Extraction device and method for extracting active substances from pressed oil of seeds

Abstract

The invention discloses an extraction device and method for extracting active substances through seed oil pressing, and belongs to the field of seed active substance extraction.The device comprises an oil-liquid separation barrel, a cylinder is slidably connected into the oil-liquid separation barrel, a liquid extraction head is slidably connected to the middle of the cylinder in a penetrating mode, and a conical groove is formed in the lower surface of the cylinder; the side wall of the cylinder is attached to the inner wall of the oil-liquid separation barrel, the liquid extraction head is connected to the liquid extraction pipe, the liquid extraction pipe can apply negative pressure into the oil-liquid separation barrel so that the cylinder can slide downwards in the oil-liquid separation barrel, and therefore the liquid extraction head can extract liquid gathered at the conical point of the conical groove; according to the device, due to the fact that liquid is gathered at the tip end of the conical groove, it is guaranteed that liquid at the lower layer can be extracted only after liquid at the upper layer is completely extracted through the liquid extraction head, and the oil-liquid separation degree is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of seed active substance extraction, in particular to an extraction device and method for extracting active substances by pressing seed oil. Background Art

[0002] In the field of seed processing and active substance extraction, extracting active substances from seeds is a task with important economic and scientific research value. After the seeds are processed by oil pressing, products such as oil and meal are usually obtained, and these products often contain rich active substances. In order to efficiently extract these active substances, the oil and meal need to be further processed and separated.

[0003] At present, there are certain limitations in the separation methods of common seed oils mixed with other solvents. Traditional separation methods may not be able to accurately separate the upper liquid and the lower liquid after stratification, resulting in the upper liquid mixing with the lower liquid, or the upper liquid remaining in the lower liquid, thus affecting the extraction purity and efficiency of the active substance. For example, some methods that use simple pouring or siphoning for separation are difficult to control the degree of separation and are prone to cross-contamination of liquids, making the subsequent extraction and purification process of active substances complicated, increasing production costs and time costs.

[0004] In addition, the existing separation devices may not be designed reasonably and cannot effectively promote the convergence and extraction of liquids. Some devices may not be able to automatically adjust the extraction position according to the stratification of the liquid, resulting in frequent manual intervention during the extraction process, which increases the difficulty and error of the operation. Moreover, when extracting liquid, some devices cannot ensure that the upper layer of liquid is completely extracted, causing some active substances to be wasted along with the incompletely extracted upper layer of liquid, reducing the extraction rate of active substances. Summary of the invention

[0005] The purpose of the present invention is to provide an extraction device and method for extracting active substances from seed oil, which solves the problem that the existing device has poor extraction effect on layered solution during the process of extracting gravity active substances.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an extraction device for extracting active substances from seeds by pressing oil, comprising an oil-liquid separation cylinder, a cylinder being slidably connected inside the oil-liquid separation cylinder, a liquid extraction head being slidably connected through the middle of the cylinder, a conical groove being provided on the lower surface of the cylinder, and the side wall of the cylinder being in contact with the inner wall of the oil-liquid separation cylinder, the liquid extraction head being connected to a liquid extraction tube, and the liquid extraction tube being able to apply negative pressure to the oil-liquid separation cylinder so that the cylinder slides down inside the oil-liquid separation cylinder, so that the liquid extraction head can extract the liquid gathered at the cone point of the conical groove.

[0007] Preferably, a volumetric pump is connected to the liquid extraction tube, a first pump outlet pipe is connected to the volumetric pump, the first pump outlet pipe is connected to the second pump outlet pipe, and an electromagnetic three-way valve is provided at the connecting portion between the first pump outlet pipe and the second pump outlet pipe, a density sensor is provided on the first pump outlet pipe between the electromagnetic three-way valve and the volumetric pump, and the electromagnetic three-way valve operates when the density sensor detects a change in fluid density in the first pump outlet pipe.

[0008] Preferably, a limit plate is fixedly connected to the cylinder, and a spring is fixedly connected between the limit plate and the cylinder. After the cylinder moves down to contact the bottom wall of the oil-liquid separation cylinder, the liquid extraction head can rely on negative pressure to overcome the elastic force of the spring and move down on the cylinder.

[0009] Preferably, a limiting frame is fixedly connected to the upper surface of the cylinder, and the limiting frame abuts against the upper surface of the limiting plate.

