Abstract: A fixing belt adjusting mechanism and a wearable device are provided. The fixing belt adjusting mechanism includes a fixing base, a ratchet wheel, a driving member, a knob, a reset piece and a transmission wheel. The driving member may be rotated by the knob, so that a pawl drives the ratchet wheel to rotate in a first direction. Both ends of the reset piece are respectively connected with the fixing base and the ratchet wheel, so that the ratchet wheel may be driven to rotate and reset in a second direction. The transmission wheel coaxially and fixedly connected with the ratchet wheel may drive a first fixing belt and a second fixing belt to move towards or away from each other through rotation. Therefore, the fixing belt adjusting mechanism may achieve the effect of synchronously adjusting two fixing belts using a simple structure, which facilitates improving the user experience.

Abstract: Embodiments of the present disclosure disclose a protection apparatus, where a protection shell and a protected member are locked by using a first locking part and a second locking part respectively, and the unlocking of the first locking part is controlled by the second locking part by means of a sensor and a controller. Thus, multiple protection of the protected member is achieved by using the first locking part and the second locking part, and a protection effect on the protected member is improved. Meanwhile, when the second locking part unlocks the protection shell during the removal stage of the protected member, the first locking part also unlocks the protected member at the same time, thereby simplifying operation steps of removing the protected member.