Electrostatic centrifugal nanofiber membrane processing device

Abstract

The invention discloses an electrostatic centrifugal nanofiber membrane processing device, and aims to overcome the defects that a nanofiber membrane is poor in processing thickness uniformity and small in width, and the phenomenon that fibers are blown disorderly exists in the drying process. The device comprises a spinning unit and a drying unit, the spinning unit comprises a spinning box and a spinning nozzle, an electrode plate and a sliding seat moving left and right are mounted in the spinning box, the spinning nozzle is rotatably mounted on the sliding seat and connected with positive voltage, and the electrode plate is grounded or connected with negative voltage; the drying unit comprises a drying oven and an exhaust fan, an air inlet of the exhaust fan is connected to the top of the drying oven, and an air outlet of the exhaust fan is connected with a solvent collector; base cloth is arranged above the electrode plate, a nanofiber membrane raw material sprayed by a spinning nozzle is deposited on the base cloth, and then the base cloth is forwards conveyed to a drying unit to be dried. According to the device, the uniformity of the nanofiber membrane can be improved, the width of the produced nanofiber membrane can be increased, and the phenomenon that fibers on the surface of the nanofiber membrane are blown disorderly by hot air due to wind blowing can be prevented.

Description

Technical Field

[0001] This invention relates to nanofiber membrane processing technology, and more specifically, to an electrostatic centrifugal nanofiber membrane processing apparatus. Background Technology

[0002] Centrifugal spinning, electrospinning, and air-jet spinning are currently the three mainstream industrialized nanofiber spinning technologies. Currently, there are no electrostatic centrifugal spinning production lines on the market. Simple electrospinning requires high voltage, often exceeding 15 kV, and industrial production lines exceed 30 kV, which can easily ionize air, posing electrical safety hazards. Existing nanofiber membrane production lines mostly rely on forced-air heating for drying; however, hot air blowing onto the fiber membrane can disrupt the fibers on the surface, affecting product quality. Chinese Patent Publication No. CN211947473U discloses a modular electrospinning continuous nonwoven fabric production line, including base fabric unwinding, traction, spinning, drying, and winding devices. The liquid supply cart and constant temperature and humidity chamber are independent of the equipment and are driven by an air shaft and stepper motor, achieving flexible equipment layout and efficient operation. This device is an electrospinning production line, not an electrostatic centrifugal spinning production line. Furthermore, the drying chamber after spinning still uses traditional forced-air drying. Hot air blowing onto the fiber membrane will disrupt the fibers on the surface of the membrane, and the production line lacks a solvent recovery system, resulting in solvent waste. Summary of the Invention

[0003] To overcome the above shortcomings, the present invention provides an electrostatic centrifugal nanofiber membrane processing device, which can improve the uniformity of nanofiber membranes and increase the width of nanofiber membranes produced, prevent the phenomenon of fibers on the surface of the fiber membrane being disordered by hot air due to wind blowing, and realize solvent recovery.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an electrostatic centrifugal nanofiber membrane processing device, comprising a spinning unit and a drying unit. The spinning unit includes a spinning box and a spinneret. An electrode plate and a sliding block that moves left and right are installed inside the spinning box. The spinneret is rotatably mounted on the sliding block and is connected to a positive voltage. The electrode plate is grounded or connected to a negative voltage. The drying unit includes an oven and an exhaust fan. The air inlet of the exhaust fan is connected to the top of the oven, and the air outlet of the exhaust fan is connected to a solvent collector. A base fabric is laid above the electrode plate. The spinneret sprays nanofiber membrane raw material onto the base fabric, which is then conveyed forward to the drying unit for drying.

[0005] During nanofiber membrane processing, the base fabric is conveyed forward via unwinding and rewinding. The base fabric first passes through the spinning unit, where the spinneret rotates at high speed. The polymer solution raw material for the nanofiber membrane is ejected outwards under centrifugal force. Since the spinneret is connected to a positive voltage, and the electrode plates are grounded or connected to a negative voltage, a potential difference exists between the spinneret and the electrode plates, forming an electric field. The ejected nanofiber membrane raw material carries a positive charge and, under the influence of the electric field, is stretched and refined, moving towards the electrode plates and depositing onto the surface of the base fabric to form a nanofiber membrane. The spinneret is rotatably mounted on a slide, which can move left and right. Therefore, the nanofiber membrane raw material ejected from the spinneret can form a wide-width nanofiber membrane, which is beneficial for improving the uniformity of the nanofiber membrane.

