Drive unit, extraction unit and extraction method for wet membrane extraction

Abstract

This invention relates to the field of wet-process diaphragm production technology, and proposes a transmission device, extraction device, and extraction method for wet-process diaphragm extraction. The device includes a machine body and several floating rollers arranged sequentially on the machine body. Each floating roller has a shaft cavity with an inlet and several floating holes leading to the outside of the roller. The invention also provides an extraction device and method for wet-process diaphragm extraction. These technical solutions solve the problems of diaphragm scratches, wrinkles, and breaks caused by transmission issues during the extraction process in existing wet-process diaphragm production.

Description

Technical Field

[0001] This invention relates to the field of transmission roller technology, and more specifically, to a transmission device, extraction device, and extraction method for wet diaphragm extraction. Background Technology

[0002] In the production of wet-process lithium battery separators, volatile solvents (such as dichloromethane) are used to extract paraffin oil from the separator. In the extraction space, the separator is finally transported out of the extraction space via multiple tank area drive rollers, thus completing the extraction process.

[0003] The diaphragm is powered within the extraction chamber by either a motor driving a roller to supply power to the diaphragm, or a motor driving a drive shaft, which then transmits power to a driven shaft via sprockets and chains. Both methods present potential production risks. In the method where the drive shaft transmits power to the driven shaft via a chain and sprockets, the friction between the sprockets and chain generates metal debris, contaminating the extraction liquid throughout the extraction chamber. Furthermore, the chain loosens over time, potentially causing tooth skipping and loss of rotation of the drive shaft, which in turn affects the shaft's speed, leading to diaphragm wrinkles, scratches, and even potential breakage due to stalling. A direct drive shaft connection between the drive shaft and the diaphragm surface also presents the risk of wrinkles and scratches due to direct contact between the roller surface and the diaphragm surface. Summary of the Invention

[0004] This invention proposes an extraction diaphragm transmission device based on wet diaphragm production, which solves the technical problems of diaphragm scratches, wrinkles, and membrane breaks caused by transmission during the extraction process in wet diaphragm production.

[0005] The technical solution of the present invention is as follows:

[0006] The drive unit for wet membrane extraction includes

[0007] Body

[0008] The floating rollers are arranged sequentially on the machine body. Each floating roller has a shaft cavity with an inlet and several floating holes that lead to the outside of the floating roller.

[0009] Furthermore, the floating roller includes

[0010] The outer cylinder has a buoyancy hole that is located on and extends through it.

[0011] The inner cylinder is located inside the outer cylinder, forming an annular cavity. The inlet is located on the inner cylinder, which also has a flow channel. The inlet communicates with the annular cavity through the flow channel.

[0012] The connector has a connection channel that communicates with the inlet.

[0013] Furthermore, the floating holes are distributed on the upper or lower half of the surface of the floating roller.

[0014] Furthermore, four floating rollers form a roller group, with two floating rollers on one roller shaft located at the upper part of the machine body and two floating rollers located at the lower part of the machine body;

[0015] Two adjacent floating rollers are located at the top and bottom of the machine body, respectively, and the diaphragm passes around several floating rollers in sequence.

[0016] Furthermore, the machine body has an extraction space inside, guide grooves on both sides, and a floating roller is slidably disposed within the guide grooves and located within the extraction space.

[0017] The extraction device for wet diaphragm extraction has a discharge port on one side and a feed port on the other side.

[0018] In this embodiment, an inlet and an outlet are designed on both sides of the frame for the diaphragm to enter and exit the extraction space. The design of the inlet and outlet makes it easier for operators to determine the height of the floating roller, making the length control of the diaphragm in the extraction space more precise.

[0019] Furthermore, it also includes

[0020] The discharge regulating roller is positioned on one side of the discharge port. Its lifting mechanism is used to adjust the diaphragm's position. The discharge regulating roller has the same structure as the floating roller.

