A method and apparatus for continuously stabilizing a filament

Abstract

The present application belongs to the technical field of fiber filament collecting, and discloses a method and device for continuously and stably collecting filaments, which simple device comprises a fixing rod, an adjusting rod, a fork and a collecting cylinder; the fixing rod and the adjusting rod are arranged vertically and arranged with a left-right interval, and the fixing rod is located at the right side of the adjusting rod; the fork and the collecting cylinder are located below X, and X is the adjusting rod or the fixing rod; at least one guide wheel is installed on each of the fixing rod and the adjusting rod, and the central axis of the guide wheel is parallel to the front-back direction; the method is as follows: in the process of collecting the bundled fibers, the change of the linear speed of the bundled fibers caused by the reciprocating movement of the fork is balanced by using the overhanging effect of the bundled fibers due to the dead weight, so as to maintain the uniform tension of the bundled fibers. The present application can avoid the problem of uneven draft force caused by the left-right reciprocating movement of the bundled fibers and other factors, thereby avoiding broken filaments.

Description

Technical Field

[0001] This invention belongs to the field of low-strength, high-brittle fiber filament winding technology, specifically relating to a method and apparatus for continuous and stable winding. Background Technology

[0002] High-performance carbon fibers prepared from pitch fibers possess advantages such as high modulus, high thermal conductivity, and low thermal expansion, making them widely applicable in fields requiring high dimensional stability and thermal conductivity. Polycarbosilanes, used as silicon carbide precursors, are primarily used in the preparation of high-tech silicon carbide ceramic materials. However, pitch fibers and other low-strength, highly brittle inorganic fibers are prone to breakage during spinning and winding, hindering the production of continuous filaments. Therefore, to obtain continuous filaments of low-strength, highly brittle fibers, uniform tension must be maintained during winding and post-processing to avoid uneven fiber diameters and filament breakage caused by excessive bending, friction, or other mechanical damage.

[0003] Currently, fiber take-up is generally achieved by rotating a take-up drum driven by a winding motor. The fork reciprocates along a direction parallel to the take-up drum, causing the fiber bundle to be laid in a cross-web pattern on the take-up drum. The necessity of this process is mainly twofold: 1. It can reduce the direct contact area between single-layer fibers, avoid local pressure adhesion, and prevent breakage during subsequent unwinding; 2. It can make the fiber bundle evenly distributed on the drum surface, avoid repeated stacking at the same position leading to tension accumulation, and balance the stress distribution during the winding process.

[0004] However, the reciprocating motion of the fork along a direction parallel to the take-up drum causes periodic changes in the tension force on the fiber bundle. Low-strength, highly brittle fibers are extremely sensitive to these changes. When the tension force changes along the fiber bundle to the guide roller, it is very easy to cause damage due to a sudden increase. As a result of this variation, low-strength, highly brittle fibers are prone to a large number of fiber breaks during take-up, making it impossible to take up the fiber continuously and stably.

[0005] Patent CN203959519U discloses a mesophase pitch spinning winding device. The fiber is wound around the bottom of a guide wheel and onto a winding wheel. The winding wheel speed is adjusted by the change in the angular displacement sensor signal on the guide wheel caused by the change in fiber tension, thereby controlling the fiber tension. However, this device still has some drawbacks: 1. The high winding wheel speed results in a time delay in the angular displacement sensor signal change, leading to inaccurate control; 2. Reducing the winding speed to decrease the fiber tension will reduce the winding efficiency.

[0006] Patent CN108249222B discloses a continuous winding method for mesophase pitch carbon fiber precursor. This method first uses three guide rollers to change the direction of the precursor bundle, reduce friction, and decrease the degree of bending. Then, a tension sensing system at the fourth guide roller adjusts the unwinding speed, thereby regulating the tension on the precursor bundle and achieving continuous winding. However, this device also has drawbacks: 1. The mechanical structure of the tension control system is complex, resulting in low tension control accuracy; 2. This patent achieves tension control on the precursor bundle by lowering the unwinding roller, reducing winding efficiency.

[0007] Therefore, a method and apparatus for continuous and stable yarn take-up are needed to solve the above problems, which is of great significance. Summary of the Invention

[0008] The purpose of this invention is to solve the problems existing in the prior art and provide a method and apparatus for continuous and stable fiber winding. It can effectively control the tension changes of the bundled fibers caused by the reciprocating motion of the fork along a direction parallel to the winding drum during the fiber winding process, thereby avoiding problems such as uneven fiber diameter and fiber breakage, and significantly improving the stability and continuity of the fiber winding process for low-strength and brittle fibers.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A continuous and stable fiber winding method utilizes the sag effect generated by the weight of the bundled fibers during the winding process to balance the changes in the linear velocity of the bundled fibers caused by the reciprocating motion of the fork, thereby maintaining uniform tension of the bundled fibers. The bundled fibers are obtained through melt spinning. Assuming there are 1000 spinnerets on a spinneret, the fibers coming out of each spinneret are monofilaments, and the whole composed of 1000 monofilaments is the bundled fiber.

[0011] The present invention also provides a continuous and stable winding apparatus for implementing the method of continuous and stable winding as described above, comprising a fixed rod, an adjusting rod, a shift fork, and a winding drum;

[0012] The fixed rod and the adjusting rod are arranged vertically with left and right spacing, and the fixed rod is located to the right of the adjusting rod;

[0013] The shift fork and take-up drum are located below X, which is an adjusting rod or a fixed rod. The shift fork is located above the take-up drum, and the length direction of the take-up drum is parallel to the left and right direction.

