Nanofiltration membrane system and application thereof

Abstract

The invention relates to the technical field of filtration, in particular to a nanofiltration membrane system and application thereof. Comprising a barrel, a bracket is arranged below the barrel, the upper end of an inner pipe is fixedly and hermetically connected with a top plate of the barrel, three partition plates are arranged in the barrel, a turntable is rotatably arranged below the inner pipe, an output shaft of a first motor is concentrically and fixedly connected with the turntable, and the partition plates are slidably and hermetically connected with the side wall of the barrel; the three partition plates, the inner pipe and the rotary disc divide the interior of the barrel into a first cavity, a second cavity and a third cavity which are independent of one another, three supporting arms are fixed to the outer edge of the rotary disc and located in the first cavity, the second cavity and the third cavity respectively, and membrane assemblies are inserted into the supporting arms respectively. And under the work division operation mode of the three cavities, the first cavity is used for installing a new membrane module, the second cavity executes the core function of filtration, and the third cavity is responsible for flushing and temporary storage of waste membranes, so that continuous circulation of filtration, flushing and replacement is formed. According to the design, echelon utilization and full-life-cycle management of the membrane module are realized.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of filtration, in particular to a nanofiltration membrane system and application thereof. BACKGROUND

[0002] As a high-efficiency water treatment and material separation method, the nanofiltration membrane separation technology is widely used in the fields of chemical industry, environmental protection and food processing. The traditional nanofiltration membrane system generally faces problems such as easy contamination of membrane assemblies, flux attenuation and limited service life during operation, and needs to be frequently stopped for cleaning or replacement, which seriously affects the production continuity. The existing device adopts a fixed membrane assembly layout, and the whole structure needs to be disassembled for maintenance, which is complex and time-consuming. When the disassembled membrane assembly is repaired, the membrane assembly needs to be flushed by using a flushing device, and the flushing system needs to be provided during the repair. In addition, the conventional system lacks real-time recognition and quick replacement mechanism for damaged membrane assemblies, and it is difficult to realize continuous operation, and the insufficient backflow of part of the filtrate also causes resource waste. In view of the above problems, it is urgent to develop a nanofiltration membrane system with dynamic adjustment capability, supporting online maintenance and effectively improving the cleaning efficiency of the membrane assembly, so as to reduce the operation and maintenance cost, prolong the service life of the membrane assembly and guarantee the production stability. SUMMARY

[0003] The main purpose of the application is to provide a nanofiltration membrane system which can conveniently flush the damaged membrane assembly before replacing it, and conveniently repair the damaged membrane assembly, and does not need to set a cleaning device to clean the damaged membrane assembly before repairing.

[0004] In order to achieve the above purpose, the technical scheme provided by the application is: The application relates to a nanofiltration membrane system, which comprises a barrel, a door plate detachably and fixedly connected to one side of the barrel, a bracket arranged below the barrel, a vibration assembly connecting the bracket with the barrel, an inner tube concentrically arranged in the barrel, the inner tube being fixedly and sealingly connected to the top plate of the barrel, three partition plates uniformly arranged on the circumference of the barrel, a rotating disc rotatably arranged below the inner tube, the rotating disc being rotatably and sealingly connected to the bottom plate of the barrel and the lower end of the inner tube, a first motor fixed to the lower end of the barrel, the output shaft of the first motor being fixedly connected to the rotating disc, the partition plates being slidingly and sealingly connected to the side wall of the barrel, the three partition plates, the inner tube and the rotating disc dividing the barrel into three independent first, second and third cavities, three supporting arms fixed to the outer edge of the rotating disc, the three supporting arms being respectively located in the first, second and third cavities, gaps being formed between the supporting arms and the partition plates, membrane assemblies being inserted into the supporting arms, the rotating disc being connected to the partition plates through a transmission assembly, and the rotating disc being capable of sliding the partition plates to the outside of the barrel and giving way to the supporting arms through the transmission assembly when the rotating disc rotates; a first mounting sleeve being arranged on the top plate of the barrel above the second cavity, the lower end of the first mounting sleeve being sealingly contacted with the upper end of the membrane assembly in the second cavity, a second mounting sleeve being arranged on the top plate of the barrel above the third cavity, the first mounting sleeve being communicated with a raw liquid tank, the lower end of the second cavity being communicated with a filtrate tank, the filtrate tank being communicated with the second mounting sleeve, and the lower end of the third cavity being communicated with the raw liquid tank.

