Multi-nozzle coaxial electrostatic spinning device

Abstract

The utility model belongs to the technical field of electrostatic spinning, and particularly discloses a multi-nozzle coaxial electrostatic spinning device which comprises a frame, a lifting mechanism and a high-voltage power source, a receiver and an electrostatic metal plate which are arranged in parallel are fixedly connected in the frame, and the receiver is arranged close to the bottom of the frame and electrically connected with the negative electrode of the high-voltage power source. The electrostatic metal plate is located above the receiver and electrically connected with the positive electrode of the high-voltage power source, the lifting mechanism is arranged in the frame and located above the electrostatic metal plate, a plurality of coaxial sprayers arranged at equal intervals are fixedly connected to the lower portion of the lifting mechanism, and through holes allowing needle tips of the coaxial sprayers to penetrate through are formed in the electrostatic metal plate; and liquid inlets in the coaxial spray heads correspond to liquid supply devices respectively. According to the utility model, the lifting component is arranged, so that the intensity of an electric field is not changed when a filament forming path is adjusted, the condition that fiber filaments are different in thickness due to the change of the intensity of the electric field is avoided, and the filament forming quality of the fibers is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrostatic spinning, in particular to a multi-nozzle coaxial electrostatic spinning device. Background Art

[0002] Electrospinning is a special fiber manufacturing process that uses polymer solutions to perform directional jet spinning in a strong electric field to manufacture various fiber materials. Under the action of the electric field, the droplet at the needle tip changes from a sphere to a cone (i.e., a "Taylor cone"), and fiber filaments are extended from the tip of the cone. This method can produce polymer filaments with nanometer diameters. Electrospinning technology has played a very important role in the field of constructing one-dimensional nanostructured materials. Nanofiber materials with diverse structures have been successfully prepared using electrospinning technology. Through different preparation methods, solid, hollow, core-shell ultrafine fibers or spider web-like two-dimensional fiber membranes can be obtained. The multi-nozzle spinning device is the most commonly used electrospinning equipment at present. Electrostatic field interference will occur between each adjacent nozzle of the multi-nozzle coaxial electrospinning device. Therefore, the fiber filament quality of the multi-nozzle coaxial electrospinning device is related to the stability of the electric field strength applied by the device and the length of the filament path. During the production process, as the filaments continue to accumulate on the receiver, the fiber's filament path in the electric field continues to shorten, and the nozzle position needs to be constantly adjusted to maintain the fiber's filament path in the electric field unchanged. However, the electrostatic metal plate of the existing multi-nozzle coaxial electrospinning device is fixedly connected to the nozzle. Adjusting the nozzle position will also drive the electrostatic metal plate to move, which will affect the electric field strength between the electrostatic metal plate and the receiver. The fluctuation of the electric field strength will affect the quality of the fiber filament. Therefore, it is necessary to design a multi-nozzle coaxial electrospinning device in which the nozzle position can be adjusted up and down without affecting the electric field strength. Utility Model Content

[0003] In view of the above technical problems, the utility model provides a multi-nozzle coaxial electrospinning device in which the nozzle position can be adjusted up and down without affecting the electric field intensity.

[0004] In order to solve the above technical problems, the technical solution of the utility model is as follows: a multi-nozzle coaxial electrostatic spinning device, comprising a frame, a lifting mechanism, and a high-voltage power supply. A receiver and an electrostatic metal plate arranged in parallel with each other are fixedly connected in the frame. The receiver is arranged near the bottom of the frame and is electrically connected to the negative electrode of the high-voltage power supply. The electrostatic metal plate is located above the receiver and is electrically connected to the positive electrode of the high-voltage power supply. The lifting mechanism is arranged in the frame and is located above the electrostatic metal plate. The lifting mechanism comprises an electric telescopic rod and a nozzle fixing plate. The positive electrode of the high-voltage power supply is electrically connected to the nozzle fixing plate. The electric telescopic rod is fixedly connected to the top of the frame. The output end of the electric telescopic rod is fixedly connected to the nozzle fixing plate through an insulating connector. A plurality of coaxial nozzles arranged at equal intervals are fixedly connected below the nozzle fixing plate. A through hole is provided on the electrostatic metal plate for the needle tip of the coaxial nozzle to pass through. The inner core liquid inlet and the outer shell liquid inlet on the coaxial nozzle are respectively connected to the inner core liquid supply pipe and the outer shell liquid supply pipe, and the inner core liquid supply pipe and the outer shell liquid supply pipe are respectively connected to the corresponding liquid supply device.

[0005] Furthermore, a distance sensor is fixedly connected to the needle tip of the coaxial nozzle, a controller is fixedly connected to the top of the frame, and the distance sensor and the electric telescopic rod are both controlled by the controller.

[0006] Furthermore, transparent glass is installed between the frames, and the transparent glass in front is slidably connected to the frames through a slide rail.

