Secondary transmission structure of industrial atmosphere protection roller kiln

The utility model discloses a secondary transmission structure of an industrial atmosphere protection roller kiln, which comprises a conveying roller way, a primary transmission device and a secondary transmission device, a transmission mechanism is arranged on the conveying roller way, the primary transmission device comprises a motor, and the motor drives the transmission mechanism to move through a transmission shaft. The second-stage transmission device comprises a hand-cranking speed reducer, a first half clutch, a second half clutch and a clutch driving part, the first half clutch is arranged at the rotating output end of the hand-cranking speed reducer, the second half clutch is in transmission connection with the transmission shaft, and the clutch driving part drives the second half clutch to move in the axial direction of the transmission shaft; in the working state of the hand-cranking speed reducer, the second half clutch is meshed with the first half clutch, the hand-cranking speed reducer drives