Steel plate double-pre-stacking system for single shear line, and stacking method thereof

A stacking method using a dual pre-stacking system of steel plates for a single cutting line comprises the following steps:

• 1) providing a dual pre-stacking system comprising:
• a cooling bed inspection stand, a crop shear with a cut-to-length function, a bilateral shear, a first inkjet printer, a front pre-stacker, a cut-to-length shear, a length and thickness gauge, a second inkjet printer, surface check/size inspection and fitting, and a rear stacker arranged in order and/or separated from each other along the roller way;
• 2) inspecting a surface of a rolled steel plate on a cooling bed inspection stand, and meanwhile, locating the steel plate at an outlet of the cooling bed inspection stand before feeding it along the roller way into an inlet of a crop shear, wherein the steel plates include a raw edge steel plate and a width-direction trimmed steel plate;
• 3) when there are less than two steel plates to be cut at a cut-to-length shear, using a crop shear with a cut-to-length function to perform a head and tail end cutting and segmentation on the steel plates according to the normal procedure;
• and when there are no less than two steel plates to be cut at a cut-to-length shear, using the crop shear to perform a cut-to-length cutting on the steel plates;
• 4) passing the raw edge steel plate directly through a bilateral shear, and using the bilateral shear to perform the bilateral cutting on the width-direction trimmed steel plate;
• 5) inspecting a surface quality and shape of the steel plate which is cut to length by the crop shear at the bilateral shear, wherein if there are the problems on plate shape and quality, the steel plate is not to be pre-stacked;
• and, there is no need to inspect the steel plate which is segmented but not cut to length by the crop shear;
• 6) inkjet printing/imprinting the steel plate which is qualified for four-edge cut along the roller way at the outlet of the bilateral shear;
• 7) after completing the inkjet printing/imprinting, using a front pre-stacker to perform pre-stacking operation on the steel plates with qualified surface quality, size and plate shape along the roller way at the outlet of the bilateral shear and the inlet of the cut-to-length shear;
• and
• 8) arranging the steel plates after the pre-stacking operation at rear of the steel plates to be cut at the cut-to-length shear, and passing them directly through the cut-to-length shear, surface check/size inspection and fitting for warehousing after the steel plates ahead are cut.