An electrospinning device for the industrial-scale preparation of nanofibers

Abstract

This invention relates to the field of electrospinning technology and discloses an electrospinning device for the industrial-scale preparation of nanofibers. This device includes a liquid supply unit comprising a liquid feeder, a liquid supply pipe connected at one end to the output end of the liquid feeder, and a metering pump connected to the liquid supply pipe; a nozzle unit comprising a spinning nozzle and metal needles disposed on the spinning nozzle; a collection unit disposed circumferentially outside the nozzle unit, comprising a lifting component, a rotating component mounted on the lifting component, and a collection component; and an electric field unit comprising a high-voltage power supply and positive and negative electrode wires correspondingly connected to the positive and negative terminals of the high-voltage power supply. This invention, based on a multi-needle spinning channel arranged in a three-dimensional curved space, can increase the yield of nanofibers per unit space, solving the problem of low yield in other arranged devices. The multi-needle spinning channel arranged in a three-dimensional curved space optimizes the electric field distribution during the spinning process, reduces electric field interference between different needles, and stabilizes the spinning jet.

Description

Technical Field

[0001] This invention relates to the field of electrospinning technology, and more particularly to an electrospinning apparatus for the industrial-scale preparation of nanofibers. Background Technology

[0002] Currently, based on the type and number of spinning needles, solution electrospinning equipment can be divided into two main categories: needleless electrospinning equipment and multi-needle electrospinning equipment. Needleless electrospinning is a continuous spinning method that does not require needles to form Taylor cones. However, due to solvent evaporation, a polymer film accumulates over time, affecting the spinning effect. Furthermore, the rotating electrodes easily cause the spinning solution to splash, wasting the solution and potentially damaging the nanofiber membrane quality. Multi-needle electrospinning technology increases the number of needles in a single-needle electrospinning device to generate a corresponding number of Taylor cones, effectively improving spinning efficiency and enabling mass production of nanofibers. The distribution of multi-needles mainly includes linear, matrix, and annular arrangements. Increasing the number of needles in a single-needle electrospinning device requires increasing the voltage, leading to enhanced mutual interference of the electric field. If the electric field strength of the needles is uneven, the external needle jet will deviate, resulting in unevenly produced nanofibers and affecting the quality of the fiber membrane. Multi-needle electrospinning often encounters problems such as needle blockage, electric field interference, and difficulty in cleaning, which seriously affect fiber yield. The geometry and arrangement of the needles affect the electric field distribution, causing uneven electric field strength and affecting the production quality of nanofibers.

[0003] The invention patent application number 202011163131.3, filed by Yang Yongsheng et al., provides a matrix-type multi-needle electrospinning device to improve the production efficiency of nanofibers. The needles are arranged in a 4×6 two-dimensional matrix, resulting in electric field interference between the needles, making it difficult to stabilize the spinning jet, leading to inconsistent product quality and increased difficulty in needle replacement. Furthermore, the use of multiple liquid supply systems makes it difficult to clean the spinning solution channels and to unify the solution supply speed.

[0004] The invention patent application number 201811114850.9, by Chen Rouxi et al., provides a multi-needle electrospinning device with a uniform electric field distribution to improve the uniformity of fiber membranes and the yield of nanofibers. The needles are distributed in a circular array. The thickness of the fiber membrane at the edge is inconsistent with that at the center. The electric field interference is reduced by increasing the needle spacing. The number of needles is a limiting factor affecting the mass production of electrospun nanofibers, which reduces the production efficiency of nanofibers and makes the spinning device too large.

[0005] In the invention patent application number 202011346997.8, Wang Han et al. provided an industrial electrospinning collection device that uses a machine cloth to collect nanofibers. The machine cloth can only move in parallel. Due to the variation in the arrangement density of spinning needles at different receiving positions, the nanofiber membrane at the edge of the machine cloth is thinner and the nanofiber distribution is uneven, which limits the application range of the nanofiber membrane.

