Heating device for tow production and pre-oxidation furnace

Abstract

The invention provides a heating device for tow production and a pre-oxidation furnace, the heating device comprises a furnace body, the two ends of the furnace body are provided with openings, and a channel communicated with the openings is arranged in the furnace body so that tows can penetrate through the furnace body; a ceramic plate is laid on the inner wall of the furnace body and covers more than 90% of the inner wall of the furnace body. In the application, the ceramic plate has the property of high temperature resistance and can bear high temperature in the pre-oxidation process of the tows, the surface of the ceramic plate is relatively smooth, and broken filaments generated by the tows are difficult to attach to the surface of the ceramic plate in the pre-oxidation process, so that in the daily cleaning and maintenance process of equipment, the service life of the ceramic plate is prolonged, and the service life of the ceramic plate is prolonged. And broken wires on the surface of the ceramic plate can be better cleaned. The ceramic plate covers more than 90% of the inner wall of the furnace body, so that the surface in the furnace body has better smoothness, most broken wires in the furnace body are positioned on the ceramic plate, the broken wires in the furnace body can be conveniently cleaned, and the cleaning difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tow production equipment, in particular, relates to a heating device for tow production and a pre-oxidation furnace. BACKGROUND

[0002] The production of carbon fibers generally needs polymerization, spinning, pre-oxidation, carbonization and graphitization. The pre-oxidation furnace is generally used for pre-oxidation. The pre-oxidation needs to be carried out in a high temperature environment. During the pre-oxidation process, the tow will produce broken filaments, which are difficult to clean in the furnace and are not conducive to the daily cleaning and maintenance of the equipment. SUMMARY

[0003] The purpose of the present application is to provide a heating device for tow production and a pre-oxidation furnace to facilitate daily cleaning and maintenance.

[0004] The embodiments of the present application are implemented as follows:

[0005] In a first aspect, the embodiments of the present application provide a heating device for tow production, comprising a furnace body, both ends of the furnace body having openings, the interior of the furnace body being provided with a channel communicating with the openings for the tow to pass through the furnace body; the inner wall of the furnace body is paved with a ceramic plate, and the ceramic plate covers more than 90% of the inner wall of the furnace body.

[0006] In the above technical solution, the ceramic plate has the property of resisting high temperature and can withstand the high temperature in the pre-oxidation process of the tow. The surface of the ceramic plate is relatively smooth, and the broken filaments produced by the tow during the pre-oxidation process are difficult to adhere to the surface of the ceramic plate. Therefore, during the daily cleaning and maintenance of the equipment, the broken filaments on the surface of the ceramic plate can be better cleaned. By covering more than 90% of the inner wall of the furnace body with the ceramic plate, the surface of the furnace body has good smoothness, and most of the broken filaments in the furnace body are located on the ceramic plate, which facilitates the cleaning of the broken filaments in the furnace body and reduces the difficulty of cleaning.

[0007] In some optional embodiments, a heating pipe is further included, both ends of the heating pipe being connected to the ceramic plate; and a temperature control unit is connected to the heating pipe.

[0008] In the above technical solution, the heating pipe can provide high temperature to heat the tow. Both ends of the heating pipe are connected to the ceramic plate, so that the heating pipe can be fixed better. The temperature control unit connected to the heating pipe can control the temperature provided by the heating pipe, so that the heating pipe provides uniform and stable temperature. Since the temperature provided by the heating pipe is uniform and stable, the product quality can be improved, the broken filaments can be reduced, and the daily cleaning and maintenance can be facilitated.

[0009] In some alternative embodiments, the ceramic plate comprises a first side guard plate and a second side guard plate, the inner wall of the furnace body comprises a first inner wall extending from one end of the opening to the other end of the opening in the horizontal direction, and a second inner wall opposite to the first inner wall, the second inner wall extending from one end of the opening to the other end of the opening; the first side guard plate is arranged on the first inner wall, and the second side guard plate is arranged on the second inner wall; one end of the heating pipe is connected to the first side guard plate, and the other end of the heating pipe is connected to the second side guard plate.

