Research Of Real-Time Control System For Knitting Seamless Sleeve Machine

In recent years,seamless knitting products are gradually loved by people and seamless knitting equipment has also been continuously developed.As a new generation of mechatronic seamless knitting machinery,knitting seamless sleeve machine is used for weaving all kinds of seamless sleeves.However,compared with foreign countries,domestic research on seamless knitting equipment started relatively late and the level of research has a big gap.The high-grade knitting seamless sleeves machine is mainly imported from Japan,Germany,Italy and other developed countries,and the core technology is monopolized by foreign enterprises.Therefore,in order to improve the international influences and competitiveness of China's knitting industry,it is necessary to study the control system of knitting seamless sleeve machine,and prorpse new solutions to the technical problems of key nodes.The paper takes the real-time control system of knitting seamless sleeve machine as the research object,according to the technological realization requirements of seamless sleeves and the structure of seamless seamless sleeves and the characteristics of control objects,the general scheme of real-time control system of seamless seamless sleeves is proposed.The scheme adopts the modular design concept,and divides the whole control system into three parts: human-computer interaction module,real time master control module and actuating mechanism drive module.This paper discusses the implementation of the three modules in detail from the hardware design and software development of the control system.The human-computer interaction module selects Feiling i.MX6 UL core board and Linux operating system as the development platform,the paper discussed the design principles of human-computer interface and the communication protocol between human-computer interaction module and real-time contral module.The real-time contral module adopts the dual core architecture,the paper expounded the principle that the logic processing unit with M7A12N0F484C7 as the core realizes the fast data interaction between human-computer interaction module and real-time contral module;introduced the process of main control unit with STM32F429 IG as the core to execute pattern file analysis,action instruction transmission and other tasks.The actuating mechanism drive module mainly includes the yarn feeding mechanism,the weaving mechanism,the needle selecting mechanism and the drawing and rolling-up mechanism.For the yarn feeding mechanism,the paper is put forward an active yarn feeding method based on AC servo motor direct drive,and uses the speed compensation algorithm to ensure control accuracy of servo motor speed and position.For the weaving mechanism,the paper uses the PWM wave maintaining mode to drive the electromagnetic valve,so as to reduce the energy consumption;and uses S-curve acceleration and deceleration algorithm to drive the stepper motor,so as to reduce the out of step and overshoot.For the needle selecting mechanism,the paper analyses the working principle and control process of the electronic needle selector.For drawing and rolling-up mechanism,the paper is put forward drawing tension closed-loop control scheme,and uses the fuzzy PID control algorithm to control motor and ensure the tension of the cloth is constant.Experimental platform test and field installation test results show that each module of the real-time control system works normally,the communication is stable and reliable,the yarn speed is easy to adjust,the yarn tension and the sleeve face tension are stable,which meets the control requirements of the high-grade knitting seamless sleeve machine and has broad market application prospect.