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   structure and main parts  This equipment composed of main machine part, hydraulic system , electricity control system.3-1 main machine part composed of top rolls , down rolls and level motion device support rolls device , tuning device , balance device, lubricate device , left and right work frame and bottom plate.1) upper rolls device composed of main cylinder, upper bearing pedestal, upper rolls, double self-aligning bearing .two cylinders provide the pressure for upper roll bending , main cylinder working pressure is 20 Mpa ,max pressure of upper roll multiply 0.8 times to compensate for pre-bending. Upper roll two ends fit with double self-aligning bearing to reduce the friction and motor power. The material of upper roll is 42CrMo , heat treatment is HB220-280.2) down roll and level motion device.The material of down roll is 42CrMo, heat treatment is HB220-280. it composed of down of roll, down roll bearing pedestal, down roll input gear, down roll, glide be