Research And Experiment On The Key Mechanism Of Tubular Direct Drive Electric Knitting Needle

The knitting efficiency of the traditional circular knitting machine is mainly determined by the driving method of the knitting needle assembly,and the mechanical driving method will inevitably bring about friction and wear,rigid impact,working noise and other problems in the work.This research group has been committed to the research of replacing knitting needle components with electricity,in order to further improve the working efficiency of traditional circular knitting machine needle drive components and avoid energy loss and impact noise caused by mechanical friction during the work of knitting needle components Wait.In this paper,a principle scheme of tubular direct-drive electric knitting needle is proposed,which has the advantages of precise control,rapid response,simple structure and convenient maintenance.At the same time,it has the advantages of unlimited displacement stroke,and the driving force of knitting needle can be doubled by increasing the number of coil groups.specialty.In order to achieve the goal of knitting needle pulling force of 3?5c N and displacement of 20 mm.The main research contents are:Firstly,the driving principle and main component structure of the knitting needle assembly are studied,the force model of the driving knitting needle is analyzed,and the trajectory curve of the knitting needle during the movement process is analyzed.Secondly,based on the electromagnetic theory,a theoretical model is established,and the theory is verified through numerical calculation and simulation analysis.The correct model of the model;through the knitting needle assembly model,the finite element analysis software is used to obtain the variation law of the knitting needle along the movement direction and the radial air gap magnetic density curve.The air gap magnetic density curve changes regularly and has nothing to do with the length.The length of the magnet can increase the displacement stroke of the knitting needle;by establishing different spacing models,the variation law of the air gap magnetic field curve with different spacing values is studied,and it is concluded that the fluctuation of the air gap magnetic density decreases with the increase of the spacing value;The changing law of the electromagnetic force of the knitting needle assembly under the action of different sets of coils is analyzed,and the average electromagnetic force of the theoretical model is calculated to be about 2.57 N.It is concluded that increasing the number of coil groups increases the electromagnetic force,and the magnitude of the electromagnetic force is proportional to the number of coil groups.Finally,the control model of the knitting needle assembly is analyzed,and the hardware circuit control module and the control program are verified by designing the hardware circuit control module,making the actual driver,and writing the driving control program by using the rule adoption method.According to the size of the model structure,make real objects such as knitting needles,winding coils,etc.,and build an experimental platform for knitting needle components.In the experiment,the high-speed movement of the knitting needle was driven and the displacement was about 80 mm.Using the Gauss meter equipment to conduct experiments,the variation law of the air gap magnetic density curve of the actual knitting needle is obtained,and the correctness of the theoretical analysis is verified by comparison.Through the needle driving experiment,the feasibility of the tubular direct-drive electric knitting needle scheme is verified,which provides a research basis for further research on the materialization of knitting needle components to construct circular knitting machines.