A discontinuous hydrophilic modification device for polytetrafluoroethylene hollow fiber membrane

Abstract

The present invention relates to the technical field of modification of polytetrafluoroethylene hollow fiber membrane filaments, and the present invention discloses a discontinuous hydrophilic modification device for polytetrafluoroethylene hollow fiber membrane filaments, including a modification unit, wherein the modification unit includes a modification tank, a bracket arranged below the modification tank, a tank cover assembly fixedly installed above the modification tank, and two electric slide rails symmetrically arranged at the bottom of the modification tank; a cleaning unit, wherein the cleaning unit includes a bearing assembly arranged at the inner circle of the modification tank, a plurality of first water spray assemblies uniformly fixed to the inner circle of the bearing assembly, a water delivery pipe fixed to the top of the bearing assembly, a plurality of second water spray assemblies uniformly installed at the bottom of the bearing assembly, and a control assembly arranged inside the bearing assembly. The beneficial effect of the present invention is that through the cooperation of the electric slide rail and the cleaning unit, the polytetrafluoroethylene hollow fiber membrane filaments placed inside the modification tank and the inner wall of the modification tank can be cleaned, and the cleaning efficiency can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of polytetrafluoroethylene hollow fiber membrane modification, in particular to a polytetrafluoroethylene hollow fiber membrane discontinuous hydrophilic modification device. Background Art

[0002] Polytetrafluoroethylene hollow fiber membranes are widely used in the fields of chemical industry, textile, environment, food, etc. due to their stable chemical properties, high temperature resistance, acid and alkali resistance, etc. However, due to the strong hydrophobicity and extremely low surface energy of PTFE materials, polytetrafluoroethylene hollow fiber membranes have poor wettability and are difficult to handle aqueous solutions, which limits their application. Therefore, in order to further expand its application range, polytetrafluoroethylene hollow fiber membranes must be hydrophilized.

[0003] Generally, traditional intermittent hydrophilic modification requires the use of multiple tanks to hold different soaking hydrophilic modification liquids or cleaning water, and then modify and clean the cut membrane filaments according to the process. Or soak in different liquids in one tank in turn, clean after soaking, and then change the liquid for soaking. The operation is cumbersome and the degree of automation is low. If multiple tanks are used, the membrane filaments need to be transported.

[0004] Improvements made to this tank mainly achieve the following functions or solve the following technical problems:

[0005] (1) Different modification processes are implemented on one tank according to the process flow, reducing the use of multiple tanks to hold different modification liquids. This method can solve the problems of the existing modification equipment, such as large equipment, large floor space, rotating transportation of membrane filaments, complex operation, high labor requirements, and low degree of automation.

[0006] (2) Improvements to the cleaning device in the equipment solve the problems of heavy cleaning workload and low work efficiency. Summary of the invention

[0007] Some simplifications or omissions may be made in this section and the abstract and title of the present application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0008] The purpose of the present invention is to provide a device for discontinuous hydrophilic modification of polytetrafluoroethylene hollow fiber membrane fibers, which can solve the problems of inconvenience in hydrophilic modification of polytetrafluoroethylene hollow fiber membrane fibers and inconvenience in cleaning the inner wall of the hydrophilic modification tank of the polytetrafluoroethylene hollow fiber membrane fibers and the residual liquid on the surface of the polytetrafluoroethylene hollow fiber membrane fibers.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions: a polytetrafluoroethylene hollow fiber membrane discontinuous hydrophilic modification device, which includes a modification unit, the modification unit includes a modification tank, a bracket arranged below the modification tank, a tank cover assembly fixedly installed above the modification tank, and two electric slide rails symmetrically arranged at the bottom of the modification tank;

[0010] The cleaning unit includes a bearing assembly arranged on the inner circle of the modified tank, a plurality of first water spray assemblies uniformly fixed on the inner circle of the bearing assembly, a water pipe fixed on the top of the bearing assembly, a plurality of second water spray assemblies uniformly installed on the bottom of the bearing assembly, and a control assembly arranged inside the bearing assembly, wherein the control assembly is matched with the first water spray assembly and the second water spray assembly.

