The machine has a structure of 4-roller type. Upper roller is main drive which can provide torque for rolling plate materials through the messing between output gear of reducer and upper gear. The lower roller have a vertical lifting motion which can be obtained through hydraulic oil acting on piston inside hydraulic cylinder in order to clamp plate materials called hydraulic drive. Two sides in the lower roller are equipped with side rollers that they can have a incline motion along frame guide direction through screw rod, nut and turbine worm driving. The advantages of this machine are that plate pre-bending and rounding can be done in the same equipment. ModelPlateThickness(mm)Plate Width(mm)Min. Diameter(mm)Upper RollerDiameter(mm)Lower Roller Diameter (mm)Main MotorPower (kW)Weight(kg)W12-6×2500625004002602501112000W12-12×20001225005002602601114000W12-12×25001225008003303101516000W12-16×20001620008003002601513500W12-16×25001625008003603202219500W12-16×30001630008503803403026500W12-20×20002020008003603202217500W12-20×25002025008003803403021500W12-20×30002030009004504204526500W12-25×20002520008003803403022500W12-25×25002525008004003603728000W12-25×300025300010004804604534000W12-30×200030200010004003603725500W12-30×250030250010004804604531000W12-30×300030300012005404805539000W12-35×200035200012004804604529000W12-35×250035250012005404804537500W12-35×300035300014005805205543500W12-40×200040200012005404804536000W12-40×250040250014005605205539500W12-40×300040300015006505805551000W12-50×200050200015006505805543000http://www.bending-machine-china.com/pid11406657/4-Roller+Plate+Rolling+Machine.htm