Outer hexagonal part screwing device and screwing method

The invention discloses an outer hexagonal part screwing device and a screwing method, which are oriented to the field of spacecraft on-orbit service, and a screwing clamping device comprises a circular shell limiting disc, three clamping rods and three driven rods; the power transmission and control device comprises a driving clamping gear disc, a reset spring, a matched clamping wheel and a limiting base. The screwing method comprises the steps that firstly, the circular shell limiting disc makes contact with an object needing screwing operation; after confirmation, the rotating motor drives the driving clamping gear disc to rotate, and the three sets of clamping rods gradually get close to the screwed object. And secondly, after the three sets of clamping rods clamp the screwed object, a rotating motor stops rotating, a clamping wheel is matched to be meshed with clamping teeth of a driving clamping gear disc under the action of an electromagnet, and the positions of the clamping rods are locked. And third