A special equipment for carbon fiber production

Abstract

The invention relates to a special equipment for producing carbon fiber, comprising a wire-releasing device, a wire-collecting device and at least one carbonization furnace arranged between the wire-releasing device and the wire-collecting device, a front air isolation device is arranged between the carbonization furnace and the wire-releasing device, and a rear air isolation device is arranged between the carbonization furnace and the wire-collecting device; the front air isolation device comprises a front serpentine tube, one end of which is connected to the upper end of a heating chamber of the carbonization furnace, a first U-shaped isolation section is arranged on the front serpentine tube, and an isolation liquid for isolating air is contained in the U-shaped isolation section; the polymer material wire released by the wire-releasing device passes through the front serpentine tube, the heating chamber and the rear serpentine tube in sequence and is collected by the wire-collecting device, the first U-shaped isolation section and the second U-shaped isolation section can play a role of isolating air, and a series of operations such as preparing mixed slurry, impregnating and drying can be omitted, the production process is simplified, and the efficiency of carbon fiber preparation is improved, which has a certain promotion prospect.

Description

Technical Field

[0001] The invention relates to the technical field of carbon fiber production, and in particular to special equipment for carbon fiber production. Background Art

[0002] Carbon fiber is a new type of fiber material with high strength and high modulus fiber with a carbon content of more than 95%. It is a microcrystalline graphite material obtained by stacking organic fibers such as flake graphite microcrystals along the axial direction of the fiber and undergoing carbonization and graphitization treatment. Carbon fiber is "soft on the outside and hard on the inside". It is lighter than metal aluminum, but stronger than steel. It also has the characteristics of corrosion resistance and high modulus. It has been used in many fields such as aerospace, aviation, and industrial civil use. It not only has the inherent intrinsic properties of carbon materials, but also has the softness and processability of textile fibers. It is a new generation of reinforcing fiber.

[0003] Patent application No. 2017102743943 discloses a method for preparing a novel carbon fiber reinforced silicon carbide composite material, comprising the following steps: (1) preparing a silicon-containing mixed slurry, comprising graphite powder, silicon powder, and phenolic resin solution in a weight ratio of 1-3:1-3:4-8, adding graphite powder, silicon powder, and phenolic resin in sequence, and stirring at a high speed of 800-1000 rpm for 1 hour to form a uniform mixed slurry; (2) weaving polyacrylonitrile-based pre-oxidized fibers into a preform, and fully impregnating the mixed slurry formed in step (1) for 2-3 hours. 4 hours, and then drying at 100°C for 20 minutes after taking it out; (3) carbonizing the pre-oxidized preform obtained in step (2) under an inert gas atmosphere of 1700-180°C for 5-10 minutes to transform the pre-oxidized preform into a carbon fiber preform, and forming a silicon carbide protective layer on the outer surface of the pre-oxidized preform; (4) placing the carbon fiber preform obtained in step (3) into a mold, adding graphite powder and silicon powder mixed evenly in a weight ratio of 1:1, heating to 1700°C under vacuum, maintaining for 4-6 hours, and taking it out after cooling to obtain a carbon fiber reinforced silicon carbide composite material.

[0004] The above-mentioned carbon fiber preparation process requires preparing a mixed slurry first, then impregnating and drying it, and finally entering the carbonization furnace for carbonization treatment. The main purpose of impregnating the mixed slurry is to isolate oxygen. Although the above method can isolate oxygen, the operation process is relatively complicated, which reduces the efficiency of carbon fiber preparation.

[0005] Based on the above technical problems, the inventors have proposed a special equipment for carbon fiber production through innovative design, which can save a series of operations such as preparing mixed slurry, impregnation, drying, etc., simplify the production process, and improve the efficiency of carbon fiber preparation, which has certain promotion prospects. Summary of the invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides a special equipment for producing carbon fiber.

[0007] The present invention is achieved through the following technical scheme, which provides a special equipment for carbon fiber production, including a wire-releasing device, a wire-collecting device and at least one carbonization furnace arranged between the wire-releasing device and the wire-collecting device, a front air isolation device is arranged between the carbonization furnace and the wire-releasing device, and a rear air isolation device is arranged between the carbonization furnace and the wire-collecting device; the front air isolation device includes a front serpentine tube, one end of which is connected to the upper end of the heating chamber of the carbonization furnace, a first U-shaped isolation section is arranged on the front serpentine tube, and an isolation liquid for isolating air is installed in the U-shaped isolation section; the rear air isolation device includes a rear serpentine tube, one end of which is connected to the lower end of the heating chamber of the carbonization furnace, a second U-shaped isolation section is arranged on the rear serpentine tube, and an isolation liquid for isolating air is installed in the second U-shaped isolation section; the polymer material wire released by the wire-releasing device passes through the front serpentine tube, the heating chamber and the rear serpentine tube in sequence and is collected by the wire-collecting device. The present application adopts a design layout in which the wire is released on one side and the wire is collected on the other side, and the carbonization furnace is located between the wire release station and the wire collection station, so that the carbon fiber production can be carried out in an assembly line manner.