[0014] Both the fixed rod and the adjusting rod are equipped with at least one guide wheel, and the central axis of the guide wheel is parallel to the front-back direction.

[0015] As a preferred technical solution:

[0016] As described above, a continuous and stable yarn take-up device is provided, wherein at least one guide wheel is equipped with a single-roller tension sensor; the base material of each guide wheel is polyetheretherketone (PEEK), and the surface is treated with a ceramic coating; the wheel groove has a U-shaped structure; the outer diameter of the wheel is 100 mm, and the inner diameter of the wheel is 80 mm; the wheel body has a pre-set microporous channel inside, which is connected to an external lubrication pipeline to achieve continuous drip lubrication in the wheel groove.

[0017] As described above, the distance W between the fixed rod and the adjusting rod is 0.2-3m, the horizontal distance between the lowest guide wheel on X and the center of the take-up drum along the left and right direction is 0, the vertical distance H between the lowest guide wheel on X and the shift fork is 0.5-2m, and the length x1 of the take-up drum is 0.3m.

[0018] The continuous and stable wire take-up device described above further includes a bracket, an upper rack, an upper gear, a lower rack, a lower gear, and a crank handle; a fixed rod is fixedly connected to the bracket; the upper rack and the lower rack are both parallel to the left and right directions, and their support surfaces are both fixedly connected to the bracket; the upper gear and the lower gear are respectively fixedly sleeved on the upper and lower ends of the adjusting rod, the upper gear meshing with the upper rack, and the lower gear meshing with the lower rack; the crank handle is fixedly connected to the upper end of the adjusting rod and is used to drive the adjusting rod to rotate around its own central axis.

[0019] The continuous and stable take-up device described above further includes a first constant speed roller and a second constant speed roller located to the upper right of the fixed rod. The first constant speed roller is located to the lower right of the second constant speed roller. The vertical distance between the second constant speed roller and the highest guide wheel on the fixed rod is 0.5-3m, and the horizontal distance along the left and right directions is 0.

[0020] The device for continuous and stable wire take-up as described above also includes a human-computer interactive computer;

[0021] The human-computer interaction computer includes a physical button bar, a microcomputer, and a parameter display screen. The physical button bar includes an up button, down button, left button, right button, OK button, back button, and power button. The up and down buttons can be used to select the type of parameter to be input and to increase or decrease the value of the parameter. The left and right buttons can be used to select the position of the parameter value to be modified, improving the efficiency of parameter modification. The OK button can be used to confirm the type of parameter to be modified or to confirm the modified parameter value. The back button can be used to return to the previous screen display page. The operation sequence consists of four pages. The first page displays fiber parameter selection options and spinning parameter selection options. Selecting fiber parameters via physical buttons leads to the second page, which displays five fiber parameter input items: fiber type, fineness, number of filaments, monofilament diameter, and raw material viscosity. Once the raw material viscosity is confirmed, the system automatically proceeds to the third page, which displays five spinning parameter input items: spinning speed, take-up bobbin length, distance between the fork and guide wheel, bundled fiber arrangement pitch, and take-up bobbin circumference. Confirming the take-up bobbin diameter parameter automatically proceeds to the fourth page. The output displays: number of drape lines - distance W between the fixed rod and the adjusting rod, and single roller tension value (accuracy 0.01cN).

[0022] The physical button bar is used to input parameters, including the length of the take-up spool x1, the rotational speed of the take-up spool v1, the pitch of the bundled fibers on the take-up spool x2, the vertical distance H between the lowest guide wheel on X and the shift fork, the fineness of the bundled fibers D, the diameter of the monofilament d1, the diameter of the take-up spool d2, the viscosity η of the melt spinning raw material, and the distance dx that the monofilament moves from the molten state to the stable solid state during melt spinning.

[0023] The microcomputer is used to find W and N that satisfy the following relationship and displays it on the parameter display screen:

[0024] 0 < δ1 - δ2 < 10%δ T ;

[0025] ;

[0026] ;

[0027] ;

[0028] ;

[0029] ;

[0030] ;

[0031] ;

[0032] ;

[0033] ;

[0034] In the formula, the unit of η is Pa·s;

[0035] The unit of dx is meters;

[0036] g is the acceleration due to gravity, with a value of 9.8 m / s². 2 ;

[0037] The unit of W is meters (m);

[0038] N is a positive integer with no unit;

[0039] The unit of x1 is m;

[0040] The unit of v1 is r / min;

[0041] The unit of x2 is m;

[0042] The unit of H is m;

[0043] The unit of D is denier;

[0044] The unit of d1 is meters;

[0045] The unit of d2 is meters;

[0046] All other parameters are eliminated intermediate variables.

[0047] It should be noted that the above formula only requires the accurate substitution of the values ​​of each parameter, and does not require that the units on both sides of the formula be completely consistent in form.

[0048] The present invention also provides a method for continuous and stable take-up using a device for continuous and stable take-up as described above. The bundled fibers are wound between each guide wheel to form N suspension lines between the fixed rod and the adjusting rod. Then, the shift fork is controlled to drive the bundled fibers to reciprocate between the center of the take-up drum and the edge of the take-up drum, and the take-up drum is simultaneously controlled to rotate around its own central axis.

