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Hydraulic three roller symmetrical bending machine main features: this machine on roll vertically, vertical lifting hydraulic drive, gained through hydraulic cylinder piston rod in hydraulic oil; lower roller for Rotary driven through gear reducer output, for the coil to provide torque and lower roller lower roller and adjustable. Roll on the drum shape, improve the linearity, suitable for super-long cross section on the tank for the specifications of a variety of adjustable symmetric three rolls plate bending machine, metal sheet can be rolled into a circular shape, curved and conical workpiece within a certain range, two lower roller to active roll of the last roller for driven roller. It is widely used in shipbuilding, boilers, aviation, electricity, chemical, metal structures and machinery manufacturing industries.