A method of winding a fibre

Abstract

The present application relates to a kind of winding methods of fiber, belong to the technical field of polyacrylonitrile fiber, wherein the winding method of fiber includes the following steps: fiber passes through drawing device and enters silk collector, first pass through the first tension wheel of silk collector, second tension wheel and third tension wheel in turn, then wind to the winding device of silk collector, and carry out winding;Wherein, after entering silk collector, the fiber path that is passed through the first tension wheel is defined as first straight line path;After passing through the first tension wheel, the fiber path that is passed through second tension wheel is positioned as second straight line path;After passing through the second tension wheel, the fiber path that is passed through third tension wheel is positioned as third straight line path;Wherein, the straight line of first straight line path, second straight line path, third straight line path intersects, forms acute triangle.This application is mainly used in silk collecting process, avoids that the tension fluctuation of tows is larger, to improve the accuracy of tension control, avoid affecting the quality and winding effect of fiber.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polyacrylonitrile fibers, in particular to a fiber winding method. BACKGROUND

[0002] The winding process of polyacrylonitrile fibers is to wind the original filaments into long cylindrical fiber shaft products of a certain length, so as to facilitate subsequent carbon fiber preparation or packaging, storage, sales, etc.

[0003] The winding process of polyacrylonitrile fibers requires that the original filaments cannot be damaged during winding and forming, and the winding and forming is good, the end surface and side surface are flat, and the tightness is moderate, etc. If the winding and forming is not good, it will be difficult to unwind in the subsequent unwinding process, and forcibly unwinding will easily produce hair and broken filaments, affecting the quality of carbon fibers. At the same time, poor winding and forming is not conducive to the packaging and storage of the original filaments.

[0004] The existing fiber winding method mainly drives the winding roller to rotate by a motor, the fiber is directly guided to the winding roller of the fiber collector by a guide device, and the winding roller rotates at a certain speed under the driving of the motor to uniformly wind the fiber bundle on the roller. In the above process, the tension control system adjusts the tension of the fiber bundle in real time to ensure the tightness and flatness of the winding.

[0005] However, the existing fiber winding method at least has the following technical problems:

[0006] (1) In the fiber collecting process, the tension of the fiber bundle fluctuates greatly, and it is difficult to accurately control the tension of the fiber bundle, thereby affecting the quality of the fiber and the winding effect, for example, the fiber may be loose and easy to break during winding.

[0007] (2) When the fiber is collected at high speed, the stability and reliability of the fiber collector decrease, and problems such as vibration easily occur, which leads to poor winding quality of the fiber, for example, the winding is irregular, the yarn falls off, etc., and also accelerates the wear of the equipment.

[0008] (3) The degree of automation needs to be improved, and at present, more manual intervention is still needed, such as manual adjustment of parameters (such as the starting speed of the fiber collector), which not only increases the labor cost, but also easily causes quality problems due to human negligence.

[0009] (4) Due to the mismatch between the fiber collecting process and the equipment, the end surface of the wound fiber shaft is loose, the yarn falls off, the fiber is easy to be abraded and broken. SUMMARY

[0010] Therefore, the present application provides a fiber winding method, the main purpose of which is to avoid large fluctuations in the tension of the fiber bundle during the fiber collecting process to improve the accuracy of tension control.

[0011] To achieve the above object, the present application mainly provides the following technical solutions:

[0012] In one aspect, the embodiment of the present application provides a fiber winding method, wherein the fiber winding method comprises the following steps:

[0013] After the fiber passes through the drafting device and enters the yarn collector, the fiber sequentially passes through the first tension wheel, the second tension wheel and the third tension wheel of the yarn collector, and then is wound on the winding device of the yarn collector for winding;

[0014] The fiber path after passing through the first tension wheel is defined as a first straight line path; the fiber path after passing through the first tension wheel is defined as a second straight line path; and the fiber path after passing through the second tension wheel is defined as a third straight line path.

[0015] The straight lines where the first straight line path, the second straight line path and the third straight line path are located intersect to form an acute triangle.

[0016] Here, the fiber path after passing through the first tension wheel, the fiber path after passing through the second tension wheel and the fiber path after passing through the third tension wheel form an acute triangle, and since the triangle has stability and the acute triangle is more stable, the running fiber is stable and not easy to fluctuate when passing through the first tension wheel, the second tension wheel and the third tension wheel.

[0017] Preferably, the included angle a1 between the first straight line path and the second straight line path is 70-80°; the included angle a2 between the second straight line path and the third straight line path is 25-40°; and the included angle a3 between the third straight line path and the first straight line path is 60-75°.

[0018] Preferably, the winding device comprises a cam box and a roller sleeve fitted on the cam box.

[0019] Preferably, during the running of the fiber, the second tension wheel is controlled to reciprocate towards the direction of approaching or moving away from the roller sleeve so that the difference in tension on the fiber at any position on the roller sleeve is less than 15 cN; preferably, during winding, when the fiber runs towards the middle position of the roller sleeve, the second tension wheel is controlled to swing away from the roller sleeve; when the fiber runs towards the end position of the roller sleeve, the second tension wheel is controlled to swing towards the roller sleeve; preferably, the swing distance of the second tension wheel is 10-50 mm; preferably, the second tension wheel is connected with a tension arm, the tension arm is connected with a driving mechanism, and the second tension wheel connected with the tension arm is controlled to reciprocate by the driving mechanism; further preferably, the driving mechanism is a pneumatic cylinder driving mechanism.