[0049] The distance between the fixed rod and the adjusting rod (i.e., the span of the suspension line) is W;

[0050] The following relationships exist: length x1 of the take-up spool, rotational speed v1 of the take-up spool, pitch x2 of the bundled fibers on the take-up spool, vertical distance H between the lowest guide wheel and the shift fork on X, fineness D of the bundled fibers, diameter d1 of the monofilament, diameter d2 of the take-up spool, viscosity η of the melt spinning raw material, distance dx that the monofilament moves from the molten state to the stable solid state during melt spinning, and W and N satisfy the following equation:

[0051] 0 < δ1 - δ2 < 10%δ T ;

[0052] ;

[0053] ;

[0054] ;

[0055] ;

[0056] ;

[0057] ;

[0058] ;

[0059] ;

[0060] ;

[0061] In the formula, the unit of η is Pa·s;

[0062] The unit of dx is meters;

[0063] g is the acceleration due to gravity, with a value of 9.8 m / s². 2 ;

[0064] The unit of W is meters (m);

[0065] N is a positive integer with no unit;

[0066] The unit of x1 is m;

[0067] The unit of v1 is r / min;

[0068] The unit of x2 is m;

[0069] The unit of H is m;

[0070] The unit of D is denier;

[0071] The unit of d1 is meters;

[0072] The unit of d2 is meters;

[0073] All other parameters are eliminated intermediate variables.

[0074] As a preferred technical solution:

[0075] As described above, the tensile strength of the bundled fibers is less than 30 MPa and the elongation at break is less than 0.5%, meaning that the bundled fibers are low-strength, high-brittle filaments, such as pitch fiber, polycarbosilane fiber, polyaluminoxane, polysilazane fiber, etc. The method of the present invention is applicable to a wide variety of bundled fibers, but its value is more prominent in the field of low-strength, high-brittle filaments.

[0076] As described above, the continuous and stable winding time of the bundled fiber is 15-20 minutes. The continuous and stable winding time is the time from the start of winding to the first occurrence of fiber breakage. For low-strength, high-brittle filaments, the continuous and stable winding time of the prior art without this device is 1-2 minutes. The continuous and stable winding time of the present invention is 15-20 minutes, which is much higher than that of the prior art.

[0077] Invention principle:

[0078] This invention discovers that, in order to reduce the impact of tension fluctuations on the bundled fibers on spinning and winding, the change in the stretching force on the bundled fibers should satisfy: 0 < δ1 - δ2 < 10%δ T ;

[0079] In the formula, δ T The tensile force (MPa) on the bundled fibers at the highest point of the suspension line when the fork does not move the bundled fibers along the take-up drum.

[0080] δ1 is the tensile force (MPa) exerted on the bundled fibers at the highest point of the suspension line when the fork drives the bundled fibers to the edge of the take-up drum.

[0081] δ2 is the tensile force (MPa) exerted on the bundled fibers at the highest point of the suspension line when the fork drives the bundled fibers to the center of the take-up drum.

[0082] If there are multiple suspension lines, then under ideal conditions, the arc lengths of each suspension line are equal, the corresponding δ1 is equal, and the corresponding δ2 is equal.

[0083] We will now discuss the following three scenarios:

[0084] (1) When the fork does not drive the bundled fibers to move along the take-up drum, the span of the suspension line is W (m), and the shape factor characterizing the morphological characteristics of the suspension line is a.

[0085] At the highest point of the suspension line, the tensile force on the bundled fibers is δ. T (MPa), due to the relationship between melt flow deformation and viscosity during melt spinning, therefore, ,Right now In the formula, dv is the velocity change of the monofilament from the spinneret to the point where the velocity stabilizes (m / s), dx is the distance the monofilament moves from the molten state to the stable solid state during melt spinning (m), and η is the viscosity of the melt spinning raw material (Pa·s).

[0086] Since the monofilament undergoes an acceleration process after being extruded from the spinneret until it reaches a stable speed, and during this process, it is assumed that the initial extrusion speed of the monofilament is negligible relative to the linear velocity of the take-up bobbin (i.e., the initial speed is approximately 0), therefore In the formula, dv is the velocity change of the monofilament from the spinneret to the point where the velocity stabilizes (m / s), and v2 is the linear velocity of the take-up drum (m / s). Therefore, formula ① can be derived as follows:

[0087] ①

[0088] According to the theory of suspension lines and the principle of mechanical equilibrium, the tensile force on the bundled fibers at the lowest point of the suspension line is... Where ρ is the bulk density of the monofilament (kg m³) -3 g is the acceleration due to gravity (9.8 m / s²). 2 According to the formula for suspension tension, In the formula, x is the horizontal coordinate of a point on the suspension line. Therefore, formula ② can be derived as follows:

[0089] ②

[0090] The arc length of the suspension line is L (m). According to calculus, the infinitesimal element of the arc length of the suspension line is... ,therefore In the formula, y is the horizontal coordinate of a point on the suspension line. Therefore, formula ③ can be derived as follows:

[0091] ③

[0092] (2) When the fork drives the bundled fibers to the edge of the take-up cylinder, the span of the suspension line is W (m), and the shape factor that characterizes the morphological features of the suspension line is a1.

[0093] Formula ④ can be derived from formula ②, as follows:

[0094] ④

[0095] Formula ⑤ can be derived from formula ③, as follows:

[0096] ⑤

[0097] (3) When the fork drives the bundled fibers to the center of the take-up drum, the span of the suspension line is W (m), and the shape factor that characterizes the morphological features of the suspension line is a2.

