseed material is pressed to extract oil by the upward movement of the dynamic pressing plate components 7 below.

[0037] The dynamic pressure plate assembly 7 includes multiple concentric rings 71. The concentric ring 71 located at the center is a solid disc. The concentric rings 71 are connected by an axial connection structure 72. During the extrusion process, the concentric rings 71 extend axially in sequence, so that the dynamic pressure plate assembly 7 forms a progressive conical structure.

[0038] Before pressing, rapeseed oil is roasted and crushed to form powder. During the pressing process, the rapeseed powder has poor fluidity. When a traditional flat pressing disc applies pressure to the oilseed, the oil particles are not uniformly stressed, but rather generate complex interaction forces with each other, forming a structure similar to an arch bridge (as shown in the figure, the densely shaded area represents the stress concentration area of ​​the pressed material, and the sparsely shaded area represents the central stress area). Due to the arch bridge effect, the central area is significantly understressed, resulting in the rapeseed in the central part not being fully pressed, which seriously affects the oil yield. The dynamic pressing disc component 7 can form a progressive conical structure during the pressing process, forcing the rapeseed to flow from the center outward, effectively destroying the stability of the arch bridge structure, ensuring that the central area can also be subjected to high pressure, making the pressure transmission from the center to the edge more uniform, greatly improving the uniformity of oil output. Furthermore, after forming a progressive conical structure, during the extrusion process, the rapeseed will slide outward along the conical surface, forming radial flow, making it easier for oil to seep out from the edge.

[0039] The main cylinder 4 is divided into an oil pressing chamber 41 and a hydraulic chamber 42 along the axial direction. The dynamic pressure plate assembly 7 located below is in a sealed sliding connection with the inner wall of the oil pressing chamber 41. When the rapeseed material is filled into the oil pressing chamber 41, it is supported on the dynamic pressure plate assembly 7.

[0040] The oil pressing chamber 41 is located at the top and is used to hold the material to be pressed. The main cylinder 4 has multiple oil outlet grooves 411 axially opened in the part corresponding to the oil pressing chamber 41. After the rapeseed material is squeezed out of the oil, the rapeseed oil flows out of the main cylinder 4 through the oil outlet grooves 411.

[0041] The hydraulic chamber 42 is located at the bottom and contains a hydraulic cylinder 5. The output end of the hydraulic cylinder 5 extends upward to the oil pressing chamber 41. The output end of the hydraulic cylinder 5 is set vertically upward. The hydraulic cylinder 5 is existing technology, and the pipelines, controllers, etc. involved in its operation are partially shown in the attached drawings.

[0042] During oil pressing, the power is provided by the hydraulic cylinder 5 located below. Sufficient resistance needs to be provided above the oil pressing chamber 41. After the oil pressing chamber 41 is filled with pressing material, the dynamic pressure plate assembly 7 located above extends into the oil pressing chamber 41, and then the upper opening of the oil pressing chamber 41 is closed by the upper top plate 6. When the hydraulic cylinder 5 is started, the dynamic pressure plate assembly 7 located above, supported by the upper top plate 6, cooperates with the dynamic pressure plate assembly 7 below to extract the oil from the rapeseed pressing material.

[0043] The upper top plate 6 is rotatably mounted on one of the columns 2 and is used to open and close the oil pressing chamber 41. Due to the slag discharge requirements of the packing box, the upper opening of the oil pressing chamber 41 can be opened and closed by deflecting the upper top plate 6. A notch 61 is provided on one side of the upper top plate 6. When the upper top plate 6 rotates around one of the columns 2 to close the oil pressing chamber 41, the notch 61 can engage with the other column 2. The tops of both columns 2 are threaded with limit caps 3. The limit caps 3 are located above the upper top plate 6. During hydraulic oil pressing, the upper top plate 6 is pushed upward by the hydraulic cylinder 5. The limit caps 3 limit the upper top plate 6, preventing it from coming off the top of the column 2. Since the limit caps 3 are threaded to the column 2, the limit height can be adjusted by rotating the limit caps 3. It should be noted that the two limit caps 3 need to be kept on the same plane to avoid uneven force on the upper top plate 6 during the pressing process, which could damage the equipment.