[0020] Preferably, the first tension wheel, the second tension wheel, and the third tension wheel apply a tension of H to the fiber; preferably, H is 300-900 cN; preferably, H=MxN / 100; wherein, M represents the number of filaments in the fiber bundle; N is a constant, ranging from 5-15, with the unit of cN; the unit of H is cN.

[0021] Preferably, the path of the fiber running to the first end position of the roller after bypassing the third tension wheel is a fourth straight line path; the path of the fiber running to the second end position of the roller after bypassing the third tension wheel is a fifth straight line path; wherein, the angle between the fourth straight line path and the roller is a4; the angle between the fifth straight line path and the roller is a4; wherein, a4 is 65-85°; the angle a5 between the fourth straight line path and the fifth straight line path is 25-45°.

[0022] Preferably, the drafting device comprises a plurality of drafting rollers; wherein, the fiber passes through the plurality of drafting rollers in sequence; wherein, the last drafting roller passed through is defined as the first drafting roller;

[0023] Preferably, the start-up speed of the fiber collector needs to satisfy the following condition:

[0024] V=V1+K; wherein,

[0025] V is the start-up speed of the fiber collector, with the unit of m / min;

[0026] K is 5-30 m / min;

[0027] V1 is the running speed of the fiber when passing through the first drafting roller, with the unit of m / min.

[0028] Preferably, the speed of the first drafting roller is detected by a detection device, and the detection signal is transmitted to the fiber collector control system;

[0029] Preferably, the detection device is installed at the bottom of the roller bearing of the first drafting roller;

[0030] Preferably, the detection device uses a speed detection probe.

[0031] Preferably, the running fiber bypassing the third tension wheel is wound on the roller of the cam box after passing through the laying groove of the fiber layer; preferably, the 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 is ≤0.1.

[0032] Preferably, the fiber laying groove comprises a groove bottom and oppositely arranged first and second groove walls; the distance between the first and second groove walls is R, in mm; preferably, R is 0.5-4.5 mm; preferably, R satisfies: R=A / (B*100); wherein A is the linear density of the fiber, in g / km, and B is 3.5-5.5 g / (km*mm).

[0033] Preferably, the fiber is polyacrylonitrile fiber.

[0034] Compared with the prior art, the fiber winding method of the present application has at least the following beneficial effects:

[0035] The fiber winding method provided by the present application forms an acute triangle with the fiber path to be passed through the first tension wheel (i.e., the first straight path), the fiber path to be passed through the second tension wheel (i.e., the second straight path), and the fiber path to be passed through the third tension wheel. Since a triangle is stable and an acute triangle is more stable, the fiber is stable when running through the first, second, and third tension wheels, and is not prone to fluctuation. Therefore, the winding method of the present application can avoid large fluctuations in the tow tension, improve the accuracy of tension control, and thus ensure the quality and winding effect of the fiber. In addition, the stability and reliability of the fiber winder can be ensured during high-speed fiber winding, and vibration problems can be avoided as much as possible.

[0036] Further, the fiber winding method provided by the present application is further designed as follows: the included angle a1 between the first and second straight paths is 70-80°; the included angle a2 between the second and third straight paths is 25-40°; and the included angle a3 between the third and first straight paths is 60-75°. By such arrangement, (1) the layout of the tension wheels is compact, avoiding an excessively large fiber winder design and high cost; (2) the angles (a1, a2, a3) of the tension wheels are not excessively large, and if the angles are excessively large, the tow is prone to be pulled during running; and (3) the angles (a1, a2, a3) of the tension wheels are not excessively small, and if the angles of the tension wheels are excessively small, the tension adjustment range is narrow.

[0037] Further, in the fiber winding method provided by the present application, the second tension wheel reciprocally swings towards and away from the roller during fiber running, so that the difference in the tension on the fiber at any position on the roller is small, and consistency is ensured as much as possible. Such design can further avoid fluctuations in the tow tension, improve the accuracy of tension control, and thus ensure the quality and winding effect of the fiber.

[0038] Further, the embodiment of the present application controls the tension applied to the fiber by the first tension wheel, the second tension wheel and the third tension wheel according to the number of filaments in the fiber bundle, matches the tension with the number of filaments of the fiber, avoids the situation that the tension is large due to the thin fiber bundle, and the filaments are pulled out or broken; and avoids the situation that the tension is small due to the thick fiber bundle, and the fiber is slippage, winding is loose, and the fiber is dropped during unwinding.

[0039] Further, the fiber winding method provided by the embodiment of the present application matches the starting speed of the fiber collector with the speed of the last drafting roller in the drafting device (the starting speed of the fiber collector needs to satisfy the following condition: V=V1+K; wherein V is the starting speed of the fiber collector, and the unit is m / min; K is a constant, and the range is 5-30, and the unit is m / min; V1 is the speed of the fiber passing through the first drafting roller, and the unit is m / min), so that the fiber is not broken and wound in reverse during winding,

[0040] Further, the fiber winding method provided by the embodiment of the present application matches the spacing of the fiber laying groove with the linear density of the fiber, avoids the situation that the spacing is too large, the fiber is jumped out of the fiber laying device or the amplitude of the fiber is large during high-speed winding, and the winding quality of the fiber is poor (such as irregular winding, fiber dropping, etc.) due to the large tension fluctuation. At the same time, the situation that the spacing is too small, the friction between the fiber laying device and the fiber is generated, and the fiber is finally abraded and damaged, and the equipment is finally abraded is avoided.