[0005] Specifically, the bracket is fixed to one side of the bracket, and the raw liquid tank and the filtrate tank are fixed on the bracket. The inlet pipe and the outlet pipe are arranged on the raw liquid tank.

[0006] Specifically, the vibration assembly comprises a connecting frame fixed to the lower end of the barrel, the connecting frame penetrating through the bracket, the connecting frame being slidingly connected to the bracket, the connecting frame being capable of sliding in the vertical direction of the bracket, a supporting block being fixed to the bracket, the supporting block limiting the lower end of the connecting frame, a second motor being fixed to the bracket, a cam being fixed to the output shaft of the second motor, and the working surface of the cam being in contact with the lower end of the connecting frame.

[0007] Specifically, the upper and lower ends of the partition plate are slidingly and sealingly connected to the top plate and the bottom plate of the barrel respectively, and the end of the partition plate facing the shaft of the barrel is sealingly contacted with the outer edge of the inner tube and the outer edge of the rotating disc.

[0008] Specifically, the outlet end of the raw liquid tank is communicated with the first mounting sleeve through a first soft pipe, the lower end of the second cavity is communicated with the filtrate tank through a first soft water pipe, the outlet end of the filtrate tank is communicated with the second mounting sleeve through a second soft pipe, the lower end of the third cavity is communicated with the raw liquid tank through a second soft water pipe, a first water pump is arranged on the first soft pipe, a second water pump is arranged on the second soft pipe, a chroma monitor is arranged on the filtrate tank, and the chroma monitor is electrically connected to the first motor through a controller.

[0009] Specifically, the transmission assembly comprises a first bevel gear fixedly connected concentrically with the rotating disc, a second bevel gear corresponding to the partition plate rotatably connected to the inner tube, the first bevel gear meshes with the second bevel gear, a reciprocating lead screw is fixed concentrically on the rotating shaft of the second bevel gear, a sleeve is arranged outside the reciprocating lead screw, the sleeve, the reciprocating lead screw and the balls in the sleeve constitute a reciprocating lead screw pair, the sleeve is fixedly connected with the partition plate on one side, and the second bevel gear drives the reciprocating lead screw to rotate when the rotating disc drives the first bevel gear to rotate, the partition plate moves first to the outer side of the cylinder and then to the center of the cylinder during rotation of the reciprocating lead screw.

[0010] Specifically, a square hole is formed in the support arm, and a square block is fixedly connected to the lower end of the membrane assembly.

[0011] Specifically, the door plate corresponds to the first cavity.

[0012] Application of the nanofiltration membrane system: start the first motor, the first motor drives the rotating disc and the support arm to rotate, the rotating disc drives the partition plate to move first to the outer side of the cylinder through the transmission assembly during rotation of the rotating disc, the partition plate gives way to the support arm after moving to the outer side of the cylinder, the support arms in the first cavity, the second cavity and the third cavity are exchanged, the partition plate moves to the center of the cylinder through the transmission assembly during subsequent rotation of the rotating disc, and the support arms in the first cavity, the second cavity and the third cavity are exchanged.

[0013] Open the door plate to install the two membrane assemblies on the two adjacent support arms respectively, and make the two support arms with the membrane assemblies located in the first cavity and the second cavity respectively. At this time, there is no membrane assembly in the third cavity, and the upper end of the membrane assembly in the second cavity is in sealing contact and communication with the first mounting sleeve.

