CN210529116U - Carbon fiber microwave graphitization equipment capable of continuously processing - Google Patents
Carbon fiber microwave graphitization equipment capable of continuously processing Download PDFInfo
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Abstract
The utility model discloses a carbon fiber microwave graphitization equipment that can continuous processing is equipped with the gaseous dynamic seal device in entrance and the gaseous dynamic seal device in exit respectively in the both sides of microwave heating cavity, the both sides of microwave heating cavity pass through the tubular metal resonator respectively with the gaseous dynamic seal device in entrance and the gaseous dynamic seal device sealing connection in exit, still be connected with the protective gas intake pipe between the gaseous dynamic seal device in microwave heating cavity and entrance, still be connected with the protective gas forced air cooling pipe between the gaseous dynamic seal device in microwave heating cavity and exit. The utility model discloses contain microwave measurement and control system, can real-time supervision incident/reflected power's change, real-time adjustment frequency guarantees solid-stateThe microwave source and the cavity have better matching degree; the utility model also provides several kinds of can simultaneous processingNThe cylindrical cavity of the carbon fiber is adopted, so that the production efficiency is greatly improved; simple structure, small volume, low cost and convenient mass production.
Description
Technical Field
The utility model relates to a carbon fiber graphitization heating technical field especially relates to a carbon fiber microwave graphitization equipment that can continuous processing.
Background
High modulus graphitized carbon fibers, also referred to as graphite fibers for short, are generally believed to have a modulus of less than 344GPaThe modulus of the graphite fiber is higher than 344GPa. The graphite fiber has excellent performances of high modulus, high strength, low specific gravity and the like, and is a key strategic material for national defense and national economic construction. At present, domestic carbon fiber materials are mainly applied to sports and leisure articles, but the proportion of industrial-grade carbon fibers is gradually improved in recent years, and the demand of industrial-grade and military-grade high-modulus graphitized carbon fibers is huge. The preparation of graphitized carbon fiber needs higher heating temperature, and the graphitizing temperature of the graphitized carbon fiber needs about 2500-.
Microwave heating devices have long been used, and materials generate heat by absorbing microwave energy by themselves, and the specific principle is that the materials are heated integrally in an electromagnetic field due to self dielectric loss. The microwave graphitization of the carbon fiber is based on the heating principle, the carbon content of the carbonized carbon fiber reaches more than 90 percent, and the carbon fiber has excellent microwave absorption property; the microwave heating has selectivity, only the carbon fiber tows can be heated, and the furnace wall can not be heated, so that the problem of heating efficiency is solved, the skin-core phenomenon is avoided, and meanwhile, the service life of the heating device can be greatly prolonged.
Most domestic enterprises and research units adopt the mode of traditional thermal radiation heating at present, through the mode of intermediate frequency heating, heat furnace earlier for temperature reaches a suitable heating interval in the whole stove, and the carbon fiber silk bundle passes whole zone of heating in succession, accomplishes the graphitization processing of carbon fiber. This method has several major disadvantages: (1) the traditional heating mode has slow heating rate and low thermal efficiency; (2) the inner wall material of the traditional heating hearth can not bear the high temperature of more than 2000 ℃, and the hearth is easy to crack and incinerate under the baking action of long-time high temperature, so that the service life of the hearth is greatly shortened.
Compared with the traditional radiation heating, the carbon fiber microwave heating has the following differences in heat transfer mode: (1) the traditional heat radiation method is that heat is radiated to the surface of an object through far infrared rays, and then the heat is conducted to the inside of the object from the surface in a heat conduction mode, so that a certain temperature difference is generated between the inside and the outside of the object, and a skin-core phenomenon can be possibly generated; (2) the microwave heating is realized by simultaneously heating the inside and the outside of an object caused by medium loss, does not need heat conduction, is quicker and more uniform in heating, and is very suitable for heating the carbon fiber tows.
