Diaphragm water removal device

Abstract

The utility model provides a diaphragm water removal device. The diaphragm water removal device comprises a rack, a water squeezing assembly and a water absorption assembly. The water squeezing assembly comprises a water squeezing pressing roller piece and a rotating roller piece, the water squeezing pressing roller piece and the rotating roller piece are arranged on the rack side by side, and the water squeezing pressing roller piece is pressed and attached to the rotating roller piece; the water absorption assembly comprises an upper water absorption roller piece and a lower water absorption roller piece; the rotating roller piece, the upper water absorption roller piece and the lower water absorption roller piece are sequentially arranged on the rack in parallel in the moving direction of the diaphragm; after the diaphragm penetrates through the space between the water squeezing roller piece and the rotating roller piece to squeeze water, the front face and the back face of the diaphragm sequentially pass through the upper water absorption roller piece and the lower water absorption roller piece to be subjected to secondary water absorption. Primary water removal is carried out through extrusion of the water extrusion pressing roller piece and the rotating roller piece, then water on the front face and the back face of the diaphragm is adsorbed through the upper water absorption roller piece and the lower water absorption roller piece, water removal is carried out through the pressing roller water extrusion mode and the water absorption roller water absorption mode, most of water on the diaphragm can be effectively removed, the water removal effect is improved, and the service life of the diaphragm is prolonged. The ionic conduction performance of the diaphragm is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, in particular to a diaphragm water removal device. Background Art

[0002] The separator is an important component of lithium batteries. It is used to isolate the positive and negative electrodes of the battery and prevent electrons from passing through, while allowing ions to pass through, so that lithium ions can be transferred between the positive and negative electrodes during the charging and discharging process of the battery.

[0003] In order to increase the thermal stability of the diaphragm and improve the wettability of the diaphragm to the electrolyte, a special coating needs to be applied on the base membrane. After the base membrane is coated, it needs to go through a water tank extraction step. After the water tank extraction, a large amount of water will be attached to the surface of the diaphragm. After drying in a drying oven, water stains will form on the surface of the diaphragm, affecting the ion conductivity of the diaphragm, resulting in obstruction of the flow of electrolytes inside the battery, reducing the discharge capacity and charging speed of the battery, thereby affecting the performance of the battery. Nowadays, the commonly used method for removing water stains is to squeeze water with a roller or use an air knife to blow the water off, but the above-mentioned water stain removal method is not effective, and a large amount of water stains still remain on the surface of the diaphragm, seriously affecting the ion conductivity of the diaphragm. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present application provides a diaphragm water removal device.

[0005] The present application discloses a membrane water removal device comprising: a frame, a water squeezing component and a water absorbing component; the water squeezing component comprises a water squeezing pressure roller and a rotating roller, the water squeezing pressure roller and the rotating roller are arranged side by side on the frame, and the water squeezing pressure roller is pressed against the rotating roller; the water absorbing component comprises an upper water absorbing roller and a lower water absorbing roller; along the moving direction of the membrane, the rotating roller, the upper water absorbing roller and the lower water absorbing roller are sequentially arranged in parallel on the frame; after the membrane passes through the space between the water squeezing pressure roller and the rotating roller to squeeze water, the front and back sides of the membrane successively pass through the upper water absorbing roller and the lower water absorbing roller for secondary water absorption.

[0006] Preferably, the water squeezing roller member includes a water squeezing roller and a pressing drive unit, the pressing drive unit is arranged on the frame, the driving end of the pressing drive unit is connected to the water squeezing roller, and drives the water squeezing roller to maintain a state of pressing against the rotating roller member.

[0007] Preferably, the clamping drive part includes two clamping drives, two guide parts and two sliding parts. The two guide parts are respectively arranged on the frame, and the two sliding parts are respectively slidably arranged on the two guide parts. The driving ends of the two clamping drives are respectively connected to the two sliding parts, and the two ends of the water squeezing pressure roller are respectively rotatably arranged on the two sliding parts. The clamping drive drives the sliding part to drive the water squeezing pressure roller to press against the rotating roller and maintain the pressing state.

[0008] Preferably, the upper suction roller member is located directly below the lower suction roller member.