[0010] Preferably, a notch is provided at the port of the liquid extraction head.

[0011] Preferably, a stirring plate is rotatably connected to the bottom of the oil-liquid separation cylinder, and a first motor for driving the stirring plate to rotate is fixedly connected to the lower portion of the oil-liquid separation cylinder.

[0012] Preferably, a truncated cone groove is provided in the middle of the stirring plate, a drainage groove connected to the truncated cone groove is provided on the upper surface of the stirring plate, and the truncated cone groove and the liquid extraction head are located on the same axis.

[0013] Preferably, it further comprises a meal-liquid separation cylinder, the top of which is fixedly connected to a second motor, the output end of which is fixedly connected to a rotating shaft, the rotating shaft is fixedly connected to a crushing knife, and the crushing knife rotates in the meal-liquid separation cylinder;

[0014] A pressing plate is slidably connected to the rotating shaft, a through groove cooperating with the crushing knife is provided on the pressing plate, a circular ring is rotatably connected to the side wall of the pressing plate, a hydraulic rod is fixedly connected to the top of the meal-liquid separation cylinder, and the output end of the hydraulic rod is fixedly connected to the circular ring.

[0015] Preferably, it further includes a first evaporation cylinder, the second pump outlet pipe is connected to the first evaporation cylinder, a drainage pipe is connected between the meal-liquid separation cylinder and the first evaporation cylinder, a filter is connected to the drainage pipe, the top of the first evaporation cylinder is connected to a steam discharge pipe, and a valve is provided on the steam discharge pipe.

[0016] A method for extracting active substances by pressing oil from seeds, and an extraction device for extracting active substances by pressing oil from seeds, comprising the following steps:

[0017] The oil and meal generated after the seeds are pressed into the oil-liquid separation cylinder and the meal-liquid separation cylinder respectively, and methanol or ethanol is added into the oil-liquid separation cylinder and the meal-liquid separation cylinder respectively;

[0018] The first motor and the second motor are started, the stirring plate stirs the mixture of oil and methanol or ethanol, the crushing knife crushes the meal, and stirs the meal and methanol or ethanol at the same time, and the stirring plate and the crushing knife are left to stand after the stirring is completed, and the solution in the oil-liquid separation cylinder is separated into layers;

[0019] The displacement pump is started, and the displacement pump draws negative pressure to the tapered groove and the internal space of the oil-liquid separation cylinder connected to the tapered groove through the liquid extraction pipe. Under the action of the negative pressure, the cylinder moves downward, so that the cylinder gradually approaches the liquid surface and contacts the liquid surface. At this time, the solution gradually gathers in the tapered groove and rises, and finally falls into the extraction range of the liquid extraction head, and the upper layer of the solution after stratification is extracted. Then the liquid extraction head continues to move downward with the cylinder. In this process, the density sensor detects the density of the liquid in the first pump outlet pipe. When the density changes, the electromagnetic three-way valve operates, so that the subsequently extracted liquid is pumped into the first evaporation cylinder through the second pump outlet pipe;

[0020] After the cylinder moves downward and contacts the bottom wall of the oil-liquid separation cylinder, the downward movement of the cylinder is blocked. At this time, the negative pressure in the conical groove causes the liquid extraction head to overcome the elastic force of the spring and move downward to the bottom wall of the truncated cone groove, and finally the liquid in the oil-liquid separation cylinder is completely extracted.

[0021] The hydraulic rod on the upper part of the meal-liquid separation cylinder is extended, so that the pressing plate presses the meal-liquid mixture, so that the liquid in the meal-liquid mixture is pressurized and filtered through the filter screen on the discharge pipe and then discharged into the first evaporation cylinder;

[0022] After the hydraulic rod is fully extended and the solution in the oil-liquid separation cylinder is completely extracted, the displacement pump is controlled to reverse, and at this time the displacement pump applies negative pressure to the first evaporation cylinder, and the negative pressure acts on the meal-liquid separation cylinder, thereby promoting the separation of meal and liquid, and the liquid enters the first evaporation cylinder;

