Hinge and locking device

The utility model discloses a hinge and a locking device, the hinge comprises a first slide block, a connecting rod mechanism, a second slide block and a main shaft block, the first slide block, the connecting rod mechanism and the second slide block are hinged, the connecting rod mechanism comprises a first connecting rod, a second connecting rod and a third connecting rod, and when the first slide block and the second slide block are unfolded and folded, the first connecting rod is connected with the third connecting rod. The hinge point of the second connecting rod in the hollow chute of the third connecting rod slides along the length direction of the hollow chute; when the hinge is completely unfolded, the third connecting rod rotates relative to the main shaft block with the hinge point of the fixed end as the center, so that the unfolding range of the connecting rod mechanism reaches the maximum, and compared with an existing hinge connecting rod mechanism, the unfolding distance of a larger range can