In addition to the above-described conventional radiation heating method, there is also a method of high-frequency induction heating. Chinese patent (patent application No. 02135138) discloses "a method for producing high-strength high-modulus carbon fiber and its special equipment", which adopts high-frequency induction heating, and the method mainly has the following disadvantages: (1) the electrical conductivity of the carbon fiber is much smaller than that of metals such as copper, so that the high-frequency induction heating efficiency is lower; (2) because the high-frequency heater is easily subjected to external voltage fluctuation, the output power is unstable, the heating temperature fluctuation of the carbon fiber is obvious, and the product quality is influenced.
Compared with the traditional high-frequency induction heating, the carbon fiber microwave heating has the following differences in heating mode: (1) the high-frequency induction heating is a process of generating an alternating magnetic field in a heating area, and generating eddy current by carbon fiber under the induction of the alternating magnetic field, so as to generate a heating effect. But the conductivity of the carbon fiber is much smaller than that of metals such as copper and the like, so that the high-frequency induction heating efficiency is lower, and meanwhile, the problem of unstable output power also exists; (2) microwave heating is mainly a process of absorbing microwave energy and converting the microwave energy into heat through dielectric polarization relaxation loss of carbon fibers. Meanwhile, the carbon fiber is a high-loss medium, so that the microwave heating efficiency is extremely high. The output power of the solid microwave source for generating the microwave is more stable, and the quality of carbon fiber products is guaranteed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at making up the defects of the prior art and providing a carbon fiber microwave graphitization device capable of continuously processing.
The utility model discloses a realize through following technical scheme:
a carbon fiber microwave graphitization device capable of continuously processing comprises a microwave heating cavity, a microwave source, a carbon fiber filament unwinding roller and a carbon fiber filament winding roller, wherein microwaves generated by the microwave source are fed into the microwave heating cavity from the side surface of the microwave heating cavity, an inlet gas dynamic sealing device and an outlet gas dynamic sealing device are respectively arranged at two sides of the microwave heating cavity, two sides of the microwave heating cavity are respectively in sealing connection with the inlet gas dynamic sealing device and the outlet gas dynamic sealing device through metal pipes, a protective gas inlet pipe is also connected between the microwave heating cavity and the inlet gas dynamic sealing device, a protective gas air cooling pipe is also connected between the microwave heating cavity and the outlet gas dynamic sealing device, protective gas is introduced into the microwave heating cavity through the protective gas inlet pipe, air cooling gas is introduced into the heated carbon fiber filament bundle through the protective gas air cooling pipe to perform forced air cooling, the temperature measuring device is further installed on the outer side of the microwave heating cavity, the carbon fiber yarns on the carbon fiber yarn unwinding roller sequentially penetrate through the inlet gas dynamic sealing device and the microwave heating cavity, the carbon fiber yarns are heated through microwaves when passing through the microwave heating cavity, the heated carbon fiber yarns penetrate out of the microwave heating cavity and penetrate through the outlet gas dynamic sealing device, and the yarns are collected through the carbon fiber yarn collecting roller.
The microwave heating device also comprises a microwave control unit, wherein the microwave control unit monitors the incident/reflected power of the microwave heating cavity in real time and adjusts the power output by the microwave source according to the magnitude of the reflected power.
The microwave source adopts a solid microwave circuit, simultaneously outputs single-path or multi-path microwave power, and the working center frequency point is 315MHz、433MHz、915MHzAnd 2450MHzThe bandwidth is 100MHzBy means of coaxial line direct couplingDIN7/16 standard connectors feed microwaves from the side of the microwave heating cavity.
The microwave heating cavity is a cylindrical cavity, and the microwave heating cavity has a single path andNthe road structure is as follows: the single path is to feed microwaves into the cylindrical cavity from the side surface of the cylindrical cavity, and carbon fibers are processed in the center of the cylindrical cavity;Nthe routes are divided into the following: (1) the center of the cavity is fed with microwaves and the periphery of the cavity is symmetrically distributedNCarbon fibers; (2) internal symmetrical distributionNThe same coaxial lines for feeding microwaves are symmetrically distributed outsideNCarbon fibers; (3) external symmetrical distributionNThe same coaxial lines for feeding microwaves are symmetrically distributed insideNRoad carbon fiber, whereinN≥4。
The single-way cylindrical cavity comprises a cylinder, cover plates are fixed on two sides of the cylinder respectively, round holes are formed in the two cover plates, shielding sleeves are connected to the two round holes respectively and are connected with an inlet gas dynamic sealing device and an outlet gas dynamic sealing device respectively, and two rotary cover plates for tuning are arranged on the two cover plates respectively.
