A continuous device for carbon nanotube-coated reinforced carbon fiber

Abstract

A continuous device for carbon nanotube-coated reinforced carbon fiber, which relates to the technical field of nano-material dispersion coating and reinforcement, includes a feeding mechanism, an extrusion molding mechanism, a dispersion coating mechanism, a material return mechanism, and a turning roller. The present invention utilizes "circular coating of carbon nanotube forming electrodes", "continuous dispersion coating form", "humidity control of carbon nanotube forming electrodes", "one-time double-sided coating and reinforcement", and "precise control of carbon nanotube slurry concentration" to achieve continuous and large-scale operation of carbon nanotube-coated reinforced carbon fiber. The present invention has good modification effect on carbon fiber, with the interlaminar shear strength increased by more than 20% and the transverse thermal conductivity increased by more than 30%. At the same time, the device has a high degree of continuity, ideal carbon nanotube dispersion coating effect, simple operation, low process cost, and is very suitable for large-scale production.

Description

Technical Field

[0001] The present invention relates to the technical field of nano - material dispersion coating enhancement, and particularly to a continuous device for coating and enhancing carbon fiber with carbon nanotubes. Background Art

[0002] Carbon fiber composites have been widely used in the fields of aerospace, national defense, etc. due to their excellent mechanical, electrical, and electromagnetic shielding properties. However, the smooth surface and chemical inertness of carbon fibers result in poor interfacial bonding ability between carbon fibers and matrix materials, leading to frequent interfacial failure. Therefore, modifying and enhancing the surface of carbon fibers with nano - materials has become an effective way to improve the interfacial performance of carbon fiber composites. CNTs have become an ideal choice for nano - reinforcing materials in carbon fiber composites due to their excellent mechanical, thermal, and electrical properties. Currently, relatively successful modification methods include chemical vapor deposition (CVD), electrophoretic deposition (EPD), and chemical grafting. However, the complex process routes and the lack of continuous production equipment make it difficult to widely apply the above - mentioned methods. Moreover, in these methods, the high - temperature environment and the repeated use of chemical reagents reduce the mechanical properties of carbon fibers themselves, and most process routes remain at the laboratory preparation stage. The carbon nanotube dispersion coating enhancement technology excited by free arc heat has high requirements for the synthesis, transportation, cyclic feeding, electrode forming, and humidity control of carbon nanotube slurries. Currently, there is no equipment that can meet the relevant requirements in an automated manner. Summary of the Invention

[0003] The present invention provides a continuous device for coating and enhancing carbon fiber with carbon nanotubes. The device only uses carbon nanotube powder and water as raw materials, and realizes the ultimate goal of continuously coating and enhancing carbon fiber through processes such as slurry mixing, transportation, carbon nanotube discharge electrode forming, humidity adjustment, self - cyclic feeding of the formed electrode, and self - dispersing coating of the carbon nanotube discharge electrode.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A continuous device for carbon nanotube-coated reinforced carbon fiber, comprising a feeding mechanism, an extrusion molding mechanism, a dispersion coating mechanism, a material return mechanism, and a turning roller. The dispersion coating mechanism includes a first tube body and a second tube body. The extrusion molding mechanism includes a Y-shaped material distribution conduit. Two free ends on the same side of the Y-shaped material distribution conduit are fixedly connected with a tapered extrusion molding die head. The small-diameter ends of the tapered extrusion molding die head are respectively and hermetically fixedly connected to the ends of the first tube body and the second tube body. The other end of the Y-shaped material distribution conduit is connected to the feeding mechanism. The other ends of the first tube body and the second tube body are connected to the material return mechanism. The first tube body and the second tube body are arranged opposite to each other vertically. Both the upper ends of the first tube body and the second tube body are open, and an upper metal discharge grid and a lower metal discharge grid are respectively fixedly installed at the openings. The upper metal discharge grid and the lower metal discharge grid are electrically connected to the positive electrode of the high-voltage drive circuit through wires. The tapered extrusion molding die head extrudes the raw material conveyed by the feeding mechanism into a carbon nanotube formed electrode, and conveys the carbon nanotube formed electrode into the first tube body and the second tube body. The carbon nanotube formed electrode is electrically connected to the negative electrode of the high-voltage drive circuit through a wire. The carbon fiber multifilament to be coated passes through the turning roller and is respectively attached to the upper metal discharge grid and the lower metal discharge grid, and realizes the coating reinforcement of the double-sided carbon nanotube dispersed phase.

