Estimate carrying-idler spacing on the stable run, impact-idler spacing under the chute, and a recommended troughing angle from belt width, bulk density and drop height.
Closer spacing under the loading point; widen on long, stable runs.
Use cushion-ring impact idlers or an impact bed directly under the chute.
Standard 35° three-roller set; reduce to 30° for sticky material, raise toward 45° for high-capacity wide belts.
Preliminary spacing guidance only; final idler spacing must be confirmed against belt sag limit, belt tension and full duty statement.