Uncoiling unit with the discharge pipe, constant tension winding, automatic blade clearance and heavy quantity adjustment precision fixed width shear trimming device, 6 heavy type precise straightening machine, according to the different thickness plate with automatic can realize precise straightening roll change, straightening plates after flying shear machine, slitting and various forms of crank flying shear, shearing precision is high, in the form of vacuum belt of stacking machine for sheet piling.