The central drive sludge scraper is suitable for mechanical sewage discharge in radial flow or vertical flow sedimentation tanks (<20m) without central piers. The machine is equipped with a fixed platform across the pool, and the entire machine load acts on the center of the working bridge during operation. The sewage flows evenly around the pool through the diversion tube in the center of the pool. As the flow rate decreases, the suspended matter in the sewage settles at the bottom of the pool. The bottom scraper scrapes the sedimented sludge into the central mud pit, and uses hydrostatic pressure to remove it from the pool. discharged from the sludge pipe.