喷气涡流纺金属丝包芯纱成纱过程的在线观测与分析
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摘要
为研究喷气涡流纺金属丝包芯纱成纱过程中纤维运动状态与包缠效果,设计了基于工业内窥镜的在线观测装置,实现了对金属丝与短纤维在喷嘴内腔中运动图像的捕捉;提取纤维包缠过程中的露芯特征,与制成包芯纱的露芯量进行对比分析,并研究了喷嘴气压与纺纱速度对纱线露芯量的影响。研究表明:短纤维包缠金属丝的运动状态主要分为3类,短纤维以一定的螺旋角均匀包覆金属丝,短纤维头端包缠金属丝而尾端倒伏于锭子上或呈螺旋状松散分布在金属丝周围,短纤维尾端包缠金属丝而头端呈自由离散状态;纱线露芯量随喷嘴气压的提高先降低后增加,随纺纱速度的提高先增加后降低;在线观测结果与成纱的露芯量随工艺参数变化的趋势较为一致。
In order to investigate the dynamics and wrapping quality of the fibers in the formation process of the vortex core-spun yarn containing metal wire, a device for the online monitoring based on an industrial endoscope was designed and images of the metal wire and the staple fibers moving in the spinning nozzle was captured. The characteristics of the exposed metal wire core during the wrapping process of the fibers were extracted. Comparative analysis of the amounts of exposed metal wire core in the wrapping process and in the yarn was performed. Influences of nozzle pressure and yarn delivery speed on the amounts of exposed metal wire core were also studied. The results show that the motional characteristics of staple fibers in the wrapping process can be grouped into three main categories: fibers evenly covering the metal wire with a certain helix angle; trailing ends of the fibers being expanded on the spindle or loosely distributed around the metal wire in spiral configurations with their leading ends having wrapped around the metal wire; and leading ends of the fibers being in a free and separated state with their trailing ends having wrapped around the metal wire. The amount of the exposed metal wire core decreases first and then increases with the increase of the nozzle pressure, while it increases first and then decreases with the increase of the yarn delivery speed. The variation trend of the amount of exposed metal wire core with the process parameters is in accordance with the online monitored results.
In order to investigate the dynamics and wrapping quality of the fibers in the formation process of the vortex core-spun yarn containing metal wire, a device for the online monitoring based on an industrial endoscope was designed and images of the metal wire and the staple fibers moving in the spinning nozzle was captured. The characteristics of the exposed metal wire core during the wrapping process of the fibers were extracted. Comparative analysis of the amounts of exposed metal wire core in the wrapping process and in the yarn was performed. Influences of nozzle pressure and yarn delivery speed on the amounts of exposed metal wire core were also studied. The results show that the motional characteristics of staple fibers in the wrapping process can be grouped into three main categories: fibers evenly covering the metal wire with a certain helix angle; trailing ends of the fibers being expanded on the spindle or loosely distributed around the metal wire in spiral configurations with their leading ends having wrapped around the metal wire; and leading ends of the fibers being in a free and separated state with their trailing ends having wrapped around the metal wire. The amount of the exposed metal wire core decreases first and then increases with the increase of the nozzle pressure, while it increases first and then decreases with the increase of the yarn delivery speed. The variation trend of the amount of exposed metal wire core with the process parameters is in accordance with the online monitored results.
引文
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[3] 张岩,裴泽光,陈革.喷气涡流纺金属丝包芯纱的制备及其结构与性能[J].纺织学报,2018,39(5):25-31.ZHANG Yan,PEI Zeguang,CHEN Ge.Fabrication,structure and properties of vortex core-spun yarn containing metal wire [J].Journal of Textile Research,2018,39(5):25-31.
[4] PEI Z,LIU C,CHEN G,et al.Experimental study on the fiber motion in the nozzle of vortex spinning via high-speed photography [J].Journal of Natural Fibers,2012,9(2):117-135.
[5] PEI Z,YU C.Numerical study on the effect of nozzle pressure and yarn delivery speed on the fiber motion in the nozzle of Murata vortex spinning [J].Journal of Fluids and Structures,2011,27(1):121-133.
[6] 裴泽光.喷气涡流纺纤维与气流耦合作用特性及应用研究[D].上海:东华大学,2011:38-78.PEI Zeguang.Study on the characteristics and application of the fiber-airflow interaction in vortex spinning [D].Shanghai:Donghua University,2011:38-78.
[7] 韩晨晨,程隆棣,高卫东,等.基于有限元模型的喷气涡流纺纤维运动轨迹模拟[J].纺织学报,2018,39(2):32-37.HAN Chenchen,CHENG Longdi,GAO Weidong,et al.Simulation of fiber trajectory in jet vortex spinning based on finite element model [J].Journal of Textile Research,2018,39(2):32-37.
[8] 裴泽光,何建,张岩.喷气涡流纺纱喷嘴内纤维运动状态实时观测装置及方法:201810127312.7[P].2018-02-08.PEI Zeguang,HE Jian,ZHANG Yan.Method and apparatus for the online monitoring of dynamics of fibers in the nozzle of a vortex spinning machine:201810127312.7[P].2018-02-08.
[9] 迟开龙,潘如如,刘基宏.基于数字图像处理的纱线条干均匀度检测初探[J].纺织学报,2012,33(12):19-24CHI Kailong,PAN Ruru,LIU Jihong.Primary discussion on detection of yarn evenness based on digital image processing [J].Journal of Textile Research,2012,33(12):19-24.
[10] 牟新刚,蔡逸超,周晓.基于机器视觉的筒子纱缺陷在线检测系统[J].纺织学报,2018,39(1):139-145.MOU Xingang,CAI Yichao,ZHOU Xiao.On-line yarn cone defects detection system based on machine vision [J].Journal of Textile Research,2018,39(1):139-145.
[11] KIM H J,KIM J S,LIM J H,et al.Detection of wrapping defects by a machine vision and its application to evaluate the wrapping quality of the ring core spun yarn [J].Textile Research Journal,2009,79(17):1616-1624.