Device for obtaining end faces of hollow fiber membrane filaments

Abstract

The utility model 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 make 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 filaments are beneficial to rapid quenching and breaking under the action of bending stress, and the end faces which are quenched and broken under a certain curvature radius are 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 utility model relates to the field of membrane technology more specifically, relate to a kind of device for obtaining hollow fiber membrane filament end face. BACKGROUND

[0002] At present, the way of producing hollow fiber membrane filament is generally wet spinning, the core liquid and spinning solution are sprayed out into primary fiber through annular spinneret, and the primary fiber becomes hollow fiber membrane filament after processes such as non-solvent phase formation, elution, drying and fiber collection. Hollow fiber membrane filament is mainly used in hemodialysis, water treatment and other aspects, and its types are usually divided by observing the microstructure of membrane filament end face. For example, the end face hole structure of symmetric membrane is the same, while the end face of asymmetric membrane is divided into dense layer and support layer, and the hole structure changes in the dense layer and support layer. Different membrane thickness or thickness of each layer of membrane leads to different performance of hollow fiber membrane filament, such as the thickness of dense layer affecting the separation performance of membrane to material, the thickness of support layer determining the support strength of membrane, and the thickness of separation layer and support layer of membrane is an important parameter affecting filtration efficiency and safety. Therefore, the acquisition of hollow fiber membrane filament end face has an important influence on the research of hollow fiber membrane structure.

[0003] In the prior art, scanning electron microscope is generally used to observe the end face structure of hollow fiber membrane filament. Smooth (i.e. horizontal and smooth) end face is the prerequisite for successful observation of membrane filament end face structure (the requirement of horizontal is conducive to the measurement of diameter or thickness of dense layer and support layer of membrane filament end face, and the requirement of smooth is conducive to clear observation of microstructure of end face). At present, blade is generally used to cut hollow fiber membrane filament to obtain end face, for example, the hollow fiber membrane filament is laid flat on a glass plate, and the end face of the hollow fiber membrane filament is obtained by quickly cutting the hollow fiber membrane filament with a sharp blade. However, this method is easy to cause deformation and roughness of the end face of the membrane filament, which is not conducive to the observation of the microstructure of the end face 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, taking out the hollow fiber membrane filament after quenching and breaking of the hollow fiber membrane filament, and observing under scanning electron microscope. However, the method of quenching and breaking the hollow fiber membrane filament by pouring liquid nitrogen into a paper cup needs personnel to hold the hollow fiber membrane filament, and the stability of the membrane filament is poor due to human factors. The change of radius of curvature of the hollow fiber membrane filament leads to unstable bending stress of the hollow fiber membrane filament at the quenching and breaking end face, and the instability leads to easy deformation or poor smoothness of the quenching and breaking end face.

[0004] In summary, how to provide a safe and simple device for obtaining smooth end face of hollow fiber membrane filament is a problem to be solved by the technical personnel in the field at present. UTILITY MODEL CONTENT

[0005] In view of this, the purpose of this utility model is to provide a device for obtaining the end face of hollow fiber membrane filaments, which is a safe and simple device for obtaining the smooth end face of hollow fiber membrane filaments.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An apparatus for obtaining the end face of a hollow fiber membrane filament, comprising:

[0008] A container filled with liquid nitrogen;

[0009] A curved channel is located at the bottom of the container. The curved channel has a certain radius of curvature and is provided with a hollow part. Hollow fiber membrane filaments pass through the container along the curved channel. The radius of curvature of the hollow fiber membrane filaments in the curved channel is the same as the radius of curvature of the curved channel. The liquid nitrogen immerses the hollow part.

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

[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 0.5-2cm away from the bottom of the container, and the liquid nitrogen level in the container is 3cm-5cm.

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

[0013] In one embodiment, the top of the container is provided with an injection port, and the two sides of the container are provided with handles respectively.

[0014] In one embodiment, the device further includes a clamp and a height adjustment device for adjusting and fixing the position of the clamp, wherein the two ends of the hollow fiber membrane filament extending out of the container are respectively clamped by two oppositely distributed clamps.

