Sluice gate

A sluice gate for opening or closing a discharge port formed in a sidewall of a water reservoir unit which stores water, the sluice gate comprising:

• a hinge unit coupled to a portion above the discharge port on the sidewall of the water reservoir unit;
• a flap gate which is coupled to the hinge unit, vertically rotated around the hinge unit, rotated downward to overlap the sidewall of the water reservoir unit to close the discharge port, and rotated upward to open the discharge port;
• a pull string pulley having a fan-shaped structure coupled to a surface opposite to a surface facing the discharge port among both surfaces of the flap gate when the flap gate closes the discharge port, wherein a guide groove into which the pull string is inserted to guide movement of the pull string is formed on an outer circumferential surface of the pull string pulley;
• a pull string lifting means installed above the water reservoir unit;
• and
• a pull string of which one end is connected to the pull string lifting means, the other end is coupled to the flap gate, and a portion is wound around an outer circumferential surface of the pull string pulley when the flap gate operates to close the discharge port.