Fiber winding method

Abstract

The invention relates to a fiber winding method, and belongs to the technical field of polyacrylonitrile fibers, and the fiber winding method comprises the following steps: after entering a fiber winding machine through a drafting device, the fiber sequentially passes through a first tension wheel, a second tension wheel and a third tension wheel of the fiber winding machine, and then is wound on a winding device of the fiber winding machine for winding; wherein after the fibers enter the filament collecting machine, the path of the fibers to pass through the first tension wheel is defined as a first linear path; after the fiber passes through the first tension wheel, the path of the fiber to pass through the second tension wheel is positioned as a second linear path; after the fiber passes through the second tension wheel, the path of the fiber to pass through the third tension wheel is positioned as a third linear path; wherein straight lines where the first linear path, the second linear path and the third linear path are located intersect to form an acute triangle. The device is mainly used for avoiding large tension fluctuation of tows in the yarn collecting process, so that the accuracy of tension control is improved, and the influence on the fiber quality and the winding effect is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of polyacrylonitrile fibers, and particularly to a method for winding fibers. Background Art

[0002] In the winding process of polyacrylonitrile fibers, the raw filaments are wound into long cylindrical fiber products of a certain length to facilitate subsequent carbon fiber preparation, packaging, storage, sales, etc.

[0003] The winding process of polyacrylonitrile fibers requires that the raw filaments are not damaged during the winding forming process, and the winding forming is good, the end faces and side faces are flat, and the tightness is appropriate, etc. If the winding forming is not good, it will be difficult to unwind during the subsequent unwinding process. Forcible unwinding is likely to generate fuzz and broken filaments, affecting the quality of carbon fibers. At the same time, poor winding forming is not conducive to the packaging and storage of raw filaments.

[0004] The existing methods for winding fibers mainly drive the winding roller to rotate through a motor. The fibers are directly guided to the winding roller of the winding machine through a wire guiding device. The winding roller rotates at a certain speed under the drive of the motor, and the fiber bundle is evenly wound on the roller. During the above process, the tension control system will adjust the filament tension in real time to ensure the tightness and flatness of winding.

[0005] However, the above existing methods for winding fibers have at least the following technical problems: (1) During the wire winding process, the filament tension fluctuates greatly, and it is difficult to accurately control the filament tension, which will affect the quality of the fibers and the winding effect. For example, problems such as uneven tightness and easy breakage of the fibers may occur during the winding process.

[0006] (2) During high-speed wire winding, the stability and reliability of the winding machine decrease, and problems such as vibration are likely to occur, resulting in poor winding quality of the fibers. For example, uneven winding and yarn dropping occur, and at the same time, it will also accelerate the wear of the equipment.

[0007] (3) The degree of automation needs to be improved. At present, more manual interventions are still required, such as manually adjusting parameters (such as the starting speed of the winding machine, etc.), which not only increases the labor cost but also easily causes quality problems due to human negligence.

[0008] (4) Due to the mismatch between the wire winding process and the equipment, there are phenomena such as loose end faces of the wound fiber shafts, yarn dropping, easy fuzzing and breaking of the fibers. Summary of the Invention

[0009] In view of this, the present invention provides a method for winding fibers, and the main purpose is to avoid large fluctuations in filament tension during the wire winding process to improve the accuracy of tension control.

[0010] To achieve the above object, the present invention mainly provides the following technical solutions: On the one hand, an embodiment of the present invention provides a method for winding a fiber. Wherein, the method for winding the fiber includes the following steps: After the fiber passes through the drafting device and enters the wire drawing machine, it first passes through the first tension wheel, the second tension wheel and the third tension wheel of the wire drawing machine in sequence, and then winds around the winding device of the wire drawing machine for winding. Wherein, after entering the wire drawing machine, the fiber path to pass through the first tension wheel is defined as the first straight path; after passing through the first tension wheel, the fiber path to pass through the second tension wheel is positioned as the second straight path; after passing through the second tension wheel, the fiber path to pass through the third tension wheel is positioned as the third straight path. Wherein, the straight lines where the first straight path, the second straight path and the third straight path are located intersect to form an acute triangle.

[0011] Here, by making the fiber paths to pass through the first tension wheel, the second tension wheel and the third tension wheel form an acute triangle, because a triangle has stability and an acute triangle is more stable, the running fiber has better stability when passing through the first tension wheel, the second tension wheel and the third tension wheel and is not easy to fluctuate.

[0012] Preferably, the included angle a1 between the first straight path and the second straight path is 70-80°; the included angle a2 between the second straight path and the third straight path is 25-40°; the included angle a3 between the third straight path and the first straight path is 60-75°.

[0013] Preferably, the winding device includes a cam box and a roller sleeved on the cam box.

[0014] Preferably, during the running of the fiber, by controlling the second tension wheel to swing reciprocally in the direction of approaching and moving away from the roller, so that the difference in tension received by the fiber at any position on the roller is less than 15 cN; preferably, during winding, when the fiber runs towards the middle position of the roller, control the second tension wheel to swing away from the roller; when the fiber runs towards the end position of the roller, control the second tension wheel to swing towards the roller; preferably, the swing distance of the second tension wheel is 10-50 mm; preferably, the second tension wheel is connected to a tension arm; the tension arm is connected to a driving mechanism, and the driving mechanism controls the second tension wheel connected to the tension arm to swing reciprocally; further preferably, the driving mechanism is a cylinder driving mechanism.