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

[0016] In one embodiment, the height adjustment device includes two oppositely distributed supports, a sliding body that slides up and down along the supports, and an adjustment valve. The adjustment valve is installed at one end of the sliding body to fix the sliding body on the supports. 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 adjusting device is a lifting machine, which comprises a support plate, a motor arranged at the lower part of the support plate, a main roller arranged on the outer circumferential part of the output shaft of the motor, a slave roller arranged at the upper part of the support plate, a synchronous belt arranged around the outer circumferential parts of the main roller and the slave roller, a synchronous clamp arranged on the synchronous belt, a moving plate connected with the synchronous clamp, a connecting rod for connecting two opposite moving plates, a sliding rod arranged vertically between the two moving plates, a pulley arranged on the outer circumferential part of the sliding rod, a connecting plate arranged at one side of the support plate, a limiting piece arranged on the moving plate, a fixing plate for connecting with the clamp, and a connecting piece for connecting the moving plate and the fixing plate.

[0018] The support plate is provided with an upper limiting sensor and a lower limiting sensor, and when the limiting piece contacts with the upper limiting sensor or the lower limiting sensor, the motor automatically changes the rotating direction to avoid damaging the lifting machine.

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

[0020] When the device for obtaining the end face of the hollow fiber membrane filament is used, first, the hollow fiber membrane filament is inserted from the inlet of the curved channel of the container, so that the hollow fiber membrane filament passes through the curved channel and leaves the container from the outlet of the curved channel, the height adjusting device is used to adjust the clamp to a suitable height, the two ends of the hollow fiber membrane filament exposed outside the container are clamped by the clamps at a certain height, then liquid nitrogen is added into the container, the hollow fiber membrane filament can contact the liquid nitrogen in the container through the hollow part of the curved channel, after the hollow fiber membrane filament contacts the liquid nitrogen for more than 15s, the hollow fiber membrane filament is quenched, at this time, the two ends of the hollow fiber membrane filament are taken off from the clamps, the hollow fiber membrane filament is pulled out of the container, and the hollow fiber membrane filament with a smooth end face is obtained, and the device is simple and convenient to operate.

[0021] The device is provided with a curved channel with a certain curvature radius in the container and contains liquid nitrogen, the hollow fiber membrane filament in the curved channel has the same curvature radius as the curved channel, that is, the curved channel in the container bends the hollow fiber membrane filament by a certain angle, and the curvature radius of the hollow fiber membrane filament does not change at will, which can avoid the phenomenon that the bending stress of the hollow fiber membrane filament at the quenched part is unstable due to the change of the curvature radius, so in the use process of the device, the hollow fiber membrane filament is beneficial to rapid quenching under the action of the bending stress, and the quenched end face has high smoothness under a certain curvature radius. Moreover, the liquid nitrogen in the closed container quenches the hollow fiber membrane filament, which is helpful to provide the operation safety of the operator.

[0022] In summary, the device for obtaining the end face of the hollow fiber membrane filament is safe and simple. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the provided drawings without creative labor.

[0024] Figure 1 The structure diagram of the device for obtaining the end face of the hollow fiber membrane filament provided by an embodiment of the present application is shown in the figure.

[0025] Figure 2 The structure diagram of the container is shown in the figure.

[0026] Figure 3 The cross-sectional view of the container is shown in the figure.

[0027] Figure 4 The A part of the figure is an enlarged view. Figure 3

[0028] Figure 5 The structure diagram of the height adjusting device provided by an embodiment of the present application is shown in the figure.

[0029] Figure 6 The structure diagram of the adjusting valve and the sliding body is shown in the figure.

[0030] Figure 7 The connection diagram of the clamp and the sliding body is shown in the figure.

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

[0032] Figure 9 The structure diagram of the elevator from another perspective is shown in the figure.

[0033] Figure 10 The connection diagram of the synchronous clamp and the synchronous belt is shown in the figure.

[0034] Figure 11 The structure diagram of the driven sliding device is shown in the figure.

[0035] Figure 12 The structure diagram of the protective sleeve is shown in the figure.

