A device and method for detecting the hydrophilic property of a nanofilm

Abstract

A hydrophilicity detection device and method for a nanofilm, including a detection box. The detection box is in the shape of a flat cuboid. Inside the detection box, there are a pressurization area, a liquid addition area, a permeation area, and a drainage area from top to bottom in sequence. A pressurization air pump is connected to the side of the pressurization area, a water injection pipe is connected to the side of the liquid addition area, and a component to be detected is installed inside the permeation area; S1. Fabricate the component to be detected; S2. Install the component to be detected; S3. Hydrophilicity detection: The present invention can quickly and accurately measure the hydrophilicity of nanofibers. At the same time, by using bonding and the design of each backing plate, it can ensure that the nanofibers are in a stretched and taut state, thereby eliminating the influence of fiber bending on the detection accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of nano-film, and particularly relates to a detection device for the hydrophilic property of a nano-film. Background Art

[0002] The MBR nano-film sheet assembly is composed of multiple pvdf hollow fiber membranes. When treating sewage, small-molecule water passes through the nano-pores on the outer wall of the hollow fiber tube, and impurities are blocked and adsorbed on the hollow fiber tube, thus achieving purification; the material of the hollow fiber tube itself has certain hydrophilicity, and part of the water to be cleaned will be adsorbed by the hollow fiber. When producing the hollow fiber tube, it is necessary to detect whether the hydrophilicity is qualified to avoid excessive hydrophilicity.

[0003] During the current detection process, both ends of the hollow fiber tube will be clamped and positioned for installation, and during installation, the hollow fiber tube will also bend and fold. In this way, the hollow fiber cannot fully expand to absorb water, resulting in insufficient detection accuracy. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a detection device for the hydrophilic property of a nano-film, and the specific technical solution is as follows:

[0005] A detection device for the hydrophilic property of a nano-film includes a detection box, the detection box is in the shape of a flat cuboid, and the interior of the detection box is successively divided into a pressurization area, a liquid addition area, a permeation area, and a drainage area from top to bottom. A pressurization air pump is connected to the side of the pressurization area, a water injection pipe is connected to the side of the liquid addition area, the water injection pipe is used to quantitatively inject distilled water into the liquid addition area, the pressurization air pump is used to increase the air pressure in the detection box, a component to be detected is installed inside the permeation area, and a measurement component is installed at the bottom of the drainage area. The measurement component is used to detect the water output of the distilled water discharged from the drainage area; by judging whether the difference between the water injection volume and the water output volume is within the qualified hydrophilicity range, the hydrophilicity of the component to be detected can be determined.

[0006] Furthermore, the component to be detected includes an upper reserved positioning member, a hollow fiber group, and a lower reserved positioning member. The hollow fiber group is formed by successively bonding hollow fiber tubes in a linear array. The area between adjacent hollow fiber tubes is embedded with filling resin, and the filling resin is embedded at the top opening of each hollow fiber tube. The upper reserved positioning member is bonded to the outer wall of the top of the hollow fiber group, and the lower reserved positioning member is bonded to the outer wall of the bottom of the hollow fiber group. The upper reserved positioning member and the lower reserved positioning member are respectively fixed to the top and bottom of the permeation area.

[0007] Further, the upper reserved positioning members include a first backing plate and a second backing plate. The first backing plate and the second backing plate are symmetrically bonded to both sides of the top end of the hollow fiber group. A clamping cylinder is vertically provided on the outer wall of the detection box. Two upper support plates are slidably installed at the output end of the clamping cylinder. The two upper support plates are respectively inserted into the penetration area seamlessly from both sides of the detection box, and the two upper support plates respectively abut against the bottom surfaces of the first backing plate and the second backing plate.

[0008] Further, the structures of the first backing plate and the second backing plate are the same and both are rectangular plate structures. The first backing plate and the second backing plate are both attached to the inner wall of the detection box. The lengths of the first backing plate and the second backing plate are the same as the inner diameter of the detection box. The area between the first backing plate and the second backing plate except for the hollow fiber group is an opening, and the opening and the inner wall of the detection box enclose a water filling port. The water in the penetration area can only be injected through the water filling port.

