Three-jaw type space butt-joint locking mechanism capable of automatically and linearly plugging and unplugging

The invention provides a three-jaw space docking locking mechanism capable of automatically and linearly plugging and unplugging, and belongs to the field of on-orbit service of spacecrafts. The mechanism comprises a capturing inner shell, a clamping jaw outer shell, a clamping jaw, a clamping jaw seat, a driving gear, a spring, an end cover and a bearing ball. The driven end is captured through the large capturing range of the clamping jaw, the pull-back insertion and push-out unlocking process of the driven end can be achieved under the condition that assistance of a mechanical arm is not needed, the clamping jaw is limited ingeniously through the positioning rod, and the structure is simpler and more reliable. The invention provides a design scheme of a small space docking mechanism capable of automatically pulling back, inserting, locking and unlocking, and a mounting space is reserved in the middle of the mechanism and can be integrated with other connectors for use, so that the whole mechanism is more c