[0021] Linear drive components are installed on the machine body, and there are several linear drive components used to drive the floating rollers to rise and fall. Each floating roller is driven by one linear drive component to achieve the rising and falling.

[0022] Furthermore, it also includes a liquid collection tank, which is located at the bottom of the machine body and below the extraction space. The liquid collection tank has a liquid inlet, an overflow hole, and a liquid outlet. The liquid inlet is located in the middle of the liquid collection tank, the overflow hole is located above the liquid inlet, and the liquid outlet is located below the liquid inlet.

[0023] Furthermore, it also includes a circulation pump, one end of which is connected to an outlet, and the other end of which leads to a connector. Both sides of the machine body have transverse elongated through holes. It also includes an upper membrane assembly, which is located on both sides of the machine body.

[0024] The transverse guide rail is located on the outside of the machine body.

[0025] The first sliding member is mounted on the transverse guide rail.

[0026] The membrane clamping cylinder slides along with the first sliding member. The membrane clamping cylinder has a chuck that extends into the extraction space through a transverse elongated through-hole.

[0027] The second sliding member is mounted on the first sliding member and moves closer to or further away from the transverse elongated through hole after sliding. The diaphragm cylinder is mounted on the second sliding member.

[0028] A first linear drive device drives a first slider to slide.

[0029] A second linear drive device is disposed on the first slider, and the second linear drive device drives the second slider to slide.

[0030] The wet membrane extraction method utilizes the aforementioned transmission device to extract organic matter from the membrane, and includes the following steps:

[0031] Upper membrane: Several floating rollers move up and down, forming an upper group of floating rollers and a lower group of floating rollers. A channel is formed between the upper and lower groups of floating rollers. The end of the diaphragm moves from one end of the channel to the other. The upper group of floating rollers moves down while the lower group of floating rollers moves up, spreading the diaphragm up and down and distributing it back and forth on the floating rollers.

[0032] Extraction: Extraction liquid is introduced into the shaft cavity of the floating roller. The extraction liquid seeps out or sprays out from the floating holes and forms an extraction surface on the roller surface of the floating roller. The diaphragm continues to move and comes into contact with the extraction surface to perform extraction. When the amount of diaphragm hanging on the floating roller is too much or too little, the height of the floating roller is adjusted to avoid the diaphragm from wrinkling, piling up, or being torn.

[0033] The working principle and beneficial effects of this invention are as follows:

[0034] This invention incorporates a floating roller mounted on the machine body. It is used to drive the separator during the separator extraction stage in wet-process lithium-ion battery separator production. The floating roller replaces the traditional drive roller. When the separator is driven by the floating roller, the fluid enters through the inlet and exits through the floating holes. The fluid forms a drive film on the surface of the floating roller. The separator contacts this drive film, avoiding direct contact between the separator and the roller surface. Since the drive film is composed of fluid and lacks a rigid structure, it will not scratch the separator surface, thus preventing scratches caused by contact with the drive roller. This also avoids breakage caused by diaphragm scratches. Compared to the existing wet diaphragm production extraction transmission technology, the transmission membrane surface generated by the floating roller transmission has tension, which ensures that if the diaphragm has slight wrinkles when passing through the transmission membrane, the tension on the transmission membrane surface can stretch the diaphragm, preventing the wrinkles from being pressed tight by the tension generated by the transmission device. If wrinkles do occur, the tension on the transmission membrane surface can gradually stretch the diaphragm, avoiding the large-scale scrapping of diaphragms caused by large wrinkles at the beginning of the diaphragm production process and failure to detect them in time. Compared with the transmission device of the existing technology, the quality of the produced diaphragms is higher. Attached Figure Description

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0036] Figure 1 This is a schematic diagram of the structure of the present invention;

[0037] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0038] Figure 3 for Figure 2 Schematic diagram of the AA section structure;

[0039] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of the middle BB;

[0040] Figure 5 This is a schematic diagram of the floating roller structure;

[0041] Figure 6 This is a structural schematic diagram of the floating roller from another perspective.

