纬编针织纱线输送状态检测方法及其动态特性

为解决纬编针织纱线张力大小、直径粗细无法动态检测而导致编织异常的问题,开展了基于光电传感的非接触式纱线输送状态检测方法研究,提出双目式光电感应差分测量方法,创新设计了双路光电组件,构造两路纱线动态感应差分信号对,消除共模信号干扰,以适应纱线状态信号弱信噪比的特点。在此基础上,设计了纱线输送状态检测实验,测试积极式送纱过程中纱线在不同张力和不同直径条件下输送时实时电压信号,分析信号平均值、方差和数值频数分布曲线,分析纬编针织纱线输送的动态特性。结果表明:随着纱线张力的增大,差值信号的平均值和方差在逐渐减小,表明纱线波动幅值在逐渐下降,纱线整体波动趋向平稳;同时,改变纱线粗细会使纱线波动幅值逐渐上升,纱线波动差异逐渐增大,当纱线细度增加到一定值时,纱线波动幅值以及纱线波动差异趋于稳定。

Detection method and dynamic characteristics of weft yarn delivery

Aiming at the problem that the tension and count regularity of yarn are difficult to be dynamically detected, which may lead to abnormal weft knitting, a photoelectric sensor-based non-contact yarn delivery state detection method was developed, and a binocular photoelectric sensor differential measurement was proposed. Dual-channel photoelectric components were innovatively designed to construct two-channel yarn dynamic sensing differential signal pairs to eliminate common-mode signal interference in order to pick up the weak yarn state signals by eliminating the influence of noise. On this basis, the yarn delivery state detection experiment was designed to test the real-time voltage signal when the yarn was delivered under different tensions and with different diameters, to analyze the signal average value, variance and numerical frequency distribution curve, and to reveal the dynamic characteristics of the yarn. The results show that as the yarn tension increases, the average value and variance of the difference signal gradually decrease, indicating that the yarn fluctuation amplitude is gradually decreasing, and the overall yarn fluctuation tends to be stable. Changing the yarn thickness will cause the yarn fluctuating amplitude to increases gradually, and the yarn fluctuation difference to gradually increase. When the yarn thickness increases to a certain value, the yarn fluctuation amplitude and the yarn fluctuation difference tend to be stable.