[0009] Preferably, the upper water-absorbing roller member comprises an upper water-absorbing roller and a water-absorbing layer, and the water-absorbing layer is coated on the outer side of the upper water-absorbing roller.

[0010] Preferably, the upper water suction roller also includes a vacuum part, a hollow pipe is opened in the upper water suction roller, and the vacuum end of the vacuum part is arranged in the hollow pipe; a plurality of through holes are evenly distributed on the surface of the upper water suction roller, and the through holes are connected with the hollow pipe.

[0011] Preferably, the upper water-absorbing roller further comprises a cleaning portion, and the cleaning portion is communicated with the hollow pipe.

[0012] Preferably, the upper water-absorbing roller also includes a rotation driving part, which is arranged on the frame, and a driving end of the rotation driving part is connected to the upper water-absorbing roller to drive the upper water-absorbing roller to rotate.

[0013] Preferably, the rotating roller, the upper water suction roller and the lower water suction roller are rotatably arranged on the frame respectively, and the rotating speed of the rotating roller, the upper water suction roller and the lower water suction roller is equal to the moving speed of the diaphragm.

[0014] Preferably, the axial lengths of the rotating roller, the upper suction roller and the lower suction roller are equal.

[0015] The beneficial effect of the present application is that the first water removal is carried out by squeezing the water-squeezing pressure roller and the rotating roller, and then the water on the front and back sides of the diaphragm is adsorbed by the upper water-absorbing roller and the lower water-absorbing roller respectively. In this way, water is removed by the dual methods of squeezing water by the pressure roller and absorbing water by the water-absorbing roller, which can effectively remove most of the water on the diaphragm, improve the water removal effect, improve the ion conductivity of the diaphragm, thereby improving the discharge capacity and charging speed of the battery, and improving the performance of the battery.

[0016] At the same time, the setting of the clamping driver can maintain the close contact between the squeezing roller and the rotating roller, improving the squeezing and dewatering effect. The setting of the vacuum part makes the upper and lower water-absorbing rollers have vacuum suction, improving the adsorption and dewatering effect. The setting of the cleaning part can self-clean the water-absorbing roller, remove the foreign matter on its surface and inside to prevent clogging, and maintain a strong dewatering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 It is a structural schematic diagram of the membrane water removal device in the embodiment;

[0019] Figure 2 Schematic diagram of the membrane water removal process in the embodiment.

[0020] Reference numerals:

[0021] 1. Frame; 2. Water squeezing assembly; 21. Water squeezing pressure roller; 211. Water squeezing pressure roller; 212. Compressing drive unit; 2121. Compressing driver; 2122. Guide unit; 2123. Sliding unit; 22. Rotating roller; 3. Water absorbing assembly; 31. Upper water absorbing roller; 311. Upper water absorbing roller; 3111. Through hole; 312. Rotating drive unit; 313. Vacuum unit; 314. Cleaning unit; 32. Lower water absorbing roller. DETAILED DESCRIPTION

[0022] The following will disclose multiple embodiments of the present application with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present application. In other words, in some embodiments of the present application, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0023] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0024] In addition, in the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present application. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0025] In order to further understand the application content, features and effects of the present application, the following embodiments are cited and described in detail with reference to the accompanying drawings.

[0026] Reference Figure 1-2 , Figure 1 It is a structural schematic diagram of the diaphragm water removal device in the embodiment, Figure 2Schematic diagram of the membrane dewatering process in the embodiment. The membrane dewatering device in this embodiment includes a frame 1, a water squeezing assembly 2 and a water absorbing assembly 3. The water squeezing assembly 2 includes a water squeezing pressure roller 21 and a rotating roller 22. The water squeezing pressure roller 21 and the rotating roller 22 are arranged side by side on the frame 1, and the water squeezing pressure roller 21 is pressed against the rotating roller 22. The water absorbing assembly 3 includes an upper water absorbing roller 31 and a lower water absorbing roller 32. Along the moving direction of the membrane, the rotating roller 22, the upper water absorbing roller 31 and the lower water absorbing roller 32 are arranged in parallel on the frame 1 in sequence. After the membrane passes through the squeezing pressure roller 21 and the rotating roller 22 to squeeze water, the front and back sides of the membrane pass through the upper water absorbing roller 31 and the lower water absorbing roller 32 in turn for secondary water absorption.

