CN104762713B - The three component similarities and differences walk the method and device of drawing-off regulation and control yarn linear density and blending ratio - Google Patents

The three component similarities and differences walk the method and device of drawing-off regulation and control yarn linear density and blending ratio Download PDF

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CN104762713B
CN104762713B CN201510140466.6A CN201510140466A CN104762713B CN 104762713 B CN104762713 B CN 104762713B CN 201510140466 A CN201510140466 A CN 201510140466A CN 104762713 B CN104762713 B CN 104762713B
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yarn
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back roller
linear density
blending ratio
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CN104762713A (en
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薛元
王鸿博
周建
郭明瑞
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Jiangnan University
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Abstract

本发明公开了一种三组份异同步牵伸调控纱线线密度及混纺比的方法,其具体包括牵伸和加捻系统包括前后设置的一级牵伸单元和二级牵伸单元;一级牵伸单元包括组合后罗拉、中罗拉;二级牵伸单元包括前罗拉和所述中罗拉;在基准线段的基准线速度基础上,增减组合后罗拉上的第一后罗拉、第二后罗拉和/或第三后罗拉的转速,实现第i段纱线Y的线密度或/和混纺比的在线动态调整。利用本发明的方法及装置生产出来的点点纱、竹节纱、大肚纱混色更加均匀和准确,通过控制中罗列的恒定的设定速度转动,保证了混纺效果更加稳定,即使不同批次的纱线色差也不会有明显的变化。

The invention discloses a method for regulating yarn linear density and blending ratio by three-component synchronous drafting, which specifically includes a drafting and twisting system including a first-stage drafting unit and a second-stage drafting unit arranged before and after; The drafting unit includes the combined rear roller and the middle roller; the secondary drafting unit includes the front roller and the middle roller; on the basis of the reference line speed of the reference line segment, increase or decrease the first rear roller and the second rear roller on the combined rear roller. Roller and/or the rotational speed of the third back roller, realize the online dynamic adjustment of the linear density or/and blending ratio of the i-th yarn Y. The dotted yarn, slub yarn, and belly yarn produced by the method and device of the present invention are more uniform and accurate in color mixing, and the constant setting speed rotation listed in the control ensures that the blending effect is more stable, even if different batches There will be no obvious change in yarn color difference.

Description

三组份异同步牵伸调控纱线线密度及混纺比的方法及装置Method and device for regulating yarn linear density and blending ratio by three-component synchronous drafting

技术领域technical field

本发明涉及到纺织工程中纺纱领域,特别涉及一种三组份异同步二级牵伸调控纱线线密度及混纺比的方法及装置。The invention relates to the field of spinning in textile engineering, in particular to a method and device for regulating yarn linear density and blending ratio by three-component synchronous two-stage drafting.

背景技术Background technique

纱线是由纤维平行取向经加捻形成的细长的纤维集合体。当纤维不均匀分布在纱线长度方向时,其线密度(或外观)就会在基准线密度(基准粗细度)的基础上增加一个动态线密度(动态粗细度),从而导致纱线的线密度(或粗细)发生变化。根据这种不均匀分布程度的大小可分类为竹节纱、点点纱等,或统称为线密度变化的花式纱线。如果在纱线线密度变化的同时还能改变其混纺比,就可以形成线密度和色彩均变化的花式纱线,我们把这种类型的纱线定义为多彩变密度纱线,具体可分为多彩竹节纱、多彩点点纱等。Yarn is an elongated fiber assembly formed by twisting fibers in parallel orientation. When the fibers are not evenly distributed in the length direction of the yarn, its linear density (or appearance) will increase a dynamic linear density (dynamic thickness) on the basis of the reference linear density (reference thickness), resulting in the yarn line Density (or thickness) changes. According to the size of this uneven distribution, it can be classified into slub yarn, dot yarn, etc., or collectively referred to as fancy yarn with linear density change. If the blending ratio can be changed while the linear density of the yarn is changed, fancy yarns with variable linear density and color can be formed. We define this type of yarn as colorful variable density yarn, which can be divided into It is colorful slub yarn, colorful dot yarn, etc.

目前环锭纺生产变线密度纱线的方法,基本采用中、后罗拉分别喂入一根粗纱须条,通过后罗拉不均匀的喂入进行断续式纺纱来生产变线密度纱线。如专利“一种断续纺工艺及其纱线”(授权号ZL01126398.9),它的原理是把由后罗拉喂入的一根辅纱须条B,经中、后罗拉不均匀牵伸,再与另一根由中罗拉后点喂入的主纱须条A交汇再进入前牵伸区,经前、中罗拉牵伸后由前钳口输出,进入加捻区共同加捻形成纱线。由于辅纱是由后罗拉间隙式喂入与主纱汇合,在前区主牵伸倍数的作用下,主纱须条被均匀地拉细至一定的线密度,辅纱须条则依附在主纱须条上形成断续式不均匀的线密度分布。控制后罗拉不均匀喂入辅纱波动量的大小,就可以最终在纱线上形成竹节、点点等不同效果。At present, the method for producing variable linear density yarn by ring spinning basically uses the middle and rear rollers to feed a roving sliver respectively, and performs intermittent spinning through the uneven feeding of the rear roller to produce variable linear density yarn. For example, the patent "A Discontinuous Spinning Process and Its Yarn" (Authorization No. ZL01126398.9), its principle is that an auxiliary yarn sliver B fed by the rear roller is unevenly drawn by the middle and rear rollers , and then intersect with another main yarn strand A fed from the rear point of the middle roller, and then enter the front drafting area, after being drafted by the front and middle rollers, it is output from the front nip, and enters the twisting area to be twisted together to form a yarn . Since the auxiliary yarn is fed into the main yarn by the gap feeding of the back roller, under the action of the main draft multiple in the front area, the main yarn is evenly drawn to a certain linear density, and the auxiliary yarn is attached to the main yarn. Intermittent uneven linear density distribution is formed on the yarn whiskers. By controlling the amount of fluctuation in the uneven feeding of the auxiliary yarn by the rear roller, different effects such as slubs and dots can be formed on the yarn.

