基于PLC的卷取张力控制与高精度排丝系统的设计（机械CAD图纸）.doc

摘要 排丝系统是焊丝生产的关键系统之一，其控制的好坏直接影响到焊丝的质量。目前的排丝机多采用零角度排丝，可靠性低。本文根据现有的排丝设备及现有的制备条件，从方便性及实用性的角度出发设计一套符合自身条件的自动排丝系统。整个系统由西门子系列S7-200可编程序控制器作为控制核心。改造以后，可以实现整个制备过程及排丝的自动化控制。 本文首先介绍了排丝机机械结构的组成和工作原理。其次，为实现焊丝的自动排丝，设计了硬件控制系统和软件控制系统。硬件由模拟量采集模块来处理张力传感器输入的张力信号，由可编程序控制器对模拟量模块的信号操作和计算，模拟量输出传给变频器，变频器可以实现对电机速度的控制，以实现焊丝的高精度排丝。并且能使排丝伺服系统能够适应各种变化而不断的修正控制器的参数，控制速度环跟随理想模型，从而使位置环输出达到理想效果，从而实现高精度排丝。 最后，对整个系统的软件进行设计并搭建仿真模型，通过仿真研究表明在系统具有不确定因素的情况下，本文设计的解决方案对于改善系统的性能具有较明显的效果，整个系统设计完成。 关键词：可编程控制；卷取；张力控制；排丝 Abstract Wire system is one of the key systems welding wire production, its control is good or bad,what directly affects the quality of the welding wire. The current row winder row silk with the zero angle, reliability is low. In the article, according to the existing wire array equipment and preparation conditions, thinking of convenience and practical, a automatically collecting wire system is designed, that is fit to own condition. The system used the Siemens S7-200 series of Programmable Logic Controller as the control core . After the transformation, it can achieve automatic control of the entire preparation process, free of the manpower from the complex process. In this paper, it first introduced the line of silk machine mechanical mechanism composition and working principle. Secondly ,to realize automatic take-up of welding wire,the hardware control system and the winding mechanical device is designed. The analog collection module can receive the tension signal, that is come from tension sensor. The PLC can mange and calculate the analog signal. The analog signal come from analog collection hand down to the inverter. The inverter can control the speed of the motor. The speed of the winding motor runs after the tension diversification. In this case, this system can adjust the controller’s parameter when the object changed, so the speed loop can follow the ideally reference model and the position loop can have perfect control performance , the high-precision wire array can come true. Final