Mechanical control surface folding and unfolding mechanism, using method and flight device

The invention discloses a mechanical control surface folding and unfolding mechanism, a using method and a flight device, and relates to the technical field of high-overload-resistant steering engines. The technical problems that an existing unfolding mechanism is large in component size, complex in structure and incapable of meeting the launching mechanical environment of the steering engines are solved. Rudder shafts, control surfaces and elastic recovery assemblies are all multiple, the rudder shafts are evenly installed on the peripheral side of a shell, the control surfaces are hinged to the ends, away from the shell, of the rudder shafts, and the elastic recovery assemblies are installed in cavities in the middles of the rudder shafts; a connecting rod is installed on the shell through guide rods and is fixed through a shear pin, a first return spring is installed on the connecting rod, abuts against the shell and is in a compressed state, in unfolding state, a limiting column at the tail end of the con