1. Selection of the length of the drum: For goods of different widths, a drum that is suitable for the width should be selected. Generally, "transportation +50mm" is used.

2. Selection of the wall thickness and shaft diameter of the drum: according to the weight of the conveyed material, it is evenly distributed to the contacting drum, and the required load-bearing capacity of each drum is calculated to determine the wall thickness and shaft diameter of the drum.

3. Roller material and surface treatment: According to the different conveying environment, determine the material and surface treatment (carbon steel galvanized, stainless steel, blackened or coated) of the roller.

4. Select the installation method of the roller: According to the specific requirements of the overall conveyor, select the installation method of the roller: spring press-in type, internal tooth shaft type, full flat tenon type, through shaft pin hole type, etc. For the tapered drum of the bending machine, the width and taper of the rolling surface depend on the size of the goods and the turning radius.