AC high voltage SF6 circuit breaker and spring operating mechanism thereof

The invention discloses an AC high-voltage SF6 circuit breaker and a spring operating mechanism thereof. The spring operating mechanism comprises a opening mechanism and a closing mechanism. The switching mechanism comprises a opening crank arm, a opening spring connected with the switching crank arm and providing a opening action force and an output shaft assembly providing a closing action force. The closing mechanism comprises an energy storage spring, an energy storage crank arm connected with the energy storage spring, an energy storage spindle connected with the energy storage crank armand driving the energy storage crank arm to rotate, a unidirectional clutch assembly for driving the energy storage spindle to rotate unidirectionally, and a cam fixed on the energy storage spindle and for generating closing force by the unidirectional clutch assembly. In the opening process, the speed of the opening spring can be adjusted only by the opening spring, that is, the speed of the opening spring can be adjuste