[0010] In the above technical solution, the first side guard plate and the second side guard plate are both ceramic plates, which have the property of high temperature resistance and can withstand high temperatures in the pre-oxidation process of the tow. In addition, the surface of the ceramic plate is smooth, and the broken filaments generated during the pre-oxidation process are difficult to adhere to the surface of the ceramic plate. Therefore, during the daily cleaning and maintenance of the equipment, the broken filaments on the surface of the ceramic plate can be better cleaned. By connecting the two ends of the heating pipe to the first side guard plate and the second side guard plate respectively, the ceramic plate can cover the position of the heating pipe on the inner wall of the furnace, and the ceramic plate can cover more area in the furnace. The surface in the furnace has good smoothness, and most of the broken filaments on the side of the first inner wall and the side of the second inner wall in the furnace are located on the ceramic plate, which facilitates the cleaning of the broken filaments in the furnace and reduces the difficulty of cleaning.

[0011] In some alternative embodiments, the first side guard plate and the second side guard plate are both provided with a heating pipe mounting hole, one end of the heating pipe is arranged in the heating pipe mounting hole of the first side guard plate, and the other end of the heating pipe is arranged in the corresponding heating pipe mounting hole of the second side guard plate.

[0012] In the above technical solution, by arranging one end of the heating pipe in the heating pipe mounting hole of the first side guard plate and the other end of the heating pipe in the corresponding heating pipe mounting hole of the second side guard plate, the heating pipe can be easily positioned.

[0013] In some alternative embodiments, the heating pipe comprises a first quartz tube and a heating wire arranged in the first quartz tube; one end of the first quartz tube is connected to the first side guard plate, and the other end of the first quartz tube is connected to the second side guard plate.

[0014] In the above technical solution, by arranging the heating wire in the first quartz tube, the broken filaments generated during production can be prevented from adhering to the heating wire, thereby avoiding the problem of difficult cleaning of the heating wire. The first quartz tube can withstand high temperatures, so it can be used in the heating device for pre-oxidation of the tow. In addition, the surface of the first quartz tube is smooth, and the first quartz tube is arranged outside the heating wire. Therefore, it is difficult for the broken filaments generated during production to adhere to the surface of the first quartz tube. Therefore, the heating pipe can be easily cleaned.

[0015] In some optional embodiments, a plurality of layers of the heating pipes are arranged in the furnace body in the vertical direction.

[0016] In the above technical solution, the plurality of layers of the heating pipes are arranged in the furnace body, so that the heating can be performed from multiple positions in the furnace body, and the temperature in the furnace body is more uniform. Since the temperature provided by the heating pipes is uniform, the product quality can be improved, and the broken filaments can be reduced, so that the daily cleaning and maintenance can be facilitated.

[0017] In some optional embodiments, the ceramic plate further comprises a top protective plate and a bottom protective plate, the inner wall of the furnace body comprises a top wall and a bottom wall, the top protective plate is arranged on the top wall, and the bottom protective plate is arranged on the bottom wall; the top protective plate covers more than 90% of the top wall, and the bottom protective plate covers more than 90% of the bottom wall.

[0018] In the above technical solution, the top protective plate and the bottom protective plate are both ceramic plates, which have the property of high temperature resistance and can withstand the high temperature in the pre-oxidation process of the filament bundle. In addition, the surface of the ceramic plate is relatively smooth, and the broken filaments generated in the pre-oxidation process are difficult to adhere to the surface of the ceramic plate. Therefore, during the daily cleaning and maintenance of the equipment, the broken filaments on the surface of the ceramic plate can be better cleaned. By arranging the top protective plate on the top wall and the bottom protective plate on the bottom wall, and by making the top protective plate cover more than 90% of the top wall and the bottom protective plate cover more than 90% of the bottom wall, a large area in the furnace body is covered by the ceramic plates, so that the surface in the furnace body has good smoothness, and most of the broken filaments on the side where the top wall is located and the side where the bottom wall is located in the furnace body are located on the ceramic plates. Therefore, the broken filaments in the furnace body can be easily cleaned, and the cleaning difficulty is reduced.

[0019] In some optional embodiments, a plurality of the bottom protective plates are arranged in an N×N square matrix on the bottom wall, where N≥2; a plurality of the square matrices are arranged along the extension direction of the furnace body, and the bottom protective plate located at the top corner of the square matrix is further provided with a thermometer mounting hole for mounting a thermometer and an air inlet hole for feeding process gas.

