Carbon fiber guide system and carbon fiber production line

Abstract

The utility model relates to the field of carbon fiber production, and discloses a carbon fiber guide system and a carbon fiber production line. The carbon fiber filament guiding system comprises a carbon fiber filament guiding device and a tension adjusting device, the carbon fiber filament guiding device and the tension adjusting device are sequentially arranged from front to back in the running direction of a precursor filament, and a tension monitoring mechanism used for detecting the tension of a filament bundle is arranged on the tension adjusting device. The carbon fiber guide device is connected with the tension monitoring mechanism; the carbon fiber guiding device can adjust multiple strands of carbon fiber precursors with different lengths according to the tension information detected by the tension monitoring mechanism, so that the lengths of the multiple strands of carbon fiber precursors adjusted by the carbon fiber guiding device after the carbon fiber guiding device is located behind the carbon fiber guiding device are consistent. According to the carbon fiber guiding system, the carbon fiber guiding device can accurately regulate and control the lengths of the multiple strands of precursors, so that the paths of the adjusted multiple strands of precursors running to the oxidation furnace are the same, and roller winding does not occur on the roller surfaces of metal rollers at an inlet and an outlet of the oxidation furnace.

Description

Technical Field

[0001] The utility model relates to the field of carbon fiber production, in particular to a carbon fiber drawing system and a carbon fiber production line. Background Art

[0002] In the production process of polyacrylonitrile-based large-tow carbon fiber, the raw yarn drawing is very important, which directly affects the production stability of the oxidation process. In order to increase the stable production operation time of the continuous production of large-tow carbon fiber, the raw yarn used in the production of large-tow carbon fiber is not wound in a winding tube, but in a box. However, when the number of wound raw yarns in each box is greater than 1 strand, for example, when 2 strands of raw yarns are unwound in each box, the lengths of the raw yarns are different, that is, there are long and short strands of raw yarns. Before the two strands of raw yarns are unwound to the inlet of the oxidation furnace, the tension values ​​of the two strands of raw yarns are quite different. When entering the oxidation furnace for production, it is easy to cause the phenomenon of tow winding on the metal roller surface at the inlet and outlet of the oxidation furnace.

[0003] The pre-oxidation process of polyacrylonitrile-based precursor is to heat-treat the polyacrylonitrile-based precursor for a long time under heating conditions in an air atmosphere with a certain temperature gradient. The molecular structure of the polyacrylonitrile-based precursor gradually changes from a linear macromolecule to a cross-linked network structure, becoming a fiber with a heat-resistant and stable structure. During the pre-oxidation process, chemical reactions that occur include cyclization, dehydrogenation, aromatization, oxidation, and cross-linking.

[0004] During the pre-oxidation process of polyacrylonitrile-based precursor, the precursor is de-oriented under the action of heating and the polymer macromolecular chain cyclization reaction causes certain physical and chemical shrinkage. When the pre-oxidation temperature is below 200°C, when the oriented macromolecule is above its glass transition temperature, the chain segment activity increases, causing de-orientation and physical shrinkage of the fiber. When the pre-oxidation temperature is above 200°C, the fiber undergoes a cyclization cross-linking reaction under the action of heat and oxygen, causing chemical shrinkage of the fiber. The shrinkage of the polyacrylonitrile-based precursor during the pre-oxidation process produces stress, that is, tension. Pre-oxidation treatment under certain tension conditions is a necessary condition for the preparation and production of large-tow carbon fibers. Applying tension during the pre-oxidation process of polyacrylonitrile-based precursor can prevent the relaxation of the polymer molecular chain and maintain its oriented structure. In the continuous pre-oxidation process, when the number of precursors wound in the boxing method is greater than 1 strand, and 2 strands of precursors are unwound in each box, it is necessary to control the tension of each strand to be stable, and the tension value of each strand of precursor unwound in the precursor box is close to the same, to ensure that each strand of precursor tow is smoothly drawn into the oxidation furnace.

[0005] Chinese patent application CN114457463A discloses a large-tow carbon fiber preoxidation furnace and preoxidation method, which adopts a carbon fiber preoxidation furnace, including a preoxidation furnace box, a furnace, and guide rollers; wherein the guide rollers are arranged in the furnace and are respectively located at both ends of the furnace; the preoxidation furnace box is provided with an exhaust device and an air inlet; the guide roller area is an air sealing area. This technical solution only solves the technical problem of uneven tension in different areas of the same temperature zone in the existing large-tow carbon fiber preoxidation process, but does not solve the technical problem of maintaining constant tension of the tow before the raw silk is unwound to the inlet of the first oxidation furnace.

[0006] Chinese utility model patent CN210418752U discloses a precursor tension device for auxiliary carbon fiber laying, which is used for fiber bundle laying and includes a laying head, a pressure roller is provided at the outlet end of the laying head, a traction roller is provided at the inlet end of the laying head, and a tensioning assembly is provided between the pressure roller and the traction roller. The precursor tension device for auxiliary carbon fiber laying can use tension to reflect the tension of the fiber bundle, but the pressure roller is provided at the outlet end, which is easy to cause damage to the precursor, and the tension value measured by the coordinated use of a spring and a tension sensor is adjusted, which is suitable for the production of small-bundle carbon fiber. When large-bundle carbon fiber is produced, as the number of K (1K=1000 roots) increases, the number of bundles and the bundle width also increase, the bundle tension increases, the spring is subjected to greater force and is easily deformed, affecting the accuracy of measuring the large-bundle bundle tension.

