Oxidation furnace heating device and carbon fiber production equipment

Abstract

The utility model relates to the technical field of carbon fiber production, in particular to an oxidizing furnace heating device and carbon fiber production equipment. The oxidation furnace heating device comprises a furnace body; the ventilation unit is arranged in the furnace body, a separator is arranged in the ventilation unit, so that a gas channel in the ventilation unit is divided into two layers which are arranged up and down and are communicated with each other, a gas inlet is formed in one layer, a gas outlet is formed in the other layer, and the gas inlet and the gas outlet are formed in the same side of the ventilation unit; a gas passage that causes gas introduced from the gas inlet to pass through the separator in a folded-back manner to the other layer; the two ends, in the fiber extending direction, of the ventilation unit are provided with fiber penetrating openings so that fibers can penetrate through the ventilation unit. And the plurality of ventilation units are arranged along the extension direction of the fiber. According to the utility model, gas can be uniformly distributed in the gas channel, so that fibers are uniformly heated in the ventilation unit, the heating uniformity of the fibers in the furnace body is improved, and the stability of each index of a product is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon fiber production, in particular to an oxidation furnace heating device and carbon fiber production equipment. Background Art

[0002] Pre-oxidation is the most important key process for preparing high-performance carbon fiber. It has an important influence on carbon fiber performance, carbonization yield and production efficiency. In order to obtain high-quality pre-oxidized fibers, it is necessary to optimize the pre-oxidation process parameters, mainly including pre-oxidation temperature, heating rate, heating time, fiber draft, heating medium, etc. Among them, the pre-oxidation temperature is an important factor affecting the tensile strength and modulus of carbon fiber. Too high temperature will cause fiber overoxidation, destroy the molecular structure of the ladder polymer, limit the formation of carbon-based plane length and stacking height in the carbonization stage, and produce a skin-core structure in the radial direction of the fiber. If the temperature is too low, the pre-oxidation is insufficient, and the pre-oxidized fibers are prone to melt during the carbonization stage, resulting in reduced carbon fiber performance.

[0003] At present, all carbon fiber manufacturers use air supply perpendicular to the fiber conveying direction or horizontal air supply from the middle to both sides to heat treat the fibers in the oxidation furnace. Since the fibers are reciprocating in the oxidation furnace, the number of wire layers in the oxidation furnace is generally set at 8 to 10 layers. It is difficult to ensure the uniformity of the heat treatment temperature of each layer of fibers in the longitudinal direction by using the vertical air supply method, and the temperature deviation is large, which seriously affects the quality of the product. And it is difficult to ensure the uniformity of the heat treatment temperature of each layer of fibers in the transverse direction by using the horizontal air supply method, which is easy to appear the situation that the temperature in the middle is high and the temperature on both sides is low, which is easy to cause the fiber skin-core structure or heat melting, resulting in product quality fluctuations and large discrete index data. In addition, there are foreign objects such as hair balls in the oxidation furnace, which are easy to cause the fibers to rub and fluff when passing through foreign objects, affecting the product quality. The existing oxidation furnace cannot realize online cleaning, and can only enter the oxidation furnace for processing after the entire line is stopped and the oxidation furnace is cooled down, which seriously affects the continuity and stability of carbon fiber production. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide an oxidation furnace heating device and carbon fiber production equipment to solve the problem that the air supply method in the existing oxidation furnace is difficult to ensure the uniformity of the fiber heat treatment temperature, thereby seriously affecting the quality of the product.

[0005] The first aspect of the utility model provides an oxidation furnace heating device, wherein the oxidation furnace heating device comprises:

[0006] A furnace body, wherein the fibers are passed through the furnace body;

[0007] A ventilation unit is arranged inside the furnace body, and a partition connected to a part of the side wall of the ventilation unit is arranged inside the ventilation unit, so that the gas channel in the ventilation unit is divided into two layers arranged up and down and connected to each other, wherein the gas channel of one layer is provided with an air inlet, and the gas channel of the other layer is provided with an air outlet, and the air inlet and the air outlet are arranged on the same side of the ventilation unit, so that the gas introduced from the air inlet is returned to the gas channel of the other layer through the partition; the ventilation unit is provided with threading openings at both ends in the direction in which the fibers extend, so that the fibers can pass through the ventilation unit;

[0008] A plurality of the ventilation units are provided, and the plurality of the ventilation units are arranged along the extending direction of the fibers.