[0014] The raw solution in the raw solution tank enters the membrane assembly in the second cavity through the first mounting sleeve and is filtered to form a filtrate, the filtrate enters the filtrate tank, and the filtrate in the filtrate tank enters the third cavity through the second mounting sleeve, and the filtrate in the third cavity flows back to the raw solution tank again.

[0015] When the membrane assembly in the second cavity is damaged, the rotating disc is rotated, the membrane assembly in the second cavity is moved to the third cavity, and the membrane assembly in the first cavity enters the second cavity. At this time, there is no membrane assembly on the support arm in the first cavity, the door plate is opened, and the membrane assembly is installed on the support arm of the first cavity. At this time, the three support arms all have membrane assemblies, and the damaged membrane assembly is located in the third cavity.

[0016] When the raw liquid in the raw liquid tank is treated subsequently, the membrane assembly in the second cavity filters the raw liquid, the filtrate enters the third cavity through the second mounting sleeve after entering the filtrate tank, and the damaged membrane assembly in the third cavity is washed, and the filtrate washed to the damaged membrane assembly flows back to the raw liquid tank and is filtered by the membrane assembly in the second cavity again.

[0017] When the damaged membrane assembly in the third cavity is washed, the vibration assembly makes the cylinder vibrate up and down, which can improve the washing effect of the damaged membrane assembly.

[0018] When the membrane assembly in the second cavity is damaged, the system has two damaged membrane assemblies in this state, and they are located in the second cavity and the third cavity respectively, and the damaged membrane assembly in the third cavity has been washed clean.

[0019] Then start the first motor to make the rotating disc rotate, when the damaged membrane assembly washed clean enters the first cavity, the damaged membrane assembly washed clean can be taken down for maintenance, and after the damaged membrane assembly washed clean is taken down, a new membrane assembly is installed on the arm in the first cavity.

[0020] In the system, the membrane assembly in the second cavity filters the raw liquid, the damaged membrane assembly is transferred to the third cavity for washing, and the washed membrane assembly moves to the first cavity for replacement.

[0021] Compared with the prior art, the beneficial effects of the present application are: 1、The system adopts a branch arm square hole plug-in design, the membrane assembly is modularly installed through detachable blocks, and the damaged membrane assembly can be replaced individually without stopping the machine.

[0022] 2、The performance of the membrane assembly is detected in real time by the colorimeter on the filtrate tank, the controller is linked with the first motor, the system can automatically identify the damaged membrane assembly and drive the rotating disc to switch it to the washing station, and at the same time, the standby membrane assembly is switched to the working position.

[0023] 3、After the damaged membrane assembly is transferred to the third cavity, it is washed with the filtered filtrate, and the washing waste liquid returns to the raw liquid tank through the return pipeline for recycling, which not only avoids the use of chemical cleaning agents, but also realizes closed-loop utilization of water resources, reduces energy consumption and waste liquid treatment cost.

[0024] 4. The vibration assembly is driven by the motor to periodically vibrate the cylinder, which strengthens the effect of stripping the surface contaminants of the membrane, especially for deep blockages; the reciprocating screw drive mechanism synchronously driven moves the baffle radially, dynamically adjusts the sealing contact surface, ensures the precise switching of the cavity isolation and the arm clearance, and balances the sealing reliability and the operation flexibility.

[0025] 5. In the three-cavity working mode, the first cavity is used for installing the new membrane assembly, the second cavity performs the filtering core function, and the third cavity is responsible for washing and temporary storage of waste membranes, forming a continuous cycle of "filtration, washing, and replacement". This design realizes the step-by-step utilization and full life cycle management of the membrane assembly. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic view of the present application.

[0027] Figure 2 is a schematic view of the connection of the stock solution tank, the filtrate tank, the first installation sleeve, and the second installation sleeve.