[0015] Preferably, the first tension pulley, the second tension pulley, and the third tension pulley apply a tension of H to the fiber; preferably, H is 300-900 cN; preferably, H = M×N / 100; where M represents the number of filaments in one bundle of fibers being wound, N is a constant ranging from 5 to 15, with the unit of cN; and the unit of H is cN.

[0016] Preferably, when the fiber bypassing the third tension pulley runs to the first end position of the roller, the path is the fourth straight path; when the fiber bypassing the third tension pulley runs to the second end position of the roller, the path is the fifth straight path; where the degree of the angle between the fourth straight path and the roller is a4; the degree of the angle between the fifth straight path and the roller is a4; where a4 is 65-85°; and the angle a5 between the fourth straight path and the fifth straight path is 25-45°.

[0017] Preferably, the drafting device includes multiple drafting rollers; where the fiber passes through multiple drafting rollers in sequence; and the last drafting roller passed through is defined as the first drafting roller. Preferably, the starting speed of the winding machine needs to meet the following conditions: V = V1 + K; where, V is the starting speed of the winding machine, with the unit of m / min; K is 5-30 m / min; V1 is the running speed of the fiber when passing through the first drafting roller, with the unit of m / min.

[0018] Preferably, the speed of the first drafting roller is detected by a detection device, and the detection signal is transmitted to the control system of the winding machine. Preferably, the detection device is installed at the bottom of the roller bearing of the first drafting roller. Preferably, the detection device selects a speed detection probe.

[0019] Preferably, the fiber running around the third tension pulley, after passing through the laying groove of the fiber laying device, is wound on the roller of the cam box; preferably, the laying groove has a contact surface for contacting the fiber; where the material of the contact surface is ceramic or stainless steel, and the surface roughness Ra ≤ 0.1.

[0020] Preferably, the laying groove includes a groove bottom and relatively arranged first and second groove walls; the distance between the first and second groove walls is R, with the unit of mm; preferably, R is 0.5-4.5 mm; preferably, R satisfies: R = A / (B×100); where A is the linear density of the fiber, with the unit of g / km, and B is 3.5-5.5 g / (km·mm).

[0021] Preferably, the fiber is a polyacrylonitrile fiber.

[0022] Compared with the prior art, the fiber winding method of the present invention has at least the following beneficial effects: A fiber winding method provided in an embodiment of the present invention forms an acute triangle by making the fiber path to pass through the first tension wheel (i.e., the first straight path), the fiber path to pass through the second tension wheel (i.e., the second straight path), and the fiber path to pass through the third tension wheel. Since the triangle has stability, and the acute triangle is more stable, the running fiber has better stability and is not prone to fluctuation when passing through the first tension wheel, the second tension wheel, and the third tension wheel. Therefore, the winding method of this embodiment can avoid large fluctuations in the tension of the tow and improve the accuracy of the tension control, thereby ensuring the quality of the fiber and the winding effect. In addition, it can also ensure the stability and reliability of the wire collecting machine during high-speed wire collection, and try to avoid vibration problems.

[0023] Furthermore, the fiber winding method provided in the embodiment of the present invention is further designed as follows: the angle a1 between the first straight path and the second straight path is 70-80°; the angle a2 between the second straight path and the third straight path is 25-40°; the angle a3 between the third straight path and the first straight path is 60-75°. Here, the following settings are made: (1) to ensure that the tension wheel layout is compact, to avoid the design of the wire collection machine being too large and the cost being high; (2) to avoid the angle (a1, a2, a3) of the tension wheel being too large. If the angle is too large, the tow is easily pulled during operation; (3) to avoid the angle (a1, a2, a3) of the tension wheel being too small. If the angle of the tension wheel is too small, the tension adjustment range is narrow.

[0024] Furthermore, in the fiber winding method provided in an embodiment of the present invention, during the fiber running process, the second tension wheel is controlled to swing back and forth in the direction of approaching and moving away from the roller, so that the difference in tension applied to the fiber at any position on the roller is small and kept as consistent as possible. This design can further avoid fluctuations in the tension of the fiber bundle and improve the accuracy of tension control, thereby ensuring the quality of the fiber and the winding effect.

[0025] Furthermore, the embodiment of the present invention controls the tension applied to the fibers by the first tension wheel, the second tension wheel, and the third tension wheel according to the number of monofilaments in the wound fiber bundle, and matches the tension with the number of monofilaments in the fiber, thereby avoiding the situation where "the tension is high due to the thin fiber bundle, causing the fibers to be fluffy or broken"; and avoiding the situation where "the tension is low due to the thick fiber bundle, causing slipping, reverse entanglement, or winding too loosely, or yarn falling off during the unwinding process".

[0026] Further, in the fiber winding method provided by the embodiment of the present invention, the starting speed of the wire winder is matched with the speed of the last drafting roller in the drafting device (the starting speed of the wire winder needs to meet the following conditions: V = V1 + K; where V is the starting speed of the wire winder, in m / min; K is a constant, ranging from 5 to 30, in m / min; V1 is the speed of the fiber passing through the first drafting roller, in m / min), so as to avoid the phenomena of fiber breakage and reverse winding during wire winding. Further, in the fiber winding method provided by the embodiment of the present invention, the spacing of the fiber laying groove is matched with the linear density of the fiber, so as to avoid problems such as "too large a spacing, when winding at high speed, the fiber filaments jump out of the fiber laying device or have a large jump width, resulting in large tension fluctuations and poor fiber winding quality (such as uneven winding, yarn dropping, etc.). At the same time, it also avoids problems such as "too small a spacing, which will cause friction between the fiber laying device and the fiber, ultimately resulting in fiber wear and fuzzing as well as equipment wear".