[0006] After the nanofiber membrane is deposited on the base fabric surface, it is conveyed forward to the drying unit. The high temperature inside the oven dries the nanofiber membrane, and the exhaust fan operates to draw air from the top of the oven. Compared with forced-air heating, this prevents the nanofiber membrane surface fibers from being disordered by hot air. The volatile solvent is drawn in by the exhaust fan and transported to a solvent collector for collection.

[0007] Preferably, a rotating rod driven by a centrifugal motor is installed on the slide, and the spinneret is fixedly connected to the rotating rod; a screw driven by a mobile motor is installed inside the spinning box, and the slide is adapted to the screw.

[0008] A centrifugal motor drives a rotating rod to rotate, thereby rotating the spinneret. A movable motor drives a screw to rotate, which, through a threaded connection with a slide, moves the slide left and right, thus moving the spinneret left and right.

[0009] Preferably, heating wires and drive rollers are installed inside the drying oven, with the drive rollers supporting the base fabric.

[0010] The heating wire heats the inside of the oven to dry the nanofiber membrane, while the drive rollers support the base fabric, allowing it to spread out and ensuring both effective drying and stable transport of the base fabric.

[0011] Preferably, an evaporator is installed inside the solvent collector.

[0012] The evaporator absorbs heat from the airflow to cool it down, thereby condensing the gaseous solvent into droplets for collection.

[0013] Preferably, the spinneret is provided with a liquid storage chamber and a fiber outlet hole. The liquid storage chamber is filled with nanofiber membrane raw material liquid, and the nanofiber membrane raw material liquid is ejected from the fiber outlet hole.

[0014] The polymer solution raw material for processing nanofiber membranes is stored in the liquid storage chamber of the spinneret. During the rotation of the spinneret, it is subjected to centrifugal force, and the nanofiber membrane raw material liquid is ejected from the exit hole and deposited on the base fabric under the action of electric field force.

[0015] Preferably, the solvent collector is equipped with an air inlet and an air outlet, the air inlet is connected to the air outlet of the exhaust fan, and an air outlet is provided at the filament outlet, with the air outlet connected to the air outlet.

[0016] The airflow from the solvent collector is discharged outward through the air outlet at the filament outlet. The impact of the airflow helps to improve the stretching and refining effect on the ejected nanofiber membrane material, further drawing the nanofiber membrane material into filaments, improving the filament output effect, and thus improving the uniformity of the nanofiber membrane. Moreover, the residual solvent in the airflow is sprayed into the spinning box and then extracted and recycled by the exhaust fan, avoiding the airflow being directly discharged from the solvent collector, which would affect the environment and waste solvent.

[0017] Preferably, a nozzle and a lifting ring are installed on the spinneret. A universal ball head is provided at one end of the nozzle, which is mounted on the spinneret in a omnidirectional manner. An adjusting rod is hinged between the lifting ring and the nozzle. The cavity inside the nozzle forms a filament outlet hole, from which the nanofiber membrane raw material liquid is ejected. The lifting ring moves up and down to adjust the tilt angle of the nozzle.

[0018] The nozzle can be rotated to adjust its tilt angle, thereby adjusting the spray range of the nanofiber membrane material to meet different production needs. During adjustment, the lifting ring moves up and down, pushing the nozzle to rotate via the adjusting rod, thus adjusting the nozzle's tilt angle.

[0019] As a preferred option, a pressure accumulator is installed on the pipeline between the exhaust fan and the solvent collector.

[0020] The accumulator chamber can improve the ventilation effect of the exhaust fan.

[0021] Preferably, an unwinding unit is provided at the front of the spinning unit and a winding unit is provided at the rear of the drying unit. The unwinding unit includes an unwinding wheel and the winding unit includes a winding wheel. The two ends of the base fabric are connected to the unwinding wheel and the winding wheel, respectively.

[0022] After the base fabric is unwound from the unwinding wheel, it passes through the spinning unit and the drying unit in sequence, and is finally wound up on the winding wheel.

[0023] Preferably, two spinning units are provided, and the base fabric passes through the two spinning units in sequence to achieve secondary deposition of nanofiber membrane raw materials.

[0024] By setting up two spinning units, it is possible to process thicker nanofiber membranes.

