Adjustable conveying device for flat-bottom boxes

The invention relates to the technical field of box conveying, and discloses an adjustable conveying device for flat-bottom boxes. The adjustable conveying device comprises a conveying belt support frame and a main conveying belt arranged on the conveying belt support frame, wherein the main conveying belt is formed by connecting a plurality of main conveying belt frameworks; main rotating rollers are arranged in the main conveying belt frameworks; the axial directions of the main rotating rollers are the same as the moving direction of the main conveying belt; a plurality of auxiliary conveying belts which are parallel to each other and are controlled independently are arranged below the main conveying belt; the moving directions of the auxiliary conveying belts are vertical to the moving direction of the main conveying belt; the auxiliary conveying belts are formed by connecting a plurality of auxiliary conveying belt frameworks; a plurality of auxiliary rotating rollers are arranged in the auxiliary conveying belt frameworks; the axial directions of the auxiliary rotating rollers are vertical to the axes of the main rotating rollers; the lower sides of the main rotating rollers are in contact with the upper sides of the auxiliary rotating rollers; each auxiliary conveying belt correspondingly supports one or more rows of main rotating rollers. The adjustable conveying device has the beneficial effects of simple structure, high conveying efficiency, and capability of sorting, combining, rotating, aligning and correcting boxes without causing any damage.