Pre-oxidation equipment

Abstract

The utility model relates to the technical field of fiber production, in particular to pre-oxidation equipment which comprises an oxidation furnace and a yarn guiding device, and the oxidation furnace comprises an inlet end and an outlet end; the yarn guiding device comprises a plurality of first yarn guiding rollers arranged at the inlet end and a plurality of second yarn guiding rollers arranged at the outlet end, the first yarn guiding rollers are arranged at intervals in the first direction, the second yarn guiding rollers are arranged at intervals in the second direction, and the first direction is parallel to the second direction; any first godet and any second godet are arranged in a staggered mode in the first direction so that fibers can move in the oxidation furnace along a snakelike path, the first godets comprise flat rollers, and annular grooves are formed in the surfaces of the second godets. By means of the design, the phenomena of wire winding and doubling in the moving process of fibers are reduced, the heating area of the fibers is increased, the temperature needed by pre-oxidation of the oxidation furnace is reduced, and energy is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fiber production, and in particular to a pre-oxidation equipment. BACKGROUND

[0002] The production of carbon fibers includes the steps of polymerization, spinning, pre-oxidation, carbonization and post-processing, wherein the pre-oxidation needs to be carried out in a high-temperature environment in an oxidation furnace.

[0003] At present, the yarn guiding device of the pre-oxidation equipment is prone to yarn entanglement and yarn doubling when guiding the yarn, which reduces the heating area of the fiber and requires an increase in temperature to ensure that the product quality meets the requirements, thereby causing waste of processing cost. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the above technical problems, the present application provides a pre-oxidation equipment, which reduces the required temperature of pre-oxidation and saves processing cost.

[0005] According to some embodiments, the present application provides a pre-oxidation equipment, which comprises:

[0006] an oxidation furnace comprising an inlet end and an outlet end;

[0007] a yarn guiding device comprising a plurality of first yarn guiding rollers arranged at the inlet end and a plurality of second yarn guiding rollers arranged at the outlet end, the plurality of first yarn guiding rollers are arranged in a first direction, the plurality of second yarn guiding rollers are arranged in a second direction, the first direction is parallel to the second direction, any first yarn guiding roller and any second yarn guiding roller are arranged staggered in the first direction, so that the fiber moves along a serpentine path in the oxidation furnace, the first yarn guiding roller comprises a flat roller, and the surface of the second yarn guiding roller is provided with an annular groove.

[0008] In some embodiments of the present application, the yarn guiding device is arranged outside the oxidation furnace, a plurality of openings are formed in the first direction at the inlet end and the outlet end, and the openings are used for the fiber to pass through;

[0009] The yarn guiding device further comprises a plurality of first supports arranged at the inlet end and a plurality of second supports arranged at the outlet end, the plurality of first supports and the plurality of second supports are fixedly connected with the outer wall of the oxidation furnace, each first yarn guiding roller is installed on one first support, and each second yarn guiding roller is installed on one second support.

[0010] In some embodiments of the present application, the flat roller comprises a first roller body and a first roller shaft, the first roller body is a cylindrical structure with a flat outer surface, the first roller shaft is arranged at the axis of the first roller body, and the first roller shaft is connected with a bearing seat on the first support.

[0011] In some embodiments of the present application, the second godet roller comprises a second roller body and a second roller shaft, the second roller body is a cylindrical structure, the second roller shaft is arranged at the axial line of the second roller body, the outer surface of the second roller body is uniformly provided with a plurality of annular grooves, the plurality of annular grooves are arranged at intervals along the axial line direction of the second roller body, and the second roller shaft is connected with the bearing seat on the second support.

[0012] In some embodiments of the present application, the second godet roller comprises a first slot roller and a second slot roller, and the interval between adjacent annular grooves on the first slot roller is smaller than the interval between adjacent annular grooves on the second slot roller.

[0013] In some embodiments of the present application, the first slot roller and the second slot roller are arranged at intervals at the outlet end, and the number of the first slot rollers is less than the number of the second slot rollers.

[0014] In some embodiments of the present application, the second godet roller at the end of the serpentine path is the first slot roller.

[0015] In some embodiments of the present application, the cross-sectional diameter of the second godet roller is positively correlated with the number of fiber filaments in the fiber tow.

[0016] In some embodiments of the present application, the pre-oxidation device further comprises a driving device, the driving device is arranged at the inlet end and the outlet end, and the driving device is used to drive the first godet roller and the second godet roller to rotate.