[0027] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and implement it in accordance with the content of the specification, the following takes the preferred embodiments of the present invention and combines with the drawings to describe in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the fiber passing around the first tension pulley, the second tension pulley, and the third tension pulley in the embodiment of the present invention; Figure 2 is a schematic diagram of the fiber passing around the first tension pulley, the second tension pulley, and the third tension pulley in the embodiment of the present invention and then winding around the roller of the wire winder; Figure 3 is a physical diagram of the polyacrylonitrile fiber wound in Experimental Example 1; Figure 4 is a physical diagram of the polyacrylonitrile fiber wound in Comparative Example 2; Figure 5 is a physical diagram of the polyacrylonitrile fiber wound in Comparative Example 3; Figure 6 is a schematic structural diagram of the winding device in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following combines with the drawings and preferred embodiments to describe in detail the specific implementation manners, structures, features, and their effects according to the application of the present invention. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0030] Example 1 This embodiment provides a fiber winding method, wherein: Figure 1 As shown, the fiber winding method includes the following steps: after the fiber 3 passes through the drafting device and enters the wire collecting machine, it first passes through the first tension wheel 11, the second tension wheel 12 and the third tension wheel 13 of the wire collecting machine in sequence, and then is wound on the winding device of the wire collecting machine for winding. Among them, after entering the wire collecting machine, the fiber path to be passed through the first tension wheel 11 is defined as the first straight path 2-1; after passing the first tension wheel 11, the fiber path to be passed through the second tension wheel 12 is positioned as the second straight path 2-2; after passing the second tension wheel 12, the fiber path to be passed through the third tension wheel 13 is positioned as the third straight path 2-3. Among them, the straight lines where the first straight path 2-1, the second straight path 2-2 and the third straight path 2-3 are located intersect to form an acute triangle.

[0031] Here, the present embodiment provides a fiber winding method, by making the fiber path to pass through the first tension wheel 11 (i.e., the first straight path 2-1), the fiber path to pass through the second tension wheel 12 (i.e., the second straight path 2-2), and the fiber path to pass through the third tension wheel 13 form an acute triangle. Since the triangle has stability and the acute triangle is more stable, the fiber has better running stability and is not prone to fluctuation when passing through the first tension wheel, the second tension wheel, and the third tension wheel. Therefore, the winding method of the present embodiment can avoid large fluctuations in the tension of the tow and improve the accuracy of the tension control, thereby ensuring the quality of the fiber and the winding effect. In addition, it can also ensure the stability and reliability of the wire collecting machine during high-speed wire collection, and try to avoid vibration problems.

[0032] It should be noted here that the solution of this embodiment is easy to implement. It is only necessary to adjust the positions of the first tension wheel 11, the second tension wheel 12, and the third tension wheel 13 of the wire collecting machine so that the above conditions are met when the fiber passes through these three tension wheels.

[0033] Preferably, the angle a1 between the first straight path 2-1 and the second straight path 2-2 is 70-80°; the angle a2 between the second straight path 2-2 and the third straight path 2-3 is 25-40°; the angle a3 between the third straight path 2-3 and the first straight path 2-1 is 60-75°. Here, the following settings are made: (1) to ensure that the layout of the tension wheel is compact, and to avoid the design of the wire collection machine being too large and the cost being high; (2) to avoid the angle (a1, a2, a3) of the tension wheel being too large. If the angle is too large, the wire bundle is easily pulled during operation. (3) to avoid the angle of the tension wheel being too small. If the angle (a1, a2, a3) of the tension wheel is too small, the tension adjustment range is narrow.

[0034] Preferably, in this embodiment and the following embodiments, the winding is mainly performed on polyacrylonitrile fibers (polyacrylonitrile-based carbon fiber precursor filaments, simply referred to as precursor filaments).

[0035] Embodiment 2 Preferably, this embodiment provides a method for winding fibers. As Figure 2 shown, the following further design is made in this embodiment: The winding device includes a cam box and a roller 2 sleeved on the cam box.

[0036] Among them, during the running of the fiber 3, by controlling the second tension wheel 12 to swing reciprocally in the directions of approaching and moving away from the roller 2 (such as Figure 2 the directions shown, swinging up and down), so that the difference in the tension received by the fiber at any position when running to (winding onto) the roller 2 is less than 15 cN (that is, try to ensure that the distances of the fiber from the second tension wheel to any position on the roller 2 are about the same, and further ensure that the tensions received by the fiber at any position on the roller 2 are about the same). It should be noted here that winding the fiber onto the roller 2 is not only winding at one position on the roller 2, but winding the fiber as much as possible at the effective positions on the roller 2.

[0037] Specifically, during winding, when the fiber runs towards the middle position of the roller 2, control the second tension wheel 12 to swing in the direction away from the roller 2; when the fiber runs towards the end position of the roller (the roller has two end positions and one middle position, here referring to any end position), control the second tension wheel to swing in the direction approaching the roller 2.

