电脑粗纱机控制系统数学模型的建立与应用

Establishment and application of mathematical model of computerized fly frame control system

针对传统粗纱机机械结构的复杂性,分析了粗纱卷绕成形的原理,提出多电动机传动粗纱机的逐级设计方案,取消了繁杂的机械结构,其相应的功能由计算机控制多个电动机完成。分析3种卷绕数学模型建立方法的区别,并由此建立粗纱卷绕成形数学模型,给出每层厚度和筒管直径对纺纱张力影响的趋势线,特别是从实际使用的角度分析了理想换向禁停的区域,实现了换向禁停数学模型其包括大小纱不同和换向前后不同,为实现良好的成形提供了保证。同时介绍了电脑粗纱机与传统粗纱机参数调整方法的区别,认为电脑粗纱机可以方便地设置、更改参数,变换粗纱品种,具有较高的实用价值。

According to the complexity of the mechanical structure of conventional fly frame,the paper analyzed the shaping principle of roving winding,and put forward the overall design scheme of multi-motor driving fly frame,eliminating the multifarious mechanical structure whose corresponding function is fulfilled by several motors controlled by a computer.It discussed the differences of three winding mathematic models,and established a mathematic model of roving winding accordingly.The influence of average thickness of each roving layer and the diameter of bare bobbin on the yarn tension was presented,as well as the related curves.Especially,from the point of view of practical use,the zone of ideal reversing and stop-inhibition was analyzed,and a mathematical model of reversing and stop-inhibition was developed,and suitable for yarns of various counts and reversing either back or forward,thus providing a guarantee for good shaping.The differences of parameters adjustment methods between the computerized fly frame and the conventional one were introduced,showing that the computerized fly frame has higher practical value for its convenience in parameter presetting and adjusting,and change of roving varieties as well.