A nanofiltration membrane filament sealing device and sealing method

Abstract

This invention relates to the field of nanofiltration membrane sealing equipment technology, and in particular to a nanofiltration membrane filament sealing device. The nanofiltration membrane includes several filaments with overlapping ends. The sealing device includes: a frame with a feeding port; a clamping mechanism that uses the tension of the overlapping filaments to clamp the filaments; a positioning mechanism for the heat-sealing position of the nanofiltration membrane filaments, the positioning mechanism being arranged on the frame and above the clamping mechanism, the positioning mechanism being used to abut against the curved portion of the nanofiltration membrane filaments; and a heat-sealing mechanism for heat-sealing the ends of the nanofiltration membrane filaments, the heat-sealing mechanism including a heating wire for ironing the ends of the filaments to seal them. Through the design of the clamping mechanism, positioning mechanism, and heat-sealing mechanism, the heat-sealing position of the nanofiltration membrane is confirmed, and the nanofiltration membrane filaments are trimmed while sealing the ends of the nanofiltration membrane filaments.

Description

Technical Field

[0001] This invention relates to the field of nanofiltration membrane sealing equipment technology, and in particular to a nanofiltration membrane filament sealing device, and also to a method for sealing nanofiltration membrane filaments. Background Technology

[0002] Nanofiltration membranes are thin films with specific pore sizes that can filter out tiny particles, microorganisms, and solutes from solutions or gases. They are composed of components such as membrane fibers. The membrane fibers of a nanofiltration membrane have a nanoscale pore structure, and these fibers are typically hollow fibers. When placing a nanofiltration membrane inside a filter tube, the ends of the membrane need to be sealed and trimmed neatly. Current technology uses adhesive sealing, which requires trimming the ends of the membrane before dipping it in adhesive. The thickness of the adhesive dipped in the adhesive needs to be precisely controlled. Insufficient adhesive in the container can result in some membrane fibers not being sealed, affecting usability; excessive adhesive can lead to long, sealed membrane fibers, reducing the efficiency of the nanofiltration membrane within the same installation space. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the problem that the existing technology uses glue sealing, which requires the ends of the nanofiltration membrane to be trimmed and flat before being dipped in glue, and the glue thickness needs to be precisely controlled. Insufficient glue capacity in several containers will result in some membrane fibers not being sealed, affecting the use. If the glue capacity is too large, the sealed membrane fiber path will be too long, affecting the efficiency of the nanofiltration membrane in the same installation space. The present invention provides a nanofiltration membrane fiber sealing device and a nanofiltration membrane fiber sealing method.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a nanofiltration membrane filament sealing device, wherein the nanofiltration membrane includes a plurality of membrane filaments with their ends stacked together;

[0005] The sealing device includes:

[0006] The frame has a material discharge port.

[0007] The clamping mechanism uses the tension of the overlapping membrane fibers to hold the membrane fibers.

[0008] The positioning mechanism is used for the heat-sealing position of the nanofiltration membrane filaments. The positioning mechanism is arranged on the frame and is located above the clamping mechanism. The positioning mechanism is used to abut against the curved part of the nanofiltration membrane filaments.

[0009] The device also includes a heat-sealing mechanism for heat-sealing the ends of the nanofiltration membrane filaments. The heat-sealing mechanism includes a heating wire for ironing the ends of the filaments to seal them. Through the design of the clamping mechanism, positioning mechanism, and heat-sealing mechanism, the heat-sealing position of the nanofiltration membrane is confirmed. At the same time as sealing the ends of the nanofiltration membrane filaments, the filaments are trimmed. This results in a smaller proportion of the filaments occupied at the sealing point, allowing the filaments to have more effective length. Furthermore, after trimming the ends of the nanofiltration membrane filaments, they are easier to install inside the filter tube.

[0010] To address the issue of how to clamp the nanofiltration membrane without damaging it, a clamping mechanism is further included, comprising a clamping block, a clamping plate, a connecting rod, and a clamping drive. The clamping block is fixedly connected to the frame, and a clamping slot for placing the nanofiltration membrane is provided on the clamping block. One end of the connecting rod is fixedly connected to the clamping plate, and the other end passes through the clamping block and is connected to the output end of the clamping drive. The clamping drive is used to provide power to move the clamping plate away from or towards the opening of the clamping slot.

