Diaphragm extraction device and diaphragm extraction method

Abstract

The present invention belongs to the technical field of battery diaphragm extraction equipment, and comprises: an extraction tank in which an accommodating space is defined; the partition plate is arranged in the extraction tank so as to divide the accommodating space into an extraction space and a recovery space; the roller group is arranged in the extraction space; the liquid inlet is formed in one end of the extraction tank; the baffle mechanism is arranged at one end of the partition plate so as to adjust the overflow width of the extraction liquid; the detection system is arranged on the extraction tank and is used for measuring the physical property of the extraction liquid; the temperature control device is arranged in the extraction tank so as to adjust the physical property of the extraction liquid; and the processor is respectively connected with the baffle mechanism and the detection system so as to receive the overflow width and the physical property and calculate the Reynolds number of the extraction liquid.

Description

Technical Field

[0001] The present invention relates to an extraction device, in particular to a device for extracting battery separators. Background Art

[0002] Countercurrent extraction is a technical means for separating mixtures, and is often used to extract organic matter in chemical processes, wherein: in the continuous countercurrent extraction process, the fluid dynamics of the extract has a significant impact on the efficiency of separating the mixture or the extraction effect. Specifically, in the technical field of lithium battery diaphragms, the use of traditional countercurrent extraction methods cannot effectively control the fluid properties of the extract. If the extract passes through the extraction tank in a laminar flow, it cannot take away the white oil at the bottom of the extraction tank, resulting in an excessively high oil content at the bottom of the diaphragm, and uneven oil content at the bottom and top of the diaphragm. A larger amount of extract and a longer extraction time are required to make the diaphragm reach an ideal state.

[0003] In summary, the conventional technology for extracting membranes can only rely on increasing the amount of extracting liquid fed to reduce the oil content of the membrane. However, when the amount of extracting liquid fed is increased, it will also lead to increased volatilization loss of the extracting liquid, strong odor, environmental pollution, and high recycling costs. In view of the above problems, it is necessary to provide a membrane extraction device that can adjust the fluid properties of the extracting liquid to improve the membrane extraction effect. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a membrane extraction device capable of adjusting the fluid properties of the extraction liquid to improve the membrane extraction effect.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a diaphragm extraction device, characterized in that it includes: an extraction tank, which defines a containing space inside; a partition, which is arranged in the extraction tank to divide the containing space into an extraction space and a recovery space; a roller group, which is arranged in the extraction space to move along the first direction with the diaphragm; a liquid inlet, which is arranged at one end of the extraction tank close to the extraction space, to supply extraction liquid to the extraction space along a second direction, wherein the second direction is opposite to the first direction; a baffle mechanism, which is arranged at one end of the baffle, to adjust the overflow width of the extraction liquid; a detection system, which is arranged on the extraction tank to measure the physical properties of the extraction liquid in the extraction space; a temperature control device, which is arranged in the extraction tank to adjust the physical properties of the extraction liquid in the extraction space; and a processor, which is respectively connected to the baffle mechanism and the detection system to receive the overflow width and the physical properties and calculate the Reynolds number of the extraction liquid.

[0006] More preferably, the baffle mechanism includes: a first baffle, which is arranged on the partition, wherein at least one recessed pattern is formed on the first baffle, and an overflow space is formed between the first baffle and each of the recessed patterns; and a second baffle, which is arranged corresponding to the first baffle, wherein: at least one blocking pattern is formed on the second baffle, wherein each of the blocking patterns is respectively arranged corresponding to each of the recessed patterns, and the second baffle can be moved relative to the first baffle to move from a first position to a second position, and adjust the area of ​​the overflow space covered by the blocking pattern.

[0007] More preferably, when the second baffle is located at the first position, the area of ​​the overflow space blocked by the blocking pattern is minimized, so that the overflow width of the extraction liquid is maximized; and when the second baffle is located at the second position, the area of ​​the overflow space blocked by the blocking pattern is maximized, and the overflow width of the extraction liquid is minimized.

