Spindle bearing clearance eliminating device of wind generating set

The utility model relates to a clearance eliminating device for a main shaft bearing of a wind generating set, which is characterized in that a main shaft operation support for hot charging is arranged below a main shaft flange, a main shaft impeller positioning disc is arranged above the main shaft flange, and a tensioning flange is arranged on the upper end surface of the main shaft bearing; a plurality of groups of tensioning devices which are uniformly distributed along the circumference of the central axis are arranged between the tensioning flange and the main shaft impeller positioning disc, and in the natural cooling process that a bearing is sleeved on a main shaft shoulder of the main shaft after being heated, a hydraulic power source is used for providing power for a hollow double-acting oil cylinder mounted on the tensioning flange; the hollow double-acting oil cylinder outputs a consistent load effect, so that the tensioning flange mounted on the upper end face of the bearing inner ring and the l