tension in seamless underwear machine

 

 

WAN Zhong kui, HU Xu dong, PENG Lai hu

 

(Modern Textile Equipment Technology Engineering Research Center of Ministry 

of Education, Zhejiang Sci Tech University, Hangzhou 310018, China)

 

 

Abstract: Aiming at the tension of the yarn changing in time when the seamless underwear machine is knitting and current controller′s poor anti interference ability and low precision,many researches were carried on,such as the acquisition of yarn tension,driving a DC motor,the transmission of data and constant yarn tension. Then,a controller based on CAN bus communication and fuzzy parameter self tuning PID was put forward. The hardware circuit of controller ,the software of controller,the operating principle of the yarn tension test circuit,the DC motor driving circuit,the CAN bus interface circuit and the yarn breaking alarm circuit and communication method of CAN bus were discussed. In addition,a fuzzy parameter self tuning PID control method was expounded.After simulating with Simulink,the veracity of the controller was verified.The results indicate that self tuning PID controller could not only solve the problem of the nonlinear time varying and realize constant tension of yarns to make the loop uniform,but also improve the stability and real time ability.

 

Key words: constant tension; yarns; CAN bus; self tuning PID