桥式抓斗起重机自动化系统的设计

摘要

针对传统的抓斗起重机在电力拖动和电气控制器的缺点，设计了PLC控制系统取代继电器和接触器组成的控制电路，利用变频器“下垂控制”功能实现提升绳和开闭绳等拉力，提高电能的工作效率，优化了抓斗的可操控性，降低了设备故障率。%In view of deficiencies of traditional grab cranes in electric dragging and electric control,a PLC control system is designed to replace the control circuit composed of the relay and the contact,which can provide tensile forces such as rope lifting,opening,and closing using the “droop control”function of the converter,hence to improve the work-ing efficiency,optimize controllability of the grab,and reduce the equipment fault rate.