[0020] In the above technical solution, the bottom protective plates are arranged in an N×N square matrix on the bottom wall, and the thermometer mounting hole for mounting the thermometer and the air inlet hole are arranged on the bottom protective plate located at the top corner of the square matrix, so that the air inlet holes and the thermometers can be uniformly arranged on the bottom wall. On the one hand, the temperature at multiple positions in the furnace body can be detected, so that the temperature in the furnace body can be more finely controlled, and the temperature in the furnace body can be more uniform, which is beneficial to improving the product quality, reducing the broken filaments, and facilitating the daily cleaning and maintenance. On the other hand, the process gas can be fed into the furnace body from multiple positions, so that the process gas can be more uniformly distributed in the furnace body.

[0021] In some optional embodiments, the plurality of top guards are arranged in a square matrix of MxM on the top wall, where M≥2; a plurality of the square matrices are arranged along the extension direction of the furnace body; the bottom guard at the top corner of the square matrix is further provided with a thermometer mounting hole for mounting a thermometer; and the top guard at the center of the square matrix is further provided with a waste gas hole for exhaust.

[0022] In the above technical solution, the top guards are arranged in a square matrix of MxM on the bottom wall, and the thermometer mounting hole for mounting a thermometer and the waste gas hole are arranged on the bottom guard at the top corner of the square matrix, which can make the arrangement of the waste gas hole and the thermometer on the bottom wall more uniform; on the one hand, the temperature at multiple positions in the furnace body can be detected, and the temperature in the furnace body can be controlled more finely, so that the temperature in the furnace body can be more uniform, which is beneficial to improve product quality and reduce broken filaments, and facilitates daily cleaning and maintenance; on the other hand, the waste gas can be discharged in time.

[0023] In a second aspect, the embodiments of the present application provide a pre-oxidation furnace for tow production, which comprises a box body, a roller set chamber arranged in the box body, and the heating device provided in the first aspect, a plurality of heating devices are arranged side by side in the box body; both ends of the heating device are provided with the roller set chamber, and the roller set chamber is provided with a roller set, which is used to change the movement direction of the tow, so that the tow sent out from one heating device is sent into another heating device. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0025] Figure 1 The schematic diagram of the pre-oxidation furnace provided by the embodiments of the present application;

[0026] Figure 2 The internal schematic diagram of the pre-oxidation furnace provided by the embodiments of the present application;

[0027] Figure 3 The arrangement schematic diagram of the first side guard provided by the embodiments of the present application;

[0028] Figure 4 The arrangement schematic diagram of the bottom guard provided by the embodiments of the present application;

[0029] Figure 5 The arrangement schematic diagram of the top guard provided by the embodiments of the present application;

[0030] Figure 6 A structural schematic diagram of a heating pipe provided for an embodiment of the present application is shown in the figure.

[0031] Figure 7 A structural schematic diagram of a thermometer provided for an embodiment of the present application is shown in the figure.

[0032] Icon: 110 - furnace body; 121 - first side guard plate; 122 - top guard plate; 123 - bottom guard plate; 131 - heating pipe mounting hole; 132 - thermometer mounting hole; 133 - air inlet hole; 134 - exhaust hole; 141 - heating pipe; 1411 - heating wire; 1412 - first quartz tube; 142 - thermometer; 143 - second quartz tube; 150 - exhaust pipe; 200 - roller set chamber; 210 - roller set; 300 - box body; 310 - outlet; 320 - control panel; 400 - wire bundle. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of protection of the present application.

[0035] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0036] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0037] In addition, the terms "horizontal", "vertical", "overhang", and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0038] In the description of the present application, it should be further pointed out that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] The inventors of the present application found that the existing pre-oxidation furnace for carbon fiber tow production is difficult to clean the broken filaments attached to the inside of the pre-oxidation furnace during cleaning. Through the analysis of the inventors, it is found that, on the one hand, due to the uneven or unstable temperature distribution during the pre-oxidation process, broken filaments may be generated, which may float to various positions in the furnace body and adhere to the inner wall of the furnace body, and then it is difficult to clean.