[0007] Chinese patent application CN104775186A discloses a method for preparing low-surface-defect carbon fiber, wherein the precursor of the preparation method adopts dry-jet wet-spinning polyacrylonitrile precursor, and the tension of the tow is controlled by adjusting the drafting amount at a temperature of 180-280°C, and a pre-oxidation reaction is carried out under aerobic conditions, and a pre-carbonization treatment is carried out, and then the carbon fiber product is obtained by surface treatment, sizing, drying, and winding. The preparation method is suitable for the case where the tension of each tow is consistent, and the fiber is effectively prevented from being broken during drafting by optimizing the organizational structure transformation during pre-oxidation and carbonization. However, when the tension between adjacent tows is inconsistent, during the oxidation process, the tow is difficult to control the smooth operation of the tow due to inconsistent tension during drafting, and the tow with low tension is easy to wrap around the roller surface, causing roller winding, and reducing production efficiency.

[0008] Therefore, it is urgent to provide a new carbon fiber drawing system. Utility Model Content

[0009] The purpose of the utility model is to overcome the problem in the prior art that multiple strands of raw yarn are easily entangled on the metal roller surfaces at the inlet and outlet of the oxidation furnace, and to provide a carbon fiber drawing system and a carbon fiber production line, which can realize the precise regulation of the length of the multiple strands of raw yarn by the carbon fiber drawing device, so that the adjusted multiple strands of raw yarn run along the same path to the oxidation furnace and do not entangle on the metal roller surfaces at the inlet and outlet of the oxidation furnace.

[0010] In order to achieve the above-mentioned purpose, the first aspect of the utility model provides a carbon fiber drawing device, which includes a carbon fiber drawing device and a tension adjustment device. The carbon fiber drawing device and the tension adjustment device are arranged in sequence from front to back along the running direction of the original yarn. The tension adjustment device is provided with a tension monitoring mechanism for detecting the tension of the yarn bundle, and the carbon fiber drawing device is connected to the tension monitoring mechanism; the carbon fiber drawing device can adjust multiple strands of carbon fiber original yarns with inconsistent lengths according to the tension information detected by the tension monitoring mechanism, so that the multiple strands of carbon fiber original yarns adjusted by the carbon fiber drawing device have the same length after the carbon fiber drawing device.

[0011] Preferably, the carbon fiber drawing device includes a base, a driving mechanism, a first rolling mechanism and at least one second rolling mechanism, the first rolling mechanism and at least one second rolling mechanism are arranged on the base front and back, and the driving mechanism is connected to the second rolling mechanism so as to be able to drive the second rolling mechanism to rotate around the connection point between it and the base to adjust the lengths of multiple strands of carbon fiber raw yarns after the carbon fiber drawing device to be consistent.

[0012] Preferably, the first rolling mechanism includes a first rolling structure, the second rolling mechanism includes a second rolling structure and a swing arm structure corresponding to the second rolling structure, the first rolling structure and the second rolling structure are arranged in parallel, one end of the swing arm structure is connected to the base and the other end is connected to the second rolling structure, and the driving mechanism is connected to the swing arm structure.

[0013] Preferably, with the horizontal plane as the reference plane, the rotation angle of the swing arm structure is 0-90°.

[0014] Preferably, the swing arm structure includes a first swing arm connected to the base and a second swing arm connected to the second rolling structure, and the first swing arm and the second swing arm are slidably connected.

[0015] Preferably, a slide groove is provided on one of the first swing rod and the second swing rod, and a sliding member suitable for sliding in the slide groove is connected to the other one.

[0016] Preferably, the slide groove is arranged on the second swing rod, the number of the slide grooves is two, and the two slide grooves are arranged along the length direction of the second swing rod.

[0017] Preferably, the carbon fiber drawing system further comprises a control mechanism, and the control mechanism is connected to the tension monitoring mechanism and the driving mechanism respectively.

[0018] A second aspect of the utility model provides a carbon fiber production line, which includes the carbon fiber drawing system described in the first aspect.

[0019] Preferably, the carbon fiber production line further comprises a vertical five-roller device and an oxidation furnace device, and the vertical five-roller device and the oxidation furnace device are arranged in sequence from front to back along the running direction of the precursor.

[0020] Through the above technical scheme, the carbon fiber drawing system provided by the utility model, the carbon fiber drawing device detects the tension of the tow through the tension monitoring mechanism set on the tension adjustment device, adjusts the multiple strands of carbon fiber precursors with inconsistent lengths, so that the multiple strands of carbon fiber precursors adjusted by the carbon fiber drawing device have the same length after the carbon fiber drawing device; the second rolling mechanism is precisely regulated by the tension monitoring mechanism, the accuracy of the carbon fiber drawing device is improved, and the tension value deviation rate between the multiple strands of precursors running to the inlet of the oxidation furnace device is reduced, thereby reducing the number of times the tow is wound around the roller in the oxidation production process, avoiding fire accidents caused by winding around the roller during the operation of the oxidation area and harm to the health of operators, and ensuring the safe production of carbon fiber. Moreover, it can also increase the stable production operation time of the carbon fiber drawing system, reduce the raw carbon ratio of carbon fiber production, and reduce production costs.

