Anti-deformation foot roll combination device for sector section of large square blank and application method of anti-deformation foot roll combination device

Abstract

The invention discloses an anti-deformation foot roll combination device for a sector section of a large square blank. A through hole penetrates the two ends of a whole center shaft with the center line of the center shaft as the center. The through hole comprises a water inlet and a water outlet. The end, close to the water inlet, of the center shaft is provided with a first end cover board. The end, close to the water outlet, of the center shaft is provided with a second end cover board. A first foot roll, a second foot roll, a third foot roll and a fourth foot roll are sequentially arranged between the first end cover board and the second end cover board in a sleeved manner. A first locating ring is installed at the joint of the first foot roll and the second foot roll. A shaft ring is arranged at the joint of the second foot roll and the third foot roll. A second locating ring is installed at the joint of the third foot roll and the fourth foot roll. The invention further discloses an application method of the anti-deformation foot roll combination device for the sector section of the large square blank. When just delivered out of a crystallizer, a casting blank is guided. The combination device can guarantee that the casting blank can be smoothly guided into the sector section in the continuous casting process and the casting blank cannot be scratched or indented.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to an anti-deformation foot-roll combination device for a sector of a bloom and an application method thereof. Background technique [0002] At present, during the continuous casting process of the continuous casting machine, because the foot roll device works under extremely cold and extremely hot conditions, the foot roll often has bell mouth, bulging belly, and bearing lock, etc., and the shell of the cast slab in this area is relatively thin. This results in scratches and indentations on the surface of the slab. [0003] The foot roll assembly of the sector section of the existing continuous casting machine is mainly composed of a roller with a total length of 471 mm, a shaft with a length of 563 mm and two bearings. The device is lubricated by glycerin to ensure the free rotation of the foot roll, such as figure 1 As shown, the foot roller lubricates the bearings on both si...

AI Technical Summary

Problems solved by technology

After the slab leaves the crystallizer, it enters the fan section (that is, the first roller entering the fan section—foot roll assembly), the slab first touches the foot roll, and the foot roll clings to the surface of the slab to play a guiding role. When the slab enters the fan-shaped section, the surface temperature is extremely high (between 1000-1200°C). In this area, the water nozzle in the fan-shaped section cools the casting slab and also unilaterally cools the upper part of the foot roll assembly. One rotation, the temperature changes greatly, and the foot roll assembly is easily deformed due to the long assembly of the foot roll, resulting in quality defects such as scratches and indentations on the surface of the slab

If scratches or indentations are serious, it will cause the continuous casting single line to stop pouring or the whole stop to replace the foot roll, resulting in increased production costs, decreased number of continuous casting furnaces, reduced steel passing capacity of the continuous casting machine, billet mold repair, and lower grades, etc. Negative effects of the series

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