Control system and method for dynamic load distribution for round billet continuous casting withdrawing-straightening motors

Abstract

The present invention relates to a control system and method for dynamic load distribution for round billet continuous casting withdrawing-straightening motors. The system comprises an industrial personal computer, a PLC controller serving as a master station, a plurality of frequency transformers serving as slave stations, a plurality of DC speed adjusting transmission devices, and a plurality of round billet continuous casting withdrawing-straightening motors. The industrial personal computer is connected to the PLC controller by means of a network. The PLC controller is connected to the plurality of frequency transformers by means of a field bus. All the frequency transformers are in one-to-one communication connection with all the DC speed adjusting transmission devices. The DC speed adjusting transmission devices are in one-to-one communication connection with the round billet continuous casting withdrawing-straightening motors to perform variable frequency speed adjusting control on the withdrawing-straightening motors. The system is simple in structure, convenient to operate, easy to implement, and capable of effectively reducing the times of shutdown of the frequency transformers due to failures and the time of system startup / shutdown; thus, the fluctuation of the liquid level of a crystallizer is effectively reduced with prolonged service life of continuous casting equipment and improved surface quality of casting billets.

Description

technical field [0001] The invention relates to the technical field of the control of the drawing and leveling motors for continuous casting of large-section round billets in steelmaking, in particular to a method for dynamically distributing the loads of multiple drawing and leveling motors during the billet production process to avoid long-term maintenance of some motors. A load dynamic distribution and speed adjustment control system and control method for round billet continuous casting drawing and leveling motors working under overload while other motors are in no-load or regenerative power generation state. Background technique [0002] In the steelmaking workshop, the tension leveler is the key equipment in the process of continuous casting of steel billets. It has the functions of breaking scale, stretching, bending and straightening billets. For the large-section round billet continuous casting tension-leveling motor control system, in addition to the technical char...

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to dynamically distribute the loads of multiple stretching and straightening motors used in the round billet continuous casting process, so as to avoid some motors working under overload for a long time, causing the frequency converter to report failure while others are in no-load or regenerative power generation state, which will cause the equipment to fail It is damaged before reaching the working life and causes mold liquid level fluctuations during the failure of the tension-leveling motor, which seriously affects the surface quality of the slab. adverse effect on quality requirements

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