We adopt double roller transmission device, and the chain end type adopts chain type cold bed structure to ensure the minimum deformation of normalized, quenched and tempered steel pipes ; (double idler transmission can ensure the speed of steel pipe rotation and ensure the advancement speed, chain-type cooling bed structure allows the steel pipe in the cooling process while rotating forward so that the deformation amount is reduced to a minimum ( chain cooling bed upwardly inclined by 5 ⁰ ) , since the steel has been moving the cooling bed, the hot can The effect of steel pipes on structural components is minimized). The double roller transmission adopts a reducer and a frequency conversion speed regulating device to ensure the speed requirements of steel pipes of different diameters . Double roller table , a total of 31 sets, in order to take care of other installations, all roller spacing must be designed according to 1200 , otherwise they will fight each other, the center distance of the two wheels is φ 415 mm , the diameter of the roller is φ 400 , taking into account φ 133 to [Phi] 325 heating the blank, wherein a roller driven wheel, the other rollAs a supporting non-power wheel, the wheel is designed with a certain set of mounting positions, and the power wheel is designed with a set of 1 : 1 gearboxes for the purpose of moving the center distance of the transmission connection outward by 300 mm . The transmission connection between all the power rollers and the power roller is a cross-shaft universal coupling. In order to ensure the uniform and balanced transmission speed of the workpiece, a variable frequency motor is used for the power. Motor speed control with frequency converter. And placed into the center of the track . 5 [deg.], And the angle can also be fine-tuned according to [Phi] 325 computing the blank, the motor speed approximately every minute . 7 .5 around circle, a bad forward feed rate of about 524 mm or so.