... to eliminate stress,high in rigidity.Hydraulic drive,swing beam,return of knife beam is smooth and prompt Frame welded ... eliminate stress,high in rigidity.Hydraulic drive,swing beam,return of knife beam is smooth and prompt by ... beam can be adjusted steplessly,conveniently and fast.Preselection of single or continous strokes.Preselection of cutting number and cutting strokes. Hydraulic swing beam shear ...