[0008] More preferably, the shape of the concave figure includes a semicircle, a triangle, or a quadrilateral; and the shape of the shielding figure includes a semicircle, a triangle, or a quadrilateral, and the concave figure and the shielding figure may be the same or different.

[0009] More preferably, the detection system comprises: a density meter for detecting the density of the extraction liquid in the extraction space; a viscometer for detecting the viscosity of the extraction liquid in the extraction space; or a thermometer for detecting the temperature of the extraction liquid in the extraction space.

[0010] More preferably, the roller group includes, in sequence along the first direction: a first guide roller, a second guide roller, a third guide roller, a fourth guide roller, and a fifth guide roller, wherein: the first guide roller, the third guide roller, and the fifth guide roller are arranged at a height of H1; and the second guide roller and the fourth guide roller are arranged at a height of H2, and H1>H2.

[0011] More preferably, the Reynolds number (Re) is calculated according to the following formula:

[0012]

[0013] Wherein Q is the flow rate of the extraction liquid passing through the baffle mechanism per unit time, v is the kinematic viscosity of the extraction liquid in the extraction space, and L is the flow width of the extraction liquid when flowing through the baffle mechanism, that is, the overflow width.

[0014] More preferably, it is characterized in that: the first direction is an extension direction moving from the recovery space to the extraction space; and the second direction is an extension direction moving from the extraction space to the recovery space.

[0015] More preferably, the temperature control device comprises: a first electric heating plate, which is arranged on the side of the extraction space in contact with the partition; and a second electric heating plate, which is arranged on the side of the extraction space farthest from the recovery space.

[0016] More preferably, the method further comprises: a stirring device disposed in the extraction space to stir the extraction liquid in the extraction space.

[0017] The present invention further provides a membrane extraction method, characterized in that it comprises: (S1) obtaining the membrane extraction device as described above; (S2) starting the stirring device to stir the extract in the extraction space, and after stirring for a preset time, entering step (S3); (S3) using the detection system to measure the density of the upper layer and the lower layer of the extract in the extraction space, and using the processor to determine whether the densities of the two are consistent, wherein: if the densities are consistent, entering step (S4); if the densities are inconsistent, repeating step (S2); (S4) using the processor to calculate the Reynolds number of the extract in the extraction space, wherein: if the If the Reynolds number is less than 4500, the process proceeds to step (S5); if the Reynolds number is greater than 8000, the process proceeds to step (S6); if the Reynolds number is between 4500 and 8000, the process proceeds to step (S7); (S5) according to the Reynolds number, the baffle mechanism is controlled to shorten the overflow width, or the temperature control device is controlled to increase the temperature of the extraction liquid, and the process returns to step (S4); (S6) according to the Reynolds number, the baffle mechanism is controlled to increase the overflow width, or the temperature control device is controlled to lower the temperature of the extraction liquid, and the process returns to step (S4); and (S7) the extraction liquid meets the requirements and the process ends.

[0018] The effect of the present invention relative to the prior art is that: the membrane extraction device of the present invention is provided with a baffle mechanism, so the overflow width of the extracting liquid flowing from the extraction space to the recovery space can be controlled by the baffle mechanism, and the Reynolds value of the extracting liquid can be regulated so that its fluid performance can improve the extraction effect on the membrane. In addition, the membrane extraction device of the present invention is provided with a temperature control device, so the kinematic viscosity of the extracting liquid can be controlled by heating or cooling the extracting liquid, and the Reynolds value of the extracting liquid can be regulated so that its fluid performance can improve the extraction effect on the membrane. Specifically, the present invention can control the extracting liquid to extract the membrane with the most appropriate fluid performance, so as to quickly and evenly remove the white oil on the membrane, and at the same time clean the white oil at the bottom of the extraction tank to prevent the white oil from adhering to the surface of the membrane again, so that the membrane after the extraction is completed can directly meet the processing requirements of the lithium ion battery. In addition, since the membrane extraction device and the membrane extraction method provided by the present invention do not need to increase the liquid intake of the extracting liquid, waste, pollution, and cost loss caused by the extracting liquid can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figures 1A to 1B A series of stereograms are used to illustrate the structural features of the membrane extraction device;

