Dynamic control method for electromagnetic braking device of crystallizer

Abstract

The invention belongs to the technical field of ferrous metallurgy continuous casting, and particularly relates to a dynamic control method for an electromagnetic braking device of a crystallizer. The method is on the basis of a continuous casting programmable control system, an OPC (Ole for Process Control) process control system and a client. The method is characterized in that an electromagnetic braking second-level interrupting control system is arranged and communicated with the continuous casting programmable control system through the OPC process control system; the electromagnetic braking second-level interrupting control system comprises a magnetic field interrupting module and a decelerating module; and once the electromagnetic braking device is stopped, the decelerating module is used for controlling the electromagnetic braking current according to a sine basis wave function. Compared with the prior art, the dynamic control method has the beneficial effects that 1) the stability of the electromagnetic braking device in running is higher; 2) the electromagnetic braking device can be automatically stopped once abnormal conditions occur, so that the accident can be prevented from spreading caused by inaccurate artificial judgment or failing to close in time; and 3) the most reasonable gradient of the current in an interval in which the inertia force and the lorentz force are balanced is ensured, so that the time for stopping is reduced, and the smooth transition among the declining curves is ensured.

Description

technical field [0001] The invention belongs to the technical field of continuous casting of iron and steel metallurgy, and in particular relates to a dynamic control method of an electromagnetic brake device of a crystallizer. Background technique [0002] Reasonable use of mold electromagnetic braking technology on slab continuous casting machines can significantly improve the surface quality of steel, increase casting speed and production efficiency. Entrainment, but also spread the mold powder evenly, thereby reducing the surface cracks of the slab. And by reducing the downward speed and impact depth of the stream, it is beneficial to reduce the inclusions inside the slab, promote the uniform growth of the slab shell, and greatly reduce the risk of breakouts and corner cracks. This has been practiced by many steel mills at home and abroad. confirmed. [0003] At present, the electromagnetic braking devices used at home and abroad are all manually controlled. The stop m...

AI Technical Summary

Problems solved by technology

Judging from the use of manual control of the electromagnetic brake in production, when the electromagnetic brake is turned off, the moment the stop button is clicked directly will cause a sudden tumbling of the liquid level, which can easily cause a steel leak alarm

In addition, when a sudden accident occurs on the continuous casting site, it is often too late to turn off the power supply, causing the accident to expand, and it cannot be turned on automatically when the process is ready for use, resulting in production lag

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