[0036] Reference signs:

[0037] ​1-container, 2-injection port, 3-handle, 4-bent channel, 5-through hole, 6-bottom plate, 7-groove, 8-support, 9-scale, 10-sliding body, 11-regulating valve, 12-threaded hole, 13-clamp, 14-elevator, 15-support plate, 16-motor, 17-main roller, 18-from roller, 19-synchronous belt, 20-synchronous clamp, 21-moving plate, 22-connecting rod, 23-sliding rod, 24-pulley, 25-connection plate, 26-limiting piece, 27-upper limit sensor, 28-lower limit sensor, 29-connector, 30-fixing plate, 31-protection sleeve, 32-hollow fiber membrane wire. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0039] The core of the utility model provides a kind of device for obtaining the end face of hollow fiber membrane wire, it is a kind of device for obtaining the smooth end face of hollow fiber membrane wire safely and simply.

[0040] Please refer to Figures 1 to 12 .

[0041] The specific embodiment provides a kind of device for obtaining the end face of hollow fiber membrane wire, including:

[0042] Container 1, inside is equipped with liquid nitrogen;

[0043] Bent channel 4, it is located in the lower part of container 1, bent channel 4 has a certain curvature radius and is provided with a hollow part, hollow fiber membrane wire 32 passes through container 1 along bent channel 4, the curvature radius of hollow fiber membrane wire 32 in bent channel 4 and the curvature radius of bent channel 4 are same, liquid nitrogen immerses hollow part.

[0044] It should be noted that container 1 can be set as narrow lower wide upper stainless steel heat preservation bucket, for storing liquid nitrogen when quenching operation, the design of narrow lower wide upper can reduce the use of liquid nitrogen, and less liquid nitrogen can reach the required liquid level, so that hollow fiber membrane wire 32 is immersed by liquid nitrogen through hollow part. Of course, container 1 can also be set as other shapes of structure according to actual situation.

[0045] In actual application process, the shape, structure, size, material and the like of container 1, bent channel 4 and hollow part can be determined according to actual situation and actual demand.

[0046] In the use of the device for obtaining the end face of the hollow fiber membrane filament provided by the utility model, firstly, the hollow fiber membrane filament 32 is inserted from the inlet 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, the height adjusting device is used to adjust the clamping device 13 to a suitable height, the two ends of the hollow fiber membrane filament 32 exposed outside the container 1 are clamped in the clamping device 13 at a certain height respectively, then, liquid nitrogen is added into the container 1, the hollow fiber membrane filament 32 can contact the liquid nitrogen in the container 1 through the hollow part of the curved channel 4, after the hollow fiber membrane filament 32 contacts the liquid nitrogen for more than 15s, the hollow fiber membrane filament 32 is quenched, at this time, the two ends of the hollow fiber membrane filament 32 are taken off from the clamping device 13, the hollow fiber membrane filament 32 is taken out from the container, and the hollow fiber membrane filament 32 with a smooth end face can be obtained, and the device is simple and convenient to operate.

[0047] The device is provided with the curved channel 4 with a certain curvature radius in the container 1 and contains liquid nitrogen, the hollow fiber membrane filament 32 presents the same curvature radius as the curved channel 4 in the curved channel 4, that is, the hollow fiber membrane filament 32 fully contacts the liquid nitrogen through the curved channel 4 in the container 1, the curved channel 4 in the container 1 bends the hollow fiber membrane filament 32 by a certain angle, and the curvature radius of the hollow fiber membrane filament 32 does not change randomly, so that the phenomenon that the bending stress received by the hollow fiber membrane filament 32 at the quenched part is unstable due to the change of the curvature radius is avoided, therefore, in the use process of the device, the hollow fiber membrane filament 32 is beneficial to the rapid quenching of the hollow fiber membrane filament 32 under the action of the bending stress, and the end face quenched under the certain curvature radius has high smoothness. Moreover, the liquid nitrogen quenches the hollow fiber membrane filament 32 in the closed container 1, which is helpful to provide the operation safety of the operator.