[0011] As a preferred embodiment of the intermittent hydrophilic modification device of the polytetrafluoroethylene hollow fiber membrane fibers described in the present invention, the outer ring of the modification tank at the top is evenly and fixedly connected with the first feed port, the second feed port and the third feed port, the bottom of the modification tank is fixedly connected with the first discharge port, the second discharge port and the third discharge port, and one side of the second discharge port and the third discharge port is respectively fixedly connected with the first waste liquid outlet and the second waste liquid outlet.

[0012] As a preferred solution of the intermittent hydrophilic modification device of polytetrafluoroethylene hollow fiber membrane fibers described in the present invention, the tank cover assembly includes a cover plate, a pressure pipe and a water inlet pipe fixed above the cover plate, and a pressure gauge arranged on the pressure pipe, the cover plate is engaged with the top of the modification tank, and a hot air gun is penetrated through the cover plate.

[0013] As a preferred solution of the intermittent hydrophilic modification device of the polytetrafluoroethylene hollow fiber membrane fibers described in the present invention, the electric slide rail is fixed to the bottom of the modification tank, and part of the electric slide rail passes through the bottom of the modification tank and enters the interior of the modification tank, and the electric slide rail is fixedly connected to the inner wall of the modification tank.

[0014] As a preferred solution of the intermittent hydrophilic modification device of the polytetrafluoroethylene hollow fiber membrane fibers described in the present invention, the supporting assembly includes a supporting ring arranged inside the modification tank, two slides symmetrically fixed to the outer ring of the supporting ring, and an annular through groove and multiple water outlet holes opened at the bottom of the supporting ring, the slide is slidably matched with the electric slide rail, the number of the water outlet holes is the same as the number of the second water spray assembly, and the water supply pipe is connected to the water inlet pipe through a telescopic pipe.

[0015] As a preferred solution of the intermittent hydrophilic modification device of the polytetrafluoroethylene hollow fiber membrane fibers described in the present invention, wherein: the first water spray assembly includes a water spray part and an adjusting part arranged on one side of the water spray part, the water spray part includes a first nozzle fixed to the inner ring of the supporting ring, two slide grooves symmetrically fixed to the inner ring of the first nozzle, and a first baffle fixed to the inner ring of the first nozzle.

[0016] As a preferred solution of the intermittent hydrophilic modification device of the polytetrafluoroethylene hollow fiber membrane fibers described in the present invention, the adjusting member includes a cylinder sliding in the first nozzle, a circular plate and a second baffle respectively fixed at both ends of the cylinder, two sliding strips fixed to the outer ring of the cylinder, and a spring arranged on the outer ring of the cylinder.

[0017] As a preferred solution of the intermittent hydrophilic modification device for polytetrafluoroethylene hollow fiber membrane fibers described in the present invention, the second baffle is adapted to the first baffle, the slide bar is slidably matched with the slide groove, and the two ends of the spring are respectively fixed to one side of the circular plate and the inner wall of the supporting ring.

[0018] As a preferred solution of the intermittent hydrophilic modification device of the polytetrafluoroethylene hollow fiber membrane described in the present invention, the second water spray assembly includes a second nozzle rotating at the bottom of the supporting ring, a first connecting plate fixed to one side of the second nozzle and a circular ring fixed to the bottom of the supporting ring, the second nozzle is connected to the interior of the supporting assembly through a water outlet, a placement groove is opened in the circular ring, a torsion spring is arranged in the placement groove, and the two ends of the torsion spring are respectively fixed to the side wall of the placement groove and the outer ring of the second nozzle.