[0007] Furthermore, an air extraction port is provided at the upper end of the frame, and the air extraction port is connected to a solvent recovery device.

[0008] Compared with the prior art, the utility model has the following advantages:

[0009] 1. The utility model fixes the electrostatic metal plate in the frame and opens a through hole to facilitate the passage of the needle tip of the coaxial nozzle. The coaxial nozzle is driven to move by an electric telescopic rod to adjust the distance of the filament path between the nozzle and the receiver. At this time, only the distance between the spinneret at the lower end of the coaxial nozzle and the receiver is changed, while the distance between the electrostatic metal plate (positive electrode) and the receiver (negative electrode) is not changed, thereby ensuring that the electric field strength of the positive and negative electrodes will not change, so that the diameter of the fiber filaments produced by the coaxial nozzle will not vary with the change of the electric field strength, thereby improving the quality of the fiber filaments.

[0010] 2. The utility model provides a distance sensor and a controller. After the wire-forming path distance is set on the controller, the device automatically adjusts the wire-forming path distance, thereby reducing errors introduced by manual operation. By installing transparent glass in the frame to seal the internal space of the device, and opening an exhaust port at the upper end of the frame and connecting it to a solvent recovery device, the volatile solvent can be collected, recovered and reused, thereby saving the cost of using the solvent. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model.

[0012] Figure 2 It is a structural schematic diagram of the connection relationship between the coaxial nozzle and the electrostatic metal plate of the utility model.

[0013] In the figure: 1. frame, 2. lifting mechanism, 21. electric telescopic rod, 22. nozzle fixing plate, 3. high voltage power supply, 4. receiver, 5. electrostatic metal plate, 6. insulating connector, 7. coaxial nozzle, 8. through hole, 9. inner core liquid inlet, 10. outer shell liquid inlet, 11. inner core liquid supply pipe, 12. outer shell liquid supply pipe, 13. controller, 14. distance sensor, 15. exhaust port. DETAILED DESCRIPTION

[0014] The utility model will be further described below in conjunction with the accompanying drawings.

[0015] like Figure 1 , Figure 2 A multi-nozzle coaxial electrospinning device shown in the figure includes a frame 1, a lifting mechanism 2, and a high-voltage power supply 3. A receiver 4 and an electrostatic metal plate 5 arranged in parallel with each other are fixedly connected in the frame 1. The receiver 4 is arranged near the bottom of the frame 1 and is electrically connected to the negative electrode of the high-voltage power supply 3. The electrostatic metal plate 5 is located above the receiver 4 and is electrically connected to the positive electrode of the high-voltage power supply 3. The lifting mechanism 2 is arranged in the frame 1 and is located above the electrostatic metal plate 5. The lifting mechanism 2 includes an electric telescopic rod 21 and a nozzle fixing plate 22. The positive electrode of the high-voltage power supply 3 is electrically connected to the nozzle fixing plate 22. The nozzle The fixed plate 22 is a conductive metal plate, the electric telescopic rod 21 is fixedly connected to the top of the frame 1, the output end of the electric telescopic rod 21 is fixedly connected to the nozzle fixed plate 22 through an insulating connector 6, and a number of coaxial nozzles 7 arranged at equal intervals are fixedly connected below the nozzle fixed plate 22. A through hole 8 is provided on the electrostatic metal plate 5 for the needle tip of the coaxial nozzle 7 to pass through, the inner core liquid inlet 9 and the outer shell liquid inlet 10 on the coaxial nozzle 7 are respectively connected to the inner core liquid supply pipe 11 and the outer shell liquid supply pipe 12, and the inner core liquid supply pipe 11 and the outer shell liquid supply pipe 12 are respectively connected to the corresponding liquid supply devices.

[0016] It should be noted that, in the present embodiment, the liquid supply device comprises two storage tanks for storing the inner core spinning solution and the outer shell spinning solution respectively, two micro-injection pumps for transporting the two spinning solutions to the corresponding liquid supply pipes respectively, and an insulating pipe connecting these components. The connection methods and structures of these components are well known to those skilled in the art and will not be described in detail here.

[0017] In order to enable the device to automatically adjust the silk-forming path between the coaxial nozzle 7 and the receiver 4, a distance sensor 14 is fixedly connected to the needle tip of the coaxial nozzle 7. The lowest sensing position of the distance sensor 14 is level with the lowest silk outlet of the coaxial nozzle 7. A controller 13 is fixedly connected to the top of the frame 1. The distance sensor 14 and the electric telescopic rod 21 are both controlled by the controller 13.

[0018] In order to protect the internal environment of the device from wind and dust when it is working, and to prevent the solvent from evaporating and drifting around the studio, which is inconvenient to collect, transparent glass is installed in frame 1. The transparent glass in front is slidably connected to frame 1 through a slide rail. When it is necessary to operate the inside of the device, the transparent glass can be slid to perform various operations inside.