[0017] In some embodiments of the present application, a plurality of temperature sensors are arranged on the inner wall of the oxidation furnace, the temperature sensors are electrically connected with a temperature controller, and the temperature controller is used to control the temperature in the oxidation furnace.

[0018] The pre-oxidation device provided by the present application can achieve the following beneficial technical effects:

[0019] The pre-oxidation device provided by the present application comprises a first godet roller arranged at the inlet end and a second godet roller arranged at the outlet end, the first godet roller and the second godet roller cooperate to make the fiber move along a serpentine path in the oxidation furnace, the annular grooves are arranged on the surface of the second godet roller, and the flat roller and the second godet roller with the annular grooves are arranged in cooperation, which can reduce the occurrence of winding and doubling phenomena while ensuring the spread of the fiber tow, increase the heating area, reduce the required temperature in the oxidation furnace, and save the processing cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application. In the drawings:

[0021] Figure 1 is a structural schematic diagram of a pre-oxidation equipment according to an embodiment of the application;

[0022] Figure 2 is a structural schematic diagram of a first grooved roller according to an embodiment of the application; Figure 1 is a structural schematic diagram of a middle roller according to an embodiment of the application;

[0023] Figure 3 is a structural schematic diagram of a first grooved roller according to an embodiment of the application; Figure 1

[0024] Figure 4 is a structural schematic diagram of a second grooved roller according to an embodiment of the application. Figure 1

[0025] Reference signs:

[0026] 100, an oxidation furnace;

[0027] 210, a middle roller; 2110, a first roller body; 2120, a first roller shaft; 220, a first grooved roller; 230, a second grooved roller; 240, a first support; 250, a second support; 260, an annular groove;

[0028] 300, a temperature sensor. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the embodiments of the application clearer, the technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are some but not all of the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application. It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other in any manner without conflict.

[0030] ​​The production of carbon fibers includes polymerization, spinning, pre-oxidation, carbonization and post-processing steps, wherein the pre-oxidation step refers to the process of exposing polyacrylonitrile fibers to oxygen for heat treatment before they are converted into carbon fibers, and the pre-oxidation is generally carried out at a temperature ranging from 200 to 300 DEG C for a period of several hours to several tens of hours, which can improve the structure and performance of carbon fibers and make them have better mechanical properties and high temperature resistance. Pre-oxidation is generally carried out in an oxidation furnace and the fibers are guided by a yarn guiding device. The current yarn guiding device is prone to yarn winding and yarn doubling when guiding the yarn, which reduces the heating area of the fibers and requires increasing the temperature to ensure that the product quality meets the requirements, resulting in waste of processing cost.

[0031] To solve the above problems, the pre-oxidation equipment provided by the present application is provided, which is provided with a first yarn guiding roller at the inlet end and a second yarn guiding roller at the outlet end. The first yarn guiding roller and the second yarn guiding roller cooperate to make the fibers move along a serpentine path in the oxidation furnace. By providing an annular groove on the surface of the second yarn guiding roller and cooperating the flat roller with the second yarn guiding roller provided with the annular groove, the occurrence of yarn winding and yarn doubling can be reduced while ensuring the spread of the fiber tows, increasing the heating area and reducing the required temperature in the oxidation furnace, thereby saving the processing cost.

[0032] The pre-oxidation equipment provided by the present application will be described in detail below in combination with the drawings.

[0033] An exemplary embodiment of the present application provides a pre-oxidation equipment, as shown in Figure 1 The pre-oxidation equipment includes an oxidation furnace 100 and a yarn guiding device. The oxidation furnace 100 includes an inlet end and an outlet end located on both sides of the oxidation furnace 100. The inlet end and the outlet end can be located at both ends of the oxidation furnace 100 along the x-axis direction, or at both ends of the oxidation furnace 100 along the y-axis direction.

[0034] The yarn guiding device includes a plurality of first yarn guiding rollers and a plurality of second yarn guiding rollers. The plurality of first yarn guiding rollers are arranged at the inlet end and spaced apart along a first direction, and the plurality of second yarn guiding rollers are arranged at the outlet end and spaced apart along a second direction. The first direction is parallel to the second direction. Any first yarn guiding roller and any second yarn guiding roller are staggered in the first direction to make the fibers move along a serpentine path in the oxidation furnace 100. The first yarn guiding roller includes a flat roller 210, and the surface of the second yarn guiding roller is provided with an annular groove 260.