[0027] The membrane dehydration device in this embodiment is used to dehydrate the lithium battery membrane. It first removes water by squeezing the water-squeezing roller 21 and the rotating roller 22, and then absorbs the water on the front and back sides of the membrane by the upper water-absorbing roller 31 and the lower water-absorbing roller 32. In this way, the water is removed by the double methods of squeezing water by the pressure roller and absorbing water by the water-absorbing roller, which can effectively remove most of the water on the membrane, improve the dehydration effect, improve the ion conductivity of the membrane, thereby improving the discharge capacity and charging speed of the battery, and improving the performance of the battery. At the same time, the small amount of water remaining on the membrane can be easily dried after the membrane enters the oven for drying, which reduces the temperature of the oven during subsequent oven drying and reduces the drying time, effectively reducing energy consumption and saving electricity costs. Specifically, the frame 1 in this embodiment is placed on the floor of the factory building, and includes a first frame and a second frame. The first frame and the second frame are arranged opposite to each other, and the two ends of the water squeezing pressure roller 21, the two ends of the rotating roller 22, the two ends of the upper water absorption roller 31 and the two ends of the lower water absorption roller 32 are respectively arranged on the first frame and the second frame. The water squeezing pressure roller 21, the rotating roller 22, the upper water absorption roller 31 and the lower water absorption roller 32 are parallel to each other, and the water squeezing pressure roller 21 and the rotating roller 22 are arranged parallel to each other. The diaphragm passes through the water squeezing pressure roller 21 and the rotating roller 22, the upper water absorption roller 31 and the lower water absorption roller 32 in sequence, so that the moving direction of the diaphragm described in this embodiment is also the running direction of the diaphragm.

[0028] Re-reference Figure 1-2Preferably, the squeezing roller member 21 includes a squeezing roller 211 and a pressing driving unit 212. The pressing driving unit 212 is disposed on the frame 1. The driving end of the pressing driving unit 212 is connected to the squeezing roller 211 to drive the squeezing roller 211 to maintain a state of pressing against the rotating roller member 22. By setting the pressing driving unit 212, the squeezing roller 211 and the rotating roller member 22 are always kept in a state of close contact. When the diaphragm passes between the squeezing roller 211 and the rotating roller member 22, the close contact between the squeezing roller 211 and the rotating roller member 22 can block most of the water on the diaphragm, realize the first squeezing and dewatering, and improve the dewatering effect. At the same time, since the surface of the squeezing roller 211 is made of rubber, long-term use will cause its surface to be squeezed and deformed, resulting in the roller diameter being squeezed smaller, and the pressing drive unit 212 can drive the squeezing roller 211 to keep in contact with the rotating roller 22 at all times, avoiding the situation where the squeezing water removal effect is reduced due to loose pressing, improving the stability of the water removal effect, and removing 65% of the water on the diaphragm surface by squeezing water removal. Specifically, the rotating roller 22 is a steel roller, which is driven to rotate by an internal motor belt. It should be noted that the rotating roller 22 is an active roller, and the squeezing roller 211 is a passive roller. The squeezing roller 211 is pressed on the steel roller and driven by the steel roller to rotate.

[0029] Re-reference Figure 1-2 Preferably, the pressing drive unit 212 includes two pressing drives 2121, two guides 2122 and two sliding parts 2123. The two guides 2122 are respectively arranged on the frame 1, and the two sliding parts 2123 are respectively slidably arranged on the two guides 2122. The driving ends of the two pressing drives 2121 are respectively connected to the two sliding parts 2123. The two ends of the squeezing roller 211 are respectively rotatably arranged on the two sliding parts 2123. The pressing drive 2121 drives the sliding parts 2123 to drive the squeezing roller 211 to press against the rotating roller 22 and maintain the pressing state. Through the setting of the guide 2122, the movement of the two pressing drives 2121 is respectively guided to ensure that the squeezing roller 211 can always maintain a parallel state with the rotating roller 22 when pressing the rotating roller 22, thereby improving the squeezing and dewatering effect, and at the same time avoiding the wrinkling phenomenon when the diaphragm passes through due to the non-parallelism between the squeezing roller 211 and the rotating roller 22. Specifically, the clamping driver 2121 in this embodiment is a clamping cylinder, and the pressure of the squeezing roller 211 on the rotating roller 22 is adjusted by adjusting the air pressure of the clamping cylinder, that is, the pressure of the squeezing roller 211 and the rotating roller 22 on the diaphragm is adjusted to a suitable state to prevent the pressure from being too low to achieve the water removal effect, or too high to damage the coating of the diaphragm. The guide part 2122 is a guide frame, and the sliding part 2123 is a sliding block.

