CN107175841B - Spiral jatropha curcas crude oil squeezer - Google Patents
Spiral jatropha curcas crude oil squeezer Download PDFInfo
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- CN107175841B CN107175841B CN201710514100.XA CN201710514100A CN107175841B CN 107175841 B CN107175841 B CN 107175841B CN 201710514100 A CN201710514100 A CN 201710514100A CN 107175841 B CN107175841 B CN 107175841B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
- B30B9/14—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing operating with only one screw or worm
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/32—Discharging presses
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B1/00—Production of fats or fatty oils from raw materials
- C11B1/06—Production of fats or fatty oils from raw materials by pressing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Fats And Perfumes (AREA)
Abstract
The invention relates to a spiral jatropha curcas crude oil squeezer, which belongs to the field of biodiesel raw material oil squeezing machinery and comprises a frame, an oil squeezing device and a power device; the rack consists of a support frame, a plate frame and a motor frame, wherein the plate frame is welded at the upper end of the support frame to form a support frame with the support frame, two extrusion oil squeezing devices are arranged on the two plate frames, the motor frame is welded on the side wall of the support frame of one support frame, and a power device is arranged on the motor frame and connected with the extrusion oil squeezing devices. According to the invention, power is transmitted to the extrusion oil pressing device through the power device, the extrusion oil pressing device is used for pressing oil out of Jatropha curcas and realizing oil residue separation, so that the output and quality of Jatropha curcas crude oil are greatly improved, the extraction efficiency of Jatropha curcas crude oil is improved, the split and collection of oil and residue are ensured, the structure is simple, the operation is simple, the components are easy to install and replace, and the device can be used for the extrusion shell breaking oil pressing operation of oil crops with similar seed grains and sizes of Jatropha curcas.
Description
Technical Field
The invention belongs to the field of biodiesel raw oil squeezing machinery, and particularly relates to a spiral jatropha curcas raw oil squeezing machine.
Background
China is a large agricultural country, but the agricultural level of China is far different from that of developed countries, people occupy less energy, and the energy is not fully utilized. The Jatropha curcas seed has high oil content and can be processed to prepare biodiesel. The grease is an important component for producing biodiesel and occupies an indispensable position in actual production. So the high-efficiency and low-energy-consumption preparation of the grease becomes the urgent need of China at present.
Squeezing to obtain oil, hydraulic squeezing and spiral squeezing. In the oil industry, the hydraulic oil press has long squeezing period in oil extraction production, troublesome loading and unloading of cakes, heavy equipment and large occupied area, and limits the development of the hydraulic oil press to a certain extent. The screw oil press is a continuous pressing device which is accepted more at present, and has the remarkable characteristics of large single machine processing capacity, continuity, low labor intensity, good oil outlet effect, easy crushing of cake wafers and convenient realization of automatic production, so the screw oil press becomes a dominant model in the existing mechanical pressing separation device.
Therefore, it is necessary to provide a jatropha curcas crude oil squeezer which adopts a spiral squeezing mode, has a simple structure and is simple and convenient to operate, not only can solve the problem of high-efficiency continuous squeezing of jatropha curcas seed grains to produce oil, but also can separate oil residues.
Disclosure of Invention
In order to overcome the problems in the background technology, the invention provides a spiral jatropha curcas crude oil extractor, wherein power is transmitted to an extrusion oil extracting device through a power device, the extrusion oil extracting of jatropha curcas seed grains is realized through the extrusion oil extracting device, and oil residue separation is realized, so that the yield and quality of jatropha curcas crude oil are greatly improved.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the spiral jatropha curcas crude oil squeezer comprises a frame 1, an extrusion oil squeezing device 2 and a power device 3, wherein the frame 1 consists of a supporting frame 4, a plate frame 5 and a motor frame 6, the plate frame 5 is welded at the upper end of the supporting frame 4 to form two brackets with the supporting frame 4, the extrusion oil squeezing device 2 is arranged on the two plate frames 5, the motor frame 6 is welded on the side wall of the supporting frame 4 of one bracket, the power device 3 is arranged on the motor frame 6, and the power device 3 is connected with the extrusion oil squeezing device 2.
