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The 4-roller plate bending machine is used to roll the metal plate , the roller is driven through hydraulic motor+planetary gear - details see: https://www.machineto.com/wb12k-4-roller-bending-machine-10123416

The machine adopts the four roller structure with the roller is driven through hydraulic motor+planetary gearbox, The lower roller makes vertical movements and imposes a force on the piston through the hydraulic oil in the hydraulic cylinder so as to clamp the plate tight. Side rollers are arranged on the two sides of the lower roller and making inclining movement along the guide rail, and provide drive through the screw, the nut, the worm and the lead screw.
The advantage of the machine is that the preliminary bending and rolling of the top ends of the plates can be conducted on the same machine.

Spec	50× 2500	40× 4000	60× 2500	60× 3200	60× 4000	80× 3200	100× 2500	100× 3200	100× 4000	120× 4000
Max width(mm)	2500	4000	2500	3200	4000	3200	2500	3200	4000	4000
Max thickness(mm)	50	40	60	60	60	80	100	100	100	120
Min-rolling diameter(mm)	2000	2000	2000	2500	2500	2500	3000	3000	4000	5000
Yield limit(MPa)	245	245	245	245	245	245	245	245	245	245
Rolling speed(m/min)	4	4	3.5	3.5	3.5	3.5	3	3	3	3
Pre-bending thickness(mm)	42	32	50	50	50	70	90	90	90	100