Especially the loading and unloading is more so. Brittle materials also limit the speed of the strip. When the conveying belt and the conveying material pass through the roller, the powdery material should be delivered with a sufficiently low belt speed. Low speed can make the brittle material in loading and unloading can not jump fragmentation. The sharp edges of the material should be delivered with a medium speed. Because edge will be excessive wear on the conveyor belt surface, especially when the loading velocity in the conveying direction was significantly lower than that of the conveyor belt speed. Increasing the belt speed can reduce the bandwidth and the belt tension. But to bring these benefits at the same time, also need to weigh the possible delivery of wear, beat material, airflow resistance, bearing support and large impact intensifies and delivery with all parts of life is to reduce the disadvantages.