[0048] In conclusion, the device for obtaining the end face of the hollow fiber membrane filament provided by the utility model is a safe and simple device for obtaining the smooth end face of the hollow fiber membrane filament 32.

[0049] In one embodiment, the curvature radius of the bottom of the curved channel 4 is 55mm-65mm, and the bending stress received by the hollow fiber membrane filament 32 under the curvature radius makes it more easily quenched.

[0050] It should be noted that the bottom of the curved channel 4 refers to the circular arc part between the position 1cm vertically away from the lowest point of the curved channel 4 and the lowest point.

[0051] 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 distance between the bottom of the curved channel 4 and the bottom of the container 1 is 0.5-2cm, and the liquid nitrogen liquid level in the container 1 is 3cm-5cm, so that the liquid nitrogen fully immerses the hollow part of the bottom of the curved channel 4 and reduces the immersion dead angle at the position of the bottom of the curved channel 4.

[0052] In one embodiment, the angle between the curved channel 4 and the wall of the container 1 is 25-35°, and it is found through experiments that the quenching time of the hollow fiber membrane filament 32 under this curvature radius is 15s, and the quenching end face is smoother. Moreover, the inner diameter of the curved channel 4 can be set to 2-5mm, the hollow part is provided with a through hole 5, and the liquid nitrogen in the container 1 enters the curved channel 4 through the through hole 5 to fully contact the hollow fiber membrane filament 32 in the curved channel 4, thereby causing the hollow fiber membrane filament 32 to quench. The above size selection is the preferred size selection of the device, and of course the specific size of each part can be determined according to the actual situation and actual needs during actual application.

[0053] In one embodiment, the top of the container 1 is provided with a medicine injection port 2, for example, the medicine injection port 2 can be set as a funnel shape, which is used as the inlet for supplementing the liquid nitrogen in the container 1. The container 1 is provided with handles 3 on both sides, which are used as the action point for moving the container 1 to prevent the operator from being frozen by the container 1 when moving the container 1.

[0054] It should be noted that a bottom plate 6 can also be provided, the middle part of the bottom plate 6 is provided with a groove 7, and the container 1 is placed in the groove 7. That is, the bottom plate 6 is the carrier of the device, and the container 1 is located above the bottom plate 6. The middle part of the bottom plate 6 is provided with a groove 7, and the container 1 is placed in the groove 7 to prevent the sliding of the container 1 from affecting the operation.

[0055] In one embodiment, it also includes a holder 13 and a height adjusting device for adjusting and fixing the position of the holder 13. The position of the holder 13 is adjusted and fixed by the height adjusting device, and the two ends of the hollow fiber membrane filament 32 that penetrates out of the container 1 are clamped by two oppositely distributed holders 13, which can effectively improve the operation stability compared with manual operation. In the prior art, a blade is usually used to cut the hollow fiber membrane filament 32, which can easily cause the end face of the hollow fiber membrane filament 32 to deform and have poor smoothness, which is not conducive to the observation of the microstructure by a scanning electron microscope. The holder 13 is fixed, and the hollow fiber membrane filament 32 is clamped on the fixed holder 13, which can reduce the influence of human factors on the test results and also reduce the labor intensity of the operator.

[0056] In one embodiment, the height adjusting device is arranged on the opposite sides of the container 1, and the height adjusting device is connected with the holder 13 to drive the holder 13 to move up and down, so that hollow fiber membrane filaments 32 of different lengths can be clamped, which helps to improve the applicability of the device.

[0057] In one embodiment, as shown in Figures 5 to 7As shown, the height adjusting device comprises two oppositely distributed support bodies 8, a sliding body 10 sliding up and down on the support bodies 8, and an adjusting valve 11 installed at one end of the sliding body 10 to fix the sliding body 10 on the support bodies 8, and the other end of the sliding body 10 is provided with a threaded hole 12, and the threaded rod of the holder 13 is fixedly connected with the threaded hole 12. The holder 13 can stably fix the hollow fiber membrane filament 32, without manual holding, improving the stability of operation and reducing the influence of human factors on the extraction process. Moreover, the height of the holder 13 is adjusted by the height adjusting device to adapt to the holding of hollow fiber membrane filaments 32 of different lengths.

