The work aims to reduce the bend wear in the transportation of grain particles. Swirling conveying was introduced and a lateral air supplement rotation device was designed. The angle between the central axis of the lateral rotation device and the central axis of the main pipeline was 45°, 55°, and 65°, respectively. The multiphase flow velocity of the main pipeline was fixed at 20 m/s, and the airflow velocity of the lateral rotation device was 20, 30 and 40 m/s. CFD-DEM was used to simulate the transportation of grain particles in a bend, and indicators such as pressure drop, particle distribution, and spiral traces were compared. When the angle between the side rotation device and the main pipeline was 55°, and the airflow speed of the lateral rotation device was 30 m/s, the particles showed spiral forward, significantly reducing the wear on the pipe wall, and the transportation effect is the best. After experimental verification, it was consistent with the simulation results. The device designed in this paper can obviously reduce the wear on the bend during grain conveying, and has good transportation effect.