T  Our company provide ranges of rollers to the customers that conform to TD75、DTⅡ type of belt machine. The sizes of every parts of the cylinder, breadth of plate, wheel hub and axis are both reasonable calculated by computer. There’re light, medium and heavy structures according to different load bearing. The cylinder with big torque moment can use cast-welding structure. CO2 gas is adopted in welding of the roller to ensure welding reach the concealed arc welding. Welding seams have been tested with ultrasonic wave or X ray.  The surface of transmission roller has been vulcanizing treated into herringbone or diamond pattern. Different key-slots are adopted in the joint between roller and axial according to different demand. To the heat expansion and swelling sleeve joint, static balance test has been made to the roller in order to reach minimum rotary resistance before leaving the factory. The bearing base is portion-structure, which makes the maintenance simple and easy.