[0028] Figure 3 is a schematic view of the cross-sectional structure of the cylinder.

[0029] Figure 4 is a schematic view of the connection of the arm and the membrane assembly.

[0030] Figure 5 is a schematic view of the arm on the turntable.

[0031] Figure 6 is a sectional view of the present application.

[0032] Figure 7 is Figure 6 is an enlarged view of area A.

[0033] Figure 8 is a top view of the meshing of the first bevel gear and the second bevel gear.

[0034] Figure 9 is a schematic view of the cooperation of the cam and the connecting frame.

[0035] The names of the parts in the drawings are: 1, door plate; 2, cylinder; 201, first mounting sleeve; 202, second mounting sleeve; 3, first hose; 4, second hose; 5, stock solution tank; 6, filtrate tank; 7, support; 8, connecting frame; 9, bracket; 10, first water pump; 11, second water pump; 12, colorimetric monitor; 13, partition; 14, membrane module; 15, first cavity; 16, second cavity; 17, third cavity; 18, first bevel gear; 19, rotating disc; 191, support arm; 20, square hole; 21, first motor; 22, inner tube; 23, second motor; 24, cam; 25, sleeve; 26, reciprocating lead screw; 27, support block; 28, first flexible drain pipe; 29, second flexible drain pipe; 30, second bevel gear. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all.

[0037] As shown in the drawings, the nanofiltration membrane system comprises a cylinder 2, and a door plate 1 is detachably and fixedly connected to one side of the cylinder 2. Figures 1-9

[0038] The cylinder 2 is provided below with a bracket 9, and the bracket 9 is connected with the cylinder 2 through a vibration assembly.

[0039] The vibration assembly comprises a connecting frame 8 fixed to the lower end of the cylinder 2, the connecting frame 8 penetrates through the bracket 9, the connecting frame 8 is slidingly connected with the bracket 9, the connecting frame 8 can slide in the vertical direction of the bracket 9, the bracket 9 is fixed with a support block 27, the support block 27 limits the lower end of the connecting frame 8, the bracket 9 is fixed with a second motor 23, a cam 24 is fixed to the output shaft of the second motor 23, and the working surface of the cam 24 is in contact with the lower end of the connecting frame 8. When the second motor 23 drives the cam 24 to rotate, the connecting frame 8 can drive the cylinder 2 to vibrate up and down.

[0040] The inner tube 22 is concentrically arranged in the cylinder 2, and the upper end of the inner tube 22 is fixedly and sealingly connected with the top plate of the cylinder 2.

[0041] Three partition plates 13 are evenly arranged on the circumference of the cylinder 2.

[0042] The rotating disc 19 is rotatably arranged below the inner tube 22, and the rotating disc 19 is rotatably and sealingly connected with the bottom plate of the cylinder 2 and the lower end of the inner tube 22. The first motor 21 is fixed to the lower end of the cylinder 2, and the output shaft of the first motor 21 is fixedly connected with the rotating disc 19 in a concentric manner.

[0043] ​The upper and lower ends of the partition plate 13 are respectively in sliding sealing connection with the top plate and the bottom plate of the cylinder body 2, the end of the partition plate 13 towards the axis of the cylinder body 2 is in sealing contact with the outer edge of the inner tube 22 and the outer edge of the rotating disc 19, and the partition plate 13 is in sliding sealing connection with the side wall of the cylinder body 2. The three partition plates 13, the inner tube 22 and the rotating disc 19 divide the inside of the cylinder body 2 into the first cavity 15, the second cavity 16 and the third cavity 17 which are independent of each other. In the initial state, the door plate 1 corresponds to the first cavity 15.

[0044] The outer edge of the rotating disc 19 is fixed with three supporting arms 19, and the three supporting arms 19 are respectively located in the first cavity 15, the second cavity 16 and the third cavity 17, and there is a gap between the supporting arms 19 and the partition plate 13.