[0023] The first evaporation cylinder is started to heat the liquid collected therein, so that the liquid evaporates due to the heat to obtain an extract, which is the active substance of Taxus chinensis.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention provides a liquid extraction pipe to extract negative pressure toward the conical groove and the internal space of the oil-liquid separation cylinder connected to the conical groove. Under the action of the negative pressure, the cylinder moves downward, so that the cylinder gradually approaches the liquid surface and contacts the liquid surface. At this time, the solution gradually gathers in the conical groove and rises, and finally is in the extraction range of the liquid extraction head, and the upper layer of the solution after stratification is extracted. Since the liquid gathers at the tip of the conical groove, it is ensured that the liquid extraction head can completely extract the upper layer of liquid before extracting the lower layer of liquid, thereby ensuring the degree of oil-liquid separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 is a cross-sectional view of the oil-liquid separation cylinder of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the stirring plate of the present invention;

[0029] Figure 4 It is a cross-sectional view of the meal-liquid separation cylinder of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the pressing plate of the present invention;

[0031] Figure 6 It is a schematic diagram of the structure of the second evaporation cylinder and the third evaporation cylinder of the present invention.

[0032] In the figure: 1, base; 11, pedestal; 12, displacement pump; 121, first pump outlet pipe; 13, liquid extraction pipe; 14, electromagnetic three-way valve; 15, density sensor; 16, second pump outlet pipe; 2, oil-liquid separation cylinder; 21, first motor; 22, stirring plate; 221, arc-shaped protrusion; 222, drainage groove; 223, truncated cone groove; 23, cylinder; 231, conical groove; 232, limit frame; 24, extraction Liquid head; 241, notch; 25, limit plate; 26, spring; 3, meal-liquid separation cylinder; 31, second motor; 32, rotating shaft; 33, crushing knife; 34, pressing plate; 341, through groove; 35, ring; 36, hydraulic rod; 37, drain pipe; 38, filter screen; 4, first evaporation cylinder; 41, steam discharge pipe; 5, second evaporation cylinder; 51, negative pressure pipe; 52, three-way solenoid valve; 6, third evaporation cylinder. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Reference Figure 1-Figure 5 The present embodiment provides a technical solution: an extraction device for extracting active substances from seed oil, comprising an oil-liquid separation cylinder 2, a cylinder 23 is slidably connected inside the oil-liquid separation cylinder 2, a liquid extraction head 24 is slidably connected through the middle of the cylinder 23, a conical groove 231 is provided on the lower surface of the cylinder 23, and the side wall of the cylinder 23 is in contact with the inner wall of the oil-liquid separation cylinder 2, the liquid extraction head 24 is connected to the liquid extraction pipe 13, the liquid extraction pipe 13 can apply negative pressure to the oil-liquid separation cylinder 2 to make the cylinder 23 slide down in the oil-liquid separation cylinder 2, so that the liquid extraction head 24 can extract the liquid gathered at the cone point of the conical groove 231.

[0035] The oil generated after the seeds are pressed into the oil-liquid separation cylinder 2, methanol or ethanol is added to the oil-liquid separation cylinder 2, and the mixture is allowed to stand for stratification after stirring. The liquid extraction pipe 13 extracts negative pressure toward the conical groove 231 and the internal space of the oil-liquid separation cylinder 2 connected to the conical groove 231. Under the action of the negative pressure, the cylinder 23 moves downward, so that the cylinder 23 gradually approaches the liquid surface and contacts the liquid surface. At this time, the solution gradually gathers in the conical groove 231 and rises, and finally is in the extraction range of the liquid extraction head 24, and the upper layer of the solution after stratification is extracted. Since the liquid gathers at the tip of the conical groove 231, it is ensured that the liquid extraction head 24 can completely extract the upper layer of liquid before extracting the lower layer of liquid, thereby ensuring the degree of oil-liquid separation.

[0036] The liquid extraction tube 13 is connected to a displacement pump 12, a first pump outlet pipe 121 is connected to the displacement pump 12, the first pump outlet pipe 121 is connected to a second pump outlet pipe 16, and an electromagnetic three-way valve 14 is provided at the connecting portion between the first pump outlet pipe 121 and the second pump outlet pipe 16, a density sensor 15 is provided on the first pump outlet pipe 121 between the electromagnetic three-way valve 14 and the displacement pump 12, and the electromagnetic three-way valve 14 operates when the density sensor 15 detects a change in fluid density in the first pump outlet pipe 121.

