... years' experince in belt conveyors, conveyor idler rollers, conveyor rollers, roller conveyors, idler roller conveyors, conveyor belting,steel troughing rollers, steel ... troughing idler rollers, rubber rollers, roller frame, belt conveyor machinery and spare parts, roller support etc design and production ... for free change and repair. Expolsion-proof belt conveyor machinery for coal and mining use