Cooling device for hot-dip plated steel sheet

A cooling device for a hot-dip plated steel sheet which is provided on an upper side of a plating thickness control device, including a pair of wiping nozzles, in a conveyance route of the hot-dip plated steel sheet that is conveyed from a plating bath in a vertically upward direction, the cooling device comprising:

• a main cooling device, including a plurality of main cooling gas spraying nozzles, that vertically sprays a main cooling gas to the hot-dip plated steel sheet;
• and
• a preliminary cooling device, including a plurality of preliminary cooling nozzles, that is provided in a preliminary cooling section between the main cooling device and the plating thickness control device in the conveyance route, and sprays a preliminary cooling gas to a plurality of gas collision positions which are set along the preliminary cooling section,
• wherein the preliminary cooling device sprays the preliminary cooling gas to each of the gas collision position in an obliquely upward direction, and
• wherein the closer the gas collision position is to a lower stage of the preliminary cooling section, the smaller an angle, which is made by a spraying direction of the preliminary cooling gas and the conveyance direction of the hot-dip plated steel sheet, becomes.