[0009] Preferably, the fibers are reciprocated through the furnace body, so that the fibers in the furnace body are provided with multiple layers;

[0010] A plurality of the ventilation units are arranged in a rectangular array in the furnace body, and a layer of the fiber is passed through each of the ventilation units.

[0011] Preferably, the threading opening extends in a horizontal direction, and the threading opening and the gas outlet are arranged on the gas channel of the same layer.

[0012] Preferably, the partition is formed into a plate-like structure, and the partition and a part of the inner wall of the ventilation unit form a vent that connects the upper and lower layers of the gas channels;

[0013] The threading port is formed into a strip structure; the dimension of the vent in the length direction of the threading port is not less than the length dimension of the threading port.

[0014] Preferably, the oxidation furnace heating device further comprises:

[0015] The air exchange unit is connected to the ventilation unit, and the air exchange unit has a ventilation duct and a heating element arranged on the ventilation duct, and the two ends of the ventilation duct respectively form an air outlet end connected to the air inlet and a return air end connected to the air outlet.

[0016] Preferably, the oxidation furnace heating device further comprises:

[0017] The on-off piece is arranged on a path connecting the air exchange unit and the ventilation unit.

[0018] Preferably, an outer wall of the furnace body is provided with an inspection door corresponding to the ventilation unit, and opening the inspection door enables communication with the interior of the ventilation unit.

[0019] Preferably, the oxidation furnace heating device further comprises:

[0020] Folding rollers are arranged at both ends of the furnace body, and the fiber abuts against a part of the outer wall of the folding rollers, so that the fiber passing through the furnace body is folded back into the furnace body;

[0021] The return roller rotates to drive the fiber to run in the furnace body.

[0022] Preferably, the oxidation furnace heating device further comprises:

[0023] The waste gas collecting unit is communicated with the interior of the furnace body and is used for collecting the waste gas discharged from the threading port.

[0024] A second aspect of the utility model provides a carbon fiber production device, comprising the oxidation furnace heating device described in any of the above technical solutions.

[0025] Compared with the prior art, the beneficial effects of the utility model are:

[0026] In the oxidation furnace heating device of the utility model, a partition is arranged inside the ventilation unit to divide the gas channel inside the ventilation unit into two layers which are arranged up and down and connected to each other, one layer is used for air intake and the other layer is used for air outlet, and the air inlet and the air outlet are arranged on the same side of the ventilation unit, so that the gas is evenly distributed in the gas channel, thereby achieving uniform heating of the fibers in the ventilation unit, and a plurality of ventilation units are arranged along the extension direction of the fibers to refine the heating distribution area of ​​the fibers and increase the effective heating length of the oxidation furnace, so that the heat is evenly distributed in the internal space of the furnace body, thereby improving the heating uniformity of the fibers in the furnace body, ensuring that various product indicators are stable and have small fluctuations, and thus improving product quality.

[0027] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the structure of the oxidation furnace heating device provided by an embodiment of the utility model at a first viewing angle;

[0030] Figure 2 A schematic diagram of the structure of the oxidation furnace heating device provided by an embodiment of the utility model at a second viewing angle;

[0031] Figure 3 A schematic diagram of the structure of the oxidation furnace heating device provided by an embodiment of the utility model from a third viewing angle;

[0032] Figure 4 A schematic diagram of the structure of the oxidation furnace heating device provided by an embodiment of the utility model at a fourth viewing angle;

[0033] Figure 5 A structural perspective view of a ventilation unit in an oxidation furnace heating device provided in an embodiment of the utility model.