[0006] Preferably, the material return mechanism includes a Y-shaped material return conduit. Two free ends on the same side of the Y-shaped material return conduit are also respectively fixedly connected with a tapered extrusion molding die head. The small-diameter end of the tapered extrusion molding die head is hermetically fixedly connected to the other end of the first tube body or the second tube body. The feeding mechanism includes a feeding speed control unit. The material return mechanism includes a material return speed control unit. The end of the Y-shaped material distribution conduit far from the first tube body is connected to the feeding speed control unit. The end of the Y-shaped material return conduit far from the first tube body is connected to the material return speed control unit. The feeding speed of the feeding speed control unit is greater than the material return speed of the material return speed control unit. The difference between the feeding speed and the material return speed meets the requirement of uniformly coating the carbon nanotube dispersed phase on the surface of the carbon fiber multifilament.

[0007] Preferably, the feeding speed control unit and the return speed control unit both include a spiral extrusion circulation barrel, a vertical spiral feeding screw coaxially arranged in the spiral extrusion circulation barrel, a worm gear reduction motor, and a DC motor. The worm gear reduction motor is connected to the DC motor, and the output end of the worm gear reduction motor can rotatably pass through the bottom end of the spiral extrusion circulation barrel and is fixedly connected to the bottom end of the vertical spiral feeding screw. The top end of the vertical spiral feeding screw is rotatably connected to the top of the spiral extrusion circulation barrel. The upper end of the side wall of the spiral extrusion circulation barrel of the feeding speed control unit is provided with a first discharge pipe, and the opposite side of the first discharge pipe is A first feed pipe is provided at the lower part of the side wall of the spiral extrusion circulation barrel, and the end of the first discharge pipe is sealed and fixedly connected to the end of the Y-shaped material distribution conduit away from the first tube body. A second feed pipe is provided at the side wall of the spiral extrusion circulation barrel of the return material speed control unit, and a second discharge pipe is provided at the lower part of the side wall of the spiral extrusion circulation barrel on the opposite side of the second feed pipe. The second feed pipe is sealed and fixedly connected to the end of the Y-shaped return material conduit away from the first tube body. The vertical spiral feeding screws of the feeding speed control unit and the return material speed control unit rotate in opposite directions and the feeding speed or the return material speed is controlled by controlling the rotation speed of the vertical spiral feeding screw.

[0008] Preferably, the feeding mechanism further comprises a three-way joint, a threaded ball valve 1, a slurry conveying pipeline, a gear pump, a spiral stirring blade, a DC stirring motor, a carbon nanotube slurry preparation tank, a threaded ball valve 2, a powder conveying pipeline, an electronic switch control valve, and a feeding device; the first feeding pipe is sealed and fixedly connected to one end of the three-way joint, the end of the three-way joint away from the first feeding pipe is sealed and fixedly connected to one end of the threaded ball valve 1, the other end of the threaded ball valve 1 is sealed and fixedly connected to one end of the slurry conveying pipeline, the other end of the slurry conveying pipeline is connected to the output end of the gear pump, and the input end of the gear pump is connected to one end of the threaded ball valve 2. The other end of the threaded ball valve 2 is connected to the discharge pipe of the carbon nanotube slurry preparation tank, the spiral stirring blade is vertically arranged at the central axis in the carbon nanotube slurry preparation tank, the top of the spiral stirring blade is fixedly connected to the output shaft end of the DC stirring motor, the DC stirring motor and the outer wall of the carbon nanotube slurry preparation tank are jointly fixedly connected with the stirring motor and the stirring barrel bracket, a feeding device is provided on the upper side of the carbon nanotube slurry preparation tank, the bottom end of the feeding device is connected to the carbon nanotube slurry preparation tank through a powder conveying pipeline, the powder conveying pipeline is provided with an electronic switch control valve, and the gear pump is connected to a gear pump motor.

[0009] Preferably, the third end of the three-way connector is connected to the second discharge pipe through a return conduit.

[0010] Preferably, it further includes a vacuum water pump and a slurry humidity adjustment filter element. The side wall of the slurry conveying pipeline is connected to the water suction end of the vacuum water pump through a first connecting pipe. The slurry humidity adjustment filter element is arranged in the first connecting pipe. The water outlet end of the vacuum water pump is connected to the carbon nanotube slurry preparation tank through a second connecting pipe.

