Center positioning device of main shaft of water-turbine generator set

The utility model discloses a center positioning device of a main shaft of a water-turbine generator set, and belongs to the technical field of generators. A center positioning device of a main shaft of a water-turbine generator set comprises a generator, the main shaft on the generator and a positioning seat, and further comprises a cylinder arranged on the outer wall of the main shaft in a sleeving mode; the bearing is fixedly mounted on the outer wall of the main shaft; the plurality of positioning rods are fixedly connected to the generator, and the plurality of positioning rods are circumferentially distributed on the periphery of the main shaft; the supporting column is fixedly connected to the lower end of the cylinder, and the supporting column is connected with the positioning seat through a fixing mechanism; the threaded holes are uniformly distributed in the circumferential outer wall of the cylinder; the arc-shaped plates are connected with the cylinder through buffer mechanisms; according to the