On-line Thermal Width Adjustment Appropriate for Crystallizer

Abstract

The invention provides an online thermal width adjustment method suitable for crystallizers, which includes a judgment step, a short-distance width adjustment step and a long-distance width adjustment step; it aims at the problems of long width adjustment time and high risk of steel breakout in the prior art , through the method of reasonably selecting the model curve according to the width change before and after the width adjustment, the width adjustment and taper adjustment process can be quickly completed online at one time, which has the advantages of fast and efficient, reasonable taper change, and effectively reduces the risk of breakout.

Description

technical field [0001] The invention relates to the field of crystallizer width adjustment control methods, in particular to an online thermal width adjustment method suitable for crystallizers. Background technique [0002] The crystallizer of the slab continuous casting machine is wide at the top and narrow at the bottom. It is a trapezoidal funnel composed of two wide-side copper plates and two narrow-side copper plates. The distance between the two wide-side copper plates is generally fixed, while the narrow-side copper plates The distance between them is variable, and there is a taper between the two narrow-side copper plates. A cooling water tank is installed on the back of the copper plate. Four push rods are connected, and the two narrow-side water tanks are equipped with a mechanically driven crystallizer width adjustment device. The mechanical width adjustment device is driven by a motor to rotate the screw rod, and the nut on the screw rod is fixed in the push rod...

AI Technical Summary

Problems solved by technology

[0007] However, there are some deficiencies in the above-mentioned existing technologies: the former needs to perform multiple taper transformations to complete a taper adjustment, and once the width before and after the width adjustment changes too much (one side is greater than 100mm), it needs to be repeated several times. In the width adjustment process (A, B, C, D, H, G, F, E), on the one hand, it takes a long time to adjust the width, and on the other hand, there are multiple time points in the width adjustment process where the taper is 0. There is a greater risk of steel breakout in width adjustment; the latter is limited by the limitation of the radian value of a, so that the movement of the narrow side is limited. If the width adjustment amount becomes larger, the radian a at this time cannot meet the target width after one change. At the same time, if the angle a is too large, on the one hand, there is a restriction on the maximum mechanical taper, so that the value of a cannot be too large; on the other hand, if the value of a is not selected properly, the taper of the narrow-side copper plate will increase and cause the risk of steel breakout

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