[0011] When the clamping plate is attached to the clamping block, the clamping slot of the clamping block is sealed.

[0012] To address the issue of nanofiltration membranes not meeting size requirements after heat sealing, a positioning mechanism is further included, comprising a positioning seat and a positioning drive. The positioning drive is fixedly connected to the frame, and the output end of the positioning drive is drivenly connected to the positioning seat. The positioning drive provides power to move the positioning seat away from or towards the clamping mechanism, and the bottom surface of the positioning seat provides a positioning reference surface for the nanofiltration membrane.

[0013] The device further includes a positioning drive component comprising a base, a positioning motor, a positioning lead screw, and a positioning nut seat. The base is connected to the frame, the positioning motor is fixedly connected to the base, the positioning lead screw is rotatably connected to the base, the output end of the positioning motor is drively connected to the input end of the positioning lead screw, the positioning motor provides power for the rotation of the positioning lead screw, the positioning lead screw and the positioning nut seat are threadedly connected, and the positioning nut seat and the positioning base are fixedly connected.

[0014] To address the issue of unstable movement of the positioning nut seat, a positioning drive component is further included, comprising a guide rod. One end of the guide rod is fixedly connected to the upper end of the base, and the other end passes through the positioning nut seat and is fixedly connected to the lower end of the base.

[0015] To address the issue of achieving efficient heat sealing, a heat sealing mechanism is further included, comprising a mounting base and a heat sealing drive. The heating wire is clamped on the mounting base, and the heat sealing drive provides power for the movement of the heating wire. The heat sealing drive is fixedly connected to the frame, and the output end of the heat sealing drive is fixedly connected to the mounting base.

[0016] The heat sealing drive unit includes a heat sealing motor, a heat sealing screw, and a heat sealing nut seat. The heat sealing motor is fixedly connected to the frame, the output end of the heat sealing motor is drivenly connected to the input end of the heat sealing screw, the heat sealing screw is fixedly connected to the heat sealing nut seat, and the heat sealing nut seat is fixedly connected to the mounting base.

[0017] Furthermore, the heating wire has a straight structure.

[0018] To address the issue of fumes generated during the heat sealing process affecting the operating environment, the sealing device further includes an exhaust mechanism comprising an exhaust fan and an exhaust duct. The exhaust fan is fixedly connected to the frame, with its input end aligned with the clamping mechanism, and its output end connected to the input end of the exhaust duct.

[0019] To address the issue of low production efficiency of a single heat-sealing mechanism, the system further includes a one-to-one correspondence between a positioning mechanism, a clamping mechanism, a heat-sealing mechanism, and an exhaust mechanism, with two clamping mechanisms arranged in total.

[0020] A method for sealing nanofiltration membrane fibers, using a nanofiltration membrane fiber sealing device, includes the following steps:

[0021] The nanofiltration membrane fibers are placed in the clamping slot of the clamping block. The curved part of the nanofiltration membrane fibers touches the bottom surface of the positioning seat to determine the position of the nanofiltration membrane fibers. After that, the clamping drive is activated, which moves the clamping plate closer to the clamping block until the clamping plate is against the clamping block. Under the tension of the nanofiltration membrane fibers, the nanofiltration membrane is fixed in the clamping slot. The heat sealing drive is activated, which moves the heating wire closer to the end of the nanofiltration membrane fibers. When the heating wire touches the end of the nanofiltration membrane fibers, it heat-melts and seals it. After the position of the heating wire passes the clamping plate, the end of the nanofiltration membrane fibers is sealed. The heating wire is reset, the clamping plate is released, and the nanofiltration membrane is removed. During this process, the exhaust fan works continuously to remove the fumes generated by the heating wire during the heat sealing process. The two clamping mechanisms are used alternately.

[0022] The beneficial effects of the present invention are as follows: The nanofiltration membrane filament sealing device provided by the present invention, through the design of clamping mechanism, positioning mechanism and heat sealing mechanism, realizes the confirmation of the heat sealing position of nanofiltration membrane, and completes the trimming of nanofiltration membrane filaments at the same time as sealing the ends of nanofiltration membrane filaments. On the one hand, it makes the overall proportion of filaments occupied by the sealing point small, so that the filaments have more effective length. On the other hand, after the ends of nanofiltration membrane filaments are trimmed, it is easy to install them in the filter tube. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is the present invention. Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0026] Figure 3 This is the present invention. Figure 1 Enlarged structural diagram at point B;

[0027] Figure 4 This is the present invention. Figure 2 Enlarged structural diagram at point C;

[0028] Figure 5 This is a schematic diagram of the nanofiltration membrane of the present invention.