[0006] Overall, the key to developing large-scale electrospinning production equipment lies in increasing the number of spinning needles to generate a corresponding number of Taylor cones, thereby improving the spinning efficiency of nanofibers and achieving mass production. The needles are distributed in one-dimensional linear arrangement and two-dimensional array configurations. Increasing the number of needles in a single-needle electrospinning device causes mutual interference and uneven electric field intensity distribution, leading to unstable spinning jets. This results in inconsistent nanofiber membrane morphology and uneven fiber fineness, thus affecting fiber quality. Furthermore, multi-needle electrospinning devices also suffer from difficulties in needle replacement, cleaning of the liquid supply pipeline, and maintenance. In the electrospinning process, the receiving device is a crucial component for collecting nanofibers. The use of a flat plate receiving device leads to uneven fiber distribution, affecting fiber orientation and structure, and making it difficult to achieve directional fiber alignment or multilayer structures. There is an urgent need to develop electrospinning equipment with stable multi-needle spinning jets, high nanofiber yield per unit space, and the ability to achieve different fiber arrangements and orientations for large-scale nanofiber production. Summary of the Invention

[0007] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0008] In view of the problems existing in the current electrospinning equipment for the industrial preparation of nanofibers, the present invention is proposed.

[0009] Therefore, the purpose of this invention is to provide an electrospinning device for the industrial-scale preparation of nanofibers, which aims to solve the problems of unreasonable needle distribution and arrangement, easy clogging and difficult replacement of needles, difficulty in cleaning solution pipelines, and low continuous production efficiency in existing electrospinning equipment.

[0010] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an electrospinning device for the industrial-scale preparation of nanofibers, the electrospinning device comprising a liquid supply unit, a nozzle unit, a collection unit, and an electric field unit, wherein the liquid supply unit comprises a liquid feeder, a liquid supply pipe connected at one end to the output end of the liquid feeder, and a metering pump connected in the liquid supply pipe; the nozzle unit comprises a spinning nozzle and a metal needle disposed on the spinning nozzle, the end of the liquid supply pipe away from the liquid feeder being connected to the input port of the spinning nozzle; the collection unit is disposed on the circumferential outer side of the nozzle unit, comprising a lifting component, a rotating component mounted on the lifting component, and a collection component connected to the output end of the rotating component and suspended between the support frames; and the electric field unit comprises a high-voltage power supply and positive and negative wires correspondingly connected to the positive and negative terminals of the high-voltage power supply, the end of the positive wire away from the high-voltage power supply being connected to the input port of the spinning nozzle, and the end of the negative wire away from the high-voltage power supply being connected to the collection component.

[0011] As a preferred embodiment of the electrospinning device for the industrial-scale preparation of nanofibers according to the present invention, wherein: the spinning nozzle has a cavity inside the tube body and a needle interface is provided in the side wall of the tube body, and the cavity needle interface is in communication with the cavity; the two ends of the spinning nozzle tube body are rounded; the metal needle is fitted and installed in the needle interface.

[0012] As a preferred embodiment of the electrospinning device for the industrial preparation of nanofibers according to the present invention, the needle interface is arranged in multiple groups at equal intervals along the axial direction of the spinning nozzle, and each group contains a number of needles, which are evenly distributed with equal arc.

[0013] In a preferred embodiment of the electrospinning apparatus for the industrial-scale preparation of nanofibers according to the present invention, the installation spacing between adjacent metal needles is ~.

[0014] As a preferred embodiment of the electrospinning device for the industrial-scale preparation of nanofibers according to the present invention, the lifting component includes a support base, a threaded rod disposed on the top of the support base, a threaded drive assembly disposed on the two threaded rods, and a bearing plate mounted on the two threaded drive assemblies.

[0015] As a preferred embodiment of the electrospinning device for the industrial-scale preparation of nanofibers according to the present invention, the rotating component includes a rotary motor installed in the middle of the support plate and a connecting rod disposed on the output shaft of the rotary motor.