[0040] Based on this, the inventors of the present application provide a pre-oxidation furnace for tow production, wherein the producible tow 400 includes carbon fibers, glass fibers, aramid fibers, boron fibers, alumina fibers, mineral fibers and silicon carbide fibers, etc., and can also be other tows 400 which need to be subjected to a pre-oxidation process during production.

[0041] As Figure 1 With Figure 2 As shown in the drawings, the pre-oxidation furnace provided by the present application includes a box body 300, a roller group chamber 200 arranged in the box body 300, and a heating device arranged in the box body 300.

[0042] The box body 300 is a shell-shaped structure at the outermost layer of the pre-oxidation furnace, constituting the appearance of the pre-oxidation furnace. As Figure 1 As shown in the drawings, the box body 300 can be a rectangular cuboid structure. An inlet for the tow 400 to enter is arranged at one end of the box body 300, and an outlet 310 for the tow 400 to pass out is arranged at the other end of the box body 300. Further, in some embodiments, the inlet for the tow 400 to enter and the outlet 310 for the tow 400 to pass out can be located at the same end of the box body 300.

[0043] In some embodiments, the box 300 is further provided with a control panel 320, through which the working parameters of the pre-oxidation furnace are set, such as adjusting the running speed of the tow 400, the pre-oxidation temperature of the tow 400, etc. Of course, the control panel 320 can also not be provided on the box 300.

[0044] The heating device provided in the present application is used to provide high temperature to heat the tow 400. In some embodiments, the heating device comprises a furnace body 110, which is used to provide a place for heating the tow 400. As shown in the figure, the furnace body 110 has openings at both ends and a channel communicating with the openings inside. Through the openings at both ends of the furnace body 110 and the channel inside, the tow 400 can pass through the furnace body 110, and the heating of the tow 400 is realized in the process of passing through the furnace body 110. The furnace body 110 can be made of metal materials such as stainless steel, or other materials. Figure 2

[0045] Further, the inner wall of the furnace body 110 is paved with a ceramic plate, and the ceramic plate covers more than 90% of the inner wall of the furnace body 110. Ceramic material is a kind of inorganic non-metallic material made of natural or synthetic compounds through shaping and high-temperature sintering, which has the advantages of high melting point, high hardness, high wear resistance, oxidation resistance, etc. Therefore, the ceramic plate has the property of high temperature resistance and can withstand the high temperature in the pre-oxidation process of the tow 400. In the embodiments provided in the present application, the ceramic plate can be made of oxide ceramic, or carbide ceramic, or boride ceramic, or nitride ceramic.

[0046] In addition, the surface of the ceramic plate is relatively smooth. By covering more than 90% of the inner wall of the furnace body 110 with the ceramic plate, the surface inside the furnace body 110 has good smoothness, and the broken filaments generated by the tow 400 in the pre-oxidation process are difficult to adhere to the surface of the ceramic plate, which can be easily separated from the surface of the ceramic plate. It is convenient to clean the broken filaments in the furnace body 110, which reduces the difficulty of cleaning. Therefore, during the daily cleaning and maintenance of the equipment, it is easy to clean the broken filaments; for example, the tow 400 is blown out of the furnace body 110 by blowing, or the tow 400 is sucked out of the furnace body 110 by suction.

[0047] Specifically, the ceramic plate covers more than 90% of the inner wall of the furnace body 110, which can be 90%, or 95%, or 100% of the inner wall of the furnace body 110.

[0048] ​In some embodiments, the heating device further includes a heating tube 141, which provides high temperature to heat the wire bundle 400. Both ends of the heating tube 141 are connected to ceramic plates, allowing it to be well secured. Furthermore, because both ends of the heating tube 141 are connected to ceramic plates, its relatively long length allows it to provide high temperature to a larger space, resulting in more uniform temperature distribution within the furnace body 110.

[0049] Furthermore, in some embodiments, the heating element 141 is also connected to a temperature control unit. The temperature control unit connected to the heating element 141 can control the temperature provided by the heating element 141, ensuring a uniform and stable temperature. Furthermore, the control unit can also be connected to the control panel 320 on the housing 300, allowing operators to adjust parameters such as the heating temperature of the heating element 141 via the control panel 320. Connecting the heating element 141 to the temperature control unit ensures a uniform and stable temperature, thus improving product quality, reducing wire breakage, and facilitating routine cleaning and maintenance. Of course, in other embodiments, the heating element 141 may not be connected to a temperature control unit.

