The present invention relates to a floodgate device for a reservoir, which stably opens and closes a floodgate and enables a user to check an opened and closed state of the floodgate. The floodgate device for a reservoir includes: a floodgate guide body having an opening and closing hole in the vertical direction; an opening and closing door opening and closing the opening and closing hole by being installed on the upper surface of the floodgate guide body to slide; a connection shaft connected to one side of the opening and closing door; a driving body having an opening and closing recognition slit penetrated on one side of the driving body in the longitudinal direction; a driving screw inserted into the driving body to rotate around an axis and having a screw unit on the outer surface; a connection block of a ring cross section shape, which is screwed to the outer side of the driving screw to be arranged between the driving screw and the driving body and sliding forward and backward in the axial direction on the driving screw in accordance with a rotational direction of the driving screw; a forward and backward moving shaft connecting the connection block and the connection shaft and transmitting a moving force of the connection block to the connection shaft; an opening and closing recognition bar recognizing opening and closing of the opening and closing door while moving to correspond to a movement of the connection block, wherein one end is connected to one side of the connection block and the other end is installed to protrude from the outer side of the driving body through the opening and closing recognition slit; a barrel-shaped protective cover inserted into and connected to the outer side of the driving body to enclose the opening and closing recognition bar and the opening and closing recognition slit and preventing foreign substances from flowing into the opening and closing recognition slit, wherein the protective cover protects the opening and closing recognition bar; and a handle unit connected to the driving screw and enabling a worker to manually rotate the handle unit. The protective cover is made of a transparent material.

본 발명은, 상하방향으로 개폐공이 형성된 수문가이드몸체, 수문가이드몸체 상면에 슬라이딩 가능하게 설치되어, 개폐공을 개폐시키는 개폐문, 개폐문의 일측에 연결 결합되는 연결축, 일측에는 길이방향으로 개폐인지슬릿이 관통 형성된 구동몸체, 구동몸체 내측에 축회전 가능하게 삽입 설치되며, 외측면에는 나사부가 형성된 구동스크류, 구동스크류와 구동몸체 사이에 배치되도록 구동스크류 외측에 나사 결합되어, 구동스크류의 회전방향에 따라 구동스크류 상에서 축방향으로 전후 슬라이딩 이동하게 되는 링 단면형상의 연결블럭, 연결블럭과 연결축을 연결하여, 연결블럭의 이동력을 연결축으로 전달하는 전후이동축, 일단이 연결블럭 일측에 연결 결합된 상태로 타단은 개폐인지슬릿을 통해 구동몸체 외측으로 돌출되도록 배치되어, 연결블럭의 이동에 대응되게 이동하면서 개폐문의 개폐정도를 인지할 수 있게 하는 개폐인지바, 개폐인지바와 개폐인지슬릿을 감싸도록 구동몸체 외측에 삽입 결합되어, 개폐인지바를 보호함과 더불어 개폐인지슬릿으로 이물질이 유입되는 것을 차단시키는 통 형상의 보호커버, 구동스크류에 연결되어, 작업자가 수동으로 회전시킬 수 있게 하는 핸들부를 포함하며, 보호커버는 투명재질로 이루어진 수원지용 수문장치를 제공한다.