A device and method for the expression of oil from woody oilseeds

Abstract

This invention discloses an oil pressing device and method for woody oilseeds, aiming to solve the problems of low oil yield and large amount of residual oil in the oil residue after cold pressing, resulting in waste. The invention includes a machine body and a rotating shaft installed within the machine body. The machine body includes a cold pressing section, a steaming and roasting section, and a hot pressing section arranged sequentially along the length of the rotating shaft. Spiral pressing blades are installed at corresponding positions in the cold pressing and hot pressing sections on the rotating shaft. A feeding hopper is installed at the front end of the cold pressing section on the machine body. The steaming and roasting section is equipped with a heating element and a steam delivery pipe. The heating element heats the steaming and roasting section, and the steam delivery pipe supplies steam to the steaming and roasting section. The woody oilseeds are first cold-pressed to obtain high-quality cold-pressed oil. The cold-pressed oil residue is then further hot-pressed to extract the residual oil, reducing the oil content in the oil residue and increasing the oil yield.

Description

Technical Field

[0001] This invention relates to an oil pressing apparatus, and more specifically, to an apparatus and method for pressing woody oilseeds. Background Technology

[0002] Woody oilseeds are a general term for the fruits or seeds of woody plants that can be pressed for oil. Oils extracted from woody oilseeds are divided into two main categories: edible and industrial. Edible oils have a pleasant aroma, are non-toxic, and rich in nutrients. Their unsaturated fatty acid content is generally higher than that of herbaceous oils, making them easily absorbed by the human body. Examples include tea seed oil, walnut oil, and torreya nut oil. Woody oilseeds can be pressed using cold pressing and hot pressing methods. Cold-pressed oil is of higher quality because it retains the maximum amount of nutrients. Hot pressing can largely remove the original odor of the oilseeds and fully bring out the aroma of the oil. To obtain high-quality oil, cold pressing is often chosen. However, cold pressing has a low oil yield, and a large amount of oil remains in the residue after cold pressing, resulting in waste. Summary of the Invention

[0003] To overcome the above shortcomings, the present invention provides an apparatus and method for pressing woody oilseeds. The woody oilseeds are pressed to obtain high-quality oil, while reducing the oil content in the oil cake, increasing the oil yield, and avoiding waste.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a woody oilseed pressing device, comprising a machine body and a rotating shaft installed in the machine body. The machine body includes a cold pressing section, a steaming and frying section, and a hot pressing section arranged sequentially along the length of the rotating shaft. Spiral pressing blades are installed at corresponding positions on the cold pressing section and the hot pressing section on the rotating shaft. A feeding hopper is installed at the front end of the cold pressing section on the machine body. The steaming and frying section is equipped with a heating element and a steam conveying pipe. The heating element heats the steaming and frying section, and the steam conveying pipe supplies steam to the steaming and frying section.

[0005] In the oil pressing process for woody oilseeds, the unprocessed woody oilseeds are directly fed into the hopper. As the shaft rotates, the spiral press blades in the cold pressing section simultaneously convey the oilseeds forward and press them, extracting cold-pressed oil which is then collected. The oil residue discharged from the cold pressing section falls into the steaming and roasting section, where a heating element heats the section, and steam is introduced through a steam pipe to steam and roast the oil residue. The steamed and roasted oil residue then enters the hot pressing section, where the spiral press blades simultaneously convey the oil residue forward and press it, extracting hot-pressed oil which is then collected.

[0006] Woody oilseeds are first cold-pressed to obtain high-quality cold-pressed oil. The oil cake after cold pressing is then further hot-pressed to extract the residual oil in the oil cake, thereby reducing the oil content in the oil cake and increasing the oil yield.

[0007] While pressing woody oilseeds to obtain high-quality oil, the oil content in the oil cake is reduced, the oil yield is increased, and waste is avoided.

[0008] Preferably, several arc-shaped material-scooping plates are installed at the corresponding positions of the steaming and frying section on the rotating shaft. One end of the material-scooping plate near the cold pressing section is connected to a baffle, and the other end of the material-scooping plate away from the rotation direction is connected to a guide plate. The guide plate is inclined away from the axis of the rotating shaft from the end connected to the baffle to the other end.