[0042] In the diagram: Body-1, Floating Roller-2, Shaft Cavity-201, Inlet-202, Floating Hole-203, Outer Cylinder-204, Inner Cylinder-205, Annular Cavity-206, Flow Channel-207, Connector-208, Connection Channel-209, Extraction Space-101, Guide Groove-102, Discharge Port-3, Inlet Port-4, Discharge Adjustment Roller-5, Linear Drive Component-6, Liquid Collection Tank-7, Liquid Inlet Hole-701, Overflow Hole-702, Liquid Outlet Hole-703, Horizontal Long Through Hole-103, Upper Membrane Assembly-8, Horizontal Guide Rail-801, First Sliding Component-802, Membrane Clamping Cylinder-803, Clamp-804, Second Sliding Component-805, First Linear Drive Device-806, Second Linear Drive Device-807, Channel-9. Detailed Implementation

[0043] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0044] like Figures 1-6 As shown, this embodiment proposes a transmission device for wet membrane extraction, including a body 1 and a floating roller 2. The floating roller 2 is disposed on the body 1 and is arranged in sequence. The floating roller 2 has a shaft cavity 201, the shaft cavity 201 has an inlet 202 and a plurality of floating holes 203, and the floating holes 203 lead to the outside of the floating roller 2.

[0045] This embodiment incorporates a floating roller 2, mounted on the machine body 1. It is used to drive the separator during the separator extraction stage in wet-process lithium-ion battery separator production. The floating roller 2 replaces the existing drive roller. When the floating roller 2 drives the separator, the driving fluid enters through inlet 202 and exits through the floating hole 203. The fluid forms a driving film on the surface of the floating roller 2. The separator contacts this driving film, avoiding direct contact between the separator and the roller body surface. Since the driving film is composed of fluid and lacks a rigid structure, it will not scratch the separator surface, thus preventing damage caused by contact with the drive roller. The membrane scratches are also prevented from causing breakage. Compared to the existing wet membrane extraction transmission technology, the transmission membrane surface generated by the floating roller 2 has tension, which ensures that if the membrane has slight wrinkles when passing through the transmission membrane, the tension on the transmission membrane surface can stretch the membrane, preventing the wrinkles from being pressed tight by the tension generated by the transmission device. If wrinkles do occur, the tension on the transmission membrane surface can gradually stretch the membrane, avoiding the large-scale scrapping of membranes caused by large wrinkles at the beginning of the membrane production process and failure to be detected in time. Compared with the transmission device of the existing technology, the quality of the produced membrane is higher.

[0046] Furthermore, the floating roller 2 includes an outer cylinder 204, a floating hole 203 disposed on and penetrating the outer cylinder 204, an inner cylinder 205 disposed inside the outer cylinder 204, the inner cylinder 205 and the outer cylinder 204 forming an annular cavity 206, an inlet 202 disposed on the inner cylinder 205, the inner cylinder 205 also having a flow channel 207, the inlet 202 communicating with the annular cavity 206 through the flow channel 207, and a connector 208 having a connecting channel 209 communicating with the inlet 202.

[0047] In this embodiment, the floating roller 2 consists of three parts: an outer cylinder 204, an inner cylinder 205, and a connector 208. The connector 208 is designed as a universal connector 208, which is used to communicate with the inner cylinder 205 and to allow fluid to enter the floating roller 2. Compared with a regular connector 208, the connection is quicker. The inner cylinder 205 has several evenly distributed flow channels 207. The fluid entering the inner cylinder flows out through the flow channels 207, ensuring the uniform distribution of fluid in the annular cavity 206. This prevents fluid from flowing out through the floating holes 203 when the fluid in the annular cavity 206 is not evenly distributed. It ensures that the pressure and flow rate of the fluid flowing out of the floating holes 203 on the same floating shaft are the same, avoiding diaphragm wrinkles caused by different fluid pressures and flow rates.

