Cooling system and cooling method of rolling steel

B - Operations – Transporting – 21 – B

Patent

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Details

B21B 45/02 (2006.01) C21D 1/00 (2006.01) C21D 8/00 (2006.01) C21D 9/04 (2006.01)

Patent

CA 2715320

A cooling system that cools hot rolled long steel bar, provided with a plurality of chambers that are arranged along the longitudinal direction of the rolled steel bar. Each of the plurality of chambers is provided with a blow outlet that, facing from the chamber to the rolled steel bar, blows out compressed air for cooling that is introduced to the chamber from a gas inlet that is connected to the chamber; a nozzle plate having a plurality of nozzle holes that is provided at this blow outlet so as to face the rolled steel bar; a cooling water supply nozzle that supplies cooling water into the chamber; and a rectifying plate that is provided between the gas inlet and the cooling water supply nozzle, and that prevents the compressed gas for cooling that is introduced from the gas inlet from directly striking the nozzle plate. The cooling system of the present invention sprays a cooling medium that is produced by mixing the cooling water that is supplied from the cooling water supply nozzle and the compressed gas for cooling that is introduced from the gas inlet and rectified by the rectifying plate toward the rolled steel bar through the nozzle holes of the nozzle plate, and performs uniform cooling of the surfaces of the rolled steel bar.

L'invention concerne un système de refroidissement d'acier laminé pour refroidir un acier laminé à chaud allongé, comprenant une pluralité de chambres disposées le long de la direction longitudinale de l'acier laminé. La pluralité de chambres sont dotées, respectivement, d'une sortie d'air alimentant l'air comprimé de refroidissement introduit dans la chambre depuis une entrée de gaz vers l'acier laminé, une plaque de buses comprenant une pluralité de trous de buses disposés à la sortie d'air pour être orientés face à l'acier laminé, une buse d'alimentation en eau de refroidissement pour alimenter en eau de refroidissement la chambre, et une plaque d'égalisation disposée entre l'entrée de gaz et la buse d'alimentation en eau de refroidissement, afin d'empêcher l'air comprimé de refroidissement, introduit depuis l'entrée de gaz, de frapper directement la plaque de buses. Le système de refroidissement pulvérise le fluide de refroidissement produit en mélangeant l'eau de refroidissement fournie depuis la buse d'alimentation en eau de refroidissement et l'air comprimé de refroidissement introduit depuis une entrée de gaz vers l'acier laminé, par l'intermédiaire des trous de buses de la plaque de buses, refroidissant ainsi la surface de l'acier laminé de façon uniforme.

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