[0041] The above description is only a summary of the technical scheme of the present application. In order to more clearly understand the technical means of the present application, and to implement the content of the description, the following will be described in detail with the preferred embodiments of the present application and with the help of the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 FIG. 1 is a schematic diagram of the fiber winding through the first tension wheel, the second tension wheel and the third tension wheel in the embodiment of the present application;

[0043] Figure 2 FIG. 1 is a schematic diagram of the fiber winding through the first tension wheel, the second tension wheel and the third tension wheel in the embodiment of the present application;

[0044] Figure 3 FIG. 1 is a schematic diagram of the fiber winding through the first tension wheel, the second tension wheel and the third tension wheel in the embodiment of the present application;

[0045] Figure 4 FIG. 1 is a schematic diagram of the fiber winding through the first tension wheel, the second tension wheel and the third tension wheel in the embodiment of the present application;

[0046] Figure 5 FIG. 1 is a schematic diagram of the fiber winding through the first tension wheel, the second tension wheel and the third tension wheel in the embodiment of the present application;

[0047] Figure 6 Schematic diagram of the structure of the winding device in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] To further illustrate the technical means and effects employed by the present invention to achieve its intended objectives, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention is provided in conjunction with the accompanying drawings and preferred embodiments. In the following description, different references to "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0049] Example 1

[0050] 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-receiving machine, it first passes through the wire-receiving machine's first tension pulley 11, second tension pulley 12, and third tension pulley 13 in sequence, and then is wound onto the wire-receiving machine's winding device for winding. After entering the wire-receiving machine, the fiber path before passing through the first tension pulley 11 is defined as a first straight path 2-1; after passing through the first tension pulley 11, the fiber path before passing through the second tension pulley 12 is defined as a second straight path 2-2; and after passing through the second tension pulley 12, the fiber path before passing through the third tension pulley 13 is defined as a third straight path 2-3. The straight lines of the first straight path 2-1, the second straight path 2-2, and the third straight path 2-3 intersect, forming an acute triangle.

[0051] Here, this embodiment provides a fiber winding method, in which the fiber path to be passed through the first tension wheel 11 (i.e., the first straight path 2-1), the fiber path to be passed through the second tension wheel 12 (i.e., the second straight path 2-2), and the fiber path to be passed through the third tension wheel 13 form an acute-angle triangle. Since triangles are stable, and acute-angle triangles are more stable, the fiber has better running stability and is less likely to fluctuate 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, improve the accuracy of tension control, and thus ensure the quality of the fiber and the winding effect. In addition, it can also ensure the stability and reliability of the winder during high-speed winding, and minimize vibration problems.

[0052] It should be noted 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.

[0053] 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°; and the angle a3 between the third straight path 2-3 and the first straight path 2-1 is 60-75°. By setting the above configurations: (1) the layout of the tension wheel is kept compact, thus avoiding an overly large design of the wire collection machine and high costs; (2) the angles (a1, a2, a3) of the tension wheel are prevented from being too large. If the angles are too large, the yarn bundle is easily pulled during operation. (3) the angles of the tension wheel are prevented from being too small. If the angles (a1, a2, a3) of the tension wheel are too small, the tension adjustment range is narrow.

[0054] Preferably, this embodiment and the following embodiments are mainly aimed at winding polyacrylonitrile fibers (polyacrylonitrile-based carbon fiber precursor, referred to as precursor for short).

[0055] Example 2

[0056] Preferably, this embodiment provides a fiber winding method, such as Figure 2 As shown, this embodiment is further designed as follows: the winding device includes a cam box and a roller 2 mounted on the cam box.

[0057] During the running of the fiber 3, the second tension wheel 12 is controlled to swing back and forth in the direction of approaching and moving away from the roller 2 (e.g. Figure 2 The second tension pulley is rotated up and down in the direction shown in the figure) so that the difference in tension on the fiber at any position on roller 2 is less than 15 cN (that is, the distance from the second tension pulley to any position on roller 2 is kept as similar as possible, thereby ensuring that the tension on the fiber at any position on roller 2 is similar). It should be noted that when winding the fiber onto roller 2, the fiber is not wound at only one position on roller 2, but rather is wound at all effective positions on roller 2 as much as possible.

[0058] Specifically, during winding, when the fiber runs toward the middle position of the roller 2, the second tension wheel 12 is controlled to swing away from the roller 2; when the fiber runs toward the end position of the roller (the roller has two end positions and one middle position, which refers to any end position here), the second tension wheel is controlled to swing toward the direction close to the roller 2.