[0025] Compared with the prior art, the beneficial effects of the present invention are: (1) The spinneret is rotated and mounted on the slide, and the slide can move left and right, so the nanofiber membrane material sprayed by the spinneret can form a wide nanofiber membrane, which is beneficial to improving the uniformity of the nanofiber membrane; (2) The exhaust fan works to exhaust air from the top of the oven, which, compared with the blower heating, can prevent the phenomenon that the fibers on the surface of the nanofiber membrane are blown away by the hot air due to the wind. The evaporated solvent is drawn in by the exhaust fan and transported to the solvent collector for collection; (3) The spray angle of the nanofiber membrane material can be adjusted, thereby adjusting the spray range of the nanofiber membrane material to adapt to different production needs; (4) The airflow output from the solvent collector is discharged outward through the air outlet provided at the filament outlet. The impact of the airflow is beneficial to improving the stretching and refining effect of the sprayed nanofiber membrane material, so that the nanofiber membrane material is further drawn into filamentous fibers, improving the filament output effect, and thus improving the uniformity of the nanofiber membrane. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention.

[0027] Figure 2 This is a diagram of the internal structure of the present invention.

[0028] Figure 3 This is a structural diagram of the solvent collector of the present invention.

[0029] Figure 4 This is a structural diagram of the spinneret of Embodiment 1 of the present invention.

[0030] Figure 5 This is a structural diagram of the spinneret in Embodiment 2 of the present invention.

[0031] Figure 6 This is an enlarged view of the wire outlet hole in Embodiment 2 of the present invention.

[0032] Figure 7 This is a structural diagram of the spinneret in Embodiment 3 of the present invention.

[0033] Figure 8 This is an enlarged view of the wire outlet hole in Embodiment 3 of the present invention.

[0034] Figure 9 This is a structural diagram of the spinneret in Embodiment 4 of the present invention.

[0035] Figure 10 This is an enlarged view of the wire outlet hole in Embodiment 4 of the present invention.

[0036] In the diagram: 1. Spinning unit, 2. Drying unit, 3. Unwinding unit, 4. Rewinding unit, 5. Unwinding roller, 6. Rewinding roller, 7. Spinning box, 8. Spinneret, 9. Electrode plate, 10. Slide, 11. Centrifugal motor, 12. Rotating rod, 13. Moving motor, 14. Screw, 15. Support plate, 16. Vertical plate, 17. Clearance groove, 18. Guide rail, 19. Guide groove, 20. Positioning slide plate, 21. Drying oven, 22. Exhaust fan, 23. Solvent collector, 24. Heating wire, 25. Drive roller, 26. Window, 27. Accumulator, 28. Evaporator, 29. Exhaust valve 30. Liquid pipe, 31. Valve, 32. Air inlet nozzle, 33. Air outlet nozzle, 34. Extension sleeve, 35. Liquid storage chamber, 36. Wire outlet hole, 37. Material loading hole, 38. Sealing plug, 39. Spray pipe, 40. Lifting ring, 41. Universal ball head, 42. Adjusting rod, 43. Mounting hole, 44. Mounting groove, 45. Adjusting ring, 46. Positioning block, 47. Ring groove, 48. Slide groove, 49. Limiting pin, 50. Air outlet, 51. Vent seat, 52. Vent ring cavity, 53. Vent hole, 54. Flow hole, 55. Vent connector, 56. Air inlet connector, 57. Nozzle. Detailed Implementation

[0037] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1: An electrostatic centrifugal nanofiber membrane processing device (see...) Figures 1 to 4 The system includes a spinning unit 1 and a drying unit 2. An unwinding unit 3 is located at the front of the spinning unit 1, and a winding unit 4 is located at the rear of the drying unit 2. The unwinding unit 3 includes an unwinding wheel 5, and the winding unit 4 includes a winding wheel 6. The two ends of the base fabric are connected to the unwinding wheel 5 and the winding wheel 6, respectively. The winding wheel 6 is driven by a motor. After the base fabric is unwound from the unwinding wheel 5, it passes through the spinning unit 1 and the drying unit 2 in sequence, and finally is wound up on the winding wheel 6.