The extrusion oil squeezing device 2 comprises a steel column 7, a squeezing shaft 8, a feed inlet 9, a squeezing barrel 10, an oil collecting port 12, an oil outlet pipe 13 and a slag discharging port 14, wherein the steel column 7 is uniformly arranged on the circumferential direction of the outer walls of two end covers of the squeezing barrel 10, the funnel-shaped feed inlet 9 communicated with the inner cavity of the squeezing barrel 10 is arranged at the top of the right end of the squeezing barrel 10, the diameter of the squeezing shaft 8 is gradually increased from right to left, the squeezing shaft 8 is positioned in the middle of the squeezing barrel 10, two ends of the squeezing shaft 8 are arranged on the two end covers of the squeezing barrel 10 through bearings, the right end of the squeezing shaft 8 penetrates out of the right end cover of the squeezing barrel 10 and is connected with the power device 3, spiral conveying blades 15 with gradually reduced diameters from right to left are arranged on the squeezing shaft 8, the slag discharging port 14 communicated with the inner cavity of the squeezing barrel 10 is arranged at the bottom of the left end of the squeezing barrel 10, a strip-shaped oil collecting port 12 is arranged at the bottom of the squeezing barrel 10 between the slag discharging port 14 and the feed inlet 9, and the oil outlet pipe 13 is arranged at the bottom center of the oil collecting port 12.
The inner wall of the squeezing barrel 10 is uniformly provided with the bolt strips 11, the distance between two adjacent bolt strips 11 is 0.4-0.8cm, the bolt strips 11 are of a trapezoid structure, but the long sides of the bolt strips are arc-shaped and tangent to the inner wall of the squeezing barrel 10.
The bolt 11 on the inner wall of the bottom of the barrel 10 passes through the upper part of the oil collecting port 12 until reaching the right side of the opening of the slag discharging port 14.
The distance between the feeding port 9 and the right end cover of the barrel 10 is 2-3cm, and the distance between the slag discharging port 14 and the left end cover of the barrel 10 is less than 1cm.
The power device 3 comprises a motor 16, a belt wheel I17, a belt 18 and a belt wheel II 19, wherein the motor 16 is fixedly arranged on the motor frame 6, the belt wheel I17 is arranged on a rotating shaft of the motor 16, the belt wheel II 19 is arranged at the right end of the squeezing shaft 8, and the belt 18 is arranged on the belt wheel I17 and the belt wheel II 19.
The invention has the beneficial effects that:
1. the machine has simple structure, simple and convenient operation and easy assembly and disassembly of parts, and can be widely applied to the oil extraction operation of the jatropha curcas seed.
2. The invention uses screw press as the basic principle, and avoids the defects of long press cycle, troublesome loading and unloading of cakes, heavy equipment and large occupied area of the hydraulic press mode.
3. The invention uses belt transmission as power transmission mode, can alleviate impact and vibration load, has stable operation and no noise.
4. According to the invention, the Q235B equilateral angle steel is selected as a frame material, so that the vibration of the machine can be effectively reduced, and the stable operation of the whole machine is promoted.
5. The invention has the function of oil-residue separation, and ensures the collection quality of the Jatropha curcas crude oil and the further collection and utilization of residues.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the structure of the frame of the present invention;
FIG. 3 is a schematic view of an oil squeeze press according to the present invention;
FIG. 4 is a schematic diagram of a power plant according to the present invention;
FIG. 5 is a schematic view of the mounting structure of the latch according to the present invention.
In the figure, a 1-frame, a 2-extrusion oil pressing device, a 3-power device, a 4-supporting frame, a 5-plate frame, a 6-motor frame, a 7-steel column, an 8-pressing shaft, a 9-feeding hole, a 10-pressing cylinder, an 11-bolt, a 12-oil collecting hole, a 13-oil outlet pipe, a 14-slag discharging hole, a 15-spiral conveying blade, a 16-motor, a 17-belt wheel I, an 18-V-belt and a 19-belt wheel II.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1-4, the spiral jatropha curcas crude oil squeezer comprises a frame 1, an extrusion oil squeezing device 2 and a power device 3.
The frame 1 is composed of a supporting frame 4, a plate frame 5 and a motor frame 6, wherein the supporting frame 4 is formed by welding and fixing three Q235B equilateral angle steel, so that the vibration of the whole machine can be effectively reduced, and the stable operation of the whole machine is promoted. The grillage 5 is welded on the upper end of the supporting frame 4 and forms a bracket with the supporting frame 4, two brackets are arranged, the extrusion oil pressing device 2 is arranged on the two grillages 5, the grillage 5 is formed by processing a steel plate with the thickness of 1.5cm, the shape is approximately trapezoid, but the upper end is of a circular arc structure with a large round angle, thereby ensuring the aesthetic property of the frame 1 and facilitating the stable installation of the extrusion oil pressing device 2.