[0098] Formula ⑥ can be derived from formula ②, as follows:

[0099] ⑥

[0100] Formula ⑦ can be derived from formula ③, as follows:

[0101] ⑦

[0102] If the bundled fibers are located at the center of the take-up drum when the fork is not moving them along the drum, then formula ⑧ holds true, as follows:

[0103] ⑧

[0104] If the bundled fibers are located at the edge of the take-up drum when the fork is not moving them along the drum, then formula ⑨ holds true, as follows:

[0105] 9

[0106] In the formula, N is the change in the length (m) of the bundled fiber between the guide wheel and the fork when the bundled fiber moves from the center of the take-up drum to the edge of the take-up drum. N is the number of suspension lines.

[0107] Combining formulas ③, ⑤, and ⑧, we obtain formula ⑩, as follows:

[0108] ⑩

[0109] Combining formulas ③, ⑦, and ⑨, we obtain formula ⑪, as follows:

[0110] ⑪

[0111] According to formula ①, after determining the values ​​of η, v2, and dx, δ can be obtained. T The value of .

[0112] According to formula ②, we can determine ρ, W, and δ. T After obtaining the value of 'a', the value of 'a' can be obtained.

[0113] According to formulas ⑩ and ⑪, we can determine a, W, After obtaining the values ​​of N, the values ​​of a1 and a2 can be obtained.

[0114] According to formula ④, once the values ​​of a1, ρ, and W are determined, the value of δ1 can be obtained.

[0115] According to formula ⑥, once the values ​​of a2, ρ, and W are determined, the value of δ2 can be obtained.

[0116] In summary, ρ, W, After obtaining the values ​​of N, η, v2, and dx, δ can be obtained. T The values ​​of δ1 and δ2 are only required to be controlled in actual production processes; ρ, W, and δ2 are the most important parameters. The values ​​of N, η, v2, and dx must satisfy the following relationship:

[0117] 0 < δ1 - δ2 < 10%δ T ;

[0118] ;

[0119] ;

[0120] ;

[0121] ;

[0122] ;

[0123] ;

[0124] In the formula, δ T The tensile force (MPa) on the bundled fibers at the highest point of the suspension line when the fork does not move the bundled fibers along the take-up drum.

[0125] δ1 is the tensile force (MPa) exerted on the bundled fibers at the highest point of the suspension line when the fork drives the bundled fibers to the edge of the take-up drum.

[0126] δ2 is the tensile force (MPa) exerted on the bundled fibers at the highest point of the suspension line when the fork drives the bundled fibers to the center of the take-up drum.

[0127] ρ is the bulk density of a single filament (kg m³). -3 );

[0128] W is the span value of the suspension line (m);

[0129] The change in the length (m) of the bundled fiber between the guide wheel and the fork when the fork drives the bundled fiber from the center of the take-up drum to the edge of the take-up drum.

[0130] N is the number of suspension lines;

[0131] η is the viscosity (Pa·s) of the melt-spinning raw material;

[0132] v2 is the linear velocity of the take-up drum (m / s);

[0133] dx is the distance (m) that the monofilament moves from the molten state to the stable solid state during melt spinning.

[0134] Beneficial effects:

[0135] (1) In the process of taking in bundled fibers, the present invention utilizes the drooping effect generated by the weight of the bundled fibers to balance the changes in the linear velocity of the bundled fibers caused by the reciprocating motion of the fork, thereby maintaining the uniform tension of the bundled fibers. When the bundled fibers move between the guide wheels, the drooping portion of the bundled fibers will generate a tension force due to its own gravity. This tension force can effectively and automatically compensate for the uneven stretching force caused by factors such as the reciprocating motion of the bundled fibers. In addition, the device avoids the limitations of the adjustment range and the adjustment delay of other traditional stretching force regulators. It has a simple structure, wide application, and high reliability.

[0136] (2) The simple device for continuous and stable fiber winding of the present invention has a simple structure, is easy to operate, and has a wide range of applications. In addition to winding pitch fiber, it can also be used for winding other low-strength and high-brittle fibers. The stretching force is controlled without delay and has good development prospects. Attached Figure Description

[0137] Figure 1 This is a schematic diagram of the continuous and stable take-up device of the present invention when it has three suspension lines;

[0138] Figure 2 This is an enlarged top view of the rack, gear, and crank handle in the continuous and stable take-up device of the present invention.

[0139] Figure 3 This is a schematic diagram of the human-computer interaction computer system of the present invention;

[0140] Figure 4 This is a schematic diagram of the fiber parameter page of the human-computer interaction computer system of the present invention;

[0141] Figure 5 This is a schematic diagram of the spinning condition page of the human-computer interaction computer system of the present invention;

[0142] Figure 6 This is a schematic diagram of the output page of the human-computer interaction computer system of the present invention;

[0143] Figure 7 This is a graph showing the relationship between the speed of the bundled fibers at the guide wheel directly above the take-up cylinder and time.

[0144] Figure 8 When using a single suspension line to wind up pitch fibers according to the present invention, δ1, δ2, δ T Graph showing the change of W;

[0145] Figure 9 When using two suspension lines δ1, δ2, and δ3 to wind up pitch fibers according to the present invention T Graph showing the change of W;

[0146] Figure 10When using three suspension lines δ1, δ2, and δ3 to wind up pitch fibers according to this invention, T Graph showing the change of W;

[0147] In the diagram, 120-first constant speed roller, 130-second constant speed roller, 200-bundled fiber, 310-support, 321-guide roller, 325-single roller tension sensor, 331-fixed rod, 332-adjusting rod, 333-crank handle, 335-rack, 336-gear, 410-shift fork, 420-take-up spool, 500-human-machine interface computer, 510-physical button bar, 520-parameter display screen, 530-microcomputer. Detailed Implementation

[0148] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0149] The test methods for the relevant performance indicators in the following embodiments and comparative examples are as follows:

[0150] Tensile strength and elongation at break: The tensile strength and elongation at break of the samples were tested using a monofilament fiber strength depth tester in accordance with GBIT 31290-2022 standard.