[0058] It should be noted that the support bodies 8 are provided at both ends of the bottom plate 6, and the support bodies 8 are cylindrical bodies with a certain height, which can be used as a carrier for adjusting the height of the device. The support bodies 8 can also be provided with scales 9 as reference marks for the up and down movement of the sliding body 10 on the support bodies 8. Further, the adjusting valve 11 can be installed on the sliding body 10, and the sliding body 10 is fixed at a specified position of the support body 8 through the adjusting valve 11. Moreover, the other end of the sliding body 10 is provided with a threaded hole 12, and the threaded rod of the holder 13 is fixedly connected with the threaded hole 12, and then the holder 13 is moved up and down on the support body 8 by moving the sliding body 10.

[0059] In one embodiment, the height adjusting device is a lifting machine 14, as shown in the accompanying drawings. Figures 8 to 11 As shown, the lifting machine 14 comprises a support plate 15, a motor 16 provided at the lower part of the support plate 15, a main roller 17 sleeved on the outer peripheral part of the output shaft of the motor 16, a slave roller 18 provided at the upper part of the support plate 15, a synchronous belt 19 wound around the outer peripheral parts of the main roller 17 and the slave roller 18, a synchronous clamp 20 provided on the synchronous belt 19, a moving plate 21 connected with the synchronous clamp 20, a connecting rod 22 for connecting two oppositely distributed moving plates 21, a sliding rod 23 vertically provided between the two moving plates 21, a pulley 24 sleeved on the outer peripheral part of the sliding rod 23, a connecting plate 25 provided at one side of the support plate 15, a limiting piece 26 provided on the moving plate 21, a fixing plate 30 for connecting with the holder 13, and a connecting piece 29 for connecting the moving plate 21 with the fixing plate 30; the support plate 15 is provided with an upper limiting sensor 27 and a lower limiting sensor 28, when the limiting piece 26 contacts with the upper limiting sensor 27 or the lower limiting sensor 28, the motor 16 automatically changes the rotating direction to avoid damaging the lifting machine 14.

[0060] It is to be noted that the elevators 14 are located at both ends of the container 1 containing liquid nitrogen, and the elevators 14 are installed on the bottom plate 6, and each of the two elevators 14 is installed with a gripper 13, the gripper 13 is raised and lowered along with the elevators 14, and after the gripper 13 reaches the required height for the test, the power of the elevators 14 is turned off, and the gripper 13 can be fixed at a specific height position. The structure of the supporting body 8, the sliding body 10 and the adjusting valve 11 can also be replaced by the automatically lifting elevators 14.

[0061] It is also to be noted that the outer peripheral part of the output shaft of the motor 16 of the elevator 14 is sleeved with a main roller 17, the operation of the motor 16 drives the operation of the main roller 17, the main roller 17 is connected with a slave roller 18 through a synchronous belt 19, a synchronous clamp 20 connects the driven sliding device (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) of the gripper 13 with the synchronous belt 19 (the driven sliding device of the device is small in size and light in weight, and the synchronous belt 19 can easily drive its movement), the driven sliding device moves along with the up and down movement of the synchronous belt 19, and the driven sliding device is internally provided with the pulley 24, the pulley 24 is attached to the connecting plate 25, and is mainly used to reduce the displacement caused by inertia when braking.

[0062] It is to be noted that the supporting plate 15 is a steel plate for providing support for the elevators 14; the lower end of the supporting plate 15 is installed with the motor 16, and the motor 16 provides power for the elevators 14 to lift; one end of the motor 16 is connected with the main roller 17, and the rotation of the motor 16 drives the rotation of the main roller 17; the upper end of the supporting plate 15 is installed with the slave roller 18, the main roller 17 and the slave roller 18 are connected through the synchronous belt 19, 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; one end of the synchronous clamp 20 is provided with a notch, the synchronous belt 19 is installed in the notch of the synchronous clamp 20, and the synchronous clamp 20 is fixedly connected with the synchronous belt 19; the other end of the synchronous clamp 20 is fixedly connected with the moving plate 21, and the up and down movement of the synchronous belt 19 drives the up and down movement of the moving plate 21 through the synchronous clamp 20.

