A pre-oxidized fiber production apparatus and process

Abstract

This invention discloses a pre-oxidized fiber production apparatus and process, comprising a furnace body, a hot air device, and several waveguides. The furnace body is divided into an end zone one, an air inlet zone, a yarn feeding zone, an air outlet zone, and an end zone two by four mesh partitions. The waveguides are installed on the top or bottom surface of the yarn feeding zone. The hot air device includes a hot air duct, a fan, and a heater. The outlet end of the hot air duct connects to the air inlet zone, and the air inlet end connects to the air outlet zone. Both the fan and the heater are installed in the hot air duct. The heater heats the air inside the hot air duct, and the fan blows air from the air inlet end to the air outlet end of the hot air duct. The apparatus also includes heat-conducting pipes that pass through the four mesh partitions, with both ends extending into end zone one and end zone two, respectively. This invention uses a mixture of hot air and microwaves to heat and pre-oxidize the fiber, which shortens the pre-oxidation time and reduces the hot air temperature, significantly improving pre-oxidation efficiency.

Description

Technical Field

[0001] This invention relates to carbon fiber production equipment, and more specifically, to a pre-oxidized fiber production apparatus and a pre-oxidized fiber production process. Background Technology

[0002] During the production of carbon fiber, polyacrylonitrile (PAN) fibers need to undergo pre-oxidation treatment to cause the PAN precursor fibers to undergo reactions such as cyclization, dehydrogenation, and oxygen absorption, forming a heat-resistant trapezoidal six-membered ring structure to meet the requirements of subsequent processes.

[0003] During the pre-oxidation process, hot air is introduced into the pre-oxidation furnace to purge and heat the fibers, controlling the temperature within the furnace between 200℃ and 300℃ to achieve fiber pre-oxidation. Maintaining a uniform pre-oxidation environment is crucial for ensuring effective fiber pre-oxidation. However, the flow of hot air into and out of the furnace can be uneven, particularly at the inlet and outlet zones, leading to uneven heating and affecting the stability of the pre-oxidation process.

[0004] Therefore, a new solution is needed to address this problem. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pre-oxidized fiber production apparatus and production process.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A pre-oxidized fiber production device includes a furnace body, a hot air device, and several waveguides. The inner cavity of the furnace body is divided into an end zone one, an air inlet zone, a yarn feeding zone, an air outlet zone, and an end zone two by four mesh partitions. The waveguides are installed on the top or bottom surface of the yarn feeding zone.

[0008] The hot air device includes a hot air duct, a fan, and a heater. The outlet end of the hot air duct is connected to the inlet area, and the inlet end of the hot air duct is connected to the outlet area. The fan and the heater are both installed in the hot air duct. The heater is used to heat the air in the hot air duct, and the fan is used to deliver air from the inlet end to the outlet end of the hot air duct.

[0009] It also includes a heat pipe, which passes through four mesh partitions in sequence, with its two ends extending into end area one and end area two, respectively.

[0010] The present invention is further configured such that the number of waveguides is at least one column, and in a single column of waveguides, each waveguide is uniformly arranged along the width direction of the wire-running area.

[0011] The present invention is further configured such that each waveguide is uniformly arranged along the length direction of the waveguide.

[0012] The present invention is further configured such that a guide roller is installed in the first end region, and the fiber filament is input from the second end region, transported along the inner cavity of the heat-conducting pipe to the first end region, then wound around the guide roller, and transported along the inner cavity of the heat-conducting pipe to the second end region for output.

[0013] The present invention is further configured such that the end region one has an end face one opposite to the mesh partition, and also includes a plurality of waveguides two, each waveguide two being installed on the end face one and uniformly arranged along the width direction of the wire-feeding area, which can microwave heat the fiber filaments that are wound around the guide roller.

[0014] The present invention is further configured such that the height of the second waveguide is the same as the height of the guide roller, and is directly opposite the circumferential surface of the guide roller.

[0015] The invention is further configured to include a limiting roller, which is located between the guide roller and the heat-conducting pipe. The fiber filaments are wound around the limiting roller and form a wrap angle α. The direction in which the fiber filaments are wound around the limiting roller is opposite to the direction in which they are wound around the guide roller.