[0021] The carbon fiber drawing system provided by the utility model, by arranging a driving mechanism on the carbon fiber drawing device to drive the second rolling mechanism to rotate around the connection point between the second rolling mechanism and the base, adjusts the position of the rolling structure, increases the running path of the long raw yarn, and adjusts the lengths of multiple strands of carbon fiber raw yarn after the carbon fiber drawing device to be consistent; through the synergistic effect of the driving mechanism and the tension monitoring mechanism, the precise regulation of the second rolling mechanism is further improved, and the tension value deviation rate between the multiple strands of raw yarn running to the inlet of the oxidation furnace device is further reduced, thereby avoiding fire accidents caused by winding rollers during operation in the oxidation area and harm to the health of operators, thereby ensuring the safe production of carbon fiber.

[0022] Other advantages of the present invention and the technical effects of the preferred embodiments will be further described in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic implementation modes and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 It is a structural schematic diagram of a specific implementation method of the carbon fiber drawing system in the utility model;

[0025] Figure 2 It is a structural schematic diagram of another specific implementation of the carbon fiber drawing system in the utility model;

[0026] Figure 3 This utility model Figure 1 sectional view of

[0027] Figure 4 This utility model Figure 1 A top view of

[0028] Figure 5 It is a structural schematic diagram of a specific implementation of the carbon fiber drawing device in the utility model.

[0029] Description of Reference Numerals

[0030] 1-carbon fiber drawing device, 11-base, 111-base, 112-first mounting hole, 113-fourth mounting hole, 12-first rolling mechanism, 121-first rolling structure, 13-second rolling mechanism, 131-second rolling structure, 132-swing arm structure, 1321-first swing rod, 1322-second swing rod, 1323-slide, 1324-second mounting hole, 1325-third mounting hole, 1326-sixth mounting hole, 14-driving mechanism, 141-rotating shaft, 2-tension adjusting device, 21-tension monitoring mechanism, 3-oxidation furnace device, 31-first oxidation furnace, 32-second oxidation furnace, 33-third oxidation furnace, 4-tension frame, 5-raw silk loading box, 6-steel roller, 7-vertical five-roller device, 8-control mechanism. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connection" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be abutment, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] It should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0034] In the first aspect, in a basic embodiment of the present utility model, see Figure 1 The carbon fiber drawing system includes a carbon fiber drawing device 1 and a tension adjusting device 2, wherein the carbon fiber drawing device 1 and the tension adjusting device 2 are sequentially arranged from front to back along the running direction of the precursor yarn, and the tension adjusting device 2 is provided with a tension monitoring mechanism 21 for detecting the size of the yarn bundle tension, and the carbon fiber drawing device 1 is connected to the tension monitoring mechanism 21; the carbon fiber drawing device 1 can adjust multiple strands of carbon fiber precursor yarns with inconsistent lengths according to the tension information detected by the tension monitoring mechanism 21, so that the multiple strands of carbon fiber precursor yarns adjusted by the carbon fiber drawing device 1 have the same length after the carbon fiber drawing device 1.

[0035] In the utility model, the carbon fiber drawing system is applied to the production of carbon fiber; the tension adjusting device 2 can be a tension adjusting device conventionally selected in the field, which can change the drawing ratio of the filament bundle, specifically a vertical five-roller device, composed of 5 metal rollers, 2 metal side plates, and 2 support rods, the two ends of the 5 metal rollers are respectively installed on the metal side plates and fixed with nuts and bolts, one end of the support rod is installed on the metal side plate, and the other end is fixed on the platform, the roller diameter Φ2 of the metal roller ranges from: 0.05m≤Φ2≤0.15m, and the roller length L2 ranges from: 0.40m≤L2≤1.00m; the tension monitoring mechanism 21 can be arranged at the end of the tension adjusting device 2, such as the inlet end or the outlet end, and can also be arranged inside the tension adjusting device 2. Preferably, the tension monitoring mechanism 21 is arranged at the inlet end of the tension adjusting device 2; the running direction of the raw silk refers to the direction in which the raw silk enters the tension adjusting device 2 from the raw silk loading box 5 through the carbon fiber drawing device 1.

[0036] Through the carbon fiber drawing system of the above basic embodiment of the utility model, when multiple strands of raw yarn with inconsistent lengths in the raw yarn loading box 5 enter the tension adjusting device 2 through the carbon fiber drawing device 1, the tension monitoring mechanism 21 arranged on the tension adjusting device 2 detects the tension of the raw yarn bundle at this time, and the carbon fiber drawing device 1 adjusts the multiple strands of carbon fiber raw yarn with inconsistent lengths according to the tension information detected by the tension monitoring mechanism 21, so that the multiple strands of carbon fiber raw yarn adjusted by the carbon fiber drawing device 1 have the same length after the carbon fiber drawing device 1, so that the tension values ​​of different strands of raw yarn are close to the same and then run to the oxidation furnace device 3 for oxidation, which can reduce the number of times the raw yarn bundle in the raw yarn is wound around the roller in the oxidation production process, avoid fire accidents caused by winding around the roller during operation in the oxidation area and harm to the health of operators, ensure safe production, and also increase the running time of stable production, reduce the raw carbon ratio of carbon fiber production, and reduce production costs.

