纺丝机纺出的涤纶原丝需经过牵伸定型后,才具有一定的纤度、强度、伸度和其它的物理能。VC443A牵伸加捻机用于涤纶复丝生产过程中牵伸加捻工序。牵伸丝为低捻复丝,可直接或经加弹工序后供绸厂使用。它的电气部分由电源控制系统、程序控制系统、锭子交流变频调速系统、热盘控制系统、热板控制系统组成。随着机电一体化技术的发展,对系统的可靠要求愈来愈高,因PLC具有控制可靠、体积小、功能强、速度快,组态灵活和可扩展的特点而得到了广泛的应用,成为自动化系统中的基本电控装置,故VC443A牵伸加捻机选用PLC可编程控制器,实现了生产的自动控制
采用PLC可编程控制器控制的VC443A牵伸加捻机,在进行梯形图设计时充分利用PLC的软元件(如计时器、辅助继电器,定时器等)合理设计PLC输入、输出元件的状态监测程序,可屏蔽输入元件的误信号,防止输出元件的误动作,其工作能稳定且各输入/输出点简单明了,充分发挥PLC高可靠、高抗的特点,寿命长,维修量少,查找外部线路简单,获得了成功应用,实现设备生产过程自动化,提高劳动生产率,改善企业管理,创造了企业经济效益。
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