[0016] The present invention is further configured such that the wrap angle α is 20°-45°, and the wrap angle of the fiber filament on the guide roller is greater than 180°.

[0017] The present invention is further configured such that the outer diameter of the limiting roller is 1 / 3 to 3 / 4 of the outer diameter of the guide roller; the limiting roller is located on the side of the guide roller facing away from the second waveguide, and the guide roller can shield the second waveguide.

[0018] The present invention also provides a pre-oxidized fiber production process, which uses the pre-oxidized fiber production device as described above to pre-oxidize the fiber. In the pre-oxidation process, the fiber yarn is heated and pre-oxidized by a combination of hot air and microwave.

[0019] In summary, the present invention has the following beneficial effects:

[0020] By using a combination of hot air and microwave to heat and pre-oxidize the fibers, the pre-oxidation efficiency of the fibers can be improved, the pre-oxidation time and the temperature of the hot air can be shortened, and the pre-oxidation efficiency can be significantly improved.

[0021] By installing heat pipes in the furnace body, which run through the air inlet and outlet zones, the distribution of hot air in the air inlet and outlet zones may be turbulent. The heat pipes can separate the hot air from the fiber filaments. After being heated by the hot air, the heat pipes will become hot, and the stability of the inner cavity of the heat pipes will also increase. This allows the fiber filaments in the middle of the heat pipes to be in a heated space environment, and can be stably heated.

[0022] The heat pipe has good thermal conductivity, which enables automatic heat conduction, allowing the heat pipe to have a relatively uniform heating temperature and maintain stable and uniform heating of the heat pipe by hot air. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a pre-oxidized fiber production device in Example 1. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of a pre-oxidized fiber production device in Example 1. Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the structure of the guide roller and the limiting roller in Example 1;

[0026] Figure 4 This is a schematic diagram of a pre-oxidized fiber production device in Example 2;

[0027] Figure 5 This is a schematic diagram of the end structure of the heat pipe in Example 2;

[0028] Figure 6 This is a schematic diagram of the shielding baffle in Example 2;

[0029] Figure 7 This is a schematic diagram of a pre-oxidized fiber production device in Example 3;

[0030] Figure 8 This is a schematic diagram of the first state of a pre-oxidized fiber production device in Example 3;

[0031] Figure 9 This is a schematic diagram of the second state of a pre-oxidized fiber production device in Example 3.

[0032] Figure reference numerals: Furnace body 1; Wire feeding zone 101; Air inlet zone 102; Air outlet zone 103; End zone one 104; End face one 1041; End zone two 105; Mesh partition 2; Mesh partition one 21; Mesh partition two 22; Mesh partition three 23; Mesh partition four 24; Heat pipe 3; Waveguide one 4; Waveguide two 5; Guide roller 6; Limiting roller 7; Hot air device 8; Hot air pipeline 80; Air outlet 81; Air inlet 82; Fan 83; Heater 84; Microwave source 9; Wire outlet 106; Guide roller 107; Shielding mechanism 300; Sleeve one 301; Sleeve two 302; Mesh baffle 303; Fiber channel 304; Through hole 305;

[0033] Connecting sleeve 1 401; Connecting sleeve 2 402; Connecting port 1 403; Connecting port 2 404; Mesh partition 5 405; Stop block 406; Guide ring groove 407. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1

[0036] This embodiment discloses a pre-oxidized fiber production apparatus, referring to... Figures 1-2 As shown, it includes a furnace body 1, a hot air device 8 and several waveguides 4. Four mesh partitions 2 are installed in the inner cavity of the furnace body 1, namely mesh partition 1 21, mesh partition 22, mesh partition 3 23 and mesh partition 4 24. The mesh partitions 2 are roughly parallel and have uniformly opened mesh holes on their surfaces.

[0037] The inner cavity of the furnace body 1 is divided into end zone 104, air inlet zone 102, wire feeding zone 101, air outlet zone 103 and end zone 2 105 by four mesh partitions 2.