[0037] In the present invention, the tension monitoring mechanism 21 is a device that can detect the tension information of the yarn bundle. As a specific implementation of the tension monitoring mechanism 21, the tension monitoring mechanism 21 is a tension sensor.

[0038] In the utility model, before the precursor in the precursor loading box 5 enters the carbon fiber drawing device 1, a tension frame 4 can be arranged between the precursor loading box 5 and the carbon fiber drawing device 1 so that the surface of the fiber bundle in the precursor is not folded. As a specific implementation of the tension frame 4, the tension frame 4 adopts a three-roller structure, which is composed of 3 metal rollers, 2 metal side plates, and 2 support rods. The two ends of the 3 metal rollers are respectively installed on the metal side plates and fixed with nuts and bolts. One end of the support rod is installed on the metal side plate, and the other end is fixed on the platform. The roller diameter Φ1 of the metal roller is in the range of: 0.05m≤Φ1≤0.15m, and the roller length L1 is in the range of: 0.64m≤L1≤1.60m.

[0039] As a preferred embodiment of the carbon fiber drawing device 1, see Figure 2 The carbon fiber drawing device 1 includes a base 11, a driving mechanism 14, a first rolling mechanism 12 and at least one second rolling mechanism 13. The first rolling mechanism 12 and at least one second rolling mechanism 13 are arranged on the base 11 front and back. The driving mechanism 14 is connected to the second rolling mechanism 13 so as to be able to drive the second rolling mechanism 13 to rotate around the connection point between the second rolling mechanism 13 and the base 11 so as to adjust the lengths of the multiple strands of carbon fiber precursors after the carbon fiber drawing device 1 to be consistent. Compared with the test personnel manually rotating the second rolling mechanism 13, it is more convenient to use the driving mechanism 14 to adjust the position of the second rolling mechanism 13, saving time and effort, and improving production efficiency. When there are multiple strands of raw silk in each raw silk loading box 5 and the lengths of the multiple strands of raw silk are inconsistent, the multiple strands of raw silk enter the carbon fiber drawing device 1 from the raw silk loading box 5, among which the shorter strand of raw silk directly enters the tension adjusting device 2 through the first rolling mechanism 12, and the remaining strands of raw silk pass through the first rolling mechanism 12 and the second rolling mechanism 13 in turn before entering the tension adjusting device 2. At this time, the tension monitoring mechanism 21 can detect the tension of the yarn bundle; the carbon fiber drawing device 1 drives the second rolling mechanism 13 to rotate around the connection point with the base 11 through the driving mechanism 14 according to the tension information detected by the tension monitoring mechanism 21 to increase the running path of the yarn bundle, so that the multiple strands of raw silk adjusted by the carbon fiber drawing device 1 have the same path when running to the next device.

[0040] In the utility model, the number of the first rolling mechanism 12 is one, the number of the second rolling mechanism 13 can be one or more, and the specific number of the second rolling mechanism 13 can be adjusted according to the number of strands of the raw silk in each raw silk loading box 5. For example, if the number of strands of the raw silk in the raw silk loading box 5 is two, the number of the second rolling mechanism 13 is one; if the number of strands of the raw silk in the raw silk loading box 5 is three, the number of the second rolling mechanism 13 is two; the raw silk runs from the raw silk loading box 5 through the carbon fiber drawing device 1 to the next device, and based on the running direction of the raw silk, the first rolling mechanism 12 and at least one second rolling mechanism 13 arranged on the base 11 are arranged front and back. The front refers to the first rolling mechanism 12 close to the raw silk loading box 5, and the rear refers to the second rolling mechanism 13 away from the raw silk loading box 5, that is, the first rolling mechanism 12 is located in front of the second rolling mechanism 13.

[0041] In the present invention, there is no particular limitation on the structure of the driving mechanism 14, as long as it can achieve the effect of driving the second rolling mechanism 13 to rotate around the connection point between the second rolling mechanism 13 and the base 11. As a specific implementation of the driving mechanism 14, the driving mechanism 14 is a servo motor.

[0042] In the present invention, there is no particular limitation on the specific structure of the base 11, as long as it can achieve the effect of fixing and supporting the first rolling mechanism 12 and the second rolling mechanism 13. The base 11 can be an integrally formed part or can be formed by connecting multiple brackets. There is no particular limitation on the material of the base 11. In order to improve the stability and firmness of the carbon fiber threading device 1, the material of the base 11 can be a high-density material. Preferably, the base 11 is made of metal material or alloy material. For example, the base 11 is made of carbon steel. As a specific embodiment of the base 11, see Figure 2 The base 11 includes two bases 111 of the same structure, and the cross-sectional shape of the base 111 in the vertical direction is an inverted T shape. The first rolling mechanism 12 and the second rolling mechanism 13 are arranged between the two bases 111 to obtain the carbon fiber drawing device 1, which has a simple structure and reduces the production cost of the carbon fiber drawing device 1; moreover, in the process of drawing the precursor in the precursor loading box 5, it is also convenient for the precursor to be directly introduced from the precursor loading box 5 into the first rolling mechanism 12 from bottom to top without being blocked by the base 11.