[0044] Reference Figure 5-6A push rod 62, which can extend into the oil pressing chamber 41, is slidably installed at the center of the upper top plate 6. Two dynamic pressing plate assemblies 7 are respectively fixed to the bottom end of the push rod 62 and the output end of the hydraulic cylinder 5. The connection point of the dynamic pressing plate assembly 7 is a solid disc at the center. A positioning structure is provided between the push rod 62 and the upper top plate 6. Since the dynamic pressing plate assembly 7 can form a progressive conical structure during the pressing process, it will produce an axial height change. This height difference will affect the opening and closing of the upper top plate 6. A cavity is provided on the bottom surface of the upper top plate 6 for the dynamic pressing plate assembly 7 to enter. The dynamic pressing plate assembly 7 is fixed to the bottom end of the push rod 62 and is connected by the push rod. 62 moves to control the position of the dynamic pressing plate assembly 7. The top rod 62 slides on the upper top plate 6 and is fixed in position by the positioning structure. The positioning structure provides two fixed positions for the fixed top rod 62, which correspond to different working states of the pressing device. The first fixed position is when the dynamic pressing plate assembly 7 is located in the cavity, at which time the upper top plate 6 can be rotated and opened normally. The second fixed position is when the dynamic pressing plate assembly 7 extends into the oil pressing chamber 41, and when the dynamic pressing plate assembly 7 forms a progressive conical structure, the highest position does not exceed the upper edge of the oil pressing chamber 41, ensuring that the rapeseed material will not leak out under the squeezing action during the pressing process.

[0045] The positioning structure includes a support ring 63 fixedly mounted on the upper top plate 6. The support ring 63 has a through hole extending laterally. The top rod 62 has two through holes 621 located at different axial positions. Insert rods 64 are inserted into the through holes. The insert rods 64 can cooperate with different through holes 621 to control the axial position of the top rod 62. When it is necessary to adjust the position of the top rod 62, the insert rods 64 are pulled out. At this time, the top rod 62 can slide freely up and down. After the top rod 62 reaches the specified fixed position, the insert rods 64 are inserted to fix the position of the top rod 62.

[0046] Reference Figure 1 and 3 An inclined oil draining trough 43 is fixedly installed on the outer wall of the main cylinder 4. The oil draining trough 43 is located below the oil outlet 411. An oil outlet 44 is installed on the lower side of the oil draining trough 43. The pressed rapeseed oil flows into the oil draining trough 43. Since the oil draining trough 43 is inclined, the rapeseed oil flows towards the oil outlet 44 and is collected by a collection container below the oil outlet 44.

[0047] Reference Figure 4 The oil outlet groove 411 has a trapezoidal cross-section, with the side closest to the oil pressing chamber 41 being the short side. During hydraulic oil pressing, the oil pressing chamber 41 will be subjected to enormous pressure. The trapezoidal cross-section of the oil outlet groove 411 can reduce the risk of deformation. At the same time, the short side of the trapezoid is located on the inside, forming a narrower oil outlet gap, which can reduce the risk of overflow during the oil pressing process.