[0037] The volumetric pump 12 provides power for the extraction of liquid. When the density sensor 15 does not detect the change in the density of the liquid in the extraction pipe 13, the electromagnetic three-way valve 14 does not operate. At this time, the upper layer of oil is extracted through the extraction pipe 13 and then pumped out through the first pump outlet pipe 121 to be collected. When the density sensor 15 detects the change in the density of the liquid in the first pump outlet pipe 121, the control system controls the operation of the electromagnetic three-way valve 14, so that the subsequently extracted liquid is pumped into the first evaporation cylinder 4 through the second pump outlet pipe 16, so that the layered solutions are extracted separately.

[0038] A limit plate 25 is fixedly connected to the cylinder 23, and a spring 26 is fixedly connected between the limit plate 25 and the cylinder 23. After the cylinder 23 moves down to contact the bottom wall of the oil-liquid separation cylinder 2, the liquid extraction head 24 can rely on negative pressure to overcome the elastic force of the spring 26 and move down on the cylinder 23.

[0039] After the cylinder 23 moves downward and contacts the bottom wall of the oil-liquid separation cylinder 2, the downward movement of the cylinder 23 is blocked. At this time, the negative pressure in the conical groove 231 causes the liquid extraction head 24 to overcome the elastic force of the spring 26 and move downward to the bottom wall of the conical groove 223, thereby finally completely extracting the liquid in the oil-liquid separation cylinder 2.

[0040] The upper surface of the cylinder 23 is fixedly connected to a limiting frame 232 , and the limiting frame 232 abuts against the upper surface of the limiting plate 25 .

[0041] The limiting frame 232 is provided to limit the sliding stroke of the liquid extraction head 24 to prevent the elastic force of the spring 26 from pushing the liquid extraction head 24 away from the cylinder 23 .

[0042] A notch 241 is formed at the port of the liquid extraction head 24 .

[0043] The notch 241 is provided so that the bottom end of the liquid extraction head 24 is blocked after contacting the bottom wall of the truncated cone groove 223, making it impossible to extract liquid.

[0044] The bottom of the oil-liquid separation cylinder 2 is rotatably connected to a stirring plate 22 , and the lower part of the oil-liquid separation cylinder 2 is fixedly connected to a first motor 21 for driving the stirring plate 22 to rotate.

[0045] The stirring plate 22 is provided with an arc-shaped protrusion 221. When the first motor 21 drives the stirring plate 22 to rotate, the arc-shaped protrusion 221 on the stirring plate 22 disturbs the solution in the oil-liquid separation cylinder 2 to promote the mixing of oil and alcohol.

[0046] A truncated cone groove 223 is formed in the middle of the stirring plate 22 , and a drainage groove 222 connected to the truncated cone groove 223 is formed on the upper surface of the stirring plate 22 . The truncated cone groove 223 and the liquid extraction head 24 are located on the same axis.

[0047] The height of the drainage groove 222 extending to the truncated cone groove 223 gradually decreases, so that the solution in the oil-liquid separation cylinder 2 slides along the drainage groove 222 into the truncated cone groove 223, so that the liquid extraction head 24 can extract the residual liquid after moving down into the truncated cone groove 223.

[0048] The invention also comprises a meal-liquid separation cylinder 3, the top of which is fixedly connected to a second motor 31, the output end of which is fixedly connected to a rotating shaft 32, the rotating shaft 32 is fixedly connected to a crushing knife 33, the crushing knife 33 rotates in the meal-liquid separation cylinder 3; a pressing plate 34 is slidably connected to the rotating shaft 32, a through groove 341 cooperating with the crushing knife 33 is formed on the pressing plate 34, a ring 35 is rotatably connected to the side wall of the pressing plate 34, a hydraulic rod 36 is fixedly connected to the top of the meal-liquid separation cylinder 3, and the output end of the hydraulic rod 36 is fixedly connected to the ring 35.

[0049] When the second motor 31 is started, the crushing blade 33 crushes the meal and stirs the meal and methanol or ethanol at the same time. The rotating shaft 32 is slidably connected with the pressing plate 34, so that when the rotating shaft 32 rotates, it can drive the pressing plate 34 to rotate synchronously, ensuring that the through groove 341 corresponds to the crushing blade 33. The ring 35 is rotatably connected with the pressing plate 34, that is, the movement of the pressing plate 34 is guaranteed not to be interfered with, and at the same time, the power of the hydraulic rod 36 can be transmitted to the pressing plate 34. When the hydraulic rod 36 is extended, it can squeeze the meal-liquid mixture, so that the liquid is separated after being squeezed.

