Automatic tightening device for inner shell

The utility model provides an automatic tightening device for an inner shell, which is used for bolt tightening operation of an inner shell of a combustion chamber of an aero-engine and comprises a base, a workpiece turntable, a movable sliding table, a sliding table support and a tightening rotary head, the movable sliding table is fixed on the base through a bolt, the workpiece turntable is mounted on the base, the movable sliding table is connected with the sliding table support through a bolt, and the tightening rotary head is connected with the workpiece turntable. A telescopic motor is vertically installed at the top end of the sliding table support and connected with a telescopic guide rod through a sleeve, a tightening rotating head is connected with the telescopic guide rod through a bolt, the tightening head is designed to be a replaceable sleeve and can be matched with different sleeves, high-precision tightening operation can be conducted on bolts of different models, the working efficiency is imp