Among all types of conveying equipment, roller conveyors have an extremely wide range of applications and a solid position that cannot be ignored. Roller conveyors are widely used in express delivery, postal services, e-commerce, airports, food and beverages, fashion, automobiles, ports, coal, building materials and other various manufacturing industries. The contact bottom of goods suitable for roller conveyance should be flat and hard, such as: rigid cartons, flat-bottomed plastic boxes, metal (steel) boxes, wooden pallets, etc. At the same time, it should be noted that the contact surface between the goods and the roller is too small (point contact or line contact). Even if it can be transported, the roller will be easily damaged (local wear, taper sleeve damage, etc.), which will affect the service life of the equipment. For example, the bottom contact surface is Metal material box with mesh structure.