[0009] During the rotation of the shaft, the scooping plate rotates with the shaft to scoop up the oil residue in the steaming and frying section. After rotating to a certain height, the oil residue is subjected to gravity and slides away from the scooping plate along the guide plate towards the hot pressing section. The scooping plate is designed to prevent the oil residue from overheating during steaming and frying, ensuring that the oil residue is heated evenly during the steaming and frying process, and it can also transport the oil residue to the hot pressing section.

[0010] As a preferred option, the material scooping plate, baffle, and guide plate are all densely covered with numerous fine ventilation holes.

[0011] The design of the ventilation holes helps to ensure even heating during the steaming and frying process of the oil cake.

[0012] As a preferred option, several material feeding rods are installed at corresponding positions on the steaming and frying section of the rotating shaft.

[0013] The oil cake falling from the cold pressing section into the steaming and frying section is mostly in lumps. As the feeding rod rotates with the shaft, it can break up the lumps of oil cake and stir the oil cake, so that the oil cake is heated evenly during the steaming and frying process, ensuring the steaming and frying effect.

[0014] Preferably, the steaming and frying section inside the rotating shaft is provided with ventilation holes at corresponding positions, the steaming and frying section is installed with a positioning seat, the positioning seat is provided with mounting holes adapted to the rotating shaft, the inner wall of the mounting holes is provided with ventilation ring grooves, the rotating shaft is fitted with the mounting holes, the rotating shaft is provided with several transition holes connecting the ventilation ring grooves and ventilation holes, the steam conveying pipe is connected to the ventilation ring grooves, and the end of the feeding rod is provided with an air outlet, which is connected to the ventilation holes.

[0015] Steam is delivered to the ventilation ring groove through the steam conveying pipe. After passing through the transition hole, ventilation hole, and air outlet, steam enters the steaming and frying section to steam and fry the oil cake.

[0016] Preferably, the feeding rod includes a fixed section, a movable section, and an elastic column. The fixed section is fastened to the rotating shaft, and one end of the movable section is rotatably connected to the end of the fixed section. An air outlet is provided on the movable section. The fixed section has a tubular structure and a valve plate with a valve hole is provided inside. The upper end of the elastic column is connected to the movable section, and the lower end of the elastic column is sealed and fitted to the valve plate and covers the valve hole. A gap is provided between the outer wall of the elastic column and the inner wall of the fixed section. A flow hole is provided inside the elastic column, and the upper end of the flow hole communicates with the air outlet. An air inlet communicating with the flow hole is provided on the lower outer wall of the elastic column.

[0017] When the feeding rod touches the oil cake, the moving section deflects under force, and the contact end between the elastic column and the valve plate shifts, exposing the valve hole. At this time, steam is discharged into the steaming and frying section through the valve hole, air inlet, flow outlet, and air outlet, directly spraying towards the oil cake. This not only allows for rapid and precise heating and steaming of the oil cake, but the impact of the airflow also agitates the oil cake, promoting uniform heating. When the feeding rod is not touched by the oil cake, the moving section remains stationary under the action of the elastic column. The lower end of the elastic column seals against the valve plate and covers the valve hole. In this case, steam will not escape from the air outlet, avoiding steam waste or overheating of the oil cake.

[0018] Preferably, the movable section is provided with a universal ball head at its end, and the fixed section is provided with a rotating groove that is adapted to the universal ball head at its end, with the universal ball head and the rotating groove being rotatably connected.

[0019] The omnidirectional ball joint is designed to facilitate the deflection of the moving section.

[0020] Preferably, the elastic column is provided with an elastic positioning block, which is adapted to be installed in the fixed section, and the outer wall of the elastic positioning block is provided with several anti-jamming grooves.

[0021] The elastic positioning block ensures reliable positioning of the movable section by the elastic column. When the movable section deflects, the elastic column and elastic positioning block undergo elastic deformation. At this time, the square groove provides space for the elastic positioning block to deform, preventing jamming and affecting the deflection of the movable section. The separation of the movable section from the oil reservoir causes the elastic positioning block and elastic column to return to their original positions, achieving reliable positioning of the movable section.

[0022] Preferably, the steaming and frying section is connected to an exhaust pipe. The exhaust pipe facilitates the removal of moisture from the steaming and frying section.

[0023] A method for pressing oil from woody oilseeds, using a woody oilseed pressing device, includes the following steps:

[0024] S1, put the unsteamed woody oilseeds directly into the feed hopper, the shaft rotates, and the spiral pressing blades of the cold pressing section convey the woody oilseeds forward while pressing them in the spiral pressing to extract cold-pressed oil for collection.