The extrusion oil squeezing device 2 comprises a steel column 7, a squeezing shaft 8, a feeding hole 9, a squeezing barrel 10, an oil collecting hole 12, an oil outlet pipe 13 and a slag discharging hole 14, wherein the steel column 7 is uniformly arranged on the circumferential directions of the outer walls of two end covers of the squeezing barrel 10, the squeezing barrel 10 is welded on the plate frame 5 through the steel column 7 with the circumferential distribution of the left end and the right end of the squeezing barrel 10, so that the fixed installation is realized, and the stability of the squeezing barrel 10 in the working process is ensured. The top of the right end of the pressing cylinder 10 is provided with a funnel-shaped feed inlet 9 communicated with the inner cavity of the pressing cylinder 10, the diameter of the pressing shaft 8 is gradually increased from right to left, the pressing shaft 8 is positioned in the middle of the pressing cylinder 10, two ends of the pressing shaft 8 are arranged on two end covers of the pressing cylinder 10 through bearings, the right end of the pressing shaft 8 penetrates out of the right end cover of the pressing cylinder 10 to be connected with the power device 3, the pressing shaft 8 is provided with a spiral conveying blade 15 with the diameter gradually reduced from right to left, jatropha curcas to be processed is added into the pressing cylinder 10 from the feed inlet 9, the pressing shaft 8 drives the spiral conveying blade 15 on the pressing shaft 8 to rotate under the driving of the power device 3, and the spiral conveying blade 15 conveys jatropha curcas from the right end of the pressing cylinder 10 to the left end in the rotation process. The bottom of the left end of the pressing cylinder 10 is provided with a slag discharge port 14 communicated with the inner cavity of the pressing cylinder 10, the bottom of the pressing cylinder 10 between the slag discharge port 14 and the feeding port 9 is provided with a strip-shaped oil collecting port 12, the bottom of the oil collecting port 12 is obliquely arranged to ensure that tung oil can be collected to the bottom of the pressing cylinder, an oil outlet pipe 13 is arranged in the center of the bottom of the oil collecting port 12, the pressed tung oil drops to the oil collecting port 12 in the pressing process, flows out of the oil outlet pipe 13 to be collected after being collected intensively through the oil collecting port 12, the tung oil is conveyed to the right end of the pressing cylinder 10 through a spiral conveying blade 15 and is discharged through the slag discharge port 14, and as a result, after the tung oil is pressed out, the tung oil is thoroughly conveyed to the right end of the pressing cylinder 10 through the spiral conveying blade 15, so that the tung oil efficiency is prevented from being influenced.
In the invention, a motor frame 6 is welded on the side wall of a supporting frame 4 of one of the two brackets, a power device 3 is arranged on the motor frame 6, and the power device 3 is connected with an extrusion oil press 2. The power device 3 comprises a motor 16, a belt wheel I17, a belt 18 and a belt wheel II 19, wherein the motor 16 is fixedly arranged on a motor frame 6, the belt wheel I17 is arranged on a rotating shaft of the motor 16, the belt wheel II 19 is arranged at the right end of the squeezing shaft 8, the belt 18 is arranged on the belt wheel I17 and the belt wheel II 19, the diameter of the belt wheel I17 is smaller than that of the belt wheel II 19, and when power is transmitted to the belt wheel II 19 through the belt 18, the original rotating speed output by the motor 16 can be reduced, so that the belt wheel II 19 drives the squeezing shaft 8 to realize high-quality oil squeezing of Jatropha curcas.
In the invention, the distance between the feed inlet 9 and the right end cover of the barrel 10 is 2-3cm, and the distance between the slag discharge opening 14 and the left end cover of the barrel 10 is less than 1cm, so that jatropha curcas is added into the barrel 10 through the feed inlet 9 which is 2-3cm away from the right end cover of the barrel 10 in the process that the barrel 8 drives the spiral conveying blade 15 to rotate, and the jatropha curcas can be prevented from being accumulated at the right end of the barrel 10; the distance between the slag discharge opening 14 and the left end cover of the press cylinder 10 is smaller than 1cm, so that the tung slag can be discharged from the slag discharge opening 14 as much as possible, and the tung slag is prevented from accumulating in the press cylinder 10.
