Hinge assembly and opening and closing device

A hinge assembly configured to be used in an opening and closing device, the opening and closing device comprising a cabinet and a door body, the cabinet having an opening, the door body hinged to the opening of the cabinet through the hinge assembly:

• wherein the hinge assembly comprises:
• a first matching member provided in the door body, and provided with a first curved surface and a second curved surface at one end of the first matching member;
• a second matching member provided in the cabinet, and provided with a third curved surface and a fourth curved surface at one end of the second matching member;
• and
• an elastic member located at a side of the second matching member away from the first matching member;
• wherein
• the elastic member applies the axial force to the second matching member and the first matching member;
• the hinge assembly has a first state and a second state, and the first matching member and the second matching member are rotatable relative to each other around a first axis to be switchable between the first state and the second state;
• and in the first state, the door body is open, and the first curved surface abuts against and is matched with the third curved surface to make the first matching member and the second matching member have a first acting force under an axial force, the first acting force having opposite direction as gravity;
• and in the second state, the door body is close, and the second curved surface abuts against and is matched with the fourth curved surface to make the first matching member and the second matching member have a second acting force under the axial force, the second acting force having same direction as gravity;
• the door body is configured to suspend in the first state;
• the second matching member has a stop surface connected to an end of the fourth curved surface and extends to the first matching member;
• and
• when the door body rotates until the first matching member and the second matching member are in the second state, the stop surface is configured to match with the first curved surface to limit the first matching member from continuing to rotate towards direction of closing the door body.