[0019] As a preferred solution of the intermittent hydrophilic modification device of polytetrafluoroethylene hollow fiber membrane fibers described in the present invention, the control component includes a control ring rotating inside a carrying ring, a power plate evenly fixed to the outer ring of the control ring, a first opening and a second opening opened on the control ring, and two pressure plates fixed to the inner ring of the control ring, the two pressure plates are respectively located above and below the second opening, the pressure plate is slidably matched with the circular plate, the bottom of the control ring passes through an annular groove, and the control ring and the annular groove are rotatably connected through a sealing bearing ring, and the outer ring of the control ring is fixedly connected with a plurality of second connecting plates, and the second connecting plates are used in conjunction with the first connecting plates.

[0020] Beneficial effects of the present invention: The present invention cooperates with the electric slide rail and the cleaning unit, and the water flowing in from the water pipe impacts the control component to rotate the control component. The rotation of the control component can control the water outlet pressure of the first water spray component and the cleaning range of the second water spray component, so as to clean the polytetrafluoroethylene hollow fiber membrane filaments placed in the modified tank and the inner wall of the modified tank, and effectively improve the cleaning efficiency. At the same time, through the change of the water outlet pressure of the first water spray component and the cleaning range of the second water spray component, the polytetrafluoroethylene hollow fiber membrane filaments and the inner wall of the modified tank can be completely cleaned. At the same time, through the setting of the modified tank, the problem of traditional transportation of polytetrafluoroethylene hollow fiber membrane filaments can be avoided, which greatly facilitates the operation of hydrophilic modification thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0022] Figure 1 It is a schematic diagram of the structure of a discontinuous hydrophilic modification device for polytetrafluoroethylene hollow fiber membranes.

[0023] Figure 2 It is a schematic diagram of the structure of the cleaning unit.

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the cleaning unit.

[0025] Figure 4 It is a schematic diagram of the cross-sectional structure of the load-bearing component.

[0026] Figure 5 for Figure 4 Enlarged structural diagram at A in the middle.

[0027] Figure 6 It is a structural schematic diagram of the adjusting part.

[0028] Figure 7 It is a structural schematic diagram of the second water spray assembly.

[0029] Figure 8 A schematic diagram of the control component. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0033] Example 1

[0034] Reference Figures 1 to 8 , which is the first embodiment of the present invention, and provides a polytetrafluoroethylene hollow fiber membrane intermittent hydrophilic modification device, which includes a modification unit 100, the modification unit 100 includes a modification tank 101, a bracket 102 arranged below the modification tank 101, a tank cover assembly 103 fixedly installed above the modification tank 101, and two electric slide rails 104 symmetrically arranged at the bottom of the modification tank 101; a cleaning unit 200, the cleaning unit 200 includes a bearing assembly 201 arranged at the inner circle of the modification tank 101, a plurality of first water spray assemblies 202 uniformly fixed to the inner circle of the bearing assembly 201, a water pipe 203 fixed to the top of the bearing assembly 201, a plurality of second water spray assemblies 204 uniformly installed at the bottom of the bearing assembly 201, and a control assembly 205 arranged inside the bearing assembly 201, and the control assembly 205 is used in combination with the first water spray assembly 202 and the second water spray assembly 204.

[0035] When in use, the modification unit 100 can be used to make the polytetrafluoroethylene hollow fiber membrane filaments hydrophilic, and the electric slide rail 104 can drive the cleaning unit 200 to move so that the polytetrafluoroethylene hollow fiber membrane filaments and the inner wall of the modification tank 101 can be completely cleaned. Through the cooperation of the second water spray component 204, the first water spray component 202 and the control component 205, the water pressure of the first water spray component 202 can be changed to spray water streams of different lengths, so as to clean the polytetrafluoroethylene hollow fiber membrane filaments and prevent the damage of the polytetrafluoroethylene hollow fiber membrane filaments caused by cleaning the polytetrafluoroethylene hollow fiber membrane filaments with one water pressure. At the same time, the spray range of the second water spray component 204 can be adjusted by the control component 205 so that the inner wall of the modification tank 101 can be completely cleaned.

