Membrane aerospace craft deploying and locking mechanism

The invention discloses a membrane aerospace craft deploying and locking mechanism, belonging to the technical field of the aerospace engineering. The membrane aerospace craft deploying and locking mechanism comprises rotational hinge assemblies, side plates I, side plates II, a bottom plate, a top plate and restraining assemblies, wherein a limit plate perpendicular to a plane where the side plate II is arranged is arranged on the side plate II, the bottom plate, the top plate, two opposite side plates I and two opposite side plates II constitute a closed cuboid shell, the side plates I are movably connected with the bottom plate and the top plate by the rotational hinge assemblies, the side plates II are movably connected with the bottom plate and the top plate by the rotational hinge assemblies, the top plate is formed by two slabs through butt-jointing, the butt-jointed ends of two slabs are limited by step-shaped seam allowances, the lower end surface of the top plate pushes against the limit plate of the side plate II, and the upper end surface of the top plate is limited by two restraining assemblies fixed on the top plate. The membrane aerospace craft deploying and locking mechanism is applied to a membrane aerospace craft platform, is integrated with deploying and locking functions, has the characteristics of simple structure, reliable function, small volume and light weight, uses a spring to store energy and does not require an additional energy source.