The machine has a structure of 3-roller symmetrical type. Upper roller can go up and down in the symmetric position over the center of both lower rollers. Hydraulic plate rolling machine can obtain this motion through hydraulic oil acting on piston inside hydraulic cylinder with digital indicator and accurately display the height of both ends of upper rollers. Mechanical upper roller lifting motion can be obtained by screw rod, screw and worm-drive. Two lower rollers produce a rotating motion which will provide power for plate running through the mesh between output gear of reducer and the gear of lower roller. At present, it is widely used in different industries. http://www.bending-machine-china.com/pid11406651/hydraulic+digital+display+top-pressing+plate+rolling+machine.htm