[0016] As a preferred embodiment of the electrospinning device for the industrial-scale preparation of nanofibers according to the present invention, the collecting component includes a support ring, a transmission roller disposed in the inner and outer sidewalls of the support ring, a conveyor belt in rolling contact with the transmission roller, and a metal collecting mesh disposed on the surface of the conveyor belt.

[0017] As a preferred embodiment of the electrospinning device for the industrial-scale preparation of nanofibers according to the present invention, wherein: the axial ring of the support ring has a notch, and the inner and outer sidewalls of the support ring are provided with mounting grooves; the transmission rollers are arranged at both ends of the mounting grooves in pairs and are evenly distributed in several groups.

[0018] In a preferred embodiment of the electrospinning apparatus for the industrial-scale preparation of nanofibers according to the present invention, the edge of the conveyor belt is rolled and held between a pair of drive rollers, and the conveyor belt passes through the notch of the support ring, connecting the inside and outside of the support ring.

[0019] As a preferred embodiment of the electrospinning device for the industrial-scale preparation of nanofibers according to the present invention, wherein: a slot is provided on the side wall of the conveyor belt, and the metal collecting net is detachably connected to the surface of the conveyor belt through the slot.

[0020] The beneficial effects of this invention are:

[0021] 1. A multi-needle spinning tube based on a three-dimensional curved surface arrangement can increase the yield of nanofibers per unit space and solve the problem of low yield in other arrangements.

[0022] 2. The multi-needle spinning tube arranged in a three-dimensional curved space optimizes the electric field distribution during the spinning process, reduces electric field interference between different needles, and stabilizes the spinning jet.

[0023] 3. The lifting and rotating collection method improves the uniformity of the nanofiber membrane through lifting and rotating motion, ensures the consistency of nanofiber diameter, and reduces the influence of receiving distance on nanofiber diameter.

[0024] 4. By changing the rotation speed of the collection method, oriented nanofibers can be prepared, which can form fibers with specific arrangements and morphologies, thus expanding the application range of nanofiber membranes. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0026] Figure 1 This is a schematic diagram of the overall structure of the electrospinning device for the industrial-scale preparation of nanofibers according to the present invention.

[0027] Figure 2 This is a schematic diagram of the working structure of the nozzle unit and the collection unit of the electrospinning device for the industrial preparation of nanofibers according to the present invention.

[0028] Figure 3 This is a schematic diagram of the internal structure of the nozzle unit of the electrospinning device for the industrial-scale preparation of nanofibers according to the present invention.

[0029] Figure 4 This is a schematic diagram of the collection unit structure of the electrospinning device for the industrial-scale preparation of nanofibers according to the present invention.

[0030] Figure 5 This is a schematic diagram of the specific structure of the collecting component of the electrospinning device for the industrial-scale preparation of nanofibers according to the present invention.

[0031] Figure 6 This is a schematic diagram of the radial cross-sectional planar structure of the collecting component of the electrospinning device for the industrialization of nanofibers according to the present invention. Detailed Implementation

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0035] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0036] Example 1

[0037] Reference Figure 1 and2 This first embodiment of the invention provides an electrospinning apparatus for the industrial-scale preparation of nanofibers. The electrospinning apparatus includes a liquid supply unit 100, a nozzle unit 200, a collection unit 300, and an electric field unit 400. The liquid supply unit 100 contains the prepared spinning solution and presses it into the nozzle unit 200. The nozzle unit 200 uses a specific needle to eject the spinning solution as Taylor cone droplets under the action of an electric field, thus solidifying it into fibers. The collection unit 300 collects the solidified fibers. The electric field unit 400 establishes a working voltage between the nozzle unit 200 and the collection unit 300 to stretch the spinning solution.

