The Research & Design Of The Control System Of The Wire&Cable Extrusion Line Based On Field Bus

The trade of wire and cable is an important industry in the economic construction of our country, it is closely related to every walk of life of national economy and even world economic development. The research and development of its equipment making technology is important to improve our industry of wire and cable.The current situation of the trade of wire and cable is analyzed both at home and abroad at first, and find out the reason why the gap of manufacturing technology of equipment between our country and of foreign countries. The greatest shortage of the industry of equipment manufacturing is the lag of advanced automatic technology's practical implementation in industry control systems. Combine a actual project , the thesis introduce a control system of equipment based on the PROFIBUS field bus technology, and design the control system of the low-voltage wire and cable of automobile. At the first , the technology of polymer extrusion has been analyzed in detail. The equation about the relation between flow rate and rev of extrusion machine has been deduced based on the theory of fluid mechanics. Then the diameter control method is discussed. In this thesis the method of controlling the cold and hot diameter has been designed, the hot diameter is acted as feedback, and the set point of hot diameter is updated according to the difference between cold measuring diameter and set value. And the PID controller based on the fuzzy self adjust of the controller's parameters has been adopted. The effect has been proved in production, the structure of two single layer network is designed based on the PROFIBUS field bus technology. The design and configuration method of the field bus network has been analyzed in detail, and the design method has been introduced, the procedure design methods have also been analyzed in detail, such as the technology of multilayer programming, the technology of the codes of dealt with the mistake and the codes implementation technique, etc.The performance of network and system running result that come into being in experiment indicate the effectivity and practicality of the method. The hardware and software have been implemented in many production lines.