Carbon fiber pre-oxidation device

Abstract

The utility model provides a carbon fiber pre-oxidation device which comprises a box body, two rows of rotating rollers connected in a rotating mode are arranged at the two opposite ends in the box body, carbon fiber yarn entering the box body bypasses the rotating rollers in an S shape and shuttles back and forth, an exhaust pipe is arranged at the top of the box body, and two first partition plates parallel to each other are vertically fixed between the two rows of rotating rollers in the box body; a pre-oxidation space is formed between the two first partition plates, air inlet cavities are formed in the two ends, through grooves allowing the carbon fiber filaments to penetrate through the pre-oxidation space are formed in the first partition plates, air inlet channels are formed in the positions, located between the two vertical adjacent rotating rollers, of the first partition plates, and hot air pipes communicated with the air inlet cavities are arranged on the box body. According to the carbon fiber pre-oxidation device, the hot air pipes are communicated with the air inlet cavities in the two ends of the pre-oxidation space of the box body, hot air entering the air inlet cavities can enter the pre-oxidation space through the air inlet channels and transversely flow between the two layers of carbon fiber filaments to heat and pre-oxidize the carbon fiber filaments, the contact efficiency of the hot air and the carbon fiber filaments is improved, and the carbon fiber filaments can be heated and pre-oxidized. And the pre-oxidation effect is improved.

Description

Technical Field

[0001] This application relates to carbon fiber pre-oxidation technology, and more particularly to a carbon fiber pre-oxidation apparatus. Background Technology

[0002] The purpose of carbon fiber pre-oxidation is to stabilize the fibers at high temperatures, preventing them from melting or cracking during subsequent carbonization. During pre-oxidation, the carbon fibers form a cross-linked structure, enhancing their tensile strength and modulus, thus significantly improving their mechanical properties.

[0003] The existing carbon fiber pre-oxidation device involves passing carbon fiber filaments back and forth in an S-shape inside the furnace, then introducing oxygen and hot air into the furnace from one end to pre-oxidize the carbon fiber filaments, and finally expelling the hot air from the other end of the furnace.

[0004] In existing carbon fiber pre-oxidation devices, the hot air entering the furnace box cannot be diverted to contact each layer of carbon fiber filaments along their direction, resulting in low contact efficiency between the hot air and the carbon fiber filaments. This leads to uneven heating and pre-oxidation of the carbon fiber filaments, affecting the oxidation effect and yield. Utility Model Content

[0005] This application provides a carbon fiber pre-oxidation device to solve the problem that in existing carbon fiber pre-oxidation devices, the hot air entering the furnace box cannot be diverted to contact and heat along the length of the carbon fiber filament, resulting in low contact efficiency and uneven heating.

[0006] This application provides a carbon fiber pre-oxidation device, including a housing. Two rows of rotating rollers are rotatably connected at opposite ends inside the housing. Carbon fiber filaments entering the housing pass through the rollers in an S-shape. An exhaust pipe is provided at the top of the housing. Two parallel first partitions are vertically fixed between the two rows of rollers inside the housing, forming a pre-oxidation space between the two first partitions. Air inlet chambers are formed at both ends. The first partitions are provided with through slots for carbon fiber filaments to pass through the pre-oxidation space. An air inlet channel is provided between two vertically adjacent rollers on the first partitions. A hot air pipe communicating with the air inlet chamber is provided on the housing.

[0007] Optionally, the housing is equipped with an atomizing nozzle facing the air inlet channel on the inner wall of the air inlet chamber, and the atomizing nozzle is connected to an external atomizer.

[0008] Optionally, side plates are vertically fixed inside the box on both sides along the conveying direction of the carbon fiber filaments. An exhaust port is provided between the two layers of carbon fiber filaments on the side plate. A flap valve for opening and closing is installed on the exhaust port. A pipe is connected between the side plate and the side wall of the box.