[0050] It also includes a first evaporation cylinder 4, the second pump outlet pipe 16 is connected to the first evaporation cylinder 4, a drainage pipe 37 is connected between the meal-liquid separation cylinder 3 and the first evaporation cylinder 4, a filter screen 38 is connected to the drainage pipe 37, and the top of the first evaporation cylinder 4 is connected to a steam discharge pipe 41, and a valve is provided on the steam discharge pipe 41.

[0051] The second pump outlet pipe 16 and the liquid discharge pipe 37 are both connected to the first evaporation cylinder 4, so that the required liquid is discharged into the first evaporation cylinder 4. Finally, the first evaporation cylinder 4 is started to heat the liquid collected inside it, so that the liquid is evaporated by heat to obtain an extract, which is the active substance of Taxus chinensis. During heating, the valve on the steam discharge pipe 41 is opened to allow the steam to be discharged.

[0052] The device further comprises a base 1 , an oil-liquid separation cylinder 2 , a meal-liquid separation cylinder 3 and a first evaporation cylinder 4 are all connected to the base 1 , and a first motor 21 is connected to the base 1 through a base 11 .

[0053] A method for extracting active substances by pressing oil from seeds, and an extraction device for extracting active substances by pressing oil from seeds, comprising the following steps:

[0054] The oil and meal generated after the seeds are pressed into the oil-liquid separation cylinder 2 and the meal-liquid separation cylinder 3, respectively, and methanol or ethanol is added into the oil-liquid separation cylinder 2 and the meal-liquid separation cylinder 3, respectively;

[0055] The first motor 21 and the second motor 31 are started, the stirring plate 22 stirs the mixture of oil and methanol or ethanol, the crushing blade 33 crushes the meal, and stirs the meal and methanol or ethanol at the same time. After the stirring is completed by the stirring plate 22 and the crushing blade 33, the mixture is allowed to stand, and the solution in the oil-liquid separation cylinder 2 is separated into layers;

[0056] The displacement pump 12 is started, and the displacement pump 12 pumps negative pressure toward the tapered groove 231 and the internal space of the oil-liquid separation cylinder 2 connected to the tapered groove 231 through the liquid extraction pipe 13. Under the action of the negative pressure, the cylinder 23 moves downward, so that the cylinder 23 gradually approaches the liquid surface and contacts the liquid surface. At this time, the solution gradually gathers in the tapered groove 231 and rises, and finally falls into the extraction range of the liquid extraction head 24, and the upper layer of the solution after stratification is extracted. Then the liquid extraction head 24 continues to move downward with the cylinder 23. In this process, the density sensor 15 detects the density of the liquid in the first pump outlet pipe 121. When the density changes, the electromagnetic three-way valve 14 operates, so that the subsequently extracted liquid is pumped into the first evaporation cylinder 4 through the second pump outlet pipe 16;

[0057] After the cylinder 23 moves downward and contacts the bottom wall of the oil-liquid separation cylinder 2, the downward movement of the cylinder 23 is blocked. At this time, the negative pressure in the conical groove 231 causes the liquid extraction head 24 to overcome the elastic force of the spring 26 and move downward to the bottom wall of the truncated cone groove 223, and finally the liquid in the oil-liquid separation cylinder 2 is completely extracted.

[0058] The hydraulic rod 36 on the upper part of the meal-liquid separation cylinder 3 is extended, so that the pressing plate 34 applies pressure to the meal-liquid mixture, so that the liquid in the meal-liquid mixture is filtered through the filter screen 38 on the discharge pipe 37 and then discharged into the first evaporation cylinder 4;

[0059] After the hydraulic rod 36 is fully extended and the solution in the oil-liquid separation cylinder 2 is completely extracted, the displacement pump 12 is controlled to reverse, and at this time, the displacement pump 12 applies negative pressure to the first evaporation cylinder 4, and the negative pressure acts on the meal-liquid separation cylinder 3, thereby promoting the separation of meal and liquid, and the liquid enters the first evaporation cylinder 4;

[0060] The first evaporation cylinder 4 is started to heat the liquid collected therein, so that the liquid evaporates due to the heat to obtain an extract, which is the active substance of Taxus chinensis.

