斗轮式取料机瞬时取料量自动控制技术的研究及其节能应用

秦皇岛港是目前全球最大的煤炭输出港,它以“悬臂式斗轮取料机-皮带机输送机-装船机”为主要转运设备进行煤炭装船作业.本文旨在探索高效的取料机作业方式来实现装船作业效率的最大化,降低作业能耗.分析了斗轮取料机的特点及其取料操作方式,并在此基础上引入了闭环自动控制方法,构建了以恒定瞬时取料量为控制目标的闭环控制系统.该系统以PLC为控制核心,基于变频驱动的回转系统作为执行部分控制斗轮取料机的悬臂回转速度进行取料作业,同时通过皮带秤实时检测输送带瞬时取料量并结合即时的斗轮驱动电机电流数据作为作业实时数据反馈,由此构建了一种基于Profibus-DP现场总线的斗轮取料机自动作业控制系统.该系统试运行于河北港口集团秦皇岛港股份有限公司第六港务分公司,提高了取料作业效率,减少了人为因素造成的超载作业,节能效果显著.

Research of automatic control technology for instantaneous reclaiming rate of a bucket-wheel reclaimer and its energy-saving application

As the largest coal mine exporting port, Qinhuangdao Port employs ＂ Crane type bucket wheel reclaimer-belt conveyor-shipment loader＂ infrastructure to fulfill the shipment. This paper is to explore a high efficiency operation mode of the reclaimer to maximize the loading productivity, while to reduce the power consumption. The features and reclaiming operation method of a bucket-wheel reclaimer are analyzed. Based on the analysis, a closed loop method is introduced. A closed loop control system is constructed for measuring instantaneous reclaiming rate by using a belt weigher in real time. Combining with the collected current signal from the bucket wheel, the field bus is used as the detecting device. By using PLC as control centre in the system, the reclaiming procedure is done by a closed loop intelligent control over the bucket wheel boom rotating velocity combined with real-time motor current data of bucket wheel drive which is used as operating data feedback. A novel automatic controlling system for bucket wheel reclaimer is proposed which is based on profibus-DP fieldbus. This system is now under pilotrun at the Number 6 Branch Company of the Qinhuangdao Port Company Limited, with reclaiming rate increased, overloading operation minimized and significant electric energy saving effect achieved.