The present disclosure relates to a cross-flow shredder for grinding material with integrated dust-tight conveying means and air recirculation, and a method for grinding material using the cross-flow shredder according to the disclosure. An apparatus and a method for comminuting material to be ground are disclosed, the apparatus comprising a feed opening for material to be ground, a feed device, a cross-flow shredder, two screw conveyors for conveying the material to be ground and an intermediate dust-tight bunker, the two screw conveyors being connected in a dust-tight manner to the cross-flow shredder on the respective feed side and in a rod-tight manner to the intermediate bunker on the discharge side, the intermediate bunker being connected to the cross-flow shredder via a hose or pipe system, and the intermediate bunker having a discharge opening closed by a slide valve.

Provided is an ultrafine pulverization system for rhizome traditional Chinese medicine (TCM), relating to the technical field of TCM processing, and comprising a coarse pulverizer and a fine-ultrafine pulverizer, a feeding elevator is provided on one side of the coarse pulverizer, and a screw feeder is provided between the coarse pulverizer and the fine-ultrafine pulverizer; the coarse pulverizer includes a coarse pulverization base and a coarse pulverization upper housing, the coarse pulverization rotor is provided in a coarse pulverization blade assembly; the coarse pulverization rotor is connected to a first driving mechanism; and the fine-ultrafine pulverizer includes a fine pulverization device, a pneumatic classification device, and an ultrafine pulverization device being provided in turn from top to bottom, an annular air bag is provided outside the ultrafine pulverization device, the fine pulverization device and the ultrafine pulverization device are communicated with each other through a number of blanking channels.