[0043] As a preferred embodiment of the first rolling mechanism 12 and the second rolling mechanism 13, see Figure 2 The first rolling mechanism 12 includes a first rolling structure 121, the second rolling mechanism 13 includes a second rolling structure 131 and a swing arm structure 132 corresponding to the second rolling structure 131, the first rolling structure 121 and the second rolling structure 131 are arranged in parallel, one end of the swing arm structure 132 is connected to the base 11, and the other end is connected to the second rolling structure 131, and the driving mechanism 14 is connected to the swing arm structure 132. By arranging the first rolling structure 121 and the second rolling structure 131 in parallel, the running path of the strands in the raw silk can be the same when the raw silk runs from the first rolling structure 121 to the second rolling structure 131, and stable tension can be guaranteed, so as to facilitate the smooth threading of the raw silk. When multiple strands of yarn with inconsistent lengths pass through the carbon fiber drawing device 1, a shorter strand of yarn directly passes through the first rolling structure 121, and the remaining strands of yarn first pass through the first rolling structure 121 and then through the corresponding second rolling structure 131; the carbon fiber drawing device 1 drives the swing arm structure 132 to rotate and change the position of the second rolling structure 131 through the driving mechanism 14 according to the tension information detected by the tension monitoring mechanism 21, thereby increasing the running path of the yarn bundle, so that the multiple strands of yarn adjusted by the carbon fiber drawing device 1 have the same path when running to the next device.

[0044] In the present invention, the first rolling structure 121 can be connected to the base 11 by welding, or by a first rolling structure connecting member. As a specific implementation of the connection between the first rolling structure 121 and the base 11, see Figure 2The first rolling structure 121 is connected to the base 11 through a first rolling structure connector, and the first rolling structure connector includes a first mounting hole 112, bolts, and nuts provided on the base 11. The first rolling structure 121 is installed in the first mounting hole 112 on the base 11, and the first rolling structure 121 and the base 11 are fixed by bolts and nuts. This connection method is simple and convenient for the installation, maintenance, and replacement of the first rolling structure 121.

[0045] As a specific embodiment of the connection between the second rolling structure 131 and the swing arm structure 132, see Figure 1 The second rolling structure 131 is connected to the swing arm structure 132 through a second rolling structure connecting member. The second rolling structure connecting member includes a second mounting hole 1324 and a stud arranged at an end of the swing arm structure 132 away from the base 11. The end of the second rolling structure 131 is installed in the second mounting hole 1324 on the swing arm structure 132, and the swing arm structure 132 and the second rolling structure 131 are fixed by the stud. This connection method is simple and convenient for the installation, maintenance and replacement of the second rolling structure 131.

[0046] As a specific embodiment of the connection between the driving mechanism 14, the swing arm structure 132 and the base 11, see Figure 2 A rotating shaft 141 is provided on the driving mechanism 14, a fourth mounting hole 113 is provided on the base 11, and a third mounting hole 1325 is provided on one end of the swing arm structure 132 close to the base 11. The rotating shaft 141 can pass through the fourth mounting hole 113 and the third mounting hole 1325 to fix the swing arm structure 132 and the base 11. The driving mechanism 14 can drive the rotating shaft 141 to rotate, thereby changing the angle of the swing arm structure 132.

[0047] In the present invention, the rotation angle (α) of the swing arm structure 132 refers to the angle α between the swing arm structure 132 and the horizontal plane with the horizontal plane as the reference plane, see Figure 2 As a preferred embodiment of the rotation angle (α) of the swing arm structure 132, see Figure 3 , with the horizontal plane as the reference plane, the swing angle α of the swing arm structure 132 is 0-90°, specifically 0°, 30°, 60°, 90°, or any value between the above two values, which can further improve the convenience of the test personnel in operation. For example, see Figure 3 When the swing arm structure 132 is located at position A, the rotation angle α of the swing arm structure 132 is 0°; when the swing arm structure 132 is located at position B, the rotation angle α of the swing arm structure 132 is 90°.

[0048] In the present invention, the length of the swing arm structure 132 can be fixed, extended, or shortened. As a preferred embodiment of the swing arm structure 132, see Figure 4 The swing arm structure 132 includes a first swing rod 1321 connected to the base 11 and a second swing rod 1322 connected to the second rolling structure 131. The first swing rod 1321 and the second swing rod 1322 are slidably connected. On the basis of adjusting the rotation angle of the swing arm structure 132, combined with the adjustment of the length of the swing arm structure 132, the position of the second rolling structure 131 can be adjusted, making the operation more convenient and flexible, and improving the accuracy of the carbon fiber drawing device 1 in adjusting the length of multiple strands of inconsistent lengths.

[0049] As a preferred embodiment of the connection between the first rocker arm 1321 and the second rocker arm 1322, a slide groove 1323 is provided on one of the first rocker arm 1321 and the second rocker arm 1322, and a sliding member suitable for sliding in the slide groove 1323 is connected to the other, so that the first rocker arm 1321 and the second rocker arm 1322 can be extended and retracted in the length direction of the two.

