Salt separation nanofiltration membrane production coating device

Abstract

The utility model discloses a salt separation nanofiltration membrane production coating device which comprises a fixing frame, a coating roller, a solution tank, a guide roller and a drying box, the guide roller which is rotatably connected is arranged on the inner wall of the fixing frame, the guide roller is composed of an upper roller and a lower roller, the upper roller and the lower roller are longitudinally distributed in a staggered mode, the coating roller is arranged on the side wall of the upper roller, and the solution tank is arranged in the coating roller. A solution tank is arranged below the coating roller, a liquid injection pipe is arranged on the right side wall of the solution tank, a drying box is fixedly connected to the top of the fixing frame, a fan, a heating coil and an air guide plate are fixedly connected to the interior of the drying box, the fan is fixedly connected to the upper portion of the heating coil, the air guide plate is arranged below the heating coil, and an air outlet is formed in the lower surface of the air guide plate. The coating device is composed of the fixing frame, the coating roller, the solution tank, the guide roller and the drying box, a polymer solution is evenly coated on the surface of a carrier while the carrier is conveniently guided and conveyed, and the drying box fixedly connected with the top is matched, so that the solution is conveniently and rapidly dried and shaped.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, specifically to a coating device for the production of salt separation nanofiltration membranes. Background Technology

[0002] Nanofiltration is a pressure-driven membrane separation process that falls between reverse osmosis and ultrafiltration. Research on nanofiltration membranes began in the 1970s and evolved from reverse osmosis membranes. It has several key characteristics: First, the pore size of nanofiltration membranes is around a few nanometers, and the molecular weight cutoff is between that of ultrafiltration and reverse osmosis, approximately 200-1000. Second, their surfaces are generally charged, repelling inorganic ions of the same charge, especially high-valence ions, where the sieving effect is significant. Third, the operating pressure is low, generally less than 1 MPa, offering advantages in energy consumption and equipment investment. Nanofiltration membranes are widely used in water softening and advanced drinking water treatment, separation, purification, and concentration of animal and plant products, wastewater treatment combined with biochemical methods, and the concentration and purification of chemical and pharmaceutical products.

[0003] Currently, in the production of salt-separating nanofiltration membranes, a polymer solution needs to be coated onto the surface of a nonwoven fabric carrier, and the polymer solution is then precipitated in a non-solution environment to produce the base membrane. However, to facilitate uniform coating, the polymer solution concentration is often reduced, causing it to spread during transport after coating on the carrier surface. This results in variations in the thickness of the base membrane, affecting the stability of salt-separating nanofiltration membrane production. Therefore, a coating device for salt-separating nanofiltration membrane production is proposed. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a coating device for the production of salt-separating nanofiltration membranes, solving the problem of uneven base membrane thickness that is easily generated in existing salt-separating nanofiltration membrane production. This invention utilizes a coating device composed of a fixed frame, coating rollers, a solution tank, guide rollers, and a drying box. This facilitates the guiding and conveying of the carrier while uniformly coating the polymer solution onto the surface of the carrier. Combined with the drying box fixedly connected at the top, it facilitates rapid drying and shaping of the solution, allowing the polymer solution to quickly precipitate out after immersion in a non-solvent to form a base membrane of a certain thickness, thereby improving the stability of salt-separating nanofiltration membrane production.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a coating device for producing salt separation nanofiltration membranes, comprising a fixed frame, a coating roller, a solution tank, a guide roller, and a drying chamber. The inner wall of the fixed frame is provided with a rotatably connected guide roller, which consists of an upper roller and a lower roller, which are longitudinally staggered. The side wall of the upper roller is provided with a coating roller, and a solution tank is provided below the coating roller. A liquid injection pipe is provided on the right side wall of the solution tank. A drying chamber is fixedly connected to the top of the fixed frame. A fan, a heating coil, and an air guide plate are fixedly connected inside the drying chamber. The fan is fixedly connected above the heating coil, and an air guide plate is provided below the heating coil. An air outlet is provided on the lower surface of the air guide plate.

[0008] As an improvement to the above technical solution, a coating sleeve is connected to the surface of the coating roller, and the surface of the coating sleeve is provided with uniformly distributed bristles.

[0009] As an improvement to the above technical solution, the central shaft of the guide roller is connected to a through-fixed frame, and a drive motor is fixedly connected to the side wall of the fixed frame. The output end of the drive motor is fixedly connected to the central shaft of the guide roller.