[0045] The supporting arms 19 are respectively inserted with the membrane assemblies 14. Specifically, the supporting arms 19 are provided with square holes 20, and the lower end of the membrane assembly 14 is fixed with a square block which is detachably and fixedly installed in the square hole 20.

[0046] The rotating disc 19 is connected with the partition plate 13 through a transmission assembly. When the rotating disc 19 rotates, the partition plate 13 can slide to the outside of the cylinder body 2 and give way to the supporting arms 19 through the transmission assembly.

[0047] The transmission assembly comprises a first bevel gear 18 which is fixedly connected with the rotating disc 19 in a concentric manner. The inner tube 22 is rotatably connected with a second bevel gear 30 corresponding to the partition plate 13, and the first bevel gear 18 is in meshing connection with the second bevel gear 30. A reciprocating lead screw 26 is fixedly connected with the rotating shaft of the second bevel gear 30 in a concentric manner, and a sleeve 25 is sleeved outside the reciprocating lead screw 26. The sleeve 25, the reciprocating lead screw 26 and the ball in the sleeve 25 constitute a reciprocating lead screw pair, the sleeve 25 is fixedly connected with the partition plate 13 on one side, and when the rotating disc 19 drives the first bevel gear 18 to rotate, the second bevel gear 30 drives the reciprocating lead screw 26 to rotate, and in the process of rotating of the reciprocating lead screw 26, the partition plate 13 first moves to the outside of the cylinder body 2 and then moves to the center of the cylinder body 2.

[0048] The top plate of the cylinder body 2 above the second cavity 16 is provided with a first mounting sleeve 201, and the lower end of the first mounting sleeve 201 is in sealing contact with the upper end of the membrane assembly 14 in the second cavity 16. The top plate of the cylinder body 2 above the third cavity 17 is provided with a second mounting sleeve 202, the first mounting sleeve 201 is in communication with the stock solution tank 5, the lower end of the second cavity 16 is in communication with the filtrate tank 6, the filtrate tank 6 is in communication with the second mounting sleeve 202, and the lower end of the third cavity 17 is in communication with the stock solution tank 5.

[0049] The bracket 7 is fixed on one side of the bracket 9, and the stock solution tank 5 and the filtrate tank 6 are fixed on the bracket 7. The stock solution tank 5 is provided with an inlet pipe and an outlet pipe.

[0050] The outlet end of the raw liquid tank 5 is communicated with the first mounting sleeve 201 through the first hose 3, and the lower end of the second cavity 16 is communicated with the filtrate tank 6 through the first soft drain pipe 28. The outlet end of the filtrate tank 6 is communicated with the second mounting sleeve 202 through the second hose 4, and the lower end of the third cavity 17 is communicated with the raw liquid tank 5 through the second soft drain pipe 29.

[0051] The first water pump 10 is installed on the first hose 3, and the second water pump 11 is installed on the second hose 4.

[0052] The colorimetric monitor 12 is installed on the filtrate tank 6, and the colorimetric monitor 12 is electrically connected with the first motor 21 through the controller.

[0053] The first motor 21 is started, and the first motor 21 drives the rotating disc 19 and the supporting arm 19 to rotate. In the rotating process of the rotating disc 19, the rotating disc 19 drives the partition plate 13 to move to the outside of the cylinder 2 through the transmission assembly, and the partition plate 13 is positioned to the supporting arm 19 after moving to the outside of the cylinder 2. After the supporting arm 19 in the first cavity 15, the second cavity 16 and the third cavity 17 is exchanged, the partition plate 13 is driven to move to the center of the cylinder 2 through the transmission assembly in the subsequent rotating process of the rotating disc 19. After the partition plate 13 is in sealing contact with the outer edge of the inner tube 22 and the outer edge of the rotating disc 19 towards the axis of the cylinder 2, the supporting arm 19 in the first cavity 15, the second cavity 16 and the third cavity 17 is completed to exchange, and the first cavity 15, the second cavity 16 and the third cavity 17 are independent of each other again.