[0029] In the diagram: 1. Frame; 11. Material discharge port;

[0030] 2. Clamping mechanism; 21. Clamping block; 211. Clamping groove; 22. Clamping plate; 23. Connecting rod; 24. Clamping drive component;

[0031] 3. Positioning mechanism; 31. Positioning seat; 32. Positioning drive component; 321. Base; 322. Positioning motor; 323. Positioning lead screw; 324. Positioning nut seat; 325. Guide rod.

[0032] 4. Heat sealing mechanism; 41. Heating wire; 42. Heat sealing drive component; 421. Heat sealing motor; 422. Heat sealing screw; 423. Heat sealing nut seat; 43. Mounting base.

[0033] 5. Exhaust system; 51. Exhaust fan; 52. Exhaust duct;

[0034] 6. Nanofiltration membrane; 61. Membrane fibers; 62. Bending section; 63. Fixing mesh. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0036] A nanofiltration membrane fiber sealing device, such as Figure 5 As shown, the nanofiltration membrane 6 includes a plurality of membrane fibers 61 with folded ends. The nanofiltration membrane 6 also includes an elastic fixing mesh 63, which covers the outside of the membrane fibers 61 and is inserted into the curved portion 62 of the membrane fibers 61. Figure 3 As shown, the port of the fixed net 63 is located above the port of the membrane filament 61;

[0037] like Figure 1 This is a schematic diagram of the structure of the present invention, the sealing device comprising:

[0038] The frame 1 has a discharge port 11, which is used to allow waste material heated off the membrane filament 61 to pass through and be collected.

[0039] like Figure 3 , 4 As shown, the clamping mechanism 2 uses the tension of the overlapping membrane filaments 61 to clamp the membrane filaments 61. The clamping mechanism 2 includes a clamping block 21, a clamping plate 22, a connecting rod 23, and a clamping drive 24. The clamping block 21 is fixedly connected to the frame 1. The clamping block 21 has a clamping groove 211 for placing the nanofiltration membrane 6. One end of the connecting rod 23 is fixedly connected to the clamping plate 22, and the other end passes through the clamping block 21 and is connected to the output end of the clamping drive 24. The clamping drive 24 is used to provide power to the clamping plate 22 away from or near the opening of the clamping groove 211. The clamping drive 24 can be a power element such as a cylinder or a screw drive mechanism. The clamping groove 211 is an arc groove.

[0040] When the clamping plate 22 is attached to the clamping block 21, the clamping groove 211 of the clamping block 21 is sealed, and the clamping plate 22 and the clamping groove 211 form a clamping cavity. The initial size of the clamping cavity is smaller than the size of the nanofiltration membrane. Therefore, after the nanofiltration membrane 6 is placed in the clamping cavity, the nanofiltration membrane 6 will shrink and its tension will be used to fix the nanofiltration membrane in the clamping cavity, and the nanofiltration membrane will not be damaged while being fixed.

[0041] like Figure 3 , 4 As shown, the positioning mechanism 3 is used for the heat-sealing position of the membrane filaments 61 of the nanofiltration membrane 6. The positioning mechanism 3 is arranged on the frame 1 and is located above the clamping mechanism 2. The positioning mechanism 3 is used to abut the bent portion 62 of the membrane filaments 61 of the nanofiltration membrane 6. The positioning mechanism 3 includes a positioning seat 31 and a positioning drive 32. The positioning drive 32 is fixedly connected to the frame 1. The output end of the positioning drive 32 is connected to the positioning seat 31. The positioning drive 32 is used to provide power for the positioning seat 31 to move away from or closer to the clamping mechanism 2. The bottom surface of the positioning seat 31 is used to provide a positioning reference surface for the nanofiltration membrane 6. The positioning drive 32 allows the position of the positioning seat 31 to be adjusted to accommodate the required length of the nanofiltration membrane 6 for the filter tube of the specified specifications.

