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The carbon steel roller conveyor features a structure in which the shaft is fixed to the outer supports of the carbon steel rollers; during operation, only the roller body and bearings rotate, resulting in a transmission system in which the main load-bearing elements are separated from the transmission components. The design concept is to reduce the overall operating resistance. In the design of the shaft, the oil injection hole is located at the shaft end; lubricating oil is injected through channels inside the shaft body. A seamless steel tube sleeve is placed on the outside of the shaft, and its ends are welded to the cast welding plates via connection plates, thereby creating a sealed system in which the bearing, the shaft, and the sealing elements form a single unit. Design features of carbon steel roller conveyors: 1. The structure of carbon steel roller conveyors effectively addresses issues such as misalignment between the shaft end and bearings during the assembly of large carbon steel rollers, which can cause shaft steps to form and lead to abrasion of the bearing inner rings, thereby affecting the service life of the components and resulting in wasted labor time. Using bushings for assembly allows for better alignment and facilitates installation. 2. The radial clearance between the shaft sleeve of the carbon steel roller conveyor and the shaft is 0.5–1 mm; oil is injected from the oil cup at the shaft end, allowing the lubricant to fill the gap between the shaft sleeve and the shaft. An oil film is formed between them, which helps to replenish the lubricant in the bearings and sealing chambers. Tests have shown that the overall rotational resistance of the new type of carbon steel roller is about 40% lower than that of conventional carbon steel rollers. 3. The shaft sleeves of carbon steel roller conveyors have been treated to resist corrosion; this prevents impurities such as oxides that form on the inner wall of the drum due to aging and external erosion from entering the transmission system, **thus extending the lifespan of transmission components such as shafts and bearings and improving the sealing performance of the carbon steel rollers. 4. The coupling plates of the carbon steel roller conveyor adopt a cast-welded structure, with the coupling plates and the conveyor drum skin being welded together using \"U-shaped welds.\" To ensure the adhesion strength of the cast gel, the turning process for the metal surface of the cylinder was reasonably designed through testing to meet the technical requirements.