[0059] Preferably, the swing distance 5 of the second tension wheel 12 is 10-50 mm;

[0060] Preferably, the second tension wheel 12 is connected with the tension arm 14; the tension arm 14 is connected with the driving mechanism, and the second tension wheel 12 connected with the tension arm 14 reciprocates by controlling the driving mechanism; preferably, the driving mechanism is a cylinder driving mechanism. Preferably, the cylinder driving mechanism is connected with the yarn take-up machine control system.

[0061] In this embodiment, the fiber winding method is provided. During the fiber running process, the second tension wheel 12 reciprocates towards the direction of approaching or moving away from the roller 2 (e.g. up and down as shown in the direction of the arrow), so that the difference of the tension on the fiber running to any position on the roller 2 is small, and the consistency is ensured as much as possible. This design can further avoid the large fluctuation of the fiber tension, improve the accuracy of the tension control, and thus ensure the quality and winding effect of the fiber. Figure 2

[0062] Embodiment 3

[0063] Preferably, the fiber winding method is provided. As shown in the direction of the arrow in the figure, the embodiment is further designed as follows: Figure 1 Figure 2 The first tension wheel 11, the second tension wheel 12, and the third tension wheel 13 apply a tension H to the fiber.

[0064] Preferably, H is 300-900 cN; preferably, H=M×N / 100; wherein M represents the number of filaments in one fiber bundle; N is a constant, ranging from 5 to 15, and the unit is cN; the unit of H is cN. It should be noted that: in this embodiment, the tension applied by the first tension wheel 11, the second tension wheel 12, and the third tension wheel 13 to the fiber is controlled according to the number of filaments in one fiber bundle, so as to match the tension with the number of filaments in the fiber, avoid the situation that the fiber bundle is too thin and the tension is too large, which causes the hairiness or breakage of the yarn; and avoid the situation that the fiber bundle is too thick and the tension is too small, which causes the slippage, loose winding, or yarn dropping during the unwinding process.

[0065] Embodiment 4

[0066] Preferably, the fiber winding method is provided. As shown in the direction of the arrow in the figure, the embodiment is further designed as follows:

[0067] Preferably, the fiber winding method is provided. As shown in the direction of the arrow in the figure, the embodiment is further designed as follows: Figure 2

[0068] ​​​The path of the fiber after bypassing the third tension wheel 12 to the first end position of the roller is a fourth straight line path; the path of the fiber after bypassing the third tension wheel to the second end position of the roller is a fifth straight line path; wherein the angle between the fourth straight line path and the roller is a4, which is 65-85°; the angle between the fifth straight line path and the roller is a4, which is 65-85°; the angle between the fourth straight line path and the fifth straight line path is a5, which is 25-45°. Through the above design, it is ensured that the tension of the fiber running to the first end and the second end is basically consistent, and the fiber running to the end reduces the fiber jumping and slipping, and improves the fiber winding stability.

[0069] Embodiment 5

[0070] Preferably, the embodiment provides a fiber winding method, and the embodiment is further designed as follows:

[0071] The drafting device includes a plurality of drafting rollers; wherein the fiber passes through the plurality of drafting rollers in sequence; wherein the last drafting roller passed through is defined as the first drafting roller;

[0072] The starting speed of the yarn collector needs to meet the following conditions:

[0073] V=V1+K; wherein,

[0074] V is the starting speed of the yarn collector, and the unit is m / min;

[0075] K is a constant, and the range is 5-30, and the unit is m / min;

[0076] V1 is the running speed of the fiber when passing through the first drafting roller, and the unit is m / min.

[0077] It should be noted that: (1) when the yarn is wound on the roller of the cam box of the yarn collector, if the initial starting speed of the yarn collector is too fast, the fiber will be broken; if it is too slow, the fiber will be wound in reverse and the roller will be broken. The setting of V1+K ensures that the fiber will not be broken due to high speed, and the fiber will not be wound in reverse due to slow speed. (2) The embodiment matches the yarn collection parameters (yarn collector starting speed) with the equipment (first drafting roller) to avoid fiber breakage, reverse winding and other phenomena during yarn collection.

[0078] 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 wire collecting machine (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 product of the rotation speed and the roller diameter can be converted into the running speed of the roller, that is, the running speed of the fiber; preferably, the detection device uses a speed detection probe. The control system controls the starting speed of the wire collecting machine to meet V=V1+K. The above configuration can improve the degree of automation of wire collecting.

[0079] Example 6

[0080] Preferably, this embodiment provides a fiber winding method, such as Figure 6 As shown, this embodiment further features the following design: the running fiber 3, which passes around the third tension pulley, passes through the fiber placement groove of the fiber placement device 6 and is then wound onto the roller 2 on the cam box. It should be noted that the fiber placement device 6 is mounted on a guide rod 7, which is arranged parallel to the roller 2. The fiber placement device 6 can slide back and forth on the guide rod 7, and during this sliding process, the running fiber 3 is wound onto the entire effective position of the roller 2 (including the ends and the middle), rather than being wound only at one location.

[0081] Preferably, the placement slot has a contact surface for contacting the fiber; wherein the contact surface is made of ceramic or stainless steel with a roughness Ra ≤ 0.1. This design reduces friction between the placement slot and the fiber, preventing the generation of fuzzy fibers.