[0034] Icons: 10-furnace body; 11-inspection door; 20-ventilation unit; 21-partition; 22-gas channel; 221-air inlet; 222-air outlet; 23-threading port; 24-ventilation port; 31-ventilation duct; 311-air outlet; 312-return air outlet; 32-heating element; 33-fan; 40-on-off element; 50-return roller; 60-exhaust gas collection unit; 70-fiber. DETAILED DESCRIPTION

[0035] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0036] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0037] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0038] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0039] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0040] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0041] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0042] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0043] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0044] According to a first aspect of the present invention, an oxidation furnace heating device is provided, which includes a furnace body 10 and a ventilation unit 20 .

[0045] Hereinafter, the specific structures of the above-mentioned components of the oxidation furnace heating device according to the present embodiment will be described.

[0046] In this embodiment, if Figures 1 to 4 As shown, the furnace body 10 is formed into a box-type structure, the fiber 70 is arranged inside the furnace body 10, and the ventilation unit 20 is arranged inside the furnace body 10 for supplying gas to the inside of the furnace body 10. The gas is a heating medium to provide the required pre-oxidation temperature for the fiber 70. In this embodiment, the fiber 70 is formed into a filamentous structure.

[0047] In this embodiment, if Figure 5As shown, the ventilation unit 20 is formed into an internal hollow box structure, and a partition 21 connected to a part of the side wall of the ventilation unit 20 is arranged inside the ventilation unit 20, so that the gas channel 22 in the ventilation unit 20 is divided into two layers arranged up and down and connected to each other, and the gas channel 22 of one layer is provided with an air inlet 221, and the gas channel 22 of the other layer is provided with an air outlet 222, so that one layer is used for air intake and the other layer is used for air outlet, and the air inlet 221 and the air outlet 222 are arranged on the same side of the ventilation unit 20, so that the gas introduced by the air inlet 221 is returned to the gas channel 22 of the other layer through the partition 21, that is, the gas channel 22 in the ventilation unit 20 is formed into a U-shaped structure similar to a horizontal position, so that the gas is evenly distributed in the gas channel 22; the ventilation unit 20 is provided with threading openings 23 at both ends in the direction in which the fiber 70 extends, so that the fiber 70 passes through the ventilation unit 20, so that the fiber 70 is evenly heated in the ventilation unit 20.

[0048] In this embodiment, if Figure 1 As shown, a plurality of ventilation units 20 are provided in the furnace body 10, and the plurality of ventilation units 20 are arranged along the extension direction of the fiber 70, so that the plurality of ventilation units 20 simultaneously supply heating medium to the fiber 70, thereby refining the heating distribution area of ​​the fiber 70, making the heat evenly distributed in the internal space of the furnace body 10, thereby improving the heating uniformity of the fiber 70 in the furnace body 10, ensuring the stability of various product indicators, and improving product quality.

[0049] Furthermore, in this embodiment, if Figures 1 to 4 As shown, the fiber 70 is reciprocated through the furnace body 10, so that the fiber 70 in the furnace body 10 is provided with multiple layers. It should be noted that multiple (single filaments) or multiple bundles (multiple single filaments form a bundle with a certain width) of fibers 70 are distributed in the horizontal direction, and the ends of the fibers 70 in the length direction are reciprocated from top to bottom through the furnace body 10, so that the fibers 70 in the furnace body 10 are continuously connected and form a multi-layer structure distributed in the vertical direction; multiple ventilation units 20 are arranged in a rectangular array in the furnace body 10, that is, they are arranged in a rectangular array along the extension direction of the fibers 70 in the furnace and in the vertical direction, and a layer of fibers 70 is passed through each ventilation unit 20, so as to ensure the uniformity of heating of the fibers 70 in each ventilation unit 20, avoid the occurrence of large local temperature differences, and ensure the stability of various product indicators.

[0050] Furthermore, in this embodiment, if Figures 1 to 4As shown, the oxidation furnace heating device also includes folding rollers 50 arranged at both ends of the furnace body 10, and the fiber 70 abuts against part of the outer wall of the folding roller 50, so that the fiber 70 passing through the furnace body 10 is folded back into the furnace body 10; the folding roller 50 rotates to drive the fiber 70 to run in the furnace body 10, so as to achieve continuous production. The outer wall of the folding roller 50 is preferably formed into a cylindrical structure, so that the fiber 70 conforms to its arc-shaped outer wall to prevent the folding roller 50 from scratching or breaking the fiber 70.