[0054] The first bevel gear 18 drives the three second bevel gears 30 to rotate simultaneously when the rotating disc 19 rotates, and the second bevel gears 30 drive the reciprocating lead screw 26 connected therewith to rotate. The reciprocating lead screw 26 drives the partition plate 13 connected therewith to move along the radial direction of the cylinder 2 when the reciprocating lead screw 26 rotates. The partition plate 13 moves to the outside of the cylinder 2 first and then moves to the center of the cylinder 2 in the rotating process of the reciprocating lead screw 26. The partition plate 13 can be positioned to the supporting arm 19 after moving to the outside of the cylinder 2.

[0055] The door plate 1 is opened, and the two membrane assemblies 14 are installed on the adjacent two supporting arms 19 respectively, and the two supporting arms 19 installed with the membrane assemblies 14 are located in the first cavity 15 and the second cavity 16 respectively. At this time, the third cavity 17 is without the membrane assembly 14, and the upper end of the membrane assembly 14 in the second cavity 16 is in sealing contact and communication with the first mounting sleeve 201.

[0056] Start the first water pump 10 and the second water pump 11, the raw liquid in the raw liquid tank 5 is filtered to form the filtrate after entering into the membrane module 14 in the second cavity 16 through the first hose 3 and the first mounting sleeve 201, the filtrate enters into the filtrate tank 6 through the first soft drain pipe 28, the filtrate in the filtrate tank 6 enters into the third cavity 17 through the second hose 4 and the second mounting sleeve 202, and the filtrate in the third cavity 17 flows back to the raw liquid tank 5 through the second soft drain pipe 29.

[0057] When the data of the colorimeter 12 does not change for a long time, the membrane module 14 in the second cavity 16 is damaged.

[0058] When the membrane module 14 in the second cavity 16 is damaged, the rotating disc 19 is rotated, the membrane module 14 in the second cavity 16 moves to the third cavity 17, and the membrane module 14 in the first cavity 15 enters the second cavity 16. At this time, there is no membrane module 14 on the first cavity 15, the door plate 1 is opened, and the membrane module 14 is installed on the arm 19 of the first cavity 15. At this time, the three arms 19 all have the membrane module 14, and the damaged membrane module 14 is located in the third cavity 17.

[0059] When the raw liquid in the raw liquid tank 5 is processed, the membrane module 14 in the second cavity 16 filters the raw liquid, the filtrate enters the filtrate tank 6, and then enters the third cavity 17 through the second mounting sleeve 202 and washes the damaged membrane module 14 in the third cavity 17. The filtrate washed to the damaged membrane module 14 flows back to the raw liquid tank 5 and is filtered by the membrane module 14 in the second cavity 16.

[0060] When the damaged membrane module 14 in the third cavity 17 is washed, the cylinder 2 is vibrated up and down by the vibration assembly, which can improve the washing effect of the damaged membrane module 14.

[0061] When the membrane module 14 in the second cavity 16 is damaged, the system has two damaged membrane modules 14 in this state, and they are located in the second cavity 16 and the third cavity 17 respectively, and the damaged membrane module 14 in the third cavity 17 has been washed clean.

[0062] Then start the first motor 21 to rotate the rotating disc 19, when the washed damaged membrane module 14 enters the first cavity 15, the washed damaged membrane module 14 can be removed for maintenance, and after the washed damaged membrane module 14 is removed, a new membrane module 14 is installed on the arm 19 in the first cavity 15.

[0063] In the system, the membrane assembly 14 in the second cavity 16 filters the raw solution, the damaged membrane assembly 14 is transferred to the third cavity 17 to be flushed, and the flushed membrane assembly 14 is moved to the first cavity 15 to be replaced, so that the membrane assembly 14 is used in stages and managed in the whole life cycle.