[0042] The positioning drive component 32 includes a base 321, a positioning motor 322, a positioning lead screw 323, and a positioning nut seat 324. The base 321 is connected to the frame 1. The positioning motor 322 is fixedly connected to the base 321. The positioning lead screw 323 is rotatably connected to the base 321. The output end of the positioning motor 322 is connected to the input end of the positioning lead screw 323. The positioning motor 322 is used to provide power for the rotation of the positioning lead screw 323. The positioning lead screw 323 is threadedly connected to the positioning nut seat 324. The positioning nut seat 324 is fixedly connected to the positioning base 31.

[0043] The positioning drive component 32 can also be a power component such as a cylinder.

[0044] The positioning drive component 32 includes a guide rod 325. One end of the guide rod 325 is fixedly connected to the upper end of the base 321, and the other end passes through the positioning nut seat 324 and is fixedly connected to the lower end of the base 321. The guide rod 325 can increase the stability of the positioning nut seat 324.

[0045] like Figure 3 , 4 As shown, the heat sealing mechanism 4 is used to heat seal the ends of the membrane fibers 61 of the nanofiltration membrane 6 and to trim the ends of the nanofiltration membrane 6. The heat sealing mechanism 4 includes a heating wire 41, which is used to iron the ends of the membrane fibers 61 to seal the ends. When the heating wire 41 is energized and heated, it can melt and trim the membrane fibers 61 when it comes into contact with the membrane fibers 61 of the nanofiltration membrane 6, making the ends flush, and can also close the ends of the membrane fibers 61, thus achieving heat sealing.

[0046] The heat sealing mechanism 4 includes a mounting base 43 and a heat sealing drive 42. The heating wire 41 is clamped on the mounting base 43. The heat sealing drive 42 is used to provide power for the movement of the heating wire 41. The heat sealing drive 42 is fixedly connected to the frame 1. The output end of the heat sealing drive 42 is fixedly connected to the mounting base 43.

[0047] The heat sealing drive component 42 includes a heat sealing motor 421, a heat sealing screw 422, and a heat sealing nut seat 423. The heat sealing motor 421 is fixedly connected to the frame 1. The output end of the heat sealing motor 421 is connected to the input end of the heat sealing screw 422. The heat sealing screw 422 is fixedly connected to the heat sealing nut seat 423. The heat sealing nut seat 423 is fixedly connected to the mounting base 43. The heat sealing drive component 42 can also be a power element such as a cylinder.

[0048] The heating wire 41 has a straight structure, and the membrane filament 61 is melted and trimmed so that its ends are flush.

[0049] like Figure 3 , 4 As shown, the sealing device includes an exhaust mechanism 5, which includes an exhaust fan 51 and an exhaust pipe 52. The exhaust fan 51 is fixedly connected to the frame 1. The input end of the exhaust fan 51 is aligned with the clamping mechanism 2, and the output end of the exhaust fan 51 is connected to the input end of the exhaust pipe 52. The exhaust mechanism 5 removes the fumes generated by the heat sealing mechanism 4 in contact with the nanofiltration membrane 6, ensuring the working environment.

[0050] The positioning mechanism 3, clamping mechanism 2, heat sealing mechanism 4 and exhaust mechanism 5 are all one-to-one, and there are two clamping mechanisms 2. The alternating use of the two heat sealing mechanisms 4 can improve production efficiency. There are two or more positioning mechanisms 3, clamping mechanism 2, heat sealing mechanism 4 and exhaust mechanism 5. The number of corresponding equipment installed is not specifically limited in this application.

[0051] A method for sealing nanofiltration membrane fibers, using a nanofiltration membrane fiber sealing device, includes the following steps:

[0052] The nanofiltration membrane 6 fibers 61 are placed in the clamping groove 211 of the clamping block 21. The bent portion 62 of the nanofiltration membrane 6 fibers 61 touches the bottom surface of the positioning seat 31. After the position of the nanofiltration membrane 6 fibers 61 is determined, the clamping drive 24 is activated, causing the clamping plate 22 to move closer to the clamping block 21 until the clamping plate 22 is in contact with the clamping block 21. Under the tension of the nanofiltration membrane 6 fibers 61, the nanofiltration membrane 6 is fixed in the clamping groove 211. The heat sealing drive 42 is then activated. The heating wire 41 is brought close to the end of the membrane fiber 61 of the nanofiltration membrane 6. When the heating wire 41 touches the end of the membrane fiber 61 of the nanofiltration membrane 6, it heat-seals it. After the position of the heating wire 41 passes the clamping plate 22, the end of the membrane fiber 61 of the nanofiltration membrane 6 is sealed. The heating wire 41 is reset, the clamping plate 22 is released and the nanofiltration membrane 6 is removed. During this process, the exhaust fan 51 continues to work to remove the fumes generated by the heating wire 41 during the heat sealing process. The two clamping mechanisms 2 are used alternately.