[0082] Preferably, the laying trough includes a trough bottom and a first trough wall and a second trough wall that are arranged opposite to each other; the spacing between the first trough wall and the second trough wall is R, in mm; preferably, R is 0.5-4.5 mm. Preferably, R satisfies: R=A / (B×100); wherein A is the linear density of the fiber, in g / km, and B is a constant, in the range of 3.5-5.5, in g / (km·mm). It should be noted here that: in this embodiment, the spacing of the laying trough is matched with the linear density of the fiber to avoid the phenomenon of "the spacing is too large, when the wire is collected at high speed, the fiber filaments jump out of the laying device or jump with a large width, resulting in large tension fluctuations and other problems, which lead to poor fiber winding quality (such as uneven winding, yarn falling, etc.). At the same time, it also avoids the problem of "the spacing is too small, which causes friction between the laying device and the fiber, and ultimately causes fiber wear and hairiness and equipment wear".

[0083] In summary, the above embodiments of the present invention provide a fiber winding method. Through the design of the above embodiments, the winding process is matched with the equipment, and the winding process is matched with the fiber properties, thereby avoiding the situation of "loose fiber end face, yarn falling, fiber grinding or broken during operation", and finally preparing polyacrylonitrile fiber with a smooth and firm end face and no yarn falling, ensuring stable operation during the fiber winding process.

[0084] The application will be further illustrated by the following specific experimental examples:

[0085] Experimental Example 1

[0086] In this experimental example 1, polyacrylonitrile fibers (filaments) are wound, wherein the fibers enter the yarn winder through the drafting device (including multiple drafting rollers, and the last drafting roller is the first drafting roller), and then pass through the first tension roller, the second tension roller and the third tension roller of the yarn winder in sequence, and then pass through the yarn spreader to be wound on the roller drum of the yarn winder.

[0087] The actual winding speed of the fibers (i.e. the speed of the fibers passing through the first drafting roller) is 300 m / min, and the starting speed V of the yarn winder is 320 m / min. Here, the starting speed of the yarn winder satisfies: V = V1 + K; wherein V is the starting speed of the yarn winder, with the unit of m / min; K is a constant, with the unit of m / min, which is 20 m / min in this case, and satisfies the range of 5-30 m / min; V1 is the speed of the fibers passing through the first drafting roller, with the unit of m / min.

[0088] As shown in Figure 1 , after entering the yarn winder, the fiber path before passing through the first tension roller 11 is defined as the first straight path 2-1; the fiber path after passing through the first tension roller 11 and before passing through the second tension roller 12 is defined as the second straight path 2-2; and the fiber path after passing through the second tension roller 12 and before passing through the third tension roller 13 is defined as the third straight path 2-3. Wherein, 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. As shown in Figure 1 and 2 , during the running of the fibers, the tension arm 14 is controlled by the air cylinder, and the tension arm 14 controls the up-and-down reciprocating swing connected to the second tension roller 12 to control the tension of the fibers running to the two end positions and the middle position of the roller drum to be substantially consistent, and the swing distance of the second tension roller 12 is 30 mm.

[0089] 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°; and 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 that during the swing of the second tension roller, the angles of a1, a2 and a3 will change, but they are all within the above range.

[0090] The tension applied by the first tension wheel 11, the second tension wheel 12 and the third tension wheel 13 to the fiber is H; H is 350 cN; and H=MxN / 100; wherein M represents the number of filaments in the winding 1 fiber; M is 3000; N is a constant, in units of cN, and in this embodiment is 11.7 cN, which satisfies the range 5-15 cN.

[0091] As shown in FIG. 1, the fiber runs to the first end position of the roller after passing through the third tension wheel 12, and the path is a fourth straight line path; the fiber after passing through the third tension wheel runs to the second end position of the roller, and the path is a fifth straight line path; wherein the included angle a4 between the fourth straight line path and the roller is 75°; the included angle a4 between the fifth straight line path and the roller is 75°; and the included angle a5 between the fourth straight line path and the fifth straight line path is 30°. Figure 2

[0092] The material of the contact surface of the fiber on the fiber distributor is ceramic, and the roughness Ra is 0.1. The spacing R of the fiber distributor is 1 mm, the running fiber filament is 3k, and the linear density of the fiber is 350 g / km. R satisfies: R=A / (Bx100); wherein A is the linear density of the fiber, in units of g / km, and B is a constant, in units of g / (km·mm), specifically 3.5 g / (km·mm), which satisfies the range 3.5-5.5 g / (km·mm).

[0093] The actual picture of the polyacrylonitrile fiber wound in this experimental embodiment is shown in FIG. 2. Figure 3 The actual picture of the polyacrylonitrile fiber wound in this experimental embodiment is shown in FIG. 2. Figure 3 It can be seen that the end surface of the polyacrylonitrile fiber wound in this experimental embodiment is flat and compact, and there is no yarn falling.

[0094] Experimental Example 2

[0095] In this experimental embodiment 2, the polyacrylonitrile fiber (original filament) is wound, wherein the fiber passes through the drawing device (including a plurality of drawing rollers, and the last drawing roller is the first drawing roller) into the yarn collector, and then passes through the first tension wheel, the second tension wheel and the third tension wheel of the yarn collector in sequence, and then passes through the fiber distributor to be wound on the roller of the yarn collector.

