Device for obtaining end faces of hollow fiber membrane filaments

Abstract

The invention discloses a device for obtaining the end face of a hollow fiber membrane filament, and relates to the technical field of membranes. The bent channel has a certain curvature radius and is provided with a hollow-out part, the hollow fiber membrane filaments penetrate through the container along the bent channel, the curvature radius of the hollow fiber membrane filaments in the bent channel is the same as that of the bent channel, and the hollow-out part is immersed in the liquid nitrogen. According to the device, a bent channel with a certain curvature radius is arranged in a container, liquid nitrogen is contained in the container, hollow fiber membrane filaments have the curvature radius the same as that of the bent channel in the bent channel, namely, the hollow fiber membrane filaments are in full contact with the liquid nitrogen through the bent channel in the container, and the hollow fiber membrane filaments are bent by a certain angle through the bent channel in the container; the hollow fiber membrane filament is beneficial to rapid quenching and breaking under the action of bending stress, and the end face quenched and broken under a certain curvature radius is high in smoothness. The liquid nitrogen is used for quenching and breaking the hollow fiber membrane filaments in the closed container, so that the operation safety of operators can be improved.

Description

Technical Field

[0001] The present invention relates to the field of membrane technology, and more specifically, to a device for obtaining the end face of a hollow fiber membrane. Background Art

[0002] At present, the general method of producing hollow fiber membranes is wet spinning. The core liquid and the spinning liquid are sprayed out through the annular spinneret to become primary fibers. The primary fibers are transformed into hollow fiber membranes through non-solvent phase formation, elution, drying and collection. Hollow fiber membranes are mainly used in hemodialysis, water treatment and other aspects. Their types are usually divided by observing the microscopic structure of the membrane end face. For example, symmetric membranes have the same pore structure at the end face; and asymmetric membranes have a dense layer and a support layer at the end face, and the pore structure changes in the dense layer and the support layer. The thickness of the membrane or the thickness of each layer of the membrane leads to different performances of hollow fiber membranes. For example, the thickness of the dense layer affects the separation performance of the membrane for substances, the thickness of the support layer determines the support strength of the membrane, and the thickness of the separation layer and the support layer of the membrane are important parameters affecting filtration efficiency and safety. Therefore, the acquisition of the end face of the hollow fiber membrane has an important impact on the study of the structure of the hollow fiber membrane.

[0003] In the prior art, a scanning electron microscope is generally used to observe the end face structure of hollow fiber membrane filaments. A smooth (i.e. horizontal and smooth) end face is a prerequisite for successfully observing the end face structure of the membrane filament (the horizontal requirement is conducive to measuring the diameter of the membrane filament end face or the thickness of the dense layer and the support layer, and the smooth requirement is to facilitate clear observation of the microstructure of the end face). At present, a blade is generally used to cut the hollow fiber membrane filament to obtain the end face. For example, the hollow fiber membrane filament is laid flat on a glass plate, and a sharp blade is used to quickly cut the hollow fiber to obtain the end face of the membrane filament. However, this method easily causes the end face of the membrane filament to deform and become rough, which is not conducive to the observation of the microscopic morphology of the end face structure of the membrane filament. There is also a method of pouring liquid nitrogen into a paper cup, immersing the hollow fiber membrane filament in the liquid nitrogen, and taking out the hollow fiber membrane filament after the hollow fiber membrane filament is quenched and broken, and placing it under a scanning electron microscope for observation. However, the method of pouring liquid nitrogen into a paper cup to quench the hollow fiber membrane requires a person to hold the hollow fiber membrane filament. Human factors lead to poor stability of the membrane filament, which causes changes in the radius of curvature of the hollow fiber membrane filament. The change in the radius of curvature causes unstable bending stress on the hollow fiber membrane filament at the quenching point. This instability causes the quenched end face to be easily deformed or have poor smoothness.