[0050] In the utility model, the sliding member may include a threaded column arranged on the first rocker arm 1321 or the second rocker arm 1322 and a nut matched with the column. After the length of the rocker arm structure 132 is adjusted, the column is passed through the slide groove 1323 and the nut is installed to fix the first rocker arm 1321 and the second rocker arm 1322; the sliding member may also include a sixth mounting hole 1326, a bolt and a nut arranged on the first rocker arm 1321 or the second rocker arm 1322. After the length of the rocker arm structure 132 is adjusted, the bolt is passed through the sixth mounting hole 1326 and the slide groove 1323 and the nut is installed to fix the first rocker arm 1321 and the second rocker arm 1322.

[0051] As a specific embodiment of the connection between the first swing rod 1321 and the second swing rod 1322, see Figure 2 and Figure 3 The slide groove 1323 is arranged on the second swing rod 1322, and the number of the slide grooves 1323 is two, and the two slide grooves 1323 are arranged along the length direction of the second swing rod 1322 to achieve the movement of the second swing rod 1322 in the length direction thereof, thereby changing the length of the swing arm structure 132. Moreover, the provision of the two slide grooves 1323 further improves the firmness of the connection between the first swing rod 1321 and the second swing rod 1322.

[0052] As a specific implementation of the swing arm structure 132, the length (L3) of the slide groove 1323 is in the range of: 0.10m≤L3≤0.40m, the length of the first swing rod 1321 and the second swing rod 1322 are the same and the length (L4) is in the range of: 0.40m≤L4≤1.00m, at this time, the retractable length (L5) of the swing arm structure 132 is in the range of: L4≤L5≤L4+L3.

[0053] In the present invention, each second rolling structure 131 may be provided with one swing arm structure 132, or may be provided with two swing arm structures 132. As a specific implementation of the swing arm structure 132, each second rolling structure 131 is provided with two swing arm structures 132, and the two swing arm structures 132 are respectively located at both ends of the second rolling structure 131, and one end of each swing arm structure 132 is connected to the base 11, and the other end is connected to the second rolling structure 131, so as to improve the stability of the carbon fiber drawing device 1 during the drawing process.

[0054] As a specific implementation of the first rolling structure 121 and the second rolling structure 131 , the first rolling structure 121 and the second rolling structure 131 are rollers.

[0055] In the present invention, the number of the second rolling mechanism 13 can be one or more, and the specific number can be adjusted according to the number of strands of the raw silk in the raw silk loading box 5. For example, when the number of strands of the raw silk in the raw silk loading box 5 is three (divided into long, medium and short raw silk), as a preferred embodiment of the second rolling mechanism 13, two second rolling mechanisms 13 are provided, and the length and position of the swing arm structure 132 in different second rolling mechanisms 13 can be adjusted according to specific needs.

[0056] As a preferred embodiment of the carbon fiber drawing system, see Figure 1 The carbon fiber drawing system further includes a control mechanism 8, which is connected to the tension monitoring mechanism 21 and the driving mechanism 14 respectively. The tension monitoring mechanism 21 feeds back the detected tension information to the control mechanism 8, and the control mechanism 8 controls the driving mechanism 14 to adjust the angle of the swing arm structure 132 according to the received tension information. The control mechanism 8 can adopt a PLC controller in the prior art, which will not be described in detail here.

[0057] In the utility model, the process of adjusting the swing arm structure 132 through the control mechanism 8, the tension monitoring mechanism 21 and the driving mechanism 14 includes: the tension monitoring mechanism 21 monitors the tension of the raw silk bundle and feeds back the tension information to the control mechanism 8. The control mechanism 8 can set the tension value of the silk bundle in the tension adjustment device 2 during normal operation. When the tension value deviates from the set value, the control mechanism 8 sends a pulse signal to the driving mechanism 14 according to a pre-set adjustment curve. The driving mechanism 14 drives the rotating shaft 141 to rotate, thereby changing the rotation angle of the swing arm structure 132. This cycle is repeated to form a closed-loop adjustment system.

[0058] For example, see Figure 5 , the rotation angle of the swing arm structure 132 is α, the length of the swing arm structure 132 is L6; the set value of the original silk bundle in the tension adjustment device 2 is F1, the measured value is F2, and the current height of the second rolling structure 131 is H, which meets the following conditions:

[0059] 0°<α<90°;

[0060] 0<H<L6;

[0061] H = L6 × sinα;

[0062] When the tension monitoring mechanism 21 measures the tension F2>F1, the control mechanism 8 gives the drive mechanism 14 a signal to rotate the swing arm structure 132 clockwise by 1°. After receiving the signal, the drive mechanism 14 rotates the swing arm structure 132 to lower the second rolling structure 131. The lowering height of the second rolling structure 131 is set to h1.

[0063] h1=H-L6×sin(a-1°);

[0064] When the tension monitoring mechanism 21 measures the tension F2<F1, the control mechanism 8 gives the driving mechanism 14 a signal to rotate the swing arm structure 132 counterclockwise by 1°. After receiving the signal, the driving mechanism 14 rotates the swing arm structure 132 to raise the second rolling structure 131. The rising height of the second rolling structure 131 is set to h2.

[0065] h2=L6×sin(a+1°)-H;

[0066] After the swing arm structure 132 is adjusted, the measured new tension is continuously compared with the set value F1, and the above steps are repeated according to the magnitude relationship after comparison.

