第一节 卷绕成形分析 机织学教学课件

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coils per layer decreases.
纱圈的平均节距hp = h0/m’ ,(h0为筒子高度) 随着d增大, m’减小,由此纱圈的平均节距增加。 With an increase in cone package diameter the number of
coils per layer decreases.
圆锥形筒子的卷绕特征(摩擦传动)(5)
winding characteristics of cone packages (friction drive)
纱圈位移角 angular displacement
n-导纱一个往复时筒子的 回转圈数
n’-n 的整数部分
随着 d筒 的增加, 在 0-2 间变化
圆锥形筒子的卷绕特征(摩擦传动)(1)
winding characteristics of cone packages (friction drive)
筒子与槽筒表面只有一 点线速度相等,其余各点在卷绕过程中均与槽筒表面 产生滑移。Slipping between the surface of the drum and the surface of the cone package but one point.
cone package.
圆锥形筒子的卷绕特征(摩擦传动)(3)
winding characteristics of cone packages (friction drive)
卷绕角:筒子大小端卷绕角不同,大端的卷
绕角小于小端的卷绕角。
Winding angle at the smaller end of
筒子内纱线张力的变化 (-cont)
Distribution of yarn tension within the package • 接近筒管的少量纱层里,在筒管的支撑下,不发生压缩变形,
纱线维持较大的张力
The yarn tension of those yarns near the core remains at a certain level due to the support from the bobbin.
第一章 络筒 winding
第一节 卷绕成形分析 一、筒子的卷绕形式 二、卷绕原理 1、卷绕的基本曲线 2、纱线卷绕规律 1)圆柱形筒子
第一章 络筒 winding
二、卷绕原理 2、纱线卷绕规律
2)圆锥形筒子 (cone packages) a)摩擦传动 (friction drive) 传动半径:
the package is greater than that at
ቤተ መጻሕፍቲ ባይዱthe bigger end, but tends to reach
the same.
若 V2 = 常数,且 V1小 V1大
则 小端 大端
小端
筒子大端的卷绕密度 > 筒子小端的卷绕 密度 圆锥形筒子卷绕角 沿轴向和径向均为 变量
三、卷装中纱线张力对筒子成形的影响
Effect of yarn tension on the formation of yarn packages
筒子内纱线张力的变化 Distribution of yarn tension within the package • 在络筒张力作用下,外层纱线张力对内层 纱线产生向心的压力 There exists a centripetal force from the yarn tension at outer layer of
b)锭轴传动
条件: n锭 = 常数,V2 = 常数 特点: n筒 = 常数,m = 常数
每层绕纱圈数 m’ = 常数 纱圈平均节距 hp = 常数 随着筒子直径的增加,卷绕线速增加很快。 With an increase of yarn package diameter, the winding velocity increases dramatically.
传动点:筒子与槽筒表面线速度相等的点。 Driving point: the point where the yarn winding velocity equals the
velocity on the surface of the drum. 传动半径:传动点到筒子轴心线的距离。 Driving radius: the distance between the driving point and the axis of
筒子表面仅有一点,其线速度等于槽筒表面线速度。
There exists only one point where winding velocity equals the linear speed on the surface of the drum.
该点称之为传动点,该点到筒子轴心的距离称为传动半径。
大端
D筒
圆锥形筒子的卷绕特征(摩擦传动)(4)
winding characteristics of cone packages (friction drive)
每层绕纱圈数m’ = n筒/m,(m为单向导纱次数(次/min)) 随着d增大, n筒减小,由此每层绕纱圈数减小。 With an increase in cone package diameter the number of
the package. • 在外层纱线向心压力下,内层纱线产生压缩变形,
形成弱张力区域,使张力减小,甚至松弛 Compressive deformation could occur for the yarns within the yarn package so that the yarn tension decreases until the yarns become slack.
筒子的半径沿其轴向不相等
Diameters of the cone along axial line are different.
筒子表面沿母线上各点卷绕速度不同(V大>V小)
Winding velocities along the slant height on the surface are different.
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