[0004] In summary, how to provide a safe and simple device for obtaining a smooth end surface of a hollow fiber membrane is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a device for obtaining the end surface of a hollow fiber membrane, which is a safe and simple device for obtaining the smooth end surface of a hollow fiber membrane.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A device for obtaining the end face of a hollow fiber membrane, comprising:

[0008] a container, the interior of which contains liquid nitrogen;

[0009] A curved channel is located at the lower part of the container, the curved channel has a certain curvature radius and is provided with a hollow portion, the hollow fiber membrane passes through the container along the curved channel, the curvature radius of the hollow fiber membrane in the curved channel is the same as the curvature radius of the curved channel, and the liquid nitrogen immerses the hollow portion.

[0010] In one embodiment, the curvature radius of the bottom of the curved channel is 55 mm-65 mm.

[0011] In one embodiment, the junction of the curved channel and the container is located at the 1 / 2 position of the bottom of the container, the bottom of the curved channel is 0.5-2 cm away from the bottom of the container, and the height of the liquid nitrogen level in the container is 3 cm-5 cm.

[0012] In one embodiment, the included angle between the curved channel and the container wall is 25°-35°.

[0013] In one embodiment, a medicine injection port is provided on the top of the container, and handles are provided on both sides of the container.

[0014] In one embodiment, it also includes a clamp and a height adjustment device for adjusting and fixing the position of the clamp, and the two ends of the hollow fiber membrane passing through the container are respectively clamped by two relatively distributed clamps.

[0015] In one embodiment, the height adjustment device is disposed on two opposite sides of the container, and the height adjustment device is connected to the clamper to drive the clamper to move up and down.

[0016] In one embodiment, the height adjustment device includes two relatively distributed support bodies, a sliding body that slides up and down along the support body, and a regulating valve. The regulating valve is installed at one end of the sliding body to fix the sliding body on the support body. The other end of the sliding body is provided with a threaded hole, and the threaded rod of the clamp is fixedly connected to the threaded hole.

[0017] In one embodiment, the height adjustment device is a lift, and the lift includes a support plate, a motor provided at the lower part of the support plate, a main roller sleeved on the outer periphery of the output shaft of the motor, a slave roller provided at the upper part of the support plate, a synchronous belt wound around the outer periphery of the main roller and the slave roller, a synchronous clamp provided on the synchronous belt, a movable plate connected to the synchronous clamp, a connecting rod for connecting two relatively distributed movable plates, a sliding rod vertically provided between the two movable plates, a pulley sleeved on the outer periphery of the sliding rod, a connecting plate provided on one side of the support plate, a limiting plate provided on the movable plate, a fixed plate for connecting to the clamp, and a connecting piece for connecting the movable plate and the fixed plate;

[0018] An upper limit sensor and a lower limit sensor are arranged on the support plate. When the limit plate contacts the upper limit sensor or the lower limit sensor, the motor automatically changes the rotation direction to avoid damaging the lifter.

[0019] In one embodiment, a protective sleeve is provided on the clamping body of the clamp, and the protective sleeve comprises a hollow hose.

[0020] When using the device for obtaining the end face of the hollow fiber membrane provided by the present invention, first, the hollow fiber membrane is inserted from the entrance of the curved channel of the container so that the hollow fiber membrane passes through the curved channel and leaves the container from the outlet of the curved channel, and the clamp is adjusted to a suitable height by the height adjustment device. The two ends of the hollow fiber membrane exposed outside the container are clamped by clamps fixed at a certain height respectively. Then, liquid nitrogen is added to the container, and the hollow fiber membrane can contact with the liquid nitrogen in the container through the hollow part of the curved channel. After the contact time between the hollow fiber membrane and the liquid nitrogen exceeds 15s, the hollow fiber membrane is broken. At this time, the two ends of the hollow fiber membrane are removed from the clamp, and the hollow fiber membrane is pulled out of the container to obtain a hollow fiber membrane with a smooth end face. The device is simple and convenient to operate.