[0036] Example 2

[0037] Reference Figure 1, which is the second embodiment of the present invention, and is different from the first embodiment in that: it also includes a first feed port 101a, a second feed port 101b and a third feed port 101c uniformly and fixedly connected to the outer ring of the modification tank 101 at the top, a first discharge port 101d, a second discharge port 101e and a third discharge port 101f fixedly connected to the bottom of the modification tank 101, and a first waste liquid outlet 101e-1 and a second waste liquid outlet 101f-1 are fixedly connected to one side of the second discharge port 101e and the third discharge port 101f, respectively.

[0038] The first feed port 101a and the first discharge port 101d are both connected to a first storage tank containing anhydrous ethanol, the second feed port 101b and the second discharge port 101e are both connected to a second storage tank containing a PVA-PVP mixed solution with a mass ratio of 4:1 and a PVA mass concentration of 0.5%wt, the third feed port 101c and the third discharge port 101f are both connected to a third storage tank containing a 5% acidic glutaraldehyde solution, and the first waste liquid outlet 101e-1 and the second waste liquid outlet 101f-1 are connected to the waste liquid tank, so as to place different liquids in the modification tank 101 and discharge the liquids, and the wastewater after cleaning the modification tank 101 and the polytetrafluoroethylene hollow fiber membrane fibers can be discharged through the first waste liquid outlet 101e-1 and the second waste liquid outlet 101f-1.

[0039] Specifically, the tank cover assembly 103 includes a cover plate 103a, a pressure tube 103b and a water inlet pipe 103c fixed above the cover plate 103a, and a pressure gauge 103d arranged on the pressure tube 103b. The cover plate 103a is engaged with the top of the modified tank 101, and a hot air gun 103e is arranged through the cover plate 103a.

[0040] The pressure tube 103b is connected to an external pressurizing device, and can pressurize the modification tank 101, so that when the polytetrafluoroethylene hollow fiber membrane filaments are immersed in liquid, the inside of the polytetrafluoroethylene hollow fiber membrane filaments can also be hydrophilically modified by pressurizing, which can effectively prevent the liquid from being unable to modify the inside of the polytetrafluoroethylene hollow fiber membrane filaments. The pressure in the modification tank 101 can be observed at any time through the pressure gauge 103d, and the cleaned polytetrafluoroethylene hollow fiber membrane filaments can be dried through the setting of the hot air gun 103e. Clean water can be input into the supporting ring 201a through the water inlet pipe 103c to clean the modification tank 101 and the polytetrafluoroethylene hollow fiber membrane filaments.

[0041] Furthermore, the cover plate 103a is snap-connected with the modification tank 101, and a sealing gasket is provided at the connection, which can ensure the sealing effect of the connection between the two and ensure stable pressurization of the modification tank 101 through the pressure pipe 103b.

[0042] Specifically, the electric slide rail 104 is fixed to the bottom of the modified tank 101, and part of the electric slide rail 104 passes through the bottom of the modified tank 101 and enters the interior of the modified tank 101. The electric slide rail 104 is fixedly connected to the inner wall of the modified tank 101. Through the action of the electric slide rail 104, the cleaning unit 200 can be moved and provided with power.