[0038] The spinning unit 1 includes a spinning box 7 and a spinneret 8. An electrode plate 9 and a sliding block 10 that moves left and right are installed inside the spinning box 7. The spinneret 8 is rotatably mounted on the sliding block 10 and is connected to a high-voltage positive voltage. The electrode plate 9 is grounded or connected to a high-voltage negative voltage. A rotating rod 12 driven by a centrifugal motor 11 is installed on the sliding block 10, and the spinneret 8 is fixedly connected to the rotating rod 12. A screw 14 driven by a moving motor 13 is installed inside the spinning box 7, and the sliding block 10 is adapted to the screw 14. A support plate 15 is installed inside the spinning box 7, and two upright plates 16 are set on the support plate 15. Two screws 14 are rotatably connected between the two upright plates 16, and a transmission belt connects the two screws 14. The moving motor 13 is mounted on one of the upright plates 16, and the output shaft of the moving motor 13 is fixedly connected to one of the screws 14. The slide block 10 includes a first seat and a second seat connected together. Both the first and second seats have threaded holes, which are threaded to two screw rods 14. A rotating rod 12 is rotatably mounted on the first seat, and a centrifugal motor 11 is mounted on the second seat. A transmission belt connects the output shaft of the centrifugal motor 11 and the rotating rod 12. A clearance groove 17 is provided on the support plate 15, and two parallel guide rails 18 are mounted on the support plate 15. Guide grooves 19 are provided on the guide rails 18, and a positioning slide plate 20 is slidably connected between the two guide grooves 19. The rotating rod 12 is rotatably connected to the positioning slide plate 20, and passes through the clearance groove 17. The moving motor 13 drives the two screw rods 14 to rotate, thereby achieving synchronous sliding of the first and second seats.

[0039] The drying unit 2 includes an oven 21 and an exhaust fan 22. The air inlet of the exhaust fan 22 is connected to the top of the oven 21, and the air outlet of the exhaust fan 22 is connected to a solvent collector 23. Heating wires 24 and drive rollers 25 are installed inside the oven 21, with the drive rollers 25 supporting the base fabric. The heating wires 24 are installed on the inner wall of the oven 21. The drive rollers 25 are positioned above the electrode plate 9. Long, narrow windows 26 are provided on both the front and rear sides of the oven 21 to facilitate the entry and exit of the base fabric. The base fabric is laid above the electrode plate 9, and nanofiber membrane raw materials are ejected from the spinneret 8 and deposited onto the base fabric. The base fabric is then conveyed forward to the drying unit 2 for drying.

[0040] A pressure accumulator 27 is installed on the pipeline between the exhaust fan 22 and the solvent collector 23. The pressure accumulator 27 improves the exhaust effect of the exhaust fan 22. An evaporator 28 is installed inside the solvent collector 23. A drain pipe 29 is connected to the bottom of the solvent collector 23, and a valve 30 is installed on the drain pipe 29. An air inlet 31 and an air outlet 32 ​​are provided on the top of the solvent collector 23. An extension sleeve 33 is provided inside the solvent collector 23. The upper end of the extension sleeve 33 is connected to the top of the solvent collector 23, and a gap is provided between the lower end of the extension sleeve 33 and the bottom of the solvent collector 23. Evaporator 28 pipelines are provided inside and around the extension sleeve 33. The air inlet 31 is connected to the extension sleeve 33, and the air outlet 32 ​​is located on the periphery of the extension sleeve 33.

[0041] The spinneret 8 is provided with a liquid storage chamber 34 and a fiber outlet 35. The liquid storage chamber 34 is filled with nanofiber membrane raw material liquid, which is ejected from the fiber outlet 35. The top of the spinneret 8 is fastened to the rotating rod 12. The top of the spinneret 8 is provided with a loading hole 36, which facilitates the loading of nanofiber membrane raw material liquid. The loading hole 36 is tightly connected to a sealing plug 37. The fiber outlet 35 is located at the bottom of the spinneret 8, and several fiber outlet 35s are evenly distributed circumferentially. The number of spinning units 1 is selected according to the thickness of the nanofiber membrane to be processed. A single spinning unit 1 or multiple spinning units 1 can be set. In this embodiment, two spinning units 1 are set, and the base fabric passes through the two spinning units 1 in sequence to achieve secondary deposition of nanofiber membrane raw material. The number of drying units 2 is selected according to the thickness of the nanofiber membrane to be dried. A single drying unit 2 or multiple drying units 2 can be set. In this embodiment, one drying unit 2 is set.