[0021] The device is provided with a curved channel with a certain radius of curvature in the container, and is filled with liquid nitrogen. The hollow fiber membrane filament presents the same radius of curvature as the curved channel in the curved channel, that is, the curved channel in the container causes the hollow fiber membrane filament to bend at a certain angle, and the radius of curvature of the hollow fiber membrane filament will not change arbitrarily, which can avoid the phenomenon that the bending stress of the hollow fiber membrane filament at the quenching point caused by the change of the radius of curvature is unstable. Therefore, during the use of the device, the hollow fiber membrane filament is conducive to the rapid quenching of the hollow fiber membrane filament under the action of the bending stress, and the end surface smoothness of the quenching is high at a certain radius of curvature. Moreover, since the liquid nitrogen quenches the hollow fiber membrane filament in a closed container, it helps to provide the operator with operational safety.

[0022] In summary, the device for obtaining the end surface of a hollow fiber membrane provided by the present invention is a safe and simple device for obtaining the smooth end surface of a hollow fiber membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of a device for obtaining the end face of a hollow fiber membrane provided by an embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the container;

[0026] Figure 3 is a cross-sectional schematic diagram of a container;

[0027] Figure 4 for Figure 3 A local enlarged view of point A;

[0028] Figure 5 A schematic diagram of the structure of a height adjustment device provided by an embodiment of the present invention;

[0029] Figure 6 It is a structural schematic diagram of a regulating valve and a sliding body;

[0030] Figure 7 is a schematic diagram of the connection between the clamp and the sliding body;

[0031] Figure 8 The schematic diagram of the structure of the elevator is shown in FIG.

[0032] Fig. 9 This is a structural diagram of the elevator from another perspective;

[0033] Fig.10 It is a schematic diagram of the connection between the synchronous clamp and the synchronous belt;

[0034] Fig.11 is a structural schematic diagram of a driven sliding device;

[0035] Fig.12 It is a schematic diagram of the structure of the protective cover;

[0036] Fig.13 The end face of the hollow fiber membrane obtained by cutting with a blade, and the microscopic morphology of the end face of the membrane under a scanning electron microscope are magnified 1000 times and 30000 times respectively;

[0037] Fig.14 The end face of the membrane fiber obtained by immersing the handheld hollow fiber membrane fiber into a paper cup stored in liquid nitrogen for extraction, and the microscopic morphology of the membrane fiber end face under a scanning electron microscope at 1000 times and 30000 times magnification respectively;

[0038] Fig.15 The end face of the hollow fiber membrane filament obtained by using the present device is an observation picture of the microscopic morphology of the end face of the membrane filament under a scanning electron microscope at magnifications of 1000 times and 30000 times respectively.

[0039] Reference numerals:

[0040] 1-container, 2-injection port, 3-handle, 4-bent channel, 5-through hole, 6-bottom plate, 7-groove, 8-support body, 9-scale, 10-sliding body, 11-regulating valve, 12-threaded hole, 13-clamp, 14-elevator, 15-support plate, 16-motor, 17-main roller, 18-slave roller, 19-synchronous belt, 20-synchronous clamp, 21-moving plate, 22-connecting rod, 23-sliding rod, 24-pulley, 25-connecting plate, 26-limiting piece, 27-upper limit sensor, 28-lower limit sensor, 29-connecting piece, 30-fixed plate, 31-protective cover, 32-hollow fiber membrane. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The core of the present invention is to provide a device for obtaining the end surface of a hollow fiber membrane, which is a safe and simple device for obtaining the smooth end surface of a hollow fiber membrane.

[0043] Please refer to Figures 1 to 15 .

[0044] This specific embodiment provides a device for obtaining the end surface of a hollow fiber membrane, comprising:

[0045] A container 1, containing liquid nitrogen;

[0046] The curved channel 4 is located at the lower part of the container 1. The curved channel 4 has a certain curvature radius and is provided with a hollow portion. The hollow fiber membrane filament 32 passes through the container 1 along the curved channel 4. The curvature radius of the hollow fiber membrane filament 32 in the curved channel 4 is the same as the curvature radius of the curved channel 4. The hollow portion is immersed in liquid nitrogen.