[0038] Preferably, the swing distance 5 of the second tension wheel 12 is 10 - 50 mm; Preferably, the second tension wheel 12 is connected to the tension arm 14; the tension arm 14 is connected to the driving mechanism, and the second tension wheel 12 connected to the tension arm 14 is controlled to swing reciprocally through the driving mechanism; preferably, the driving mechanism is a cylinder driving mechanism. Preferably, the cylinder driving mechanism is connected to the wire winding machine control system.

[0039] Here, for the fiber winding method provided in this embodiment, during the running of the fiber, by controlling the second tension wheel 12 to swing reciprocally in the directions of approaching and moving away from the roller 2 (such as Figure 2 the directions shown, swinging up and down), so that the difference in the tension received by the fiber at any position when running to the roller 2 is relatively small and as consistent as possible. Such a design can further avoid large fluctuations in the tow tension and improve the accuracy of tension control, thereby ensuring the quality of the fiber and the winding effect.

[0040] Embodiment 3 Preferably, this embodiment provides a method for winding fibers. As Figure 1 andFigure 2 As shown, the present embodiment further makes the following designs: The tensions applied to the fiber by the first tension pulley 11, the second tension pulley 12, and the third tension pulley 13 are H; Preferably, H is 300 - 900 cN; preferably, H = M × N / 100; where M represents the number of single filaments in one bundle of wound fiber; N is a constant with a range of 5 - 15, and the unit is cN; the unit of H is cN. It should be noted here that: in this embodiment, the tensions applied to the fiber by the first tension pulley 11, the second tension pulley 12, and the third tension pulley 13 are controlled according to the number of single filaments in one bundle of wound fiber, and the tension is matched with the number of single filaments of the fiber, so as to avoid the situation of "the fiber bundle is relatively thin and the tension is large, resulting in the fiber being fluffed or broken"; and to avoid the situation of "the fiber bundle is relatively thick and the tension is small, resulting in slipping and reverse winding or too loose winding and yarn dropping during the unwinding process".

[0041] Embodiment 4 Preferably, the present embodiment provides a method for winding fiber, as Figure 2 shown, the present embodiment further makes the following designs: When the fiber bypassing the third tension pulley 12 runs to the first end position of the roller, the path is the fourth straight path; when the fiber bypassing the third tension pulley runs to the second end position of the roller, the path is the fifth straight path; where the degree of the angle a4 between the fourth straight path and the roller is 65 - 85°; the degree of the angle a4 between the fifth straight path and the roller is 65 - 85°; the angle a5 between the fourth straight path and the fifth straight path is 25 - 45°. Through the above design, it is ensured that the tensions of the fiber when running to the first end and the second end are basically the same, and the fiber jumping and slipping are reduced when the fiber runs to the end, improving the stability of fiber winding.

[0042] Embodiment 5 Preferably, the present embodiment provides a method for winding fiber, and the present embodiment further makes the following designs: The drafting device includes a plurality of drafting rollers; among them, the fiber passes through the plurality of drafting rollers in sequence; among them, the last drafting roller passed through is defined as the first drafting roller; The starting speed of the wire winding machine needs to meet the following conditions: V = V1 + K; where V is the starting speed of the wire winding machine, and the unit is m / min; K is a constant with a range of 5 - 30, and the unit is m / min; V1 is the running speed of the fiber when passing through the first drafting roller, and the unit is m / min.

[0043] It should be noted here that: (1) When the drawn wire is wound onto the roller on the cam box of the wire take-up machine, if the initial start-up speed of the wire take-up machine is too fast, the fiber will be broken; if it is too slow, the fiber will be wound backwards and the roller will be broken due to entanglement. The setting of V1+K ensures that the fiber will not be broken due to high speed, nor will the fiber be wound backwards due to low speed. (2) In this embodiment, the wire take-up parameters (the start-up speed of the wire take-up machine) are matched with the equipment (the first drafting roller) to avoid phenomena such as fiber breakage and backward winding during wire take-up.

[0044] Preferably, the speed of the first drafting roller is detected by a detection device, and the detection signal is transmitted to the wire take-up machine control system (preferably, the detection device is installed at the bottom of the roller bearing of the first drafting roller to detect the rotation speed of the roller bearing, and the running speed of the roller, that is, the running speed of the fiber, can be converted by the product of the rotation speed and the roller diameter; preferably, the detection device is a speed detection probe. The control system controls the start-up speed of the wire take-up machine to satisfy V=V1+K. Through the above settings, the automation degree of wire take-up can be improved.

[0045] Embodiment 6 Preferably, this embodiment provides a method for winding fibers, as Figure 6 shown. In this embodiment, the following further design is carried out: The running fiber 3 bypassing the third tension wheel, after passing through the wire laying groove of the wire laying device 6, is wound onto the roller 2 on the cam box. It should be noted here that: The wire laying device 6 is installed on the guide rod 7, and the guide rod 7 is arranged parallel to the roller 2; the wire laying device 6 can slide reciprocally on the guide rod 7, and during the sliding process, the running fiber 3 is wound onto the entire effective position of the roller 2 (including the end and the middle position), rather than just being wound in one place.

[0046] Preferably, the wire laying groove has a contact surface for contacting the fiber; wherein, the material of the contact surface is ceramic or stainless steel, and the surface roughness Ra≤0.1. Through such a design, the friction between the wire laying groove and the fiber is reduced, and the generation of fuzz is avoided.