[0009] Further, the lower reserved positioning members include a third backing plate and a fourth backing plate. The third backing plate and the fourth backing plate are symmetrically bonded to both sides of the bottom end of the hollow fiber group. A lower clamping cylinder is vertically provided on the outer wall of the detection box. Two lower support plates are slidably installed at the output end of the lower clamping cylinder. The two lower support plates are respectively inserted into the penetration area seamlessly from both sides of the detection box, and the two lower support plates respectively abut against the top surfaces of the third backing plate and the fourth backing plate.

[0010] Further, the structures of the third backing plate and the fourth backing plate are the same and both are U-shaped. The third backing plate, the fourth backing plate and the hollow fiber group are assembled in seamless fit. The third backing plate and the fourth backing plate are both attached to the inner wall of the detection box. The lengths of the third backing plate and the fourth backing plate are the same as the inner diameter of the detection box. The water discharged from the penetration area can only be discharged through the bottom opening of the hollow fiber group.

[0011] A method for detecting the hydrophilic property of a nano-film, the detection method comprising the following steps:

[0012] S1. Fabricate the component to be detected:

[0013] Manufacturing the upper reserved positioning part: Embed the first backing plate into the lower template of the backing plate installation mold. A first groove is provided at the center of the surface of the lower template, and a first backing plate with equal thickness is embedded inside the first groove. Side baffles are vertically provided at the outer ends of the surface of the lower template. An upper template is assembled and connected to the top of the lower template. A second groove is provided at the center of the upper template, and a second backing plate with equal thickness is embedded inside the second groove. Fill resin with a thickness of 6 - 10 mm is applied to the surfaces of the first backing plate and the second backing plate. Place the heads of multiple sampled hollow fiber tubes in a horizontal linear array one by one on the first backing plate. The part of the head of the hollow fiber tube extending outside the first backing plate abuts against the side baffle, and the first backing plate is bonded to the bottom surface of each hollow fiber tube through the fill resin. Invert the upper template on the top of the lower template. The side surface of the upper template fits against the inner wall of the side baffle, and the second backing plate is bonded to the top surface of each hollow fiber tube through the fill resin.

[0014] Manufacturing the lower reserved positioning part: Embed the third backing plate into the lower template of another set of backing plate installation molds. A fourth backing plate is embedded at the center of the other upper template. Fill resin with a thickness of 6 - 10 mm is applied to the surfaces of the third backing plate and the fourth backing plate. Place the tails of multiple hollow fiber tubes in a horizontal linear array one by one on the third backing plate. The part of the tail of the hollow fiber tube extending outside the third backing plate abuts against the side baffle, and the third backing plate is bonded to the bottom surface of each hollow fiber tube through the fill resin. Invert the other upper template on the top of the lower template. The side surface of the upper template fits against the inner wall of the side baffle, and the fourth backing plate is bonded to the top surface of each hollow fiber tube through the fill resin.

[0015] Fill the head opening of the hollow fiber bundle with epoxy resin.

[0016] Stationary the upper reserved positioning part, the lower reserved positioning part and the hollow fiber bundle, and use a cold air blower to dry the epoxy resin to obtain the component to be detected.

[0017] S2. Install the component to be detected:

[0018] Open the cover plate and place the component to be detected in the detection box.

[0019] Drive the lower clamping cylinder to move, so that the two lower baffles move inward to stop at the top of the lower reserved positioning part.

[0020] Gently lift the component to be detected upward with force. The lower reserved positioning part abuts against the lower baffle, and the hollow fiber bundle is in a taut state. Then drive the upper clamping cylinder to move, and the two upper supporting plates move to stop at the bottom of the upper reserved positioning part, so that the hollow fiber bundle remains in a taut state.

[0021] S3. Hydrophilicity detection:

[0022] Cover the cover plate, and inject distilled water into the water injection pipe to the liquid addition area, and the injection volume is G1.

[0023] The water in the liquid adding area is injected into the permeation area through the water adding port, and the hollow fiber group is immersed in distilled water;

[0024] The pressure air pump fills high-pressure gas into the pressurization area to increase the internal air pressure of the detection box

[0025] The distilled water passes through the nanopores on each hollow fiber tube and then enters the hollow fiber tube. The hollow fiber tube adsorbs part of the water under the action of hydrophilicity and finally gathers and flows out to the liquid discharge area;

[0026] After the permeation filtration is completed, the valve in the liquid discharge area is opened so that the filtered distilled water is discharged into the measuring assembly. The measuring assembly measures the water output as G2, and the difference between G1 and G2 is the water adsorbed by the hollow fiber group.