现有技术中的变线密度纱线的纺纱工艺,有以下几个局限性:The spinning process of the variable linear density yarn in the prior art has the following limitations:

①采用两种不同原料(或不同颜色)粗纱作为主辅纱须条时,无法随机在线调整纱线的混纺比(混色比);不能在调整纱线粗细变化的同时调整混纺比(混色比)的变化。① When two different raw materials (or different colors) of roving are used as the main and auxiliary yarn strands, the blending ratio (color mixing ratio) of the yarn cannot be adjusted randomly online; the blending ratio (color mixing ratio) cannot be adjusted while adjusting the thickness of the yarn The change.

②纺纱过程中主、辅纱不能交换(主纱须条是纱线中连续分布的须条、辅纱须条是纱线中离散分布的须条),由此导致纺纱纱线花型单调,可变因素少。② During the spinning process, the main and auxiliary yarns cannot be exchanged (the main yarn whiskers are continuously distributed in the yarn, and the auxiliary yarn whiskers are discretely distributed in the yarn), resulting in spinning yarn pattern Monotonous, with few variables.

③花型的可再现性差。现有的改变纱线线密度的成纱方法,最终形成的竹节(粗细节)形状、点点的形状与纺纱机主轴速度有关。主轴速度不同形成的竹节(粗细节)形状、点点的形状及色彩会出现差异。③ The reproducibility of the pattern is poor. In the existing yarn forming method of changing the linear density of the yarn, the finally formed slub (thick and fine details) shape and the shape of the dots are related to the spindle speed of the spinning machine. The shapes of the bamboo joints (coarse details), the shape and color of the dots formed by different spindle speeds will be different.

发明内容Contents of the invention

为解决上述问题,本发明的目的在于提供一种三组份异同步牵伸调控纱线线密度及混纺比的在线动态调控,以此纺制多彩竹节纱和多彩点点纱的方法。该方法将传统的三组份前后区同步牵伸改变为三组份分离异步牵伸(下称一级异步牵伸)和三组份并合同步牵伸(下称二级同步牵伸),通过一级异步牵伸控制三组份混合比例及纱线线密度的动态变化,通过二级同步牵伸控制纱线的当量线密度(或基准线密度)的大小。通过本发明的三组份分合异同步式二级牵伸再汇合加捻成纱的纺纱装置及工艺,可实现随机在线动态调控纺纱线线密度及混纺比的变化,突破原有竹节纱和点点纱纺制过程中的三大技术瓶颈:①只能调节纱线线密度不能调节其混纺比(或色彩变化);②纱线花型单一;③花型的可再现性差。In order to solve the above problems, the object of the present invention is to provide a method for spinning multicolored slub yarns and multicolored dotted yarns through online dynamic regulation of yarn density and blending ratio controlled by three-component synchronous drafting. This method changes the traditional synchronous drafting of the front and rear areas of three components into three-component separated asynchronous drafting (hereinafter referred to as primary asynchronous drafting) and three-component combined synchronous drafting (hereinafter referred to as secondary synchronous drafting), The mixing ratio of the three components and the dynamic change of the yarn linear density are controlled by one-stage asynchronous drafting, and the equivalent linear density (or reference linear density) of the yarn is controlled by two-stage synchronous drafting. Through the spinning device and process of three-component separation and synchronous two-stage drafting of the present invention, recombination and twisting into yarn, random on-line dynamic control of the change of spinning linear density and blending ratio can be realized, breaking through the original bamboo There are three technical bottlenecks in the process of knuckle yarn and dot yarn spinning: ① only the yarn density can be adjusted but not its blending ratio (or color change); ② the yarn pattern is single; ③ the pattern reproducibility is poor.

为实现上述目的,本发明公开的一种三组份异同步牵伸调控纱线线密度及混纺比的方法具体包括:In order to achieve the above purpose, a method for regulating yarn linear density and blending ratio by three-component synchronous drafting disclosed by the present invention specifically includes:

1)牵伸和加捻系统包括前后设置的一级牵伸单元和二级牵伸单元;1) The drafting and twisting system includes a primary drafting unit and a secondary drafting unit arranged in front and rear;

2)所述一级牵伸单元包括组合后罗拉、中罗拉;组合后罗拉具有三个转动自由度,其包括同一根后罗拉轴上并排设置的第一后罗拉、第二后罗拉和第三后罗拉;第一后罗拉、第二后罗拉和第三后罗拉分别以速度Vh1、Vh2和Vh3运动;中罗拉以速度Vz的速度转动;所述二级同步牵伸单元包括前罗拉和所述中罗拉;前罗拉以表面线速度Vq转动;2) The primary drafting unit includes a combined rear roller and a middle roller; the combined rear roller has three rotational degrees of freedom, and it includes the first rear roller, the second rear roller and the third rear roller arranged side by side on the same rear roller shaft. Rear rollers; the first rear roller, the second rear roller and the third rear roller move at speeds V h1 , V h2 and V h3 respectively; the middle roller rotates at a speed of V z ; the secondary synchronous drafting unit includes the front Roller and described middle roller; Front roller rotates with surface linear velocity V q ;