[0050] In some implementations, such as Figure 6 As shown, the heating element 141 includes a first quartz tube 1412 and a heating wire 1411 disposed within the first quartz tube 1412. It is easy to understand that in this embodiment, heat is generated when an electric current flows through the heating wire 1411 to provide a high temperature. By connecting the heating wire 1411 to a temperature control unit, the heating temperature of the heating wire 1411 can be controlled by the temperature control unit controlling the current flowing through the heating wire 1411. This results in a uniform and stable temperature provided by the heating element 141, which helps improve product quality, reduces wire breakage, and facilitates routine cleaning and maintenance.

[0051] Quartz tubes are special industrial glass made of silicon dioxide, an excellent basic material characterized by thermal stability and good electrical insulation. Due to their good thermal stability, quartz tubes can be used in high-temperature environments where the wire bundle 400 undergoes pre-oxidation treatment. In other words, the good electrical insulation of the first quartz tube 1412 effectively insulates the internal heating wire 1411, ensuring safety. Furthermore, the smooth surface of the first quartz tube 1412 prevents broken wires from adhering to its surface.

[0052] Further, one end of the first quartz tube 1412 is closed, and the other end has an opening. The opening on the first quartz tube 1412 can be used to install the electric heating wire 1411 into the first quartz tube 1412. The end of the first quartz tube 1412 having the opening is further provided with a plug. The plug is provided with a through hole for the wire harness to pass through. After the heating wire 1411 is installed into the first quartz tube 1412, the plug is installed into the end of the first quartz tube 1412 having the opening. In this way, the heating wire 1411 can be encapsulated in the first quartz tube 1412, thereby preventing the heating wire 1411 from falling off. The through hole on the plug can be used for the wire harness to pass into the first quartz tube 1412, so as to supply power to the heating wire 1411 in the first quartz tube 1412.

[0053] In some embodiments, the inner wall of the furnace body 110 includes a first inner wall and a second inner wall arranged opposite to each other in the horizontal direction. The first inner wall extends from the opening at one end of the furnace body 110 to the opening at the other end of the furnace body 110, and the second inner wall extends from the opening at one end of the furnace body 110 to the opening at the other end of the furnace body 110. In this embodiment, the furnace body 110 has a quadrangular prism shape, and the cross section thereof is a ring-shaped structure with a rectangular shape. The wire harness 400 passes through the inside of the ring-shaped structure. In other embodiments, the furnace body 110 can also have a cylindrical shape, and the cross section thereof is a ring-shaped structure with a circular shape. The wire harness 400 passes through the inside of the ring-shaped structure. The cross section of the furnace body 110 is a section perpendicular to the extension direction of the internal passage thereof.

[0054] The ceramic plates include a first side plate 121 and a second side plate. It is understood that the first side plate 121 and the second side plate are both ceramic plates, i.e., plate-shaped structural members made of ceramic material. Therefore, the first side plate 121 and the second side plate can also withstand the high temperature in the pre-oxidation process of the wire harness 400. The first side plate 121 is arranged on the first inner wall of the furnace body 110, and the second side plate is arranged on the second inner wall of the furnace body 110. During the pre-oxidation process, the broken wires generated by the wire harness 400 are difficult to adhere to the surfaces of the first side plate 121 and the second side plate. Therefore, during the daily cleaning and maintenance of the equipment, the broken wires on the surfaces of the first side plate 121 and the second side plate can be better cleaned.

[0055] Further, the first side plate 121 covers more than 90% of the first inner wall, and the second side plate covers more than 90% of the second inner wall. In this way, most of the broken wires floating towards the first inner wall and the second inner wall are blocked by the first side plate 121 and the second side plate. Even if the broken wires adhere to the first side plate 121 and the second side plate, the broken wires on the first side plate 121 and the second side plate can be easily cleaned, thereby reducing the difficulty of cleaning.