[0025] S2, the dried oil discharged from the cold pressing section falls into the steaming and frying section, the heating element heats the steaming and frying section, and the steam conveying pipe sends steam into the steaming and frying section to steam and fry the dried oil in the steaming and frying section.

[0026] S3, the steamed and fried oil cake enters the hot pressing section. The spiral pressing blades of the hot pressing section convey the oil cake forward while pressing it to extract the hot pressed oil for collection.

[0027] Woody oilseeds are first cold-pressed to obtain high-quality cold-pressed oil. The oil cake after cold pressing is then further hot-pressed to extract the residual oil in the oil cake, thereby reducing the oil content in the oil cake and increasing the oil yield.

[0028] Compared with the prior art, the beneficial effects of the present invention are: while obtaining high-quality oil from woody oilseeds through pressing, the oil content in the oil cake is reduced, the oil yield is increased, and waste is avoided. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 This is a partial structural diagram of the steaming and frying section of the present invention;

[0031] Figure 3 This is a schematic diagram of the connection structure between the material scooping plate and the rotating shaft of the present invention;

[0032] Figure 4 This is a schematic diagram of the material scooping plate of the present invention;

[0033] Figure 5 This is a cross-sectional view of the connection between the feeding rod and the rotating shaft in Embodiment 2 of the present invention;

[0034] In the diagram: 1. Machine body, 2. Rotating shaft, 3. Cold pressing section, 4. Steaming and roasting section, 5. Hot pressing section, 6. Spiral press blades, 7. Feed hopper, 8. Heating element, 9. Steam conveying pipe, 10. Exhaust pipe, 11. Cold pressing chamber, 12. Steaming and roasting chamber, 13. Hot pressing chamber, 14. Cold pressed oil outlet hole, 15. Cold pressed oil collection tray, 16. Hot pressed oil collection tray, 17. Material scooping plate, 18. Baffle, 19. Guide plate, 20. Material pushing rod, 21. Vent hole, 22. Positioning seat, 23. Vent ring groove, 24. Transition hole, 25. Air outlet, 26. Connecting hole, 27. Fixed section, 28. Moving section, 29. Elastic column, 30. Valve plate, 31. Valve hole, 32. Flow hole, 33. Air inlet, 34. Universal ball joint, 35. Elastic positioning block, 36. Anti-jamming groove. Detailed Implementation

[0035] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0036] Example 1: An oil pressing device for woody oilseeds (see attached) Figure 1 To be continued Figure 4The machine includes a body 1 and a rotating shaft 2 installed inside the body. The body is horizontally arranged and includes a cold pressing section 3, a steaming and roasting section 4, and a hot pressing section 5 arranged sequentially along the length of the rotating shaft. The body is mounted on a frame. One end of the rotating shaft is connected to a drive wheel, which is driven by a motor. Spiral pressing blades 6 are installed at corresponding positions on the cold pressing and hot pressing sections. The pitch of the spiral pressing blades in the cold pressing section gradually decreases towards the steaming and roasting section, while the pitch of the spiral pressing blades in the hot pressing section gradually decreases away from the steaming and roasting section. A feed hopper 7 is installed at the front end of the cold pressing section; a heating element 8 and a steam delivery pipe 9 are installed in the steaming and roasting section. The heating element heats the steaming and roasting section, and the steam delivery pipe supplies steam to the steaming and roasting section. An exhaust pipe 10 is connected to the steaming and roasting section.

[0037] The machine body has a cold pressing section with a cold pressing chamber 11, a steaming and frying section with a steaming and frying chamber 12, and a hot pressing section with a hot pressing chamber 13. The machine body has several fine holes 14 and 16 for cold-pressed oil discharge, communicating with the cold pressing chamber and the hot pressing chamber respectively. A cold-pressed oil collection tray 15 and a hot-pressed oil collection tray 16 are installed below the cold pressing section. The inner diameter of the hot pressing chamber is larger than that of the cold pressing chamber. The heating element is electrically heated, and several heating elements are circumferentially spaced on the inner wall of the steaming and frying chamber.

