Abstract: The invention relates to a roller mill with two rollers driven in opposite directions, in which the two gear driven cases are connected directly to one another by a torque support containing a flexible member.

Abstract: The invention relates to an air-controlled settling apparatus having an air vessel within which is a wall that divides the vessel into air supply and air exhaust ducts. Inlet and outlet valves are mounted within the air supply duct and establishes communication between the settling chambers and the air supply and exhaust ducts. The apparatus construction is distinguished by simple construction and low noise in operation.

Abstract: The invention relates to a percussion jig in which the carrier for material to be separated is freely suspended in the region of its centroidal axis on the piston rod of a hydraulic drive cylinder. This results in a particularly simple construction subject to little wear.

Abstract: The invention relates to apparatus for introducing fine material into a combustion zone by means of an air duct which has a constriction in the region of its junction with the material duct in such a way that the rate of flow is considerably increased at the point where the material is introduced and this favors the loosening of the material stream and the delivery of the material to the combustion zone.

Abstract: A roller mill assembly includes a separator disposed above a roller mill housing, and an exhaust air duct above the separator. The sieve is movable horizontally from between the mill housing and the exhaust air duct on a crane track.

Abstract: A roller crushing mill has a housing within which is a plurality of angularly spaced crushing rollers that bear on a grinding plate rotatable about a vertical axis. Above each roller is a sifter for the reception of crushed material. Nozzles positioned in the vicinity of the rollers establish upwardly directed airstreams at the periphery of the grinding plate to entrain crushed material thrown off the grinding plate and deliver such crushed material to the sifters. Other nozzles positioned between adjacent ones of the rollers at the periphery of the grinding plate direct airstreams inwardly of the plate toward the crushing track to feed material to the crushing track.