[0011] Preferably, it further includes a distribution box for powering the equipment. A vacuum water pump support is arranged at the bottom end of the vacuum water pump. A worm and worm gear reduction motor support is arranged at the bottom end of the worm and worm gear reduction motor. A viscosity sensor is arranged in the carbon nanotube slurry preparation tank.

[0012] The continuous equipment for carbon nanotube-coated reinforced carbon fiber of the present invention has the following beneficial effects:

[0013] The present invention utilizes "circular coating of carbon nanotube forming electrodes", "continuous dispersion coating form", "humidity control of carbon nanotube forming electrodes", "one-time double-sided coating enhancement", and "precise control of carbon nanotube slurry concentration" to realize the continuous and large-scale operation of carbon nanotube-coated reinforced carbon fiber. The present invention has a good modification effect on carbon fiber, with the interlaminar shear strength increased by more than 20% and the transverse thermal conductivity increased by more than 30%. At the same time, the equipment has a high degree of continuity, an ideal carbon nanotube dispersion coating effect, simple operation, and low process cost, and is very suitable for large-scale production. Description of the Drawings

[0014] Figure 1 The front view of the present invention.

[0015] Figure 2 The rear view of the present invention.

[0016] Figure 3 The top view of the present invention.

[0017] Figure 4 The schematic diagram of the reverse side coating of the carbon fiber multifilament guided by the turning roller.

[0018] 1. Three-way joint, 2. Threaded ball valve I, 3. Slurry conveying pipeline, 4. Gear pump, 5. Spiral stirring blade, 6. DC stirring motor, 7. Stirring motor and stirring barrel support, 8. Carbon nanotube slurry preparation tank, 9. Distribution box, 10. Second connecting pipe, 11. Threaded ball valve II, 12. Vacuum water pump, 13. Vacuum water pump support, 14. Slurry humidity adjustment filter element, 15. Worm and gear reduction motor, 16. Worm and gear reduction motor support, 17. Vertical spiral feeding screw, 18. Spiral extrusion recycling barrel, 19. Tapered extrusion forming die head, 20. First pipe body, 21. Second pipe body, 22. DC motor, 23. Y-shaped material distribution duct, 24. Upper metal wire mesh grating, 25. Lower metal wire mesh grating, 26. Y-shaped return material duct, 27. Return material duct, 28. Gear pump motor, 29. Gear pump support, 30. Powder conveying pipeline, 31. Electronic switch control valve, 32. Feeding device, 33. Turning roller, 34. Carbon fiber multifilament. Detailed implementation manners

[0019] The following description details the embodiments of the present invention in a step-by-step progressive manner. This description is only for the preferred embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

[0020] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the purpose of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, specific orientation structure, and operation. Therefore, it should not be construed as a limitation to the present invention.

[0021] In the initial embodiment, a continuous device for carbon nanotube-coated reinforced carbon fiber of the present invention, such as Figures 1-4As shown, it includes a feeding mechanism, an extrusion molding mechanism, a dispersion coating mechanism, a recycling mechanism, and a turning roller. The dispersion coating mechanism includes a first tube body 20 and a second tube body 21. The extrusion molding mechanism includes a Y-shaped material distribution duct 23. Two free ends on the same side of the Y-shaped material distribution duct 23 are fixedly connected with a tapered extrusion molding die head 19. The small-diameter ends of the tapered extrusion molding die head 19 are respectively and hermetically fixedly connected to the ends of the first tube body 20 and the second tube body 21. The other end of the Y-shaped material distribution duct 23 is connected to the feeding mechanism. The other ends of the first tube body 20 and the second tube body 21 are connected to the recycling mechanism. The first tube body 20 and the second tube body 21 are arranged vertically opposite to each other, and both are open at the upper ends. An upper metal discharge grid 24 and a lower metal discharge grid 25 are respectively fixedly installed at the openings. The upper metal discharge grid 24 and the lower metal discharge grid 25 are electrically connected to the positive electrode of the high-voltage drive circuit through wires. The tapered extrusion molding die head 19 extrudes the raw material conveyed by the feeding mechanism into a carbon nanotube formed electrode and conveys the carbon nanotube formed electrode into the first tube body 20 and the second tube body 21. The carbon nanotube formed electrode is electrically connected to the negative electrode of the high-voltage drive circuit through a wire. The carbon fiber multifilament 34 to be coated passes through the turning roller 33 and is respectively attached to the upper metal discharge grid 24 and the lower metal discharge grid 25, and the double-sided coating enhancement of the carbon nanotube dispersed phase is realized. The turning roller is as Figure 4 shown. One side of the carbon fiber multifilament 34 passes through the lower metal discharge grid 25 for coating enhancement. After passing through the turning roller, the other side of the carbon fiber multifilament 34 passes through the upper metal discharge grid 24 for coating enhancement.

