Automatic tightening equipment for hub variable-pitch bearing

The utility model particularly relates to automatic tightening equipment for a hub variable-pitch bearing. Force arm fixing base, a speed reducer supporting plate is arranged in the middle of the moment arm fixing base; a reducer is arranged in the middle of the upper surface of the reducer supporting plate; a motor is arranged on the left side of the reducer; an electric cylinder supporting plateis arranged in the middle of the lower surface of the reducer supporting plate; an electric cylinder is arranged in the middle of the electric cylinder supporting plate; rotating shafts are arrangedat front ends of push rods of the electric cylinders; a connecting nut is arranged between a push rod of the electric cylinder and the rotating shaft; rotating shaft located inside speed reducer, a flat key is arranged between the rotating shaft and the reducer; a force arm bracket and a force arm supporting plate are fixedly connected above the rotating shaft; the force arm bracket is fixedly connected with the force arm