[0038] The hot air device 8 includes a hot air duct 80, a fan 83, and a heater 84. The outlet end 81 of the hot air duct 80 is connected to the air inlet area 102, and the air inlet end 82 of the hot air duct 80 is connected to the air outlet area 103. Both the fan 83 and the heater 84 are installed in the hot air duct 80. The heater 84 can heat the air in the hot air duct 80, and the fan 83 can deliver air from the air inlet end 82 to the air outlet end 81 of the hot air duct 80.

[0039] The hot air device 8 can generate hot air, which is sent from the air outlet 81 of the hot air duct 80 to the air inlet 102. The hot air is evenly distributed in the wire feeding area 101 after passing through the mesh partition 22. The hot air passes through the mesh partition 3 and enters the air outlet 103. The air in the air outlet 103 then re-enters the air inlet 82 of the hot air duct 80, is reheated by the heater 84, and is then input into the furnace body 1 to form a hot air circulation.

[0040] During the hot air circulation heating process, the temperature of the wire feeding zone 101 is maintained at 200-260 degrees Celsius, which can maintain a relatively balanced temperature in the wire feeding zone 101 and maintain a relatively uniform pre-oxidation environment temperature.

[0041] Inside the furnace body 1, a heat-conducting pipe 3 is installed. The heat-conducting pipe 3 is arranged along the length of the wire-feeding zone 101. The heat-conducting pipe 3 passes through four mesh partitions 2 in sequence, and its two ends extend into end zone one 104 and end zone two 105, respectively. The heat-conducting pipe 3 can be made of metal pipe, specifically stainless steel pipe.

[0042] A guide roller 6 is installed in end zone 104. The guide roller 6 can turn the fiber filament around. The fiber filament is input from end zone 2 105, transported along the inner cavity of the heat-conducting pipe 3 to end zone 104, then passes around the guide roller 6, and is transported along the inner cavity of the heat-conducting pipe 3 to end zone 2 105 for output. During the transport process, the fiber filament passes through the heat-conducting pipe 3 twice, achieving two heating processes.

[0043] At the two ends of the inner cavity of the furnace body 1 are end zone 104 and end zone 2 105, respectively. There is basically no active hot air circulation between end zone 104 and end zone 2 105 and the wire feeding zone 101. Therefore, the temperature of end zone 104 and end zone 2 105 is slightly lower than the inner cavity temperature of the middle wire feeding zone 101.

[0044] After being heated by hot air, the heat pipe 3 will become hot, and the stability of the inner cavity of the heat pipe 3 will also increase, allowing the fiber filaments in the middle of the heat pipe 3 to be in a heated spatial environment. Moreover, the heat pipe 3 can stably heat the fiber filaments in the middle. Furthermore, the two ends of the heat pipe 3 extend into the first end region 104 and the second end region 105 respectively, and are not affected by the turbulence of the air inlet region 102 and the air outlet region 103. The heat pipe 3 has good thermal conductivity and can realize automatic heat conduction, so that the heat pipe 3 can have a relatively uniform heating temperature as a whole, and can maintain stable and uniform heating of the heat pipe 3 by hot air.

[0045] During the hot air circulation process, hot air is input from the air inlet zone 102. Initially, the distribution of hot air within the air inlet zone 102 may exhibit turbulence, resulting in significant differences in air temperature and flow velocity at different locations within the air inlet zone 102. Furthermore, the fiber filaments extend from the end of the heat pipe 3 and are directly exposed in the end zone 104. Since there is no hot air turbulence in the end zone 104, it does not cause uneven heating of the fiber filaments.

[0046] In addition, several waveguides 4 are installed in the air inlet zone 102 of the furnace body 1. The waveguides 4 are installed on the top or bottom surface of the wire feeding zone 101, which can use microwaves to heat and pre-oxidize the fibers in the pre-oxidation process.