The microwave heating cavity is internally provided with a quartz glass tube, and the carbon fiber tows continuously pass through the microwave heating cavity in the quartz glass tube to be subjected to microwave heating. The quartz glass tube penetrates through the cavity, and the carbon fiber tows continuously pass through the cavity in the quartz glass tube for microwave heating, so that the problem of high-temperature volatilization of the carbon fibers is solved, and measures such as no glass tube, tube replacement or addition of an adsorption material can be taken; installing a dynamic sealing device and an air sealing device at an inlet and an outlet of the carbon fiber tows; and the high-temperature graphitized carbon fiber tows at the outlet are subjected to forced air cooling by adopting high-purity nitrogen, other inert gases or mixed gases of different inert gases.
The microwave heating temperature can reach more than 2500 ℃, and the continuous and uniform heating is carried out; the temperature measuring device adopts a non-contact laser aiming infrared thermometer to measure the temperature.
To achieve the required temperatures for graphitization, a cascade combination of multiple chambers in series may be used. A plurality of identical microwave heating cavities are connected in series, each microwave heating cavity is connected with a microwave source, and the carbon fiber tows are sequentially heated through the plurality of microwave heating cavities connected in series.
The protective gas is usually composed of high-purity nitrogen, other inert gases or a mixture of different inert gases, and a small amount of boron element can be added into the protective gas in order to accelerate the graphitization.
The utility model has the advantages that: (1) for high strength, high modulus carbon fibers, the graphitization heating temperature should typically be above 2500 ℃. The microwave graphitization equipment is adopted, so that the heating temperature can be increased by about several hundred degrees compared with the conventional heat radiation heating temperature; (2) the microwave graphitization equipment is equipment for heating the carbon fiber tows by microwaves, and is completely different from a thermal radiation heating mode, the carbon fiber tows are heated by microwaves by heating the inner and outer bodies simultaneously, and the skin-core phenomenon cannot be generated by the heating mode. The heating of the carbon fiber tows is completed in the microwave cavity, the temperature of the inner wall of the cavity is not high, so that the inner wall of the heater cannot crack or be incinerated, and the service life of the heater can be greatly prolonged; (3) the electrical conductivity of the carbon fiber is smaller than that of copper and other metals, so that the high-frequency induction heating efficiency is lower, and meanwhile, the problem of unstable output power exists. Microwave heating is mainly a process of absorbing microwave energy and converting the microwave energy into heat through dielectric polarization relaxation loss of carbon fibers. Meanwhile, the carbon fiber is a high-loss medium, so that the microwave heating efficiency is extremely high. The output power of the solid microwave source for generating the microwave is more stable, which is beneficial to ensuring the quality of the carbon fiber product; (4) the microwave graphitization equipment only heats the carbon fiber tows, and does not heat other parts, so the heating mode has extremely high heating efficiency; (5) the utility model discloses contain microwave measurement and control system, can incident/anti-The frequency is adjusted in real time due to the change of the emitting power, so that the solid microwave source and the cavity are ensured to have better matching degree; (6) the utility model also provides several kinds of can simultaneous processingNThe cylindrical cavity of the carbon fiber is adopted, so that the production efficiency is greatly improved; (7) as a revolutionary carbon fiber microwave graphitization device, the device has the advantages of simple structure, small volume, low cost and convenience for mass production.
Drawings
Fig. 1 is a schematic two-dimensional structure diagram of a carbon fiber microwave graphitization device.
Fig. 2 is a schematic three-dimensional structure diagram of a carbon fiber microwave graphitization device.