[0151] A continuous and stable fiber winding method utilizes the sag effect generated by the weight of the bundled fibers during the winding process to balance the changes in the linear velocity of the bundled fibers caused by the reciprocating motion of the fork, thereby maintaining uniform tension of the bundled fibers. The bundled fibers are obtained through melt spinning.

[0152] A device for implementing the above-mentioned method of continuous and stable yarn take-up, such as... Figures 1-2 As shown, it includes a fixed rod 331, an adjusting rod 332, a shift fork 410, a take-up drum 420, a bracket 310, an upper rack, an upper gear, a lower rack, a lower gear, a crank handle 333, a human-machine interface computer 500, and a first constant speed roller 120 and a second constant speed roller 130 on the upper right of the fixed rod 331.

[0153] The fixed rod 331 and the adjusting rod 332 are arranged vertically and spaced left and right with a spacing W of 0.2-3m. The fixed rod 331 is located to the right of the adjusting rod 332.

[0154] The shift fork 410 and the take-up drum 420 are located below X, where X is the adjusting rod 332 or the fixing rod 331, and the shift fork 410 is located above the take-up drum 420.

[0155] The length of the take-up spool 420 is parallel to the left-right direction, and the length x1 of the take-up spool 420 is 0.3m;

[0156] At least one guide wheel 321 is installed on both the fixed rod 331 and the adjusting rod 332, and the central axis of the guide wheel 321 is parallel to the front-back direction;

[0157] The base material of each guide wheel 321 is polyetheretherketone, and the surface is treated with ceramic coating; the wheel groove has a U-shaped structure; the outer diameter of the wheel is 100mm and the inner diameter of the wheel is 80mm; the wheel body has a pre-set microporous channel inside, which is connected to the external lubrication pipeline;

[0158] The horizontal distance between the center of the lowest guide roller 321 on X and the center of the take-up drum 420 in the left-right direction is 0, and the vertical distance H between the lowest guide roller 321 on X and the shift fork 410 is 0.5-2m.

[0159] At least one guide roller 321 is equipped with a single roller tension sensor 325;

[0160] The fixing rod 331 is fixedly connected to the bracket 310;

[0161] like Figure 2 As shown, both the upper and lower racks are parallel to the left and right directions, and their support surfaces are fixedly connected to the bracket 310. The upper gear 336 and the lower gear are respectively fixedly sleeved on the upper and lower ends of the adjusting rod 332. The upper gear 336 meshes with the upper rack 335, and the lower gear meshes with the lower rack. The upper rack, lower rack, upper gear 336, and lower gear can be designed to be made of magnetic materials, so that the upper gear 336 and the upper rack 335 are magnetically attracted when they mesh, and the lower gear and the lower rack are magnetically attracted when they mesh, to prevent the upper gear 336 and the lower gear from falling off the upper rack and lower rack, respectively.

[0162] The crank handle 333 is fixedly connected to the upper end of the adjusting rod 332, and is used to drive the adjusting rod 332 to rotate around its own central axis;

[0163] The first constant speed roller 120 is located to the lower right of the second constant speed roller 130. The vertical distance between the second constant speed roller 130 and the highest guide wheel 321 on the fixed rod 331 is 0.5-3m, and the horizontal distance along the left and right directions is 0.

[0164] The human-computer interaction computer 500 includes a physical button bar 510, a microcomputer 530, and a parameter display screen 520;

[0165] The physical button bar 510 is used to input parameters, including the length x1 of the take-up spool 420, the rotational speed v1 of the take-up spool 420, the pitch x2 of the bundled fibers on the take-up spool, the vertical distance H between the lowest guide wheel 321 on X and the shift fork 410, the fineness D of the bundled fibers, the diameter d1 of the monofilament, the diameter d2 of the take-up spool 420, the viscosity η of the melt spinning raw material, and the distance dx that the monofilament moves from the molten state to the stable solid state during melt spinning.

[0166] Microcomputer 530 is used to find W and N that satisfy the following relationship and displays it on parameter display screen 520:

[0167] 0 < δ1 - δ2 < 10%δ T ;

[0168] ;

[0169] ;

[0170] ;

[0171] ;

[0172] ;

[0173] ;

[0174] ;

[0175] ;

[0176] ;

[0177] In the formula, η is in Pa·s; dx is in meters; and g is the acceleration due to gravity, which is 9.8 m / s². 2 The unit of W is m; N is a positive integer with no unit; the unit of x1 is m; the unit of v1 is r / min; the unit of x2 is m; the unit of H is m; the unit of D is denier; the unit of d1 is m; the unit of d2 is m; and the other parameters are all eliminateable intermediate variables.

[0178] Example 1

[0179] The method for continuous and stable winding using the aforementioned continuous and stable winding device comprises the following steps:

[0180] (1) The fibers to be spun and the spun-up device;

[0181] Bundled fiber: pitch fiber, tensile strength 20MPa, elongation at break 0.3%, fineness D 20 denier, monofilament diameter d1 2×10 -5 m; Bundled fibers are obtained by melt spinning. The viscosity η of the melt spinning raw material is 50 Pa·s, and the distance dx that the monofilament moves from the molten state to the stable solidified state during melt spinning is 0.002 m.

