The Mechanics Models Of The Magnetic Levitation Mode Of Driving Needles And The Finite Element Analysis Of Key Parts

In recent years, the maglev technology becomes a new kind of mechatronic drivetechnology which has some obviously advantages, such as no friction, no contact, low powerconsumption, low noise and so on. At present, most of the knitting factories are relaying onthe mode of importing and digesting and then recreating to product the original technicalprinciple, the basic process, the research and development of the core components, the highspeed and effective driver and the system integration technique of most high-end knittingequipment. This paper focuses on the circular knitting machine and investigates the needleselection principle and researches the mechanical model of the magnetic suspension type ofdriving needle device and provides a theoretical basis for the study of the control system.The main research contents are as follows:1.This paper introduces the magnetic suspension type of driving needle device based onthe traditional circular knitting machine, and uses the finite element to analyze how thedynamic performance of needle influences its own movement. Then the paper puts forward anew type of needle selection mode which based on the principle of electromagnetic permanentmagnetic. It also explores the establishment of mathematical model for the driven needletrajectory in the narrow space and focuses on the stress while the needles are moving to findthe theoretical parameters for their dynamic analysis.2. This paper researches the electromagnetic force of the magnetic suspension device,and uses MATLAB to analyze the data obtained and then compares the analysis results withthe experimental results to verify the reliability of the analysis of the electromagnetic force.So that it can provide the feasible theoretical basis for the experiment and method of magneticsuspension type of driving a single needle or multiple needles follow-up.3. This paper also explores the electromagnetic shielding problems of the magneticsuspension device. It uses the finite element software to analyze effects of the needle cylinderon the magnetic shielding efficiency and research the frictional heat between the needle andthe cylinder with finite element thermal analysis. Then it verifies that when the magnetic shielding of the needle cylinder effect the needle cylinder can also withstand the temperaturefield and stress field of the device, all that can provide the feasible theoretical basis for theestablishment of the magnetic suspension type of driving needles device.4. At the end of the paper, it verifies the reliability of the analysis process throughexperiments and it also analyses the coupling of the magnetic suspension device and verifiesthat the magnetic suspension device is feasible.In a word, this topic combines with the key technology of knitting machine and gives acomprehensive introduction of the design principle, design process, analysis method of themagnetic suspension device.