[0064] The above merely provides the preferred embodiments of the application, and is not intended to limit the application. Any modification, equivalent replacement, and improvement made within the spirit and principle of the application shall fall within the protection scope of the application.

Claims

1. A nanofiltration membrane system comprising a cylinder (2), one side of the cylinder (2) is detachably fixed and sealingly connected with a door plate (1), characterized in that, The bracket (9) is fixed with a support (7), the raw liquid tank (5) and the filtrate tank (6) are fixed on the support (7), and the raw liquid tank (5) is provided with an inlet pipe and an outlet pipe.

2. The nanofiltration membrane system of claim 1, wherein, The vibration assembly comprises a connecting frame (8) fixed at the lower end of the cylinder body (2), the connecting frame (8) penetrates the bracket (9), the connecting frame (8) is slidably connected with the bracket (9), the connecting frame (8) can slide in the vertical direction of the bracket (9), the bracket (9) is fixed with a supporting block (27), the supporting block (27) limits the lower end of the connecting frame (8), the bracket (9) is fixed with a second motor (23), the output shaft of the second motor (23) is fixed with a cam (24), and the working surface of the cam (24) is in contact with the lower end of the connecting frame (8).

3. The nanofiltration membrane system of claim 1, wherein, The upper and lower ends of the partition plate (13) are slidably and sealingly connected with the top plate and the bottom plate of the cylinder body (2), and one end of the partition plate (13) towards the shaft center of the cylinder body (2) is sealingly in contact with the outer edge of the inner tube (22) and the outer edge of the rotating disc (19).

4. The nanofiltration membrane system of claim 1, wherein, The upper and lower ends of the partition plate (13) are slidably and sealingly connected with the top plate and the bottom plate of the cylinder body (2), and one end of the partition plate (13) towards the shaft center of the cylinder body (2) is sealingly in contact with the outer edge of the inner tube (22) and the outer edge of the rotating disc (19).

5. The nanofiltration membrane system of claim 1, wherein, The outlet end of the stock solution tank (5) is communicated with the first mounting sleeve (201) through the first hose (3), the lower end of the second cavity (16) is communicated with the filtrate tank (6) through the first soft drain pipe (28), the outlet end of the filtrate tank (6) is communicated with the second mounting sleeve (202) through the second hose (4), the lower end of the third cavity (17) is communicated with the stock solution tank (5) through the second soft drain pipe (29), the first water pump (10) is mounted on the first hose (3), the second water pump (11) is mounted on the second hose (4), the colorimetric monitor (12) is mounted on the filtrate tank (6), and the colorimetric monitor (12) is electrically connected with the first motor (21) through the controller.

6. The nanofiltration membrane system of claim 1, wherein, The transmission assembly comprises a first bevel gear (18), the first bevel gear (18) is fixedly connected with the rotating disc (19) in a concentric manner, the inner tube (22) is rotatably connected with a second bevel gear (30) corresponding to the partition plate (13), the first bevel gear (18) is engaged with the second bevel gear (30), the rotating shaft of the second bevel gear (30) is fixedly connected with the reciprocating lead screw (26) in a concentric manner, the reciprocating lead screw (26) is sleeved with the sleeve (25) outside, the sleeve (25), the reciprocating lead screw (26) and the ball in the sleeve (25) constitute a reciprocating lead screw pair, the sleeve (25) is fixedly connected with the partition plate (13) on one side, when the rotating disc (19) drives the first bevel gear (18) to rotate, the second bevel gear (30) drives the reciprocating lead screw (26) to rotate, and the partition plate (13) moves to the outer side of the barrel (2) first and then moves to the center of the barrel (2) in the rotating process of the reciprocating lead screw (26).

7. The nanofiltration membrane system of claim 1, wherein, The square hole (20) is formed in the support arm (19), the lower end of the membrane assembly (14) is fixedly connected with a square block, and the square block is detachably fixedly installed in the square hole (20).