[0047] It should be noted that the container 1 can be set as a stainless steel insulation barrel with a narrow bottom and a wide top, which is used to store liquid nitrogen during the quenching operation. The design of a narrow bottom and a wide top can reduce the use of liquid nitrogen, and less liquid nitrogen can reach the required liquid level, so that the hollow fiber membrane filaments 32 are immersed in liquid nitrogen through the hollow part. Of course, the container 1 can also be set to a structure of other shapes according to actual conditions.

[0048] In actual use, the shape, structure, size, material, etc. of the container 1, the curved channel 4 and the hollow portion can be determined according to actual conditions and actual needs.

[0049] When using the device for obtaining the end face of the hollow fiber membrane provided by the present invention, first, the hollow fiber membrane filament 32 is inserted from the entrance of the curved channel 4 of the container 1, so that the hollow fiber membrane filament 32 passes through the curved channel 4 and leaves the container 1 from the outlet of the curved channel 4, and the clamp 13 is adjusted to a suitable height by the height adjustment device. The two ends of the hollow fiber membrane filament 32 exposed outside the container 1 are clamped by the clamp 13 fixed at a certain height respectively. Then, liquid nitrogen is added to the container 1, and the hollow fiber membrane filament 32 can contact with the liquid nitrogen in the container 1 through the hollow part of the curved channel 4. After the contact time between the hollow fiber membrane filament 32 and the liquid nitrogen exceeds 15s, the hollow fiber membrane filament 32 is broken. At this time, the two ends of the hollow fiber membrane filament 32 are removed from the clamp 13, and the hollow fiber membrane filament 32 is pulled out of the container to obtain the hollow fiber membrane filament 32 with a smooth end face. The device is simple and convenient to operate.

[0050] The device is provided with a curved channel 4 with a certain radius of curvature in the container 1, and liquid nitrogen is contained therein. The hollow fiber membrane filament 32 presents the same radius of curvature as the curved channel 4 in the curved channel 4, that is, the hollow fiber membrane filament 32 is fully in contact with the liquid nitrogen through the curved channel 4 in the container 1. The curved channel 4 in the container 1 makes the hollow fiber membrane filament 32 bend at a certain angle, and the radius of curvature of the hollow fiber membrane filament 32 does not change arbitrarily, which can avoid the phenomenon that the bending stress of the hollow fiber membrane filament 32 at the quenching point caused by the change of the radius of curvature is unstable. Therefore, during the use of the device, the hollow fiber membrane filament 32 is conducive to the rapid quenching of the hollow fiber membrane filament 32 under the action of the bending stress, and the end surface smoothness of the quenching is high at a certain radius of curvature. Moreover, since the liquid nitrogen quenches the hollow fiber membrane filament 32 in the closed container 1, it helps to provide the operator with operational safety.

[0051] In summary, the device for obtaining the end surface of the hollow fiber membrane provided by the present invention is a safe and simple device for obtaining the smooth end surface of the hollow fiber membrane 32.

[0052] In one embodiment, the curvature radius of the bottom of the curved channel 4 is 55 mm-65 mm, and the bending stress to which the hollow fiber membrane filaments 32 are subjected at this curvature radius makes them more easily broken.

[0053] It should be noted that the bottom of the curved channel 4 refers to the arc portion between the lowest point and a point at a vertical distance of 1 cm from the lowest point of the curved channel 4 .

[0054] In one embodiment, the intersection of the curved channel 4 and the container 1 is located at the 1 / 2 position of the bottom of the container 1, the bottom of the curved channel 4 is 0.5-2 cm away from the bottom of the container 1, and the liquid nitrogen level in the container 1 is 3 cm-5 cm, so that the liquid nitrogen can fully immerse the bottom hollow part of the curved channel 4 and reduce the immersion dead angle at the bottom of the curved channel 4.

