Design And Development Of Computer Control System Software For Grinding Process

Grinding process is one of the most important procedures in the mineral processing plant. Its main task is to separate the valuable minerals from the discardable gangue after physical grinding and classification, and avail to the subsequent sorting process. On the background of the project of Cangshan concentrator grinding process automation project, which is built in China Steel Group Shandong Mining Co., Ltd., and "intelligent control system for large-scale mill" of national 863 program, the practical application of engineering and scientific is researched, and the grinding process control methods are studied, including control strategy and control algorithm. And the computer control system software design and development of the grinding process is developed, including the production process control system design and development, as well as process monitoring system design and development. In addition, the methods of PID controller parameters based on the optimal evaluation is aslo studied. The main work of this article reads as follows:(1) Combining the grinding process characteristics of Cangshan concentrator, as well as the requirements of process automation control, the grinding process control methods, including process control method and logic interlocking control method is proposed. As for the process loop control method, gather field data and establish charged object model. Controller parameters is based on the method of optimal tuning PID evaluation application. The obtained PID controller parameters are provided with the characteristics of adapting the controlled object. It is a very good guide for the controller parameters on-site testing. The production process of grinding equipment is provided with three interlocking control logic control:the single interlocking control of equipment, the main and back-up switch interlocking control of equipment; the order interlocking control of equipment.(2) Combining the characteristics of grinding process and control requirements, the computer control system software of grinding process is designed, including two parts, the structure and function design of process control system software, as well as the structure and function design of process monitoring system software; at the same time, the two-layer structure of process automation systems is designed, including the process control system and the process monitoring system. The system framework of the specific physical realization is composed of three layers network, including the industrial Ethernet network, control network and equipment network. And then information integration and function integration of computer control system are achieved.(3) Based on the above mentioned strategy, the computer control system software of grinding process is developed, including process control system software development, process monitoring system software development, as well as upper and lower communication software development. Process control system software development is specifically completed programs of process control loop and logic interlocking control program of equipment; process monitoring system software is specifically completed the development of the human-machine interface, including the development of operation management monitoring and the development of system management monitoring; upper and lower communication is specifically completed the achievement of nerwork communication of upper and lower computer.(4) The computer controll system of designed and developed in this paper has been successfully applied to the actual production process of grinding process in Cangshan concentrator. In the engineering applications, the function of process monitoring system software has been fully verified, and a good results of process control system software fuction has been achieved. At the same time, evaluation based on the optimal controller parameter tuning method has provided a useful guide for on-site controller parameters tuning. From the practical operating effects, the system is stable and reliable, flexible to control, easy to operate, lower production costs, reduced operator labor intensity and reached the expectations of the scene.