Locking mechanism for hub

The locking mechanism comprises a wheel shaft, a rotating wheel and a brake mechanism, the rotating wheel is connected with the wheel shaft and located on the outer side of one end of the wheel shaft, the rotating wheel comprises a wheel body, the outer side of one end of the wheel shaft is movably connected with the wheel body, and the brake mechanism is located in an inner cavity of one end of the wheel shaft. By arranging the electromagnetic braking mechanism, when the hub is normally used and no current flows in the first coil due to sudden power failure, the first fixed iron core and the braking piece quickly lose magnetism, so that the rotating wheel is braked under the action of the first elastic piece, and the rotating wheel is locked under the action of power failure of the locking mechanism. The locking piece is pushed rightwards by the second elastic piece, so that the lower end of the braking piece is supported, the braking piece is in a locking state in a power-off state, and the situation that p