设第一后罗拉、第二后罗拉和第三后罗拉所牵伸的第一组份粗纱、第二组份粗纱和第三组份粗纱的线密度分别为ρ1、ρ2和ρ3,前罗拉牵伸加捻后得到的纱线Y的线密度为ρySuppose the linear densities of the first component roving, the second component roving and the third component roving drafted by the first back roller, the second back roller and the third back roller are ρ 1 , ρ 2 and ρ 3 respectively, The linear density of the yarn Y obtained after drafting and twisting by the front roller is ρ y ,

3)根据设定混纺比和/或线密度,将所述纱线Y分为n段,每段纱线Y的线密度和混纺比相同,而相邻两段的线密度或混纺比不同;牵伸第i段纱线Y时,第一后罗拉、第二后罗拉和第三后罗拉的线速度分别为Vh1i、Vh2i和Vh3i,其中i∈(1,2,…,n);3) According to the set blending ratio and/or linear density, the yarn Y is divided into n sections, the linear density and blending ratio of each section of yarn Y are the same, but the linear densities or blending ratios of two adjacent sections are different; When drafting the i-th yarn Y, the linear speeds of the first back roller, the second back roller and the third back roller are V h1i , V h2i and V h3i respectively , where i∈(1,2,…,n) ;

所述第一组份粗纱、第二组份粗纱和第三组份粗纱经两级牵伸和加捻形成的第i段纱线Y后,其混纺比k1i、k2i和k3i可表达如下:After the first component roving, the second component roving and the third component roving are drawn and twisted to form the i-th segment yarn Y, the blending ratios k 1i , k 2i and k 3i can be expressed as follows :

第i段纱线Y的线密度为:The linear density of the i-th segment yarn Y is:

其中,为二级牵伸比;in, is the secondary draft ratio;

4)设将n段纱线Y中线密度最小的一段定义为基准线段,该段的基准线密度为ρ0,以及该段的第一后罗拉、第二后罗拉和第三后罗拉的基准线速度分别为Vh10、Vh20和Vh30;该段的第一组份粗纱、第二组份粗纱和第三组份粗纱的基准混纺比分别为k10、k20和k30 4) Assuming that the segment with the smallest linear density among the n segments of yarn Y is defined as the reference line segment, the reference linear density of this segment is ρ 0 , and the reference lines of the first rear roller, the second rear roller and the third rear roller of this segment The speeds are V h10 , V h20 and V h30 ; the benchmark blending ratios of the first component roving, the second component roving and the third component roving in this section are k 10 , k 20 and k 30 respectively

保持所述中罗拉的线速度恒定,Keep the linear speed of the middle roller constant,

且Vz=Vh10+Vh20+Vh30 (6);And V z =V h10 +V h20 +V h30 (6);

同时,令二级牵伸比恒定;At the same time, let the secondary draft ratio constant;

其中,第一后罗拉、第二后罗拉和第三后罗拉的基准线速度Vh10、Vh20和Vh30根据第一组份粗纱、第二组份粗纱和第三组份粗纱的材质、基准线密度ρ0以及基准混纺比k10、k20和k30提前设定;Among them, the reference line speeds V h10 , V h20 and V h30 of the first back roller, the second back roller and the third back roller are based on the material and benchmark of the first component roving, the second component roving and the third component roving The linear density ρ 0 and the benchmark blending ratios k 10 , k 20 and k 30 are set in advance;

5)牵伸混纺第i段纱线Y时,在已知第i段的设定线密度ρyi和设定混纺比k1i、k2i和k3i前提下,根据公式(2)-(6)计算出所述第一后罗拉、第二后罗拉和第三后罗拉的线速度Vh1i、Vh2i和Vh3i5) When drafting and blending the yarn Y of the i-th segment, under the premise of knowing the set linear density ρ yi of the i-th segment and the set blending ratios k 1i , k 2i and k 3i , according to formulas (2)-(6 ) Calculate the linear speeds V h1i , V h2i and V h3i of the first rear roller, the second rear roller and the third rear roller;

6)在基准线段的基准线速度Vh10、Vh20和Vh30基础上,增减第一后罗拉、第二后罗拉和/或第三后罗拉的转速,实现第i段纱线Y的线密度或/和混纺比的在线动态调整。6) On the basis of the reference line speeds V h10 , V h20 and V h30 of the reference line segment, increase or decrease the rotational speed of the first rear roller, the second rear roller and/or the third rear roller to realize the line speed of the i-th segment yarn Y. Online dynamic adjustment of density or/and blending ratio.

进一步,设ρ1=ρ2=ρ3=ρ,则公式(5)简化为:Further, assuming ρ 123 =ρ, the formula (5) is simplified as:

根据公式(2)-(4)和(6)-(7)计算出所述第一后罗拉、第二后罗拉和第三后罗拉的线速度Vh1i、Vh2i和Vh3i;在基准线速度Vh10、Vh20和Vh30的基础上,增减第一后罗拉、第二后罗拉和/或第三后罗拉的转速实现设定的第i段纱线Y线密度或/和混纺比。According to formula (2)-(4) and (6)-(7), calculate the linear velocity V h1i , V h2i and V h3i of described first back roller, second back roller and the 3rd back roller; On the basis of speeds V h10 , V h20 and V h30 , increase or decrease the speed of the first back roller, the second back roller and/or the third back roller to achieve the set i-th section yarn Y linear density or/and blending ratio .