[0061] Example 2, reference Figure 6 In this embodiment, a second evaporation cylinder 5 is provided to collect the solution discharged from the meal-liquid separation cylinder 3 through the discharge pipe 37, and a third evaporation cylinder 6 collects the liquid discharged from the oil-liquid separation cylinder 2 through the second pump outlet pipe 16. The second pump outlet pipe 16 is also connected to the second evaporation cylinder 5 through a negative pressure pipe 51. When the solution in the oil-liquid separation cylinder 2 is completely discharged, the three-way solenoid valve 52 is controlled to make the second pump outlet pipe 16 connected to the second evaporation cylinder 5 through the negative pressure pipe 51. At this time, the positive displacement pump 12 is controlled to reverse to provide negative pressure separation for the meal-liquid separation cylinder 3.

[0062] The second evaporation cylinder 5 and the third evaporation cylinder 6 are both provided with steam discharge pipes 41. After the internal solutions of the two evaporation cylinders are heated and evaporated, extracts are obtained. The active substances of the seeds are obtained by mixing the two extracts.

[0063] The device can be used to extract active substances from yew.

[0064] In the above two embodiments, when the displacement pump 12 reverses, the electromagnetic three-way valve 14 maintains its open direction, so that positive pressure can be applied to the oil-liquid separation cylinder 2 through the liquid suction pipe 13, so that the cylinder 23 moves upward, providing assistance for the subsequent complete resetting of the cylinder 23.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An extraction device for extracting active substances from seed oil, characterized in that: The invention comprises an oil-liquid separation cylinder (2), wherein a cylinder (23) is slidably connected inside the oil-liquid separation cylinder (2), a liquid extraction head (24) is slidably connected through the middle of the cylinder (23), a conical groove (231) is provided on the lower surface of the cylinder (23), and the side wall of the cylinder (23) is in contact with the inner wall of the oil-liquid separation cylinder (2), and the liquid extraction head (24) is connected to a liquid extraction pipe (13), and the liquid extraction pipe (13) can apply negative pressure to the oil-liquid separation cylinder (2) so that the cylinder (23) slides down inside the oil-liquid separation cylinder (2), so that the liquid extraction head (24) can extract liquid gathered at the cone point of the conical groove (231).

2. The device for extracting active substances from seed oil according to claim 1, characterized in that: The liquid extraction pipe (13) is connected to a displacement pump (12), the displacement pump (12) is connected to a first pump outlet pipe (121), the first pump outlet pipe (121) is connected to a second pump outlet pipe (16), and an electromagnetic three-way valve (14) is provided at the connection portion between the first pump outlet pipe (121) and the second pump outlet pipe (16), a density sensor (15) is provided on the first pump outlet pipe (121) between the electromagnetic three-way valve (14) and the displacement pump (12), and the electromagnetic three-way valve (14) operates when the density sensor (15) detects a change in the density of the fluid in the first pump outlet pipe (121).

3. The device for extracting active substances from seed oil according to claim 2, characterized in that: A limit plate (25) is fixedly connected to the cylinder (23), and a spring (26) is fixedly connected between the limit plate (25) and the cylinder (23). After the cylinder (23) moves downward to contact the bottom wall of the oil-liquid separation cylinder (2), the liquid extraction head (24) can overcome the elastic force of the spring (26) by means of negative pressure and move downward on the cylinder (23).

4. The device for extracting active substances from seed oil according to claim 3, characterized in that: The upper surface of the cylinder (23) is fixedly connected to a limiting frame (232), and the limiting frame (232) abuts against the upper surface of the limiting plate (25).

5. The device for extracting active substances from seed oil according to claim 4, characterized in that: A notch (241) is provided at the port of the liquid extraction head (24).

6. The device for extracting active substances from seed oil according to claim 5, characterized in that: The bottom of the oil-liquid separation cylinder (2) is rotatably connected to a stirring plate (22), and the lower part of the oil-liquid separation cylinder (2) is fixedly connected to a first motor (21) for driving the stirring plate (22) to rotate.

7. The device for extracting active substances from seed oil according to claim 6, characterized in that: A truncated cone groove (223) is provided in the middle of the stirring plate (22), a drainage groove (222) connected to the truncated cone groove (223) is provided on the upper surface of the stirring plate (22), and the truncated cone groove (223) and the liquid extraction head (24) are located on the same axis.