[0035] The first guide wire roller and the second guide wire roller cooperate to make the fiber move along a serpentine path in the oxidation furnace 100, the flat roller 210 and the second guide wire roller with the annular groove 260 are cooperatively arranged, which can reduce the occurrence of winding and doubling of the fiber and ensure the spread of the fiber bundle, the above arrangement increases the heating area of the fiber, reduces the required temperature in the oxidation furnace 100, and saves the processing cost.

[0036] In some embodiments, as shown in Figure 1 The guide wire device is arranged outside the oxidation furnace 100, the inlet end and the outlet end are two ends of the oxidation furnace 100 along the x-axis direction, a plurality of openings are arranged on the inlet end and the outlet end along the y-axis direction, the plurality of openings are used for the fiber to pass through, and the extension direction of the fiber in the oxidation furnace 100 is the x-axis direction.

[0037] The guide wire device further comprises a plurality of first supports 240 arranged at the inlet end and a plurality of second supports 250 arranged at the outlet end, the plurality of first supports 240 and the plurality of second supports 250 are fixedly connected with the outer wall of the oxidation furnace 100, the first support 240 and the second support 250 are arranged between two adjacent openings, the first support 240 and the first guide wire roller correspond to each other, and the second support 250 and the second guide wire roller correspond to each other, the first support 240 is used for mounting the first guide wire roller, and the second support 250 is used for mounting the second guide wire roller.

[0038] It should be noted that, in addition to the guide wire roller at the inlet and the outlet, one guide wire roller corresponds to one opening, and the other guide wire rollers correspond to two openings, one of which is used for the fiber to pass out of the oxidation furnace 100, and the fiber completes turning under the action of the guide wire roller and then passes into the oxidation furnace 100 from the other opening.

[0039] In this embodiment, by arranging the guide wire device outside the oxidation furnace 100, the operator can check whether the winding and doubling phenomenon occurs in time, by arranging the plurality of first supports 240 and the second supports 250, the first support 240 and the second support 250, when some of the first guide wire roller and the second guide wire roller have problems, they can be replaced individually, thereby saving the processing cost.

[0040] In some embodiments, as shown in Figure 2 The flat roller 210 comprises a first roller body 2110 and a first roller shaft 2120, the first roller body 2110 is a cylindrical structure with a flat outer surface, the first roller shaft 2120 is arranged at the axis of the first roller body 2110, and the first roller shaft 2120 is connected with the bearing seat on the first support 240 to realize the rotation of the flat roller 210.

[0041] In some embodiments, as shown in Figure 3 and Figure 4 The second godet roller includes a second roller body and a second roller shaft, the second roller body is a cylindrical structure, the second roller shaft is arranged at the axis of the second roller body, the outer surface of the second roller body is uniformly provided with a plurality of annular grooves 260, the plurality of annular grooves 260 are arranged in the axial direction of the second roller body, the second roller shaft is connected with the bearing seat on the second support 250, and rotation of the second godet roller is realized.

[0042] It should be noted that the length of the first godet roller is equal to the length of the second godet roller, and since the first godet roller and the second godet roller are both cylindrical structures, the height of the cylinder is the length of the godet roller; in addition, the diameters of the circumferential surfaces of the first godet roller and the second godet roller that contact the fibers are the same, the first roller body 2110 contacts the fibers when the first godet roller is a flat roller 210, and the grooves contact the fibers when the second godet roller is a grooved roller, so the cross-sectional circular diameter of the first roller body 2110 is equal to the cross-sectional circular diameter of the annular groove 260 on the second roller body.

[0043] In some embodiments, as shown in Figures 1 to 4 The second godet roller includes a first grooved roller 220 and a second grooved roller 230, the interval between adjacent annular grooves 260 on the first grooved roller 220 is smaller than the interval between adjacent annular grooves 260 on the second grooved roller 230, that is, the density of the annular grooves 260 on the first grooved roller 220 is greater than the density of the annular grooves 260 on the second grooved roller 230.

[0044] The rotation of the second godet roller can be understood as the process of carding the fiber tows, and since there are requirements for the width (i.e., the spread) of the finished fiber tows, the first grooved roller 220 and the second grooved roller 230 are cooperatively arranged at the outlet end of the oxidation furnace 100, by arranging two grooved rollers with different annular groove 260 arrangement densities, the annular grooves 260 can achieve fiber separation, reduce the occurrence of fiber entanglement and fibering, and at the same time ensure the spread of the fiber tows without excessive fiber separation.