[0008] Preferably, the isolation liquid is a gallium-indium-tin alloy liquid.

[0009] Preferably, the wire-releasing device comprises a wire-releasing roller and a wire-releasing motor for driving the wire-releasing roller to rotate, and the wire-releasing is achieved by driving the wire-releasing roller to rotate through the wire-releasing motor.

[0010] Preferably, the wire collecting device comprises a wire collecting roller and a wire collecting motor for driving the wire collecting roller to rotate, and the wire collecting is achieved by driving the wire collecting motor to rotate the wire collecting roller.

[0011] Preferably, in order to ensure that the polymer material filaments can smoothly enter and exit the heating chamber, a wire support is provided in the heating chamber, the wire support comprises a guide ring for the polymer material filaments to pass through, a support rod is fixed on the guide ring, and the support rod is fixed to the inner wall of the heating chamber.

[0012] Preferably, the heating chamber is an inert gas heating chamber.

[0013] Preferably, an air inlet is provided at the lower end of the heating chamber, and an exhaust port is provided at the upper end of the heating chamber.

[0014] Preferably, pressure balancing valves are installed on both the front serpentine pipe and the rear serpentine pipe.

[0015] Preferably, the front serpentine tube and the rear serpentine tube are cooled by a water cooler, and the heat exchanger sleeve of the water cooler is sleeved on the front serpentine tube and the rear serpentine tube.

[0016] Preferably, electric heating wires are arranged in the furnace wall of the carbonization furnace. The temperature of the carbonization furnace can be set according to heating needs. Generally, the heating temperature is 900-1500° C. and the holding time is 3-9 minutes.

[0017] Preferably, a plurality of carbonization furnaces can be arranged between the wire unwinding device and the wire collecting device according to production needs.

[0018] Preferably, a heat-insulating layer is provided on the outer wall of the carbonization furnace to reduce temperature loss.

[0019] Preferably, in order to ensure the stability of the carbonization furnace, support frames are installed on the left and right sides of the carbonization furnace respectively.

[0020] Preferably, the front serpentine tube and the rear serpentine tube are both high temperature resistant and corrosion resistant tubes, preferably tungsten alloy tubes.

[0021] The beneficial effects of the present invention are:

[0022] When in use, the polymer material filaments released by the filament releasing device pass through the front serpentine tube, the heating chamber and the rear serpentine tube in sequence and are then taken up by the filament taking-up device. The first U-shaped isolation section and the second U-shaped isolation section can isolate the air, which can save a series of operations such as preparing mixed slurry, impregnation, drying, etc., simplifying the production process, and improving the efficiency of carbon fiber preparation, which has certain promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] As shown in the figure:

[0025] 1. Wire unwinding device, 2. Front serpentine tube, 3. First U-shaped isolating section, 4. Pressure balancing valve, 5. Heat exchanger casing, 6. Carbonization furnace, 7. Electric heating wire, 8. Support frame, 9. Guide ring, 10. Support rod, 11. Exhaust port, 12. Air inlet, 13. Second U-shaped isolating section, 14. Rear serpentine tube, 15. Wire collecting device, 16. Heating chamber, 17. Temperature controller. DETAILED DESCRIPTION

[0026] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0027] like Figure 1As shown, the present invention includes a wire-releasing device 1, a wire-collecting device 15, and at least one carbonization furnace 6 arranged between the wire-releasing device 1 and the wire-collecting device 15. A front air isolation device is provided between the carbonization furnace 6 and the wire-releasing device 1, and a rear air isolation device is provided between the carbonization furnace 6 and the wire-collecting device 15. The front air isolation device includes a front serpentine tube 2, one end of which is connected to the upper end of the heating chamber 16 of the carbonization furnace 6, a first U-shaped isolation section 3 is provided on the front serpentine tube 2, and an isolation liquid for isolating air is installed in the first U-shaped isolation section 3. The rear air isolation device includes a rear serpentine tube 14, one end of which is connected to the lower end of the heating chamber 16 of the carbonization furnace 6, a second U-shaped isolation section 13 is provided on the rear serpentine tube 14, and an isolation liquid for isolating air is installed in the second U-shaped isolation section 13. The polymer material filaments released by the wire-releasing device 1 sequentially pass through the front serpentine tube 2, the heating chamber 16 and the rear serpentine tube 14 and are finally collected by the wire-collecting device 15. The present application adopts a design layout in which the wire is released on one side and collected on the other side, and the carbonization furnace 6 is located between the wire-releasing station and the wire-collecting station, so that the carbon fiber production can be carried out in an assembly line manner.

[0028] In this embodiment, the wire-releasing device 1 includes a wire-releasing roller and a wire-releasing motor for driving the wire-releasing roller to rotate, and the wire-releasing motor drives the wire-releasing roller to rotate to realize wire-releasing.

[0029] In this embodiment, the wire collecting device 15 includes a wire collecting roller and a wire collecting motor for driving the wire collecting roller to rotate, and the wire collecting is achieved by driving the wire collecting motor to rotate the wire collecting roller.

