基于PLC的电子送经和电子卷取控制系统

为提高电子送经和电子卷取系统在国产织机上的普及度,进而提高织物的质量,设计了一种可以用较低成本完成所需控制功能的电子送经和电子卷取控制系统。该系统根据织机主轴角度选择合适的采样时间,采集有效的经纱张力信号;利用PLC内置的PID控制功能和位置功能,在PLC的软件设计中应用数字PID控制的部分成果,结合交流伺服系统,以高分辨率精确、快速地控制伺服电机的转速和方向,保证纺织过程中经纱张力均匀。多次打纬试验证明,该电子送经和电子卷取控制系统运行稳定,响应速度较快,经纱张力恒定。

Electronic let-off and take-up control system based on PLC

To popularize the electronic let-off(ELO) and electronic take-up(ETU) control system on homemade loom and improve the quality of textiles,the article designed an ELO and ETU control system which can fulfill the required control function at a comparatively low cost.The system collects available signals of warp tension by choosing appropriate sampling time according to the loom′s axis angle,applies partial results of numeral proportional-integral-derivative(PID) control in programmable logic controller(PLC) software design by means of the built-in PID control function and the position function of PLC,and,coupled with AC servo system,accomplishes fast and accurate control of the rotating speed and direction of the servo electromotor,thus ensuring a uniform tension of the warps during weaving.The experiments of beating-up proved that the ELO and ETU control system runs stably and responds quickly,and that the warp tension is uniform and constant.