[0020] Figure 2A It is a three-dimensional exploded view, used to illustrate the structural features of the baffle mechanism;

[0021] Figures 2B to 2C is a series of stereograms to illustrate the manner of adjusting the overflow width;

[0022] Figures 3A to 3B is a series of plan views to illustrate the manner in which the overflow width may be adjusted;

[0023] Figure 4 It is a flow chart for illustrating the steps of the membrane extraction method. DETAILED DESCRIPTION

[0024] In order to make the above and / or other purposes, effects, and features of the present invention more clearly understood, preferred embodiments are specifically described below in detail:

[0025] The object of the present invention is to provide a membrane extraction device 1, wherein Figure 1AAs shown, it comprises: an extraction tank 2, which defines a containing space 3 inside; a partition 4, which is arranged in the extraction tank 2 to divide the containing space 3 into an extraction space 5 and a recovery space 6; a roller group 7, which is arranged in the extraction space 5 to move along a first direction 8 with the diaphragm; a liquid inlet 9, which is arranged at one end of the extraction tank 2 close to the extraction space 5, to supply the extraction liquid to the extraction space 5 along a second direction 10, wherein the second direction 10 is opposite to the first direction 8; a baffle mechanism 12, which is arranged at one end of the partition 4 to adjust the overflow width of the extract; a detection system 13 is disposed on the extraction tank 2 to measure the physical properties of the extract in the extraction space 5; a temperature control device 14 is disposed in the extraction tank 2 to adjust the physical properties of the extract in the extraction space 5; and a processor 15 is connected to the baffle mechanism 12 and the detection system 13, respectively, to receive the overflow width and the physical properties, and calculate the Reynolds number of the extract. In a preferred embodiment, the first direction 8 is an extension direction moving from the recovery space 6 to the extraction space 5; and the second direction 10 is an extension direction moving from the extraction space 5 to the recovery space 6. In another preferred embodiment, the first direction 8 and the second direction 10 are parallel to each other, but not limited thereto. In another preferred embodiment, the processor 15 is disposed on the extraction tank 2, a wearable electronic device, a computer, a mobile phone, a tablet, a remote controller, or other mobile devices, and can be selectively electrically or signal-connected to the baffle mechanism 12 and the detection system 13. In another preferred embodiment, it further comprises: a stirring device 11, which is disposed in the extraction space 5 to stir the extraction liquid in the extraction space 5.

[0026] More preferably, in order to adjust the temperature of the extract, the temperature control device 14 comprises a refrigeration device or a heating device. Specifically, in order to increase the temperature of the extract, Figures 1A to 1B As shown, the temperature control device 14 includes: a first electric heating plate 29, which is arranged on the side where the extraction space 5 contacts the partition 4; and a second electric heating plate 30, which is arranged on the side where the extraction space 5 is farthest from the recovery space 6. In a preferred embodiment, in order to reduce the temperature of the extract, the temperature control device 14 includes: a first cooling plate, which is arranged on the side where the extraction space 5 contacts the partition 4; and a second cooling plate, which is arranged on the side where the extraction space 5 is farthest from the recovery space 6.

[0027] Specifically, by calculating the value of the Reynolds number (Re), the flow type of the extract can be determined, wherein: when the Reynolds number (Re) of the extract is less than 2000, its flow mode is laminar flow, and the fluid layers do not mix with each other, but flow smoothly and orderly; when the Reynolds number (Re) of the extract is greater than 4000, its flow mode is turbulent flow, and the fluid layers mix strongly, and the flow is complex and disordered; and when the Reynolds number (Re) of the extract is between 2000 and 4000, its flow mode is in a transitional state, and has flow characteristics between laminar flow and turbulent flow. Specifically, compared with the method used in the conventional process, the present invention controls the Reynolds number (Re) of the extract to make it flow in a turbulent flow, so as to effectively remove the white oil on the diaphragm, and at the same time clean the white oil deposited at the bottom of the extraction tank 2 to reduce the oil content of the diaphragm. In addition, the present invention can also reduce the amount of extract liquid inlet, and improve the effect of countercurrent extraction separation of white oil on the diaphragm by adjusting the overflow width (L) or temperature of the extract.