进一步,在纱线Y从第i-1段转换到第i段的瞬间,设纱线Y的线密度在基准线密度的基础上增加动态增量Δρyi,即粗细变化Δρyi;为此所述第一后罗拉、第二后罗拉和第三后罗拉的线速度分别在基准线速度的基础上发生相应增量,即(Vh10+Vh20+Vh30)→(Vh10+ΔVh1i+Vh20+ΔVh2i+Vh30+ΔVh3i)时,纱线Y线密度的增量为:Further, at the moment when the yarn Y is converted from the i-1 segment to the i segment, the linear density of the yarn Y is set to increase the dynamic increment Δρ yi on the basis of the reference linear density, that is, the thickness change Δρ yi ; The linear speeds of the first rear roller, the second rear roller and the third rear roller respectively increase correspondingly on the basis of the reference linear speed, namely (V h10 +V h20 +V h30 )→(V h10 +ΔV h1i + When V h20 +ΔV h2i +V h30 +ΔV h3i ), the increment of yarn Y linear density is:

则纱线Y的线密度ρyi可表达如下:Then the linear density ρyi of the yarn Y can be expressed as follows:

令ΔVi=ΔVh1i+ΔVh2i+ΔVh3i,则(8)变为:Let ΔV i = ΔV h1i + ΔV h2i + ΔV h3i , then (8) becomes:

通过控制所述第一后罗拉、第二后罗拉和第三后罗拉的线速度增量之和ΔVi实现纱线Y的线密度变化。The linear density change of the yarn Y is realized by controlling the sum ΔV i of the linear speed increments of the first rear roller, the second rear roller and the third rear roller.

进一步,令ρ1=ρ2=ρ3=ρ,则在纱线Y从第i-1段转换到第i段的瞬间,纱线Y的混纺比,即公式(2)-(4)简化为:Further, let ρ 123 =ρ, then at the moment when yarn Y switches from the i-1th segment to the i-th segment, the blending ratio of the yarn Y, that is, formulas (2)-(4) simplify for:

通过控制所述第一后罗拉、第二后罗拉和第三后罗拉的线速度增量实现纱线Y的混纺比的调整;The adjustment of the blending ratio of the yarn Y is realized by controlling the line speed increment of the first back roller, the second back roller and the third back roller;

其中,in,

ΔVh1i=k1i*(Vz+ΔVi)-Vh10 ΔV h1i =k 1i *(V z +ΔV i )-V h10

ΔVh2i=k2i*(Vz+ΔVi)-Vh20 ΔV h2i =k 2i *(V z +ΔV i )-V h20

ΔVh3i=k3i*(Vz+ΔVi)-Vh30ΔV h3i =k 3i *(V z +ΔV i )−V h30 .

进一步,令Vh1i1+Vh2i2+Vh3i3=H,H为常数,则ΔVi恒为0,由此,实现所述纱线Y的混纺比调整的同时保证线密度不变。Further, let V h1i1 +V h2i2 +V h3i3 =H, and H is a constant, then ΔV i is always 0, thereby realizing the adjustment of the blending ratio of the yarn Y while ensuring The linear density does not change.

进一步,令ΔVh1i、ΔVh2i和ΔVh3i其中一个或两个为零,其他不为零,则实现所述纱线Y中一种或两种粗纱组份的变化,而其他粗纱组份不变化,调整后的混纺比为:Further, if one or two of ΔV h1i , ΔV h2i and ΔV h3i are zero, and the others are not zero, then the change of one or two roving components in the yarn Y is realized, while the other roving components do not change , the adjusted blending ratio is:

其中,k,j∈(1,2,3),且k≠j。Among them, k, j∈(1, 2, 3), and k≠j.

进一步,令ΔVh1i、ΔVh2i和ΔVh3i都不为零,则实现所述纱线Y中三种粗纱组份的变化。Further, if ΔV h1i , ΔV h2i and ΔV h3i are not zero, the three roving components in the yarn Y can be varied.

进一步,令Vh1i、Vh2i和Vh3i其中一个或两个为零,而其它不为零,则实现在第i段纱线Y中一种或两种粗纱组份的不连续。Further, if one or two of V h1i , V h2i and V h3i are zero, and the others are not zero, then the discontinuity of one or two roving components in the i-th segment yarn Y is realized.

一种三组份异同步牵伸调控纱线线密度及混纺比的装置包括控制系统和执行机构,执行机构包括三组份分合式异同步二级牵伸机构、加捻机构和卷绕成型机构;所述二级牵伸机构包括一级牵伸单元和二级牵伸单元;所述一级牵伸单元包括组合后罗拉、中罗拉;组合后罗拉具有三个转动自由度,包括同一根后罗拉轴上并排设置的第一后罗拉、第二后罗拉和第三后罗拉;所述二级牵伸单元包括前罗拉和所述中罗拉。A device for regulating yarn linear density and blending ratio by three-component synchronous drafting includes a control system and an actuator, and the actuator includes a three-component synchronous two-stage drafting mechanism, a twisting mechanism, and a winding forming mechanism. ; The secondary drafting mechanism includes a primary drafting unit and a secondary drafting unit; the primary drafting unit includes a combined rear roller and a middle roller; the combined rear roller has three rotational degrees of freedom, including the same rear The first rear roller, the second rear roller and the third rear roller arranged side by side on the roller shaft; the secondary drafting unit includes the front roller and the middle roller.

进一步,所述控制系统主要包括PLC可编程控制器、伺服驱动器、伺服电机等。Furthermore, the control system mainly includes a PLC programmable controller, a servo driver, a servo motor, and the like.

进一步,第一后罗拉、第二后罗拉和第三后罗拉中任一个固定设置在所述后罗拉轴上,其他两个后罗拉彼此独立转动地设置在所述后罗拉轴上。Further, any one of the first rear roller, the second rear roller and the third rear roller is fixedly arranged on the rear roller shaft, and the other two rear rollers are independently rotatably arranged on the rear roller shaft.