[0027] The beneficial effects of the present invention are: using the device and method of the present invention can quickly and accurately measure the hydrophilicity of nanofibers. At the same time, by using bonding and the design of each backing plate, it can ensure that the nanofibers are in a stretched and taut state, thereby eliminating the influence of fiber bending on the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Shows a schematic structural diagram of a nanofilm hydrophilicity detection device of the present invention;

[0029] Figure 2 Shows a schematic manufacturing structure diagram of a component to be detected of the present invention;

[0030] Figure 3 Shows a schematic structural diagram of a component to be detected of the present invention;

[0031] Figure 4 Shows a schematic installation structure diagram of an upper reserved positioning member and a detection box of the present invention;

[0032] Figure 5 Shows a schematic installation structure diagram of a lower reserved positioning member and a detection box of the present invention;

[0033] Figure 6 Shows a schematic manufacturing structure diagram of an upper reserved positioning member of the present invention;

[0034] Figure 7 Shows a schematic manufacturing structure diagram of a lower reserved positioning member of the present invention;

[0035] As shown in the figure: 1. Detection box; 11. Pressurization area; 12. Liquid addition area; 13. Penetration area; 14. Drainage area; 2. Pad mounting mold; 21. Upper template; 22. Lower template; 221. Side baffle; 3. Measuring assembly; 31. Measuring cylinder; 32. Weighing table; 4. Cover plate; 5. Component to be detected; 51. Upper reserved positioning part; 511. First pad; 512. Second pad; 513. Water filling port; 52. Hollow fiber group; 53. Lower reserved positioning part; 531. Third pad; 532. Fourth pad; 6. Upper clamping cylinder; 61. Upper support plate; 7. Lower clamping cylinder; 71. Lower baffle; 8. Pressurization air pump; 9. Water injection pipe. Detailed implementation mode

[0036] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention. Embodiment

[0037] A hydrophilic property detection device for a nanofilm includes a detection box 1. The detection box 1 is in the shape of a flat cuboid. Inside the detection box 1, there are successively from top to bottom a pressurization area 11, a liquid addition area 12, a penetration area 13, and a drainage area 14. Designing the inside of the detection box into multiple separate parts from top to bottom facilitates separate operations.

[0038] The side of the pressurization area 11 is connected to a pressurization air pump 8, and the side of the liquid addition area 12 is connected to a water injection pipe 9. The design of the pressurization air pump can increase the air pressure in the detection box, and distilled water can quickly penetrate into the hollow fiber tube under the action of external air pressure, thereby shortening the detection time and improving the detection efficiency.

[0039] The water injection pipe 9 is used to quantitatively inject distilled water into the liquid addition area 12. The design of the water injection pipe can avoid injecting water during the installation stage and inject water during the detection stage. Injecting distilled water can avoid impurities in the water affecting the measurement accuracy of the water volume.

[0040] Inside the penetration area 13, a component to be detected 5 is installed. At the bottom of the drainage area 14, a measuring assembly 3 is installed. The measuring assembly 3 is used to detect the amount of distilled water discharged from the drainage area 14. By judging whether the difference between the injected water volume and the discharged water volume is within the qualified hydrophilicity range, the hydrophilicity of the component to be detected can be determined. By calculating the difference between the injected water volume and the discharged water volume, the water absorption of the hollow fiber group can be measured. If the water absorption is high, the hydrophilicity is strong; if the water absorption is low, the hydrophilicity is weak.

[0041] Such asFigure 2 and Figure 3 As shown in Figure 3 , the component 5 to be detected includes an upper reserved positioning member 51, a hollow fiber group 52, and a lower reserved positioning member 53. The hollow fiber group 52 is formed by sequentially bonding hollow fiber tubes in a linear array. The area between adjacent hollow fiber tubes is embedded with filling resin, and the filling resin is embedded at the top opening of each hollow fiber tube. The upper reserved positioning member 51 is bonded to the outer wall of the top end of the hollow fiber group 52, and the lower reserved positioning member 53 is bonded to the outer wall of the bottom end. The upper reserved positioning member 51 and the lower reserved positioning member 53 are respectively fixed to the top end and the bottom end of the permeation area 13. The linear array of hollow fiber tubes is designed with only one row, which is convenient for bonding and positioning with the upper and lower reserved positioning members, and can more effectively eliminate the connection gap.