[0030] Re-reference Figure 1-2Preferably, the upper water-absorbing roller component 31 includes an upper water-absorbing roller 311 and a water-absorbing layer, and the water-absorbing layer is coated on the outer surface of the upper water-absorbing roller 311. In specific applications, the water-absorbing layer is cotton cloth, and when the diaphragm passes over the upper water-absorbing roller 311, the water-absorbing layer can effectively absorb the water on the diaphragm. Specifically, the lower water-absorbing roller component 32 has a similar structure to the upper water-absorbing roller component 31, including a lower water-absorbing roller and a water-absorbing layer, and the water-absorbing layer is coated on the outer surface of the lower water-absorbing roller. Furthermore, the upper water-absorbing roller component 31 is located directly below the lower water-absorbing roller component 32. After the membrane is squeezed and dehydrated by the squeezing roller 211 on the rotating roller 22, it first moves from above the upper water-absorbing roller 311. The cotton cloth on the surface of the upper water-absorbing roller 311 absorbs the water on the front side of the membrane. Then the membrane moves from below the lower water-absorbing roller, that is, an "S"-shaped moving direction is formed at the upper water-absorbing roller 311 and the lower water-absorbing roller. The cotton cloth on the surface of the lower water-absorbing roller absorbs the water on the back side of the membrane, thus ensuring that both sides of the front side of the membrane are dehydrated by adsorption, thereby improving the dehydration effect. At the same time, the upper water-absorbing roller 31 is located directly below the lower water-absorbing roller 32, which also increases the contact area between the membrane and the cotton cloth, further improving the dehydration effect.

[0031] Re-reference Figure 1-2 Preferably, the upper water-absorbing roller 31 further comprises a vacuum part 313, a hollow pipe is provided in the upper water-absorbing roller 311, and the vacuum end of the vacuum part 313 is arranged in the hollow pipe. The surface of the upper water-absorbing roller 311 is evenly distributed with a plurality of through holes 3111, and the through holes 3111 are connected to the hollow pipe. In specific application, when the diaphragm passes through the surface of the upper water-absorbing roller 311, the vacuum part 313 is opened, and the hollow pipe is evacuated, so that there is suction in the hollow pipe, so that the residual water on the diaphragm is sucked toward the direction of the hollow pipe, that is, it is better adsorbed on the cotton cloth, thereby improving the water absorption effect of the upper water-absorbing roller 31, thereby improving the final water removal effect. It should be particularly noted that the vacuum part 313 of this embodiment comprises a vacuum generator, a vacuum pipe and a vacuum valve, the two ends of the vacuum pipe are connected to the vacuum generator and the hollow pipe respectively, and the vacuum valve is arranged in the vacuum pipe. By changing the size of the vacuum valve switch, the suction of the upper water-absorbing roller 311 can be effectively adjusted. Specifically, the lower water suction roller 32 also includes a vacuum portion 313, and its specific structure is similar to that of the upper water suction roller 31, which will not be repeated here. After the upper water suction roller 311 and the lower water suction roller adsorb and remove water, 95% of the water on the surface of the diaphragm can be effectively removed.

