Bridge Crane Safety Monitor Management System Based On Siemens PLC

Currently, we are at the high civilized era, the concept of "efficiency and safety first" are in every step of the productive process. High efficiency and safety production are the top priority for the modern production. As the handling equipment of large objects, the crane plays an important role in the productive process. It needs to follow high efficiency, high reliability, high safety and other productive rules and requirements. However, in the face of recent frequently happened crane safety accidents, how to improve safety and increase efficiency become new target.In order to achieve this target, the whole operating process of the bridge crane at the scene must be monitored in real time, detected timely thus the problems of the crane shall be warned beforehand. Because of this, the equipment management personnel can easily maintain the crane. At present, there is no information management in crane industry in China, and the so called information management is just a human-computer interface (text display or touch screen), through which the real-time monitor and failure warning function can be achieved. This simple monitoring function will neither satisfy the developing productive needs, nor provide enough help for its users. First, the information management is based on the data collection, records, analysis and other functions of an individual crane. Second, it needs to achieve the centralized monitoring of many cranes. This thesis analyzes the control, monitoring, long-distance browsing of multi-crane and put it in real life by utilizing MH-SCADA software, PLC technology, wireless technology, combining the real condition of steel industry and the design requirement.This thesis analyzed the structural features of the crane and its user needs, utilizing the current situation of the monitoring system in the industry to design the overall structure of the monitoring system and make sure the data communication between PLC and on site equipment is via PROFIBUS-DP, and the data communication between upper computer and PLC is via Ethernet. Based on the structural features of the crane, this thesis completed the design of the controlling system of lifting, secondary lifting of the crane and controlling system of trolley, primary handcart and secondary handcart. It made the realization of the safety monitoring management system of the local crane by using the MH-SCADA software, and gave a detailed explanation on the functions of the real time situation, history curves, warning query, equipment information and user management.Basing on the distributed architecture of the MH-SCADA, using the remote data source of the MH-SCADA and remote OLEDB data, this paper realizes the function of remote data collecting and remote data source accessing, as well as the remote safety monitoring system of the crane and central monitoring and distributed monitoring.At end, basing on the unrealized functions and new demands of the users, this thesis proposed suggestions and solutions.