The working procedure of this embodiment is:
when the invention is used for squeezing the jatropha curcas seed to extract oil, the oil press is placed at a working position, the motor 16 is electrified and started, the torque of the motor 16 is transmitted to the squeezing shaft 8 through the belt 18, the screw conveying blade 15 on the motor is driven by the squeezing shaft 8 to rotate, then the jatropha curcas seed is added into the squeezing cylinder 10 from the feeding port 9, the jatropha curcas oil in the jatropha curcas seed is squeezed under the squeezing conveying action of the variable-diameter squeezing shaft 8 and the screw conveying blade 15, the produced jatropha curcas crude oil flows out from the oil outlet pipe 13 to be collected after being collected intensively through the oil collecting port 12, the jatropha curcas slag is further conveyed by the screw conveying blade 15 driven by the variable-diameter squeezing shaft 8, and then falls down directly along the squeezing cylinder 10 to be collected intensively, so that the purposes of squeezing and collecting the jatropha curcas crude oil and the jatropha curcas slag are respectively realized.
Example 2
On the basis of embodiment 1, as shown in fig. 5, the inner wall of the barrel 10 is uniformly provided with the bolts 11, the distance between two adjacent bolts 11 is 0.4-0.8cm, the bolts 11 are in a trapezoid structure, but the long sides of the bolts are arc-shaped and tangent to the inner wall of the barrel 10, after the bolts 11 are arranged on the inner wall of the barrel 10, the outer edges of the spiral conveying blades 15 are tangent to the surfaces of the bolts 11, and the bolts 11 on the inner wall of the bottom of the barrel 10 transversely pass through from the upper part of the oil collecting port 12 until reaching the right side of the opening of the slag discharging port 14.
Under the extrusion conveying action of the pressing shaft 8 and the spiral conveying blades 15 with variable diameters, the pressing shaft 8, the spiral conveying blades 15 and the bolt 11 are used for simultaneously pressing the tung oil in the tung seed, the produced tung crude oil can be collected into the oil collecting ports 12 along the gaps between the bolt 11, the oil collecting ports 12 are collected in a concentrated mode and then flow out of the oil outlet pipe 13 to be collected, the tung oil can be timely guided out through the gaps between the bolt 11 arranged at intervals, and the condition that the extruded tung oil cannot be timely guided out and is mixed in tung residues to be output by the spiral conveying blades 15 is avoided, so that the waste of the tung oil is caused. Because the distance between two adjacent bolt strips 11 is 0.4-0.8cm, the capsules of Jatropha curcas are oval, 3-4cm long and 2.5-3cm in diameter; the jatropha curcas kernel is elliptical, and has a length of 1.8-2.0cm and a diameter of about 1.1 cm; when Jatropha curcas is extruded, slag particles of Jatropha curcas can not fall into a gap between two adjacent bolt strips 11, but are conveyed to the left end of a pressing cylinder 10 under the further conveying action of a spiral conveying blade 15 driven by a diameter-variable pressing shaft 8, and the bolt strips 11 on the inner wall of the bottom of the pressing cylinder 10 transversely pass through the upper part of an oil collecting port 12, so that the inlet of the oil collecting port 12 is separated from the pressing cylinder 10 through the bolt strips 11, the bolt strips 11 play a role in filtering, and the Jatropha curcas slag particles are prevented from falling into the oil collecting port 12 in the conveying process. The bolt 11 on the inner wall of the bottom of the squeezing barrel 10 passes through the upper part of the oil collecting port 12 until reaching the right side of the opening of the slag discharging port 14, so that no bolt 11 on the slag discharging port 14 passes through, and tung seed slag particles can be smoothly and rapidly discharged from the slag discharging port 14.
The invention uses screw squeezing as a fundamental principle, utilizes a motor and a power transmission device to transmit the power of the motor to a squeezing shaft with gradually enlarged diameter so as to realize the side-by-side squeezing of Jatropha curcas seed grains, the lower part of a squeezing sleeve is provided with an oil collecting device for collecting Jatropha curcas crude oil, the bottom of the left end is provided with a slag discharging port for discharging Jatropha curcas slag grains, the squeezing efficiency of Jatropha curcas crude oil is improved, a model mechanism is simplified, and the diversion and collection of oil and slag are ensured.
