Mechanical symmetrical 3-roller plate bending machine has 3 symmetrically arranged rolls and the upper roll is located at center of two lower rolls. A worm and gear drive and a screw rod and screw auxiliary drive are used to drive rolls to move vertically. The gear on main speed reducer is used to mesh the gears of both lower rolls for rotation so as to provide torque for rolling plate. Metal plate is located among three working rolls (two lower rolls and one upper roll) and subsequently continuously bent under pressure of upper roll and rotation of lower rolls to generate permanent plastic deformation on plate so as to roll the plate to required shape such as cylinder, taper cylinder or arc. The disadvantage of mechanical symmetrical plate bender with 3 rolls is the end of plate can not be bent preliminarily.
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