Fig. 3 is a schematic structural view of a single-path microwave heating cavity.
Fig. 4 is a schematic structural view of a microwave heating cavity in which microwaves are fed into the center of the cavity and four paths of carbon fibers are symmetrically distributed around the cavity.
Fig. 5 is a schematic structural view of a microwave heating cavity with four identical coaxial cables for feeding microwaves symmetrically distributed inside and four carbon fibers symmetrically distributed outside.
Fig. 6 is a schematic structural view of a microwave heating cavity in which four identical coaxial cables for feeding microwaves are symmetrically distributed on the outside and four carbon fibers are symmetrically distributed on the inside.
Fig. 7 is a schematic view of a cascade combination of multiple microwave heating chambers.
Fig. 8 is a schematic diagram of a microwave measurement and control system.
FIG. 9 is a schematic view of a non-contact labyrinth seal arrangement.
Detailed Description
As shown in figure 1, a carbon fiber microwave graphitization device capable of being continuously processed comprises a microwave heating cavity 1, a microwave source 2, a carbon fiber filament unwinding roller 3 and a carbon fiber filament winding roller 4, wherein microwaves generated by the microwave source 2 are fed into the microwave heating cavity 1 from the side surface of the microwave heating cavity 1, an inlet gas dynamic sealing device 5 and an outlet gas dynamic sealing device 6 are respectively arranged at two sides of the microwave heating cavity 1, two sides of the microwave heating cavity 1 are respectively connected with the inlet gas dynamic sealing device 5 and the outlet gas dynamic sealing device 6 in a sealing manner through metal pipes, a protective gas inlet pipe 7 is also connected between the microwave heating cavity 1 and the inlet gas dynamic sealing device 5, a protective gas air cooling pipe 8 is also connected between the microwave heating cavity 1 and the outlet gas dynamic sealing device 6, and protective gas is introduced into the microwave heating cavity 1 through the protective gas inlet pipe 7, the carbon fiber filament bundle after heating is forced to be air-cooled by introducing air-cooled gas through the protective gas air cooling pipe 8, the temperature measuring device 9 is further installed on the outer side of the microwave heating cavity 1, the carbon fiber filaments on the carbon fiber filament unwinding roller 3 sequentially penetrate through the inlet gas dynamic sealing device 5 and the microwave heating cavity 1, the carbon fiber filaments are heated through microwaves when passing through the microwave heating cavity, the heated carbon fiber filaments penetrate out of the microwave heating cavity 1 and penetrate through the outlet gas dynamic sealing device 6, and the filaments are collected through the carbon fiber filament winding roller 4.
The microwave heating device further comprises a microwave control unit 10, wherein the microwave control unit 10 monitors the incident/reflected power of the microwave heating cavity in real time and adjusts the power output by the microwave source according to the reflected power.
The microwave source 2 adopts a solid microwave circuit, has accurate microwave power regulation and frequency regulation functions, simultaneously outputs single-path or multi-path microwave power, and has a working center frequency point of 315MHz、433MHz、915MHzAnd 2450MHzThe bandwidth is 100MHzBy means of coaxial line direct couplingDIN7/16 standard fittings microwaves are fed from the side of the microwave heating chamber, which heats the carbon fiber tow in an electromagnetically focused fashion.
