In the current production-oriented enterprises, the roller conveyer can not only fulfil the process needs of many aspects, but also realize the stacking and conveying of materials by the stacking roller. The roller conveyer has the characteristics of simple, high reliability and easy to use and maintain. Roller conveyor is suitable for the transportation of all kinds of boxes, bags, pallets and other goods, as well as use the turnover box on the pallet to transport bulk material, small items or irregular items, or transport single heavy materials.