[0042] The filling resin can connect each middle tube fiber tube into one body to realize the positioning of the hollow fiber group, and will not compress the hollow fiber tubes. The top opening of the hollow fiber group is embedded with resin, which can prevent the water in the liquid addition area from entering through the top opening, and the water can only seep in from the side.

[0043] In order to facilitate the installation and positioning of the hollow fiber group in the detection box, the upper and lower reserved positioning members are designed for positioning. The filling resin can realize the positioning of the upper and lower reserved positioning members and the hollow fiber group, and will not press the ends of the hollow fiber tubes, so that the hollow fiber tubes will not be distorted or deformed, and the hollow fiber tubes can be in a taut and stretched state during detection. At the same time, the upper and lower reserved positioning members are made of lightweight plastic plates without a locking positioning structure. The bonding method of the filling resin can reduce the overall weight of the component to be detected, facilitate transfer and handling, and the positioning is simple.

[0044] As Figure 3 and Figure 4 shown in Figure 4 , the upper reserved positioning member 51 includes a first backing plate 511 and a second backing plate 512. The first backing plate 511 and the second backing plate 512 are symmetrically bonded to both sides of the top end of the hollow fiber group 52. The outer wall of the detection box 1 is vertically provided with an upper clamping cylinder 6. The output end of the upper clamping cylinder 6 is slidably installed with two upper support plates 61. The two upper support plates 61 are respectively inserted into the permeation area 13 from both sides of the detection box 1 seamlessly, and the two upper support plates 61 respectively abut against the bottom surfaces of the first backing plate 511 and the second backing plate 512. Designing the first backing plate and the second backing plate on both sides can realize the support and positioning on both sides. The upper clamping cylinder can drive the opening and closing action of the upper support plate, and then contract when putting in and extend when positioning.

[0045] As Figure 4As shown, the structures between the first backing plate 511 and the second backing plate 512 are the same and both are rectangular plate structures. The first backing plate 511 and the second backing plate 512 are both attached to the inner wall of the detection box 1. The lengths of the first backing plate 511 and the second backing plate 512 are the same as the inner diameter of the detection box 1. The area between the first backing plate 511 and the second backing plate 512 except for the hollow fiber group 52 is an opening, and the opening and the inner wall of the detection box 1 enclose a water filling port 513. The water in the permeation zone can only be injected through the water filling port. The design of the water filling port can facilitate the downward flow of water. The seamless insertion method can avoid water leakage, and a rubber gasket is designed at the connection to eliminate the gap.

[0046] As Figure 5 shown, the lower reserved positioning member 53 includes a third backing plate 531 and a fourth backing plate 532. The third backing plate 531 and the fourth backing plate 532 are symmetrically bonded to both sides of the bottom end of the hollow fiber group 52. A lower clamping cylinder 7 is vertically provided on the outer wall of the detection box 1. Two lower support plates 71 are slidably installed at the output end of the lower clamping cylinder 7. The two lower support plates 71 are respectively inserted into the permeation zone from both sides of the detection box 1 seamlessly, and the two lower support plates 71 respectively abut against the top surfaces of the third backing plate 531 and the fourth backing plate 532. The third backing plate and the fourth backing plate are fixed on both sides of the hollow fiber group. By using the lower clamping cylinder to drive the opening and closing action of the lower support plate, the lower reserved positioning member can be blocked from above.

[0047] As Figure 5 shown, the structures between the third backing plate 531 and the fourth backing plate 532 are the same and both are U-shaped. The third backing plate 531, the fourth backing plate 532 and the hollow fiber group 52 are assembled seamlessly and fitted. The third backing plate 531 and the fourth backing plate 532 are both attached to the inner wall of the detection box 1. The lengths of the third backing plate 531 and the fourth backing plate 532 are the same as the inner diameter of the detection box. The water discharged from the permeation zone can only be discharged through the bottom opening of the hollow fiber group. Designing the third backing plate and the fourth backing plate as U-shaped can realize that the third backing plate and the fourth backing plate wrap and seal the outside of the hollow fiber group from the outside. In this way, the detection box, the third backing plate, the fourth backing plate and the hollow fiber group are seamlessly connected, ensuring that the water can only be discharged downward from the hollow fiber tube. The connection between the third backing plate and the fourth backing plate can also be filled with environmental resin.

