纺织学报 ›› 2018, Vol. 39 ›› Issue (09): 153-159.doi: 10.13475/j.fzxb.20170906207

• 机械与器材 • 上一篇    下一篇

圆纬机主动式动态送纱控制技术

    

  • 收稿日期:2017-09-30 修回日期:2018-06-19 出版日期:2018-09-15 发布日期:2018-09-12
  • 基金资助:

     

Control technology for active dynamical yarn feeding for circular weft knitting machine

  • Received:2017-09-30 Revised:2018-06-19 Online:2018-09-15 Published:2018-09-12

摘要:

针对当前圆型纬编针织机送纱量不可动态无极调节导致的成圈编织时纱线松紧不可调,且存在线圈大小单一和筒型织物头尾端直径大小不可调控等问题,提出了一种伺服电动机送纱量与速度跟随主轴位置与速度的圆型纬编针织机主动式动态送纱控制方案。依据圆纬机编织原理及送纱要求,采用ARM 处理器、响应伺服电动机和正交编码针位采集器,设计实现了基于位置和速度实时控制的动态送纱控制系统。依据正交编码脉冲计数获得实时针筒位置和速度信号,分析了控制技术中关键硬件电路设计、软件开发的实现过程及编织过程,实现伺服电动机动态位置跟随及速度跟随的控制方法。结果表明,采用本文控制技术实现的主动送纱装置,送纱量可动态调整,使得线圈大小可变,纱线松紧动态可调,筒型织物直径大小可变,改善了织物面料的外观和体感。

关键词: 圆纬机, 主动式动态送纱控制方案, 位置跟随, 速度跟随

Abstract:

Aiming at the problems of current circular weft knitting machines of nonadjustable yarn tighters while coil weaving dice to undynamical stepless adjustment of the yarn amount, single coil size and uncontrallabe diameter of two ends of cylindrical fabric, the diameter of the fabric is not controllable from beginning to the end. In view of these problems, the study designed a control technology for active dynamical yarn feeding for, in which the quantity of yarn and the speed of servo motor could follow the position and speed of the spindle.The dynamic control system based on location and speed control was designed according to the weft knitting principle and the requirement of yarn delivery, which uses a ARM processor, a servo motor and a encoder of collecting needle position. The design of key hardware circuit, the implementation of software development, and the control method which according to the position and speed signal by the orthogonal coding pulse count the control technology were discussed as far as the control technology was concerned. The dynamic position following and speed following of the servo motor were realized. The test results show that the active yarnfeeding device realized by this control technology has many advantages, that the amount of yarn can be adjusted dynamically, the size of the coil can be changed, the tightness of yarn can be adjusted dynamically, and the diameter of cylindrical fabric is variable, which improved the appearance and body feeling of fabric.

Key words: circlular weft knitting machine, active dynamical yarn feed control technology, position following, speed following

中图分类号: 

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