进一步,牵伸过程中,所述中罗拉的速度固定且不大于所述第一后罗拉、第二后罗拉和第三后罗拉的速度之和。Further, during the drafting process, the speed of the middle roller is fixed and not greater than the sum of the speeds of the first rear roller, the second rear roller and the third rear roller.

利用本发明的方法及装置生产出来的点点纱、竹节纱、混色更加均匀和准确,通过控制中罗列的恒定的设定速度转动,保证了混纺效果更加稳定,即使不同批次的纱线色差也不会有明显的变化。下表为本发明技术效果与现有技术的对比。The dotted yarn, slub yarn, and color mixing produced by the method and device of the present invention are more uniform and accurate, and through the constant set speed rotation listed in the control, the blending effect is guaranteed to be more stable, even if the yarn color of different batches is different There will be no noticeable change. The following table is a comparison between the technical effect of the present invention and the prior art.

由此可见本发明的技术效果显著。This shows that the technical effect of the present invention is remarkable.

附图说明Description of drawings

图1为二级牵伸纺纱装置的原理示意图;Fig. 1 is the schematic diagram of the principle of the secondary draft spinning device;

图2为组合后罗拉结构示意图;Fig. 2 is the schematic diagram of the structure of the combined back roller;

图3为二级牵伸纺纱装置的结构侧视图;Fig. 3 is a structural side view of the secondary draft spinning device;

图4为实施例中二级牵伸中纱线的行进路径图;Fig. 4 is the traveling path diagram of yarn in secondary drafting in the embodiment;

图5为控制系统结构示意图。Figure 5 is a schematic diagram of the structure of the control system.

具体实施方式Detailed ways

下面结合附图对本发明的具体实施方式进行说明。Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

如图1-5所示,一种三组份异同步牵伸调控纱线线密度及混纺比的方法具体包括:As shown in Figure 1-5, a method for regulating yarn linear density and blending ratio by three-component synchronous drafting specifically includes:

1)牵伸和加捻系统包括前后设置的一级牵伸单元和二级牵伸单元;1) The drafting and twisting system includes a primary drafting unit and a secondary drafting unit arranged in front and rear;

2)一级牵伸单元包括组合后罗拉11、中罗拉3;组合后罗拉11具有三个转动自由度,包括同一根后罗拉轴上并排设置的第一后罗拉5、第二后罗拉7和第三后罗拉9;二级牵伸单元包括前罗拉1和中罗拉3。4为中罗拉3对应的上皮辊,6、8、10为与三个后罗拉对应的三个上皮辊。2为与前罗拉1相对应的上皮辊。13和14分别为卷绕成型机构和导辊,15为纱线Y。2) The primary drafting unit includes a combined rear roller 11 and a middle roller 3; the combined rear roller 11 has three rotational degrees of freedom, including the first rear roller 5, the second rear roller 7 and the second rear roller arranged side by side on the same rear roller shaft. The third rear roller 9; the secondary drafting unit includes the front roller 1 and the middle roller 3. 4 is the top roller corresponding to the middle roller 3, and 6, 8, 10 are the three top rollers corresponding to the three rear rollers. 2 is the top roller corresponding to the front roller 1. 13 and 14 are winding forming mechanism and guide roller respectively, and 15 is yarn Y.

第一后罗拉、第二后罗拉和第三后罗拉分别以速度Vh1、Vh2和Vh3运动;中罗拉以速度Vz的速度转动;所述二级同步牵伸单元包括前罗拉和所述中罗拉;前罗拉以表面线速度Vq转动;The first rear roller, the second rear roller and the third rear roller move at speeds V h1 , V h2 and V h3 respectively; the middle roller rotates at a speed of V z ; the secondary synchronous drafting unit includes front rollers and all The middle roller; the front roller rotates at the surface speed V q ;

如图2所示,具有三重嵌套的3自由度组合后罗拉,5、7、9三个活动后罗拉活套在同一心轴上,并分别由皮带轮16、22、17驱动。As shown in Figure 2, there are 3 degrees of freedom combined back rollers with triple nesting, three movable back rollers 5, 7, and 9 are looped on the same mandrel, and are driven by pulleys 16, 22, 17 respectively.

图4为第一至三组份粗纱的行进路径图。三组份粗纱首先经过后组合罗拉的分离异步牵伸,再经中罗拉的同步牵伸,最后经过集合器在前罗拉混合形成纱线Y。一级异步牵伸能够准确控制双组份混合比例及纱线线密度的动态变化,而二级同步牵伸控制纱线的当量线密度(或基准线密度)的大小。两者结合使得混纺出的纱线更加均匀,断头率更低。Figure 4 is a diagram of the traveling path of the first to third component rovings. The three-component roving is first separated and asynchronously drafted by the rear combination roller, then synchronously drawn by the middle roller, and finally mixed by the collector to form the yarn Y on the front roller. The one-stage asynchronous drafting can accurately control the mixing ratio of the two components and the dynamic change of the yarn linear density, while the two-stage synchronous drafting controls the equivalent linear density (or reference linear density) of the yarn. The combination of the two makes the blended yarn more uniform and has a lower end-break rate.

如图5所示,控制系统主要包括PLC可编程控制器、伺服驱动器、伺服电机等。可编程控制器通过伺服驱动器控制电机带动罗拉、纲领板、锭子等工作。As shown in Figure 5, the control system mainly includes PLC programmable controller, servo driver, servo motor and so on. The programmable controller controls the motor through the servo driver to drive the rollers, the program plate, the spindle and so on.