[0009] Optionally, a second partition is vertically fixed at both ends of the pre-oxidation space inside the box, the rotating roller is located between the first partition and the second partition, and the air inlet channel connects to and passes through the first partition and the second partition.

[0010] Compared with the prior art, the advantages of the carbon fiber pre-oxidation device provided in this application are:

[0011] The hot air duct is connected to the air inlet chambers at both ends of the pre-oxidation space of the chamber. The hot air entering the air inlet chamber can enter the pre-oxidation space through the air inlet channel and flow laterally between the two layers of carbon fiber filaments to heat and pre-oxidize the carbon fiber filaments, thereby improving the contact efficiency between the hot air and the carbon fiber filaments and enhancing the pre-oxidation effect of the carbon fiber filaments. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of a carbon fiber pre-oxidation device provided in one embodiment of this application;

[0014] Figure 2 A carbon fiber pre-oxidation apparatus provided in one embodiment of this application Figure 1 Top view;

[0015] Figure 3 A cross-sectional view of the EE section of a carbon fiber pre-oxidation device provided in an embodiment of this application;

[0016] Figure 4 A cross-sectional view at the FF section of a carbon fiber pre-oxidation device provided in an embodiment of this application;

[0017] Figure 5 This is a schematic diagram showing the position of the second partition plate in a carbon fiber pre-oxidation device provided in an embodiment of this application;

[0018] Figure 6 A carbon fiber pre-oxidation apparatus provided in one embodiment of this application Figure 5 Top view.

[0019] Explanation of reference numerals in the attached figures:

[0020] Box body 1; First partition 2; Rotary roller 3; Carbon fiber filament 4; Through groove 5; Air inlet channel 6; Atomizing nozzle 7; Hot air pipe 8; Exhaust pipe 9; Side plate 10; Exhaust port 11; Pipe 12; Second partition 13. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0022] like Figures 1-4 As shown, one embodiment of this application provides a carbon fiber pre-oxidation device, including a housing 1. Inside the housing 1, there are two rows of rotating rollers 3 connected at opposite ends. The carbon fiber filaments 4 entering the housing 1 pass through the rollers 3 in an S-shape. The top of the housing 1 is provided with an exhaust pipe 9. There are two parallel first partitions 2 vertically fixed between the two rows of rollers 3 inside the housing 1. A pre-oxidation space is formed between the two first partitions 2, and air inlet chambers are formed at both ends. The first partitions 2 are provided with through grooves 5 for the carbon fiber filaments 4 to pass through the pre-oxidation space. The first partitions 2 are provided with air inlet channels 6 between two vertically adjacent rollers 3. The housing 1 is provided with a hot air pipe 8 communicating with the air inlet chamber.

[0023] In use, multiple carbon fiber filaments 4 enter from one end of the housing 1 in a horizontal parallel arrangement, then shuttle back and forth in an S-shape between two rows of rotating rollers 3, and finally exit from the other end of the housing 1. Inside the housing 1, they are pre-oxidized by being heated by hot air and introduced with oxygen.

[0024] A pre-oxidation space is created within the housing 1 by using two first partitions 2, allowing the carbon fiber filaments 4 to reciprocate through the pre-oxidation space and undergo pre-oxidation. An air inlet channel 6 is opened on the first partition 2 between two vertically adjacent rotating rollers 3, the air inlet channel 6 corresponding to the position between the two layers of carbon fiber filaments 4. This allows hot air to enter the pre-oxidation space through the air inlet channel 6 and flow laterally between the two layers of carbon fiber filaments 4.

[0025] In this embodiment, the hot air pipe 8 is connected to the air inlet chambers at both ends of the pre-oxidation space of the housing 1. The hot air entering the air inlet chamber can enter the pre-oxidation space through the air inlet channel 6 and flow laterally between the two layers of carbon fiber filaments 4 to heat and pre-oxidize the carbon fiber filaments 4, thereby improving the contact efficiency between the hot air and the carbon fiber filaments 4 and increasing the effect of pre-oxidation of the carbon fiber filaments 4.