The microwave heating cavity 1 is a cylindrical cavity, and the microwave heating cavity has a single path andNthe road structure is as follows: the single path is to feed microwaves into the cylindrical cavity from the side surface of the cylindrical cavity, and carbon fibers are processed in the center of the cylindrical cavity;Nthe routes are divided into the following: (1) the center of the cavity is fed with microwaves and the periphery of the cavity is symmetrically distributedNCarbon fibers; (2) internal symmetrical distributionNThe same coaxial lines for feeding microwaves are symmetrically distributed outsideNCarbon fibers; (3) external symmetrical distributionNThe same coaxial lines for feeding microwaves are symmetrically distributed insideNRoad carbon fiber, whereinN≥4。
The single-path cylindrical cavity comprises a cylinder 11, cover plates 12 are fixed on two sides of the cylinder 11 respectively, round holes are formed in the two cover plates 12, shielding sleeves 13 are connected to the two round holes respectively, the two shielding sleeves 13 are connected with an inlet gas dynamic sealing device 5 and an outlet gas dynamic sealing device 6 respectively, and two rotary cover plates 14 for tuning are arranged on the two cover plates respectively. The cylindrical cavity is made of metal aluminum;
a quartz glass tube is arranged in the microwave heating cavity 1, and carbon fiber tows continuously pass through the microwave heating cavity in the quartz glass tube to be subjected to microwave heating. The quartz glass tube penetrates through the cavity, and the carbon fiber tows continuously pass through the cavity in the quartz glass tube for microwave heating, so that the problem of high-temperature volatilization of the carbon fibers is solved, and measures such as no glass tube, tube replacement or addition of an adsorption material can be taken; installing a dynamic sealing device and an air sealing device at an inlet and an outlet of the carbon fiber tows; and the high-temperature graphitized carbon fiber tows at the outlet are subjected to forced air cooling by adopting high-purity nitrogen, other inert gases or mixed gases of different inert gases.
The microwave heating temperature can reach more than 2500 ℃, and the continuous and uniform heating is carried out; the temperature measuring device 9 adopts a non-contact laser aiming infrared thermometer to measure the temperature.
To achieve the required temperatures for graphitization, a cascade combination of multiple chambers in series may be used. A plurality of identical microwave heating cavities 1 are connected in series, each microwave heating cavity 1 is connected with a microwave source 2, and carbon fiber tows are sequentially heated through the plurality of microwave heating cavities connected in series.
The central positions of the cover plates on two sides of the single-path cylindrical cavity are provided with two through holes, the glass tube penetrates through the cavity through the two through holes, the carbon fiber tows in the glass tube continuously absorb microwaves through the cavity to be heated, and the measures such as no glass tube, tube replacement or addition of an adsorption material can be taken in consideration of the problem of high-temperature volatilization of the carbon fibers.
The solid microwave source generates microwaves, the microwaves are fed into the cylindrical cavity through the coaxial line to generate resonance, and the microwaves heat the carbon fiber tows in an electromagnetic focusing mode; the cylindrical cavity is essentially a microwave heater, the utility model discloses a microwave heater is not limited to cylindrical heater, still includes rectangle heater, oval and spherical heater, dish load waveguide heater, medium loading heater, travelling wave chamber heater etc..
The design of the cylindrical cavity body is to maximize the electric field intensity near the carbon fiber tows so as to improve the heating efficiency of the carbon fibers; the design of the cylindrical cavity also ensures that the resonant frequency of the cylindrical cavity is matched with that of the solid-state microwave source.
In order to avoid substituting air into the cavity when the carbon fiber tows move, a dynamic sealing device and an air sealing device need to be installed at an inlet and an outlet of the carbon fiber tows; in order to prevent the high-temperature oxidation of the outlet, the high-temperature graphitized carbon fiber tows at the outlet need to be subjected to forced air cooling by adopting high-purity nitrogen, other inert gases or mixed gases of different inert gases.
The temperature measuring device 9 directly measures a smaller object in an optical focusing mode by using an infrared non-contact measuring principle, and the precision can reach 0.5%.
The microwave control unit 10 can monitor the incident/reflected power of the cylindrical resonant cavity in real time, and adjust the frequency of microwave output from the microwave source according to the magnitude of the reflected power, so that the resonant frequency of the cylindrical resonant cavity is matched with the frequency of the microwave output from the microwave source.
The protective gas is usually composed of high-purity nitrogen, other inert gases or a mixture of different inert gases, and a small amount of boron element can be added into the protective gas in order to accelerate the graphitization.
The carbon fiber microwave graphitization equipment adopts microwave power to heat the carbon fiber tows, and the temperature is raised to the reaction temperature required by graphitization by inputting protective gas, so that the graphitization process can be rapidly completed.