[0063] The connecting rods 22 are connected between the moving plates 21 to fix the moving plates 21; the sliding rods 23 are installed in the moving plates 21, the pulleys 24 are installed on the sliding rods 23, the surfaces of the pulleys 24 can be made of rough sponges; the connecting plates 25 are installed on one side of the supporting plates 15, the surfaces of the connecting plates 25 are coated with anti-skid polyurethane, the pulleys 24 contact with the connecting plates 25 and move on the connecting plates 25, when the elevator 14 stops moving, the friction between the pulleys 24 and the connecting plates 25 can reduce the displacement caused by inertia; the limiting sheets 26 are installed on the moving plates 21, the limiting sheets 26 move with the moving plates 21, when the limiting sheets 26 contact with the upper limiting sensor 27 or the lower limiting sensor 28, the motor 16 automatically changes the rotating direction to avoid damaging the elevator 14; the connecting pieces 29 are installed on the moving plates 21, the connecting pieces 29 fix the moving plates 21 and the fixed plates 30, the fixed plates 30 are provided with threaded holes, the clamps 13 are connected with the threaded holes on the fixed plates 30, the clamps 13 move with the fixed plates 30.

[0064] In one embodiment, as shown in FIG. 13, the clamping body of the clamp 13 is provided with a protective sleeve 31, which comprises a hollow soft tube. That is, the protective sleeve 31 is a hollow soft tube made of soft material (such as PVC) to prevent the clamp 13 from breaking the hollow fiber membrane wire 32 and causing the hollow fiber membrane wire 32 to fall off. Figure 12

[0065] In order to further illustrate the use effect of the present application, the microstructure of the membrane wire end face obtained by using the same hollow fiber membrane wire 32 by blade cutting, the microstructure of the membrane wire end face obtained by immersing the hollow fiber membrane wire 32 into a paper cup stored with liquid nitrogen, and the microstructure of the membrane wire end face obtained by using the device are compared and observed under a scanning electron microscope at magnifications of 1000 times and 30000 times, respectively.

[0066] It can be seen from the electron microscope photos that the end face appearances obtained by different methods are different. The thin wall of the hollow fiber membrane wire 32 obtained by blade cutting is deformed by external pressure, and the end face of the hollow fiber membrane wire 32 is rough, which cannot effectively observe the side hole structure of the hollow fiber membrane wire 32. The membrane wire end face obtained by immersing the hollow fiber membrane wire 32 into a paper cup stored with liquid nitrogen also has a certain degree of deformation, and the inner surface of the side wall of the hollow fiber membrane wire 32 is deformed by extrusion under high magnification, which causes the internal hole microstructure of the hollow fiber membrane wire 32 to be unable to be observed. The membrane wire end face obtained by using the device is smooth, and the internal hole microstructure of the hollow fiber membrane wire 32 can be effectively observed under high magnification.

[0067] ​Therefore, the membrane fiber end face obtained by using the device is more smooth and regular, the microscopic morphology observed under a scanning electron microscope is clearer, and the hollow fiber membrane structure is more conducive to research, and the subsequent hollow fiber spinning process is improved to provide technical support. That is, the end face of the hollow fiber membrane fiber 32 obtained by using the device is more smooth and regular than the end face obtained by using a blade to cut and manually immersing the hollow fiber membrane fiber 32 into a paper cup stored in liquid nitrogen, reducing the damage to the membrane fiber end face, and more conducive to microscopic morphology observation, and the device is simple and safe to operate, and can be popularized and used.

[0068] In addition, it should be noted that the "upper", "lower" and other indications of the position or positional relationship of the device or element are based on the position or positional relationship shown in the drawings, and are only for the convenience of simplifying the description and facilitating understanding, and do not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0069] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. Any combination of all the embodiments provided by the present application is within the protection scope of the present application, and is not described here.

