1. Choice of the length of the drum: For goods of different widths, the drum suitable for the width should be selected. Generally, the "conveyor + 50mm" should be adopted. 2. Selection of wall thickness and shaft diameter of the drum: According to the weight of the conveyor, the drum is evenly distributed to the contacting drum, and the required load of each drum is calculated, so as to determine the wall thickness and shaft diameter of the drum. 3. Drum material and surface treatment: According to the different conveying environment, the material and surface treatment (galvanized carbon steel, stainless steel, blackening or gluing) of the drum are determined. 4. Choose the installation mode of the drum: According to the specific requirements of the overall conveyor, choose the installation mode of the drum: spring pressing type, inner tooth shaft type, flat tenon type, through-shaft pinhole type, etc. For the conical drum of the bender, the width and taper of the roll surface depend on the size of the goods and the turning radius. 
1. Wear good dust mask and gloves. 2. Cleaning drum should be operated by special person. Before driving, check whether the equipment is working properly, whether there is any defect, whether the fastener is loose. 3. Each batch of castings together with core iron shall not exceed 75%-80% of the volume of the drum. Heavy weight should not exceed the stipulation. 4. Before loading, the drum should be fixed with pins so as not to rotate and injure people. 5. After the drum is loaded with castings, the drum cover should be covered and bolted. When cleaning, first start the ventilation and dust removal equipment, then open the drum. 6. To unload the castings, the drum cover should be transferred to the front side and fixed with a bolt before the drum cover can be opened. 7. When the drum is working, it is strictly forbidden for people to approach. Castings or other objects shall not be stacked around. 8. The cylinder cover shall not be opened until the impeller of the cylinder is completely stopped by shot blasting.