[0043] When in use, the PTFE hollow fiber membrane is placed in the modification tank 101, the cover plate 103a is covered on the top of the modification tank 101, and then the first feed port 101a is opened, and anhydrous ethanol enters the modification tank 101. When the anhydrous ethanol covers the membrane fibers, the first feed port 101a is closed, and the membrane fibers are soaked for 0.5h; the first discharge port 101d is opened, and the anhydrous ethanol is refluxed into the first storage tank, and the first discharge port 101d is closed; the second feed port 101b is opened, and the PVA-PVP mixed solution enters the modification tank 1 01, the membrane filaments are submerged, the second feed port 101b is closed, the pressure tube 103b is opened, and the pressure in the modification tank 101 is adjusted to 10kpa through the pressure gauge 103d for observation, the membrane filaments are immersed for 0.5h, and the pressure tube 103b is closed; the second discharge port 101e is opened to return the feed liquid to the second storage tank; the water inlet pipe 103c is opened to supply water to the carrying ring 201a, and the interior of the modification tank 101 and the polytetrafluoroethylene hollow fiber membrane filaments are cleaned by the cooperation of the electric slide rail 104 and the cleaning unit 200. Cleaning is carried out. The cleaning time can be set according to the cleaning situation of the device. Close the water inlet pipe 103c; open the first waste liquid outlet 101e-1, drain the waste liquid, and close the first waste liquid outlet 101e-1; open the third feed inlet 101c, and the glutaraldehyde acid solution enters the modification tank 101 and covers the membrane filaments. Close the third feed inlet 101c, open the pressure tube 103b, and observe through the pressure gauge 103d. Adjust the pressure in the modification tank 101 to 10kpa, soak the membrane filaments for 0.5h, and close the pressure tube 103b; open the second discharge port 101e to return the slurry to the second storage tank; open the water inlet pipe 103c to supply water to the supporting ring 201a, and clean the interior of the modification tank 101 and the polytetrafluoroethylene hollow fiber membrane filaments through the cooperation of the electric slide rail 104 and the cleaning unit 200. The cleaning time can be set according to the cleaning situation of the device, and close the water inlet pipe 103c; turn on the hot air gun 103e, heat the interior of the modification tank 101 to 40 degrees, dry the membrane filaments, and then take them out to complete the modification.

[0044] Example 3

[0045] Reference Figure 2 to Figure 8, which is the third embodiment of the present invention, and is based on the previous two embodiments. This embodiment also includes a bearing assembly 201 including a bearing ring 201a arranged inside the modified tank 101, two slides 201b symmetrically fixed to the outer ring of the bearing ring 201a, and an annular groove 201c and a plurality of water outlet holes 201d opened at the bottom of the bearing ring 201a. The slide 201b is slidably matched with the electric slide rail 104, the number of the water outlet holes 201d is the same as the number of the second water spray assembly 204, and the water pipe 203 is connected to the water inlet pipe 103c through a telescopic pipe.

[0046] The slide seat 201b is configured to achieve sliding cooperation with the electric slide rail 104, and the electric slide rail 104 can complete the movement of the supporting ring 201a. The annular groove 201c can provide conditions for the placement of the control component 205, so that the control component 205 can control the second water spray component 204.

[0047] Specifically, the first water spray assembly 202 includes a water spray component 202a and an adjusting component 202b arranged on one side of the water spray component 202a, the water spray component 202a includes a first nozzle 202a-1 fixed to the inner ring of the supporting ring 201a, two slide grooves 202a-2 symmetrically fixed to the inner ring of the first nozzle 202a-1, and a first baffle 202a-3 fixed to the inner ring of the first nozzle 202a-1.

[0048] Furthermore, the adjusting member 202b includes a cylinder 202b-1 sliding in the first nozzle 202a-1, a circular plate 202b-3 and a second baffle 202b-5 respectively fixed at both ends of the cylinder 202b-1, two sliding strips 202b-2 fixed to the outer ring of the cylinder 202b-1, and a spring 202b-4 arranged on the outer ring of the cylinder 202b-1.

[0049] Furthermore, the second baffle 202b-5 is adapted to the first baffle 202a-3, the slide bar 202b-2 is slidably matched with the slide groove 202a-2, and both ends of the spring 202b-4 are respectively fixed to one side of the circular plate 202b-3 and the inner wall of the bearing ring 201a.