[0067] A second aspect of the utility model provides a carbon fiber production line, which includes the carbon fiber drawing system described in the first aspect.

[0068] As a preferred embodiment of the carbon fiber production line, see Figure 1 The carbon fiber production line also includes a vertical five-roller device 7 and an oxidation furnace device 3, which are arranged in sequence from front to back along the running direction of the precursor. The precursor enters the vertical five-roller device 7 from the tension adjustment device 2 for stretching and then runs to the oxidation furnace device 3 for oxidation.

[0069] In the utility model, the oxidation furnace device 3 may include one oxidation furnace or multiple oxidation furnaces, and the number of oxidation furnaces may be adjusted according to the production needs of carbon fiber.

[0070] As a relatively preferred specific embodiment of the carbon fiber production line in the utility model, see Figure 1-Figure 5, including a carbon fiber drawing device 1, a tension adjustment device 2, a control mechanism 8, a vertical five-roller device 7 and an oxidation furnace device 3, the carbon fiber drawing device 1, the tension adjustment device 2, the vertical five-roller device 7 and the oxidation furnace device 3 are arranged in sequence from front to back along the running direction of the precursor, the tension adjustment device 2 is provided with a tension monitoring mechanism 21 for detecting the tension of the tow, and the carbon fiber drawing device 1 is connected to the tension monitoring mechanism 21; the carbon fiber drawing device 1 can adjust multiple strands of carbon fiber precursors with inconsistent lengths according to the tension information detected by the tension monitoring mechanism 21, so that the multiple strands of carbon fiber precursors adjusted by the carbon fiber drawing device 1 have the same length after the carbon fiber drawing device 1, and the carbon fiber drawing device 1 includes a base 11, a driving mechanism 1 4. A first rolling mechanism 12 and a second rolling mechanism 13, wherein the first rolling mechanism 12 and the second rolling mechanism 13 are arranged on the base 11 front and back, and the driving mechanism 14 is connected to the second rolling mechanism 13 so as to be able to drive the second rolling mechanism 13 to rotate around the connection point between the second rolling mechanism 13 and the base 11 so as to adjust the lengths of the plurality of carbon fiber precursors after the carbon fiber drawing device 1 to be consistent, the first rolling mechanism 12 comprises a first rolling structure 121, the second rolling mechanism 13 comprises a second rolling structure 131 and a swing arm structure 132 arranged corresponding to the second rolling structure 131, the first rolling structure 121 is arranged in parallel with the second rolling structure 131, one end of the swing arm structure 132 is connected to the base 11, and the other end is connected to the second rolling structure 131, and the driving mechanism 14 is connected to the swing arm structure 132, with the horizontal plane as the reference plane, the rotation angle of the swing arm structure 132 is 0-90°, the swing arm structure 132 includes a first swing rod 1321 connected to the base 11 and a second swing rod 1322 connected to the second rolling structure 131, the first swing rod 1321 and the second swing rod 1322 are slidably connected, the second swing rod 1322 is provided with two slide grooves 1323 arranged along the length direction of the second swing rod 1322, the first swing rod 1321 is connected with a sliding member suitable for sliding in the slide groove 1323, the sliding member includes a sixth mounting hole 1326, a bolt and a nut provided on the first swing rod 1321, the sixth mounting hole 1326 and the slide groove 1323 are fixed by the bolt and nut to connect the first swing rod The rod 1321 and the second swing rod 1322, the control mechanism 8 are connected with the tension monitoring mechanism 21 and the driving mechanism 14 respectively. The tension frame 4 adopts a three-roller structure, which is composed of 3 metal rollers, 2 metal side plates, and 2 support rods. The two ends of the 3 metal rollers are respectively mounted on the metal side plates and fixed with nuts and bolts. One end of the support rod is mounted on the metal side plate, and the other end is fixed on the second platform. The tension adjustment device 2 is a vertical five-roller device, which is composed of 5 metal rollers, 2 metal side plates, and 2 support rods. The two ends of the 5 metal rollers are respectively mounted on the metal side plates and fixed with nuts and bolts. One end of the support rod is mounted on the metal side plate, and the other end is fixed on the second platform. A steel roller 6 is arranged between the carbon fiber drawing device 1 and the tension adjustment device 2;The oxidation furnace device 3 includes a first oxidation furnace 31, a second oxidation furnace 32 and a third oxidation furnace 33; a steel roller 6 and a vertical five-roller device 7 are arranged between the tension adjustment device 2 and the first oxidation furnace 31. ;

[0071] The above carbon fiber production line is used to industrially produce 60 boxes of 120 strands of 48K carbon fiber precursor. The production process includes the following steps:

[0072] (1) 60 boxes of raw silk loading boxes 5 (each box contains two strands of 48K raw silk) are placed on the operating platform on the first floor. Two strands of 48K raw silk in each box are first drawn through the tension frame 4. The tension frame 4 controls the two strands of raw silk to swing back and forth in the raw silk loading box 5 to unwind, keep the raw silk surface from folding, and smoothly introduce the raw silk into the carbon fiber drawing device 1;

