The drum faced rollers are widely used in steel, power plants, docks, coal mines and other transportation industries. They are carefully processed with high-frequency welded pipe and seamless steel pipe, which can ensure that the wall thickness of the tube body is uniform, and the outer circle of the tube meets the design requirements, without the need for finishing the outer surface and other processes. The outer diameter jump is less than 0.5mm. The effect of drum faced rollers on belt correction is very significant, especially at high speed conveyor. Characteristics of crowned roilers: 1) The drum faced roller has wear resistance, very low friction coefficient, and is not easy to wear the belt; 2) Superior self-lubricating, no oiling, difficult to use under harsh conditions; Corrosion resistant to antistatic, anti-combustion, aging, acid, alkali and organic solvents; 3) They can withstand repeated shocks and vibrations; ambient temperature range: -30 °…