8. The nanofiltration membrane system of claim 1, wherein, The door plate (1) corresponds to the first cavity (15).

9. Use of a nanofiltration membrane system according to claim 1, characterized in that The first motor (21) is started, the first motor (21) drives the rotating disc (19) and the support arm (19) to rotate, in the rotating process of the rotating disc (19), the rotating disc (19) drives the partition plate (13) to move to the outer side of the barrel (2) first through the transmission assembly, the partition plate (13) is positioned to the support arm (19) after moving to the outer side of the barrel (2), the support arm (19) in the first cavity (15), the second cavity (16) and the third cavity (17) is exchanged, the partition plate (13) moves to the center of the barrel (2) through the transmission assembly in the subsequent rotating process of the rotating disc (19), the end of the partition plate (13) towards the shaft center of the barrel (2) is in sealing contact with the outer edge of the inner tube (22) and the outer edge of the rotating disc (19), and the support arm (19) in the first cavity (15), the second cavity (16) and the third cavity (17) is completed exchange; The door plate (1) is opened, the two membrane assemblies (14) are installed on two adjacent support arms (19) respectively, and the two support arms (19) provided with the membrane assemblies (14) are located in the first cavity (15) and the second cavity (16) respectively, at this time, the third cavity (17) is not provided with the membrane assembly (14), and the upper end of the membrane assembly (14) in the second cavity (16) is in sealing contact with and communicated with the first mounting sleeve (201). The raw solution in the raw solution tank (5) is filtered to form filtrate after entering the membrane assembly (14) in the second cavity (16) through the first mounting sleeve (201), and the filtrate enters the filtrate tank (6). The filtrate in the filtrate tank (6) enters the third cavity (17) after passing through the second mounting sleeve (202), and the filtrate in the third cavity (17) flows back to the raw solution tank (5) again; When the membrane assembly (14) in the second cavity (16) is damaged, the rotating disc (19) is rotated, the membrane assembly (14) in the second cavity (16) is moved to the third cavity (17), and the membrane assembly (14) in the first cavity (15) enters the second cavity (16). At this time, the first cavity (15) does not have a membrane assembly (14) on the arm (19), the door plate (1) is opened, and the membrane assembly (14) is installed on the arm (19) of the first cavity (15). At this time, the three arms (19) all have membrane assemblies (14), and the damaged membrane assembly (14) is located in the third cavity (17); When the raw solution in the raw solution tank (5) is processed subsequently, the membrane assembly (14) in the second cavity (16) filters the raw solution, the filtrate enters the filtrate tank (6), passes through the second mounting sleeve (202) and enters the third cavity (17), and washes the damaged membrane assembly (14) in the third cavity (17). The filtrate washed on the damaged membrane assembly (14) flows back to the raw solution tank (5) and is filtered by the membrane assembly (14) in the second cavity (16) again; When the damaged membrane assembly (14) in the third cavity (17) is washed, the cylinder (2) is vibrated up and down by the vibration assembly, which can improve the washing effect of the damaged membrane assembly (14); When the membrane assembly (14) in the second cavity (16) is damaged, the system has two damaged membrane assemblies (14) in this state, and they are located in the second cavity (16) and the third cavity (17) respectively. The damaged membrane assembly (14) in the third cavity (17) has been washed clean; Then start the first motor (21) to make the rotating disc (19) rotate, when the washed damaged membrane assembly (14) enters the first cavity (15), the washed damaged membrane assembly (14) can be removed for maintenance. After the washed damaged membrane assembly (14) is removed, a new membrane assembly (14) is installed on the arm (19) in the first cavity (15); In the system, the membrane assembly (14) in the second cavity (16) filters the raw solution, the damaged membrane assembly (14) is transferred to the third cavity (17) and is washed, and the washed membrane assembly (14) is moved to the first cavity (15) and replaced.

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