[0073] (2) Two strands of raw yarn enter the carbon fiber drawing device 1, the short raw yarn runs through the first rolling structure 121, and the long raw yarn passes through the first rolling structure 121 and the second rolling structure 131 in sequence. The control mechanism 8 drives the rotation angle of the second swing arm structure 132 through the driving mechanism 14 according to the tension information monitored by the tension monitoring mechanism 21 so that the path lengths of the two strands of raw yarn after adjustment by the carbon fiber drawing device 1 and running to the tension adjustment device 2 are close to the same;

[0074] (3) After the tension of the two strands of raw silk is adjusted by the tension adjusting device 2, they are passed through the steel roller 6 and the vertical five-roller device 7 and run to the inlet of the oxidation furnace device 3;

[0075] (4) The two strands of raw silk are carbonized in the first oxidation furnace 31, the second oxidation furnace 32, and the third oxidation furnace 33 in sequence, and then go through the production process of surface treatment, washing, sizing, drying, and winding to produce 120 strands of 48K carbon fiber.

[0076] It can be seen from the above description that the carbon fiber drawing system provided by the utility model, by arranging a driving mechanism 14 on the carbon fiber drawing device 1 to drive the second rolling mechanism 13 to rotate around the connection point between it and the base, adjusts the position of the second rolling structure 131, increases the running path of the long raw yarn, and adjusts the length of multiple strands of carbon fiber raw yarn after the carbon fiber drawing device 1 to be consistent; through the coordinated action of the driving mechanism 14 and the tension monitoring mechanism 21, it is possible to achieve precise control of the second rolling mechanism 13, further reduce the tension value deviation rate between the multiple strands of raw yarn running to the inlet of the oxidation furnace device 3, avoid fire accidents caused by winding rollers during operation in the oxidation area and harm to the health of operators, and ensure the safe production of carbon fiber.

[0077] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0078] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. In addition, the various different embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A carbon fiber drawing system, characterized in that: The carbon fiber thread drawing system comprises a carbon fiber thread drawing device (1) and a tension adjusting device (2), wherein the carbon fiber thread drawing device (1) and the tension adjusting device (2) are arranged in sequence from front to back along the running direction of the raw yarn, the tension adjusting device (2) is provided with a tension monitoring mechanism (21) for detecting the tension of the yarn bundle, and the carbon fiber thread drawing device (1) is connected to the tension monitoring mechanism (21); the carbon fiber thread drawing device (1) can adjust multiple strands of carbon fiber raw yarns of inconsistent lengths according to the tension information detected by the tension monitoring mechanism (21), so that the multiple strands of carbon fiber raw yarns adjusted by the carbon fiber thread drawing device (1) have the same length after the carbon fiber thread drawing device (1).

2. The carbon fiber drawing system according to claim 1, characterized in that: The carbon fiber threading device (1) comprises a base (11), a driving mechanism (14), a first rolling mechanism (12) and at least one second rolling mechanism (13); the first rolling mechanism (12) and at least one second rolling mechanism (13) are arranged on the base (11) front and back; the driving mechanism (14) is connected to the second rolling mechanism (13) so as to be able to drive the second rolling mechanism (13) to rotate around a connection point between the second rolling mechanism (13) and the base (11) so as to adjust the lengths of the plurality of carbon fiber strands after the carbon fiber threading device (1) to be consistent.

3. The carbon fiber drawing system according to claim 2, characterized in that: The first rolling mechanism (12) comprises a first rolling structure (121), the second rolling mechanism (13) comprises a second rolling structure (131) and a swing arm structure (132) arranged corresponding to the second rolling structure (131), the first rolling structure (121) and the second rolling structure (131) are arranged in parallel, one end of the swing arm structure (132) is connected to the base (11), and the other end is connected to the second rolling structure (131), and the driving mechanism (14) is connected to the swing arm structure (132).

4. The carbon fiber drawing system according to claim 3, characterized in that: With the horizontal plane as the reference plane, the rotation angle of the swing arm structure (132) is 0-90°.

5. The carbon fiber drawing system according to claim 3, characterized in that: The swing arm structure (132) comprises a first swing rod (1321) connected to the base (11) and a second swing rod (1322) connected to the second rolling structure (131), and the first swing rod (1321) and the second swing rod (1322) are slidably connected.

6. The carbon fiber drawing system according to claim 5, characterized in that: A slide groove (1323) is provided on one of the first swing rod (1321) and the second swing rod (1322), and a sliding member suitable for sliding in the slide groove (1323) is connected to the other.

7. The carbon fiber drawing system according to claim 6, characterized in that: The slide groove (1323) is arranged on the second swing rod (1322), and the number of the slide grooves (1323) is two, and the two slide grooves (1323) are arranged along the length direction of the second swing rod (1322).

8. The carbon fiber drawing system according to any one of claims 2 to 4, characterized in that: The carbon fiber drawing system further comprises a control mechanism (8), and the control mechanism (8) is respectively connected to the tension monitoring mechanism (21) and the driving mechanism (14).

9. A carbon fiber production line, characterized in that: The carbon fiber production line comprises the carbon fiber drawing system according to any one of claims 1 to 8.

10. The carbon fiber production line according to claim 9, characterized in that: The carbon fiber production line further comprises a vertical five-roller device (7) and an oxidation furnace device (3), wherein the vertical five-roller device (7) and the oxidation furnace device (3) are arranged in sequence from front to back along the running direction of the raw yarn.

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