[0022] In a further embodiment, as Figures 1-3As shown, the feed back mechanism includes a Y-shaped feed back conduit 26, and the two free ends on the same side of the Y-shaped feed back conduit 26 are also fixedly connected with a tapered extrusion molding die 19, and the small diameter end of the tapered extrusion molding die 19 is sealed and fixedly connected to the other end of the first tube body or the second tube body; the feeding mechanism includes a feeding speed control unit, and the feed back mechanism includes a feed back speed control unit. The end of the Y-shaped feed conduit 23 away from the first tube body is connected to the feeding speed control unit, and the end of the Y-shaped feed back conduit 26 away from the first tube body is connected to the feed back speed control unit. The feeding speed of the feeding speed control unit is greater than the feed back speed of the feed back speed control unit, and the difference between the feeding speed and the feed back speed meets the requirement of uniformly coating the surface of the carbon fiber multifilament with the dispersed phase of carbon nanotubes. The best coating effect can be achieved only when the amount of the dispersed carbon nanotube phase passing through the upper metal discharge grid 24 and the lower metal discharge grid 25 is appropriate. Too much or too little will not meet the process requirements. The present invention satisfies the requirement of uniformly coating the dispersed carbon nanotube phase on the surface of the carbon fiber multifilament by controlling the difference between the feeding speed and the recycling speed. At the same time, the feeding speed control unit and the recycling speed control unit cooperate with each other to achieve continuous double-sided coating enhancement of the carbon fiber multifilament.

[0023] In a further embodiment, Figures 1-3 As shown, the feeding speed control unit and the return speed control unit both include a spiral extrusion circulating barrel 18, a vertical spiral feeding screw 17 coaxially arranged in the spiral extrusion circulating barrel 18, a worm gear reduction motor 15, and a DC motor 22. The worm gear reduction motor 15 is connected to the DC motor 22. The output end of the worm gear reduction motor 15 can rotatably pass through the bottom end of the spiral extrusion circulating barrel 18 and is fixedly connected to the bottom end of the vertical spiral feeding screw 17 to drive the vertical spiral feeding screw 17 to rotate. The top end of the vertical spiral feeding screw 17 is rotatably connected to the top of the spiral extrusion circulating barrel 18. The upper end of the side wall of the spiral extrusion circulating barrel 18 of the feeding speed control unit is provided with a first discharge pipe, and the spiral extrusion circulating barrel on the opposite side of the first discharge pipe is provided with a first discharge pipe. A first feed pipe is provided at the lower part of the side wall of 18, and the end of the first discharge pipe is sealed and fixedly connected to the end of the Y-shaped material distribution conduit 23 away from the first tube body. A second feed pipe is provided on the side wall of the spiral extrusion circulation barrel 18 of the return speed control unit, and a second discharge pipe is provided at the lower part of the side wall of the spiral extrusion circulation barrel 18 on the opposite side of the second feed pipe. The second feed pipe is sealed and fixedly connected to the end of the Y-shaped return conduit 26 away from the first tube body. The vertical spiral feeding screws 17 of the feeding speed control unit and the return speed control unit rotate in opposite directions (that is, the feeding side feeds the first tube body and the second tube body, and the return side discharges the excess material from the first tube body and the second tube body), and the feeding speed or the return speed is controlled by controlling the rotation speed of the vertical spiral feeding screw 17.