[0038] Specifically, the liquid supply unit 100 includes a liquid supply device 101, a liquid supply pipe 102 connected at one end to the output end of the liquid supply device 101, and a metering pump 103 connected in the liquid supply pipe 102. The liquid supply device 101 is used to hold the spinning solution and can be used to pressurize the spinning solution. The liquid supply pipe 102 is used to output the spinning solution in the liquid supply device 101, specifically to the spinning nozzle 201. The metering pump 103 is used to pump the spinning solution and can also adjust the flow rate of the spinning solution, thereby achieving adjustment of the thickness of the nanofibers.

[0039] The nozzle unit 200 includes a spinning nozzle 201 and a metal needle 202 disposed on the spinning nozzle 201. One end of the liquid supply pipe 102 away from the liquid supply device 101 is connected to the inlet 201a of the spinning nozzle 201. The spinning nozzle 201 is used for the installation of multiple needles and the supply of solution, while the metal needle 202 is a key device for electrospinning and is used for spraying the spinning solution.

[0040] The collection unit 300 is located on the circumferential outer side of the nozzle unit 200. It includes a lifting member 301, a rotating member 302 mounted on the lifting member 301, and a collection member 303 connected to the output end of the rotating member 302 and suspended between the support frame 301. The lifting member 301 is used for supporting the rotating member 302 and the collection member 303 and for height adjustment, while the rotating member 302 is used for rotation adjustment of the collection member 303. The collection member 303 is used to collect the formed fibers.

[0041] The electric field unit 400 includes a high-voltage power supply 401 and positive and negative wires 402 and 403 respectively connected to the positive and negative terminals of the high-voltage power supply 401. The end of the positive wire 402 away from the high-voltage power supply 401 is connected to the inlet 201a of the spinning nozzle 201, and the end of the negative wire 403 away from the high-voltage power supply 401 is connected to the collecting element 303. The high-voltage power supply 401 is used for power supply, while the positive and negative wires 402 and 403 are used to apply voltage during solution spinning to form an electrostatic field, thereby promoting the stretching process and forming qualified fiber filaments.

[0042] During use, after connecting the electrospinning device and turning on the high-voltage power supply 401, a working voltage will be formed between the nozzle unit 200 and the collection unit 300. The prepared spinning solution is loaded into the liquid supply device 101 and pumped into the spinning nozzle 201 by the metering pump 103. When the voltage rises to a certain value, the droplets in the metal needle 202 generate charges. Under the stretching action of the electric field force, the spinning solution forms Taylor cone droplets and is ejected. After the stretched jet undergoes solvent evaporation and jet splitting, the diameter decreases sharply. The jet that reaches the collection device 303 is basically solidified into fibers, and the charge it carries will also be quickly dissipated through grounding. Cross-distributed and randomly arranged nanofibers will be formed on the collection device 303.

[0043] Example 2

[0044] Reference Figures 2-6 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the spinning nozzle 201 in this embodiment adopts a brand-new three-dimensional curved surface spatial arrangement, which greatly optimizes the spatial electric field distribution between each needle, ensuring the jet density of the spinning equipment and reducing the electric field interference between different needle parts.

[0045] Specifically, the spinning nozzle 201 has a cavity 201b inside its tube body, and a needle interface 201c is provided in the side wall of the tube body, and the cavity needle interface 201c is in communication with the cavity 201b; the two ends of the spinning nozzle 201 are rounded at both ends of the tube body; and the metal needle 202 is fitted and installed in the needle interface 201c.

[0046] The needle interface 201c is arranged in multiple groups at equal intervals along the axis of the spinning nozzle 201, and each group contains 4 needles, which are evenly distributed with equal arc.

[0047] The installation spacing between adjacent metal needles 202 is 20-30mm.