[0028] More preferably, in order to measure the physical properties of the extract, the detection system 13 includes: a density meter 21 for detecting the density of the extract in the extraction space 5; a viscometer 22 for detecting the viscosity of the extract in the extraction space 5; or a thermometer 23 for detecting the temperature of the extract in the extraction space 5. Specifically, in order to ensure the uniformity of the extract extracting the diaphragm, so as to avoid the white oil of different concentrations or thicknesses remaining at different positions of the diaphragm, which affects the performance of the diaphragm in the subsequent preparation of batteries, wherein: the extract is stirred by the stirring device 11 so that the density of the extract at different height positions in the extraction space 5 is consistent. In a preferred embodiment, the temperature of the extract affects the viscosity. When the temperature is higher, the viscosity is lower. The viscosity also affects the Reynolds number of the extract. Therefore, the change of the Reynolds number of the extract can be calculated by measuring the two physical properties. In another preferred embodiment, the viscosity measured by the viscometer 22 is the kinematic viscosity (v), but it is not limited thereto. In another preferred embodiment, the density of the extraction liquid is 1.18 to 1.32, or the flow rate of the extraction liquid is 2 to 6 cubic meters per hour, but not limited thereto.

[0029] More preferably, in order to ensure that each position of the diaphragm is in sufficient contact and reaction with the extraction liquid to effectively remove the white oil on the diaphragm, the roller group 7 includes, in sequence along the first direction 8: a first guide roller 24, a second guide roller 25, a third guide roller 26, a fourth guide roller 27, and a fifth guide roller 28, wherein: the first guide roller 24, the third guide roller 26, and the fifth guide roller 28 are arranged at a height of H1; and the second guide roller 25 and the fourth guide roller 27 are arranged at a height of H2, and H1>H2.

[0030] Preferably, in order to finely control the overflow width of the extracting liquid, adjust the Reynolds number of the extracting liquid, and make the fluid performance of the extracting liquid more efficient and uniform in removing the white oil on the diaphragm, as Figures 2A to 2C As shown, the baffle mechanism 12 includes: a first baffle 16, which is arranged on the partition 4, wherein at least one recessed pattern 17 is formed on the first baffle 16, and an overflow space 18 is formed between the first baffle 16 and each of the recessed patterns 17; and a second baffle 19, which is arranged corresponding to the first baffle 16, wherein: at least one shielding pattern 20 is formed on the second baffle 19, wherein each of the shielding patterns 20 is respectively arranged corresponding to each of the recessed patterns 17, and the second baffle 19 can be moved relative to the first baffle 16 to move from a first position to a second position, and adjust the area of ​​the overflow space 18 covered by the shielding pattern 20. In a preferred embodiment, when the second baffle 19 is located at the first position, the area of ​​the overflow space 18 blocked by the blocking pattern 20 is the minimum value, so that the overflow width of the extract is the maximum value; and when the second baffle 19 is located at the second position, the area of ​​the overflow space 18 blocked by the blocking pattern 20 is the maximum value, and the overflow width of the extract is the minimum value, but the first position and the second position are not limited to the above, and the initial position of the second baffle 19 relative to the first baffle 16 can be freely set, so that the overflow width of the extract has a more flexible adjustment space. In another preferred embodiment, if Figure 3A As shown, the overflow space 18 on the first baffle 16 is not shielded by the shielding pattern 20 on the second baffle 19, and the overflow width of the extract is the original length LA; and Figure 3B As shown, the overflow space 18 on the first baffle 16 is shielded by the shielding pattern 20 on the second baffle 19. At this time, the overflow width of the extraction liquid is shortened to LB+LC. By the above method, the overflow width of the extraction liquid can be adjusted, and then the Reynolds number (Re) of the extraction liquid can be adjusted.

