Fault-tolerant control device and method for non-sinusoidal oscillation of continuous casting crystallizer driven by servo motor

Abstract

The invention discloses a fault-tolerant control device and method for non-sinusoidal oscillation of a continuous casting crystallizer driven by a servo motor, and belongs to the field of continuous casting. The fault-tolerant control device is composed of an upper computer monitoring system, a high-performance programmable logic controller, a servo controller, a driver, a servo motor, a speed reducer, an eccentric shaft connecting rod mechanism, a crystallizer vibrating table, the crystallizer on the crystallizer vibrating table, and a displacement sensor. The non-sinusoidal oscillation waveforms of the crystallizer are adjusted automatically along with the change of the casting speed. According to the method, the oscillation displacement of the crystallizer is detected by the displacement sensor, the rotation speed of the servo motor is switched when the oscillation displacement of the crystallizer passes through the null point, and smooth switching between the different oscillation waveforms of the crystallizer is achieved; the fault of the displacement sensor is diagnosed automatically, the fault-tolerant control mode without the displacement sensor is quickly when the displacement sensor fails, and real-time smooth switching of the oscillation waveforms is achieved by automatically adjusting the rotation speed of the servo motor; and after the fault of the displacement sensor is eliminated, the non-sinusoidal oscillation mode is started through switching.

Description

technical field [0001] The invention belongs to the field of continuous casting, and in particular relates to a fault-tolerant control device and method for non-sinusoidal vibration of a continuous casting mold driven by a servo motor. Background technique [0002] The continuous casting mold is the key equipment in the continuous casting production. The non-sinusoidal vibration of the continuous casting mold plays an important role in improving the quality of the slab and increasing the casting speed. It has been recognized as one of the key technologies for the development of high-efficiency continuous casting. The non-sinusoidal vibration devices of continuous casting molds used in industry are mainly divided into three types: hydraulic drive, mechanical drive, and servo electric cylinder drive. The non-sinusoidal vibration generator of the continuous casting mold commonly used at home and abroad is driven by an electro-hydraulic servo system, which can realize waveform s...

AI Technical Summary

Problems solved by technology

[0004] However, the displacement sensor may fail when it works in the harsh environment of high temperature, humidity and high dust in the industrial field, and the non-sinusoidal vibration displacement of the crystallizer and the smooth switching between different waveforms of different speeds require the measurement of the vibration displacement of the crystallizer collected by the displacement sensor Therefore, the failure of the displacement sensor will cause the non-sinusoidal vibration displacement or velocity waveform of the mold to be switched in real time and smoothly, and the vibration waveform of the mold cannot be automatically adjusted with the change of casting speed. Therefore, it will not only affect the quality of the slab, but also may cause production abnormalities and even production accidents such as breakouts

But, also do not have control device and method to be able to solve the above problems at present

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