The invention relates to a method for preparing and activating a raw material, wherein the raw material is comminuted by means of grinding rollers in a mill-classifier combination, and wherein the mill-classifier combination is set and operated to produce a ground product with a fineness of between D50=3 m and D50=12 m. Here, a part of the grinding product is comminuted by means of the mill-classifier combination to a diameter of <5 m. Subsequently the ground product is subjected to a further classification in an ultrafine grain classifier unit which has a separation threshold in order to separate ultrafine grain with a fineness of <D50=6 m. The invention further relates to an installation configuration for carrying out the method according to the invention.

A vertical roller mill has grinding rollers which roll over a grinding path of a rotatable grinding table, and a surrounding nozzle ring separation area for conveying and separating gas. A coarse fraction of ground material is entrained in gas upwards in ducts from a location that is below, at, or above the nozzle ring separation area and is transported into an entry to a material separator located above the grinding table.

A vertical roller mill has grinding rollers which roll over a grinding path of a rotatable grinding table, and a surrounding nozzle ring separation area for conveying and separating gas. A coarse fraction of ground material is entrained in gas upwards in ducts from a location that is below, at, or above the nozzle ring separation area and is transported into an entry to a material separator located above the grinding table.

A classifier for separating particles is provided. The classifier includes a rotor having a direction of rotation defined by a rotational axis of the rotor, and a plurality of blades disposed on the rotor around the rotational axis. At least one blade of the plurality has a swept orientation in the direction of rotation. The at least one blade is arranged to contact and direct the particles away from the classifier and thereby restrict the particles from concentrating in areas adjacent to the classifier.

A method for grinding a grinding material in a mill including a grinding body and at least one roller which rolls on the grinding body under a grinding pressure, wherein the grinding material is fed in a stream of grinding material, forms a grinding bed between the grinding body and the roller and is crushed in the grinding bed by the roller, wherein a grinding bed height of the grinding bed between the grinding body and the roller is continuously measured, and wherein the mill is controlled based on control variables to achieve a predetermined nominal condition, wherein the control variables include at least the grinding pressure and the stream of the grinding material and the nominal condition includes at least one nominal value for the grinding bed height, wherein a mechanical condition of the roller and therefrom a stability of the grinding bed are continuously determined.

An electrical appliance includes a rotating food processing screw for processing food items exiting the outlet of a chute. The screw is coupled to an electric drive motor for driving the screw in rotation about itself around its central axis. An upper part of the screw has a sweeper for sweeping the outlet of the chute, and a lower part drives down towards the bottom and presses the food fragments coming from the upper part of the screw. Food blocking elements can block the food items. An inscribed sphere, which is geometrically defined by the chute, is movable within the interior of an upper part of a chamber receiving the screw. Two zones of contact between the inscribed sphere and the blocking elements are formed, and a third zone of contact is between the inscribed sphere and the sweeper.

A crushing machine construction kit for the construction of a crushing machine contains a drive device and a frame of a crushing device. The crushing machine construction kit further contains at least two shear shafts and at least two shredder shafts for the selective configuration of the crushing machine as a rotary shear or as a rotary shredder. A method converts the rotary shredder into the rotary shear.

The present invention relates to a bearing element suitable for supporting a grinding disk in a roller mill, comprising a plate-like or disk-shaped base element, an annular disk and a spacer element, wherein the annular disk is disposed substantially parallel to the base element and at a distance from the base element, and is connected at its bottom using an annular spacer element with the base element, and the annular disk has means on its upper side for receiving the axial bearing segments, whereby the spacer element is designed as an annular strip extending in the axial direction and has a plurality of spaced-apart arches in the circumferential direction, whose openings point towards the base element.

The present invention relates to a bearing element suitable for supporting a grinding disk in a roller mill, comprising a plate-like or disk-shaped base element, an annular disk and a spacer element, wherein the annular disk is disposed substantially parallel to the base element and at a distance from the base element, and is connected at its bottom using an annular spacer element with the base element, and the annular disk has means on its upper side for receiving the axial bearing segments, whereby the spacer element is designed as an annular strip extending in the axial direction and has a plurality of spaced-apart arches in the circumferential direction, whose openings point towards the base element.

A vertical roll mill may include a grinding plate, a grinding roll, a nozzle ring that horizontally surrounds the grinding plate, an air feed apparatus disposed under the nozzle ring, a discharge element disposed below or in a region of the air feed apparatus, and a bypass apparatus disposed in the nozzle ring. The bypass apparatus may form a connection between the nozzle ring and the discharge element. Further, the bypass apparatus can discharge particles that are difficult to grind, for example, ductile particles such as iron particles, from the grinding process. In some examples, the bypass apparatus includes a gas-impermeable outer skin in the region of the air feed apparatus.