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Design an automatic feeding device of 1500x1000mm, using a stainless steel herringbone mesh belt for transmission. How should the internal structure of the drum be designed? Is it necessary to apply plastic coating? Whether the drum needs to be plastic-coated depends on the user’s requirements. If the product has a steel casing, its surface can be coated with one of several common materials such as carbon steel paint, zinc plating, chromium plating, nickel plating, or stainless steel. In the case of plastic coating, there are types that are resistant to acids, alkalis, or other chemicals; the most common is coating with black rubber. There are also differences in the thickness of the coating layer and the types of patterns. In short, it is done according to the requirements provided by the customer; of course, some brands do not offer products with a surface coating. Common purposes of surface coating: 1--To prevent the products being transported from colliding with the rollers and getting damaged ； 2--Silent ； 3--Prevent metal corrosion. Therefore, such a requirement eliminates the need for plastic coating. If an external power drum is used, welding can be employed; however, there is a risk of eccentricity if the welding is not done properly. It is recommended to machine the inner diameter of the outer tube and the outer diameter of the inner shaft before welding, so that there is a clearance fit between them. Additionally, if the drum rotates at a very high speed, it’s advisable to perform dynamic balancing; otherwise, the bearings at both ends and even the gearbox may be damaged due to vibrations.