[0055] In one embodiment, the angle between the curved channel 4 and the wall of the container 1 is 25°-35°. Moreover, it is found through experiments that the quenching time of the hollow fiber membrane filament 32 at this radius of curvature is 15s, and the quenched end surface is smoother. In addition, the inner diameter of the curved channel 4 can be set to 2-5mm, and the hollow portion is provided with a through hole 5. The liquid nitrogen in the container 1 enters the curved channel 4 through the through hole 5, and fully contacts the hollow fiber membrane filament 32 in the curved channel 4, thereby causing the hollow fiber membrane filament 32 to quench. The above-mentioned size selection is the preferred size selection for this device. Of course, the specific size of each component can also be determined according to the actual situation and actual needs during actual use.

[0056] In one embodiment, a drug injection port 2 is provided at the top of the container 1. For example, the drug injection port 2 can be set to a funnel shape and used as an inlet for replenishing liquid nitrogen in the container 1. Handles 3 are provided on both sides of the container 1, and the handles 3 are used as action points for moving the container 1 to prevent operators from being frostbitten by the container 1 when moving the container 1.

[0057] It should be noted that a bottom plate 6 may also be provided, a groove 7 is provided in the middle of the bottom plate 6, and the container 1 is placed in the groove 7. That is, the bottom plate 6 is the carrier of the device, the container 1 is located on the bottom plate 6, the groove 7 is provided in the middle of the bottom plate 6, and the container 1 is placed in the groove 7 to prevent the sliding of the container 1 from affecting the operation.

[0058] In one embodiment, it also includes a clamp 13 and a height adjustment device for adjusting and fixing the position of the clamp 13. The position of the clamp 13 is adjusted and fixed by the height adjustment device, and the two ends of the hollow fiber membrane filament 32 passing through the container 1 are respectively clamped by two relatively distributed clamps 13, which can effectively improve the operational stability compared with manual operation. In the prior art, a blade is usually used to cut the hollow fiber membrane filament 32, which easily causes the end face of the hollow fiber membrane filament 32 to deform and have poor smoothness, which is not conducive to the observation of its microstructure by a scanning electron microscope. The present device fixes the clamp 13 and clamps the hollow fiber membrane filament 32 on the fixed clamp 13, thereby reducing the influence of human factors on the test results, and also reducing the labor intensity of the operator.

[0059] In one embodiment, a height adjustment device is disposed on opposite sides of the container 1, and the height adjustment device is connected to the clamp 13, so that the clamp 13 can be lifted and lowered by the height adjustment device, so that hollow fiber membranes 32 of different lengths can be clamped, which helps to improve the applicability of the device.

[0060] In one embodiment, Figures 5 to 7 As shown, the height adjustment device includes two relatively distributed support bodies 8, a sliding body 10 that slides up and down along the support body 8, and a regulating valve 11. The regulating valve 11 is installed at one end of the sliding body 10 so that the sliding body 10 is fixed on the support body 8. The other end of the sliding body 10 is provided with a threaded hole 12, and the threaded rod of the clamp 13 is fixedly connected to the threaded hole 12. The clamp 13 can stably fix the hollow fiber membrane filament 32 without manual control, thereby improving the stability of the operation and reducing the influence of human factors on the extraction process. Moreover, the height of the clamp 13 is adjusted by the height adjustment device in order to be suitable for the clamping of hollow fiber membrane filaments 32 of different lengths.

[0061] It should be noted that a support body 8 is provided at both ends of the bottom plate 6. The support body 8 is a cylinder with a certain height, which can be used as a carrier for adjusting the height of the device. A scale 9 can also be provided on the support body 8, and the scale 9 serves as a reference mark for the upward and downward movement of the sliding body 10 on the support body 8. Further, a regulating valve 11 can be installed on the sliding body 10, and the sliding body 10 can be fixed at a specified position of the support body 8 through the regulating valve 11. In addition, a threaded hole 12 is provided at the other end of the sliding body 10, and the threaded rod of the clamp 13 is fixedly connected to the threaded hole 12, and then the clamp 13 is driven to move up and down on the support body 8 by moving the sliding body 10.