[0032] Re-reference Figure 1-2Preferably, the upper water-absorbing roller 31 also includes a cleaning part 314, and the cleaning part 314 is connected to the hollow pipe. In specific application, the cleaning part 314 includes a water supply device, a water inlet pipe and a water inlet valve, and the two ends of the water inlet pipe are respectively connected to the water supply device and the hollow pipe, and the water inlet valve is arranged in the water inlet pipe. Since the adsorbed water contains foreign matter such as impurities, when the upper water-absorbing roller 311 is used for a long time, a large amount of foreign matter will be produced and left, which will cause the through hole 3111 or the hollow pipe to be blocked. At this time, the vacuum valve is turned off and the water inlet valve is opened at the same time, and the water from the water supply device can flow into the hollow pipe through the water inlet pipe to achieve the effect of washing the residual foreign matter inside the upper water-absorbing roller 311, and prevent the suction force from being reduced due to the blockage of the through hole 3111, thereby reducing the effect of adsorbing and removing water stains. In this way, the time of workers to clean the upper water-absorbing roller 311 is saved, the time cost is saved, and the production efficiency is improved. Specifically, the lower water-absorbing roller 32 also includes a cleaning part 314, and its specific structure is similar to that of the upper water-absorbing roller 31, which will not be repeated here.

[0033] Re-reference Figure 1-2 Preferably, the upper water-absorbing roller 31 also includes a rotation driving unit 312, which is arranged on the frame 1, and the driving end of the rotation driving unit 312 is connected to the upper water-absorbing roller 311 to drive the upper water-absorbing roller 311 to rotate. In specific applications, when the diaphragm passes through the surface of the upper water-absorbing roller 311, the rotation driving unit 312 drives the upper water-absorbing roller 311 to rotate synchronously. It should be particularly noted that the tape running speed of the diaphragm matches the rotation speed of the upper water-absorbing roller 311, that is, the linear speed of the diaphragm tape running is equal to the linear speed of the upper water-absorbing roller 311. In this way, the diaphragm can always be in close contact with the surface of the upper water-absorbing roller 311, avoiding the situation that the diaphragm is wrinkled due to the slow rotation speed of the upper water-absorbing roller 311, and avoiding the situation that the diaphragm is stretched and damaged due to the fast rotation speed of the upper water-absorbing roller 311, thereby improving the dewatering effect of the diaphragm and improving the product quality. Specifically, the rotation driving unit 312 is a motor. The lower suction roller 32 also includes a rotation driving portion 312 .

[0034] Re-reference Figure 1-2Preferably, the rotating roller 22, the upper water-absorbing roller 311 and the lower water-absorbing roller 32 are respectively rotatably arranged on the frame 1, and the rotating speed of the rotating roller 22, the upper water-absorbing roller 311 and the lower water-absorbing roller 32 is equal to the moving speed of the diaphragm. In specific applications, the rotational linear speeds of the upper water-absorbing roller 311, the lower water-absorbing roller and the steel roller are equal, and are also equal to the moving linear speed of the diaphragm, and the steel roller, the squeezing roller 211, the upper water-absorbing roller 311 and the lower water-absorbing roller are parallel to each other, that is, the four are parallel to each other, so as to ensure that the diaphragm can always keep moving at a uniform speed during the dewatering process, that is, during the belt running process, when the diaphragm passes through the surface of the steel roller, the upper water-absorbing roller 311 and the lower water-absorbing roller, its belt running speed does not change, so as to avoid the situation that the diaphragm is stretched and damaged due to the roller speed being greater than the belt running speed, and also avoid the situation that the diaphragm is wrinkled due to the roller speed being less than the belt running speed. Furthermore, the axial lengths of the rotating roller 22, the upper suction roller 311 and the lower suction roller 32 are equal. Specifically, the axial lengths of the steel roller, the squeezing roller 211, the upper suction roller 311 and the lower suction roller are equal, that is, the spacings on both sides thereof are consistent, further ensuring that the diaphragm will not be wrinkled or stretched when passing through.

[0035] In summary, the first water removal is carried out by squeezing the water-squeezing pressure roller and the rotating roller, and then the water on the front and back sides of the diaphragm is adsorbed by the upper water-absorbing roller and the lower water-absorbing roller respectively. In this way, water removal by the dual methods of squeezing water by the pressure roller and absorbing water by the water-absorbing roller can effectively remove most of the water on the diaphragm, improve the water removal effect, improve the ion conductivity of the diaphragm, thereby improving the discharge capacity and charging speed of the battery, and improving the performance of the battery. At the same time, the setting of the clamping driver can maintain the close contact between the water-squeezing pressure roller and the rotating roller, and improve the squeezing water removal effect. Through the setting of the vacuum part, both the upper water-absorbing roller and the lower water-absorbing roller have vacuum suction, which improves the adsorption water removal effect. Through the setting of the cleaning part, the water-absorbing roller can be self-cleaned, and foreign matter remaining on its surface and inside can be removed to prevent clogging, and a strong water removal effect can be maintained.