[0070] The device for obtaining the end face of the hollow fiber membrane fiber provided by the present application is described in detail above. The principles and implementation methods of the present application are described by applying specific examples in this paper. The above description of the embodiments is only used to help understand the method and core idea of the present application. It should be pointed out that for ordinary skilled persons in the technical field, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. An apparatus for acquiring an end face of a hollow fiber membrane filament, characterized by, The application relates to a liquid nitrogen container. The container (1) is internally filled with liquid nitrogen; a curved channel (4) is arranged at the lower part of the container (1), the curved channel (4) has a certain curvature radius and is provided with a hollow part, hollow fiber membrane filaments (32) pass through the container (1) along the curved channel (4), the curvature radius of the hollow fiber membrane filaments (32) in the curved channel (4) is the same as that of the curved channel (4), and the liquid nitrogen immerses the hollow part. The curvature radius of the bottom of the curved channel (4) is 55-65 mm.

2. The apparatus for acquiring the end face of a hollow fiber membrane filament according to claim 1, characterized by, 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 liquid level in the container (1) is 3-5 cm.

3. The apparatus for acquiring the end face of a hollow fiber membrane filament according to claim 2, characterized by, The angle between the curved channel (4) and the wall of the container (1) is 25-35 degrees.

4. The apparatus for acquiring the end face of a hollow fiber membrane filament according to claim 3, characterized by, The top of the container (1) is provided with a medicine injection port (2), and the two sides of the container (1) are correspondingly provided with handles (3).

5. The apparatus for acquiring the end face of a hollow fiber membrane filament according to any one of claims 1 to 4, characterized by, The application further comprises clamps (13) and height adjusting devices for adjusting and fixing the positions of the clamps (13), and the two ends of the hollow fiber membrane filaments (32) passing out of the container (1) are respectively clamped by two oppositely distributed clamps (13).

6. The apparatus for acquiring the end face of a hollow fiber membrane filament according to any one of claims 1 to 4, characterized by The height adjusting devices are arranged on the opposite sides of the container (1), and the height adjusting devices are connected with the clamps (13) to drive the clamps (13) to move up and down.

7. The apparatus for acquiring the end face of a hollow fiber membrane filament according to claim 6, characterized by, The height adjusting device comprises two oppositely distributed support bodies (8), a sliding body (10) sliding up and down along the support bodies (8) and an adjusting valve (11), the adjusting valve (11) is installed at one end of the sliding body (10) to fix the sliding body (10) on the support bodies (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 with the threaded hole (12).

8. The apparatus for acquiring the end face of a hollow fiber membrane filament according to claim 7, characterized by, ​ 9. The apparatus for acquiring the end face of a hollow fiber membrane filament according to claim 7, characterized by, The height adjusting device is a lifting machine (14), the lifting machine (14) comprises a support plate (15), a motor (16) arranged at the lower part of the support plate (15), a main roller (17) sleeved on the outer circumferential part of the output shaft of the motor (16), a slave roller (18) arranged at the upper part of the support plate (15), a synchronous belt (19) wound on the outer circumferential part of the main roller (17) and the slave roller (18), a synchronous clamp (20) arranged on the synchronous belt (19), a moving plate (21) connected with the synchronous clamp (20), a connecting rod (22) for connecting two opposite distributed moving plates (21), a sliding rod (23) vertically arranged between the two moving plates (21), a pulley (24) sleeved on the outer circumferential part of the sliding rod (23), a connecting plate (25) arranged at one side of the support plate (15), a limiting sheet (26) arranged on the moving plate (21), a fixing plate (30) for connecting with the holder (13) and a connecting piece (29) for connecting the moving plate (21) and the fixing plate (30). The support plate (15) is provided with an upper limiting sensor (27) and a lower limiting sensor (28), when the limiting sheet (26) contacts with the upper limiting sensor (27) or the lower limiting sensor (28), the motor (16) automatically changes the rotating direction, so as to avoid damaging the lifting machine (14).

10. The apparatus for acquiring the end face of a hollow fiber membrane filament according to claim 6, characterized by, The holder (13) is provided with a protective sleeve (31) on the clamping body, and the protective sleeve (31) comprises a hollow hose.

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