[0182] Take-up device: It is a continuous and stable take-up device, wherein the length x1 of the take-up drum is 0.3m, the diameter d2 of the take-up drum is 0.16m, the rotation speed v1 of the take-up drum is set to 2400r / min, and the arrangement pitch x2 of the bundled fibers on the take-up drum is set to 0.01m.

[0183] (2) such as Figures 3-5 As shown, first input the parameters of the bundled fiber and spinning conditions into the physical button bar, as shown below. Figure 5 , Figure 6 The fiber parameter page and spinning condition page are shown. Then, the microcomputer finds W and N that satisfy the following relationship, and displays the number of drape lines N and the corresponding spacing W of the fixing rod and adjusting rod on the parameter display screen; where N is 1, the relationship to be satisfied is as follows:

[0184] 0 < δ1 - δ2 < 10%δ T ;

[0185] ;

[0186] ;

[0187] ;

[0188] ;

[0189] ;

[0190] ;

[0191] ;

[0192] ;

[0193] ;

[0194] In the formula, η is in Pa·s; dx is in meters; and g is the acceleration due to gravity, which is 9.8 m / s². 2The unit of W is m; N is a positive integer with no unit; the unit of x1 is m; the unit of v1 is r / min; the unit of x2 is m; the unit of H is m; the unit of D is denier; the unit of d1 is m; the unit of d2 is m; all other parameters are eliminateable intermediate variables.

[0195] As can be seen from the above, such as Figure 6 The parameter display shows the result "1-2.4m" (i.e., N is 1, W is 2.4m), and its δ1, δ2, δ T As W changes, Figure 8 As shown;

[0196] (3) According to the results shown in step (2), adjust the distance W between the fixed rod and the adjusting rod to 2.4m by cranking the handle. Then, according to the number of suspension lines N, install one guide wheel on the fixed rod and one guide wheel on the adjusting rod. Adjust the fork and take-up drum to be located below the adjusting rod, and the vertical distance H between the lowest guide wheel on the adjusting rod and the fork is 1m.

[0197] The bundled fibers are wound between the guide rollers, then passed through the take-up fork of the take-up device, and finally wound onto the take-up spool. During the take-up process, the fork is controlled to drive the bundled fibers to reciprocate between the center and the edge of the take-up spool, while the take-up spool is simultaneously controlled to rotate around its own central axis.

[0198] During the take-up process, the fiber bundle speed at the guide wheel directly above the take-up drum is v (m / s): The relationship between the fiber bundle speed and time at the guide wheel directly above the take-up drum during the take-up process is as follows: Figure 7 As shown, the fork drives the fiber bundle to reciprocate left and right, causing a periodic and rapid change in the linear velocity of the bundled fibers, which in turn causes a periodic and rapid change in the tensile force on the bundled fibers. Since this device adjusts the tensile force by the weight of the suspended fibers, the tension value displayed on the parameter screen during the winding process shows that the tension fluctuation does not exceed 10% of the average value, meeting the requirements for continuous winding.

[0199] As can be seen from the above, the continuous and stable winding time of bundled fibers (i.e., the time from the start of winding to the first occurrence of fiber breakage) is 20 minutes, the standard deviation of the fiber monofilament diameter measured on the winding bobbin is as low as 5, and the diameter uniformity is greatly improved.

[0200] Comparative Example 1

[0201] The method for continuous and stable winding using the above-mentioned continuous and stable winding device is basically the same as in Example 1, except that the spacing W is 1m.

[0202] As can be seen from the above, the continuous and stable winding time of the bundled fiber is 3 minutes, the standard deviation of the diameter of the fiber monofilament on the winding bobbin is 17, and the diameter uniformity rate decreases.

[0203] Comparing Comparative Example 1 and Example 1, it can be seen that the diameter distribution dispersion of the pitch fibers obtained in this comparative example is increased, and the spinning time is shortened. This is because the distance W between the fixed rod and the adjusting rod in this comparative example is too small. When the bundled fibers move left and right with the fork, for the same... The increased variation in the dangling fiber between the guide rollers, i.e. the increased variation in the stretching force on the bundled fiber, makes it easier for fiber breakage to occur during the winding process, reducing the continuous winding time and thus affecting the fiber output stability at the spinneret, which in turn affects the uniformity of the fiber diameter.

[0204] Example 2

[0205] The method for continuous and stable winding using the aforementioned continuous and stable winding device comprises the following steps:

[0206] (1) The fibers to be spun and the spun-up device;

[0207] Bundled fiber: pitch fiber, tensile strength 20MPa, elongation at break 0.3%, fineness D 20 denier, monofilament diameter d1 2×10 -5 m; Bundled fibers are obtained by melt spinning. The viscosity η of the melt spinning raw material is 50 Pa·s, and the distance dx that the monofilament moves from the molten state to the stable solidified state during melt spinning is 0.002 m.

[0208] Take-up device: It is a continuous and stable take-up device, wherein the length x1 of the take-up drum is 0.3m, the diameter d2 of the take-up drum is 0.16m, the rotation speed v1 of the take-up drum is set to 2400r / min, and the arrangement pitch x2 of the bundled fibers on the take-up drum is set to 0.01m.

