... spare partsTrough idler roller: 35° and 45°. Note: We usually use 35° trough idler. Idler rollers: Light, middle, heavy types. Diameter ... trough, a funnel and so on)Special devices: High temperature, cold weather, exploration-resistant, fire-resistant, acid-resistant, alkali-resistant ,waterproof ... : Within 30 days, FOB, shippment. explosion-proof belt conveyor machinery for coal mining use