Sewage discharge device for sedimentation tank

The utility model belongs to the technical field of blowdown devices, and particularly relates to a sedimentation tank blowdown device which comprises a tank body, a motor is mounted on one side of the outer wall of the bottom end of the pool body, and a ball screw is fixedly connected to the output end of the motor; the ball screw and screw nut pair is connected with a scraper, and the two ends of the scraper are in sliding connection with the two sides of the inner wall of the pool body; one end of the ball screw is rotationally connected with a rotating rod and a connecting rod through a bevel gear set. The output end of the motor positively and negatively drives the ball screw to rotate, then the scraper is driven to reciprocate in the tank body, sludge accumulated at one end in the tank body is pushed to the middle of the tank body, and the sludge is conveniently pumped by the sludge suction pump, and the ball screw can drive the connecting rod to rotate through the bevel gear set, so that the connecting