[0047] The number of waveguides 4 is at least one row, and in a single row of waveguides 4, each waveguide 4 is uniformly arranged along the width direction of the wire-walking region 101. (Refer to...) Figure 1As shown, depending on the length of the wire-feeding zone 101, multiple rows of waveguides 4 can be set, for example, 3-6 rows can be set. Each row of waveguides 4 is arranged along the length direction of the wire-feeding zone 101, which can form multiple microwave heating areas along the length direction of the wire-feeding zone 101. This can combine microwave and hot air heating to improve the efficiency of pre-oxidation heating.

[0048] Each waveguide 4 is uniformly arranged along its length. The waveguides 4 create a microwave heating zone within the wire-running area 101, forming several uniformly distributed microwave heating states. Furthermore, the heat pipe 3 within the wire-running area 101 absorbs the microwave heating effect, effectively heating the heat pipe 3 and enhancing the heating efficiency. This allows the heat pipe 3 to be simultaneously heated by hot air and microwaves, raising its temperature. Moreover, the heat pipe 3's own thermal conductivity ensures a uniform high-temperature state throughout its inner cavity.

[0049] The fiber filaments are threaded through the heat pipe 3, and the high temperature inside the heat pipe 3 allows for pre-oxidation heating of the fiber filaments. Heating is achieved by a combination of microwave and hot air, which improves the pre-oxidation efficiency of the fiber filaments. Moreover, during the pre-oxidation heating process, heat can be transferred through the heat pipe 3, enabling the heat pipe 3 to maintain a relatively uniform temperature and ensuring the uniformity of the pre-oxidation heating.

[0050] Reference Figure 1 As shown, the end region 104 has an end face 1041 opposite to the mesh partition 2, and a plurality of waveguides 5 are also installed on the end face 1041 of the end region 104. Each waveguide 5 is installed on the end face 1041 and is evenly arranged along the width direction of the wire feeding area 101, which can microwave heat the fiber filaments that pass through the guide roller 6.

[0051] Waveguide 4 and waveguide 5 have roughly the same structure, with a first end and a second end. The first end is connected to the microwave source 9, and the second end extends from the feed port on the side wall of the furnace body 1, enabling the emission of microwaves into the furnace body 1 to provide microwave-assisted heating for the fibers inside the furnace body 1. Each waveguide 5 can provide microwave heating to the fibers surrounding the guide roller 6. The microwave heating in the end region 104 can achieve heating compensation in the relatively low-temperature environment of the end region 104.

[0052] Reference Figure 1As shown, the height of waveguide 2 5 is the same as the height of guide roller 6, and it is directly opposite the circumference of guide roller 6. While the waveguide 2 5 microwaves heat the fiber filaments, the microwaves can also heat the surface of guide roller 6. Moreover, guide roller 6 can also be made of stainless steel. Under the action of microwaves, guide roller 6 can also be heated. Furthermore, due to its own thermal conductivity, guide roller 6 can maintain a relatively uniform state at all positions on its outer periphery, which can improve the uniformity of heating and pre-oxidation in end region 104.

[0053] In this embodiment, the pre-oxidized fiber production device also includes a limiting roller 7, which is located between the guide roller 6 and the heat-conducting pipe 3. The upper position of the limiting roller 7 is slightly lower than the upper position of the guide roller 6. Under the guidance of the guide roller 6 and the limiting roller 7, the fiber filaments can form two parallel strokes within the heat-conducting pipe 3. The limiting roller 7 is made of ceramic roller body, and its heating temperature is relatively lower than that of the guide roller 6 during microwave heating.

[0054] The limiting roller 7 creates a curved guide between the guide roller 6 and the heat-conducting pipe 3, allowing the fiber filaments to wrap around the limiting roller 7 and form a wrap angle α. The direction in which the fiber filaments wrap around the limiting roller 7 is opposite to the direction in which they wrap around the guide roller 6. Specifically, in this embodiment, the wrap angle α is 20°-45°, and the wrap angle of the fiber filaments on the guide roller 6 is greater than 180°.