[0042] During nanofiber membrane processing, the base fabric is conveyed forward through unwinding and rewinding. After being unwound by the unwinding wheel 5, the base fabric first passes through the spinning unit 1. The spinning unit 1 is equipped with support rollers to support the base fabric and facilitate its conveying. The spinneret 8 rotates at high speed, and the polymer solution raw material for the nanofiber membrane is ejected outward under centrifugal force. Since the spinneret 8 is connected to a positive voltage, and the electrode plate 9 is grounded or connected to a negative voltage, a potential difference exists between the spinneret 8 and the electrode plate 9, forming an electric field. The ejected nanofiber membrane raw material carries a positive charge. Under the action of the electric field force, the ejected nanofiber membrane raw material is stretched and refined, moving towards the electrode plate 9 and thus depositing on the surface of the base fabric to form a nanofiber membrane. The spinneret 8 is rotatably mounted on the slide 10, and the slide 10 can move left and right. Therefore, the nanofiber membrane raw material ejected by the spinneret 8 can form a wide nanofiber membrane, which is beneficial to improving the uniformity of the nanofiber membrane.

[0043] After the nanofiber membrane is deposited on the surface of the base fabric, it is conveyed forward to the drying unit 2. The high temperature inside the oven 21 dries the nanofiber membrane. The exhaust fan 22 operates to draw air from the top of the oven 21, which, compared to forced-air heating, prevents the nanofiber membrane surface fibers from being disordered by the hot air. The volatile solvent is drawn in by the exhaust fan 22 and conveyed to the solvent collector 23 for collection. The dried base fabric is then conveyed to the winding unit 4 and wound up by the winding wheel 6.

[0044] Example 2: An electrostatic centrifugal nanofiber membrane processing device (see...) Figure 1 , Figure 2 , Figure 3 , Figure 5The system includes a spinning unit 1 and a drying unit 2. An unwinding unit 3 is located at the front of the spinning unit 1, and a winding unit 4 is located at the rear of the drying unit 2. The unwinding unit 3 includes an unwinding wheel 5, and the winding unit 4 includes a winding wheel 6. The two ends of the base fabric are connected to the unwinding wheel 5 and the winding wheel 6, respectively. The winding wheel 6 is driven by a motor. After the base fabric is unwound from the unwinding wheel 5, it passes through the spinning unit 1 and the drying unit 2 in sequence, and finally is wound up on the winding wheel 6.

[0045] The spinning unit 1 includes a spinning box 7 and a spinneret 8. An electrode plate 9 and a sliding block 10 that moves left and right are installed inside the spinning box 7. The spinneret 8 is rotatably mounted on the sliding block 10 and is connected to a high-voltage positive voltage. The electrode plate 9 is grounded or connected to a high-voltage negative voltage. A rotating rod 12 driven by a centrifugal motor 11 is installed on the sliding block 10, and the spinneret 8 is fixedly connected to the rotating rod 12. A screw 14 driven by a moving motor 13 is installed inside the spinning box 7, and the sliding block 10 is adapted to the screw 14. A support plate 15 is installed inside the spinning box 7, and two upright plates 16 are set on the support plate 15. Two screws 14 are rotatably connected between the two upright plates 16, and a transmission belt connects the two screws 14. The moving motor 13 is mounted on one of the upright plates 16, and the output shaft of the moving motor 13 is fixedly connected to one of the screws 14. The slide block 10 includes a first seat and a second seat connected together. Both the first and second seats have threaded holes, which are threaded to two screw rods 14. A rotating rod 12 is rotatably mounted on the first seat, and a centrifugal motor 11 is mounted on the second seat. A transmission belt connects the output shaft of the centrifugal motor 11 and the rotating rod 12. A clearance groove 17 is provided on the support plate 15, and two parallel guide rails 18 are mounted on the support plate 15. Guide grooves 19 are provided on the guide rails 18, and a positioning slide plate 20 is slidably connected between the two guide grooves 19. The rotating rod 12 is rotatably connected to the positioning slide plate 20, and passes through the clearance groove 17. The moving motor 13 drives the two screw rods 14 to rotate, thereby achieving synchronous sliding of the first and second seats.

[0046] The drying unit 2 includes an oven 21 and an exhaust fan 22. The air inlet of the exhaust fan 22 is connected to the top of the oven 21, and the air outlet of the exhaust fan 22 is connected to a solvent collector 23. Heating wires 24 and drive rollers 25 are installed inside the oven 21, with the drive rollers 25 supporting the base fabric. The heating wires 24 are installed on the inner wall of the oven 21. The drive rollers 25 are positioned above the electrode plate 9. Long, narrow windows 26 are provided on both the front and rear sides of the oven 21 to facilitate the entry and exit of the base fabric. The base fabric is laid above the electrode plate 9, and nanofiber membrane raw materials are ejected from the spinneret 8 and deposited onto the base fabric. The base fabric is then conveyed forward to the drying unit 2 for drying.