[0062] In one embodiment, the height adjustment device is a lift 14, such as Figures 8 to 11As shown, the lift 14 includes a support plate 15, a motor 16 disposed at the bottom of the support plate 15, a main roller 17 sleeved on the outer periphery of the output shaft of the motor 16, a slave roller 18 disposed at the top of the support plate 15, a synchronous belt 19 wound around the outer periphery of the main roller 17 and the slave roller 18, a synchronous clamp 20 disposed on the synchronous belt 19, a moving plate 21 connected to the synchronous clamp 20, a connecting rod 22 for connecting two relatively distributed moving plates 21, and a sliding rod 23 vertically disposed between the two moving plates 21. , a pulley 24 sleeved on the outer periphery of the sliding rod 23, a connecting plate 25 arranged on one side of the support plate 15, a limit plate 26 arranged on the movable plate 21, a fixed plate 30 connected to the clamp 13 and a connecting piece 29 for connecting the movable plate 21 and the fixed plate 30; an upper limit sensor 27 and a lower limit sensor 28 are provided on the support plate 15. When the limit plate 26 contacts the upper limit sensor 27 or the lower limit sensor 28, the motor 16 automatically changes the rotation direction to avoid damaging the elevator 14.

[0063] It should be noted that the lifters 14 are located at both ends of the container 1 containing liquid nitrogen, and the lifters 14 are installed on the bottom plate 6. A clamp 13 is installed on each of the two lifters 14. The clamp 13 rises and falls with the lifters 14. After the clamp 13 reaches the height required for the test, the power supply of the lifters 14 can be turned off, and the clamp 13 can be fixed at a specific height position. In other words, the structures such as the support body 8, the sliding body 10 and the regulating valve 11 can be replaced by the lifters 14 that can be automatically lifted.

[0064] It should also be noted that the outer periphery of the output shaft of the motor 16 of the lift 14 is sleeved with a main roller 17, and the operation of the motor 16 drives the operation of the main roller 17. The main roller 17 is connected to the slave roller 18 through a synchronous belt 19. The synchronous clamp 20 connects the driven sliding device of the clamp 13 (which includes a moving plate 21, a connecting rod 22, a sliding rod 23, a pulley 24, a connecting plate 25, a fixed plate 30 and a connecting piece 29) with the synchronous belt 19 (the driven sliding device of this device is small in size and light in weight, and the synchronous belt 19 can easily drive it to move). The driven sliding device moves as the synchronous belt 19 moves up and down. A pulley 24 is provided inside the driven sliding, and the pulley 24 is in contact with the connecting plate 25, which is mainly used to reduce the displacement caused by inertia during braking.

[0065] It should be noted that the support plate 15 is a steel plate that provides support for the elevator 14; a motor 16 is installed at the lower end of the support plate 15, and the motor 16 provides power for the lifting of the elevator 14; one end of the motor 16 is connected to the main roller 17, and the rotation of the motor 16 drives the rotation of the main roller 17; a slave roller 18 is installed at the upper end of the support plate 15, and the main roller 17 and the slave roller 18 are connected by a synchronous belt 19, and the rotation of the main roller 17 drives the movement of the synchronous belt 19, and the rotation of the synchronous belt 19 drives the synchronous rotation of the slave roller 18; a notch is provided at one end of the synchronous clamp 20, and the synchronous belt 19 is installed in the notch of the synchronous clamp 20, and the synchronous clamp 20 is fixedly connected to the synchronous belt 19; the other end of the synchronous clamp 20 is fixedly connected to the movable plate 21, and the up and down movement of the synchronous belt 19 drives the up and down movement of the movable plate 21 through the synchronous clamp 20.

