The groove type aligning idler is mainly based on the TD75 selection manual. Its 3 troughing rollers and 2 small vertical rollers are installed on the upper crossbeam, the lower crossbeam is connected to the intermediate frame, and the upper and lower crossbeams are connected together through a rotating shaft. When the conveyor belt deviates to one side, the edge of the conveyor belt touches the vertical roller. Under the action of lateral force, it drives the upper crossbeam to rotate around the rotating shaft by an angle, causing the idler on the deviated side to tilt forward. At this time, the self-aligning idler applies a lateral thrust to the conveyor belt, prompting the deviated conveyor belt to automatically return to its original position, realizing automatic correction of the deviated belt and ensuring the conveyor belt runs in alignment.