[0050] By sliding the cylinder 202b-1 inside the first nozzle 202a-1, the cooperation between the slide bar 202b-2 and the slide groove 202a-2 can realize the limit of the movement of the cylinder 202b-1, and the cylinder 202b-1 is placed to rotate during the movement, resulting in the position relationship between the second baffle 202b-5 and the first baffle 202a-3 not corresponding to each other, and the change of the water outlet pressure cannot be realized. When the second baffle 202b-5 contacts the first baffle 202a-3, the two cooperate to change the water outlet part in the first nozzle 202a-1 to only the circular hole in the middle after the second baffle 202b-5 contacts the first baffle 202a-3, and the size of the circular hole is The size of the spring 202b-4 is smaller than that of the original first nozzle 202a-1, so that the water sprayed from the first nozzle 202a-1 can be farther, and the membrane filaments in the center and the edge can be cleaned to prevent the internal membrane filaments from not being cleaned, which will cause problems in the subsequent hydrophilic modification experiment. Through the setting of the spring 202b-4, a thrust can be given to the circular plate 202b-3, and the cylinder 202b-1 can be pushed toward the outside of the first nozzle 202a-1, so that the circular plate 202b-3 can achieve sliding cooperation with the inner circle of the control circle 205a, and the side of the circular plate 202b-3 close to the inner circle of the control circle 205a is an arc surface setting, which can always be close to the inner circle of the control circle 205a.

[0051] Specifically, the second water spray assembly 204 includes a second nozzle 204a rotating at the bottom of the supporting ring 201a, a first connecting plate 204b fixed to one side of the second nozzle 204a, and a circular ring 204c fixed to the bottom of the supporting ring 201a. The second nozzle 204a is connected to the interior of the supporting assembly 201 through the water outlet 201d. A placement groove 204d is opened in the circular ring 204c, and a torsion spring 204e is arranged in the placement groove 204d. The two ends of the torsion spring 204e are respectively fixed to the side wall of the placement groove 204d and the outer ring of the second nozzle 204a.

[0052] Furthermore, the rotation of the second nozzle 204a and the carrying ring 201a is achieved through a sealed bearing, which can ensure the sealing effect of the rotating connection between the second nozzle 204a and the carrying ring 201a. At the same time, the first connecting plate 204b is configured to cooperate with the second connecting plate 205f to realize the rotation of the second nozzle 204a. Through the action of the torsion spring 204e, the second nozzle 204a can be given a rebound effect. When the second connecting plate 205f moves out of the range of the first connecting plate 204b, the torsion spring 204e can drive the second nozzle 204a to rotate back to its original position, thereby achieving a large-area cleaning of the inner wall of the modified tank 101.

[0053] Specifically, the control assembly 205 includes a control circle 205a rotating inside the carrying ring 201a, a power plate 205b evenly fixed on the outer ring of the control circle 205a, a first opening 205c and a second opening 205d opened on the control circle 205a, and two pressure plates 205e fixed on the inner ring of the control circle 205a, the two pressure plates 205e are respectively located above and below the second opening 205d, the pressure plate 205e is slidably matched with the circular plate 202b-3, the bottom of the control circle 205a passes through the annular groove 201c, and the control circle 205a is rotatably connected to the annular groove 201c through a sealing bearing ring, and the outer ring of the control circle 205a is fixedly connected with multiple second connecting plates 205f, and the second connecting plates 205f are used in conjunction with the first connecting plate 204b.

[0054] Furthermore, by setting up the water pipe 203, when the external water enters the inside of the supporting ring 201a, it can form a tendency to flow to one side. At the same time, through the action of the water flow, it can push the power plate 205b to move, realize the rotation of the control circle 205a, and thus realize the control of the first water spray assembly 202 and the second water spray assembly 204.

