COOLING DEVICE AND COOLING METHOD FOR HOT ROLLED STEEL SHEET

To provide a cooling device and cooling method for a hot rolled steel sheet, enabling a lower surface of a hot rolled steel sheet after finish rolling in a hot rolling step to be properly cooled.SOLUTION: A cooling device for a hot rolled steel sheet is provided which cools a lower surface of a hot rolled steel sheet conveyed on a conveyance roll of a run-out table after finish rolling in a hot rolling step, the cooling device comprises: a plurality of cooling water nozzles which are arranged side by side in a plate width direction of the run-out table between the adjacent conveyance rolls and jet the cooling water to the lower surface of the hot rolled steel sheet; and a cooling water quantity control mechanism which controls the flow volume of the cooling water jetted from the cooling water nozzles. The cooling water quantity control mechanism comprises: a shielding unit which has a plurality of shielding plates provided above the plurality of cooling water nozzles and forming a flow channel of the cooling water; an opening adjustment unit which has a drive shaft extending along the plate width direction of the run-out table and adjusting the opening of the shielding unit; and a power transmission unit which is connected to the lower portion of the shielding unit and transmits the power of the opening adjustment unit to the shielding unit.SELECTED DRAWING: Figure 3 【課題】熱間圧延工程の仕上圧延後の熱延鋼板の下面の冷却を適切に行うことが可能な熱延鋼板の冷却装置および冷却方法を提供する。【解決手段】熱間圧延工程の仕上圧延後に、ランアウトテーブルの搬送ロール上を搬送される熱延鋼板の下面を冷却する熱延鋼板の冷却装置であって、隣接する前記搬送ロール間において前記ランアウトテーブルの板幅方向に並んで設けられ、前記熱延鋼板の下面に冷却水を噴射する複数の冷却水ノズルと、前記冷却水ノズルのから噴射された冷却水の流量を制御する冷却水量制御機構と、を備え、前記冷却水量制御機構は、複数の前記冷却水ノズルのそれぞれの上方に設けられ、前記冷却水の流路を形成する複数の遮蔽板を有する遮蔽部と、前記ランアウトテーブルの板幅方向に沿って延設され、前記遮蔽部の開度を調節する駆動軸を有する開度調節部と、前記遮蔽部の下方に接続され、前記開度調節部の動力を前記遮蔽部に伝達する動力伝達部と、を備える。【選択図】図３