[0053] In use, the nanofiltration membrane 6 is placed in the clamping slot 211. The nanofiltration membrane 6 is moved until the curved portion 62 of the membrane filaments 61 touches the bottom surface of the positioning seat 31, confirming the heat-sealing position of the nanofiltration membrane 6. The clamping drive 24 is activated, causing the clamping plate 22 to approach and abut against the clamping block 21. As the clamping plate 22 approaches the clamping block 21, it compresses the nanofiltration membrane 6, causing it to contract and thus giving it elastic tension. This allows the nanofiltration membrane 6 to be fixed in the clamping slot 211, completing the clamping of the nanofiltration membrane 6. The heat sealing drive 42 is activated, causing the heating wire 41 to approach the end of the membrane fiber 61 of the nanofiltration membrane 6. When the heating wire 41 touches the end of the membrane fiber 61 of the nanofiltration membrane 6, it heat-melts and seals the end and melts off the excess membrane fiber. After the position of the heating wire 41 passes the clamping plate 22, the end of the membrane fiber 61 of the nanofiltration membrane 6 is sealed. During this process, the exhaust fan 51 continues to work to remove the fumes generated by the heating wire 41 during the heat sealing process. The two clamping mechanisms 2 are used alternately. After the heat sealing and trimming are completed, the heating wire 41 is reset, the clamping plate 22 moves away from the clamping block 21, and the nanofiltration membrane 6 is removed.

[0054] If it is necessary to adjust the length of the nanofiltration membrane 6 installed in the filter tube, the positioning motor 322 is started, causing the positioning screw 323 to rotate. The positioning screw 323 drives the positioning nut seat 324 to rise or fall, and the positioning nut seat 324 drives the positioning seat 31 to rise or fall, thereby determining the length of the nanofiltration membrane 6.

[0055] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A nanofiltration membrane fiber sealing device, characterized in that, The nanofiltration membrane (6) includes several membrane fibers (61) with their ends folded together. The sealing device includes: The frame (1) has a material discharge port (11) on it. Clamping mechanism (2) uses the tension of the overlapping membrane fibers (61) to clamp the membrane fibers (61). Positioning mechanism (3) is used for heat sealing of the membrane filament (61) of nanofiltration membrane (6). The positioning mechanism (3) is arranged on the frame (1) and is located above the clamping mechanism (2). The positioning mechanism (3) is used to abut against the bend (62) of the membrane filament (61) of nanofiltration membrane (6). And a heat sealing mechanism (4), which is used to heat seal the ends of the membrane fibers (61) of the nanofiltration membrane (6) and to flatten the ends of the nanofiltration membrane. The heat sealing mechanism (4) includes a heating wire (41) for ironing the ends of the membrane fibers (61) to seal the ends. The heat sealing mechanism (4) includes a mounting base (43) and a heat sealing drive (42). The heating wire (41) is clamped on the mounting base (43). The heat sealing drive (42) is used to provide power for the movement of the heating wire (41). The heat sealing drive (42) is fixedly connected to the frame (1). The output end of the heat sealing drive (42) is fixedly connected to the mounting base (43). The clamping mechanism (2) includes a clamping block (21), a clamping plate (22), a connecting rod (23), and a clamping drive (24). The clamping block (21) is fixedly connected to the frame (1). The clamping block (21) has a clamping groove (211) for placing the nanofiltration membrane (6). One end of the connecting rod (23) is fixedly connected to the clamping plate (22), and the other end passes through the output end of the clamping block (21) and is connected to the clamping drive (24). The clamping drive (24) is used to provide power to the clamping plate (22) to move away from or near the opening of the clamping groove (211). When the clamping plate (22) is against the clamping block (21), the clamping groove (211) of the clamping block (21) is sealed.