[0047] Preferably, the fiber laying groove includes a groove bottom, and a first groove wall and a second groove wall oppositely arranged; the distance between the first groove wall and the second groove wall is R, with the unit of mm; preferably, R is 0.5 - 4.5 mm. Preferably, R satisfies: R = A / (B × 100); where A is the linear density of the fiber, with the unit of g / km, and B is a constant, ranging from 3.5 - 5.5, with the unit of g / (km·mm). It should be noted here that in this embodiment, the distance of the fiber laying groove is matched with the linear density of the fiber to avoid the phenomenon that "when the distance is too large, during high-speed wire winding, the fiber filaments jump out of the fiber laying device or have a large jumping amplitude, resulting in large tension fluctuations and poor fiber winding quality (such as uneven winding, yarn dropping, etc.). At the same time, it also avoids problems such as "when the distance is too small, friction will occur between the fiber laying device and the fiber, ultimately causing the fiber to wear and become hairy and the equipment to wear".

[0048] In summary, the above embodiments of the present invention provide a method for winding fibers. Through the design of the above embodiments, the wire winding process is matched with the equipment, and the wire winding process is matched with the fiber properties, avoiding the situations of "loose fiber end faces, yarn dropping, fiber abrasion or filament breakage during operation", and finally preparing polyacrylonitrile fibers with flat and compact end faces and no yarn dropping, ensuring stable operation during the fiber winding process.

[0049] The present invention is further illustrated below through specific experimental embodiments: Experimental Example 1 In this Experimental Example 1, polyacrylonitrile fibers (raw filaments) are wound. Among them, after the fibers pass through a drafting device (including multiple drafting rollers, and the last drafting roller is the first drafting roller) and enter the wire winding machine, they first pass through the first tension wheel, the second tension wheel and the third tension wheel of the wire winding machine in sequence, and then pass through the fiber laying device and wind around the roller of the wire winding machine for winding.

[0050] Among them, the actual winding speed of the fiber (i.e., the speed of the fiber passing through the first drafting roller) is 300 m / min, and the starting speed V of the wire winding machine is 320 m / min. Here, the starting speed of the wire winding machine satisfies: V = V1 + K; where V is the starting speed of the wire winding machine, with the unit of m / min; K is a constant, with the unit of m / min, which is 20 m / min here, satisfying the range of 5 - 30 m / min; V1 is the speed of the fiber passing through the first drafting roller, with the unit of m / min.

[0051] Among them, as Figure 1As shown, after entering the wire take-up machine, the fiber path to pass through the first tension pulley 11 is defined as the first straight path 2-1; the fiber path to pass through the second tension pulley 12 after passing through the first tension pulley 11 is positioned as the second straight path 2-2; the fiber path to pass through the third tension pulley 13 after passing through the second tension pulley 12 is positioned as the third straight path 2-3. Among them, the straight lines where the first straight path 2-1, the second straight path 2-2, and the third straight path 2-3 are located intersect to form an acute triangle. Among them, as Figure 1 and 2 shown, during the fiber running process, the tension arm 14 is controlled by a cylinder, and the tension arm 14 controls the second tension pulley 12 to swing up and down reciprocally to control the tension of the fiber running to the two end positions and the middle position of the roller to be basically the same. The swing distance of the second tension pulley 12 is 30 mm.

[0052] The included angle a1 between the first straight path 2-1 and the second straight path 2-2 is 70-80°; the included angle a2 between the second straight path 2-2 and the third straight path 2-3 is 25-40°; the included angle a3 between the third straight path 2-3 and the first straight path 2-1 is 60-75°. It should be noted here that during the swing of the second tension pulley, the angles of a1, a2, and a3 will change, but they are all within the above ranges.

[0053] Among them, the tension applied by the first tension pulley 11, the second tension pulley 12, and the third tension pulley 13 to the fiber is H; H is 350 cN; and, H = M×N / 100; where, M represents the number of single filaments in 1 bundle of wound fibers; M is 3000; N is a constant, with the unit of cN, which is 11.7 cN in this embodiment, and satisfies the range of 5-15 cN.

[0054] Among them, as Figure 2 shown, the path of the fiber after bypassing the third tension pulley 12 when running to the first end position of the roller is the fourth straight path; the path of the fiber after bypassing the third tension pulley when running to the second end position of the roller is the fifth straight path; among them, the included angle a4 between the fourth straight path and the roller is 75°; the included angle a4 between the fifth straight path and the roller is 75°; the included angle a5 between the fourth straight path and the fifth straight path is 30°.

[0055] Among them, the material of the contact surface of the fiber placement device for contacting the fiber is ceramic, the surface roughness Ra is 0.1, the spacing R of the fiber placement device is 1 mm, the running fiber bundle is 3k, and the linear density of the fiber is 350 g / km. R satisfies: R = A / (B×100); where, A is the linear density of the fiber, with the unit of g / km, B is a constant, with the unit of g / (km·mm), specifically 3.5 g / (km·mm), and satisfies the range of 3.5-5.5 g / (km·mm).

[0056] For the physical diagram of the polyacrylonitrile fiber wound in this experimental example, please refer to Figure 3 as described, from Figure 3 it can be seen that: the end face of the polyacrylonitrile fiber wound in this experimental example is flat and compact, without yarn dropping.

[0057] Experimental Example 2 In this Experimental Example 2, the polyacrylonitrile fiber (raw fiber) is wound. Among them, after the fiber passes through the drafting device (including multiple drafting rollers, and the last drafting roller is the first drafting roller) and enters the wire winding machine, it first passes through the first tension wheel, the second tension wheel and the third tension wheel of the wire winding machine in sequence, and then passes through the wire spreading device and winds around the roller of the wire winding machine for winding.

