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This application discloses an automatic fixing and locking device and its working method for transporting target projectiles. The automatic fixing and locking device includes: a rotary motor, a locking and fixing mechanism, and a power transmission device. The rotary motor is mounted on the erecting support of the launching device. The locking and fixing mechanism is mounted on the erecting support of the launching device and is rotatably connected to the erecting support. The locking and fixing mechanism includes at least: a cylinder mounting plate, a fixing plate, a cylinder, a cylinder connecting plate, a first opening and closing action plate, a first contact limiting plate, a second opening and closing action plate, a second contact limiting plate, a first transmission connecting plate, a second transmission connecting plate, and a power transmission wheel. The power transmission wheel is disposed on the fixing plate and is connected to the rotary motor through the power transmission device. This application has a high degree of automation, requiring no manual intervention; automatic locking and unlocking of the target projectile placed on the launching device can be achieved through remote control.

The circuit breaker comprises an operating mechanism and a contact unit, the contact unit comprises a moving contact assembly and a static contact, the operating mechanism comprises a linkage lever, a support, a rocker assembly, a trip, a lock and a reclose pivotally arranged on the support respectively, a main spring arranged between the rocker assembly and the linkage lever, a first crank pivotally arranged on the trip and in position cooperation with the trip and the linkage lever, and the linkage lever is connected with the contact through a transmission assembly; the circuit breaker further comprises a quick operation structure, the quick operation structure comprises a first push rod, a second push rod and a third push rod, the first push rod is pivotally arranged and is in driving cooperation with the moving contact and the second push rod respectively, the second push rod is pivotally arranged and is fixedly connected with the third push rod, and the reclose is provided with a reclose driven arm in driving cooperation with a driving part of the third push rod; the circuit breaker of the present application has the advantages that the transmission level of the quick operation structure is reduced, the reclose of the operating mechanism is driven by the quick operation structure, the moving contact is driven through the quick transmission of various components, and the quick operation of the reclose is realized.