[0045] In some embodiments, continuing to refer to Figures 1 to 4The first groove roller 220 and the second groove roller 230 are arranged in the outlet end in an interleaved manner, and the number of the first groove roller 220 is less than the number of the second groove roller 230. Arranging more second groove rollers 230 and fewer first groove rollers 220 in the outlet end in an interleaved manner can timely avoid the occurrence of excessive fiber splitting. The interleaved arrangement is, for example, two second groove rollers 230, one first groove roller 220, and two second groove rollers 230 arranged in the first direction in sequence, and can also be, for example, one second groove roller 230, one first groove roller 220, two second groove rollers 230, and one first groove roller 220 arranged in the first direction in sequence, all of which are within the protection scope of the present application and are not just one first groove roller 220 and one second groove roller 230 arranged in an alternating manner.

[0046] In some embodiments, as shown in Figure 1 and Figure 3 , the second godet roller at the end of the serpentine path is the first groove roller 220. The last roller through which the fiber passes before leaving the oxidation furnace 100 is arranged as the first groove roller 220, further reducing the occurrence of fiber twisting and splitting and ensuring the flatness of the fiber when entering the next production process.

[0047] In some embodiments, as shown in Figure 3 and Figure 4 , the cross-sectional circular diameter of the second godet roller is positively correlated with the number of fiber filaments in the fiber tow. It should be noted that the cross-sectional circular diameter of the second godet roller refers to the cross-sectional circular diameter at the annular groove 260. For example, the cross-sectional circular diameter of the second godet roller corresponding to small tow products with a number of fiber filaments of 24 or less is 5-7 mm, and the cross-sectional circular diameter of the second godet roller corresponding to large tow products with a number of fiber filaments of more than 24 is 11-13 mm.

[0048] Adjusting the size of the second godet roller according to the number of fiber filaments in the fiber tow ensures the fiber splitting effect of the second godet roller, thereby reducing the heat required for ring formation and saving energy.

[0049] In some embodiments, as shown in Figure 1 , the oxidation device further comprises a driving device (not shown in the figure) arranged at the inlet end and the outlet end. The driving device is used to drive the first godet roller and the second godet roller to rotate at a constant speed, realizing the serpentine movement of the fiber in the oxidation furnace 100 and ensuring the full pre-oxidation.

[0050] In some embodiments, as shown in Figure 1 , a plurality of temperature sensors 300 are arranged on the inner wall of the oxidation furnace 100. The temperature sensors 300 are electrically connected with a temperature controller, and the temperature controller is used to control the temperature in the oxidation furnace 100.

[0051] The heating mode of the oxidation furnace 100 is various, including electric heating, steam, infrared, gas and circulating hot air heating, etc. A plurality of temperature sensors 300 are arranged on the inner wall of the oxidation furnace 100, and a temperature controller is arranged outside the oxidation furnace 100. The temperature sensors 300 are electrically connected with the temperature controller, and the temperature controller is electrically connected with the heating device of the oxidation furnace 100. The temperature inside the oxidation furnace 100 can be obtained and adjusted in time, so that the pre-oxidation process is ensured to be carried out smoothly.

[0052] In some embodiments, the number of the first guide rollers and the second guide rollers is equal. In the embodiment, six first guide rollers and six second guide rollers are arranged respectively. The number of the first guide rollers and the second guide rollers can be set by those skilled in the art, which is not limited herein.

[0053] In some embodiments, a heating assembly can be arranged on the first guide rollers and the second guide rollers. The temperature difference between the fibers outside the oxidation furnace 100 and the fibers inside the oxidation furnace 100 can be reduced by heating the first guide rollers and the second guide rollers. The heating assembly is, for example, a heating wire or hot steam, which is not described herein again.

[0054] In some embodiments, according to the experimental results, when the first guide rollers are arranged as the flat rollers 210 and the second guide rollers are arranged as the first grooved rollers 220, the pre-oxidation temperature required for producing the SYT49S-12K high-performance carbon fiber at a line speed of 660 m / h is shown in Table (1) as follows. When the first guide rollers are arranged as the flat rollers 210 and the second guide rollers are arranged as the first grooved rollers 220 and the second grooved rollers 230, i.e., the scheme as shown in Table (2) as follows. Figure 1

[0055] Table (1) Pre-oxidation temperature statistical table

[0056]

[0057] Table (2) Pre-oxidation temperature statistical table

[0058]

[0059] It is proved by the above experimental data that the technical scheme provided in the application ensures that the fibers are uniformly heated in the oxidation furnace 100, and effectively reduces the temperature required for pre-oxidation without affecting the performance of the fibers.

