Paperboard conveying device for printing machine

The paperboard conveying device for the printing machine comprises a conveying belt device, the conveying belt device comprises a conveying belt and supporting frames arranged on the two sides of the conveying belt, the supporting frames are provided with installation vertical plates in the length direction, and the installation vertical plates are provided with a plurality of first installation holes and second installation holes. A linear bearing is arranged in the first mounting hole; a guide plate is arranged on the inner side of the mounting vertical plate, a plurality of sliding rods are arranged on the outer side of the guide plate, and the sliding rods are slidably connected with the linear bearings; a plurality of mounting rods corresponding to the second mounting holes are arranged on the outer side of the guide plate, the mounting rods are parallel to the sliding rods, threads are arranged on the surfaces of the mounting rods, the mounting rods penetrate through the second mounting holes, two locki