[0066] The movable plates 21 are connected by connecting rods 22, which play the role of fixing the movable plates 21; a sliding rod 23 is installed in the movable plate 21, and a pulley 24 is installed on the sliding rod 23, and the surface of the pulley 24 can be made of a rough sponge; a connecting plate 25 is installed on one side of the support plate 15, and the surface of the connecting plate 25 is coated with anti-slip polyurethane, the pulley 24 contacts the connecting plate 25 and moves on the connecting plate 25, and when the elevator 14 stops moving, the friction between the pulley 24 and the connecting plate 25 can reduce the displacement caused by inertia. A limit plate 26 is installed on the movable plate 21, and the limit plate 26 moves with the movement of the movable plate 21. When the limit plate 26 contacts the upper limit sensor 27 or the lower limit sensor 28, the motor 16 automatically changes the rotation direction to avoid damage to the elevator 14; a connecting member 29 is installed on the movable plate 21, and the connecting member 29 fixes the movable plate 21 with the fixed plate 30. The fixed plate 30 is provided with a threaded hole. The clamp 13 is connected to the threaded hole on the fixed plate 30, and the clamp 13 moves with the movement of the fixed plate 30.

[0067] In one embodiment, Fig.12 As shown, a protective sleeve 31 is provided on the clamping body of the clamp 13, and the protective sleeve 31 includes a hollow hose. That is, the protective sleeve 31 is a hollow hose made of a soft material (such as PVC) to prevent the clamp 13 from breaking the hollow fiber membrane filaments 32 and causing the hollow fiber membrane filaments 32 to fall off.

[0068] In order to further illustrate the effect of the present application, the following is a comparative observation of the microscopic morphology of the same hollow fiber membrane filament 32 obtained by cutting with a blade, the membrane filament end face obtained by immersing the hollow fiber membrane filament 32 in a paper cup stored in liquid nitrogen for extraction, and the membrane filament end face obtained by using the present device, under a scanning electron microscope, magnified 1000 times and 30000 times, respectively, corresponding to Fig.13 , Fig.14 as well as Fig.15 .

[0069] From the electron microscope photos, we can see that the end surface morphologies obtained by different methods are different. Fig.13 The thin wall of the obtained end face of the hollow fiber membrane 32 is squeezed and deformed by external force, and the end face of the hollow fiber membrane 32 is rough, so that the side channel structure of the hollow fiber membrane 32 cannot be effectively observed; Fig.14 The obtained membrane filament end faces also have a certain degree of deformation, and under a high-power microscope, it was observed that the inner surface of the side wall of the hollow fiber membrane filament 32 was squeezed and deformed, making it impossible to observe the internal pore microstructure of the hollow fiber membrane filament 32. Fig.15 The end surface of the obtained membrane filament is smooth, and the internal pore microstructure of the hollow fiber membrane filament 32 can be effectively observed under a high-power microscope.

[0070] It can be seen that the end face of the membrane filament obtained by using this device is smoother and more regular, and the microscopic morphology observed under the scanning electron microscope is clearer, which is more conducive to the study of the hollow fiber membrane structure and provides technical support for the improvement of the subsequent hollow fiber spinning process. That is, the end face of the hollow fiber membrane filament 32 obtained by using this device is smoother and flatter than the end face obtained by cutting with a blade and immersing the hollow fiber membrane filament 32 in a paper cup stored in liquid nitrogen, which reduces the damage to the end face of the membrane filament, is more conducive to the observation of the microscopic morphology, and the operation of this device is simple and safe, and can be promoted for use.

[0071] In addition, it should be noted that the orientation or positional relationship indicated by "upper" and "lower" etc. in the present invention is based on the orientation or positional relationship shown in the drawings and is only for the convenience of simplifying the description and facilitating understanding, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0072] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. Any combination of all embodiments provided by the present invention is within the protection scope of this invention and will not be described in detail here.