The microwave graphitization temperature is above 2500 ℃, and the stability of the heating process needs to be ensured. Before heating, the protective layer on the surface of the carbon fiber tows needs to be washed by hot water; after the heating is completed, the protective layer needs to be plated on the surface of the carbon fiber again. In the cavity heating zone, the carbon fiber tows cannot directly contact with the inner wall of the heating cavity, otherwise, the inner wall of the cavity is burnt.
As shown in fig. 9, the inlet gas dynamic sealing device 5 and the outlet gas dynamic sealing device both adopt non-contact labyrinth sealing devices, a protective gas expansion chamber 22 is formed between baffles 23, protective gas enters the expansion chamber 22 through an inlet 24, the incident direction of the protective gas is perpendicular to the moving direction of the carbon fiber tows, and the carbon fiber tows enter the sealing device from a tow inlet 21 and leave the sealing device from a tow outlet 25. The purpose is to prevent air from entering from the inlet and the outlet of the carbon fiber tows, so that the carbon fiber tows are oxidized by the air during graphitization.
In order to discharge the air in the glass tube reactor, protective gas is required to be introduced into the glass tube, and the protective gas usually consists of high-purity nitrogen, other inert gases or mixed gases of different inert gases; the reactor material of the carbon fiber microwave graphitization is high-purity quartz glass, a sealing structure is adopted between the reactor material and the metal tube to prevent air from entering, and the carbon fiber is fixed at the central position of the cavity through a throat pipe arranged in the quartz glass tube reactor; punching holes at different positions of a carbon fiber outlet, installing a temperature measuring tube, and measuring the outlet temperature of the carbon fiber by adopting a non-contact laser aiming infrared thermometer; the microwave control unit comprises a solid microwave source, a temperature sensor, an industrial personal computer, a digital analog controller and the like, wherein the industrial personal computer drives the digital analog controller after obtaining a temperature signal, so that the power of the microwave output by the solid microwave amplifier is controlled, and the temperature required by the graphitization of the carbon fiber is met. In addition, the industrial personal computer can also control the frequency of the microwaves, the gas flow of protective gas and the tension and the speed of the reeled and paid-off wires; the air cooling device cools the carbon fiber by adopting high-purity nitrogen, other inert gases or mixed gases of different inert gases, reduces the temperature of the carbon fiber in a short time, and prevents the skin-core phenomenon caused by different expansion coefficients inside and outside the carbon fiber.
The carbon fiber microwave heating cavity in fig. 1 can be represented by a cascade combination of a plurality of microwave heating cavities connected in series as shown in fig. 7, and the cascade combination of the plurality of cavities connected in series is more favorable for heating the carbon fiber tow to the temperature required for graphitization.
In the cavity heating zone, the carbon fiber tows cannot directly contact with the inner wall of the heating cavity, otherwise, the inner wall of the cavity is burnt. Before heating, the protective layer on the surface of the carbon fiber tows needs to be washed by hot water; after the heating is completed, the protective layer needs to be plated on the surface of the carbon fiber again.
The microwave measurement and control system refers to a Chinese patent 'a novel automobile ignition control system' (patent application number: 201710333159). Fig. 8 shows a microwave measurement and control system in a carbon fiber microwave heating process, in which a phase-locked source 15, a driving stage 16, an amplifying stage 17, a coupler 18, and a microwave heating cavity 1 are sequentially connected, the coupler 18 transmits the coupled incident/reflected power to a detector 19, the detector 19 converts a microwave signal into an analog signal and transmits the analog signal to a processor 20, and the processor 20 combines a corresponding algorithm with the detected signal to adjust the frequency and amplitude of the microwave output by the phase-locked source 15.