[0055] As the fiber filaments pass over guide roller 6 and limiting roller 7, they are first heated by guide roller 6. When the pre-oxidized filaments pass over guide roller 6, they bend at a certain angle outside guide roller 6. Due to this bending state, the inner and outer surfaces of the fiber filaments experience varying degrees of stress and shrinkage. Simultaneously, the fiber filaments are heated by microwaves, and the surface of guide roller 6 also has a high temperature, enabling pre-oxidation of the fiber filaments. Under these conditions of bending and heating, the cortex on the surface undergoes different states of pre-oxidation denaturation, potentially leading to internal stress deviations on both sides of the pre-oxidized filaments and affecting their strength properties.

[0056] By setting the limiting roller 7, the winding fiber filament can be bent in the opposite direction, and the fiber filament bent by the guide roller 6 can be subjected to the opposite force. The bending state of the fiber-forming previous step is reversed, and the two bending directions are opposite, so that the force and shrinkage of the inner and outer sides of the fiber filament can be compensated in the opposite direction, so as to maintain the cortical state on both sides of the pre-oxidized fiber and quickly adjust the state on both sides of the pre-oxidized fiber to a near-uniform state.

[0057] In this embodiment, the tension of the pre-oxidized fiber is controlled at 6000-7000 cN. Moreover, when the pre-oxidized fiber passes through each guide roller 6 and the limiting roller 7, a certain tension is maintained in the fiber, which can maintain the pressure between the fiber and the corresponding roller and can compensate for the reverse bending of the pre-oxidized fiber.

[0058] In this embodiment, the outer diameter of the guide roller 6 is larger than the outer diameter of the heat pipe 3, while the outer diameter of the limiting roller 7 is slightly smaller. The outer diameter of the limiting roller 7 is 1 / 3 to 3 / 4 of the outer diameter of the guide roller 6. When the fiber filaments wrap around the limiting roller 7, they have a certain reverse wrapping length outside the limiting roller 7, thereby achieving an effective reverse bending effect, improving the bending state of the fiber filaments in both directions, and realizing reverse compensation.

[0059] The limiting roller 7 is located on the side of the guide roller 6 facing away from the second waveguide 5, and the guide roller 6 can shield the second waveguide 5. The guide roller 6 creates a barrier between the second waveguide 5 and the limiting roller 7. The guide roller 6 also shields the limiting roller 7 from microwave irradiation from the second waveguide 5, preventing direct microwave heating of the limiting roller 7. The limiting roller 7 primarily functions to bend the pre-oxidized filament in the opposite direction, preventing excessively high temperatures at the limiting roller 7 that could affect the cortical state of the pre-oxidized fiber filaments.

[0060] This embodiment also discloses a pre-oxidized fiber production process, which uses the pre-oxidized fiber production device as described above to pre-oxidize the fiber. In the pre-oxidation process, the fiber yarn is heated and pre-oxidized by a combination of hot air and microwave.

[0061] Example 2

[0062] This embodiment discloses a pre-oxidized fiber production apparatus, which is based on Embodiment 1 and further refers to... Figures 4-6 Please provide a detailed explanation.

[0063] A waveguide 5 is installed in end region 104, through which microwaves can be emitted into end region 104, filling the end region 104 with a microwave wave field. Since a heat pipe 3 is installed between end region 104 and end region 105, the microwaves in end region 104 will enter end region 105 through the heat pipe 3, and then leak out from the outlet 106 of end region 105. The leaked microwaves may damage the electronic components of the equipment and affect the normal operation of the entire equipment.

[0064] In this embodiment, the wire outlet 106 of the end region 2 105 is misaligned with the port of the heat pipe 3 to prevent microwaves leaking from the port of the heat pipe 3 from directly leaking toward the wire outlet 106.

[0065] A shielding mechanism 300 is installed at the end of the heat pipe 3 that extends into the end region 105. The shielding mechanism 300 can form a block at the end of the heat pipe 3, thereby preventing microwave leakage into the end region 105 as much as possible.

[0066] Reference Figure 5 , Figure 6As shown, the shielding mechanism 300 includes two layers of mesh baffles 303. The mesh baffles 303 on both sides are stacked one after another to block the port of the heat-conducting pipe 3, thus forming a barrier. Moreover, the mesh baffles 303 have fiber channels 304 for the passage of two fiber filaments; and several through holes 305 are formed in the mesh baffles 303. The through holes 305 are small, which can prevent microwaves from passing through and form a shield against microwaves.