[0051] It should be noted that the number of folding rollers 50 is related to the number of layers through which the fibers 70 pass, and multiple folding rollers 50 can be arranged at intervals in the vertical direction according to actual needs. In addition, the device driving the folding rollers 50 to rotate can be a motor or a cylinder.

[0052] In this embodiment, if Figure 5 As shown, the threading port 23 extends in the horizontal direction to meet the distribution requirements of multiple or multiple bundles of fibers 70 in the horizontal direction. In a preferred embodiment, the threading port 23 and the gas outlet 222 are arranged on the gas channel 22 of the same layer, so that the gas introduced from the gas inlet 221 does not blow directly on the fiber 70, but is evenly distributed in the gas channel 22 provided with the gas inlet 221 before being transferred to the next layer, thereby improving the heating uniformity of the fiber 70 in the ventilation unit 20.

[0053] It should be noted that Figure 5 The middle arrow indicates the flow direction of the gas in the gas channel 22, wherein the solid arrow is the gas inlet direction and the hollow arrow is the gas outlet direction.

[0054] Preferably, if Figure 5 As shown, the air inlet 221 is arranged above the air outlet 222 , so that the gas channel 22 where the air inlet 221 is located is located above the gas channel 22 where the air outlet 222 is located, thereby improving the uniformity of gas distribution in the gas channel 22 .

[0055] In other optional embodiments, the threading port 23 and the air inlet 221 are arranged on the gas channel 22 of the same layer, which can also meet the pre-oxidation requirements of the fiber 70. Foreign matter such as hair balls in the gas channel 22 can be brought into the gas channel 22 where the air outlet 222 is arranged along the flow direction of the gas, thereby keeping the foreign matter away from the fiber 70, effectively improving the quality problems of the fiber 70 caused by the friction between the fiber 70 and the foreign matter.

[0056] More specifically, in this embodiment, if Figure 5As shown, the partition 21 is formed into a plate-like structure. The partition 21 can be made of white steel plate. The partition 21 and part of the inner wall of the ventilation unit 20 form a vent 24 that connects the upper and lower gas channels 22, thereby ensuring the connection between the upper and lower gas channels 22. The partition 21 can be formed into a triangular or trapezoidal plate-like structure, wherein the hypotenuse forms part of the side wall of the vent 24, thereby increasing the area of ​​the vent 24 and facilitating the circulation of gas.

[0057] In this embodiment, if Figure 5 As shown, the threading port 23 is formed into a strip structure, for example, a rectangular strip structure; the dimension of the vent 24 in the length direction of the threading port 23 is not less than the length dimension of the threading port 23, that is, the threading port 23 is opened on the side wall of the vent 24, so that the gas passing through the vent 24 can cover the entire threading port 23, thereby ensuring that the fiber 70 passing through the threading port 23 into the gas channel 22 is heated evenly.

[0058] In this embodiment, if Figures 1 to 4 As shown, the oxidation furnace heating device also includes an air exchange unit connected to the ventilation unit 20, the air exchange unit has a ventilation duct 31, a heating element 32 arranged on the ventilation duct 31, and a fan 33 arranged on the ventilation duct 31, the ventilation duct 31 is formed by bending and extending the pipeline structure, the heating element 32 can be an electric heater, the gas in the ventilation duct 31 flows through the heating element 32 and can absorb heat so that the heat of the gas flowing out of the heating element 32 increases, the two ends of the ventilation duct 31 respectively form an air outlet end 311 connected to the air inlet 221 and a return air end 312 connected to the air outlet 222, the fan 33 provides a flow power for the gas in the ventilation duct 31, so that the gas flowing out of the heating element 32 is passed into the ventilation unit 20 through the air outlet end 311, and part of the gas after heating the fiber 70 will pass from the air outlet 222 to the return air end 312, so that the gas circulates in the ventilation unit 20 and the air exchange unit.

