Research And Application Of Linear Magnetic Reciprocating Yarn-Guiding System

The reciprocating yarn-guiding system is a device for evenly and efficiently winding finished yarn into different shapes for package(bobbin).As an important part of adjacent processes,yarn package has been paid extensive attention by researchers due to its great advantages in yarn storage and transportation,high-speed unwinding and dyeing.At present,there are many reciprocating yarn-guiding systems for producing different shape package,which have room for improvement in mechanical structure,work efficiency and control accuracy.Based on the traditional reciprocating yarn-guiding systems,this paper presents a new type of reciprocating yarn-guiding system--linear magnetic reciprocating yarn-guiding system – with linear magnetic driving technology.This paper first introduces several kinds of traditional reciprocating yarn-guiding systems,and compares them in mechanism complexity,reciprocating yarn-guiding precision and production efficiency,and then explains linear magnetic driving application fields,such as reciprocating feed system,maglev rail transit system and textile industry.Secondly,the working principle of the linear magnetic yarn-guiding system and the process requirements of different shape packages are studied in detail,and the motion guiding rules of package forming mechanism and reciprocating yarn-guiding mechanism are set up.By means of analysis and induction,model abstraction and reasonable hypothesis,the maximum acceleration models of two kinds of reciprocating yarn-guiding mechanism are built.By using computer simulation technology,the appropriate maximum acceleration model is selected by comparing the simulation results.The motion function of the reciprocating yarn-guiding mechanism was determined by means of the package process.Finally,some significant factors affected high quality packages are analyzed.The main research work of this paper is as follows:1.The theoretical knowledge of the linear magnetic driving technology is learnt.The linear magnetic yarn-guiding system is compared with the traditional guiding systems.And the working principle of the linear magnetic yarn-guiding system is analyzed.Combining the process requirements of different shapes of the package,the motion laws of main mechanisms of the linear magnetic yarn-guiding system are presented.2.The force of reciprocating guide mechanism in this system is analyzed,and the kinematics model of the reciprocating yarn-guiding mechanism is analyzed.The structure and operation mechanism of driving components are studied.Then the mathematical model of the electromagnetic thrust and normal suction of the reciprocating yarn-guiding mechanism is abstracted.And the equations of the maximum acceleration in the running process of the reciprocating yarn guide mechanism are given.3.The mathematical model of the maximum acceleration of the reciprocating yarn-guiding mechanism is selected and the motion law of the reciprocating yarn guide mechanism is determined by combining with the package process.The reciprocating yarn-guiding motion laws are improved by analyzing the simulation results.The motion laws of reciprocating yarn-guiding are experimented by building a prototype of reciprocating yarn-guiding mechanism and the running situation and results of the prototype are researched.4.Based on the previous discussion and experimental results,the factors affecting the package quality of linear magnetic reciprocating yarn guide system are analyzed,and suggestions for improving the package quality are put forward.Finally,the research work of this paper is summarized.The shortcomings and deficiencies in the research work are pointed out and a follow-up improvement plan of the research work is also discussed.