2. The nanofiltration membrane fiber sealing device as described in claim 1, characterized in that: The positioning mechanism (3) includes a positioning seat (31) and a positioning drive (32). The positioning drive (32) is fixedly connected to the frame (1). The output end of the positioning drive (32) is connected to the positioning seat (31) in a transmission manner. The positioning drive (32) is used to provide power for the positioning seat (31) to move away from or closer to the clamping mechanism (2). The bottom surface of the positioning seat (31) is used to provide a positioning reference surface for the nanofiltration membrane (6).

3. The nanofiltration membrane fiber sealing device as described in claim 2, characterized in that: The positioning drive component (32) includes a base (321), a positioning motor (322), a positioning lead screw (323), and a positioning nut seat (324). The base (321) is connected to the frame (1). The positioning motor (322) is fixedly connected to the base (321). The positioning lead screw (323) is rotatably connected to the base (321). The output end of the positioning motor (322) and the input end of the positioning lead screw (323) are connected in a transmission manner. The positioning motor (322) is used to provide power for the rotation of the positioning lead screw (323). The positioning lead screw (323) and the positioning nut seat (324) are threadedly connected. The positioning nut seat (324) and the positioning seat (31) are fixedly connected.

4. The nanofiltration membrane fiber sealing device as described in claim 3, characterized in that: The positioning drive component (32) includes a guide rod (325), one end of which is fixedly connected to the upper end of the base (321), and the other end passes through the positioning nut seat (324) and is fixedly connected to the lower end of the base (321).

5. The nanofiltration membrane fiber sealing device as described in claim 1, characterized in that: The heating wire (41) has a straight structure.

6. The nanofiltration membrane fiber sealing device as described in claim 2, characterized in that: The heat sealing drive (42) includes a heat sealing motor (421), a heat sealing screw (422), and a heat sealing nut seat (423). The heat sealing motor (421) is fixedly connected to the frame (1). The output end of the heat sealing motor (421) is connected to the input end of the heat sealing screw (422). The heat sealing screw (422) is fixedly connected to the heat sealing nut seat (423). The heat sealing nut seat (423) is fixedly connected to the mounting base (43).

7. The nanofiltration membrane fiber sealing device as described in claim 6, characterized in that: The sealing device includes an exhaust mechanism (5), which includes an exhaust fan (51) and an exhaust pipe (52). The exhaust fan (51) is fixedly connected to the frame (1). The input end of the exhaust fan (51) is aligned with the clamping mechanism (2). The output end of the exhaust fan (51) is connected to the input end of the exhaust pipe (52).

8. The nanofiltration membrane fiber sealing device as described in claim 7, characterized in that: The positioning mechanism (3), clamping mechanism (2), heat sealing mechanism (4) and exhaust mechanism (5) are all in one-to-one correspondence, and there are two clamping mechanisms (2).

9. A method for sealing nanofiltration membrane fibers, using the nanofiltration membrane fiber sealing device as described in claim 7, characterized in that: Includes the following steps: Place the membrane fibers (61) of the nanofiltration membrane (6) into the clamping groove (211) of the clamping block (21), and bring the bent portion (62) of the membrane fibers (61) of the nanofiltration membrane (6) to the bottom surface of the positioning seat (31) to determine the position of the membrane fibers (61) of the nanofiltration membrane (6). Then, start the clamping drive (24) to bring the clamping plate (22) close to the clamping block (21) until the clamping plate (22) is against the clamping block (21). Under the tension of the membrane fibers (61) of the nanofiltration membrane (6), the nanofiltration membrane (6) is fixed in the clamping groove (211). The heat sealing drive (4) is then activated. 2) Start the heating wire (41) to approach the end of the membrane fiber (61) of the nanofiltration membrane (6). When the heating wire (41) touches the end of the membrane fiber (61) of the nanofiltration membrane (6) and heat-seales it, the position of the heating wire (41) passes the clamp (22) and the end of the membrane fiber (61) of the nanofiltration membrane (6) is sealed. The heating wire (41) is reset and the clamp (22) is released to remove the nanofiltration membrane (6). During this process, the exhaust fan (51) continues to work to remove the flue gas generated by the heating wire (41) during the heat sealing process. The two clamping mechanisms (2) are used in turn.

Images