[0048] Furthermore, the floating holes 203 are distributed on the upper or lower half of the surface of the floating roller 2. In this embodiment, considering that the maximum contact angle between the diaphragm and the floating roller 2 is 180° during the diaphragm transmission process, in order to reduce fluid consumption, increase fluid pressure, and better protect the diaphragm from being scratched by the floating roller 2, the floating holes 203 are distributed on the upper or lower half of the surface of the floating roller 2.

[0049] Furthermore, four floating rollers 2 form a roller group, with two floating rollers 2 on the upper part of the machine body 1 and two floating rollers 2 on the lower part of the machine body 1. Two adjacent floating rollers 2 are located at the upper and lower parts of the machine body 1, respectively, and the diaphragm passes over several floating rollers 2 sequentially. In this embodiment, to ensure better transmission of the diaphragm, four floating rollers 2 are configured as a roller group, and several roller groups form a transmission device. Two adjacent floating rollers 2 are designed to be located at the upper and lower parts of the machine body 1, respectively. The diaphragm passes over several floating rollers 2 sequentially, and the diaphragm contacts the transmission membrane formed by the fluid on the surface of the floating rollers 2. The surface tension of the fluid exerts an upward or downward thrust on the diaphragm, and a collecting device located outside the machine body 1 generates a pulling force on the diaphragm. Through the combination of pulling and thrust, the diaphragm is tightly attached to the transmission membrane, achieving diaphragm transmission. The structure is simple, the equipment failure rate is low, and the membrane-passing method of the diaphragm sequentially passing over the floating rollers 2 can effectively improve the extraction effect.

[0050] Furthermore, the machine body 1 has an extraction space 101 inside, and guide grooves 102 on both sides. The floating roller 2 is slidably disposed in the guide grooves 102 and located within the extraction space 101. In this embodiment, considering that the extraction liquid used in existing extraction diaphragm production equipment based on wet diaphragm production can be reused, and the extraction process is carried out within the extraction space 101 to facilitate the recovery of the extraction liquid, the machine body 1 is also designed with guide grooves 102. The floating roller 2 is slidably disposed in the guide grooves 102. When extracting diaphragms of different specifications, the extraction time can be adjusted by adjusting the distance between two adjacent floating rollers 2, making the equipment more versatile. When adjusting the production cycle, the extraction time can be adjusted by adjusting the distance between two adjacent floating rollers 2 to ensure better extraction results.

[0051] The wet diaphragm extraction apparatus includes a machine body 1 with a discharge port 3 on one side and a feed port 4 on the other side. In this embodiment, the feed port 4 and the discharge port 3 are designed on both sides of the frame for the diaphragm to enter and exit the extraction space 101. The design of the feed port 4 and the discharge port 3 makes it easier for the operator to determine the height of the floating roller 2, making the length control of the diaphragm within the extraction space 101 more precise.

[0052] Furthermore, it also includes a discharge regulating roller 5, which is raised and lowered on one side of the discharge port 3. After the discharge regulating roller 5 is raised and lowered, it is used to realize the diaphragm raising and lowering. The discharge regulating roller 5 has the same structure as the floating roller 2. There are several linear drive components 6 on the machine body 1, which are used to drive the floating roller 2 to rise and fall. Each floating roller 2 is driven by one linear drive component 6 to achieve the raising and lowering.

[0053] In this embodiment, a discharge adjustment roller 5 is designed to tighten or loosen the diaphragm when the transmission speed changes due to equipment failure, thus preventing the diaphragm from wrinkling or breaking due to changes in the transmission speed and effectively reducing losses caused by equipment failure. A linear drive component 6 is also designed to drive the lifting and lowering of the floating roller 2. The linear drive component 6 corresponds one-to-one with the floating roller 2, enabling operators to accurately control the position of the floating roller 2. Through precise control of the floating roller 2, the quality of the product can be effectively improved.