[0058] Among them, the speed of the fiber passing through the first drafting roller is V1 = 260 m / min, and the starting speed V of the wire winding machine is 270 m / min; here, the starting speed of the wire winding machine satisfies: V = V1 + K; where V is the starting speed of the wire winding machine, with the unit of m / min; K is a constant, with the unit of m / min, which is 10 m / min here, and satisfies the range of 5 - 30 m / min; V1 is the speed of the fiber passing through the first drafting roller, with the unit of m / min.

[0059] Among them, as Figure 1 shown, after entering the wire winding machine, the fiber path to pass through the first tension wheel 11 is defined as the first straight path 2 - 1; the fiber path to pass through the second tension wheel 12 after passing through the first tension wheel 11 is positioned as the second straight path 2 - 2; the fiber path to pass through the third tension wheel 13 after passing through the second tension wheel 12 is positioned as the third straight path 2 - 3. Among them, the straight lines where the first straight path 2 - 1, the second straight path 2 - 2, and the third straight path 2 - 3 are located intersect to form an acute triangle. Among them, as Figure 1 and 2 shown, during the fiber running process, the tension arm 14 is controlled by the air cylinder, and the tension arm 14 controls the second tension wheel 12 to swing up and down reciprocally to control the tension of the fiber running to the two end positions and the middle position of the roller to be basically the same. The swing distance of the second tension wheel 12 is 20 mm.

[0060] The included angle a1 between the first straight path 2 - 1 and the second straight path 2 - 2 is 70 - 80°; the included angle a2 between the second straight path 2 - 2 and the third straight path 2 - 3 is 25 - 40°; the included angle a3 between the third straight path 2 - 3 and the first straight path 2 - 1 is 60 - 75°. It should be noted here that during the swing of the second tension wheel, the angles of a1, a2, and a3 will change, but all are within the above ranges.

[0061] Among them, the tensions applied by the first tension pulley 11, the second tension pulley 12, and the third tension pulley 13 to the fiber are H; H is 900 cN; and, H = M × N / 100; where, M represents the number of monofilaments in one bundle of wound fiber; M is 12,000; N is a constant, with the unit of cN, which is 7.5 cN here, satisfying the range of 5 - 15 cN.

[0062] Among them, as Figure 2 shown, the path of the fiber after bypassing the third tension pulley 12 when it runs to the first end position of the roller is the fourth straight path; the path of the fiber after bypassing the third tension pulley when it runs to the second end position of the roller is the fifth straight path; where, the angle a4 between the fourth straight path and the roller is 75°; the angle a4 between the fifth straight path and the roller is 75°; the angle a5 between the fourth straight path and the fifth straight path is 30°.

[0063] Among them, the material of the contact surface on the fiber laying device for contacting the fiber is ceramic, the surface roughness Ra is 0.1, the spacing R of the fiber laying device is 3 mm, the running fiber bundle is 12k, and the linear density of the fiber is 1400 g / km. R satisfies: R = A / (B × 100); where, A is the linear density of the fiber, with the unit of g / km, B is a constant, with the unit of g / (km·mm), specifically 4.6 g / (km·mm), satisfying the range of 3.5 - 5.5 g / (km·mm).

[0064] The end face of the polyacrylonitrile fiber wound in this experimental example is flat and compact, without yarn dropping.

[0065] Experimental Example 3 This Experimental Example 3 winds the polyacrylonitrile fiber (raw fiber). Among them, after the fiber passes through the drafting device (including multiple drafting rollers, and the last drafting roller is the first drafting roller) and enters the winding machine, it first passes through the first tension pulley, the second tension pulley, and the third tension pulley of the winding machine in sequence, and then passes through the fiber laying device and winds around the roller of the winding machine for winding.

[0066] Among them, the speed of the fiber passing through the first drafting roller is V1 which is 320 m / min, and the starting speed V of the winding machine is 350 m / min; here, the starting speed of the winding machine satisfies: V = V1 + K; where, V is the starting speed of the winding machine, with the unit of m / min; K is a constant, with the unit of m / min, specifically 30 m / min, satisfying the range of 5 - 30 m / min; V1 is the speed of the fiber passing through the first drafting roller, with the unit of m / min.

[0067] Among them, as Figure 1As shown, after entering the wire take-up machine, the fiber path passing through the first tension pulley 11 is defined as the first straight path 2-1; the fiber path passing through the first tension pulley 11 and then passing through the second tension pulley 12 is positioned as the second straight path 2-2; the fiber path passing through the second tension pulley 12 and then passing through the third tension pulley 13 is positioned as the third straight path 2-3. Among them, the straight lines where the first straight path 2-1, the second straight path 2-2, and the third straight path 2-3 are located intersect to form an acute triangle.

[0068] Among them, as Figure 1 and 2 shown, during the running of the fiber, the tension arm 14 is controlled by a cylinder, and the tension arm 14 controls the second tension pulley 12 to swing up and down reciprocally to control the tension of the fiber running to both ends and the middle position of the roller to be consistent. The swing distance of the second tension pulley 12 is 40mm.