[0048] The detection method for the hydrophilic property of the nano-film, the detection method includes the following steps:

[0049] S1. Fabricate the component 5 to be detected:

[0050] Manufacture the upper reserved positioning member 51: Embed the first backing plate 511 into the lower template 22 of the backing plate installation mold 2. A first groove is provided at the center of the surface of the lower template 22, and the first backing plate 511 with equal thickness is embedded inside the first groove. Side baffles 221 are vertically provided at the outer ends of the surface of the lower template 22. The upper template 21 is assembled and connected to the top of the lower template 22. A second groove is provided at the center of the upper template 21, and the second backing plate 512 with equal thickness is embedded inside the second groove. Fill resin with a thickness of 6 - 10 mm is applied to the surfaces of the first backing plate 511 and the second backing plate 512; the resin applied in the early stage can facilitate the positioning of the first backing plate and the second backing plate. Place the heads of multiple sampled hollow fiber tubes in a horizontal linear array one by one on the first backing plate 511. The part of the head of the hollow fiber tube extending outside the first backing plate 511 abuts against the side baffle 221, and the first backing plate 511 is bonded to the bottom surface of each hollow fiber tube through the filled resin. Invert the upper template 21 on the top of the lower template 22. The side surface of the upper template 21 fits against the inner wall of the side baffle 221, and the second backing plate 512 is bonded to the top surface of each hollow fiber tube through the filled resin. This step can quickly and accurately fix the first backing plate and the second backing plate on both sides of the hollow fiber tube. The design of the side baffle can sort out the heads of each hollow fiber tube, so that the ends of each hollow fiber tube can be aligned and flat. At the same time, the side baffle also facilitates the guiding and insertion of the upper template, so that the first backing plate and the second backing plate can be aligned and accurately installed on both sides of the hollow fiber group;

[0051] Manufacture the lower reserved positioning member: Embed the third backing plate 531 into the lower template 22 of another group of backing plate installation molds 2. The fourth backing plate 532 is embedded at the center of another group of upper templates 21. Fill resin with a thickness of 6 - 10 mm is applied to the surfaces of the third backing plate 531 and the fourth backing plate 532. Place the tails of multiple hollow fiber tubes in a horizontal linear array one by one on the third backing plate 531. The part of the tail of the hollow fiber tube extending outside the third backing plate 531 abuts against the side baffle, and the third backing plate is bonded to the bottom surface of each hollow fiber tube through the filled resin. Invert another group of upper templates on the top of the lower template. The side surface of the upper template fits against the inner wall of the side baffle, and the fourth backing plate is bonded to the top surface of each hollow fiber tube through the filled resin. This step can quickly and accurately fix the third backing plate and the fourth backing plate on both sides of the hollow fiber tube;

[0052] Fill epoxy resin into the head opening of the hollow fiber group; Insert the head of the hollow fiber group upside down into the box filled with epoxy resin, so that the epoxy resin fills into the hollow fiber tube;

[0053] Stationary the upper reserved positioning member, the lower reserved positioning member and the hollow fiber group, and use a cold air blower to dry the epoxy resin to obtain the component to be detected; After the drying and positioning are completed, then separate the mold to avoid the separation of the component to be detected;

[0054] S2. Install the component to be detected:

[0055] Open the cover plate 4 and place the component 5 to be detected in the detection box 1;

[0056] Drive the lower clamping cylinder 7 to move, so that the two lower baffles 71 move inward and stop at the top of the lower reserved positioning part 53;

[0057] Gently lift the component 5 to be detected upward with a little force. The lower reserved positioning part 53 abuts against the lower baffle 71, and the hollow fiber group 52 is in a taut state. Then drive the upper clamping cylinder 6 to move, and the two upper support plates 61 move to stop at the bottom of the upper reserved positioning part 51, so that the hollow fiber group remains in a taut state; By using the above installation method, it can further ensure that the hollow fiber tube is in a straightened state, ensure the detection accuracy, and at the same time, it can also realize the stop positioning of the component to be detected from the inside;