第一后罗拉、第二后罗拉和第三后罗拉所牵伸的第一组份粗纱、第二组份粗纱和第三组份粗纱的线密度分别为ρ1、ρ2和ρ3,前罗拉牵伸加捻后得到的纱线Y的线密度为ρyThe linear densities of the first component roving, the second component roving and the third component roving drawn by the first rear roller, the second rear roller and the third rear roller are ρ 1 , ρ 2 and ρ 3 respectively, and the front The linear density of the yarn Y obtained after roller drafting and twisting is ρ y ,

3)根据设定混纺比和/或线密度,将所述纱线Y分为n段,每段纱线Y的线密度和混纺比相同,而相邻两段的线密度或混纺比不同;牵伸第i段纱线Y时,第一后罗拉、第二后罗拉和第三后罗拉的线速度分别为Vh1i、Vh2i和Vh3i,其中i∈(1,2,…,n);3) According to the set blending ratio and/or linear density, the yarn Y is divided into n sections, the linear density and blending ratio of each section of yarn Y are the same, but the linear densities or blending ratios of two adjacent sections are different; When drafting the i-th yarn Y, the linear speeds of the first back roller, the second back roller and the third back roller are V h1i , V h2i and V h3i respectively , where i∈(1,2,…,n) ;

第一组份粗纱、第二组份粗纱和第三组份粗纱经两级牵伸和加捻形成的第i段纱线Y后,其混纺比k1i、k2i和k3i可表达如下:After the first component roving, the second component roving and the third component roving are drawn and twisted to form the i-th section yarn Y, the blending ratio k 1i , k 2i and k 3i can be expressed as follows:

第i段纱线Y的线密度为:The linear density of the i-th segment yarn Y is:

其中,为二级牵伸比;in, is the secondary draft ratio;

4)设将n段纱线Y中线密度最小的一段定义为基准线段,该段的基准线密度为ρ0,以及该段的第一后罗拉、第二后罗拉和第三后罗拉的基准线速度分别为Vh10、Vh20和Vh30;该段的第一组份粗纱、第二组份粗纱和第三组份粗纱的基准混纺比分别为k10、k20和k30 4) Assuming that the segment with the smallest linear density among the n segments of yarn Y is defined as the reference line segment, the reference linear density of this segment is ρ 0 , and the reference lines of the first rear roller, the second rear roller and the third rear roller of this segment The speeds are V h10 , V h20 and V h30 ; the benchmark blending ratios of the first component roving, the second component roving and the third component roving in this section are k 10 , k 20 and k 30 respectively

保持所述中罗拉的线速度恒定,Keep the linear speed of the middle roller constant,

且Vz=Vh10+Vh20+Vh30 (6);And V z =V h10 +V h20 +V h30 (6);

同时,令二级牵伸比恒定;At the same time, let the secondary draft ratio constant;

其中,第一后罗拉、第二后罗拉和第三后罗拉的基准线速度Vh10、Vh20和Vh30根据第一组份粗纱、第二组份粗纱和第三组份粗纱的材质、基准线密度ρ0以及基准混纺比k10、k20和k30提前设定;Among them, the reference line speeds V h10 , V h20 and V h30 of the first back roller, the second back roller and the third back roller are based on the material and benchmark of the first component roving, the second component roving and the third component roving The linear density ρ 0 and the benchmark blending ratios k 10 , k 20 and k 30 are set in advance;

5)牵伸混纺第i段纱线Y时,在已知第i段的设定线密度ρyi和设定混纺比k1i、k2i和k3i前提下,根据公式(2)-(6)计算出所述第一后罗拉、第二后罗拉和第三后罗拉的线速度Vh1i、Vh2i和Vh3i5) When drafting and blending the yarn Y of the i-th segment, under the premise of knowing the set linear density ρ yi of the i-th segment and the set blending ratios k 1i , k 2i and k 3i , according to formulas (2)-(6 ) Calculate the linear speeds V h1i , V h2i and V h3i of the first rear roller, the second rear roller and the third rear roller;

6)在基准线段的基准线速度Vh10、Vh20和Vh30基础上,增减第一后罗拉、第二后罗拉和/或第三后罗拉的转速,实现第i段纱线Y的线密度或/和混纺比的在线动态调整。6) On the basis of the reference line speeds V h10 , V h20 and V h30 of the reference line segment, increase or decrease the rotational speed of the first rear roller, the second rear roller and/or the third rear roller to realize the line speed of the i-th segment yarn Y. Online dynamic adjustment of density or/and blending ratio.

7)设ρ1=ρ2=ρ3=ρ,则公式(5)简化为:7) Suppose ρ 123 =ρ, then formula (5) can be simplified as:

根据公式(2)-(4)和(6)-(7)计算出所述第一后罗拉、第二后罗拉和第三后罗拉的线速度Vh1i、Vh2i和Vh3i;在基准线速度Vh10、Vh20和Vh30的基础上,增减第一后罗拉和/或第二后罗拉的转速实现设定的第i段纱线Y线密度或/和混纺比。According to formula (2)-(4) and (6)-(7), calculate the linear velocity V h1i , V h2i and V h3i of described first back roller, second back roller and the 3rd back roller; On the basis of the speeds V h10 , V h20 and V h30 , increase or decrease the rotational speed of the first back roller and/or the second back roller to achieve the set i-th section yarn Y linear density or/and blending ratio.