[0047] A pressure accumulator 27 is installed on the pipeline between the exhaust fan 22 and the solvent collector 23. The pressure accumulator 27 improves the exhaust effect of the exhaust fan 22. An evaporator 28 is installed inside the solvent collector 23. A drain pipe 29 is connected to the bottom of the solvent collector 23, and a valve 30 is installed on the drain pipe 29. An air inlet 31 and an air outlet 32 ​​are provided on the top of the solvent collector 23. An extension sleeve 33 is provided inside the solvent collector 23. The upper end of the extension sleeve 33 is connected to the top of the solvent collector 23, and a gap is provided between the lower end of the extension sleeve 33 and the bottom of the solvent collector 23. Evaporator 28 pipelines are provided inside and around the extension sleeve 33. The air inlet 31 is connected to the extension sleeve 33, and the air outlet 32 ​​is located on the periphery of the extension sleeve 33.

[0048] The spinneret 8 is provided with a liquid storage chamber 34 and a fiber outlet 35. The liquid storage chamber 34 is filled with nanofiber membrane raw material liquid, which is ejected from the fiber outlet 35. The top of the spinneret 8 is fastened to the rotating rod 12. The top of the spinneret 8 is provided with a loading hole 36, which facilitates the loading of nanofiber membrane raw material liquid. The loading hole 36 is tightly connected to a sealing plug 37. The fiber outlet 35 is located at the bottom of the spinneret 8, and several fiber outlet 35s are evenly distributed circumferentially. The number of spinning units 1 is selected according to the thickness of the nanofiber membrane to be processed. A single spinning unit 1 or multiple spinning units 1 can be set. In this embodiment, two spinning units 1 are set, and the base fabric passes through the two spinning units 1 in sequence to achieve secondary deposition of nanofiber membrane raw material. The number of drying units 2 is selected according to the thickness of the nanofiber membrane to be dried. A single drying unit 2 or multiple drying units 2 can be set. In this embodiment, one drying unit 2 is set.

[0049] A nozzle 38 and a lifting ring 39 are installed on the spinneret 8. A universal ball head 40 is provided at one end of the nozzle 38, which is rotatably mounted on the spinneret 8. An adjusting rod 41 is hinged between the lifting ring 39 and the nozzle 38. The cavity inside the nozzle 38 forms an outlet hole 35, from which the nanofiber membrane raw material liquid is ejected. The lifting ring 39 moves up and down to adjust the tilt angle of the nozzle 38. Several nozzles 38 are evenly distributed around the circumference. The spinneret 8 is provided with mounting holes 42 corresponding to the nozzles 38. The mounting holes 42 connect the liquid storage chamber 34 and the outlet hole 35. An installation groove 43 adapted to the universal ball head 40 is provided at the outer end of the mounting hole 42. The universal ball head 40 is adapted to the installation groove 43, thereby realizing the universal rotation of the universal ball head 40. An adjusting ring 44 is threaded onto the outer wall of the spinneret 8. A ring groove 46 is provided on the lifting ring 39. Several positioning blocks 45 are circumferentially spaced on the adjusting ring 44, with their ends movably inserted into the ring groove 46. An axial sliding groove 47 is provided on the outer wall of the spinneret 8. A limiting pin 48 is connected to the lifting ring 39, with its end inserted into the sliding groove 47, thus achieving circumferential locking of the lifting ring 39. Rotating the adjusting ring 44 drives the lifting ring 39 to move axially, which in turn pushes the nozzle 38 to rotate via the adjusting rod 41, adjusting the tilt angle. The nozzle 38 can rotate to adjust the tilt angle, thereby adjusting the spray range of the nanofiber membrane material to adapt to different production needs.