[0096] The speed of the fiber passing through the first drawing roller is V1, which is 260 m / min, and the starting speed V of the yarn collector is 270 m / min. Here, the starting speed of the yarn collector satisfies: V=V1+K; wherein V is the starting speed of the yarn collector, in units of m / min; K is a constant, in units of m / min, and in this embodiment is 10 m / min, which satisfies the range 5-30 m / min; and V1 is the speed of the fiber passing through the first drawing roller, in units of m / min.

[0097] As shown in FIG. 1, the fiber runs to the first end position of the roller after passing through the third tension wheel 12, and the path is a fourth straight line path; the fiber after passing through the third tension wheel runs to the second end position of the roller, and the path is a fifth straight line path; wherein the included angle a4 between the fourth straight line path and the roller is 75°; the included angle a4 between the fifth straight line path and the roller is 75°; and the included angle a5 between the fourth straight line path and the fifth straight line path is 30°.​Figure 1 As shown, after entering the fiber collecting machine, the fiber path before passing through the first tension wheel 11 is defined as the first straight line path 2-1; the fiber path after passing through the first tension wheel 11 and before passing through the second tension wheel 12 is defined as the second straight line path 2-2; the fiber path after passing through the second tension wheel 12 and before passing through the third tension wheel 13 is defined as the third straight line path 2-3. Among them, the straight lines where the first straight line path 2-1, the second straight line path 2-2, and the third straight line path 2-3 are located intersect to form an acute triangle. Among them, as shown in Figure 1 and 2 As shown, during the running of the fiber, the tension arm 14 is controlled by the air cylinder, the tension arm 14 controls the up and down reciprocating swing of the second tension wheel 12 to control the tension of the fiber running to the two end positions of the roller to be basically consistent with the tension at the middle position, and the swing distance of the second tension wheel 12 is 20mm.

[0098] The included angle a1 between the first straight line path 2-1 and the second straight line path 2-2 is 70-80°; the included angle a2 between the second straight line path 2-2 and the third straight line path 2-3 is 25-40°; the included angle a3 between the third straight line path 2-3 and the first straight line path 2-1 is 60-75°. It should be noted that during the swing of the second tension wheel, the angles of a1, a2 and a3 will change, but they are all within the above range.

[0099] Among them, the tension applied by the first tension wheel 11, the second tension wheel 12 and the third tension wheel 13 to the fiber is H; H is 900cN; and H=M×N / 100; wherein M represents the number of filaments in one bundle of fiber; M is 12000; N is a constant, which is 7.5cN, and satisfies the range of 5-15cN.

[0100] Among them, as shown in Figure 2 The path of the fiber after passing through the third tension wheel 12 and running to the first end position of the roller is the fourth straight line path; the path of the fiber after passing through the third tension wheel and running to the second end position of the roller is the fifth straight line path; wherein the included angle a4 between the fourth straight line path and the roller is 75°; the included angle a4 between the fifth straight line path and the roller is 75°; the included angle a5 between the fourth straight line path and the fifth straight line path is 30°.

[0101] The material of the contact surface of the fiber contactor is ceramic, the roughness Ra is 0.1, the spacing R of the fiber contactor is 3 mm, the running fiber tows are 12k, and the linear density of the fiber is 1400 g / km. R satisfies: R=A / (B*100); wherein A is the linear density of the fiber, the unit is g / km, B is a constant, the unit is g / (km*mm), specifically 4.6 g / (km*mm), and satisfies the range 3.5-5.5 g / (km*mm).

[0102] The end surface of the wound polyacrylonitrile fiber in the experimental embodiment is flat and compact, and no yarn is dropped.

[0103] Experimental embodiment 3

[0104] The polyacrylonitrile fiber (original fiber) is wound in the experimental embodiment 3. After the fiber passes through the drafting device (including a plurality of drafting rollers, and the last drafting roller is the first drafting roller) and enters the fiber collector, it first passes through the first tension roller, the second tension roller and the third tension roller of the fiber collector in sequence, and then passes through the fiber contactor to be wound on the roller cylinder of the fiber collector.

[0105] 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 fiber collector is 350 m / min. Here, the starting speed of the fiber collector satisfies: V=V1+K; wherein V is the starting speed of the fiber collector, the unit is m / min; K is a constant, the unit is m / min, specifically 30 m / min, and satisfies the range 5-30 m / min; V1 is the speed of the fiber passing through the first drafting roller, the unit is m / min.

[0106] As shown in Figure 1 , after entering the fiber collector, the fiber path before passing through the first tension roller 11 is defined as the first straight line path 2-1; the fiber path after passing through the first tension roller 11 and before passing through the second tension roller 12 is defined as the second straight line path 2-2; and the fiber path after passing through the second tension roller 12 and before passing through the third tension roller 13 is defined as the third straight line path 2-3. The straight lines where the first straight line path 2-1, the second straight line path 2-2 and the third straight line path 2-3 are located intersect to form an acute triangle.

[0107] As shown in Figure 1 and 2 , in the fiber running process, the tension arm 14 is controlled by the air cylinder, the tension arm 14 controls the up-down reciprocating swing of the second tension roller 12 to control the tension of the fiber running to the two end positions and the middle position of the roller cylinder to be consistent, and the swing distance of the second tension roller 12 is 40 mm.