[0055] Furthermore, the widths of the first opening 205c and the second opening 205d are different. The width of the second opening 205d is the same as the inner ring size of the cylinder 202b-1, and the length of the second opening 205d is twice that of the first opening 205c. At the same time, half of the second opening 205d is fixed with pressure plates 205e on the upper and lower sides to ensure that the external water supply flow rate remains unchanged, which will cause three situations in the water flow: in the first situation, the second opening 205d is in contact with the circular plate 202b-3, and the water flow directly enters the first nozzle 202a-1 through the first opening 205c and the inner ring of the cylinder 202b-1 and is sprayed out; in the second situation, when the pressure plate 205e contacts 202d-3, it will drive the cylinder 202b-1 to move toward the first nozzle 202a-1, causing the second baffle 202b-5 to contact the first baffle 2 02a-3 is in contact, so that the water can only flow out from the circular hole formed by the two. Reducing the water flow space will increase the water pressure, thereby increasing the length of the water output longer than the first case; in the third case, when it rotates to the first opening 205c, the circular plate 202b-3 loses the squeezing of the pressure plate 205e, and the spring 202b-4 will drive the circular plate 202b-3 to fit with the inner wall of the control circle 205a, and transmit water to the first nozzle 202a-1 through the first opening 205c. The first opening 205c is narrow, and the amount of water input is less than that in the second case. At this time, the output water pressure will become greater, making the water spray farther. Through the three cases, membrane filaments at different levels can be cleaned, and at the same time, the membrane filaments can be protected by the change of water pressure, thereby avoiding damage to the membrane filaments caused by long-term high water pressure.

[0056] When in use, open the water inlet pipe 103c, and introduce water into the supporting ring 201a through the water inlet pipe 103c and the telescopic pipe, and form a circulation in the supporting ring 201a. The control circle 205a is driven to rotate by the cooperation of the water flow and the power plate 205b, and cooperates with the first water spray assembly 202 to clean the membrane filaments. The second nozzle 204a is rotated by the cooperation of the second connecting plate 205f and the first connecting plate 204b, so as to achieve a large-scale cleaning of the inner wall of the modified tank 101.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A polytetrafluoroethylene hollow fiber membrane discontinuous hydrophilic modification device, characterized in that: include, A modification unit (100), the modification unit (100) comprising a modification tank (101), a bracket (102) arranged below the modification tank (101), a tank cover assembly (103) fixedly mounted above the modification tank (101), and two electric slide rails (104) symmetrically arranged at the bottom of the modification tank (101); A cleaning unit (200), the cleaning unit (200) comprising a bearing assembly (201) arranged on the inner circle of a modification tank (101), a plurality of first water spray assemblies (202) uniformly fixed on the inner circle of the bearing assembly (201), a water delivery pipe (203) fixed on the top of the bearing assembly (201), a plurality of second water spray assemblies (204) uniformly installed on the bottom of the bearing assembly (201), and a control assembly (205) arranged inside the bearing assembly (201), wherein the control assembly (205) is used in conjunction with the first water spray assemblies (202) and the second water spray assemblies (204); The bearing assembly (201) comprises a bearing ring (201a) arranged inside the modification tank (101), two sliding seats (201b) symmetrically fixed to the outer ring of the bearing ring (201a), and an annular through groove (201c) and a plurality of water outlet holes (201d) opened at the bottom of the bearing ring (201a); The first water spraying assembly (202) comprises a water spraying member (202a) and an adjusting member (202b) arranged on one side of the water spraying member (202a); The adjusting member (202b) comprises a cylinder (202b-1) sliding in the first nozzle (202a-1), a circular plate (202b-3) and a second baffle (202b-5) respectively fixed to two ends of the cylinder (202b-1), two sliding bars (202b-2) fixed to the outer ring of the cylinder (202b-1), and a spring (202b-4) arranged on the outer ring of the cylinder (202b-1); The second water spray assembly (204) comprises a second spray head (204a) rotating at the bottom of the carrying ring (201a), a first connecting plate (204b) fixed to one side of the second spray head (204a), and a circular ring (204c) fixed to the bottom of the carrying ring (201a); the second spray head (204a) is connected to the inside of the carrying assembly (201) through a water outlet hole (201d); a placement groove (204d) is provided in the circular ring (204c); a torsion spring (204e) is provided in the placement groove (204d); two ends of the torsion spring (204e) are respectively fixed to the side wall of the placement groove (204d) and the outer ring of the second spray head (204a); The control assembly (205) comprises a control ring (205a) rotating inside a carrying ring (201a), a power plate (205b) uniformly fixed to the outer ring of the control ring (205a), a first opening (205c) and a second opening (205d) opened on the control ring (205a), and two pressure plates (205e) fixed to the inner ring of the control ring (205a), wherein the two pressure plates (205e) are respectively located above and below the second opening (205d), the pressure plates (205e) are slidably matched with the circular plate (202b-3), the bottom of the control ring (205a) passes through the annular groove (201c), and the control ring (205a) is rotatably connected to the annular groove (201c) via a sealing bearing ring, and the outer ring of the control ring (205a) is fixedly connected with a plurality of second connecting plates (205f), and the second connecting plates (205f) are used in conjunction with the first connecting plate (204b).

