GNZ type central drive thickener is generally suitable for occasions where the diameter of the pool is greater than 30 meters, the requirements for clarification are high, the sludge proportion is large, the settling is fast and it is easy to harden. The transmission device has multiple (2~4) drive units, and the gear bearing with internal teeth is a precise multi-point contact type slewing bearing, which is connected with the center cage sleeved outside the center column through the flange, the internal gear ring, and drives the rake. The machine works, and the transmission device is installed on the top of the machined steel pipe column, which can ensure the precise transmission between the gears to ensure sufficient transmission torque.