[0024] In a further embodiment, Figures 1-3 As shown, the feeding mechanism also includes a three-way joint 1, a threaded ball valve 2, a slurry conveying pipeline 3, a gear pump 4, a spiral stirring blade 5, a DC stirring motor 6, a carbon nanotube slurry preparation tank 8, a threaded ball valve 11, a powder conveying pipeline 30, an electronic switch control valve 31, and a feeding device 32. The first feeding pipe is sealed and fixedly connected to one end of the three-way joint 1, the end of the three-way joint 1 away from the first feeding pipe is sealed and fixedly connected to one end of the threaded ball valve 2, the other end of the threaded ball valve 2 is sealed and fixedly connected to one end of the slurry conveying pipeline 3, the other end of the slurry conveying pipeline 3 is connected to the output end of the gear pump 4, and the input end of the gear pump 4 is connected to the threaded ball valve 2. The threaded ball valve 11 is connected to one end of the carbon nanotube slurry preparation tank 8, and the other end of the threaded ball valve 11 is connected to the discharge pipe of the carbon nanotube slurry preparation tank 8. The spiral stirring blade 5 is vertically arranged at the central axis of the carbon nanotube slurry preparation tank 8, and the top of the spiral stirring blade 5 is fixedly connected to the output shaft end of the DC stirring motor 6. The DC stirring motor 6 and the outer wall of the carbon nanotube slurry preparation tank 8 are fixedly connected with the stirring motor and the stirring barrel bracket 7. A feeding device 32 is provided above one side of the carbon nanotube slurry preparation tank 8, and the bottom end of the feeding device 32 is connected to the carbon nanotube slurry preparation tank 8 through a powder conveying pipeline 30, and the powder conveying pipeline 30 is provided with an electronic switch control valve 31. The feeding device 32 is a hopper structure, and the feeding device 32 is fixedly connected to the stirring motor and the stirring barrel bracket 7, and the gear pump is connected to the gear pump motor.

[0025] In a further embodiment, Figures 1-3 As shown, the third end of the three-way connector 1 is connected to the second discharge pipe through the return pipe 27.

[0026] In a further embodiment, Figures 1-3 As shown, it also includes a vacuum water pump 12 and a slurry humidity regulating filter element 14. The side wall of the slurry conveying pipeline 3 is connected to the water suction end of the vacuum water pump through a first connecting pipe, and the slurry humidity regulating filter element 14 is arranged in the first connecting pipe. The water outlet end of the vacuum water pump is connected to the carbon nanotube slurry preparation tank 8 through a second connecting pipe 10. That is, the water content of the slurry is adjusted by suction and filtration.

[0027] In a further embodiment, Figures 1-3As shown, it also includes a distribution box 9 for powering the equipment, a vacuum water pump bracket 13 is provided at the bottom of the vacuum water pump, a worm gear reducer motor bracket 16 is provided at the bottom of the worm gear reducer motor 15, and a viscosity sensor is provided in the carbon nanotube slurry preparation tank 8. In implementation, the viscosity sensor can be connected to the controller signal of the system, and the controller controls the opening and closing of the electronic switch control valve 31 and the deionized water control valve according to the detection signal of the viscosity sensor to realize the intelligent adjustment of the slurry viscosity. The deionized water control valve is provided on a deionized water supply pipe, and the water supply pipe is connected to the carbon nanotube slurry preparation tank 8. At the same time, the second connecting pipe can also be provided with a flow sensor, and the controller pumps a certain amount of recycled water into the carbon nanotube slurry preparation tank 8 through the vacuum water pump according to the signal of the flow sensor to control the slurry concentration.

[0028] Working principle of the present invention:

[0029] The carbon nanotube powder enters the carbon nanotube slurry preparation tank 8 through the feeding device 32 and the powder conveying pipeline 30, and is mixed with deionized water and then continuously mixed and stirred by the spiral stirring blades 5 driven by the DC stirring motor 6, thereby forming a carbon nanotube slurry.

[0030] The viscosity of the carbon nanotube slurry is measured by the viscosity sensor in the carbon nanotube slurry preparation tank 8. If the viscosity is lower than the preset value, the electronic switch control valve 31 is opened to allow the carbon nanotube powder to enter the carbon nanotube slurry preparation tank 8 through the powder delivery pipeline. When the concentration (viscosity) of the carbon nanotube slurry reaches the preset value, the threaded ball valve 2 11 is opened. At the same time, the vacuum water pump 12 and the gear pump motor 28 are started. The carbon nanotube slurry is continuously transported forward under the drive of the gear pump motor 28, and the transmission speed of the slurry can be controlled by adjusting the speed of the gear pump motor 28. After the slurry is transmitted to the slurry delivery pipeline 3, the carbon nanotube slurry is humidity-controlled by the vacuum water pump 12 through the slurry humidity adjustment filter element 14, and the extracted water is transported to the carbon nanotube slurry preparation tank 8 through the second connecting pipe 10, completing the transformation of the carbon nanotube slurry into a semi-dry carbon nanotube material.