[0036] The above is only the implementation mode of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A diaphragm dewatering device, characterized in that: include: Rack (1); A water squeezing assembly (2), comprising a water squeezing pressure roller (21) and a rotating roller (22), wherein the water squeezing pressure roller (21) and the rotating roller (22) are arranged side by side on the frame (1), and the water squeezing pressure roller (21) is pressed against the rotating roller (22); as well as A water absorption assembly (3), comprising an upper water absorption roller (31) and a lower water absorption roller (32); along the moving direction of the diaphragm, the rotating roller (22), the upper water absorption roller (31) and the lower water absorption roller (32) are sequentially arranged in parallel on the frame (1); After the membrane passes through the water squeezing roller (21) and the rotating roller (22) to squeeze water, the front and back sides of the membrane pass through the upper water absorbing roller (31) and the lower water absorbing roller (32) in sequence to absorb water for the second time.

2. The membrane dewatering device according to claim 1, characterized in that: The water squeezing pressure roller component (21) comprises a water squeezing pressure roller (211) and a pressing driving unit (212); the pressing driving unit (212) is arranged on the frame (1); a driving end of the pressing driving unit (212) is connected to the water squeezing pressure roller (211) to drive the water squeezing pressure roller (211) to maintain a state of being pressed against the rotating roller component (22).

3. The membrane dewatering device according to claim 2, characterized in that: The clamping drive part (212) comprises two clamping drives (2121), two guide parts (2122) and two sliding parts (2123); the two guide parts (2122) are respectively arranged on the frame (1); the two sliding parts (2123) are respectively slidably arranged on the two guide parts (2122); the driving ends of the two clamping drives (2121) are respectively connected to the two sliding parts (2123); the two ends of the water squeezing roller (211) are respectively rotatably arranged on the two sliding parts (2123); the clamping drive (2121) drives the sliding part (2123) to drive the water squeezing roller (211) to press against the rotating roller (22) and maintain the pressed state.

4. The membrane dewatering device according to claim 1, characterized in that: The upper water-absorbing roller component (31) is located directly below the lower water-absorbing roller component (32).

5. The membrane dewatering device according to any one of claims 1 to 4, characterized in that: The upper water-absorbing roller component (31) comprises an upper water-absorbing roller (311) and a water-absorbing layer, wherein the water-absorbing layer is coated on the outside of the upper water-absorbing roller (311).

6. The membrane dewatering device according to claim 5, characterized in that: The upper water-absorbing roller (31) further comprises a vacuum portion (313), a hollow pipe being provided in the upper water-absorbing roller (311), and a vacuum end of the vacuum portion (313) being provided in the hollow pipe; a plurality of through holes (3111) are evenly distributed on the surface of the upper water-absorbing roller (311), and the through holes (3111) are connected to the hollow pipe.

7. The membrane dewatering device according to claim 6, characterized in that: The upper water-absorbing roller (31) further comprises a cleaning portion (314), and the cleaning portion (314) is communicated with the hollow pipe.

8. The membrane dewatering device according to claim 5, characterized in that: The upper water-absorbing roller (31) further comprises a rotation driving unit (312), wherein the rotation driving unit (312) is arranged on the frame (1), and a driving end of the rotation driving unit (312) is connected to the upper water-absorbing roller (311) to drive the upper water-absorbing roller (311) to rotate.

9. The membrane dewatering device according to claim 8, characterized in that: The rotating roller (22), the upper water-absorbing roller (311) and the lower water-absorbing roller (32) are respectively rotatably arranged on the frame (1), and the rotating roller (22), the upper water-absorbing roller (311) and the lower water-absorbing roller (32) have a rotation speed equal to a moving speed of the diaphragm.

10. The membrane dewatering device according to claim 9, characterized in that: The axial lengths of the rotating roller (22), the upper water-absorbing roller (311) and the lower water-absorbing roller (32) are equal.

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