Claims (8)
1. A carbon fiber microwave graphitization equipment capable of being continuously processed is characterized in that: the device comprises a microwave heating cavity, a microwave source, a carbon fiber yarn unwinding roller and a carbon fiber yarn winding roller, wherein microwaves generated by the microwave source are fed into the microwave heating cavity from the side surface of the microwave heating cavity, an inlet gas dynamic sealing device and an outlet gas dynamic sealing device are respectively arranged on two sides of the microwave heating cavity, two sides of the microwave heating cavity are respectively in sealing connection with the inlet gas dynamic sealing device and the outlet gas dynamic sealing device through metal pipes, a protective gas inlet pipe is also connected between the microwave heating cavity and the inlet gas dynamic sealing device, a protective gas air cooling pipe is also connected between the microwave heating cavity and the outlet gas dynamic sealing device, protective gas is introduced into the microwave heating cavity through the protective gas inlet pipe, and air cooling gas is introduced through the protective gas air cooling pipe to perform forced air cooling on the heated carbon fiber tows, the temperature measuring device is further installed on the outer side of the microwave heating cavity, the carbon fiber yarns on the carbon fiber yarn unwinding roller sequentially penetrate through the inlet gas dynamic sealing device and the microwave heating cavity, the carbon fiber yarns are heated through microwaves when passing through the microwave heating cavity, the heated carbon fiber yarns penetrate out of the microwave heating cavity and penetrate through the outlet gas dynamic sealing device, and the yarns are collected through the carbon fiber yarn collecting roller.
2. The microwave graphitization apparatus for carbon fiber capable of being processed continuously as claimed in claim 1, wherein: the microwave heating device also comprises a microwave control unit, wherein the microwave control unit monitors the incident/reflected power of the microwave heating cavity in real time and adjusts the power output by the microwave source according to the magnitude of the reflected power.
3. The microwave graphitization apparatus for carbon fiber capable of being processed continuously as claimed in claim 1, wherein: the microwave source adopts a solid microwave circuit, simultaneously outputs single-path or multi-path microwave power, and the working center frequency point is 315MHz、433MHz、915MHzAnd 2450MHzThe bandwidth is 100MHzBy means of coaxial line direct couplingDIN7/16 standard connectors feed microwaves from the side of the microwave heating cavity.
4. The microwave graphitization apparatus for carbon fiber capable of being processed continuously according to claim 3, wherein: the microwave heating cavity is a cylindrical cavity, and the microwave heating cavity has a single path andNthe road structure is as follows: the single path is to feed microwaves into the cylindrical cavity from the side surface of the cylindrical cavity, and carbon fibers are processed in the center of the cylindrical cavity;Nthe routes are divided into the following: (1) the center of the cavity is fed with microwaves and the periphery of the cavity is symmetrically distributedNCarbon fibers; (2) internal symmetrical distributionNThe same coaxial lines for feeding microwaves are symmetrically distributed outsideNCarbon fibers; (3) external symmetrical distributionNThe same coaxial lines for feeding microwaves are symmetrically distributed insideNRoad carbon fiber, whereinN≥4。
5. The microwave graphitization apparatus for carbon fiber capable of being processed continuously according to claim 4, wherein: the single-way cylindrical cavity comprises a cylinder, cover plates are fixed on two sides of the cylinder respectively, round holes are formed in the centers of the two cover plates, shielding sleeves are connected to the two round holes respectively and are connected with an inlet gas dynamic sealing device and an outlet gas dynamic sealing device respectively, and two rotary cover plates for tuning are arranged on the two cover plates respectively.
6. The microwave graphitization apparatus for carbon fiber capable of being processed continuously according to claim 4, wherein: the microwave heating cavity is internally provided with a quartz glass tube, and the carbon fiber tows continuously pass through the microwave heating cavity in the quartz glass tube to be subjected to microwave heating.
7. The microwave graphitization apparatus for carbon fiber capable of being processed continuously as claimed in claim 1, wherein: the temperature measuring device adopts a non-contact laser aiming infrared thermometer to measure the temperature.
8. The microwave graphitization apparatus for carbon fiber capable of being processed continuously according to claim 4, wherein: a plurality of identical microwave heating cavities are connected in series through metal pipes, each microwave heating cavity is connected with a microwave source, and carbon fiber tows are sequentially heated through the plurality of microwave heating cavities connected in series.
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