[0067] Furthermore, the shielding mechanism 300 also includes a first sleeve 301 and a second sleeve 302. The inner diameter of the first sleeve 301 is adapted to the outer diameter of the heat-conducting pipe 3, and the first sleeve 301 is sealed and fitted onto the outside of the heat-conducting pipe 3. The inner diameter of the second sleeve 302 is adapted to the outer diameter of the first sleeve 301, and the second sleeve 302 is sealed and fitted onto the outside of the first sleeve 301. A mesh baffle 303 is installed on the inner circumference of the first sleeve 301, and another mesh baffle 303 is installed on the inner circumference of the second sleeve 302. Through this fitting structure, the two mesh baffles 303 can form a stacked structure.

[0068] Sleeve 2 302 is fitted around the outer periphery of sleeve 1 301, and the two can move and rotate relative to each other along their axes. By rotating and adjusting, the positions of the two layers of mesh baffles 303 and the positions of the through holes 305 can be adjusted. This adjustment allows the through holes 305 of the two sets of mesh baffles 303 to be misaligned, achieving optimal microwave blocking effect. Furthermore, the axial adjustment between sleeve 1 301 and sleeve 2 302 also allows for adjustment of the spacing between the two mesh baffles 303, thus adjusting the microwave blocking effect.

[0069] Furthermore, referring to Figure 6 As shown, the fiber channels 304 opened in the mesh baffle 303 have a two-arc structure, surrounding the rotation center of the mesh baffle 303. During the rotation adjustment of the mesh baffle 303, the fiber channels 304 can effectively make way for each other, maintaining normal fiber flow when the two mesh baffles 303 are deflected and adjusted.

[0070] By forming a barrier at the end of the heat pipe 3, microwaves can be shielded and blocked, preventing energy loss due to microwave leakage and avoiding damage to the electronic components of the device caused by leaked microwaves.

[0071] Example 3

[0072] This embodiment discloses a pre-oxidized fiber production apparatus, which is based on the above embodiment and further refers to... Figures 7-9 Detailed explanation follows.

[0073] In this embodiment, the heat pipe 3 adopts a movable structure. A connecting sleeve 401 is fixedly installed between the first mesh partition 21 and the second mesh partition 22. The two ends of the connecting sleeve 401 are respectively connected to the first mesh partition 21 and the second mesh partition 22, and pass through the heat pipe 3 along the axial direction, passing through the opposite sides of the first mesh partition 21 and the second mesh partition 22 to form a through hole. A connecting sleeve 402 is fixedly installed between the third mesh partition 23 and the fourth mesh partition 24. The structure of the connecting sleeve 402 is similar to that of the first connecting sleeve 401. The two ends of the connecting sleeve 402 are respectively connected to the third mesh partition 23 and the fourth mesh partition 24, and pass through the heat pipe 3 along the axial direction, passing through the opposite sides of the third mesh partition 23 and the fourth mesh partition 24 to form a through hole. The inner diameters of connecting sleeve 1 (401) and connecting sleeve 2 (402) are adapted to the outer diameter of the heat pipe 3, so that the heat pipe 3 can smoothly pass through connecting sleeve 1 (401) and connecting sleeve 2 (402).

[0074] After the heat pipe 3 passes through the connecting sleeve 1 401 and the connecting sleeve 2 402, the gap at the axial connection is small, and it is almost impossible for hot air to flow through. Moreover, the heat pipe 3 can slide and adjust relative to the connecting sleeve 1 401 and the connecting sleeve 2 402 along the axial direction.

