Design Of Triangular Track Optimization And Control System For Multi-functional High Speed Cotton Hosiery Machine

In recent years,the demands for diversification and efficiency of socks have imposed strict requirement on the versatility,high-speed,stability,and real-time function of cotton hosiery machines.On the one hand,domestic cotton hosiery machines can’t meet the requirements of multi-functional organization such as different organization structures on the bottom and back of cotton socks,socks body jacquard,terry,double rib ribs,etc.The pattern organization is single.What’s more,the running speed of the cotton hosiery machine can’t be improved,which affects the knitting efficiency of the socks.On the other hand,the electronic control system has a direct impact on quality of socks,but Chinese electronic control technology still lags behind cotton hosiery machines powerhouses such as Italy.Therefore,it is of great significance to carry out the optimization of the cam track of the high-speed cotton hosiery machine and the design of the electronic control system matching it.In the early period of this article,I introduce the knitting process of terry and jacquard,and demonstrate the multifunctional characteristics of cotton hosiery machines.I use experimental method of elastic mechanic analysis calculation and ANSYS dynamic simulation analysis to improve the track of cotton hosiery machine from the perspective of triangle orbit optimization.The cotton hosiery machine can work at 200rpm high-speed rotation.In the later period,a corresponding control system based on the STM32F207 integrating hardware and software was developed for the cotton hosiery machine optimized by the high-speed triangle.The real-time and stability performance of the control system was verified by the CAN bus test and the knitting stability test.The following work was carried out:(1)Based on the technological research on buffet,heels,and stocking toe,the movement coordination between the actuators is analyzed,and introduce the knitting process of the multi-functional cotton hosiery machine to realize two kinds of tissues;terry and jacquard.(2)I established the elastic dynamic model of cam between needles.The conclusion is drawn on the characteristics of the cycloidal triangle by analyzing and comparing the characteristics of various triangular curves:the cycloidal curve has no sudden changes,the variable acceleration is beneficial to mitigate the impact during the high-speed operation of the cotton hosiery machine.A mechanical model is established for the cycloid triangle curve.The stress σ,acceleration a,and jump j of the linear-circular curve and the cycloid curve are compared.Through ANSYS Finite element analysis further proves that after optimization,the stress is reduced by 15%,the acceleration is reduced by 77%,and the transition is reduced by 76%.(3)According to the needs of the optimized knitting mechanism of the high-speed cotton hosiery machine,I designed an integrated modular high-speed cotton hosiery machine control system,which based on the STM32F207 main control chip and the bus layered architecture,according to the needs of analysis and design of the hardware circuit based on KE06 with slide cam selector,valve,motor,write a specific pattern file according to the knitting process,formulate the pattern process format and the CAN transceiver protocol of the slide cam selector,valve,and motor,corresponding software programs are written for the implementation of the main control and actuator actions.(4)At last,each actuator module was tested to demonstrate the stability of the high-speed cotton hosiery machine system,the knitting speed is at 203rpm.The socks are not only of good quality and rich structure,which meets the multi-functionality,high-speed,stable control of the cotton hosiery machine knitting pattern organization.