[0048] Reference Figure 5-10The axial connection structure 72 includes multiple evenly distributed slide rods 721 fixedly installed on the outer wall of the concentric ring 71. The slide rods 721 are L-shaped and bent towards the original extrusion surface. A groove 722 is formed on the inner side of the concentric ring 71. The width of the groove 722 is adapted to the slide rod 721, and the height is greater than the diameter of the slide rod 721. The slide rod 721 can extend into the groove 722 of the adjacent concentric ring 71. The vertical part of the slide rod 721 extends out of the concentric ring 71 and slides with it. Therefore, two adjacent concentric rings 71 can slide together within the groove 722. Within the range of axial sliding, during the pressing process of the dynamic pressure plate assembly 7, the concentric ring 71 is squeezed by force. Since the connection point of the dynamic pressure plate assembly 7 is a solid disc, the outer concentric ring 71 gradually moves outward under the pressure of the pressed material, forming a conical structure. A baffle is provided at the end of the slide rod 721, and a spring 723 is sleeved on the slide rod 721 and acts between the baffle and the concentric ring 71. Through the elastic force of the spring 723, the concentric ring 71 is kept in a flat state under the action of no external force. Therefore, when filling, it can leave enough filling space as in the traditional flat pressure plate.

[0049] Reference Figure 5-10 Multiple concentric rings 71 are coaxially sealed and slidably connected. A chamfer 711 is provided on the outer ring of the concentric rings 71. When the multiple concentric rings 71 extend axially in sequence, so that the dynamic pressure plate assembly 7 forms a progressive conical structure, the chamfers 711 of each concentric ring 71 match each other to form a conical surface. This can guide the pressed material during the pressing process, so that the rapeseed pressed material slides outward along the conical surface to form a radial flow, making it easier for oil to seep out from the edge.

[0050] To ensure the axial compressive strength between the concentric rings 71, a limiting block 712 flush with the non-extrusion surface is provided on the outer wall of the concentric ring 71, and a limiting groove 713 adapted to the limiting block 712 at the adjacent position is provided on the inner wall of the concentric ring 71. During pressing, the dynamic pressure plate assembly 7 forms a progressive conical structure, and the limiting block 712 abuts against the limiting groove 713 at the adjacent position, thereby improving the axial connection strength between adjacent concentric rings 71 and avoiding deformation, breakage and other situations during high-pressure pressing.

[0051] The working principle of this utility model is as follows:

[0052] Under the elastic force of spring 723, the concentric rings 71 of the dynamic pressing plate assembly 7 are on the same horizontal plane. First, adjust the top rod 62 to the first fixed position and then insert the insertion rod 64 to fix it. At this time, the dynamic pressing plate assembly 7 is located in the cavity. Rotate the upper top plate 6 to expose the top opening of the oil pressing chamber 41. Inject rapeseed powder into the oil pressing chamber 41. Rotate the upper top plate 6 to close the oil pressing chamber 41. Then adjust the top rod 62 to the first fixed position and fix it. Rotate the limit cap 3 to adjust the limit height. After keeping the two limit caps 3 on the same plane, start the hydraulic cylinder 5. The hydraulic cylinder 5 generates an upward thrust, causing the two dynamic pressing plate assemblies 7 to move together. The materials are brought closer together to be squeezed to extract oil. The concentric rings 71 are squeezed under pressure. Since the connection point of the dynamic pressure plate assembly 7 is a solid disc, the outer concentric rings 71 gradually move outward under the pressure of the materials, forming a conical structure. This forces the rapeseed to flow from the center outward, effectively disrupting the stability of the arch bridge structure and ensuring that the central area is also subjected to high pressure. This makes the pressure transmission from the center to the edge more uniform, greatly improving the uniformity of oil extraction. The pressed rapeseed oil flows into the oil discharge trough 43. Since the oil discharge trough 43 is inclined, the rapeseed oil flows towards the oil outlet 44 and is collected by the collection container below the oil outlet 44.

[0053] After the oil pressing is completed, the hydraulic cylinder 5 is depressurized, and the top plate 6 is opened in the same way to expose the top opening of the oil pressing chamber 41. With the oil pressing chamber 41 in the open state, the hydraulic cylinder 5 is activated to push the rapeseed cake out of the oil pressing chamber 41.

