Rotating mechanism and head-mounted display apparatus

A rotating mechanism, comprising:

• a stationary component;
• a rotating component rotatablely connected to the stationary component, wherein one of the stationary component and the rotating component is provided with at least one group of clamping grooves, and each group of clamping grooves includes a plurality of clamping grooves that are consecutively arranged in a rotation direction of the rotating component;
• and
• at least one elastic clamping block disposed on another one of the stationary component and the rotating component, the at least one elastic clamping block being in one-to-one correspondence with the at least one group of clamping grooves, wherein
• each elastic clamping block is configured to be capable of being matched with any clamping groove of a plurality of clamping grooves included in a corresponding group of clamping grooves, and to be capable of being elastically deformed in a direction away from the clamping groove under a squeezing action of an inner surface of the clamping groove, so as to slide out of the clamping groove.