Research To Electric Control System Of Bridge-Type Grab Ship Unloader

In the type of ship unloading machinery in bigger bulk cargo specialized wharf in our country coast harbor and the inland river harbor, bridge-type grab ship unloader obtains the widespread application. This type may adapt each kind of different bulk cargo variety (for example coal, ore, disperses grain, chemical fertilizer and so on) for unloading operation, having highly unloading efficiency, automaticity, reliability characteristic. Therefore, the research of bridge-type grab ship unloader electrical control system has the widespread practical application value.This paper takes bridge-type grab ship unloader electrical control system as the research object, on the foundation of comprehensively summarizing the domestic and foreign development dynamics of the related research to bridge-type grab ship unloader electrical control system, I detailed expatiate the electrical control system composition, the control scheme as well as the concrete realization, design a implementing scheme of bridge-type grab ship unloader regarding the inverter system as drive system, PLC as control device, the bridge-type grab ship unloader management system as monitoring control device. Main research work asfollows:First, I introduce structure and the drive mechanism characteristic of the bridge-type grab ship unloader.Second, I discuss the basic control mode and the characteristic of AC variable frequence and speed regulating, the basic principle of vector control, and propose the computing method to lectotype inverter.Third, on the foundation of analyzing the composition of bridge-type grab ship unloader electrical control system, I study grab automatic control scheme and ship unloader automatic operation control scheme, and detailed explain the key problem (reference point selection, trolley automatic positioning, automatic work flow control and so on) of bridge-type grab ship unloader automatic operation control scheme.Finally, I develop bridge-type grab ship unloader monitor management system, which can implement parameter setting, interface picture dispalying, history recording, report printing, alarm and so on the function; discuss and study ADO the data accessing mode, based on the OPC technology computer communication with PLC and so on problem, and elaborate it through the programming example.This paper combining with the research of bridge-type grab ship unloader electrical control system, has provided one kind of advanced electrical control system design proposal and the realization method. The research results has succeeded applied to Wuhan Steel Corporation industry port 3# wharf 4 bridge-type grab ship unloaders, to enhances our country harbor bridge-type grab ship unloader electrical control performance, has the certain theory instruction significance and the practical application promotion value.