The Design And Realization Of A Monitoring And Control System For Series â…¢ Dense Phase Conveying

The series III dense phase conveying system in electrolysis aluminum factory, acted as series III electrolysis material supply system, play a very important role in product line. Its running states will directly have effect on the quantity and quality of the production. Several reasons lead to system communication failure occurs frequently, such as the technique backwardness, system maintenance problem due to unopened source code, and no spare sample and spare part. The dense phase conveying system, borrowed from abroad in 1992, could not meet the need of production at present, which became the grave hidden trouble in electrolysis aluminum production. Furthermore, the original monitoring system provided by Swiss ALESA Aluminum Company, with menu operation interfaces in English, is now lagged behind modern technique. Its human machine interface was unfriendly and too simple in function. It provided so limited information that couldn't fully reflect dense phase conveying technique and device status on spot; the monitoring system run so slowly that couldn't reflect transportation technique process state in time. So the field operator could not timely, accurately and roundly find out dense phase conveying technical process, stuff transportation case and device status. Not even to deal with the problems and devices failure occurred in production. A monitoring and control system for the Guizhou Electrolysis Aluminum Plants is designed in this dissertation, based on the delicate investigation and research work for its series III dense phase conveying system and analyzing and summarizing lots of literatures. The control strategy is investigated and shown good control effects in simulation and experiments. In addition, developing process of the monitoring and control system software for the upper computer, based on WinCC platform, is detailedly introduced. The software takes full account of the user's demand. Therefore, it has great robustness and good control effects and is easy to operate and maintained. The main content of this dissertation include the followings: 1. A summarization of current technical status and development trend of the industrial automation technology ; The aim and meaning of this research dissertation; more stresses are put on the hardware and software design scheme. 2. Characteristic and function of WinCC software. 3. The design and realization of the monitoring and control system based on WinCC software. Siemens WinCC5.0 is chosen as the developing platform, which can run under Windows2000 system. The system software design work for the upper computer of dense phase conveying system is demonstrated in detail. Lastly, the key difficulties during development are discussed and the solutions concerned are given. To summary, a monitoring and control system is implemented at less investment by adopting WinCC developing platform. It has successfully solved the slow communication speed problem and the laggardness of the techniques with the former one. It proved this customer-oriented system can meet the real time monitoring and network extension demand of dense phase conveyingt system to the most extent. It has a notable practical application meaning.