Research On And Design For Computerized Control System Of Extrusion Machinery

According to the demand of farm produce process lab of Northeast Agricultural University, which requires improving electromotor speed and temperature control and monitoring, based studying the existed equipments, a set of computer control system is described in this thesis.This system provides precise control and process monitoring, in which the temperature in different area and the pressure in head of machine can be controlled automatically by the computer.At first, this thesis studies the hardware. The circuit diagrams are shown. The emphasis is about the design for microcontroller control circuit. In experience, that the magnified analog signals can be used as control voltage has been proved. So, with micocontroller , the electromotor soft startup can be reached easily.Then, this thesis devises the software of MCS-51 microcontroller and PC. The main content is about the communication between PC and microcontrollers.This host service system is interfaced with the RS-422 technology. The PC is the center of the communication system. The program is composed by many standard modules. Its recipe management includes all setpoints for storage and retrieval of data. Datalogging and analyses are stored on disk.The circuit diagrams and program can be used for maintenance and more improvement.Postgraduate: Yu ChaogangMajor: Agricultural electrization and automatization Tutor: Prof. Ouyang Binlin...