... 45°. Note: We usually use 35° trough idler. Idler rollers: Light, middle, heavy types. Diameter 500~1000mm. Diameters of the bearing ... spare parts 1. Belt(4 kinds): Canvus, nylon, steel wire, plastic belt. 2. Driving part (electronic motor, high speed coupling, speed ... : 1 set at leastDelivery time: Within 30 days, FOB, shippment. explosion-proof belt conveyor machinery for coal mining use