Automatic switching mechanism of dual-power automatic change-over switch

The invention relates to an automatic switching mechanism of a dual-power automatic change-over switch, which comprises a shell, a motor and a switching assembly, the conversion assembly comprises a motor gear, a square shaft, a push rod, a transmission shaft disc rotationally arranged on the square shaft and matched with the motor gear in a linkage mode, an energy storage spring set arranged between the push rod and the transmission shaft disc, an output shaft disc arranged on the square shaft in a linkage mode and a stop spring piece arranged on the output shaft disc in a linkage mode. Limiting plates used for limiting the stop spring piece in a common power supply position, a double-opening position and a standby power supply position are arranged in the shell, the transmission shaft disc moves along with the motor gear and pokes the stop spring piece to move, and reciprocating switching of the stop spring piece between the double-opening position and the common power supply position and between the double