Fuse appliance

A fuse appliance, comprising a fuse, a fuse carrier made of insulating material and a fuse appliance base made of insulating material, the fuse carrier being arranged in a cavity for receiving the fuse, moving contacts of the fuse appliance being arranged on the two sides of the cavity, the fuse carrier being arranged, in a manually operable way, in a hollow cavity of the fuse appliance base that is formed by buckling and assembling a shell bottom and a shell cover, so as to remove or insert the fuse when the fuse is replaced by an operator, and fixed contacts and wiring terminals arranged on the two sides of the fuse appliance base respectively, among them, said fixed contacts into contact with moving contacts arranged on the fuse carrier, said wiring terminals electrically connect the two contacts of the fuse appliance with a main circuit respectively, wherein,

• the fuse appliance further comprises a rotational-linear pulling type operation mechanism;
• the rotational-linear pulling type operation mechanism comprises a semicircular rotary shaft structure and a linear movement type guide rail structure;
• the semicircular rotary shaft structure comprises two semicircular convex shafts as well as a first circular straight groove and a second circular straight groove, the linear movement type guide rail structure comprises two slider protrusions as well as a first guide rail groove and a second guide rail groove, the first guide rail groove and the second guide rail groove are arranged in parallel;
• and the two slider protrusions are in slide fit with the first guide rail groove and the second guide rail groove respectively;
• the two semicircular convex shafts of the semicircular rotary shaft structure are in mounting fit with the first circular straight groove and the second circular straight groove respectively, and the two slider protrusions of the linear movement type guide rail structure are in mounting fit with the first guide rail groove and the second guide rail groove respectively, so that the fuse carrier performs rotational movement or linear movement below in relation to the fuse appliance base, during the closing operation stage of the fuse appliance, the two slider protrusions are separated from the first guide rail groove and the second guide rail groove respectively, thus the fuse carrier can perform rotational movement only in relation to the fuse appliance base and cannot perform linear movement;
• during the opening operation stage of the fuse appliance, the two slider protrusions enter the inlets of the first guide rail groove and the second guide rail groove respectively, thus the fuse carrier can accomplish an interchange between these two movement forms, i.e. rotational movement and linear movement, in relation to the fuse appliance base at a transition position where the fuse carrier is pulled out of or pushed into the fuse appliance;
• during the pull-out or push-in operation stage of the fuse appliance, the fuse carrier is constrained to perform linear movement only in relation to the fuse appliance base;
• and the linear movement of the fuse carrier constrained by the semicircular rotary shaft structure and the linear movement of the fuse carrier constrained by the linear movement type guide rail structure are consistent in movement direction.