Special supply:heat-resistant,explosion-resistant. It caontains: light-duty,middle-sized and ... conveyor machineryUsed range: Rubber belt conveyor used in coal, mine, metallurgy,power plant, harbon, cement ... usually use 35° trough idler. Idler rollers: Light, middle, heavy types. Diameter 500~1000mm. Diameters ... Within 30 days, FOB, shippment. explosion-proof belt conveyor machinery for coal mining use