[0010] As an improvement to the above technical solution, the central shaft of the coating roller passes through the fixed frame and is rotatably connected to the fixed frame. A synchronous wheel one is fixedly connected to the central shaft of the coating roller, and a synchronous wheel two is fixedly connected to the end of the central shaft of the guide roller. A synchronous belt is provided between the synchronous wheel one and the synchronous wheel two.

[0011] As an improvement to the above technical solution, a scraper roller is provided at the connection between the solution tank and the coating roller, and the scraper roller is rotatably connected to the solution tank.

[0012] (III) Beneficial Effects

[0013] This invention provides a coating apparatus for the production of salt separation nanofiltration membranes. It has the following beneficial effects:

[0014] This invention utilizes a coating device consisting of a fixed frame, coating roller, solution tank, guide roller, and drying box. This facilitates the guiding and conveying of the carrier while uniformly coating the polymer solution onto the surface of the carrier. Combined with the drying box fixedly connected at the top, it facilitates rapid drying and shaping of the solution, allowing the polymer solution to quickly precipitate out after immersion in a non-solvent to form a base film of a certain thickness, thereby improving the stability of salt separation nanofiltration membrane production. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the coating device for producing salt separation nanofiltration membranes according to this utility model;

[0016] Figure 2This is a side cross-sectional view of the coating device for producing salt separation nanofiltration membranes according to this utility model;

[0017] Figure 3 This is a schematic diagram of the coating roller of this utility model.

[0018] In the diagram: Fixed frame-1, Coating roller-2, Solution tank-3, Guide roller-4, Drying box-5, Upper roller-6, Lower roller-7, Liquid injection pipe-8, Fan-9, Heating coil-10, Air guide plate-11, Air outlet-12, Coating sleeve-13, Brush bristles-14, Drive motor-15, Synchronous pulley one-16, Synchronous pulley two-17, Synchronous belt-18, Scraper roller-19. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-3 This utility model provides a technical solution: a coating device for producing salt separation nanofiltration membranes, including a fixed frame 1, a coating roller 2, a solution tank 3, a guide roller 4, and a drying chamber 5. The inner wall of the fixed frame 1 is provided with a rotatably connected guide roller 4, which consists of an upper roller 6 and a lower roller 7. The upper roller 6 and the lower roller 7 are longitudinally staggered. The side wall of the upper roller 6 is provided with the coating roller 2. The solution tank 3 is provided below the coating roller 2. The right side wall of the solution tank 3 is provided with a liquid injection pipe 8. The top of the fixed frame 1 is fixedly connected to the drying chamber 5. The inside of the drying chamber 5 is fixedly connected with a fan 9, a heating coil 10, and an air guide plate 11. The fan 9 is fixedly connected above the heating coil 10. The air guide plate 11 is provided below the heating coil 10. The lower surface of the air guide plate 11 is provided with an air outlet 12.

[0021] In a further improvement, a coating sleeve 13 is sleeved and connected to the surface of the coating roller 2. The surface of the coating sleeve 13 is provided with uniformly distributed bristles 14. By sleeved and connected to the surface of the coating roller 2 with a coating sleeve 13 with bristles 14, it is convenient to apply the solution to the surface of the carrier, which facilitates the formation of a film of a certain thickness. The design of the replaceable coating sleeve 13 also meets the convenience of adjustment under different production needs.

[0022] In a further improvement, the central axis of the guide roller 4 is connected to the through fixed frame 1, and a drive motor 15 is fixedly connected to the side wall of the fixed frame 1. The output end of the drive motor 15 is fixedly connected to the central axis of the guide roller 4. By fixing the drive motor 15 to the side wall of the fixed frame 1, it is convenient to drive the guide roller 4 to rotate, which facilitates the movement of the carrier.

[0023] In a further improvement, the central shaft of the coating roller 2 passes through the fixed frame 1 and is rotatably connected to the fixed frame 1. A synchronous wheel 16 is fixedly connected to the central shaft of the coating roller 2, and a synchronous wheel 17 is fixedly connected to the end of the central shaft of the guide roller 4. A synchronous belt 18 is provided between the synchronous wheel 16 and the synchronous wheel 17. By providing a synchronous wheel 16 on the central shaft of the coating roller 2, and cooperating with the synchronous wheel 17 on the surface of the central shaft of the guide roller 4, the coating roller 2 can rotate synchronously with the guide roller 4, which facilitates the coating of the solution onto the surface of the carrier.