[0209] (2) First, input the parameters of bundled fiber and spinning conditions into the fiber parameter page and spinning condition page through the physical button bar. Then, use the microcomputer to find W and N that satisfy the following relationship, and display the number of drooping lines N and the corresponding spacing W of the fixing rod and adjusting rod on the parameter display screen; where N is 2, the relationship that needs to be satisfied is as follows:

[0210] 0 < δ1 - δ2 < 10%δ T ;

[0211] ;

[0212] ;

[0213] ;

[0214] ;

[0215] ;

[0216] ;

[0217] ;

[0218] ;

[0219] ;

[0220] In the formula, η is in Pa·s; dx is in meters; and g is the acceleration due to gravity, which is 9.8 m / s². 2 The unit of W is m; N is a positive integer with no unit; the unit of x1 is m; the unit of v1 is r / min; the unit of x2 is m; the unit of H is m; the unit of D is denier; the unit of d1 is m; the unit of d2 is m; all other parameters are eliminateable intermediate variables.

[0221] As can be seen from the above, the result displayed on the parameter display screen is "2-1.5m", and its δ1, δ2, δ T As W changes, Figure 9 As shown;

[0222] (3) According to the results shown in step (2), adjust the distance W between the fixed rod and the adjusting rod to 1.5m by cranking the handle. Then, according to the number of hanging lines N, install two guide wheels on the fixed rod and one guide wheel on the adjusting rod. Adjust the fork and take-up drum to be located below the fixed rod, and the vertical distance H between the lowest guide wheel on the fixed rod and the fork is 1m.

[0223] The bundled fibers are wound between the guide rollers, then passed through the take-up fork of the take-up device, and finally wound onto the take-up drum. During the take-up process, the fork is controlled to drive the bundled fibers to reciprocate between the center and the edge of the take-up drum, while the take-up drum is simultaneously controlled to rotate around its own central axis. During the take-up process, the tension value of the single roller can be seen from the parameter display screen. The displayed tension fluctuation does not exceed 10% of the average value, which meets the requirements for continuous take-up.

[0224] As can be seen from the above, the continuous and stable winding time of bundled fibers (i.e., the time from the start of winding to the first occurrence of fiber breakage) is 17 minutes, the standard deviation of the fiber monofilament diameter measured on the winding bobbin is as low as 7, and the diameter uniformity is greatly improved.

[0225] Example 3

[0226] The method for continuous and stable winding using the aforementioned continuous and stable winding device comprises the following steps:

[0227] (1) The fibers to be spun and the spun-up device;

[0228] Bundled fiber: pitch fiber, tensile strength 20MPa, elongation at break 0.3%, fineness D 20 denier, monofilament diameter d1 2×10 -5 m; Bundled fibers are obtained by melt spinning. The viscosity η of the melt spinning raw material is 50 Pa·s, and the distance dx that the monofilament moves from the molten state to the stable solidified state during melt spinning is 0.002 m.

[0229] Take-up device: It is a continuous and stable take-up device, wherein the length x1 of the take-up drum is 0.3m, the diameter d2 of the take-up drum is 0.16m, the rotation speed v1 of the take-up drum is set to 2400r / min, and the arrangement pitch x2 of the bundled fibers on the take-up drum is set to 0.01m.

[0230] (2) First, input the parameters of bundled fiber and spinning conditions into the fiber parameter page and spinning condition page through the physical button bar. Then, use the microcomputer to find W and N that satisfy the following relationship, and display the number of drooping lines N and the corresponding spacing W of the fixing rod and adjusting rod on the parameter display screen; where N is 3, the relationship that needs to be satisfied is as follows:

[0231] 0 < δ1 - δ2 < 10%δ T ;

[0232] ;

[0233] ;

[0234] ;

[0235] ;

[0236] ;

[0237] ;

[0238] ;

[0239] ;

[0240] ;

[0241] In the formula, η is in Pa·s; dx is in meters; and g is the acceleration due to gravity, which is 9.8 m / s². 2The unit of W is m; N is a positive integer with no unit; the unit of x1 is m; the unit of v1 is r / min; the unit of x2 is m; the unit of H is m; the unit of D is denier; the unit of d1 is m; the unit of d2 is m; all other parameters are eliminateable intermediate variables.

[0242] As can be seen from the above, the result displayed on the parameter display screen is "3-1.14m", and its δ1, δ2, δ T As W changes, Figure 10 As shown;

[0243] (3) Based on the results shown in step (2), adjust the distance W between the fixed rod and the adjusting rod to 1.14m by cranking the handle. Then, based on the number of hanging lines N, install two guide wheels on the fixed rod and two guide wheels on the adjusting rod. Adjust the fork and take-up drum to be located below the fixed rod, and the vertical distance H between the lowest guide wheel on the fixed rod and the fork is 1m.

[0244] The bundled fibers are wound between the guide rollers, then passed through the take-up fork of the take-up device, and finally wound onto the take-up drum. During the take-up process, the fork is controlled to drive the bundled fibers to reciprocate between the center and the edge of the take-up drum, while the take-up drum is simultaneously controlled to rotate around its own central axis. During the take-up process, the tension value of the single roller can be seen from the parameter display screen. The displayed tension fluctuation does not exceed 10% of the average value, which meets the requirements for continuous take-up.

[0245] As can be seen from the above, the continuous and stable winding time of bundled fibers (i.e., the time from the start of winding to the first occurrence of fiber breakage) is 15 minutes, the standard deviation of the fiber monofilament diameter measured on the winding bobbin is as low as 7, and the diameter uniformity is greatly improved.