Claims

1. A rapeseed oil pressing device, comprising a base (1), two columns (2), a main cylinder (4), an upper top plate (6), and two dynamic pressing plate assemblies (7), wherein the two columns (2) are vertically mounted on the base (1), characterized in that, The main cylinder (4) is divided into an upper oil pressing chamber (41) and a lower hydraulic chamber (42) along the axial direction. The oil pressing chamber (41) is used to hold the material to be pressed. The main cylinder (4) is provided with multiple oil outlet grooves (411) in the axial direction corresponding to the oil pressing chamber (41). The lower hydraulic chamber (42) has a built-in hydraulic cylinder (5). The output end of the hydraulic cylinder (5) extends upward to the oil pressing chamber (41). The upper top plate (6) is rotatably mounted on one of the columns (2) for opening and closing the oil pressing chamber (41), and a top rod (62) that can extend into the oil pressing chamber (41) is slidably mounted in the center of the upper top plate (6), and a positioning structure is provided between the top rod (62) and the upper top plate (6); The two dynamic pressure plate assemblies (7) are respectively fixed at the bottom end of the top rod (62) and the output end of the hydraulic cylinder (5). The dynamic pressure plate assembly (7) includes multiple concentric rings (71), and each concentric ring (71) is connected by an axial connection structure (72). During the extrusion process, each concentric ring (71) extends axially in sequence, so that the dynamic pressure plate assembly (7) forms a progressive conical structure.

2. The rapeseed oil pressing apparatus according to claim 1, characterized in that, The axial connection structure (72) includes a plurality of evenly distributed slide rods (721) fixedly installed on the outer wall of the concentric ring (71). The slide rods (721) are L-shaped and have a groove (722) on the inner side of the concentric ring (71). The slide rods (721) can extend into the groove (722) of the adjacent concentric ring (71), and the vertical part of the slide rods (721) extends out of the concentric ring (71) and slides with it. A baffle is provided at the end of the slide rod (721), and a spring (723) is sleeved on the slide rod (721) and acts between the baffle and the concentric ring (71).

3. A rapeseed oil pressing apparatus according to claim 1 or 2, characterized in that, The outer wall of the concentric ring (71) is provided with a limiting block (712) that is flush with the non-extrusion surface, and the inner wall of the concentric ring (71) is provided with a limiting groove (713) that is adapted to the limiting block (712) at the adjacent position.

4. The rapeseed oil pressing apparatus according to claim 3, characterized in that, Multiple concentric rings (71) are coaxially sealed and slidably connected. The concentric ring (71) located at the center is a solid disc, and a chamfer (711) is provided on the outer ring of the concentric ring (71).

5. The rapeseed oil pressing apparatus according to claim 1, characterized in that, The positioning structure includes a support ring (63) fixedly mounted on the upper top plate (6). The support ring (63) has a through hole running through it laterally. The top rod (62) has two through holes (621) located at different axial positions. A rod (64) is inserted into the through hole. The rod (64) can cooperate with the different through holes (621) to control the axial position of the top rod (62).

6. The rapeseed oil pressing apparatus according to claim 1, characterized in that, Both columns (2) are threaded with limit caps (3) at their tops to prevent the top plate (6) from coming off the top of the column (2).

7. The rapeseed oil pressing apparatus according to claim 1, characterized in that, The upper top plate (6) has a notch (61) on one side. When the upper top plate (6) rotates around one of the columns (2) to close the oil pressing chamber (41), the notch (61) can engage with the other column (2).

8. The rapeseed oil pressing apparatus according to claim 1, characterized in that, The cross-section of the oil outlet groove (411) is trapezoidal, with the side closest to the oil pressing chamber (41) being the shorter side.

9. A rapeseed oil pressing apparatus according to claim 4, characterized in that, An inclined oil drain groove (43) is fixedly installed on the outer wall of the main cylinder (4). The oil drain groove (43) is located below the oil outlet groove (411), and an oil outlet (44) is installed on the lower side of the oil drain groove (43).

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