[0073] The above is a detailed introduction to the device for obtaining the end face of the hollow fiber membrane provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A device for obtaining the end face of a hollow fiber membrane, characterized in that: include: A container (1) containing liquid nitrogen; A curved channel (4) is located at the lower part of the container (1), the curved channel (4) has a certain curvature radius and is provided with a hollow portion, the hollow fiber membrane (32) passes through the container (1) along the curved channel (4), the curvature radius of the hollow fiber membrane (32) in the curved channel (4) is the same as the curvature radius of the curved channel (4), and the liquid nitrogen immerses the hollow portion.

2. The device for obtaining the end face of a hollow fiber membrane according to claim 1, characterized in that: The curvature radius of the bottom of the curved channel (4) is 55 mm-65 mm.

3. The device for obtaining the end face of a hollow fiber membrane according to claim 2, characterized in that: The intersection of the curved channel (4) and the container (1) is located at the 1 / 2 position of the bottom of the container (1), the bottom of the curved channel (4) is 0.5-2 cm away from the bottom of the container (1), and the height of the liquid nitrogen level in the container (1) is 3 cm-5 cm.

4. The device for obtaining the end face of a hollow fiber membrane according to claim 3, characterized in that: The included angle between the curved channel (4) and the wall of the container (1) is 25°-35°.

5. The device for obtaining the end surface of a hollow fiber membrane according to any one of claims 1 to 4, characterized in that: The top of the container (1) is provided with a medicine injection port (2), and handles (3) are correspondingly provided on two sides of the container (1).

6. The device for obtaining the end surface of a hollow fiber membrane according to any one of claims 1 to 4, characterized in that: It also includes a clamp (13) and a height adjustment device for adjusting and fixing the position of the clamp (13), and the two ends of the hollow fiber membrane (32) passing through the container (1) are respectively clamped by two relatively distributed clamps (13).

7. The device for obtaining the end face of a hollow fiber membrane according to claim 6, characterized in that: The height adjustment device is arranged on two opposite sides of the container (1), and the height adjustment device is connected to the clamp (13) to drive the clamp (13) to move up and down.

8. The device for obtaining the end face of a hollow fiber membrane according to claim 7, characterized in that: The height adjustment device comprises two supporting bodies (8) arranged relatively to each other, a sliding body (10) sliding up and down along the supporting body (8), and a regulating valve (11), wherein the regulating valve (11) is mounted on one end of the sliding body (10) so that the sliding body (10) is fixed on the supporting body (8), and a threaded hole (12) is provided at the other end of the sliding body (10), and a threaded rod of the clamp (13) is fixedly connected to the threaded hole (12).

9. The device for obtaining the end face of a hollow fiber membrane according to claim 7, characterized in that: The height adjustment device is a lift (14), the lift (14) comprising a support plate (15), a motor (16) disposed below the support plate (15), a main roller (17) sleeved on the outer periphery of an output shaft of the motor (16), a slave roller (18) disposed above the support plate (15), a synchronous belt (19) wound around the outer peripheries of the main roller (17) and the slave roller (18), a synchronous clamp (20) disposed on the synchronous belt (19), and a movable plate (20) connected to the synchronous clamp (20). 21), a connecting rod (22) for connecting two relatively distributed moving plates (21), a sliding rod (23) vertically arranged between the two moving plates (21), a pulley (24) sleeved on the outer periphery of the sliding rod (23), a connecting plate (25) arranged on one side of the supporting plate (15), a limiting plate (26) arranged on the moving plate (21), a fixing plate (30) for connecting to the clamp (13), and a connecting piece (29) for connecting the moving plate (21) and the fixing plate (30); An upper limit sensor (27) and a lower limit sensor (28) are provided on the support plate (15); when the limit plate (26) contacts the upper limit sensor (27) or the lower limit sensor (28), the motor (16) automatically changes its rotation direction to avoid damaging the lifter (14).

10. The device for obtaining the end surface of a hollow fiber membrane according to claim 6, characterized in that: A protective sleeve (31) is provided on the clamping body of the clamp (13), and the protective sleeve (31) comprises a hollow hose.

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