Lifting appliance for annular piece

The invention discloses a lifting appliance for an annular piece, and relates to the technical field of lifting appliances, the lifting appliance comprises a fixing plate, a sliding rod and a clamping jaw assembly, the fixing plate is provided with a supporting frame, when a lifting chain is in a tensioning state, under the action of gravity, a driving block on the sliding rod drives a clamping jaw to move, and the lower end of the clamping jaw clamps the annular piece; when the lifting chain is in a loose state, under the action of the elastic force of the spring and the tension of the tension spring, the clamping jaw is driven to move towards the inner side of the fixing plate, so that the clamping jaw is separated from the annular piece, only the tensioning or loosening state of the lifting chain needs to be controlled in the whole process, the annular piece is clamped or loosened through the clamping jaw, and additional complex electrical equipment is not needed for assistance; and the operation process i