[0056] In some embodiments, the first side guard plate 121 and the second side guard plate are both square plate structures, and have chamfers at the top corners, as shown in Figure 3 In some embodiments, the first side guard plate 121 and the second side guard plate can be obtained by chamfering a square ceramic plate. In other embodiments, the first side guard plate 121 and the second side guard plate can also be square ceramic plates without chamfers; the first side guard plate 121 and the second side guard plate can also be rectangular ceramic plates.

[0057] Further, one end of the heating pipe 141 is connected to the first side guard plate 121, and the other end is connected to the second side guard plate. Specifically, one end of the first quartz pipe 1412 in the heating pipe 141 is connected to the first side guard plate 121, and the other end is connected to the second side guard plate. In this embodiment, the first side guard plate 121 can cover the position of the heating pipe 141 on the first inner wall, so that the first side guard plate 121 can cover more area on the first inner wall; the second side guard plate can cover the position of the heating pipe 141 on the second inner wall, so that the second side guard plate can cover more area on the second inner wall; thereby reducing the cleaning difficulty inside the furnace body 110.

[0058] In some embodiments, the first side guard plate 121 and the second side guard plate are both provided with a heating pipe mounting hole 131, and one end of the heating pipe 141 is arranged in the heating pipe mounting hole 131 of the first side guard plate 121, and the other end is arranged in the corresponding heating pipe mounting hole 131 of the second side guard plate. In this embodiment, the heating pipe 141 is arranged by opening the heating pipe mounting hole 131 on the first side guard plate 121 and the second side guard plate, which can facilitate the positioning of the heating pipe 141. On the one hand, it is convenient to quickly install the heating pipe 141 to the preset position during installation; on the other hand, the heating pipe 141 is not prone to position change after being installed in place. In other embodiments, the first side guard plate 121 and the second side guard plate can also not be provided with the heating pipe mounting hole 131, and the two ends of the heating pipe 141 are directly connected to the first side guard plate 121 and the second side guard plate. Further, the end of the heating pipe 141 is located in the heating pipe mounting hole 131 and is connected to the furnace body 110, so that the heating pipe 141 is installed more firmly.

[0059] In some embodiments, a plurality of heating pipes 141 are arranged in the furnace body 110 in the vertical direction. Accordingly, as shown in Figure 3As shown, in the vertical direction, the first side guard plate 121 is provided with a plurality of heating pipe mounting holes 131. The vertical direction is the direction in which the bottom wall of the furnace body 110 points to the top wall, the bottom wall is the inner wall located below during use, and the top wall is the inner wall located above during use. By arranging multiple layers of heating pipes 141 in the furnace body 110, heating can be performed from multiple positions inside the furnace body 110, thereby making the temperature inside the furnace body 110 more uniform. The heating device provided by this embodiment is used for the pre-oxidation process of the tow 400. Since the temperature provided by the heating pipe 141 is uniform, the product quality can be improved, and the generation of broken filaments can be reduced, thereby facilitating daily cleaning and maintenance.

[0060] Further, in the extension direction of the channel, the furnace body 110 is also provided with multiple rows of heating pipes 141. Accordingly, as shown in FIG. 4, the heating pipes 141 are arranged in multiple rows in the extension direction of the channel. Figure 3 As shown, in the horizontal direction, the first side guard plate 121 is provided with a plurality of heating pipe mounting holes 131. By arranging multiple rows of heating pipes 141 in the furnace body 110, heating can be performed from multiple positions inside the furnace body 110, thereby making the temperature inside the furnace body 110 more uniform. The heating device provided by this embodiment is used for the pre-oxidation process of the tow 400. Since the temperature provided by the heating pipe 141 is uniform, the product quality can be improved, and the generation of broken filaments can be reduced, thereby facilitating daily cleaning and maintenance.

[0061] In some embodiments, the ceramic plate arranged in the furnace body 110 also includes a top guard plate 122 and a bottom guard plate 123, the top guard plate 122 is arranged on the top wall of the furnace body 110, and the bottom guard plate 123 is arranged on the bottom wall of the furnace body 110. Since the top guard plate 122 and the bottom guard plate 123 are both ceramic plates, the broken filaments on the surface of the top guard plate 122 and the bottom guard plate 123 can be better cleaned. By arranging the top guard plate 122 on the top wall and the bottom guard plate 123 on the bottom wall, and the top guard plate 122 covering more than 90% of the top wall and the bottom guard plate 123 covering more than 90% of the bottom wall, a large area inside the furnace body 110 is covered by the ceramic plate, the surface inside the furnace body 110 has good smoothness, and most of the broken filaments inside the furnace body 110 are located on the ceramic plate, which facilitates cleaning of the broken filaments inside the furnace body 110 and reduces the difficulty of cleaning.

