... about 10 years' experince in belt conveyors, conveyor idler rollers, conveyor rollers, roller frame design and production. All of ... DTII rubber belt conveyors:Used range: Rubber belt conveyor used in coal, mine, metallurgy,power plant, ... Driving rollers and returning rollers)4. Idler rollers parts (Trough idler rollers, parallel idler rollers, adjusting core idler rollers, and impact idler rollers , ...