[0024] Specifically, a scraper roller 19 is provided at the connection between the solution tank 3 and the coating roller 2. The scraper roller 19 is rotatably connected to the solution tank 3. By providing the scraper roller 19 on the surface of the solution tank 3, it is convenient to scrape off excess solution from the surface of the coating roller 2, which facilitates the control of the coating thickness of the coating roller 2.

[0025] In use, a carrier such as nonwoven fabric is passed through guide roller 4, and a polymer solution of a certain amount of melt is injected into solution tank 3. Guide roller 4 drives the carrier to move, and coating roller 2 rotates accordingly, so that the polymer solution in solution tank 3 is evenly coated on the surface of the carrier. After coating, the carrier passes through drying box 5, where hot air at a constant temperature is blown out by fan 9 and heating coil 10 to facilitate drying of the polymer solution, increase the concentration of the polymer solution, prevent the polymer solution from spreading on the surface of the carrier, and ensure that the polymer solution has a certain thickness when it is sent to the non-solvent for precipitation, thereby improving the stability of base film production.

[0026] This invention addresses the problem that in the production of salt-separating nanofiltration membranes, a polymer solution needs to be coated onto the surface of a nonwoven fabric carrier, and then the polymer solution precipitates out in a non-solvent environment to produce a base membrane. Because the polymer solution is often diluted to facilitate uniform coating, it tends to spread during transport after coating the carrier surface, causing variations in the base membrane thickness and affecting the stability of salt-separating nanofiltration membrane production. This invention utilizes a coating device consisting of a fixed frame 1, a coating roller 2, a solution tank 3, a guide roller 4, and a drying chamber 5. This facilitates the guiding and transport of the carrier while uniformly coating the polymer solution onto its surface. The drying chamber 5, fixedly connected at the top, allows for rapid drying and setting of the solution, enabling the polymer solution to quickly precipitate out after immersion in a non-solvent environment to form a base membrane of a certain thickness, thus improving the stability of salt-separating nanofiltration membrane production.

[0027] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A coating apparatus for producing salt separation nanofiltration membranes, comprising a fixed frame (1), a coating roller (2), a solution tank (3), a guide roller (4), and a drying chamber (5), characterized in that: The inner wall of the fixed frame (1) is provided with a rotatably connected guide roller (4). The guide roller (4) is composed of an upper roller (6) and a lower roller (7). The upper roller (6) and the lower roller (7) are longitudinally staggered. The side wall of the upper roller (6) is provided with a coating roller (2). The lower part of the coating roller (2) is provided with a solution tank (3). The right side wall of the solution tank (3) is provided with a liquid injection pipe (8). The top of the fixed frame (1) is fixedly connected with a drying box (5). The inside of the drying box (5) is fixedly connected with a fan (9), a heating coil (10) and a guide plate (11). The fan (9) is fixedly connected above the heating coil (10). The lower part of the heating coil (10) is provided with a guide plate (11). The lower surface of the guide plate (11) is provided with an air outlet (12).

2. The coating apparatus for producing salt separation nanofiltration membranes according to claim 1, characterized in that: The coating roller (2) is connected to a coating sleeve (13) which has uniformly distributed bristles (14) on its surface.

3. The coating apparatus for producing salt separation nanofiltration membranes according to claim 1, characterized in that: The central axis of the guide roller (4) is connected to the through fixed frame (1), and the side wall of the fixed frame (1) is fixedly connected to the drive motor (15), and the output end of the drive motor (15) is fixedly connected to the central axis of the guide roller (4).

4. The coating apparatus for producing salt separation nanofiltration membranes according to claim 1, characterized in that: The central axis of the coating roller (2) passes through the fixed frame (1) and is rotatably connected to the fixed frame (1). The central axis of the coating roller (2) is fixedly connected to a first synchronous wheel (16). The end of the central axis of the guide roller (4) is fixedly connected to a second synchronous wheel (17). A synchronous belt (18) is provided between the first synchronous wheel (16) and the second synchronous wheel (17).

5. The coating apparatus for producing salt separation nanofiltration membranes according to claim 1, characterized in that: A scraper roller (19) is provided at the connection between the solution tank (3) and the coating roller (2), and the scraper roller (19) is rotatably connected to the solution tank (3).

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