The Study Of The Monitor And Control System On Steam Preservation Based On VB

The quality and production efficiency of concrete components and cement production should be improved with the development of infrastructure construction.Steam preservation kiln is the main equipment for producing concrete component and cement production. Currently, the steam preservation kiln is mainly controled by hand. The manual control mode has lots of shortcomings, such as low precision and bad efficiency. So the manual control mode can't accomplish the task of control and affect the quality of the concrete component and cement production, energy consumption, and the economic benefits of enterprises. Therefore, it has a major practical significance to study the steam preservation monitoring system.On the basis of discussing the application of industrial computer control systems and by analyzing producing process of steam preservation, this thesis presents a monitor and control system on steam preservation based on Microsoft Visual Basic, which can replace current manual control mode. According to the temperature control characteristics, such as time-delay and nonlinear, in steam preservation, the fuzzy parameter self-tuning PID control is used to improve the temperature control precision.Firstly, the thesis presents an overall design plan of the monitor and control system on steam preservation. The control system works by the following steps: the sensor acquires temperature signal from the kiln, the data is sent to Industrial Personal Computer(IPC) by the temperature meter after adjusted, the controller deals with the data and exports a output voltage by D/A card to adjust the flow of the steam, as a result, the temperature of the kiln is automatically controlled.Secondly, the control method in this system is discussed, including the selection of thecontrol method, the design of the fuzzy-PID and the design of the fuzzy-PID controller, it also validates the theory by using Simulink in MATLAB.Finally, the thesis presents the software development of the control system. The control system is analyzed and designed with the object oriented software engineering method. The developing tool is Microsoft Visual Basic 6.0. The user interface is easy to use and the ability of control is powerful. The system can display procedure craft of steam preservation directly, record online parameters, equipment status, the historical parameters of the process, real-time diagnosis and alarm. So the system can implement real-time control of the whole steam preservation.