Water decanter weir crest structure

The utility model discloses a weir crest structure of a decanter. The weir crest structure comprises a weir crest main body part, a rotary supporting part and a driving device part, the weir crest main body part comprises a plurality of same water guide pipes; a water collecting tank is arranged at the top of the water guide pipe; the two ends of the water collecting tank are rotationally connected with rotating frames correspondingly. A buoy is fixedly connected between the rotating frames, a motor cover is fixedly connected to the side, close to the water collecting tank, of the top of the water guiding pipe, a driving motor is arranged in the motor cover, a transmission gear is fixedly connected to an output shaft of the driving motor, and a threaded rod is connected to the transmissiongear in an engaged mode. According to the utility model, the structure is simple, the transmission gear is driven to rotate by a driving motor in the motor cover; the transmission gear drives the threaded rod to rotate so as