[0050] During nanofiber membrane processing, the base fabric is conveyed forward through unwinding and rewinding. After being unwound by the unwinding wheel 5, the base fabric first passes through the spinning unit 1. The spinning unit 1 is equipped with support rollers to support the base fabric and facilitate its conveying. The spinneret 8 rotates at high speed, and the polymer solution raw material for the nanofiber membrane is ejected outward under centrifugal force. Since the spinneret 8 is connected to a positive voltage, and the electrode plate 9 is grounded or connected to a negative voltage, a potential difference exists between the spinneret 8 and the electrode plate 9, forming an electric field. The ejected nanofiber membrane raw material carries a positive charge. Under the action of the electric field force, the ejected nanofiber membrane raw material is stretched and refined, moving towards the electrode plate 9 and thus depositing on the surface of the base fabric to form a nanofiber membrane. The spinneret 8 is rotatably mounted on the slide 10, and the slide 10 can move left and right. Therefore, the nanofiber membrane raw material ejected by the spinneret 8 can form a wide nanofiber membrane, which is beneficial to improving the uniformity of the nanofiber membrane.

[0051] After the nanofiber membrane is deposited on the surface of the base fabric, it is conveyed forward to the drying unit 2. The high temperature inside the oven 21 dries the nanofiber membrane. The exhaust fan 22 operates to draw air from the top of the oven 21, which, compared to forced-air heating, prevents the nanofiber membrane surface fibers from being disordered by the hot air. The volatile solvent is drawn in by the exhaust fan 22 and conveyed to the solvent collector 23 for collection. The dried base fabric is then conveyed to the winding unit 4 and wound up by the winding wheel 6.

[0052] Example 3: An electrostatic centrifugal nanofiber membrane processing device (see...) Figure 7 , Figure 8 Its structure is similar to that of Example 1. The main difference is that in this example, the solvent collector 23 is provided with an air inlet 31 and an air outlet 32. The air inlet 31 is connected to the air outlet of the exhaust fan 22, and an air outlet 49 is provided at the wire outlet hole 35. The air outlet 32 ​​is connected to the air outlet 49.

[0053] A vent seat 50 is installed on the slide 10, and the vent seat 50 is rotatably connected to the rotating rod 12. A venting annular cavity 51 is provided on the inner wall of the vent seat 50, and a venting hole 52 is provided inside the rotating rod 12. A flow hole 53 is opened between the upper end of the venting hole 52 and the venting annular cavity 51. A venting connector 54 is connected to the lower end of the rotating rod 12, and several air nozzles 55 communicating with the venting holes 52 are provided on the vent seat 50. An air inlet connector 56 communicating with the venting annular cavity 51 is provided on the vent seat 50, and the air inlet connector 56 and the air outlet 32 ​​on the solvent collector 23 are connected by a pipe.

[0054] The spinneret 8 has several nozzles 57 evenly distributed around it. The through holes in the nozzles 57 form the wire outlet holes 35. The air outlet holes 49 are set on the nozzles 57. The opening end of the air outlet holes 49 is set on the inner wall of the wire outlet holes 35. The angle between the axis of the air outlet holes 49 and the axis of the wire outlet holes 35 is an acute angle. The air nozzles 55 and the air outlet holes 49 are connected by a pipe.

[0055] The airflow output from the solvent collector 23 is discharged outward through the air outlet 49 provided at the filament outlet 35. The impact of the airflow helps to improve the stretching and refining effect on the sprayed nanofiber membrane material, further drawing the nanofiber membrane material into filaments, improving the filament output effect, and thus improving the uniformity of the nanofiber membrane. Moreover, the solvent remaining in the airflow is sprayed into the spinning box 7 and then extracted and recycled by the exhaust fan 22, avoiding the airflow being directly discharged outward from the solvent collector 23, which would affect the environment and waste solvent. Other structures are the same as in Example 1.

[0056] Example 4: An electrostatic centrifugal nanofiber membrane processing device (see...) Figure 9 , Figure 10 Its structure is similar to that of Example 2. The main difference is that in this example, the solvent collector 23 is provided with an air inlet 31 and an air outlet 32. The air inlet 31 is connected to the air outlet of the exhaust fan 22, and an air outlet 49 is provided at the wire outlet hole 35. The air outlet 32 ​​is connected to the air outlet 49.

