Turnover mechanism capable of achieving fixed welding at all angles

The utility model discloses a turnover mechanism capable of achieving fixed welding at all angles, and is applied to the field of machining. By treading the pedal to enable the connecting rod to drive the rack column to move downwards, the rack column moves downwards to enable the rack column and the fluted disc to be disengaged from clamping, then the rotary disc is rotated to rotate the workpiece to the needed position, the pedal is loosened, the rack column is clamped with the fluted disc under the action of the first spring, and the angle of the workpiece is fixed, so that the function of overturning at all angles can be achieved; by moving a pull head, the pull head moves to drive a clamping rod to move, the clamping rod moves to enable the clamping rod to be disengaged from a clamping hole in the surface of a sliding column, then the sliding column is moved to a needed position, the clamping rod is loosened, and the clamping rod is clamped with the clamping hole under the action of a second spring; and