Claims

1. A method for continuous and stable wire take-up, implemented using a device for continuous and stable wire take-up, the device comprising a fixed rod (331), an adjusting rod (332), a fork (410), a take-up drum (420), and a human-computer interaction computer (500). The fixed rod (331) and the adjusting rod (332) are arranged vertically with left and right spacing, and the fixed rod (331) is located to the right of the adjusting rod (332); The shift fork (410) and the take-up spool (420) are located below X, which is the adjusting rod (332) or the fixed rod (331). The shift fork (410) is located above the take-up spool (420), and the length direction of the take-up spool (420) is parallel to the left and right direction. At least one guide wheel (321) is installed on both the fixed rod (331) and the adjusting rod (332), and the central axis of the guide wheel (321) is parallel to the front-back direction; The human-computer interaction computer (500) includes a physical button bar (510), a microcomputer (530), and a parameter display screen (520). The physical button bar (510) is used to input parameters, including the length x1 of the take-up spool (420), the rotational speed v1 of the take-up spool (420), the pitch x2 of the bundled fibers on the take-up spool, the vertical distance H between the lowest guide wheel (321) on X and the fork (410), the fineness D of the bundled fibers, the diameter d1 of the monofilament, the diameter d2 of the take-up spool (420), the viscosity η of the melt spinning raw material, and the distance dx that the monofilament moves from the molten state to the stable solid state during melt spinning. A microcomputer (530) is used to find W and N that satisfy the following relation and display them on a parameter display screen (520); Its features are, The bundled fibers are wound between each guide wheel (321) to form N suspension lines between the fixed rod (331) and the adjusting rod (332). Then, the control fork (410) drives the bundled fibers to reciprocate between the center of the take-up drum (420) and the edge of the take-up drum (420), and simultaneously controls the take-up drum (420) to rotate around its own central axis. The suspension effect generated by the weight of the bundled fibers is used to balance the change in the linear velocity of the bundled fibers caused by the reciprocating motion of the control fork, thereby maintaining the uniform tension on the bundled fibers. The bundled fibers are obtained by melt spinning. The distance between the fixed rod (331) and the adjusting rod (332) is W; W and N satisfy the following relationship: 0<δ1-δ2<10%δ T ; ； ； ； ； ； ； ； ； ； In the formula, the unit of η is Pa·s; The unit of dx is meters (m). g is the acceleration due to gravity, with a value of 9.8 m / s². 2 ; The unit of W is meters (m); N is a positive integer with no unit. The unit of x1 is m; The unit of v1 is r / min; The unit of x2 is m; The unit of H is m; The unit of D is denier; The unit of d1 is meters; The unit of d2 is meters; δT is the tensile force on the bundled fibers at the highest point of the suspension line when the fork does not drive the bundled fibers to move along the take-up drum, and the unit is MPa; δ1 is the tensile force on the bundled fibers at the highest point of the suspension line when the fork drives the bundled fibers to the edge of the take-up drum, and the unit is MPa; δ2 is the tensile force on the bundled fibers at the highest point of the suspension line when the fork drives the bundled fibers to the center of the take-up drum; the unit is MPa. a is a shape factor that characterizes the morphological features of the suspension line when the fork does not drive the bundled fibers to move along the take-up drum; a1 is a shape factor that characterizes the morphological features of the suspension line when the fork drives the bundled fibers to the edge of the take-up cylinder. a2 is a shape factor that characterizes the morphological features of the suspension line when the fork drives the bundled fibers to the center of the take-up drum; ρ is the bulk density of a single filament, in kg / m³. -3 .

2. The method for continuous and stable yarn take-up according to claim 1, characterized in that, At least one guide roller (321) is equipped with a single roller tension sensor (325); the base material of each guide roller (321) is polyetheretherketone, and the surface is treated with ceramic coating; the groove is U-shaped; the outer diameter of the roller is 100mm and the inner diameter of the roller is 80mm; the roller body has a pre-set microporous channel and is connected to the external lubrication pipeline.

3. The method for continuous and stable yarn take-up according to claim 1, characterized in that, The distance W between the fixed rod (331) and the adjusting rod (332) is 0.2-3m. The horizontal distance between the lowest guide wheel (321) on X and the center of the take-up drum (420) in the left-right direction is 0. The vertical distance H between the lowest guide wheel (321) on X and the shift fork (410) is 0.5-2m. The length x1 of the take-up drum (420) is 0.3m.

4. The method for continuous and stable yarn take-up according to claim 1, characterized in that, It also includes a bracket (310), an upper rack, an upper gear, a lower rack, a lower gear, and a crank handle (333); a fixed rod (331) is fixedly connected to the bracket (310); the upper rack and the lower rack are parallel to the left and right directions, and their support surfaces are fixedly connected to the bracket (310); the upper gear and the lower gear are respectively fixedly sleeved on the upper and lower ends of the adjusting rod (332), the upper gear meshes with the upper rack, and the lower gear meshes with the lower rack; the crank handle (333) is fixedly connected to the upper end of the adjusting rod (332) and is used to drive the adjusting rod (332) to rotate around its own central axis.

5. The method for continuous and stable yarn take-up according to claim 1, characterized in that, It also includes a first constant speed roller (120) and a second constant speed roller (130) located to the upper right of the fixed rod (331). The first constant speed roller (120) is located to the lower right of the second constant speed roller (130). The vertical distance between the second constant speed roller (130) and the highest guide wheel (321) on the fixed rod (331) is 0.5-3m, and the horizontal distance along the left and right direction is 0.

6. The method for continuous and stable yarn take-up according to claim 1, characterized in that, The tensile strength of the bundled fibers is less than 30 MPa, and the elongation at break is less than 0.5%.

7. The method for continuous and stable yarn take-up according to claim 1, characterized in that, The continuous and stable winding time of bundled fibers is 15-20 minutes. The continuous and stable winding time is the time from the start of winding to the first occurrence of fiber breakage.

Images