[0057] A vent seat 50 is installed on the slide 10, and the vent seat 50 is rotatably connected to the rotating rod 12. A venting annular cavity 51 is provided on the inner wall of the vent seat 50, and a venting hole 52 is provided inside the rotating rod 12. A flow hole 53 is opened between the upper end of the venting hole 52 and the venting annular cavity 51. A venting connector 54 is connected to the lower end of the rotating rod 12, and several air nozzles 55 communicating with the venting holes 52 are provided on the vent seat 50. An air inlet connector 56 communicating with the venting annular cavity 51 is provided on the vent seat 50, and the air inlet connector 56 and the air outlet nozzle 32 on the solvent collector 23 are connected by a pipe. An air outlet 49 parallel to the filament outlet 35 is provided inside the nozzle 38, and the air nozzles 55 and the air outlet 49 are connected by a pipe.

[0058] The airflow output from the solvent collector 23 is discharged outward through the air outlet 49 provided at the filament outlet 35. The impact of the airflow helps to improve the stretching and refining effect on the sprayed nanofiber membrane material, further drawing the nanofiber membrane material into filaments, improving the filament output effect, and thus improving the uniformity of the nanofiber membrane. Moreover, the solvent remaining in the airflow is sprayed into the spinning box 7 and then extracted and recovered by the exhaust fan 22, avoiding the airflow being directly discharged outward from the solvent collector 23, which would affect the environment and waste solvent. Other structures are the same as in Example 2.

[0059] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. An electrostatic centrifugal nanofiber membrane processing device, characterized in that, It includes a spinning unit and a drying unit. The spinning unit includes a spinning box and a spinneret. An electrode plate and a sliding block that can move left and right are installed inside the spinning box. The spinneret is rotatably mounted on the sliding block and is connected to a positive voltage. The electrode plate is grounded or connected to a negative voltage. The drying unit includes an oven and an exhaust fan. The air inlet of the exhaust fan is connected to the top of the oven, and the air outlet of the exhaust fan is connected to a solvent collector. A base fabric is laid above the electrode plate, and nanofiber membrane raw materials are sprayed out by the spinneret and deposited on the base fabric. The base fabric is then conveyed forward to the drying unit for drying.

2. The electrostatic centrifugal nanofiber membrane processing device according to claim 1, characterized in that, A rotating rod driven by a centrifugal motor is installed on the slide, and the spinneret is fixedly connected to the rotating rod; a screw driven by a mobile motor is installed inside the spinning box, and the slide is adapted to the screw.

3. The electrostatic centrifugal nanofiber membrane processing device according to claim 1, characterized in that, Heating wires and drive rollers are installed inside the drying oven, and the drive rollers support the base fabric.

4. The electrostatic centrifugal nanofiber membrane processing device according to claim 1, characterized in that, An evaporator is installed inside the solvent collector.

5. The electrostatic centrifugal nanofiber membrane processing device according to claim 1, characterized in that, The spinneret is equipped with a liquid storage chamber and a fiber outlet. The liquid storage chamber is filled with nanofiber membrane raw material liquid, and the nanofiber membrane raw material liquid is ejected from the fiber outlet.

6. The electrostatic centrifugal nanofiber membrane processing apparatus according to claim 5, characterized in that, The solvent collector is equipped with an air inlet and an air outlet. The air inlet is connected to the air outlet of the exhaust fan, and an air outlet is provided at the filament outlet. The air outlet is connected to the air outlet.

7. The electrostatic centrifugal nanofiber membrane processing apparatus according to claim 1, characterized in that, A nozzle and a lifting ring are installed on the spinneret. A universal ball head is set at one end of the nozzle. The universal ball head is mounted on the spinneret in all directions. An adjusting rod is hinged between the lifting ring and the nozzle. The cavity inside the nozzle forms the filament outlet hole. The nanofiber membrane raw material liquid is ejected from the filament outlet hole. The lifting ring moves up and down to adjust the tilt angle of the nozzle.

8. The electrostatic centrifugal nanofiber membrane processing apparatus according to claim 1, characterized in that, A pressure accumulator is installed on the pipeline between the exhaust fan and the solvent collector.

9. An electrostatic centrifugal nanofiber membrane processing apparatus according to any one of claims 1 to 8, characterized in that, An unwinding unit is provided at the front of the spinning unit, and a winding unit is provided at the rear of the drying unit. The unwinding unit includes an unwinding wheel, and the winding unit includes a winding wheel. The two ends of the base fabric are connected to the unwinding wheel and the winding wheel, respectively.

10. An electrostatic centrifugal nanofiber membrane processing apparatus according to any one of claims 1 to 8, characterized in that, Two spinning units are set up, and the base fabric passes through the two spinning units in sequence to achieve secondary deposition of nanofiber membrane raw materials.

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