Device for increasing face width of forepolings during working face for recovering main roadway coal pillars passing through empty roadway

The invention aims to provide a device for increasing the face width of a forepoling during working face for recovering a main roadway coal pillar passing through an empty roadway. Front beams are connected with top beams, and caving shields are connected with the top beams in a hinged mode; the upper end heads of connecting rods are connected with the caving shields in a welding mode, and the lower end heads of the connecting rods are connected with support bases in a hinged mode; the upper end heads of stand columns are connected with the top beams, and the lower end heads of the stand columns are connected with the support bases; and pier columns are connected with the support bases through oil cylinders, and pier column gangue blocking plates are welded to column bodies of the pier columns. Finally, through linkage cooperation of the pier columns and other components, the supporting position is reasonably adjusted, the face width is increased, and on the basis that the normal supporting effect of the fore