[0019] In order to recycle the volatile solvent, an exhaust port 15 is provided at the upper end of the frame 1, and the exhaust port 15 is connected to a solvent recovery device. The volatilized solvent is collected in the recovery device through the exhaust port 15 for solvent recovery.

[0020] The specific working process of the utility model is as follows:

[0021] The configured inner core spinning solution and outer shell spinning solution are added into the storage tank of the corresponding liquid supply device, the high voltage power supply 3 is turned on, the coaxial nozzle 7 and the electrostatic metal plate 5 are positively charged, a stable electric field is formed between the electrostatic metal plate 5 and the receiver 4, and the silk path distance is set on the controller 13. The distance sensor 14 senses the distance between the receiver 4 and transmits it to the controller 13 through the signal. The controller 13 controls the movement of the electric telescopic rod 21 to drive the coaxial nozzle 7 fixed on the nozzle fixing plate 22 to move synchronously, and gradually adjusts the silk path distance to reach the set value, and then turns on the liquid supply device. The inner core spinning solution enters the central part of the coaxial nozzle 7 through the inner core liquid supply tube 11 and the inner core liquid inlet 9 in turn, and gathers to the spinneret at the lower end of the nozzle to form the inside of the droplet. At the same time, the outer shell spinning solution passes through the inner core liquid supply tube 11 and the inner core liquid inlet 9 in turn, and then enters the center part of the coaxial nozzle 7 and gathers to the spinneret at the lower end of the nozzle to form the inside of the droplet. The liquid passes through the outer shell liquid supply pipe 12 and the outer shell liquid inlet 10 and enters the peripheral part of the coaxial nozzle 7 and gathers at the spinneret at the lower end of the nozzle to form the outside of the droplet. The droplet forms a cone under the action of the electric field force and is ejected in the direction of the electric field. After passing through the filamentation path and evaporating the solvent, it forms fiber filaments, which fall on the surface of the receiver 4 and gradually form a fiber web. As the fiber filaments continue to accumulate on the receiver 4, the fiber filamentation path continues to shorten in the electric field. The distance sensor 14 continuously senses the distance from the surface of the fiber web on the receiver and transmits the signal to the controller 13. The controller 13 controls the movement of the electric telescopic rod 21, driving the coaxial nozzle 7 fixed on the nozzle fixing plate 22 to move synchronously, and gradually adjusts the distance of the filamentation path to reach the set value, thereby ensuring that the distance of the filamentation path always meets the set value.

[0022] It should be noted that the filamentation path mentioned in the specification refers to the path of the fiber droplets from the spinneret at the lower end of the coaxial nozzle 7 to the surface of the receiver 4 .

Claims

1. A multi-nozzle coaxial electrospinning device, comprising a frame (1), a lifting mechanism (2), and a high-voltage power supply (3), wherein a receiver (4) and an electrostatic metal plate (5) arranged in parallel with each other are fixedly connected in the frame (1), wherein the receiver (4) is arranged near the bottom of the frame (1) and is electrically connected to the negative electrode of the high-voltage power supply (3), and the electrostatic metal plate (5) is located above the receiver (4) and is electrically connected to the positive electrode of the high-voltage power supply (3), and the lifting mechanism (2) is arranged in the frame (1) and is located above the electrostatic metal plate (5), characterized in that: The lifting mechanism (2) comprises an electric telescopic rod (21) and a nozzle fixing plate (22); the nozzle fixing plate (22) is electrically connected to the positive electrode of the high-voltage power supply (3); the electric telescopic rod (21) is fixedly connected to the top of the frame (1); the output end of the electric telescopic rod (21) is fixedly connected to the nozzle fixing plate (22) via an insulating connector (6); a plurality of coaxial nozzles (7) arranged at equal intervals are fixedly connected below the nozzle fixing plate (22); a through hole (8) is provided on the electrostatic metal plate (5) for the needle tip of the coaxial nozzle (7) to pass through; the inner core liquid inlet (9) and the outer shell liquid inlet (10) on the coaxial nozzle (7) are respectively connected to an inner core liquid supply pipe (11) and an outer shell liquid supply pipe (12); the inner core liquid supply pipe (11) and the outer shell liquid supply pipe (12) are respectively connected to corresponding liquid supply devices.

2. The multi-nozzle coaxial electrospinning device according to claim 1, characterized in that: A distance sensor (14) is fixedly connected to the needle tip of the coaxial nozzle (7), a controller (13) is fixedly connected to the top of the frame (1), and the distance sensor (14) and the electric telescopic rod (21) are both controlled by the controller (13).

3. The multi-nozzle coaxial electrospinning device according to claim 1, characterized in that: Transparent glass is installed between the frames (1), and the transparent glass in front is slidably connected to the frames (1) via a slide rail.

4. The multi-nozzle coaxial electrospinning device according to claim 1, characterized in that: An air extraction port (15) is provided at the upper end of the frame (1), and the air extraction port (15) is connected to a solvent recovery device.

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