[0108] The angle a1 between the first linear path 2-1 and the second linear path 2-2 is 70-80°; the angle a2 between the second linear path 2-2 and the third linear path 2-3 is 25-40°; and the angle a3 between the third linear path 2-3 and the first linear path 2-1 is 60-75°. It should be noted that the angles a1, a2, and a3 may vary during the swinging of the second tension pulley, but remain within the aforementioned ranges.

[0109] Among them, the tension applied to the fiber by the first tension wheel 11, the second tension wheel 12, and the third tension wheel 13 is H; H is 600 cN; and H=M×N / 100; wherein M represents the number of monofilaments in a bundle of wound fibers; M is 6000; N is a constant, the unit is cN, specifically 10 cN, and the range is 5-15 cN.

[0110] Among them, such as Figure 2 As shown, the path of the fiber after bypassing the third tension wheel 12 and running to the first end position of the roller is the fourth straight path; the path of the fiber after bypassing the third tension wheel and running to the second end position of the roller is the fifth straight path; wherein, the angle a4 between the fourth straight path and the roller is 70°; the angle a4 between the fifth straight path and the roller is 70°; the angle a5 between the fourth straight path and the fifth straight path is 40°

[0111] The fiber contact surface on the fiber placer is made of ceramic with a roughness Ra of 0.1. The placement pitch R is 2 mm. The fiber tow is 6 k, and the fiber linear density is 800 g / km. R satisfies the following equation: R = A / (B × 100), where A is the fiber linear density in g / km, and B is a constant in g / (km·mm), specifically 4 g / (km·mm), within the range of 3.5-5.5 g / (km·mm).

[0112] The end surface of the rolled polyacrylonitrile fiber in this experimental example is flat and tight, without any yarn falling.

[0113] Comparative Example 1

[0114] In comparative example 1, polyacrylonitrile fiber (raw yarn) is wound, wherein the fiber passes through a drafting device (including multiple drafting rollers, the last drafting roller is the first drafting roller) and enters the wire collecting machine. Then, the fiber passes through the first tension wheel, the second tension wheel and the third tension wheel of the wire collecting machine in sequence, and then passes through the wire laying device and is wound onto the roller of the wire collecting machine for winding.

[0115] Compared with Experimental Example 1, in Comparative Example 1:

[0116] The fiber path to be passed through the first tension wheel defines a first straight line path; the fiber path to be passed through the second tension wheel after passing through the first tension wheel is positioned as a second straight line path; and the fiber path to be passed through the third tension wheel after passing through the second tension wheel is positioned as a third straight line path. The straight lines where the first straight line path, the second straight line path and the third straight line path are located intersect to form an obtuse triangle.

[0117] The included angle a1 between the first straight line path and the second straight line path is 100°-120°; the included angle a2 between the second straight line path and the third straight line path is 30°-40°; and the included angle a3 between the third straight line path and the first straight line path is 30°-40°.

[0118] The swing distance of the second tension wheel is 5mm.

[0119] The other conditions are consistent with those in Experimental Example 1.

[0120] In the Comparative Example 2, the end surface of the wound polyacrylonitrile fiber has a serious end surface fluff, and the fiber is prone to be pulled out and broken during operation.

[0121] Comparative Example 2

[0122] In the Comparative Example 2, the polyacrylonitrile fiber (original fiber) is wound, wherein the fiber passes through the drafting device (including a plurality of drafting rollers, and the last drafting roller is the first drafting roller) into the yarn collector, and then sequentially passes through the first tension wheel, the second tension wheel and the third tension wheel of the yarn collector, and then passes through the yarn spreader to be wound on the roller of the yarn collector.

[0123] In the Comparative Example 2, the spacing R of the yarn spreader is 4mm, which does not satisfy R=A / (B×100); wherein A is the linear density of the fiber, and the unit is g / km; B is a constant, and the unit is g / (km·mm), and the range is 3.5-5.5g / km. The other conditions are consistent with those in Experimental Example 1.

[0124] In this regard, the Comparative Example 2 is actually an example of the present application, but it is not a preferred example.

[0125] The actual picture of the wound polyacrylonitrile fiber in the Comparative Example 2 is shown in Figure 4 The, from Figure 4 It can be seen that the wound polyacrylonitrile fiber has end surface yarn drop, and is prone to yarn entanglement and breakage during carbonization unwinding, which affects the operation.

[0126] Comparative Example 3

[0127] The polyacrylonitrile fiber (raw silk) in Comparative Example 3 is wound, wherein the fiber enters the silk winder through the drafting device (including a plurality of drafting rollers, and the last drafting roller is the first drafting roller), and then sequentially passes through the first tension wheel, the second tension wheel and the third tension wheel of the silk winder, and then passes through the silk spreader to be wound on the roller of the silk winder.

[0128] Compared with Experimental Example 1, in Comparative Example 3, the first tension wheel 11, the second tension wheel 12 and the third tension wheel 13 exert a tension H of 50 cN on the fiber, and H does not satisfy H = M x N / 100; wherein M represents the number of filaments in one bundle of fiber during winding; N is a constant, and the unit is cN, and the range is 5-15 cN; the unit of H is cN.