[0069] The included angle a1 between the first straight path 2-1 and the second straight path 2-2 is 70-80°; the included angle a2 between the second straight path 2-2 and the third straight path 2-3 is 25-40°; the included angle a3 between the third straight path 2-3 and the first straight path 2-1 is 60-75°. It should be noted here that during the swing of the second tension pulley, the angles of a1, a2, and a3 will change, but they are all within the above ranges.

[0070] Among them, the tension applied to the fiber by the first tension pulley 11, the second tension pulley 12, and the third tension pulley 13 is H; H is 600cN; and, H = M×N / 100; where, M represents the number of single filaments in 1 bundle of wound fibers; M is 6000; N is a constant, in the unit of cN, specifically 10cN, and the range is 5-15cN.

[0071] Among them, as Figure 2 shown, the path of the fiber after passing around the third tension pulley 12 when running to the first end position of the roller is the fourth straight path; the path of the fiber after passing around the third tension pulley when running to the second end position of the roller is the fifth straight path; among them, the included angle a4 between the fourth straight path and the roller is 70°; the included angle a4 between the fifth straight path and the roller is 70°; the included angle a5 between the fourth straight path and the fifth straight path is 40° Among them, the material of the contact surface of the fiber laying device for contacting the fiber is ceramic, the surface roughness Ra is 0.1, the spacing R of the fiber laying device is 2mm, the running fiber bundle is 6k, and the linear density of the fiber is 800g / km. R satisfies: R = A / (B×100); where, A is the linear density of the fiber, in the unit of g / km, B is a constant, in the unit of g / (km·mm), specifically 4g / (km·mm), and satisfies the range of 3.5-5.5g / (km·mm).

[0072] In the present experimental example, the end face of the wound polyacrylonitrile fiber is flat and compact, without yarn dropping.

[0073] Comparative Example 1 In Comparative Example 1, polyacrylonitrile fiber (raw silk) was wound. Among them, after the fiber passed through a drafting device (including multiple drafting rollers, and the last drafting roller was the first drafting roller) and entered the winding machine, it first passed through the first tension wheel, the second tension wheel and the third tension wheel of the winding machine in sequence, and then passed through the filament spreading device and wound around the roller of the winding machine for winding.

[0074] Compared with Experimental Example 1, in Comparative Example 1: The fiber path waiting to pass through the first tension wheel is defined as the first straight path; the fiber path waiting to pass through the second tension wheel after passing through the first tension wheel is positioned as the second straight path; the fiber path waiting to pass through the third tension wheel after passing through the second tension wheel is positioned as the third straight path. Among them, the straight lines where the first straight path, the second straight path and the third straight path are located intersect to form an obtuse triangle.

[0075] Among them, the included angle a1 between the first straight path and the second straight path is 100° - 120°; the included angle a2 between the second straight path and the third straight path is 30° - 40°; the included angle a3 between the third straight path and the first straight path is 30° - 40°.

[0076] Among them, the swing distance of the second tension wheel is 5 mm; Others are the same as Experimental Example 1.

[0077] Among them, the end face of the polyacrylonitrile fiber wound in Comparative Example 1 has serious fuzz, and the wire is easily fuzzed and broken during operation, and the wire breakage is frequent.

[0078] Comparative Example 2 In Comparative Example 2, polyacrylonitrile fiber (raw silk) was wound. Among them, after the fiber passed through a drafting device (including multiple drafting rollers, and the last drafting roller was the first drafting roller) and entered the winding machine, it first passed through the first tension wheel, the second tension wheel and the third tension wheel of the winding machine in sequence, and then passed through the filament spreading device and wound around the roller of the winding machine for winding.

[0079] Compared with Experimental Example 1, in Comparative Example 2, the distance R between the filament spreading devices does not satisfy: R = A / (B × 100); where A is the linear density of the fiber, with the unit of g / km, and B is a constant, with the unit of g / (km·mm), and the range is 3.5 - 5.5 g / km. Others are the same as Experimental Example 1.

[0080] Here, Comparative Example 2 is actually also an example of implementing the present invention, but it is not a preferred example.

[0081] For the physical diagram of the wound polyacrylonitrile fiber in Comparative Example 2, see Figure 4 as described, from Figure 4 it can be seen that there is yarn dropping at the end face of the wound polyacrylonitrile fiber, and it is easy to entangle and break the wire during the carbonization unwinding process, affecting the operation.

[0082] Comparative Example 3 In Comparative Example 3, the polyacrylonitrile fiber (raw fiber) is wound. Among them, after the fiber passes through the drafting device (including multiple drafting rollers, and the last drafting roller is the first drafting roller) and enters the winding machine, it first passes through the first tension wheel, the second tension wheel and the third tension wheel of the winding machine in sequence, and then passes through the wire laying device and winds around the roller of the winding machine for winding.

[0083] Compared with Experimental Example 1, in Comparative Example 3, the tension H applied by the first tension wheel 11, the second tension wheel 12, and the third tension wheel 13 to the fiber is 50 cN, and it does not satisfy H = M × N / 100; where M represents the number of monofilaments in one bundle of wound fibers; N is a constant, with the unit of cN, and the range is 5 - 15 cN; the unit of H is cN.

[0084] For the physical diagram of the wound polyacrylonitrile fiber in Comparative Example 3, see Figure 5 as described, from Figure 5 it can be seen that the end face of the wound polyacrylonitrile fiber is loose and the yarn dropping is serious. However, the overall winding effect is better than that of Comparative Example 1.