[0038] Several arc-shaped scooping plates 17 are installed at corresponding positions on the steaming and frying section of the rotating shaft. One end of the scooping plate near the cold pressing section is connected to a baffle 18, and the other end away from the rotation direction is connected to a guide plate 19. The guide plate is inclined away from the axis of the rotating shaft from its connection end with the baffle. The guide plate and the rotating shaft are connected by a connecting rod. The scooping plates are evenly distributed circumferentially and spaced axially, with partial overlap between adjacent axially arranged plates. In this embodiment, three scooping plates are provided. The axis of the arc-shaped scooping plates coincides with the axis of the rotating shaft. The multiple scooping plates are spaced axially, with partial overlap between adjacent axially arranged plates, so that the oil residue in the steaming and frying chamber is scooped up by the scooping plates and sequentially transported towards the hot pressing chamber. The oil residue, after being agitated and transported by the scooping plates, achieves good steaming and frying results. The steamed and fried oil residue is then transported to the hot pressing chamber for hot pressing.

[0039] The material scooping plate, baffle, and guide plate are all densely covered with numerous fine ventilation holes (not shown in the figure). Several material-pulling rods 20 are installed at corresponding positions on the steaming / frying section of the rotating shaft. Ventilation holes 21 are provided at corresponding positions on the steaming / frying section inside the rotating shaft. A positioning seat 22 is installed on the steaming / frying section, and the positioning seat has mounting holes adapted to the rotating shaft. A ventilation ring groove 23 is provided on the inner wall of the mounting hole. The rotating shaft is fitted to the mounting hole. Several transition holes 24 are provided on the rotating shaft, connecting the ventilation ring groove and the ventilation hole. The steam delivery pipe is connected to the ventilation ring groove. An exhaust hole 25 is provided at the end of the material-pulling rod, and the exhaust hole is connected to the ventilation hole. A connecting hole 26 is provided on the positioning seat, and the steam delivery pipe is connected to the connecting hole.

[0040] A method for pressing oil from woody oilseeds, using a woody oilseed pressing device, includes the following steps:

[0041] S1, put the unsteamed woody oilseeds directly into the feed hopper, the shaft rotates, and the spiral pressing blades of the cold pressing section convey the woody oilseeds forward while pressing them in the spiral pressing to extract cold-pressed oil for collection.

[0042] S2, the dried oil discharged from the cold pressing section falls into the steaming and frying section, the heating element heats the steaming and frying section, and the steam conveying pipe sends steam into the steaming and frying section to steam and fry the dried oil in the steaming and frying section.

[0043] S3, the steamed and fried oil cake enters the hot pressing section. The spiral pressing blades of the hot pressing section convey the oil cake forward while pressing it to extract the hot pressed oil for collection.

[0044] Example 1: An oil pressing device for woody oilseeds (see attached) Figure 5 The structure is similar to that of Embodiment 1, with the main difference being that the feeding rod in this embodiment includes a fixed section 27, a movable section 28, and an elastic column 29. The fixed section is tightly connected to the rotating shaft, and one end of the movable section is rotatably connected to the end of the fixed section. An air outlet is located on the movable section. The fixed section has a tubular structure and a valve plate 30 is provided inside it. A valve hole 31 is provided on the valve plate. The upper end of the elastic column is connected to the movable section, and the lower end of the elastic column is sealed and fitted to the valve plate, covering the valve hole. A gap is provided between the outer wall of the elastic column and the inner wall of the fixed section. A flow hole 32 is provided inside the elastic column, and the upper end of the flow hole communicates with the air outlet. An air inlet 33 communicating with the flow hole is provided on the lower outer wall of the elastic column. A universal ball joint 34 is provided at the end of the movable section, and a rotating groove adapted to the universal ball joint is provided at the end of the fixed section. The universal ball joint and the rotating groove are rotatably connected. An elastic positioning block 35 is provided on the elastic column and is adapted to be installed inside the fixed section. Several anti-jamming grooves 36 are provided on the outer wall of the elastic positioning block. A connecting sleeve is provided on the rotating shaft corresponding to the feeding rod. The connecting sleeve is connected to the vent hole, and the fixed section is fastened to the connecting sleeve. Other structures are the same as in Embodiment 1.

[0045] When the feeding rod touches the oil cake, the moving section deflects under force, and the contact end between the elastic column and the valve plate shifts, exposing the valve hole. At this time, steam is discharged into the steaming and frying section through the valve hole, air inlet, flow outlet, and air outlet, directly spraying towards the oil cake. This not only allows for rapid and precise heating and steaming of the oil cake, but the impact of the airflow also agitates the oil cake, promoting uniform heating. When the feeding rod is not touched by the oil cake, the moving section remains stationary under the action of the elastic column. The lower end of the elastic column seals against the valve plate and covers the valve hole. In this case, steam will not escape from the air outlet, avoiding steam waste or overheating of the oil cake.