[0026] In one possible implementation, the housing 1 has an atomizing nozzle 7 mounted on the inner wall of the air inlet chamber, facing the air inlet channel 6, and the atomizing nozzle 7 is connected to an external atomizer.

[0027] While the hot air duct 8 draws air into the air inlet channel 6 through the air inlet chamber, the water mist in the atomizer is sprayed into the air inlet channel 6 through the atomizing nozzle 7, and the water mist is transported to the carbon fiber filaments 4 in the pre-oxidation space through the air intake.

[0028] The process of water mist adhering to carbon fiber filament 4 and evaporating can not only remove the charge and eliminate the static electricity generated on carbon fiber filament 4, but also promptly remove the high heat released by carbon fiber filament 4 during chemical reactions such as cyclization, oxidation and oxidative dehydrogenation, thus preventing the carbon fiber filament 4 from thermally melting.

[0029] In one possible implementation, side plates 10 are vertically fixed inside the box 1 on both sides of the conveying direction of the carbon fiber filament 4. An exhaust port 11 is provided between the two layers of carbon fiber filament 4 on the side plate 10. A flap valve for opening and closing is installed on the exhaust port 11. A pipe 12 is connected between the side plate 10 and the side wall of the box 1.

[0030] Each layer of carbon fiber filaments 4 is equipped with an exhaust port 11. Opening the flap valve of the exhaust port 11 allows the hot air or evaporated water vapor in the pre-oxidation space to be quickly discharged. The hot air enters the space between the side plate 10 and the side wall of the box 1 through the exhaust port 11 and is discharged through the pipe 12.

[0031] like Figure 5 and Figure 6 As shown, in one possible implementation, the two ends of the pre-oxidation space inside the box 1 are vertically fixed with second partitions 13, the rotating roller 3 is located between the first partition 2 and the second partition 13, and the air inlet channel 6 connects to and passes through the first partition 2 and the second partition 13.

[0032] The first partition 2 and the second partition 13 separate the roller 3 into separate cavities, reducing the continuous heating of the roller 3 by hot air and preventing the roller 3 from getting too hot.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A carbon fiber pre-oxidation device, comprising a housing (1), wherein two rows of rotating rollers (3) are rotatably connected at opposite ends inside the housing (1), and carbon fiber filaments (4) entering the housing (1) reciprocate by passing around the rotating rollers (3) in an S-shape, and an exhaust pipe (9) is provided at the top of the housing (1), characterized in that: Two parallel first partitions (2) are vertically fixed between the two rows of rotating rollers (3) inside the box (1). A pre-oxidation space is formed between the two first partitions (2), and air inlet cavities are formed at both ends. The first partition (2) is provided with a through groove (5) for the carbon fiber filament (4) to pass through the pre-oxidation space. The first partition (2) is located between two vertically adjacent rotating rollers (3) and is provided with an air inlet channel (6). The box (1) is provided with a hot air pipe (8) that communicates with the air inlet cavity.

2. The carbon fiber pre-oxidation device according to claim 1, characterized in that: The housing (1) has an atomizing nozzle (7) installed on the inner wall of the air inlet cavity, facing the air inlet channel (6), and the atomizing nozzle (7) is connected to an external atomizer.

3. The carbon fiber pre-oxidation device according to claim 2, characterized in that: A side plate (10) is vertically fixed inside the box (1) on both sides of the conveying direction of the carbon fiber filament (4). An exhaust port (11) is provided between the two layers of carbon fiber filament (4) on the side plate (10). A flap valve for opening and closing is installed on the exhaust port (11). A pipe (12) is connected between the side plate (10) and the side wall of the box (1).

4. The carbon fiber pre-oxidation device according to claim 1 or 2, characterized in that: The two ends of the pre-oxidation space inside the box (1) are vertically fixed with second partitions (13), the rotating roller (3) is located between the first partition (2) and the second partition (13), and the air inlet channel (6) connects and passes through the first partition (2) and the second partition (13).

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