2. The device for discontinuous hydrophilic modification of polytetrafluoroethylene hollow fiber membranes according to claim 1, characterized in that: The outer ring of the modification tank (101) at the top is evenly and fixedly connected with a first feed port (101a), a second feed port (101b) and a third feed port (101c); the bottom of the modification tank (101) is fixedly connected with a first discharge port (101d), a second discharge port (101e) and a third discharge port (101f); and one side of the second discharge port (101e) and the third discharge port (101f) is fixedly connected with a first waste liquid outlet (101e-1) and a second waste liquid outlet (101f-1), respectively.

3. The device for discontinuous hydrophilic modification of polytetrafluoroethylene hollow fiber membranes according to claim 2, characterized in that: The tank cover assembly (103) comprises a cover plate (103a), a pressure pipe (103b) and a water inlet pipe (103c) fixed above the cover plate (103a), and a pressure gauge (103d) arranged on the pressure pipe (103b); the cover plate (103a) is engaged with the top of the modified tank (101); and a hot air gun (103e) is arranged through the cover plate (103a).

4. The device for discontinuous hydrophilic modification of polytetrafluoroethylene hollow fiber membranes according to claim 2 or 3, characterized in that: The electric slide rail (104) is fixed to the bottom of the modification tank (101), and part of the electric slide rail (104) passes through the bottom of the modification tank (101) and enters the interior of the modification tank (101), and the electric slide rail (104) is fixedly connected to the inner wall of the modification tank (101).

5. The device for discontinuous hydrophilic modification of polytetrafluoroethylene hollow fiber membranes according to claim 4, characterized in that: The slide seat (201b) is slidably matched with the electric slide rail (104); the number of the water outlet holes (201d) is the same as the number of the second water spray assembly (204); and the water delivery pipe (203) is connected to the water inlet pipe (103c) via a telescopic pipe.

6. The device for discontinuous hydrophilic modification of polytetrafluoroethylene hollow fiber membranes according to claim 5, characterized in that: The water spraying member (202a) comprises a first spray head (202a-1) fixed to the inner ring of the carrying ring (201a), two slide grooves (202a-2) symmetrically fixed to the inner ring of the first spray head (202a-1), and a first baffle (202a-3) fixed to the inner ring of the first spray head (202a-1).

7. The device for discontinuous hydrophilic modification of polytetrafluoroethylene hollow fiber membranes according to claim 6, characterized in that: The second baffle (202b-5) is adapted to the first baffle (202a-3), the slide bar (202b-2) is slidably matched to the slide groove (202a-2), and the two ends of the spring (202b-4) are respectively fixed to one side of the circular plate (202b-3) and the inner wall of the bearing ring (201a).

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