[0030] In this embodiment, the isolation liquid is a gallium-indium-tin alloy liquid.

[0031] In this embodiment, an electric heating wire 7 is arranged in the furnace wall of the carbonization furnace 6, and a temperature controller 17 is installed on the outer wall of the carbonization furnace 6. The furnace temperature of the carbonization furnace 6 can be set according to the heating needs. Under normal circumstances, the heating temperature is 900-1500°C and the holding time is 3-9 minutes.

[0032] In this embodiment, a plurality of carbonization furnaces 6 may be arranged between the wire unwinding device 1 and the wire collecting device 15 according to production needs.

[0033] In this embodiment, a heat-insulating layer is provided on the outer wall of the carbonization furnace 6 to reduce temperature loss.

[0034] In this embodiment, in order to ensure the stability of the carbonization furnace 6 , support frames 8 are installed on the left and right sides of the carbonization furnace 6 .

[0035] In this embodiment, in order to ensure that the polymer material filaments can smoothly enter and exit the heating chamber 16, a wire bracket is provided in the heating chamber 16, and the wire bracket includes a guide ring 9 for allowing the polymer material filaments to pass through, and a support rod 10 is fixed on the guide ring 9, and the support rod 10 is fixed to the inner wall of the heating chamber 16.

[0036] In this embodiment, the heating chamber 16 is an inert gas heating chamber 16 .

[0037] In this embodiment, the front serpentine tube 2 and the rear serpentine tube 14 are both high temperature resistant and corrosion resistant tubes, preferably tungsten alloy tubes.

[0038] In this embodiment, an air inlet 12 is provided at the lower end of the heating chamber 16 , and an air outlet 11 is provided at the upper end of the heating chamber 16 .

[0039] In this embodiment, pressure balancing valves 4 are installed on both the front serpentine pipe 2 and the rear serpentine pipe 14 .

[0040] In this embodiment, the front serpentine tube 2 and the rear serpentine tube 14 are cooled by a water cooler, and the heat exchanger sleeve 5 of the water cooler is sleeved on the front serpentine tube 2 and the rear serpentine tube 14.

[0041] During specific use, the polymer material filaments released by the filament releasing device 1 pass through the front serpentine tube 2, the heating chamber 16 and the rear serpentine tube 14 in sequence and are then taken up by the filament collecting device 15. The first U-shaped isolation segment 3 and the second U-shaped isolation segment 13 can isolate the air, thereby eliminating a series of operations such as preparing mixed slurry, impregnation, and drying, simplifying the production process, and improving the efficiency of carbon fiber preparation, which has certain promotion prospects.

[0042] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A special equipment for carbon fiber production, characterized in that: The invention comprises a wire-releasing device, a wire-collecting device and at least one carbonizing furnace arranged between the wire-releasing device and the wire-collecting device, a front air isolating device is arranged between the carbonizing furnace and the wire-releasing device, and a rear air isolating device is arranged between the carbonizing furnace and the wire-collecting device; the front air isolating device comprises a front serpentine tube, one end of which is connected to the upper end of the heating chamber of the carbonizing furnace, a first U-shaped isolating section is arranged on the front serpentine tube, and an isolating liquid for isolating air is installed in the U-shaped isolating section; the rear air isolating device comprises a rear serpentine tube, one end of which is connected to the lower end of the heating chamber of the carbonizing furnace, and a second A U-shaped isolation section is provided, in which an isolation liquid for isolating air is installed in the second U-shaped isolation section, and the isolation liquid is a gallium-indium-tin alloy liquid; the polymer material wire released by the wire releasing device passes through the front serpentine tube, the heating chamber and the rear serpentine tube in sequence and is then collected by the wire collecting device; a wire support is provided in the heating chamber, and the wire support includes a guide ring for the polymer material wire to pass through, a support rod is fixed on the guide ring, and the support rod is fixed to the inner wall of the heating chamber; pressure balancing valves are installed on the front serpentine tube and the rear serpentine tube; the front serpentine tube and the rear serpentine tube are cooled by a water cooler, and the heat exchanger sleeve of the water cooler is sleeved on the front serpentine tube and the rear serpentine tube.

2. The special equipment for producing carbon fiber according to claim 1, characterized in that: The wire-releasing device comprises a wire-releasing roller and a wire-releasing motor for driving the wire-releasing roller to rotate.

3. The special equipment for producing carbon fiber according to claim 2, characterized in that: The wire collecting device comprises a wire collecting roller and a wire collecting motor for driving the wire collecting roller to rotate.

4. The carbon fiber production equipment according to claim 1, characterized in that: The heating chamber is an inert gas heating chamber.

5. The special equipment for producing carbon fiber according to claim 4, characterized in that: An air inlet is arranged at the lower end of the heating chamber, and an exhaust port is arranged at the upper end of the heating chamber.

6. The carbon fiber production equipment according to claim 1, characterized in that: Support frames are installed on the left and right sides of the carbonization furnace respectively.

Images