| This paper takes the 90 t converter in the steel plant of the Limited by Share Ltd as the research object, and analyzes the process and parameters of the converter oxygen lance. The action contents of the converter oxygen lance in each point were determined. Design the automatic control program of oxygen lance. The range and speed and acceleration of the working process of the oxygen lance in the corresponding operating range.The overall design of the control part of the converter oxygen lance is carried out. DC speed adjustment device is selected SIEMENS 6RA70. The parameters of DC speed adjusting device set, internal rectifier DC speed regulating device to protect the converter oxygen lance lifting gun motor armature voltage and current protection, excitation current, and the motor speed is too high to prevent motor burning.The parameters of converter production and safety are determined by the research. Then, the data obtained from the relevant theory and field practice, the range and the value of the parameters are determined. Step7 programming software programming the PLC, combined with on-site operation and human-computer interaction system WINCC, real-time fault alarm, when the actual value exceeds the detection limit values of the parameters, automatic or automatic stop up the gun, to protect the safety of equipment of converter.The design of oxygen lance is quick to stop. When the converter oxygen lance system occurs, it can not stop. Design the control circuit of the converter accident. The system for the oxygen gun system for oxygen gun B, A sets of two circuits design. The circuit of switching power supply is designed in the accident state. When the main circuit of the oxygen lance or DC speed regulating device, the main contact can not act, then can start the accident to carry a gun, the oxygen lance. PLC is designed for the direct control of the oxygen gun, and the control of the PLC is avoided. |
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