[0062] Further, the top guard plate 122, the bottom guard plate 123, the first side guard plate 121, and the second side guard plate have the same size, which unifies the specifications, facilitates processing, and reduces the cost. In some embodiments, the top guard plate 122, the bottom guard plate 123, the first side guard plate 121, and the second side guard plate can also have different sizes.

[0063] In some embodiments, the plurality of bottom guards 123 are arranged in a square matrix of N x N on the bottom wall, where N≥2; specifically, N can be 2 or 3 or 4 or 5 or other positive integers. Figure 4 An embodiment in which N is 3 is shown, and a schematic diagram of one square matrix is shown. A plurality of square matrices are arranged along the extension direction of the furnace body 110, and the bottom guard 123 at the top corner of the square matrix is also provided with a thermometer mounting hole 132 for mounting a thermometer 142 and a gas inlet hole 133 for feeding process gas.

[0064] The pipeline for supplying process gas is connected to the gas inlet hole 133, and process gas is supplied into the furnace body 110. By arranging the gas inlet hole 133 for feeding process gas at the bottom guard 123 at the top corner of the square matrix, the distribution of the gas inlet hole 133 in the furnace body 110 can be more uniform, so that the process gas can uniformly fill the furnace body 110. The injected process gas can affect the temperature in the furnace body 110, and by arranging the thermometer mounting hole 132 for mounting the thermometer 142 at the bottom guard 123 at the top corner of the square matrix, the thermometer 142 can be arranged close to the gas inlet hole 133 after installation, and the temperature near the gas inlet hole 133 can be detected, so that the temperature in the furnace body 110 can be more finely controlled, and the temperature in the furnace body 110 can be more uniform, which is beneficial to improve product quality and reduce broken wires, so as to facilitate daily cleaning and maintenance.

[0065] In other embodiments, the thermometer mounting hole 132 for mounting the thermometer 142 and the gas inlet hole 133 can also be arranged in the bottom guard 123 at different positions in the square matrix, such as the thermometer mounting hole 132 being arranged in one bottom guard 123 and the thermometer mounting hole 132 being arranged in another adjacent bottom guard 123. In some embodiments, the thermometer mounting hole 132 and the gas inlet hole 133 can also be arranged directly in the gap between the two bottom guards 123 on the furnace body 110, i.e., the thermometer mounting hole 132 and the gas inlet hole 133 are not arranged on the bottom guard 123.

[0066] In some embodiments, the plurality of top guards 122 are arranged in a square matrix of M x M on the bottom wall, where M≥2; specifically, M can be 2 or 3 or 4 or 5 or other positive integers. Figure 5 An embodiment in which M is 3 is shown, and a schematic diagram of one square matrix is shown. A plurality of square matrices are arranged along the extension direction of the furnace body 110, and the bottom guard 123 at the top corner of the square matrix is also provided with a thermometer mounting hole 132 for mounting a thermometer 142, and the top guard 122 at the center of the square matrix is also provided with an exhaust hole 134 for exhaust.

[0067] By connecting the exhaust vent 134 to the exhaust pipe 150, the exhaust gas generated inside the furnace body 110 can be discharged. By also setting the thermometer mounting hole 132 for installing the thermometer 142 on the bottom protective plate 123 located at the top corner of the square matrix, the temperature at multiple locations inside the furnace body 110 can be detected, thereby enabling more precise control of the temperature inside the furnace body 110. This results in a more uniform temperature inside the furnace body 110, which is beneficial for improving product quality, reducing wire breakage, and facilitating daily cleaning and maintenance.

[0068] In some embodiments, the thermometer 142 is a TC thermometer, which is a thermocouple temperature sensor. It converts temperature changes into a measurable electrical signal through the thermoelectric effect. Its measurement principle is based on the thermoelectric effect: when two different metal materials (such as copper and nickel) form a temperature difference at their contact point, an electromotive force is generated. By measuring this electromotive force, the temperature change can be calculated. In other embodiments, other types of thermometers 142 may also be used.