[0075] Reference Figure 8 , Figure 9 As shown, a connecting port 403 penetrating the inner and outer walls is provided on the side wall of the connecting sleeve 2 402, and the connecting port 403 is located near the mesh partition 4 24. A connecting port 2 404 penetrating the inner and outer walls is provided on the outer periphery of the heat pipe 3. The heat pipe 3 can be driven to slide axially, and during the sliding process, the connecting port 2 404 is located inside the connecting sleeve 2 402, as shown in the figure. Figure 8 As shown, when heat pipe 3 slides to the left, connecting port 2 404 and connecting port 1 403 are misaligned and disconnected from each other; refer to Figure 9 As shown, when the heat pipe 3 slides to the right, the second connection port 404 is opposite to the first connection port 403, and the two are connected to each other, so that the inner cavity of the heat pipe 3, the air outlet 103 and the air inlet 82 can be connected.

[0076] A mesh partition 5 405 is provided on the side of mesh partition 3 23 facing away from mesh partition 4 24. Mesh partition 5 405 is installed on the outer periphery of heat pipe 3, and the holes of mesh partition 5 405 and mesh partition 3 23 can be staggered. Mesh partition 5 405 can move with heat pipe 3. When mesh partition 5 405 and mesh partition 3 23 are separated, a flow chamber is formed between them, and the staggered holes can maintain normal communication between the left and right sides. When mesh partition 5 405 and mesh partition 3 23 are close together, the staggered holes will achieve a sealing effect, so that the left and right sides of mesh partition 5 405 and mesh partition 3 23 are disconnected after being stacked, that is, the wire feeding area 101 and the air outlet area 103 are disconnected.

[0077] The mesh partition 405 has an annular structure and is sleeved on the outer periphery of the heat pipe 3. A guide ring groove 407 is provided on the outer periphery of the heat pipe 3. The mesh partition 405 is located at the guide ring groove 407 and can achieve normal sliding adjustment within the axial forming range of the guide ring groove 407.

[0078] A stop block 406 is also fixedly connected to the inner wall of the furnace body 1. The stop block 406 can form a block at the inner wall of the furnace body 1 and limit the axial sliding stroke of the mesh partition 405, so that the mesh partition 405 can only slide and adjust between the stop block 406 and the mesh partition 23.

[0079] When the heat pipe 3 slides to the left, the second connecting port 404 and the first connecting port 403 are misaligned. At the same time, the fifth mesh partition 405 and the third mesh partition 23 are separated from each other, and the holes of the two are misaligned. During the hot air flow process, most of the hot air flows along the length of the wire-feeding area 101 and mainly flows in the outer cavity of the heat pipe 3.

[0080] When heat pipe 3 slides to the right, connecting port 2 404 and connecting port 1 403 are misaligned. At the same time, mesh partition 5 405 and mesh partition 3 23 come closer together, with their holes misaligned, and mesh partition 5 405 and mesh partition 3 23 are separated. At this time, the left and right sides of mesh partition 3 23 will be closed. During the circulation process, most of the hot air enters the air inlet area 102 from the air outlet 81. Since the flow channel on the right side of the air inlet area 102 is basically closed, the hot air will flow through the mesh partition 21 and enter the end area 104, which can directly heat the ambient temperature in the end area 104, thereby maintaining the end area 104 within a suitable temperature range. Then, the hot air will enter the inner cavity from the end of the heat pipe 3 and flow along the left side of the heat pipe 3. At this time, due to the misalignment of the connecting port 403 and the connecting port 404, the hot air will flow out from the right end of the heat pipe 3 and enter the end area 105, which can heat the hot air entering the end area 105. Heating maintains the environment within end zone 2 105 in a suitable state. Then, hot air is returned to the air inlet 82 through the mesh partition 4 24, achieving hot air circulation. During this circulation process, the hot air can quickly heat end zone 1 104 and end zone 2 105, allowing their chamber temperatures to quickly reach the working temperature, or periodically operate in this state to maintain the temperature of both end zones. Moreover, during the heating process, hot air can flow through the inner cavity of the heat pipe 3, directly conducting heat with the fibers inside the heat pipe 3, ensuring normal heating of the fibers inside the heat pipe 3 and guaranteeing the normal progress of pre-oxidation.

