... 45°. Note: We usually use 35° trough idler. Idler rollers: Light, middle, heavy types. Diameter 500~1000mm. Diameters of the bearing ... device, Belt stopping device)9. Accessories (covering, inverted trough, a funnel and so on)Special devices: High temperature, cold weather ... 1 set at leastDelivery time: Within 30 days, FOB, shippment. explosion-proof belt conveyor machinery for coal mining use