[0085] Comparative Example 4 In Comparative Example 4, the polyacrylonitrile fiber (raw fiber) is wound. Among them, after the fiber passes through the drafting device (including multiple drafting rollers, and the last drafting roller is the first drafting roller) and enters the winding machine, it first passes through the first tension wheel, the second tension wheel and the third tension wheel of the winding machine in sequence, and then passes through the wire laying device and winds around the roller of the winding machine for winding.

[0086] Compared with Experimental Example 1, in Comparative Example 4, the starting speed of the winding machine is 350 m / min, which does not satisfy V = V1 + K, and the rest is the same as in Example 1.

[0087] Here, due to the too fast starting speed of the winding machine in Comparative Example 4, after the polyacrylonitrile fiber is wound onto the winding machine, a wire breaking phenomenon occurs.

[0088] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for winding a fiber, characterized in that, The winding method of the fiber includes the following steps: After the fiber passes through the drafting device and enters the wire drawing machine, it first passes through the first tension wheel, the second tension wheel and the third tension wheel of the wire drawing machine in sequence, and then winds around the winding device of the wire drawing machine for winding. Among them, after entering the wire drawing machine, the fiber path to pass through the first tension wheel is defined as the first straight path; after passing through the first tension wheel, the fiber path to pass through the second tension wheel is positioned as the second straight path; after passing through the second tension wheel, the fiber path to pass through the third tension wheel is positioned as the third straight path. Among them, the straight lines where the first straight path, the second straight path and the third straight path are located intersect to form an acute triangle.

2. The winding method of the fiber according to claim 1, characterized in that, The included angle a1 between the first straight path and the second straight path is 70-80°; the included angle a2 between the second straight path and the third straight path is 25-40°; the included angle a3 between the third straight path and the first straight path is 60-75°.

3. The winding method of the fiber according to claim 1, characterized in that, The winding device includes a cam box and a roller sleeved on the cam box.

4. The method for winding the fiber according to claim 3, characterized in that, During the running of the fiber, by controlling the second tension wheel to swing reciprocally in the direction of approaching and departing from the roller, so that the difference in tension of the fiber at any position on the roller is less than 15 cN.

5. The winding method of the fiber according to claim 4, characterized in that, During winding, when the fiber runs towards the middle position of the roller, control the second tension wheel to swing away from the roller; when the fiber runs towards the end position of the roller, control the second tension wheel to swing towards the roller.

6. The winding method of the fiber according to claim 4, wherein, The swing distance of the second tension wheel is 10-50 mm.

7. The winding method of the fiber according to claim 4, wherein The second tension wheel is connected to the tension arm; the tension arm is connected to the driving mechanism, and the driving mechanism is used to control the second tension wheel connected to the tension arm to swing reciprocally.

8. The winding method of the fiber according to claim 1, characterized in that, The tension applied by the first tension wheel, the second tension wheel and the third tension wheel to the fiber is H; where H is 300-900 cN; or H = M×N / 100; where M represents the number of single filaments in one bundle of wound fiber, N is a constant in the range of 5-15, and the unit of N is cN; the unit of H is cN.

9. The winding method of the fiber according to claim 3, characterized in that, The path of the fiber after passing around the third tension wheel to the first end position of the roller is the fourth straight path; the path of the fiber after passing around the third tension wheel to the second end position of the roller is the fifth straight path; where The degree of the included angle between the fourth straight path and the roller is a4; the degree of the included angle between the fifth straight path and the roller is a4; where a4 is 65-85°. The included angle a5 between the fourth straight path and the fifth straight path is 25-45°.

10. The winding method of the fiber according to claim 1, characterized in that, The drafting device includes a plurality of drafting rollers; among them, the fiber passes through a plurality of drafting rollers in sequence; among them, the last drafting roller passed through is defined as the first drafting roller. The starting speed of the wire drawing machine needs to meet the following conditions: V = V1 + K; where V is the starting speed of the wire drawing machine, and the unit is m / min; K is 5-30 m / min; V1 is the running speed of the fiber when passing through the first drafting roller, and the unit is m / min.

11. The winding method of the fiber according to claim 10, characterized in that, The speed of the first drafting roller is detected by a detection device, and the detection signal is transmitted to the wire winding machine control system.

12. The winding method of the fiber according to claim 11, characterized in that, The detection device is installed at the bottom of the roller bearing of the first drafting roller.

13. The winding method of the fiber according to claim 11, characterized in that, The detection device selects a speed detection probe.

14. The winding method of the fiber according to claim 3, characterized in that, The running fiber bypassing the third tension pulley is wound on the roller of the cam box after passing through the wire laying groove of the wire laying device.

15. The winding method of the fiber according to claim 14, characterized in that, The wire laying groove has a contact surface for contacting the fiber; wherein, the material of the contact surface is ceramic or stainless steel, and the roughness Ra ≤ 0.

1.

16. The winding method of the fiber according to claim 14, characterized in that, The wire laying groove includes a groove bottom and relatively arranged first and second groove walls; the distance between the first and second groove walls is R, with the unit of mm.

17. The winding method of the fiber according to claim 16, characterized in that, R is 0.5 - 4.5 mm.

18. The method for winding the fiber according to claim 16, characterized in that, R satisfies: R = A / (B × 100); wherein, A is the linear density of the fiber, with the unit of g / km; B is 3.5 - 5.5 g / (km·mm).

19. The winding method of the fiber according to any one of claims 1-18, characterized in that, The fiber is polyacrylonitrile fiber.

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