[0058] S3. Hydrophilicity detection:

[0059] Cover the cover plate 4, and the water injection pipe 9 injects distilled water into the liquid adding area 12, and the water injection volume is G1;

[0060] The water in the liquid adding area 12 is injected into the permeation area 13 through the water adding port 513, and the hollow fiber group 52 is immersed in the distilled water;

[0061] The pressure air pump fills high-pressure gas into the pressurization area to increase the internal air pressure of the detection box 1;

[0062] The distilled water passes through the nano-pores on each hollow fiber tube and then enters the hollow fiber tube. The hollow fiber tube adsorbs part of the water under the action of hydrophilicity and finally gathers and flows out to the liquid discharge area;

[0063] After the permeation and filtration are completed, open the valve of the liquid discharge area, so that the filtered distilled water is discharged into the measuring component. The measuring component measures that the water output is G2, and the difference between G1 and G2 is the water adsorption amount of the hollow fiber group; The measuring component includes a measuring cylinder 31 and a weighing platform 32. The discharged water enters the measuring cylinder, and the weighing platform can measure the water output.

[0064] The hydrophilicity detection standard is: the normal water absorption range is 0.2 - 0.3, and the loss amount of the detection device is 0.04 - 0.07. Thus, it can be determined that the hydrophilicity detection standard is: 0.24 - 0.37;

[0065] Exemplarily, G1 is 10, G2 is 9.75, and the difference between the two is 0.25. The value is within the detection standard, and the hydrophilicity meets the requirements.

[0066] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0067] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for detecting the hydrophilic property of a nano - film, characterized in that: Including a detection box, the detection box is in the shape of a flat cuboid. Inside the detection box, from top to bottom, there are a pressurization area, a liquid addition area, a penetration area, and a drainage area in sequence. A pressurization air pump is connected to the side of the pressurization area, and a water injection pipe is connected to the side of the liquid addition area. The water injection pipe is used to quantitatively inject distilled water into the liquid addition area. The pressurization air pump is used to increase the air pressure inside the detection box. A component to be detected is installed inside the penetration area, and a measurement component is installed at the bottom of the drainage area. The measurement component is used to detect the water output of the distilled water discharged from the drainage area; by judging whether the difference between the water injection volume and the water output volume is within the qualified hydrophilicity range, the hydrophilicity of the component to be detected can be determined. The component to be detected includes an upper reserved positioning part, a hollow fiber group, and a lower reserved positioning part. The hollow fiber group is formed by sequentially bonding hollow fiber tubes in a linear array. Filling resin is embedded in the area between adjacent hollow fiber tubes, and filling resin is embedded at the top opening of each hollow fiber tube. An upper reserved positioning part is bonded to the outer wall of the top of the hollow fiber group, and a lower reserved positioning part is bonded to the outer wall of the bottom. The upper reserved positioning part and the lower reserved positioning part are respectively fixed to the top and bottom of the penetration area. The upper reserved positioning part includes a first backing plate and a second backing plate. The first backing plate and the second backing plate are symmetrically bonded to both sides of the top of the hollow fiber group. An upper clamping cylinder is vertically arranged on the outer wall of the detection box. Two upper support plates are slidably installed at the output end of the upper clamping cylinder. The two upper support plates are respectively inserted into the penetration area seamlessly from both sides of the detection box, and the two upper support plates respectively abut against the bottom surfaces of the first backing plate and the second backing plate. The lower reserved positioning part includes a third backing plate and a fourth backing plate. The third backing plate and the fourth backing plate are symmetrically bonded to both sides of the bottom of the hollow fiber group. A lower clamping cylinder is vertically arranged on the outer wall of the detection box. Two lower support plates are slidably installed at the output end of the lower clamping cylinder. The two lower support plates are respectively inserted into the penetration area seamlessly from both sides of the detection box, and the two lower support plates respectively abut against the top surfaces of the third backing plate and the fourth backing plate.

2. The device for detecting the hydrophilic property of a nano - film according to claim 1, characterized in that: The structures of the first backing plate and the second backing plate are the same and are both rectangular plate structures. The first backing plate and the second backing plate are both placed in contact with the inner wall of the detection box. The lengths of the first backing plate and the second backing plate are the same as the inner diameter of the detection box. The area between the first backing plate and the second backing plate except for the hollow fiber group is an opening, and the opening and the inner wall of the detection box form a water addition port. The water in the penetration area can only be injected through the water addition port.

