A device for grinding or waste materials, various, in particular waste materials, industrial and domestic menageres bulky

摘要

Apparatus for comminuting industrial and/or bulky domestic waste materials has an upright housing with a funnel-shaped section located above a stationary counterknife which cooperates with a single rotary knife therebelow or with two rotary knifes respectively disposed thereabove and therebelow. The inner side of the funnel-shaped housing section has a downwardly sloping spiral surface which advances waste material downwardly toward the upper rotary knife or toward the counterknife and whose upper portion flares outwardly and downwardly at a gradually diminishing angle with respect to the common axis of the knives. The lower portion of the spiral surface merges gradually into the upper portion and thereupon flares outwardly and upwardly with respect to the common axis. A feeding device which rotates with the rotary knife or knives extends into the funnel-shaped section and has one or more arms whose edge portions resemble spirals or helices having a lead opposite to that of the spiral surface. The arm or arms of the feeding device cooperate with a ripping projection in the funnel-shaped section to break, deform or rip larger items of waste material, and with the spiral surface to advance the material into the range of the cutting edges on the counterknife and the upper rotary knife or the cutting edges of the counterknife and the lower rotary knife. The latter is surrounded by an outlet having a tangential duct for evacuation of comminuted material.