[0059] It should be noted that, in the present embodiment, the air outlet end 311 and the return air end 312 are respectively formed as tubular structures arranged one-to-one with the ventilation units 20, that is, the end of the ventilation duct 31 connected to the ventilation unit 20 is formed as a structure having multiple branch ducts, so that the air intake and air outlet of each ventilation unit 20 can be independently controlled, which is convenient for maintenance and management.

[0060] It should be further explained that the fan 33 may also be replaced by other equipment, such as an air pump, etc., as long as the gas flow in the ventilation pipeline 31 and the gas channel 22 can be achieved.

[0061] In this embodiment, if Figures 1 to 4As shown, the oxidation furnace heating device also includes a waste gas collection unit 60 connected to the inside of the furnace body 10, which is used to collect waste gas discharged from the threading port 23. The waste gas collection unit 60 can be arranged corresponding to the opening for threading on the furnace body 10, and the waste gas collection unit 60 can be a pipeline and an air pump connected to the pipeline. One end of the pipeline facing the furnace body 10 can be formed into a flared structure to increase the air intake. One end of the waste gas collection unit 60 leads to the RTO incinerator to purify the waste gas produced during the production process of the fiber 70, and finally discharge it into the atmosphere through the chimney.

[0062] In addition, in this embodiment, Figure 3 and Figure 4 As shown, the oxidation furnace heating device also includes a switch 40 arranged on the path connecting the air exchange unit and the ventilation unit 20. The switch 40 can adopt control elements such as manual valves and solenoid valves to achieve the connection or disconnection of the air exchange unit and the ventilation unit 20. When connected, the air exchange unit can continuously supply gas to the ventilation unit 20; when abnormal production occurs, the switch 40 can be closed in time to deal with the abnormal area.

[0063] In this embodiment, the switch 40 and the ventilation unit 20 are arranged in a one-to-one correspondence. In this way, when an abnormal production situation occurs, it is only necessary to close the switch 40 controlling the abnormal area accordingly, and the ventilation units 20 in other areas can still be in normal working state, thereby realizing online processing without stopping the production line or cooling down, thereby ensuring production efficiency.

[0064] Furthermore, in this embodiment, if Figure 2 As shown, the outer wall of the furnace body 10 is provided with an inspection door 11 corresponding to the ventilation unit 20. Opening the inspection door 11 can communicate with the interior of the ventilation unit 20. In this way, when an abnormality occurs in production or a blockage by foreign matter occurs, the inspection door 11 at the abnormal area can be opened for processing. In addition, the hair and silicon powder in each ventilation unit 20 can be cleaned online by opening the inspection door 11 to ensure the long-term stable operation of the oxidation furnace.

[0065] Preferably, the corresponding switch 40 is closed before opening the inspection door 11 to prevent the hot air from causing damage to the inspection personnel.

[0066] In a preferred embodiment, a plurality of inspection doors 11 are provided, and the plurality of inspection doors 11 may be arranged in a horizontal direction. The inspection doors 11 may be arranged in a one-to-one correspondence with the ventilation units 20, or one inspection door 11 may correspond to a plurality of ventilation units 20. For example, when the ventilation units 20 are arranged in a rectangular array, one inspection door 11 corresponds to a group of ventilation units 20 arranged longitudinally.

[0067] In this embodiment, if Figure 1 and Figure 2As shown, the inspection door 11 is arranged on a side away from the air inlet 221 and the exhaust port of the ventilation unit 20 to avoid interference with each other; in addition, it should be noted that the side of the ventilation unit 20 facing the inspection door 11 can be detachably connected to the main body of the ventilation unit 20 by snap-fitting, threading, etc., or the opening of the side of the ventilation unit 20 facing the inspection door 11 is directly closed by the inspection door 11, as long as the gas in the ventilation unit 20 is ensured not to leak and the inspection door 11 can be connected to the interior of the ventilation unit 20 to facilitate cleaning or handling of abnormal situations.