[0060] ​In the pre-oxidation of the fiber using the pre-oxidation device, the fiber tows are first threaded through the opening and are serpentine-shaped between the first guide rollers and the second guide rollers, and are arranged in the annular grooves 260 of the second guide rollers. The heating device of the oxidation furnace 100 is started, and the driving device is started to drive the first guide rollers and the second guide rollers to rotate. The fiber is fully heated, and the pre-oxidation is completed.

[0061] The pre-oxidation device provided in the present application is provided with the first guide roller at the inlet end and the second guide roller at the outlet end. The first guide roller and the second guide roller cooperate to move the fiber along a serpentine path in the oxidation furnace 100. By arranging the flat roller 210 and the second guide roller provided with the annular grooves 260, the fiber tows can be expanded while reducing the occurrence of winding and parallelizing, the heating area is increased, the required temperature in the oxidation furnace 100 is reduced, and the processing cost is saved.

[0062] The above-described content can be implemented alone or in various combinations, and these variations are within the scope of the present application.

[0063] It should be noted that in the description of the present application, the terms "upper", "lower", "front", "back", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0064] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0065] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. 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.

[0066] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0067] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A pre-oxidation apparatus, characterized by, The application relates to a pre-oxidation device for a fiber bundle. The pre-oxidation device comprises an oxidation furnace and a yarn guiding device. The oxidation furnace comprises an inlet end and an outlet end.

2. The pre-oxidation apparatus according to claim 1, wherein The yarn guiding device comprises a plurality of first yarn guiding rollers arranged at the inlet end and a plurality of second yarn guiding rollers arranged at the outlet end. The first yarn guiding rollers are arranged in a first direction, and the second yarn guiding rollers are arranged in a second direction.

3. The pre-oxidation apparatus according to claim 2, wherein The first direction is parallel to the second direction.

4. The pre-oxidation apparatus according to claim 2, wherein Any first yarn guiding roller is arranged in a staggered manner with any second yarn guiding roller in the first direction.

5. The pre-oxidation apparatus according to claim 4, wherein The first yarn guiding rollers comprise flat rollers.

6. The pre-oxidation apparatus according to claim 5, wherein The surface of the second yarn guiding rollers is provided with annular grooves.

7. The pre-oxidation apparatus according to claim 5, wherein The yarn guiding device is arranged outside the oxidation furnace.

8. The pre-oxidation apparatus according to any one of claims 1 to 7, characterized in that, The inlet end and the outlet end are both provided with a plurality of openings in the first direction.

9. The pre-oxidation apparatus according to any one of claims 1 to 7, characterized in that, The openings are used for the fiber to pass through.

10. The pre-oxidation apparatus according to any one of claims 1 to 7, characterized in that, The yarn guiding device further comprises a plurality of first supports arranged at the inlet end and a plurality of second supports arranged at the outlet end. The first supports and the second supports are fixedly connected with the outer wall of the oxidation furnace. Each first yarn guiding roller is mounted on a first support. Each second yarn guiding roller is mounted on a second support. The flat roller comprises a first roller body and a first roller shaft. The first roller body is a cylindrical structure with a flat outer surface. The first roller shaft is arranged at the axis of the first roller body. The first roller shaft is connected with a bearing seat on the first support. The second yarn guiding roller comprises a second roller body and a second roller shaft. The second roller body is a cylindrical structure. The outer surface of the second roller body is uniformly provided with a plurality of annular grooves. The annular grooves are arranged in a staggered manner along the axis of the second roller body. The second roller shaft is connected with a bearing seat on the second support. The second yarn guiding roller comprises a first groove roller and a second groove roller. The interval between adjacent annular grooves on the first groove roller is smaller than the interval between adjacent annular grooves on the second groove roller. The first groove roller and the second groove roller are arranged in a staggered manner at the outlet end. The number of the first groove rollers is smaller than the number of the second groove rollers. The second yarn guiding roller at the end of the serpentine path is the first groove roller. The cross-sectional diameter of the second yarn guiding roller is positively correlated with the number of fiber filaments in the fiber bundle. The pre-oxidation device further comprises a driving device arranged at the inlet end and the outlet end. The driving device is used for driving the first yarn guiding rollers and the second yarn guiding rollers to rotate. The inner wall of the oxidation furnace is provided with a plurality of temperature sensors. The temperature sensors are electrically connected with a temperature controller. The temperature controller is used for controlling the temperature in the oxidation furnace.

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