[0048] Furthermore, the spinning nozzle 201 is a capsule-shaped metal tubular structure with a hollow interior, serving as a cavity 201b to hold the high-pressure-input spinning solution and acting as a spinning solution channel to continuously supply the spinning solution to each needle interface 201c. The spinning solution is obtained from the supply pipe 102 through an input port 201a on the side wall of the nozzle end. The circular, hollow structure facilitates the spatially symmetrical array distribution of multiple needles. Compared to one-dimensional linear arrangements and two-dimensional arrays, it increases the number of spinning needles within a unit curved surface space, effectively improving jet density, increasing nanofiber production efficiency, and reducing equipment footprint. The smooth transition at both ends of the hollow metal tube reduces the electric field strength at the edge needles and improves the uniformity of the electric field distribution at the needles. All components are connected by standard threads, facilitating disassembly and solving the problems of easy clogging in the needle area, difficulty in needle replacement, and difficulty in cleaning the pipes.

[0049] Furthermore, the needle interface 201c is arranged in multiple sets in the circumferential sidewall of the spinning nozzle 201, with multiple sets distributed along the radial arc. In this scheme, four sets are preferred, distributed at 90-degree intervals, so the axial view is a cross shape.

[0050] Each needle interface 201c is fitted with a metal needle 202, and the two can be assembled using standard threads. With the installation method described in this embodiment, the increased spacing between the needles reduces the interaction of the electric fields between them, and consequently increases the electric field strength at each needle tip. When the needle spacing increases to a certain extent, the electric field strength distribution of each needle approaches that of a single needle. While a larger needle spacing is beneficial for obtaining a working electric field with greater and more uniform electric field strength, it results in lower jet density, which is detrimental to improving production efficiency. Therefore, after multiple experimental verifications, the preferred needle spacing in this embodiment is 20-30 mm.

[0051] After the spinning solution is sprayed to form fibers, a collection unit 300 is required for better collection.

[0052] Specifically, the lifting component 301 includes a support base 301a, a threaded rod 301b disposed on the top of the support base 301a, a threaded drive assembly 301c disposed on the two threaded rods 301b, and a bearing plate 301d mounted on the two threaded drive assemblies 301c. The lifting component 301 as a whole is used to generate lifting action. The support base 301a, threaded rod 301b, threaded drive assembly 301c, and bearing plate 301d represent a common lifting structure, and this solution does not impose excessive limitations; existing lifting structural components and equipment can be used.

[0053] The rotating component 302 includes a rotary motor 302a mounted in the middle of the support plate 301d and a connecting rod 302b disposed on the output shaft of the rotary motor 302a. Similar to the lifting component 301, this rotating component 302 is mainly used to drive the collecting component 303 to rotate. The rotary motor 302a and the connecting rod 302b are mounted in the middle of the support plate 301d. Similarly, this can be achieved using existing technology, and will not be described in detail here.

[0054] The collecting component 303 includes a support ring 303a, a transmission roller 303b disposed in the inner and outer side walls of the support ring 303a, a conveyor belt 303c that rolls in contact with the transmission roller 303b, and a metal collecting net 303d disposed on the surface of the conveyor belt 303c.

[0055] The axial ring of the support ring 303a has a notch K, and the inner and outer sidewalls of the support ring 303a are provided with mounting grooves C; the transmission rollers 303b are arranged at both ends of the mounting grooves C in pairs and are evenly distributed in several groups.

[0056] The edge of the conveyor belt 303c is rolled and held between a pair of drive rollers 303b, and the conveyor belt 303c passes through the notch K of the support ring 303a, connecting the inside and outside of the support ring 303a.

[0057] The side wall of the conveyor belt 303c is provided with a slot A, and the metal collection net 303d is detachably connected to the surface of the conveyor belt 303c through the slot A.

[0058] Furthermore, in the collecting component 303, the support ring 303a is the main structure, and the inner and outer side walls of the ring are formed with mounting grooves C for mounting the conveyor roller 303b. The transmission roller 303b is used for the rolling transmission of the transmission belt 303c. The metal collecting mesh 303d is installed on the surface of the transmission belt 303c to facilitate the collection of the cured fiber filaments.