[0031] At the same time, the DC motor 22 of the feeding speed control unit and the return speed control unit is started, and the vertical spiral feeding screw 17 starts to rotate continuously under the drive of the worm gear reduction motor 15 driven by the DC motor, and the material transmission speed can be adjusted by controlling the speed of the DC motor 22, wherein the transmission directions of the two vertical spiral feeding screws 17 are opposite. The semi-dry carbon nanotube material is transmitted from the three-way joint 1 to the spiral extrusion circulation barrel 18, and through the continuous driving of the vertical spiral feeding screw 17, the material is gradually transported to the Y-shaped material distribution conduit 23, and after the upper and lower material distribution, it is transmitted to the gradually contracting extrusion molding die 19, and under the action of the die, a carbon nanotube molding electrode with a certain molding structural force is formed, and the electrode is continuously transported to the first tube body 20 and the second tube body 21 under the extrusion driving force of the vertical spiral feeding screw 17. The positive electrode of the high-voltage drive circuit in the distribution box 9 is connected to the upper metal discharge grid 24 and the lower metal discharge grid 25, and the negative electrode is connected to the carbon nanotube forming electrode. After the high-voltage drive circuit is started, the free arc generated between the positive and negative electrodes allows the carbon nanotubes to be dispersed under the high pressure gradient field generated by the multiplier movement caused by the phase change of deionized water, and realizes the self-coating of the carbon nanotubes on the surface of the carbon fiber. The dispersed unconsumed carbon nanotube forming electrode is transported to the spiral extrusion circulation barrel 18 through the Y-type return conduit 26 and is continuously driven by the vertical spiral feeding screw to the return conduit 27 to the three-way joint 1. At this time, the threaded ball valve 2 is closed to allow the semi-dry carbon nanotube forming electrode to be circulated and coated. When the semi-dry carbon nanotubes are consumed to the preset value, the threaded ball valve 2 is opened to replenish the semi-dry carbon nanotube raw materials. The carbon fiber multifilament achieves continuous double-sided coating enhancement under the guidance of the turning roller 33.

Claims

1. A continuous device for carbon nanotube-coated reinforced carbon fiber, characterized in that: It includes a feeding mechanism, an extrusion molding mechanism, a dispersion coating mechanism, a material recycling mechanism, and a turning roller. The dispersion coating mechanism includes a first pipe body and a second pipe body. The extrusion molding mechanism includes a Y-shaped material distribution conduit. Two free ends on the same side of the Y-shaped material distribution conduit are fixedly connected with a tapered extrusion molding die head. The small-diameter ends of the tapered extrusion molding die head are respectively and fixedly connected to the ends of the first pipe body and the second pipe body in a sealed manner. The other end of the Y-shaped material distribution conduit is connected to the feeding mechanism. The other ends of the first pipe body and the second pipe body are connected to the material recycling mechanism. The first pipe body and the second pipe body are arranged vertically opposite to each other, and both are open at the upper ends. An upper metal discharge grid and a lower metal discharge grid are respectively fixedly installed at the openings. The upper metal discharge grid and the lower metal discharge grid are electrically connected to the positive electrode of the high-voltage driving circuit through wires. The tapered extrusion molding die head extrudes the raw material conveyed by the feeding mechanism into a carbon nanotube forming electrode and conveys the carbon nanotube forming electrode into the first pipe body and the second pipe body. The carbon nanotube forming electrode is electrically connected to the negative electrode of the high-voltage driving circuit through a wire. The carbon fiber multifilament to be coated passes through the turning roller and is respectively attached to the upper metal discharge grid and the lower metal discharge grid, and realizes the coating enhancement of the carbon nanotube dispersed phase on both sides. The material recycling mechanism includes a Y-shaped material recycling conduit. Two free ends on the same side of the Y-shaped material recycling conduit are also respectively fixedly connected with a tapered extrusion molding die head. The small-diameter end of the tapered extrusion molding die head is fixedly connected to the other end of the first pipe body or the second pipe body in a sealed manner. The feeding mechanism includes a feeding speed control unit. The material recycling mechanism includes a material recycling speed control unit. The end of the Y-shaped material distribution conduit far from the first pipe body is connected to the feeding speed control unit. The end of the Y-shaped material recycling conduit far from the first pipe body is connected to the material recycling speed control unit. The feeding speed of the feeding speed control unit is greater than the material recycling speed of the material recycling speed control unit. The difference between the feeding speed and the material recycling speed meets the requirement of uniformly coating the carbon nanotube dispersed phase on the surface of the carbon fiber multifilament.