[0129] The actual picture of the polyacrylonitrile fiber wound in Comparative Example 3 is shown in Figure 5 From the above, Figure 5 It can be seen that the end face of the wound polyacrylonitrile fiber is loose, and the yarn falling is serious. However, the overall winding effect is better than that of Comparative Example 1.

[0130] Comparative Example 4

[0131] The polyacrylonitrile fiber (raw silk) in Comparative Example 4 is wound, wherein the fiber enters the silk winder through the drafting device (including a plurality of drafting rollers, and the last drafting roller is the first drafting roller), and then sequentially passes through the first tension wheel, the second tension wheel and the third tension wheel of the silk winder, and then passes through the silk spreader to be wound on the roller of the silk winder.

[0132] Compared with Experimental Example 1, in Comparative Example 4, the starting speed of the silk winder is 350 m / min, which does not satisfy V = V1 + K, and the rest is the same as Example 1.

[0133] Here, due to the too fast starting speed of the silk winder in Comparative Example 4, the polyacrylonitrile fiber wound on the frame is broken after entering the silk winder.

[0134] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the present application still belongs to the scope of the technical solution of the present application.

Claims

1. A fiber winding method, characterized in that: The fiber winding method comprises the following steps: After the fiber passes through the drafting device and enters the winder, it first passes through the first tension wheel, the second tension wheel and the third tension wheel of the winder in sequence, and then is wound onto the winding device of the winder for winding; Among them, after entering the wire collecting machine, the fiber path to be passed through the first tension wheel is defined as the first straight path; after passing the first tension wheel, the fiber path to be passed through the second tension wheel is positioned as the second straight path; after passing the second tension wheel, the fiber path to be passed through the third tension wheel is positioned as the third straight path; Wherein, the straight lines on which the first straight path, the second straight path, and the third straight path are located intersect to form an acute triangle; The winding device includes a cam box and a roller mounted on the cam box. During fiber running, the second tension wheel is controlled to swing back and forth in directions close to and away from the roller, so that the difference in tension on the fiber at any position on the roller is less than 15 cN. During winding, when the fiber runs toward the middle position of the roller, the second tension wheel is controlled to swing away from the roller; when the fiber runs toward the end position of the roller, the second tension wheel is controlled to swing toward the roller. The path of the fiber after bypassing the third tension wheel and running to the first end position of the roller is a fourth straight path; the path of the fiber after bypassing the third tension wheel and running to the second end position of the roller is a fifth straight path; The angle between the fourth straight path and the roller is a4; the angle between the fifth straight path and the roller is a4; wherein a4 is 65-85°; An included angle a5 between the fourth straight path and the fifth straight path is 25-45°.

2. The fiber winding method according to claim 1, characterized in that: 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°; and the angle a3 between the third straight path and the first straight path is 60-75°.

3. The fiber winding method according to claim 1, characterized in that: The swing distance of the second tension wheel is 10-50 mm.

4. The fiber winding method according to claim 1, characterized in that: The second tension wheel is connected to the tension arm; the tension arm is connected to the driving mechanism, and the second tension wheel connected to the tension arm is controlled by the driving mechanism to swing back and forth.

5. The fiber winding method according to claim 1, characterized in that: The tension applied to the fiber by the first tension wheel, the second tension wheel, and the third tension wheel is H; wherein, H is 300-900 cN; or H=M×N / 100; where M represents the number of monofilaments in a rolled-up fiber bundle; N is a constant ranging from 5 to 15, with the unit being cN; and the unit of H is cN.

6. The fiber winding method according to claim 1, characterized in that: The drafting device includes a plurality of drafting rollers; wherein the fiber passes through the plurality of drafting rollers in sequence; wherein the last drafting roller passed by the fiber is defined as the first drafting roller; The starting speed of the wire collecting machine must meet the following conditions: V=V1+K; where V is the starting speed of the wire collecting machine, in m / min; K is 5-30m / min; V1 is the running speed of the fiber when it passes through the first drafting roller, in m / min.

7. The fiber winding method according to claim 6, characterized in that: 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 wire collecting machine.

8. The fiber winding method according to claim 7, characterized in that: The detection device is mounted on the bottom of the roller bearing of the first drafting roller.

9. The fiber winding method according to claim 7, characterized in that: The detection device uses a speed detection probe.

10. The fiber winding method according to claim 1, characterized in that: The running fiber passes around the third tension wheel, passes through the laying groove of the fiber laying device, and is wound on the roller on the cam box.

11. The fiber winding method according to claim 10, characterized in that: The fiber placement slot has a contact surface for contacting the fiber; wherein the contact surface is made of ceramic or stainless steel, and has a roughness Ra≤0.

1.

12. The fiber winding method according to claim 10, characterized in that: The fiber placement trough comprises a trough bottom and a first trough wall and a second trough wall arranged opposite to each other; the distance between the first trough wall and the second trough wall is R, in mm.

13. The fiber winding method according to claim 12, characterized in that: R is 0.5-4.5mm.

14. The fiber winding method according to claim 12, characterized in that: R satisfies: R=A / (B×100); Wherein, A is the linear density of the fiber, in g / km; B is 3.5-5.5 g / (km·mm).

15. The fiber winding method according to any one of claims 1 to 14, characterized in that: The fiber is polyacrylonitrile fiber.

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