A nested coil crystallizer electromagnetic stirrer

Abstract

The invention discloses a nested coil crystallizer electromagnetic stirrer, which comprises an annular yoke and a plurality of rotating magnetic field generating devices. Three pairs of rotating magnetic field generating devices are installed on the inner wall of the annular yoke in a circumferential shape. The rotating magnetic field generating device includes first, second, and third rotating magnetic field generating devices: the iron core of the first rotating magnetic field generating device is located in the middle of the annular yoke, and the first rotating magnetic field coil is wound around the first rotating magnetic field core. Four sides; the iron core of the second rotating magnetic field generating device is composed of two upper and lower side plate iron cores respectively located in the first rotating magnetic field iron core, keeping a certain distance from the first rotating magnetic field iron core and wider than the first rotating magnetic field For the iron core, the second rotating magnetic field coil is wound around four sides of the corresponding iron core; the third rotating magnetic field generating device is arranged by analogy. The invention utilizes the superposition of multiple rotating magnetic fields to improve defects caused by inclusions and the like in the production process of casting slabs and improve the quality of steel slabs.

Description

technical field [0001] The invention relates to the technical field of iron and steel continuous casting equipment, in particular to an electromagnetic stirrer for a nested coil crystallizer. Background technique [0002] With the rapid development of modern industry, various industries have higher and higher requirements for steel quality. Therefore, electromagnetic stirring technology is widely used in continuous casting production. At present, electromagnetic stirrer has become a high-efficiency continuous casting, and it is necessary to obtain high-quality casting slabs. few links. The essence of electromagnetic stirring is to strengthen the movement of molten steel in the liquid phase cavity by means of the electromagnetic force induced by the electromagnetic field in the liquid phase cavity, thereby strengthening the convection, heat transfer and mass transfer process of the molten steel, resulting in inhibiting the development of columnar crystals and promoting compos...

AI Technical Summary

Problems solved by technology

In the process of continuous casting of blooms, it is easy to generate flow dead zones at the corners of the billet, causing defects in the casting slab, and the excessive flow rate of the submerged nozzle will impact the initial solidification shell of the slab, and also hinder non-metallic inclusions Floating, seriously affecting the quality of the slab

[0004] At present, most of the mold electromagnetic stirrers in industrial continuous casting production are conventional electromagnetic stirrers, and the rotating magnetic field liquid generated by them is used for horizontal stirring, so that the temperature distribution of molten steel in the mold is more uniform, the equiaxed crystal rate is increased, and segregation is reduced. However, the stirring of the corner of the billet by the rotating magnetic field currently used is still not satisfactory, and it is necessary to improve the electromagnetic stirrer of the crystallizer

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