Self-locking type wind turbine generator impeller lock structure and using method thereof

The self-locking type wind turbine generator impeller lock structure comprises an impeller installed on one side of a back plate, a clamping piece frame installed on the edge of the impeller, a clamping piece installed at the end, away from the impeller, of the clamping piece frame in a sliding mode, a reset mechanism is arranged at one end of the clamping piece, and a locking pin cylinder is fixed to the periphery of the impeller. A locking pin matched with the locking pin barrel in section shape is slidably mounted in the locking pin barrel, and a driving mechanism is arranged at the tail of the locking pin. The using method comprises the steps that the wind turbine generator set is driven to be in a shutdown state, when the rotating speed of the impeller is reduced to be about to stop, the driving motor in the driving mechanism is started so that the locking pin can be pushed out, and the pushed-out locking pin makes contact with the clamping piece and transversely pushes the clamping piece till the lockin