[0069] Furthermore, such as Figure 7 As shown, in some embodiments, a second quartz tube 143 can also be provided on the outside of the thermometer 142. Since the quartz tube has good thermal stability, the second quartz tube 143 can be used in a high-temperature environment for pre-oxidizing the filament bundle 400; and the surface of the second quartz tube 143 is smooth, which can prevent broken filaments from adhering to the surface of the second quartz tube 143.

[0070] In the pre-oxidation furnace provided in this application, roller chambers 200 are provided at both ends of the heating device. Roller groups 210 are provided in the roller chambers 200. The roller groups 210 include multiple rollers, which can tension the filament bundle 400 and guide it. Furthermore, in some embodiments, the housing 300 includes multiple heating devices arranged side by side. Correspondingly, the housing 300 has multiple furnace bodies 110 arranged side by side. The filament bundle 400 passes through the multiple furnace bodies 110 in sequence under the action of the roller groups 210, so that the filament bundle 400 sent from the furnace body 110 of one heating device is sent into the furnace body 110 of another heating device.

[0071] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A heating device for tow production, characterized in that, The furnace body has openings at both ends, and a channel is arranged inside the furnace body to communicate with the openings for the passage of the wire bundle through the furnace body; the inner wall of the furnace body is paved with ceramic plates, which cover more than 90% of the inner wall of the furnace body.

2. The heating device of claim 1, wherein A heating pipe is also included, and both ends of the heating pipe are connected to the ceramic plates; the heating pipe is connected to a temperature control unit.

3. The heating device of claim 2, wherein, The ceramic plates include first and second side guards, and the inner wall of the furnace body includes a first inner wall extending in the horizontal direction from one end of the opening to the other end of the opening, and a second inner wall opposite to the first inner wall, which extends from one end of the opening to the other end of the opening; the first side guard is arranged on the first inner wall, and the second side guard is arranged on the second inner wall; one end of the heating pipe is connected to the first side guard, and the other end is connected to the second side guard.

4. The heating device of claim 3, wherein, Both the first and second side guards are provided with heating pipe mounting holes, and one end of the heating pipe is arranged in the heating pipe mounting hole of the first side guard, and the other end is arranged in the corresponding heating pipe mounting hole of the second side guard.

5. The heating device of claim 3, wherein, The heating pipe includes a first quartz pipe and a heating wire arranged in the first quartz pipe; one end of the first quartz pipe is connected to the first side guard, and the other end is connected to the second side guard.

6. The heating device of claim 2, wherein, In the vertical direction, a plurality of heating pipes are arranged inside the furnace body.

7. The heating device of claim 1, wherein, The ceramic plates also include top and bottom guards, and the inner wall of the furnace body includes a top wall and a bottom wall; the top guard is arranged on the top wall, and the bottom guard is arranged on the bottom wall; the top guard covers more than 90% of the top wall, and the bottom guard covers more than 90% of the bottom wall.

8. The heating device of claim 7, wherein, A plurality of bottom guards are arranged in an N×N square matrix on the bottom wall, where N≥2; a plurality of square matrices are arranged along the extension direction of the furnace body, and the bottom guard at the top corner of the square matrix is also provided with a thermometer mounting hole for mounting a thermometer and an air inlet hole for feeding process gas.

9. The heating device of claim 7, wherein, A plurality of top guards are arranged in an M×M square matrix on the top wall, where M≥2; a plurality of square matrices are arranged along the extension direction of the furnace body, and the bottom guard at the top corner of the square matrix is also provided with a thermometer mounting hole for mounting a thermometer, and the top guard at the center of the square matrix is also provided with an exhaust hole for exhaust.

10. A pre-oxidation furnace for tow production, characterized by, The heating device includes a box body, a roller set chamber arranged in the box body, and the heating device of any one of claims 1-9, a plurality of heating devices are arranged side by side in the box body; both ends of the heating device are provided with the roller set chamber, and the roller set chamber is provided with a roller set for changing the movement direction of the wire bundle to make the wire bundle fed out from one heating device enter another heating device.

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