Finally, it is noted that the above-mentioned preferred embodiments are only intended to illustrate rather than limit the invention, and that, although the invention has been described in detail by means of the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (4)
1. A spiral jatropha curcas crude oil squeezer which is characterized in that: the spiral jatropha curcas crude oil extraction machine comprises a frame (1), an extrusion oil extraction device (2) and a power device (3), wherein the frame (1) consists of a support frame (4), a plate frame (5) and a motor frame (6), the plate frame (5) is welded at the upper end of the support frame (4) to form a support with the support frame (4), two supports are arranged, the extrusion oil extraction device (2) is arranged on the two plate frames (5), the motor frame (6) is welded on the side wall of the support frame (4) of one support, the power device (3) is arranged on the motor frame (6), and the power device (3) is connected with the extrusion oil extraction device (2);
the extrusion oil squeezing device (2) comprises a steel column (7), a squeezing shaft (8), a feed inlet (9), a squeezing barrel (10), oil collecting ports (12), oil outlet pipes (13) and slag discharging ports (14), wherein the steel column (7) is uniformly arranged on the circumferential direction of the outer walls of two end covers of the squeezing barrel (10), the funnel-shaped feed inlet (9) communicated with the inner cavity of the squeezing barrel (10) is arranged at the top of the right end of the squeezing barrel (10), the diameter of the squeezing shaft (8) is gradually increased from right to left, the squeezing shaft (8) is positioned in the middle of the squeezing barrel (10), the two ends of the squeezing shaft are arranged on two end covers of the squeezing barrel (10) through bearings, the right end cover of the squeezing shaft (8) penetrates out of the squeezing barrel (10) and is connected with the power device (3), spiral conveying blades (15) with gradually reduced diameters from right to left blades are arranged on the top of the squeezing shaft (8), the slag discharging ports (14) communicated with the inner cavity of the squeezing barrel (10) are arranged at the bottom of the left end of the squeezing barrel (10), the middle of the squeezing shaft (8) is arranged between the slag discharging ports (14) and the two end covers (12), and the oil collecting ports (12) are arranged at the bottom of the squeezing shaft (12);
the inner wall of the squeezing barrel (10) is uniformly provided with the bolt strips (11), the distance between two adjacent bolt strips (11) is 0.4-0.8cm, the bolt strips (11) are of a trapezoid structure, but the long side of each bolt strip is arc-shaped and is tangent to the inner wall of the squeezing barrel (10);
the distance between the feeding port (9) and the right end cover of the squeezing barrel (10) is 2-3cm, and the distance between the deslagging port (14) and the left end cover of the squeezing barrel (10) is less than 1cm.
2. The spiral jatropha curcas crude oil extractor of claim 1, wherein: the bolt (11) on the inner wall of the bottom of the barrel (10) passes through from the upper part of the oil collecting port (12) until reaching the right side of the opening of the slag discharging port (14).
3. A spiral jatropha curcas crude oil extractor according to claim 1 or 2, characterized in that: the power device (3) comprises a motor (16), a belt wheel I (17), a belt (18) and a belt wheel II (19), wherein the motor (16) is fixedly arranged on a motor frame (6), the belt wheel I (17) is arranged on a rotating shaft of the motor (16), the belt wheel II (19) is arranged at the right end of the squeezing shaft (8), and the belt (18) is arranged on the belt wheel I (17) and the belt wheel II (19).
4. A spiral jatropha curcas crude oil extractor according to claim 1 or 2, characterized in that: the frame (1) adopts Q235B equilateral angle steel as a material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710514100.XA CN107175841B (en) | 2017-06-29 | 2017-06-29 | Spiral jatropha curcas crude oil squeezer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710514100.XA CN107175841B (en) | 2017-06-29 | 2017-06-29 | Spiral jatropha curcas crude oil squeezer |
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| CN107175841A CN107175841A (en) | 2017-09-19 |
| CN107175841B true CN107175841B (en) | 2023-07-28 |
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| CN201710514100.XA Active CN107175841B (en) | 2017-06-29 | 2017-06-29 | Spiral jatropha curcas crude oil squeezer |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108943804A (en) * | 2018-06-15 | 2018-12-07 | 繁昌县小时候生态农业科技有限公司 | A kind of Oil press convenient for receiving oil slag |
| CN109170937B (en) * | 2018-08-21 | 2021-07-27 | 内蒙古民族大学 | Electric automatization processing equipment |
| CN112477233A (en) * | 2020-11-07 | 2021-03-12 | 贵州福正油桐发展有限公司 | Tung oil tree processing is with squeezing device |
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| CN107175841A (en) | 2017-09-19 |
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