[0046] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications may be made without departing from the technical solutions described in the claims.

Claims

1. An oil pressing device for woody oilseeds, characterized in that, The machine includes a body and a rotating shaft installed within it. The body comprises a cold-pressing section, a steaming and roasting section, and a hot-pressing section arranged sequentially along the length of the rotating shaft. Spiral pressing blades are installed at corresponding positions in the cold-pressing and hot-pressing sections on the rotating shaft. A feed hopper is installed at the front end of the cold-pressing section. The steaming and roasting section is equipped with a heating element and a steam delivery pipe. The heating element heats the steaming and roasting section, and the steam delivery pipe supplies steam to it. Several feeding rods are installed at corresponding positions in the steaming and roasting section on the rotating shaft. Ventilation holes are provided at corresponding positions in the steaming and roasting section within the rotating shaft. A positioning seat is installed in the steaming and roasting section, and the positioning seat has mounting holes adapted to the rotating shaft. Ventilation annular grooves are provided on the inner walls of the mounting holes. The rotating shaft is fitted to the mounting holes. Several transition holes are provided on the rotating shaft connecting the ventilation annular grooves and the ventilation holes. The steam delivery pipe is connected to the ventilation annular grooves. Air outlets are provided at the ends of the feeding rods, and these outlets are connected to the ventilation... The feed rod consists of a fixed section, a movable section, and an elastic column. The fixed section is fastened to the rotating shaft, and one end of the movable section is rotatably connected to the end of the fixed section. An air outlet is located on the movable section. The fixed section has a tubular structure and a valve plate with a valve hole. The upper end of the elastic column is connected to the movable section, and the lower end of the elastic column is sealed against the valve plate and covers the valve hole. There is a gap between the outer wall of the elastic column and the inner wall of the fixed section. A flow hole is located inside the elastic column, and the upper end of the flow hole is connected to the air outlet. An air inlet is located on the lower outer wall of the elastic column and is connected to the flow hole. Several arc-shaped feed plates are installed at corresponding positions on the steaming and frying section of the rotating shaft. A baffle is connected to one end of the feed plate near the cold pressing section, and a guide plate is connected to the other end of the feed plate away from the rotation direction. The guide plate is inclined away from the axis of the rotating shaft from the end connected to the baffle.

2. The woody oilseed pressing apparatus according to claim 1, characterized in that, The material scooping plate, baffle, and guide plate are all densely covered with numerous fine ventilation holes.

3. The woody oilseed pressing apparatus according to claim 1, characterized in that, The pitch of the spiral press blades in the cold pressing section gradually decreases towards the steaming and frying section, while the pitch of the spiral press blades in the hot pressing section gradually decreases away from the steaming and frying section.

4. The woody oilseed pressing apparatus according to claim 1, characterized in that, The movable section is equipped with a universal ball joint at one end, and the fixed section is equipped with a rotating groove that is compatible with the universal ball joint at the other end. The universal ball joint and the rotating groove are rotatably connected.

5. The woody oilseed pressing apparatus according to claim 1, characterized in that, The elastic column is equipped with an elastic positioning block, which is adapted to be installed in the fixed section. The outer wall of the elastic positioning block is provided with several anti-jamming grooves.

6. An oil pressing apparatus for woody oilseeds according to claim 1, 2, or 3, characterized in that, The steaming and frying section is connected to the exhaust pipe.

7. A method for extracting oil from woody oilseeds, characterized in that, The oil pressing operation using the woody oilseed pressing apparatus according to any one of claims 1 to 6 includes the following steps: S1, put the unsteamed woody oilseeds directly into the feed hopper, the shaft rotates, and the spiral pressing blades of the cold pressing section convey the woody oilseeds forward while pressing them in the spiral pressing to extract cold-pressed oil for collection. S2, the dried oil discharged from the cold pressing section falls into the steaming and frying section, the heating element heats the steaming and frying section, and the steam conveying pipe sends steam into the steaming and frying section to steam and fry the dried oil in the steaming and frying section. S3, the steamed and fried oil cake enters the hot pressing section. The spiral pressing blades of the hot pressing section convey the oil cake forward while pressing it to extract the hot pressed oil for collection.

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