8)在纱线Y从第i-1段转换到第i段的瞬间,设纱线Y的线密度在基准线密度的基础上增加动态增量Δρyi,即粗细发生Δρyi;为此所述第一后罗拉、第二后罗拉和第三后罗拉的线速度分别在基准线速度的基础上发生相应增量,即(Vh10+Vh20+Vh30)→(Vh10+ΔVh1i+Vh20+ΔVh2i+Vh30+ΔVh3i)时,纱线Y线密度的增量为:8) At the moment when the yarn Y is converted from the i-1 segment to the i segment, the linear density of the yarn Y is set to increase the dynamic increment Δρ yi on the basis of the reference linear density, that is, the thickness occurs Δρ yi ; The linear speeds of the first rear roller, the second rear roller and the third rear roller respectively increase correspondingly on the basis of the reference linear speed, namely (V h10 +V h20 +V h30 )→(V h10 +ΔV h1i + When V h20 +ΔV h2i +V h30 +ΔV h3i ), the increment of yarn Y linear density is:

则纱线Y的线密度ρyi可表达如下:Then the linear density ρyi of the yarn Y can be expressed as follows:

令ΔVi=ΔVh1i+ΔVh2i+ΔVh3i,则(8)变为:Let ΔV i = ΔV h1i + ΔV h2i + ΔV h3i , then (8) becomes:

通过控制所述第一后罗拉、第二后罗拉和第三后罗拉的线速度增量之和ΔVi实现纱线Y的线密度变化。The linear density change of the yarn Y is realized by controlling the sum ΔV i of the linear speed increments of the first rear roller, the second rear roller and the third rear roller.

9)令ρ1=ρ2=ρ3=ρ,则在纱线Y从第i-1段转换到第i段的瞬间,纱线Y的混纺比,即公式(2)和(3)简化为:9) Let ρ 1 = ρ 2 = ρ 3 = ρ, then at the moment when the yarn Y switches from the i-1th section to the i-th section, the blending ratio of the yarn Y, that is, formulas (2) and (3) simplify for:

通过控制所述第一后罗拉、第二后罗拉和第三后罗拉的线速度增量实现纱线Y的混纺比的调整;The adjustment of the blending ratio of the yarn Y is realized by controlling the line speed increment of the first back roller, the second back roller and the third back roller;

其中,in,

ΔVh1i=k1i*(Vz+ΔVi)-Vh10 ΔV h1i =k 1i *(V z +ΔV i )-V h10

ΔVh2i=k2i*(Vz+ΔVi)-Vh20 ΔV h2i =k 2i *(V z +ΔV i )-V h20

ΔVh3i=k3i*(Vz+ΔVi)-Vh30ΔV h3i =k 3i *(V z +ΔV i )−V h30 .

10)令Vh1i1+Vh2i2+Vh3i3=H,H为常数,则ΔVi恒为0,由此,实现所述纱线Y的混纺比调整的同时保证线密度不变。10) Let V h1i1 +V h2i2 +V h3i3 =H, H is a constant, then ΔV i is always 0, thereby realizing the adjustment of the blending ratio of the yarn Y while ensuring The linear density does not change.

11)令ΔVh1i、ΔVh2i和ΔVh3i其中一个或两个为零,其他不为零,则实现所述纱线Y中一种或两种粗纱组份的变化,而其他粗纱组份不变化,调整后的混纺比为:11) If one or two of ΔV h1i , ΔV h2i and ΔV h3i are zero, and the others are not zero, one or two roving components in the yarn Y will be changed, while the other roving components will not change , the adjusted blending ratio is:

其中,k,j∈(1,2,3),且k≠j。Among them, k, j∈(1, 2, 3), and k≠j.

12)令ΔVh1i、ΔVh2i和ΔVh3i都不为零,则实现所述纱线Y中三种粗纱组份的变化。12) If ΔV h1i , ΔV h2i and ΔV h3i are not zero, the three roving components in the yarn Y can be varied.

13)令Vh1i、Vh2i和Vh3i其中一个或两个为零,而其它不为零,则实现在第i段纱线Y中一种或两种粗纱组份的不连续。13) Let one or two of V h1i , V h2i and V h3i be zero, while the others are not zero, so that the discontinuity of one or two roving components in the i-th segment yarn Y is realized.

以上结合附图仅描述了本申请的几个优选实施例,但本申请不限于此,凡是本领域普通技术人员在不脱离本申请的精神下,做出的任何改进和/或变形,均属于本申请的保护范围。The above only describes several preferred embodiments of the present application in conjunction with the accompanying drawings, but the present application is not limited thereto, any improvement and/or deformation made by those skilled in the art without departing from the spirit of the present application shall belong to protection scope of this application.

Claims (6)

