Abstract: A feed system for feeding grinding bodies to a vertical mill includes a pumping unit for sucking a propulsion liquid from a source and for supplying the liquid under pressure into a discharge tube. The system includes an intake connection having an inlet for grinding bodies, an inlet for propulsion liquid, connected to the discharge tube, and an outlet for grinding bodies and propulsion liquid. A principal tube is connected to the outlet of the intake connection for receiving the propulsion liquid and grinding bodies from the tubular intake connection. A static screen is arranged in the feed of the vertical mill for separating grinding bodies from propulsion liquid, the static screen having an inlet for propulsion liquid and grinding bodies, connected to the principal tube, an outlet for grinding bodies to be fed to the vertical mill, and an outlet for propulsion liquid separated from the grinding bodies.

Abstract: The vibrating screen have a screen deck, two sidewalls and a mechanical vibrator comprising two shafts, rotating at the same rotation and in opposite directions, each one of the end portions of each shaft carrying an eccentric weight and being supported on bearings which are supported in the sidewalls of the vibrating screen. The shafts have their end portions, adjacent to each other, supported on bearings mounted to a same bearing case fixed to beams, transversal and having opposite ends fixed to the sidewalls of the vibrating screen. Each end portion of a shaft carries an eccentric weight with a total mass different from that one of the eccentric weights of the end portions of the other shaft, said shafts rotating in determined phases, defining the inclination of the major axis of an elliptical movement imparted to the screen deck.

Abstract: A feed system for feeding grinding bodies to a vertical mill includes a pumping unit for sucking a propulsion liquid from a source and for supplying the liquid under pressure into a discharge tube. The system includes an intake connection having an inlet for grinding bodies, an inlet for propulsion liquid, connected to the discharge tube, and an outlet for grinding bodies and propulsion liquid. A principal tube is connected to the outlet of the intake connection for receiving the propulsion liquid and grinding bodies from the tubular intake connection. A static screen is arranged in the feed of the vertical mill for separating grinding bodies from propulsion liquid, the static screen having an inlet for propulsion liquid and grinding bodies, connected to the principal tube, an outlet for grinding bodies to be fed to the vertical mill, and an outlet for propulsion liquid separated from the grinding bodies.

Abstract: The assembly of the disclosure includes two inclined side rollers and two central rollers, each one of the rollers being mounted around a respective shaft. The shaft of each side roller has an upper end hinged to a respective support portion arranged on one side of the conveyor belt, the shaft of each central roller having ends mounted on opposite sides of a rocker frame. Each one of the opposite sides of the frame has a median portion hinged, in an suspended way, at the lower end of the shaft of a respective side roller.

Abstract: The vibrating screen have a screen deck, two sidewalls and a mechanical vibrator comprising two shafts, rotating at the same rotation and in opposite directions, each one of the end portions of each shaft carrying an eccentric weight and being supported on bearings which are supported in the sidewalls of the vibrating screen. The shafts have their end portions, adjacent to each other, supported on bearings mounted to a same bearing case fixed to beams, transversal and having opposite ends fixed to the sidewalls of the vibrating screen. Each end portion of a shaft carries an eccentric weight with a total mass different from that one of the eccentric weights of the end portions of the other shaft, said shafts rotating in determined phases, defining the inclination of the major axis of an elliptical movement imparted to the screen deck.

Abstract: A roller for a roller grinder, the roller including a shaft and a grinding shell in the form of a tubular sleeve and having an inner face to be retained around the shaft. The roller grinder is characterized in that the shaft includes two shaft parts, each shaft part having a respective inner end portion, wherein the inner end portions are arranged to be positioned facing each other and include coupling portions arranged to couple the inner end portions of the respective shaft parts to each other, thereby forming the shaft. The disclosure further relates to a method for assembling a roller for a roller grinder, the roller including a shaft and a grinding shell in the form of a tubular sleeve and having an inner face to be retained around the shaft.

Abstract: The present disclosure relates to a roll for a roller grinder. The roll includes a shaft having a support structure; a plurality of grinding shell segments circumferentially arranged around the shaft to form a tubular grinding shell supported by the support structure; and a wedging device for each grinding shell segment. Each wedging device is arranged in a channel extending axially along the shall and defined by the associated grinding shell segment and the support structure. Each wedging device is arranged to releasably secure the grinding shell segment to the support structure. The present disclosure also relates to a high pressure grinder including the above roll.

Abstract: The anti-spin system is applied to a cone crusher having a structure (10) carrying an upper housing (20) and a vertical axle (30); an eccentric element (40) to be rotated around the vertical axle (30); and a cone head (60) disposed inside the upper housing (20) and being axially and rotatively supported on the structure (10) and radially supported around the eccentric element (40). The anti-spin system comprises a braking bush (70) carried by the cone head (60) or by the structure (10), and an annular shoe (80) carried by the other of said parts, which are pressed against each other, by action of the inertial centrifugal force acting on the cone head (60), upon “no-load” operation of the crusher, to generate a friction force opposite and superior to that generated between the cone head (60) and the eccentric element (40) and to prevent the latter from rotatively dragging the cone head (60).

Abstract: The invention relates to a roller for a roller grinder, said roller comprising a shaft and a grinding shell in the form of a generally tubular sleeve and having an inner face to be retained around the shaft. The roller grinder is characterized in that the shaft comprises two shaft parts, each shaft part having a respective inner end portion, wherein said inner end portions are arranged to be positioned facing each other and comprise coupling portions (40) arranged to couple the inner end portions of the respective shaft parts to each other, thereby forming the shaft. The invention further relates to a method for assembling a roller for a roller grinder, said roller comprising a shaft and a grinding shell in the form of a generally tubular sleeve and having an inner face to be retained around the shaft.

Abstract: A test device for a roller crusher of the type which comprises a pair of crushing rolls rotating in opposite directions for crushing or pulverizing materials comprises a first sector shaped roll part having a first crushing surface and which is rotatably mounted so that the first crushing surface forms one side of a gap through which materials is fed, a second sector shaped roll part having a second crushing surface and which is rotatably mounted so that the second crushing surface forms the other side of the gap, and a sensor arrangement arranged to sense at least one property of the interaction between the materials fed through the gap and the test device.

Abstract: A bearing arrangement for a roller crusher having a pair of crushing rollers (R), each one including a shaft having end portions, mounted in respective bearing housings carried on a base structure (S) of the crusher, and a median hub portion. The bearing housings of each roller (R) are affixed to a structural frame disposed externally to each roller (R), along one side of the respective roller (R), the structural frame maintaining the bearing housings of each roller (R) rigidly connected to each other. Each bearing housing includes: a base portion affixed to the structural frame and a cover portion turned to the other roller (R) and removably affixed to the base portion.