Structure Design And Analysis Of A New Socks Needle Pick System Based On U-type Linear Motor

Magnetic levitation technology is a new type of drive technology developed in the 20 th century,and its advantages such as no friction,no contact,low energy consumption,high efficiency,etc.have received wide public attention.This paper takes the traditional computerized jacquard socks machine as the research object,comprehensively analyzes the structural features and performance requirements of the traditional sock machine needle selection system,and proposes a new sock machine needle selection system based on the magnetic levitation technology.The principle is to use U-type linear motors.To complete the driving of the knitting needles,so as to realize knitting knitting motions of the knitting needles of the knitting machine in a state without a triangle.The feasibility of the designed needle selection system was analyzed by theoretical calculation and simulation analysis.The main research contents are as follows:The structural features and functions of the main components of the traditional jacquard socks machine are introduced.The classification of the needle selector for the sock machine and its working principle and needle selection process characteristics are further studied.From the movement trajectory of the knitting needles,the socks are analyzed.In the knitting process,the characteristics of tucking,loop formation,float threading,and unwinding provide the theoretical basis for the design of a new sock machine needle selection system.Through the research and analysis of the mainstream computerized jacquard socks machine,this paper puts forward the basic requirements that must be met to design sock machine needle selection system.Then it analyzes the dynamics of the sock knitting needles and calculates the maximum acceleration during the movement.Based on this requirement,the structural model and main parameters of the linear motor were determined.Finally,the feasibility analysis of the motor model is performed to obtain the conditions that the needle selection motor can provide to the knitting needle.According to the classical magnetic circuit method analysis of the size of the permanent magnet in the motor and the effect of magnetic field air gap on the performance of the motor,the linear motor permanent magnet size and air gap width value satisfying the sock machine needle selection requirements were obtained.Then,according to the equivalent layering principle,the motor stator and air gap magnetic field are layered,and the linear motor model is simplified,and the expression of electromagnetic force is derived.At last,the two factors that affect the normal operation of the linear motor,end effect and cogging,are analyzed theoretically.The influence of these two factors on the design of themotor and the reasonable way to reduce the influence are summarized.The related parameters of the needle selection system in the design of the new traditional computerized jacquard socks machine were analyzed and studied.The three-layer needle cylinder and related parts and components suitable for the new sock machine were designed.Three types of short-,medium-,and long-length circular knitting needles were used.The 144 knitting needles were evenly arranged on the upper,middle and lower layers.Static mechanical analysis was performed on the design knitting needles using finite element analysis software ANSYS/Workbench.Knit needle static stress strain cloud image.The modal analysis was performed on the knitting needles,and the natural frequency of the knitting needles was obtained.Compared with the operating frequency of the hosiery machine,the needle structure was verified to meet the design requirements.Finally,the magnetic field analysis software Ansoft/Maxwell was used to analyze the internal magnetic induction intensity,winding current density and magnetic induction distribution of the motor to verify the rationality of the design structure.In summary,the design of the new needle selection system is superior to the traditional mechanical needle selection system in terms of high efficiency,low noise,low energy consumption,easy control,etc.,and satisfies the requirements of sock machine operation on the needle selection system and realizes socks.Machine needles are scheduled for performance requirements.