[0054] Furthermore, it also includes a liquid collection tank 7, which is located at the bottom of the body 1 and below the extraction space 101. The liquid collection tank 7 has a liquid inlet 701, an overflow hole 702 and a liquid outlet 703. The liquid inlet 701 is located in the middle of the liquid collection tank 7, the overflow hole 702 is located above the liquid inlet 701 and the liquid outlet 703 is located below the liquid inlet 701.

[0055] In this embodiment, a collection tank 7 is designed to collect the extracted liquid. The collection tank 7 is provided with an inlet hole 701, an overflow hole 702, and an outlet hole 703. When the extract is used as a fluid, the outlet hole 703 leads to the extraction space 101 and pumps pressurized extract into the connector 208. The inlet hole 701 is used to pump new extract into the collection tank 7. After the extract has been used for a period of time, the extract in the extraction tank will separate into layers. At this time, new extract is pumped into the collection tank 7 through the inlet hole 701. The upper layer of extract containing more impurities flows out through the overflow hole 702. This structure reduces the amount of extract used, thereby reducing the difficulty of extract recovery and the cost of use.

[0056] Furthermore, it also includes a circulation pump, one end of which is connected to the liquid outlet 703, and the other end of which leads to the connector 208. Both sides of the machine body 1 have transverse elongated through holes 103. It also includes an upper membrane assembly 8, which is disposed on both sides of the machine body 1. The upper membrane assembly 8 includes a transverse guide rail 801, which is disposed on the outside of the machine body 1. The first sliding member 802 is disposed on the transverse guide rail 801. The membrane clamping cylinder 803 slides with the first sliding member 802. The membrane clamping cylinder 803 has a clamp 804, which extends through the transverse elongated through holes 103 into the extraction space 101.

[0057] In this embodiment, a circulation pump is designed to circulate the extractant from the collection tank 7 to the floating roller 2. The circulation pump has low cost, strong equipment versatility, and is easy to maintain. Considering that existing extraction transmission devices require operators to perform membrane insertion operations first, and that harmful gases inside the extraction equipment can cause significant harm to the human body, a transverse elongated through-hole 103, a transverse guide rail 801, a first sliding member 802, and a membrane clamping cylinder 803 are designed to facilitate membrane insertion within the extraction device. During membrane insertion, the floating roller 2 moves along the guide groove 102 toward the floating hole 203. On the other side, the floating rollers 2 slide to form a membrane-passing space. After the membrane-clamping cylinder 803 on the first sliding member 802 moves to the feed port 4, the clamp 804 clamps the diaphragm. The first sliding member 802 slides along the transverse guide rail 801 to the discharge port 3. After the first sliding member 802 reaches the discharge port 3, the floating rollers 2 move along the guide groove 102 toward the direction of the floating hole 203 to press and support the diaphragm. This feeding method is simple to operate, reduces the labor intensity of operators, and reduces the harm to the human body caused by the toxic environment caused by the volatilization of extract during membrane-passing.

[0058] Furthermore, a second sliding member 805 is provided on the first sliding member 802, and after sliding, it approaches or moves away from the transverse elongated through hole 103. A membrane clamping cylinder 803 is provided on the second sliding member 805. A first linear drive device 806 drives the first sliding member 802 to slide. A second linear drive device 807 is provided on the first sliding member 802 and drives the second sliding member 805 to slide.

[0059] In this embodiment, a first linear drive device 806 is designed to drive the sliding of the first sliding member 802, and a second linear drive device 807 is designed to drive the sliding of the second sliding member 805. When the second sliding member 805 approaches the transverse elongated through hole 103, the chuck 804 enters the extraction space 101 to facilitate clamping the diaphragm. When the second sliding member 805 moves away from the transverse elongated through hole 103, the chuck 804 moves out of the extraction space 101 to avoid the clamping cylinder scratching the diaphragm.

[0060] This embodiment also proposes a wet membrane extraction method, including the following steps.

