... rollers.Details of the DTII rubber belt conveyor machineryUsed range: Rubber belt conveyor used in coal, mine, ... idler roller: 35° and 45°. Note: We usually use 35° trough idler. Idler rollers: Light, middle, ... steel wire, plastic belt. 2. Driving part (electronic motor, high speed coupling, speed reducer, low speed coupling, ... , shippment. explosion-proof belt conveyor machinery for coal mining use