8. The device for extracting active substances from seed oil according to claim 7, characterized in that: It also comprises a meal-liquid separation cylinder (3), the top of which is fixedly connected to a second motor (31), the output end of which is fixedly connected to a rotating shaft (32), the rotating shaft (32) is fixedly connected to a crushing knife (33), and the crushing knife (33) rotates in the meal-liquid separation cylinder (3); A pressing plate (34) is slidably connected to the rotating shaft (32), and a through groove (341) is provided on the pressing plate (34) for cooperating with the crushing knife (33). A circular ring (35) is rotatably connected to the side wall of the pressing plate (34). A hydraulic rod (36) is fixedly connected to the top of the meal-liquid separation cylinder (3), and an output end of the hydraulic rod (36) is fixedly connected to the circular ring (35).

9. The device for extracting active substances from seed oil according to claim 8, characterized in that: The invention also comprises a first evaporation cylinder (4), the second pump outlet pipe (16) being connected to the first evaporation cylinder (4), a drainage pipe (37) being connected between the meal-liquid separation cylinder (3) and the first evaporation cylinder (4), a filter screen (38) being connected to the drainage pipe (37), and a steam discharge pipe (41) being connected to the top of the first evaporation cylinder (4), and a valve being provided on the steam discharge pipe (41).

10. A method for extracting active substances by pressing oil from seeds, applied to the extraction device for extracting active substances by pressing oil from seeds as claimed in claim 9, characterized in that: The following steps are involved: The oil and meal generated after the seeds are pressed into the oil-liquid separation cylinder (2) and the meal-liquid separation cylinder (3), respectively, and methanol or ethanol is added into the oil-liquid separation cylinder (2) and the meal-liquid separation cylinder (3); The first motor (21) and the second motor (31) are started, the stirring plate (22) stirs the mixture of oil and methanol or ethanol, the crushing knife (33) crushes the meal, and stirs the meal and methanol or ethanol at the same time, and the stirring plate (22) and the crushing knife (33) are left to stand after the stirring is completed, and the solution in the oil-liquid separation cylinder (2) is separated into layers; The displacement pump (12) is started. The displacement pump (12) draws negative pressure toward the conical groove (231) and the internal space of the oil-liquid separation cylinder (2) connected to the conical groove (231) through the liquid extraction pipe (13). Under the action of the negative pressure, the cylinder (23) moves downward, so that the cylinder (23) gradually approaches the liquid surface and contacts the liquid surface. At this time, the solution gradually gathers in the conical groove (231) and rises, and finally falls within the extraction range of the liquid extraction head (24). The upper layer of the solution after stratification is extracted, and then the liquid extraction head (24) continues to move downward with the cylinder (23). During this process, the density sensor (15) detects the density of the liquid in the first pump outlet pipe (121). When the density changes, the electromagnetic three-way valve (14) operates, so that the subsequently extracted liquid is pumped into the first evaporation cylinder (4) through the second pump outlet pipe (16); After the cylinder (23) moves downward and contacts the bottom wall of the oil-liquid separation cylinder (2), the downward movement of the cylinder (23) is blocked. At this time, the negative pressure in the conical groove (231) causes the liquid extraction head (24) to overcome the elastic force of the spring (26) and move downward to the bottom wall of the truncated cone groove (223), so that the liquid in the oil-liquid separation cylinder (2) is finally completely extracted; The hydraulic rod (36) on the upper part of the meal-liquid separation cylinder (3) is extended, so that the pressing plate (34) applies pressure to the meal-liquid mixture, so that the liquid in the meal-liquid mixture is filtered through the filter screen (38) on the discharge pipe (37) and then discharged into the first evaporation cylinder (4); After the hydraulic rod (36) is fully extended and the solution in the oil-liquid separation cylinder (2) is completely extracted, the displacement pump (12) is controlled to reverse, and at this time, the displacement pump (12) applies negative pressure to the first evaporation cylinder (4), and the negative pressure acts on the meal-liquid separation cylinder (3), thereby promoting the separation of meal and liquid, and the liquid enters the first evaporation cylinder (4); The first evaporation cylinder (4) is started to heat the liquid collected therein, so that the liquid evaporates due to the heat to obtain an extract, which is the active substance of Taxus chinensis.

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