[0061] Upper membrane: Several floating rollers 2 move up and down to form an upper group of floating rollers and a lower group of floating rollers. A channel 9 is formed between the upper group of floating rollers and the lower group of floating rollers. The end of the diaphragm moves from one end of the channel 9 to the other end. The upper group of floating rollers moves down and the lower group of floating rollers moves up, spreading the diaphragm up and down and distributing it on the floating rollers 2.

[0062] Extraction: Extraction liquid is introduced into the shaft cavity 201 of the floating roller 2. The extraction liquid seeps out or sprays out from the floating hole 203 and forms an extraction surface on the roller surface of the floating roller 2. The diaphragm continues to move and comes into contact with the extraction surface to perform extraction. When the amount of diaphragm hanging on the floating roller 2 is too much or too little, the height of the floating roller 2 is adjusted to avoid the diaphragm from wrinkling, piling up, or being torn.

[0063] In this embodiment, the channel 9 is formed by moving the floating roller 2. Compared with the existing technology of feeding film and sheet materials through roller drive, this method avoids manual film threading, improves the safety of film feeding on the equipment, and reduces the possibility of safety accidents. The movement of the floating roller 2 enables the membrane to be stretched and reciprocated. Compared with direct tensioning by motor, this method causes less damage to the membrane and reduces the possibility of membrane breakage. Compared with the existing film feeding method, the labor intensity of operators is lower, the film feeding is faster, and it is conducive to the rapid recovery of production after equipment failure.

[0064] In this embodiment, by introducing the extractant into the shaft cavity 201 of the floating roller 2, the extractant seeps out or sprays out from the floating hole 203. The angle of the extraction surface formed by the extractant is greater than the maximum contact angle between the diaphragm and the floating roller 2, ensuring that the diaphragm will not be scratched by the surface of the floating roller 2. The extraction surface is formed by the extractant, and the surface of the extractant has tension. By tightening the diaphragm located in the extraction space 101 through the diaphragm outside the discharge port 3, the surface tension of the extractant is broken, and the extraction of organic matter on the surface of the diaphragm is realized. Compared with the shower extraction of the prior art, this embodiment avoids the effects of the drive roller on the film such as scratches and wrinkles. Compared with the immersion extraction of the prior art, this embodiment can not only avoid the problem of the drive shaft causing scratches and wrinkles to the film, but also reduce the consumption of extractant, reduce the capital occupation caused by extractant, and reduce the pressure of treating extraction waste liquid.

[0065] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A transmission device for wet membrane extraction, characterized in that, include Body (1), A floating roller (2) is provided on the machine body (1) and there are several of them arranged in sequence. The floating roller (2) has a shaft cavity (201). The shaft cavity (201) has an inlet (202) and several floating holes (203). The floating holes (203) lead to the outside of the floating roller (2). The floating holes (203) are distributed on the upper half or lower half of the surface of the floating roller (2). The connector (208) has a connection channel (209) that communicates with the inlet (202).

2. The transmission device for wet membrane extraction according to claim 1, characterized in that, The floating roller (2) includes The outer cylinder (204) has a floating hole (203) disposed on the outer cylinder (204) and penetrating the outer cylinder (204). The inner cylinder (205) is disposed inside the outer cylinder (204), and the inner cylinder (205) and the outer cylinder (204) form an annular cavity (206). The inlet (202) is disposed on the inner cylinder (205), and the inner cylinder (205) also has a flow channel (207). The inlet (202) is connected to the annular cavity (206) through the flow channel (207).

3. The transmission device for wet membrane extraction according to claim 1, characterized in that, The four floating rollers (2) form a roller group, with two of the floating rollers (2) in one roller shaft located on the upper part of the machine body (1) and two of the floating rollers (2) located on the lower part of the machine body (1); The two adjacent floating rollers (2) are located at the upper and lower parts of the body (1), respectively, and the diaphragm passes around several floating rollers (2) in sequence.