3. The device for detecting the hydrophilic property of a nano - film according to claim 1, characterized in that: The structures of the third backing plate and the fourth backing plate are the same and are both U-shaped. The third backing plate, the fourth backing plate, and the hollow fiber group are assembled in seamless contact. The third backing plate and the fourth backing plate are both placed in contact with the inner wall of the detection box. The lengths of the third backing plate and the fourth backing plate are the same as the inner diameter of the detection box. The water discharged from the penetration area can only be discharged through the bottom opening of the hollow fiber group.

4. A method for detecting the hydrophilic property of a nano - film, characterized in that: Applying a nano-film hydrophilicity detection device according to claim 3 above; the detection method includes the following steps: S1. Fabricate the component to be detected: Manufacturing upper reserved positioning parts: Embed the first backing plate into the lower template of the backing plate installation mold. A first groove is provided at the center of the surface of the lower template, and a first backing plate with equal thickness is embedded inside the first groove. Side baffles are vertically provided at the outer ends of the surface of the lower template. An upper template is assembled and connected to the top of the lower template. A second groove is provided at the center of the upper template, and a second backing plate with equal thickness is embedded inside the second groove. Fill resin with a thickness of 6 - 10 mm is applied to the surfaces of the first backing plate and the second backing plate; Place the heads of multiple sampled hollow fiber tubes in a horizontal linear array one by one on the first backing plate. The part of the head of the hollow fiber tube extending outside the first backing plate abuts against the side baffle. The first backing plate is bonded to the bottom surface of each hollow fiber tube through the fill resin; Invert the upper template on the top of the lower template. The side surface of the upper template fits against the inner wall of the side baffle. The second backing plate is bonded to the top surface of each hollow fiber tube through the fill resin; Manufacturing lower reserved positioning parts: Embed the third backing plate into the lower template of another set of backing plate installation molds. A fourth backing plate is embedded at the center of the other upper template. Fill resin with a thickness of 6 - 10 mm is applied to the surfaces of the third backing plate and the fourth backing plate; Place the tails of multiple hollow fiber tubes in a horizontal linear array one by one on the third backing plate. The part of the tail of the hollow fiber tube extending outside the third backing plate abuts against the side baffle. The third backing plate is bonded to the bottom surface of each hollow fiber tube through the fill resin; Invert the other upper template on the top of the lower template. The side surface of the upper template fits against the inner wall of the side baffle. The fourth backing plate is bonded to the top surface of each hollow fiber tube through the fill resin; Fill epoxy resin into the head openings of the hollow fiber bundle; Stationary the upper reserved positioning parts, the lower reserved positioning parts and the hollow fiber bundle, and use a cold air blower to dry the epoxy resin to obtain the component to be detected; S2. Install the component to be detected: Open the cover plate and place the component to be detected inside the detection box; Drive the lower clamping cylinder to move, so that the two lower baffles move inward to stop against the top of the lower reserved positioning parts; Gently lift the component to be detected upward with force. The lower reserved positioning parts abut against the lower baffles, and the hollow fiber bundle is in a taut state. Then drive the upper clamping cylinder to move, and the two upper support plates move to stop against the bottom of the upper reserved positioning parts, so that the hollow fiber bundle remains in a taut state; S3. Hydrophilicity detection: Cover the cover plate, and inject distilled water into the liquid addition area through the water injection pipe, and the water injection volume is G1; The water in the liquid addition area is injected into the permeation area through the water addition port, and the hollow fiber bundle is immersed in the distilled water; The pressurized air pump fills high-pressure gas into the pressurization area to increase the internal air pressure of the detection box The distilled water passes through the nanopores on each hollow fiber tube and then enters the hollow fiber tube. The hollow fiber tube adsorbs part of the water under the action of hydrophilicity, and finally aggregates and flows out to the drainage area; After the permeation filtration is completed, open the valve of the drainage area, so that the filtered distilled water is discharged into the measuring component, and the measuring component measures the water output as G2. The difference between G1 and G2 is the water adsorption amount of the hollow fiber bundle.

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