[0031] More preferably, in order to make the shielding pattern 20 cover the recessed pattern 17 to adjust the overflow width of the extraction liquid, the shape of the recessed pattern 17 includes a semicircle, a triangle, or a quadrilateral; and the shape of the shielding pattern 20 includes a semicircle, a triangle, or a quadrilateral, and the recessed pattern 17 and the shielding pattern 20 can be the same or different. In a preferred embodiment, the quadrilateral includes a rectangle, a square, a trapezoid, or a rhombus, but is not limited thereto. In another preferred embodiment, the recessed patterns 17 formed on the first blocking sheet 16 are equidistant and arranged in sequence along an extension direction to form a sawtooth structure, wherein: a sawtooth pattern is formed between two recessed patterns 17, and the shape of the sawtooth pattern includes a semicircle, a triangle, or a quadrilateral, but is not limited thereto. In another preferred embodiment, the second baffle 19 has the same shape as the first baffle 16, the shielding pattern 20 is a sawtooth pattern formed between two recessed patterns 17, and the space formed between two shielding patterns 20 is the overflow space 18. In another preferred embodiment, the first baffle 16 can be slightly larger or slightly smaller than the second baffle 19, but is not limited thereto.

[0032] More preferably, the Reynolds number (Re) is calculated according to the following formula:

[0033]

[0034] Wherein Q is the flow rate of the extraction liquid passing through the baffle mechanism 12 per unit time, v is the kinematic viscosity of the extraction liquid in the extraction space 5, and L is the flow width of the extraction liquid when flowing through the baffle mechanism 12, that is, the overflow width.

[0035] 《The following is an explanation of the derivation of the calculation formula for the Reynolds number (Re)》

[0036] First, as shown in Table 1 below, the Reynolds number (Re) of the extract can be calculated by Formula 1, wherein in Formula 1, ρ is the density of the extract, V is the flow rate of the extract, D is the equivalent diameter, and μ is the dynamic viscosity of the extract. The overflow means that the height of the extract has reached the highest point of the partition 4 and flows through the pores or gaps on the baffle mechanism 12, wherein the portion of the extract flowing through the baffle mechanism 12 is overflow.

[0037] Table 1

[0038]

[0039] In addition, in the extraction tank 2, the width-to-height ratio of the overflow portion of the extract is large, which is 4500:6 to 4500:14, as shown in the following Table 2. According to Formula 2, it can be known that the equivalent diameter (D) is approximately 4 times the overflow height of the extract. Therefore, it can be understood that when the inlet amount of the extract is increased, the overflow height can be increased, and the equivalent diameter (D) can be increased, thereby increasing the Reynolds number (Re) of the extract. However, increasing the inlet amount of the extract will lead to problems such as waste of the extract, pollution, and increased cost. Therefore, it is necessary to find technical means other than increasing the inlet amount to control the Reynolds number of the extract.

[0040] Table 2

[0041]

[0042] Next, as shown in Table 3 below, in order to derive the calculation formula for the final Reynolds number, Formulas 3 to 5 are provided, wherein: V is the flow rate of the extract, Q is the flow rate of the extract, S is the flow channel area of ​​the extract, d is the overflow height of the extract, L is the overflow width of the extract, v is the kinematic viscosity of the extract, μ is the dynamic viscosity of the extract, and ρ is the density of the extract. According to the results of formulas 1 to 5, formula 6 can be derived, which is the formula used by the present invention to control the Reynolds number of the extract. According to formula 6, it can be known that when the flow rate (Q) of the extract is fixed, the Reynolds number (Re) of the extract can be adjusted by adjusting the overflow width (L) of the extract or the kinematic viscosity (v) of the extract. The kinematic viscosity (v) is affected by temperature. When the temperature is higher, the kinematic viscosity (v) of the extract is lower. Therefore, the value of the Reynolds number can also be controlled by regulating the temperature of the extract, so as to optimize the extraction effect under the condition that the extract is quantitative, so as to efficiently and evenly extract the diaphragm and remove the white oil on the diaphragm.

