Crank arm wheel bearing sealing device and roller arm assembling system

The utility model discloses a crank arm wheel bearing sealing device and a roller arm assembly system, relates to the technical field of pellet production, and solves the technical problems of sealing leakage, bearing damage and frequent equipment replacement of a crank arm wheel bearing device. Comprising a stationary ring seat and a flange moving ring seat, the stationary ring seat is sleeved outside a thicker section of a rotor shaft, the flange moving ring seat is sleeved outside a thinner section of the rotor shaft, the stationary ring seat is provided with a first channel, a second channel, a third channel and a fourth channel which are annularly arranged, a first sealing ring in the first channel is in close contact with the flange moving ring seat, and a second sealing ring in the second channel is in close contact with the flange moving ring seat. The strong magnet in the second channel is in magnetic connection with the flange moving ring seat, the static ring friction pair in the third channel is a