[0068] According to the first aspect of the utility model, an oxidation furnace heating device is provided, wherein a partition is arranged inside the ventilation unit to divide the gas channel inside the ventilation unit into two layers arranged up and down and connected to each other, one layer is used for air intake and the other layer is used for air outlet, so that the gas is evenly distributed in the gas channel, thereby achieving uniform heating of the fibers in the ventilation unit, and a plurality of ventilation units are arranged along the extension direction of the fibers to refine the heating distribution area of ​​the fibers and increase the effective heating length of the oxidation furnace, so that the heat of the gas is evenly distributed in the internal space of the furnace body, thereby improving the heating uniformity of the fibers in the furnace body, ensuring that various product indicators are stable and have small fluctuations, and thereby improving product quality.

[0069] According to a second aspect of the utility model, a carbon fiber production device is provided, comprising the oxidation furnace heating device as described above, which can ensure that the fibers are heated evenly in the furnace body, thereby improving the quality of the carbon fiber products and the production efficiency of the carbon fiber production device.

[0070] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An oxidation furnace heating device, characterized in that: The oxidation furnace heating device comprises: A furnace body, wherein the fibers are passed through the furnace body; A ventilation unit is arranged inside the furnace body, and a partition connected to a part of the side wall of the ventilation unit is arranged inside the ventilation unit, so that the gas channel in the ventilation unit is divided into two layers arranged up and down and connected to each other, wherein the gas channel of one layer is provided with an air inlet, and the gas channel of the other layer is provided with an air outlet, and the air inlet and the air outlet are arranged on the same side of the ventilation unit, so that the gas introduced from the air inlet is returned to the gas channel of the other layer through the partition; the ventilation unit is provided with threading openings at both ends in the direction in which the fibers extend, so that the fibers can pass through the ventilation unit; A plurality of the ventilation units are provided, and the plurality of the ventilation units are arranged along the extending direction of the fibers.

2. The oxidation furnace heating device according to claim 1, characterized in that: The fibers are reciprocatedly arranged in the furnace body, so that the fibers in the furnace body are arranged in multiple layers; A plurality of the ventilation units are arranged in a rectangular array in the furnace body, and a layer of the fiber is passed through each of the ventilation units.

3. The oxidation furnace heating device according to claim 1, characterized in that: The threading opening extends in a horizontal direction, and the threading opening and the gas outlet are arranged on the gas channel of the same layer.

4. The oxidation furnace heating device according to claim 1, characterized in that: The partition is formed into a plate-like structure, and the partition and a part of the inner wall of the ventilation unit form a vent that connects the upper and lower layers of the gas channels; The threading port is formed into a strip structure; the dimension of the vent in the length direction of the threading port is not less than the length dimension of the threading port.

5. The oxidation furnace heating device according to claim 1, characterized in that: The oxidation furnace heating device also includes: The air exchange unit is connected to the ventilation unit, and the air exchange unit has a ventilation duct and a heating element arranged on the ventilation duct, and the two ends of the ventilation duct respectively form an air outlet end connected to the air inlet and a return air end connected to the air outlet.

6. The oxidation furnace heating device according to claim 5, characterized in that: The oxidation furnace heating device also includes: The on-off piece is arranged on a path connecting the air exchange unit and the ventilation unit.

7. The oxidation furnace heating device according to claim 1, characterized in that: The outer wall of the furnace body is provided with an inspection door corresponding to the ventilation unit, and the inspection door can be opened to communicate with the interior of the ventilation unit.

8. The oxidation furnace heating device according to claim 1, characterized in that: The oxidation furnace heating device also includes: Folding rollers are arranged at both ends of the furnace body, and the fiber abuts against a part of the outer wall of the folding rollers, so that the fiber passing through the furnace body is folded back into the furnace body; The return roller rotates to drive the fiber to run in the furnace body.

9. The oxidation furnace heating device according to claim 1, characterized in that: The oxidation furnace heating device also includes: The waste gas collecting unit is communicated with the interior of the furnace body and is used for collecting the waste gas discharged from the threading port.

10. A carbon fiber production device, characterized in that: The invention comprises an oxidation furnace heating device as described in any one of claims 1 to 9.

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