[0043] Table 3

[0044]

[0045] The present invention further provides a membrane extraction method, characterized in that: Figure 4As shown, it includes: (S1) obtaining the membrane extraction device 1 as described above; (S2) starting the stirring device 11 to stir the extract in the extraction space 5, and after stirring for a preset time, entering step (S3); (S3) using the detection system 13 to measure the density of the upper layer and the lower layer of the extract in the extraction space 5, and using the processor 15 to determine whether the densities of the two are consistent, wherein: if the densities are consistent, entering step (S4); if the densities are inconsistent, re-performing step (S2); (S4) using the processor 15 to calculate the Reynolds number of the extract in the extraction space 5, wherein: if the Reynolds number is less than 4 500, proceed to step (S5); if the Reynolds number is greater than 8000, proceed to step (S6); if the Reynolds number is between 4500 and 8000, proceed to step (S7); (S5) according to the size of the Reynolds number, control the baffle mechanism 12 to shorten the overflow width, or control the temperature control device 14 to increase the temperature of the extraction liquid, and return to step (S4); (S6) according to the size of the Reynolds number, control the baffle mechanism 12 to increase the overflow width, or control the temperature control device 14 to lower the temperature of the extraction liquid, and return to step (S4); and (S7) the extraction liquid has met the requirements and ends.

[0046] The present invention has the following effects compared to the prior art: the membrane extraction device 1 of the present invention is provided with a baffle mechanism 12, so the overflow width of the extracting liquid flowing from the extraction space 5 to the recovery space 6 can be controlled by the baffle mechanism 12, and the Reynolds value of the extracting liquid can be regulated so that its fluid performance can improve the extraction effect on the membrane. In addition, the membrane extraction device 1 of the present invention is provided with a temperature control device 14, so the kinematic viscosity of the extracting liquid can be controlled by heating or cooling the extracting liquid, and the Reynolds value of the extracting liquid can be regulated so that its fluid performance can improve the extraction effect on the membrane. Specifically, the present invention can control the extracting liquid to extract the membrane with the most appropriate fluid performance, so as to quickly and evenly remove the white oil on the membrane, and at the same time clean the white oil at the bottom of the extraction tank 2 to prevent the white oil from adhering to the surface of the membrane again, so that the membrane after the extraction is completed can directly meet the processing requirements of the lithium-ion battery. In addition, since the membrane extraction device 1 and the membrane extraction method provided by the present invention do not need to increase the liquid intake of the extracting liquid, waste, pollution, and cost loss caused by the extracting liquid can be prevented.

[0047] However, what is described above is only a preferred embodiment of the present invention, but it cannot be used to limit the patent protection scope of the present invention; therefore, all simple equivalent changes and modifications made according to the patent protection scope of the present invention and the contents of the specification still fall within the patent protection scope of the present invention.

Claims

1. A membrane extraction device, characterized in that: Include: An extraction tank having an accommodating space defined therein; A partition plate is disposed in the extraction tank to separate the accommodating space into an extraction space and a recovery space; A roller set is disposed in the extraction space to move the diaphragm along a first direction; a liquid inlet, which is disposed at one end of the extraction tank close to the extraction space, so as to supply the extraction liquid to the extraction space along a second direction, wherein the second direction is opposite to the first direction; A baffle mechanism is disposed at one end of the partition plate to adjust the overflow width of the extraction liquid; A detection system is disposed on the extraction tank to measure the physical properties of the extraction liquid in the extraction space; A temperature control device is disposed in the extraction tank to adjust the physical properties of the extraction liquid in the extraction space; as well as The processor is connected to the baffle mechanism and the detection system respectively to receive the overflow width and the physical property and calculate the Reynolds number of the extraction liquid.