2. The continuous equipment for carbon nanotube-coated reinforced carbon fiber according to claim 1, characterized in that: The feeding speed control unit and the return material speed control unit both include a spiral extrusion circulating barrel, a vertical spiral feeding screw coaxially arranged in the spiral extrusion circulating barrel, a worm and gear reduction motor, and a DC motor. The worm and gear reduction motor is connected to the DC motor, and the output end of the worm and gear reduction motor rotatably penetrates the bottom end of the spiral extrusion circulating barrel and is fixedly connected to the bottom end of the vertical spiral feeding screw. The top end of the vertical spiral feeding screw is rotatably connected to the top of the spiral extrusion circulating barrel. The upper end of the side wall of the spiral extrusion circulating barrel of the feeding speed control unit is provided with a first discharge pipe, and the lower part of the side wall of the spiral extrusion circulating barrel on the opposite side of the first discharge pipe is provided with a first feeding pipe. The end of the first discharge pipe is hermetically and fixedly connected to one end of the Y-shaped material distribution conduit far from the first pipe body. The side wall of the spiral extrusion circulating barrel of the return material speed control unit is provided with a second feeding pipe, and the lower part of the side wall of the spiral extrusion circulating barrel on the opposite side of the second feeding pipe is provided with a second discharge pipe. The second feeding pipe is hermetically and fixedly connected to one end of the Y-shaped return material conduit far from the first pipe body. The vertical spiral feeding screws of the feeding speed control unit and the return material speed control unit have opposite helix directions, and the feeding speed or the return material speed is controlled by controlling the rotation speed of the vertical spiral feeding screw.

3. The continuous device for carbon nanotube-coated reinforced carbon fiber according to claim 2, characterized in that: The feeding mechanism further includes a three-way joint, a threaded ball valve I, a slurry conveying pipeline, a gear pump, a spiral stirring blade, a DC stirring motor, a carbon nanotube slurry preparation tank, a threaded ball valve II, a powder conveying pipeline, an electronic switch control valve, and a feeding device. The first feeding pipe is hermetically and fixedly connected to one end of the three-way joint. The end of the three-way joint far from the first feeding pipe is hermetically and fixedly connected to one end of the threaded ball valve I. The other end of the threaded ball valve I is hermetically and fixedly connected to one end of the slurry conveying pipeline. The other end of the slurry conveying pipeline is connected to the output end of the gear pump. The input end of the gear pump is connected to one end of the threaded ball valve II. The other end of the threaded ball valve II is connected to the discharge pipe of the carbon nanotube slurry preparation tank. The spiral stirring blade is arranged vertically at the central axis in the carbon nanotube slurry preparation tank. The top end of the spiral stirring blade is fixedly connected to the end of the output shaft of the DC stirring motor. The outer walls of the DC stirring motor and the carbon nanotube slurry preparation tank are jointly fixedly connected with a stirring motor and a stirring barrel bracket. An inlet device is arranged above one side of the carbon nanotube slurry preparation tank. The bottom end of the inlet device is connected to the carbon nanotube slurry preparation tank through a powder conveying pipeline. The powder conveying pipeline is provided with an electronic switch control valve. The gear pump is connected with a gear pump motor.

4. The continuous device for carbon nanotube-coated reinforced carbon fiber according to claim 3, characterized in that: The third end of the three-way joint is connected to the second discharge pipe through a return material conduit.

5. The continuous equipment for carbon nanotube-coated reinforced carbon fiber according to claim 4, characterized in that: It further includes a vacuum water pump and a slurry humidity adjustment filter element. The side wall of the slurry conveying pipeline is connected to the water suction end of the vacuum water pump through a first connecting pipe. The first connecting pipe is provided with a slurry humidity adjustment filter element. The water outlet end of the vacuum water pump is connected to the carbon nanotube slurry preparation tank through a second connecting pipe.

6. The continuous device for carbon nanotube-coated reinforced carbon fiber according to claim 5, characterized in that: It also includes a distribution box for powering the device. A vacuum water pump bracket is provided at the bottom of the vacuum water pump. A worm and gear reduction motor bracket is provided at the bottom of the worm and gear reduction motor. A viscosity sensor is provided inside the carbon nanotube slurry preparation tank.

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