[0081] When the heat pipe 3 slides between the leftmost and rightmost points, it keeps the mesh partition 405 and the mesh partition 23 close together, with their holes misaligned, thus separating them. At this time, the left and right flow channels of the wire feeding zone 101 are cut off. By adjusting the position of the heat pipe 3, it can be adjusted to a state where the connecting port 1 403 and the connecting port 2 404 are partially connected. This adjustment allows the flow of hot air from the connecting port 1 403 into the air outlet zone 103 and from the end into the end zone 2 105. The heat supply to the end zone 2 105 can be adjusted according to the air volume of the two branches, thereby regulating the temperature of the end zone 2 105 and bringing it to an appropriate temperature.

[0082] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A pre-oxidized fiber production apparatus characterized by comprising: The device comprises a furnace body (1), a hot air device (8) and a plurality of waveguide tubes (4), the inner cavity of the furnace body (1) is sequentially divided into an end part area one (104), an air inlet area (102), a wire running area (101), an air outlet area (103) and an end part area two (105) by four mesh screens (2), and the waveguide tubes (4) are installed on the top surface or the bottom surface of the wire running area (101). The hot air device (8) comprises a hot air pipeline (80), a fan (83) and a heater (84), the air outlet end (81) of the hot air pipeline (80) is communicated with the air inlet area (102), the air inlet end (82) of the hot air pipeline (80) is communicated with the air outlet area (103), the fan (83) and the heater (84) are both installed on the hot air pipeline (80), the heater (84) is used for heating the air in the hot air pipeline (80), and the fan (83) is used for sending air from the air inlet end (82) to the air outlet end (81) of the hot air pipeline (80). The device further comprises a heat conduction pipe (3), the heat conduction pipe (3) sequentially penetrates the four mesh screens (2), and the two ends of the heat conduction pipe (3) respectively extend into the end part area one (104) and the end part area two (105). The end part area one (104) is provided with a guide roller (6), the fiber yarn is input from the end part area two (105), is transported to the end part area one (104) along the inner cavity of the heat conduction pipe (3), is wound through the guide roller (6), is transported to the end part area two (105) along the inner cavity of the heat conduction pipe (3) and is output. The end part area one (104) has an end surface one (1041) opposite to the mesh screen (2), further comprises a plurality of waveguide tubes two (5), each waveguide tube two (5) is installed on the end surface one (1041) and is uniformly arranged along the width direction of the wire running area (101), and the fiber yarn wound through the guide roller (6) can be heated by microwaves.

2. The pre-oxidized fiber production apparatus according to claim 1, wherein The number of the waveguide tubes one (4) is at least one column, in the single column waveguide tube one (4), each waveguide tube one (4) is uniformly arranged along the width direction of the wire running area (101).

3. The pre-oxidized fiber production apparatus according to claim 2, wherein Each column of waveguide tubes one (4) is uniformly arranged along the length direction of the waveguide tube one (4).

4. The pre-oxidized fiber production apparatus according to claim 1, wherein The height of the waveguide tube two (5) is consistent with the height of the guide roller (6), and the waveguide tube two (5) is opposite to the peripheral surface of the guide roller (6).

5. The pre-oxidized fiber production apparatus according to claim 4, wherein Further comprising a limiting roller (7), the limiting roller (7) is located between the guide roller (6) and the heat conduction pipe (3), the fiber yarn is wound through the limiting roller (7) and forms an included angle a, and the direction of the fiber yarn wound through the limiting roller (7) is opposite to the direction of the fiber yarn wound through the guide roller (6).

6. The pre-oxidized fiber production apparatus according to claim 5, wherein The included angle a is 20°-45°, and the included angle of the fiber yarn on the guide roller (6) is greater than 180°.

7. The pre-oxidized fiber production apparatus according to claim 5, wherein The outer diameter of the limiting roller (7) is 1 / 3-3 / 4 of the outer diameter of the guide roller (6), the limiting roller (7) is located on the side of the guide roller (6) away from the waveguide tube two (5), and the guide roller (6) can shield the waveguide tube two (5).

8. A process for the production of pre-oxidized fibers, characterized in that, The pre-oxidized fiber production device of any one of claims 1-7 is used for pre-oxidizing the fiber, and in the pre-oxidation process, the fiber yarn is heated and pre-oxidized by using a hot air and microwave mixed mode.

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