Hinge device and fixing component thereof

The utility model provides a hinge device and a fixing component thereof. The fixing component is arranged at the end part of one pivot of the hinge device and comprises a fixed plate and a screw cap,wherein the fixed plate is sheathed and fixed on the pivot and the screw cap is assembled at the end part of the pivot; the side surfaces of the fixed plate, corresponding to the screw cap, are surrounded to respectively form a ratchet surface; the ratchet surfaces can be clamped relatively; by the design, the screw cap can only rotates around the fixed plate in the direction of compressing all components of the hinge device, can be avoided moving towards the axial direction of the external side of the pivot, thus achieving the object of preventing relative loosening of all components of thehinge device and keeping the torsion and using effect of the hinge device; furthermore, when the screw cap rotates around the fixed plate by a ratchet, all components of the hinge device are compressed further; therefore, the