Vibration monitoring device for main shaft of wind driven generator

The utility model relates to the technical field of wind driven generators, in particular to a vibration monitoring device for a main shaft of a wind driven generator, which comprises a fixing ring arranged on the outer side of the main shaft, an annular sleeve arranged on the outer side of the fixing ring, the main shaft penetrating through the annular sleeve, an annular groove arranged in the annular sleeve, and the fixing ring positioned in the annular groove. A plurality of abutting blocks are installed on the inner wall, away from the main shaft, in the annular groove and arranged in the circumferential direction of the annular groove, and a first displacement sensor is arranged on the side, away from the circle center of the annular sleeve, of each abutting block. The abutting block extrudes the first displacement sensor, the first displacement sensor can detect the offset distance of the fixing ring, and therefore the maximum offset distance of the main shaft can be judged, radial vibration of the main