[0059] One end of the connecting rod 302b, away from the rotary motor 302a, is connected to the top side wall of the support ring 303a, suspending the support ring 303a and driving the rotation of the collecting component 303a. The notch K in the support ring 303a allows the conveyor belt 303c installed inside and outside the ring to be a continuous, single-unit structure. This allows the metal collecting mesh 303d outside the ring, which does not carry fiber filaments, to be transferred inside the ring, while the metal mesh inside carrying fiber filaments of a specified thickness is transferred outside the ring. This achieves uninterrupted continuous production, significantly improving the production efficiency of nanofibers; simultaneously, it greatly reduces the clogging of metal needles caused by stopping the spinning solution propulsion.

[0060] It should be noted that the drive roller 303b can be driven manually or electrically, and no specific limitation is made here. The metal collecting mesh 303d is detachably mounted on the surface of the conveyor belt 303c through the form of a slot A, which can easily remove and collect the collected fibers, facilitating the collection process.

[0061] Under the action of the lifting component 301, the metal collecting mesh 303d can move vertically, causing the nanofibers produced by needles of different heights to overlap and arrange. The rotation of the metal collecting mesh 303d in the horizontal direction will cause the nanofibers produced by needles of the same height but different horizontal positions to overlap and arrange, improving the uniformity of nanofibers, solving the differences in nanofibers spun by different needles, and making the properties of the fiber membrane stable and controllable.

[0062] Example 3

[0063] Reference Figures 1-6 This is the third embodiment of the present invention, which uses the electrospinning apparatus described in embodiments 1 and 2 above to produce nanofibers. The specific operation is as follows:

[0064] 1. Equipment Assembly and Debugging: Assemble the liquid supply unit 100, nozzle unit 200, collection unit 300, and electric field unit 400 into a complete electrospinning device. Install the metal needle 202 into the needle interface 201a in the side wall of the spinning nozzle 201. The inner diameter of the metal needle 202 is 0.2-20mm to ensure that the spinning solution can flow stably to the needle tip.

[0065] Fix the spinning nozzle 201 at the center position inside the collecting component 303, ensuring that all metal needles 202 are at the same distance from the metal receiving net 303d, and control the distance between the needles and the receiving net to be 5-30cm. Adjust the supply pipeline of the spinning solution to ensure that the flow rate of the spinning solution can be stably controlled, thereby achieving precise adjustment of the nanofiber thickness.

[0066] Connect the high-voltage power supply 401 and conduct preliminary voltage and flow rate tests to ensure that the basic operation of the equipment meets the spinning requirements.

[0067] 2. Preparation of the spinning solution: Select a suitable polymer for electrospinning, such as polyvinyl alcohol (PVA), polyacrylonitrile (PAN), polyvinylidene fluoride (PVDF), polyurethane (TPU), polymethyl methacrylate (PMMA), polylactic acid-glycolic acid copolymer (PLGA), and polycaprolactone (PCL). Adjust the concentration, viscosity, and conductivity of the polymer solution according to the desired nanofiber characteristics. Use appropriate solvents, such as dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and tetrahydrofuran (THF), to dissolve the polymer and stir thoroughly for 12-24 hours until a homogeneous spinning solution is formed.

[0068] 3. Equipment Operation and Parameter Setting: Start the metering pump 103 and adjust it to the predetermined flow rate to ensure the spinning solution is delivered to the spinning nozzle 201 and metal needle 202 at a stable speed, ensuring the flow rate of a single needle is stable at 0.5-2.0 ml / h. Simultaneously, adjust the voltage of the high-voltage power supply 401 from 5-30 kV, gradually increasing it until a stable electric field is generated, ensuring a uniform working voltage is formed between the metal needle 202 and the collecting element 303. By observing the shape change of the droplets at the metal needle 202, determine whether the voltage has reached the critical value and formed a stable Taylor cone.

[0069] The spinning solution is ejected from the metal needle 202 under the action of an electric field. By adjusting the voltage and flow rate, the diameter and morphology of the nanofibers can be finely adjusted.