1. A method for regulating and controlling the linear density and the blending ratio of yarns by three-component asynchronous and synchronous drafting is characterized by comprising the following steps:
1) the drafting and twisting system comprises a primary drafting unit and a secondary drafting unit which are arranged in front and back;
2) the primary drafting unit comprises a combined rear roller and a middle roller; the combined back roller has three rotational degrees of freedom and comprises a first back roller, a second back roller and a third back roller which are arranged on the same back roller shaft side by side; the first back roller, the second back roller and the third back roller are respectively at a speed Vh1、Vh2And Vh3Moving; middle roller with speed VzIs rotated at the speed of (1); the secondary drafting unit comprises a front roller and a middle roller; front roller with surface linear velocity VqRotating; any one of the first rear roller, the second rear roller and the third rear roller is fixedly arranged on the rear roller shaft, the other two rear rollers are arranged on the rear roller shaft in a mutually independent rotating manner, and the speed of the middle roller is fixed and is not more than the sum of the speeds of the first rear roller, the second rear roller and the third rear roller in the drafting process;
respectively setting the linear densities of the first component roving, the second component roving and the third component roving drafted by the first rear roller, the second rear roller and the third rear roller as rho1、ρ2And ρ3And the linear density of the yarn Y obtained after the front roller drafting twisting is rhoy
3) Dividing the yarn Y into n sections according to a set blending ratio and/or linear density, wherein the linear density and the blending ratio of each section of yarn Y are the same, and the linear density or the blending ratio of two adjacent sections is different; when the i-th section of yarn Y is drafted, the linear speeds of the first back roller, the second back roller and the third back roller are respectively Vh1i、Vh2iAnd Vh3iWhere i ∈ (1,2, …, n);
after the i-th section of yarn Y formed by the first component roving, the second component roving and the third component roving through two-stage drafting and twisting, the blending ratio k of the first component roving, the second component roving and the third component roving is1i、k2iAnd k3iCan be expressed as follows:
the linear density of the i-th section of yarn Y is as follows:
wherein,the second-stage draft ratio;
4) let a section of the n sections of yarn Y with the lowest linear density be defined as a reference line section, and the reference line density of the section be rho0And the reference line speeds of the first back roller, the second back roller and the third back roller of the section are respectively Vh10、Vh20And Vh30(ii) a The reference blending ratio of the first component roving, the second component roving and the third component roving of the section is respectively k10、k20And k30
The linear velocity of the middle roller is kept constant,
and V isz=Vh10+Vh20+Vh30(6);
At the same time, let the secondary draft ratioConstant;
wherein the reference linear velocity V of the first back roller, the second back roller and the third back rollerh10、Vh20And Vh30According to the material and reference line density rho of the first component roving, the second component roving and the third component roving0And a reference blend ratio k10、k20And k30Setting in advance;
5) when drafting and blending the i-th section yarn Y, the set linear density rho of the i-th section is knownyiAnd setting the blending ratio k1i、k2iAnd k3iOn the premise of calculating the linear speed V of the first back roller, the second back roller and the third back roller according to the formulas (2) to (6)h1i、Vh2iAnd Vh3i
6) Reference line velocity V in reference line segmenth10、Vh20And Vh30On the basis, the rotating speeds of the first back roller, the second back roller and/or the third back roller are increased or decreased, so that the on-line dynamic adjustment of the linear density or/and the blending ratio of the i-section yarn Y is realized;
let ρ be1=ρ2=ρ3Where ρ, equation (5) is simplified as:
calculating linear speeds V of the first back roller, the second back roller and the third back roller according to formulas (2) - (4) and (6) - (7)h1i、Vh2iAnd Vh3i(ii) a At the reference line velocity Vh10、Vh20And Vh30On the basis of the yarn density and/or the blending ratio of the ith section of yarn Y, increasing and decreasing the rotating speed of the first back roller, the second back roller and/or the third back roller;
at the moment when the yarn Y is switched from the section i-1 to the section i, the linear density of the yarn Y is set to be increased by a dynamic increment △ rho on the basis of the reference linear densityyiI.e. thickness generation △ ρyi(ii) a For this purpose, the linear velocities of the first back roller, the second back roller and the third back roller are respectively increased correspondingly on the basis of the reference line velocity, namely (V)h10+Vh20+Vh30)→(Vh10+ΔVh1i+Vh20+ΔVh2i+Vh30+ΔVh3i) And the increment of the linear density of the yarn Y is as follows:
linear density rho of the yarn YyiCan be expressed as follows:
let Delta Vi=ΔVh1i+ΔVh2i+ΔVh3iThen (8) becomes:
by controlling the sum delta V of the linear velocity increments of the first back roller, the second back roller and the third back rolleriA linear density variation of the yarn Y is achieved.
2. A method of regulating the linear density and blend ratio of a yarn as in claim 1 wherein let ρ be1=ρ2=ρ3At the instant when yarn Y switches from the i-1 th stage to the i-th stage, the blending ratio of yarn Y, i.e., equations (2) to (4), is reduced to ρ:
adjusting the blending ratio of the yarn Y by controlling the linear velocity increment of the first back roller, the second back roller and the third back roller;
wherein,
ΔVh1i=k1i*(Vz+ΔVi)-Vh10
ΔVh2i=k2i*(Vz+ΔVi)-Vh20
ΔVh3i=k3i*(Vz+ΔVi)-Vh30
3. the method for regulating and controlling the linear density and blending ratio of yarns according to claim 2, wherein V is madeh1i1+Vh2i2+Vh3i3H is a constant, then Δ ViThe yarn density is constantly 0, so that the linear density is kept unchanged while the blending ratio of the yarn Y is adjusted.
4. The method for regulating and controlling the linear density and blending ratio of yarns according to claim 2, wherein Δ V is adjustedh1i、ΔVh2iAnd Δ Vh3iOne or two of the roving yarn components are zero, the other roving yarn components are not zero, the variation of one or two roving yarn components in the yarn Y is realized, the other roving yarn components are not varied, and the adjusted blending ratio is as follows:
wherein k, j ∈ (1,2,3), and k ≠ j.
5. The method for regulating and controlling the linear density and blending ratio of yarns according to claim 2, wherein Δ V is adjustedh1i、ΔVh2iAnd Δ Vh3iAnd if the components are not zero, the variation of the three roving components in the yarn Y is realized.
6. The method for regulating and controlling the linear density and blending ratio of yarns according to claim 2, wherein V is madeh1i、Vh2iAnd Vh3iOne or two of which are zero and the other of which are non-zero, a discontinuity in one or both roving components in the i-th yarn section Y is achieved.
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