2. The membrane extraction device according to claim 1, characterized in that The baffle mechanism comprises: A first baffle is disposed on the partition, wherein at least one concave pattern is formed on the first baffle, and an overflow space is formed between the first baffle and each of the concave patterns; and The second baffle is arranged corresponding to the first baffle, wherein: at least one blocking pattern is formed on the second baffle, wherein each of the blocking patterns is respectively arranged corresponding to each of the recessed patterns, and the second baffle can be moved relative to the first baffle to move from a first position to a second position, and adjust the area of ​​the overflow space covered by the blocking pattern.

3. The membrane extraction device according to claim 2, characterized in that : When the second blocking piece is located at the first position, the area of ​​the overflow space blocked by the blocking pattern is the minimum value, so that the overflow width of the extraction liquid is the maximum value; as well as When the second blocking piece is located at the second position, the area of ​​the overflow space blocked by the blocking pattern is maximized, and the overflow width of the extraction liquid is minimized.

4. The membrane extraction device according to claim 2, characterized in that : The shape of the concave pattern includes a semicircle, a triangle, or a quadrilateral; and The shape of the shielding pattern includes a semicircle, a triangle, or a quadrilateral, and the concave pattern and the shielding pattern may be the same or different.

5. The membrane extraction device according to claim 1, characterized in that The detection system comprises: A densitometer, used to detect the density of the extraction liquid in the extraction space; A viscometer, used to detect the viscosity of the extraction liquid in the extraction space; or A thermometer is used to detect the temperature of the extraction liquid in the extraction space.

6. The membrane extraction device according to claim 1, characterized in that : The roller group includes, in sequence along the first direction: a first guide roller, a second guide roller, a third guide roller, a fourth guide roller, and a fifth guide roller, wherein: the first guide roller, the third guide roller, and the fifth guide roller are arranged at a height of H1; and the second guide roller and the fourth guide roller are arranged at a height of H2, and H1>H2.

7. The membrane extraction device according to claim 1, characterized in that The Reynolds number (Re) is calculated according to the following formula: Wherein Q is the flow rate of the extraction liquid passing through the baffle mechanism per unit time, v is the kinematic viscosity of the extraction liquid in the extraction space, and L is the flow width of the extraction liquid when flowing through the baffle mechanism, that is, the overflow width.

8. The membrane extraction device according to claim 1, characterized in that : The first direction is an extending direction moving from the recovery space to the extraction space; and The second direction is an extending direction moving from the extraction space toward the recovery space.

9. The membrane extraction device according to claim 1, characterized in that The temperature control device comprises: A first electric heating plate is disposed on a side of the extraction space in contact with the partition; and The second electric heating plate is arranged on the side farthest from the extraction space and the recovery space.

10. The membrane extraction device according to claim 1, characterized in that It further comprises: a stirring device, which is disposed in the extraction space to stir the extraction liquid in the extraction space.

11. A membrane extraction method, characterized in that: Include: (S1) obtaining the membrane extraction device as claimed in claim 10; (S2) starting the stirring device to stir the extraction liquid in the extraction space, and after the stirring continues for a preset time, entering step (S3); (S3) measuring the density of the upper layer and the lower layer of the extract in the extraction space with the detection system, and determining with the processor whether the densities of the two layers are consistent, wherein: if the densities are consistent, proceeding to step (S4); if the densities are inconsistent, re-performing step (S2); (S4) calculating the Reynolds number of the extract in the extraction space with the processor, wherein: if the Reynolds number is less than 4500, proceeding to step (S5); if the Reynolds number is greater than 8000, proceeding to step (S6); if the Reynolds number is between 4500 and 8000, proceeding to step (S7); (S5) according to the Reynolds number, controlling the baffle mechanism to shorten the overflow width, or controlling the temperature control device to increase the temperature of the extraction liquid, and returning to step (S4); (S6) controlling the baffle mechanism to increase the overflow width, or controlling the temperature control device to lower the temperature of the extract according to the Reynolds number, and returning to step (S4); and (S7) The extraction liquid has met the requirements and the process is finished.

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