[0070] 4. Collection Unit Operation: The lifting component 301 and rotating component 302 are used to control the collecting component 303, adjusting its vertical position and horizontal rotation speed to achieve uniform distribution of nanofibers on the metal collecting mesh 303d. By changing the vertical movement range of the collecting component 303, the uniformity of the fiber layer can be controlled; by adjusting the rotation speed, the orientation of the fibers can be affected, thereby preparing nanofiber membranes with specific orientation structures. After the inner metal mesh collects a nanofiber membrane of a specified thickness, the conveyor belt 303c is controlled to rotate, transferring the inner metal mesh to the outer layer, facilitating the collection of nanofiber membranes. Simultaneously, the outer metal mesh enters the interior and continues to collect nanofibers. The repeated circulation of the inner and outer metal meshes enables batch collection of nanofiber membranes. The lifting range is 0-6 cm, and the lifting speed range is 0-100 cm / min. The horizontal rotation speed range is 0-1000 rpm, and the conveyor belt speed is 0-10 m / min.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An electrospinning apparatus for the industrial-scale preparation of nanofibers, characterized in that: include, The liquid supply unit (100) includes a liquid feeder (101), a liquid supply pipe (102) with one end connected to the output end of the liquid feeder (101), and a metering pump (103) connected to the liquid supply pipe (102). A nozzle unit (200) includes a spinning nozzle (201) and a metal needle (202) disposed on the spinning nozzle (201), wherein one end of the liquid supply pipe (102) away from the liquid feeder (101) is connected to the inlet (201a) of the spinning nozzle (201); and, A collection unit (300), disposed circumferentially outside the nozzle unit (200), includes a lifting member (301), a rotating member (302) mounted on the lifting member (301), and a collection member (303) connected to the output end of the rotating member (302) and suspended between the lifting members (301); and, An electric field unit (400) includes a high-voltage power supply (401) and a positive electrode wire (402) and a negative electrode wire (403) connected to the positive and negative electrodes of the high-voltage power supply (401), respectively. The end of the positive electrode wire (402) away from the high-voltage power supply (401) is connected to the input port (201a) of the spinning nozzle (201), and the end of the negative electrode wire (403) away from the high-voltage power supply (401) is connected to the collecting element (303). The spinning nozzle (201) has a cavity (201b) inside its tube body and a needle port (201c) is provided in the side wall of the tube body, and the needle port (201c) is in communication with the cavity (201b). The spinning nozzle (201) has rounded transitions at both ends of its tube body along the axial direction. The metal needle (202) is fitted into the needle interface (201c); The needle interface (201c) is arranged in multiple groups at equal intervals along the axial direction of the spinning nozzle (201), and each group contains 4 needles, which are evenly distributed with equal arc. The installation spacing between adjacent metal needles (202) is 20~30mm; The lifting component (301) includes a support base (301a), a threaded rod (301b) disposed on the top of the support base (301a), a threaded drive assembly (301c) disposed on the two threaded rods (301b), and a bearing plate (301d) mounted on the two threaded drive assemblies (301c). The rotating component (302) includes a rotary motor (302a) mounted in the middle of the support plate (301d) and a connecting rod (302b) disposed on the output shaft of the rotary motor (302a). The collecting component (303) includes a support ring (303a), a transmission roller (303b) disposed in the inner and outer side walls of the support ring (303a), a conveyor belt (303c) in rolling contact with the transmission roller (303b), and a metal collecting mesh (303d) disposed on the surface of the conveyor belt (303c). The axial ring of the support ring (303a) has a notch (K), and the inner and outer sidewalls of the support ring (303a) are provided with mounting grooves (C). The transmission rollers (303b) are arranged at both ends of the mounting groove (C) in pairs and are evenly distributed in several groups. The edge of the conveyor belt (303c) is rolled and held between the pairs of drive rollers (303b), and the conveyor belt (303c) passes through the notch (K) of the support ring (303a), communicating between the inside and outside of the support ring (303a); The side wall of the conveyor belt (303c) is provided with a slot (A), and the metal collecting net (303d) is detachably connected to the surface of the conveyor belt (303c) through the slot (A).

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