4. The transmission device for wet membrane extraction according to claim 1, characterized in that, The machine body (1) has an extraction space (101) inside and guide grooves (102) on both sides. The floating roller (2) is slidably disposed in the guide grooves (102) and located in the extraction space (101).

5. An extraction apparatus for wet diaphragm extraction, utilizing the transmission device for wet diaphragm extraction as described in any one of claims 1 to 4, characterized in that, The machine body (1) has a discharge port (3) on one side and a feed port (4) on the other side. The machine frame is designed with a feed inlet (4) and a discharge outlet (3) on both sides for the diaphragm to enter and exit the extraction space (101). The design of the feed inlet (4) and the discharge outlet (3) makes it easier for the operator to determine the height of the floating roller (2) and make the length control of the diaphragm in the extraction space (101) more precise.

6. The extraction apparatus for wet membrane extraction according to claim 5, characterized in that, Also includes The discharge regulating roller (5) is raised and lowered on one side of the discharge port (3). After being raised and lowered, the discharge regulating roller (5) is used to realize the raising and lowering of the diaphragm. The discharge regulating roller (5) has the same structure as the floating roller (2). Linear drive (6), which is disposed on the machine body (1), consists of several units, and is used to drive the floating roller (2) to rise and fall. Each floating roller (2) is driven by one linear drive (6) to achieve the rising and falling.

7. The extraction apparatus for wet membrane extraction according to claim 5, characterized in that, It also includes a liquid collection tank (7), which is located at the bottom of the body (1) and below the extraction space (101). The liquid collection tank (7) has an inlet hole (701), an overflow hole (702) and an outlet hole (703). The inlet hole (701) is located in the middle of the liquid collection tank (7), the overflow hole (702) is located above the inlet hole (701), and the outlet hole (703) is located below the inlet hole (701).

8. The extraction apparatus for wet membrane extraction according to claim 7, characterized in that, It also includes a circulation pump, one end of which is connected to the outlet (703), and the other end of which leads to the connector (208). The body (1) has transverse elongated through holes (103) on both sides. It also includes an upper membrane assembly (8), which is disposed on both sides of the body (1). A transverse guide rail (801) is provided on the outside of the body (1). The first sliding member (802) is disposed on the transverse guide rail (801). A membrane clamping cylinder (803) slides along with the first sliding member (802). The membrane clamping cylinder (803) has a chuck (804) that extends through the transverse elongated through hole (103) into the extraction space (101). The second sliding member (805) is disposed on the first sliding member (802) and moves closer to or further away from the transverse elongated through hole (103) after sliding. The membrane clamping cylinder (803) is disposed on the second sliding member (805). A first linear drive device (806) drives the first slider (802) to slide. A second linear drive device (807) is disposed on the first slider (802), and the second linear drive device (807) drives the second slider (805) to slide.

9. A wet membrane extraction method, characterized in that, The extraction of organic matter on a diaphragm using the transmission device of wet diaphragm extraction according to any one of claims 1 to 4 includes the following steps: Upper membrane: Several floating rollers (2) move up and down to form an upper group of floating rollers and a lower group of floating rollers, forming a channel (9) between the upper group of floating rollers and the lower group of floating rollers. The end of the diaphragm moves from one end of the channel (9) to the other end. The upper group of floating rollers moves down and the lower group of floating rollers moves up, spreading the diaphragm up and down and distributing it on the floating rollers (2). Extraction: Extraction liquid is introduced into the shaft cavity (201) of the floating roller (2). The extraction liquid seeps out or sprays out from the floating hole (203) and forms an extraction surface on the roller surface of the floating roller (2). The diaphragm continues to move and contacts the extraction surface to perform extraction. When the amount of the diaphragm hanging on the floating roller (2) is too much or too little, the height of the floating roller (2) is adjusted to avoid the diaphragm from wrinkling, piling up, or being torn.

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