Hinge and opening and closing device

A hinge 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;

• wherein an outer wall of the cabinet is provided with a mounting cavity recessed towards an interior of the cabinet, and a side of the mounting cavity is provided with a trench, the cabinet is provided with a slot at an end of the trench;
• wherein the hinge comprises:
• a first hinge seat, having a first matching structure;
• a second hinge seat, having a first accommodating cavity extending in a first direction, wherein an end of the first accommodating cavity has a first opening, the first hinge seat and the second hinge seat are provided in the mounting cavity;
• a sliding member, provided in the first accommodating cavity, wherein the sliding member and the second hinge seat are fixed relatively in a circumferential direction of the first accommodating cavity, the sliding member is slidable along the first direction in the first accommodating cavity, and the sliding member has a second matching structure, the second matching structure abuts against the first matching structure;
• and
• an elastic member, provided in the first accommodating cavity and located at an end of the sliding member facing away from the first matching structure, wherein the elastic member applies a thrust to the sliding member to move the sliding member towards the first matching structure;
• wherein the first matching structure has a first curved surface and a first matching surface, the second matching structure has a second curved surface and a second matching surface, the hinge has a first state and a second state, and the first hinge seat is reciprocally rotatable relative to the second hinge seat around an axis extending in the first direction within a predetermined angle range to slide the first matching structure relative to the second matching structure and switch the hinge between the first state and the second state;
• and in the first state, the first matching surface abuts against the second matching surface, and in the second state, the first curved surface abuts against the second curved surface to cause the first hinge seat and the second hinge seat to have a force for relative rotation under the thrust;
• wherein an outer circumferential wall of the sliding member is provided with a first guiding structure extending in the first direction, and the second hinge seat in the first accommodating cavity is provided with a second guiding structure extending in the first direction, the first guiding structure is matched with the second guiding structure to fix the sliding member and the second hinge seat relatively in a circumferential direction of the first accommodating cavity, and to move the sliding member along the first direction;
• wherein the first hinge seat comprises a first lock plate and a first hinge portion, and the first hinge portion comprises the first matching structure;
• wherein the second hinge seat comprises a second lock plate and a second hinge portion, the first accommodating cavity is provided with the second hinge portion, and the second lock plate comprises a first sub-lock plate and is connected to the cabinet;
• wherein the first sub-lock plate is embedded in the trench of the opening and closing device, a raised strip protrudes from an end surface of the second hinge portion away from the first hinge seat and is inserted into the slot, and the slot matches with the raised strip to maintain position of the first sub-lock plate in the cabinet.