Mechanical interlocking device and inflatable cabinet

The utility model relates to a mechanical interlocking device and a gas insulated switchgear, the mechanical interlocking device is arranged between a circuit breaker and a three-station isolating switch, has a first state and a second state, and comprises a shielding member which is movably arranged along a first direction of a connecting line of a grounding hole and an isolating hole on the three-station isolating switch; the linkage assembly is in linkage connection with the shielding piece; in the first state, the shielding piece moves along the first direction to shield the isolation hole and the grounding hole, and the linkage assembly allows a closing switch on the circuit breaker to be switched on, so that the circuit breaker can be switched on, and the isolation or grounding function on the three-station isolation switch is avoided. And in the second state, the shielding piece moves along the first direction to open any one of the isolation hole or the grounding hole, and the linkage assembly is driv