Abstract: Improvements in EL type pulverizers provide for longer wear life and reduced incidences of parts failures include: deep-dish contour grinding rings, tight tolerance ball tracks, heavy-duty top grinding ring flukes, larger diameter grinding balls, and an improved all-metal, integral snubber design for limiting the horizontal movement of the top grinding ring in order to increase the useful life of the pulverizer elements.

Abstract: An hydraulic loading assembly for ball and ring coal pulverizers has a plurality of compression assemblies connected to a common hydraulic controller for exerting equal pressure simultaneously on each of the compression assemblies. The compression assemblies each have a hydraulic cylinder and piston located above and connected to a non-threaded rod which is in turn located above and connected to a compression spring exerting force on the top grinding ring of the pulverizer.

Abstract: A roller mill includes a base, a pulverizing table having a substantially horizontal upper surface, supported against the base and arranged to rotate around a vertical axis intersecting the upper surface in a center point thereof, an annular groove, formed on the upper surface of the pulverizing table, adjacent to an outer periphery of the table, at least one roller shaft mounted pivotally on the base in proximity to the table, at an angle &agr; with respect to a horizontal direction, toward the center point and having an end portion located above the table, a pulverizing roller supported rotatably against the end portion of the at least one roller shaft and a device for pressing the pulverizing roller toward the annular groove. An outer peripheral surface of the pulverizing roller has a smooth, generally arcuate cross section with at least one substantially flat section in the central portion thereof.

Abstract: A bowl mill transmission which has a high overall transmission ratio with a large output torque, is of compact construction and is simple to assemble. The transmission being a vertically arranged bevel-gear stage for power input and a multi-stage transmission arrangement for power output into a thrust plate of the bowl mill crusher.

Abstract: A bowl mill transmission which has a high overall transmission ratio with a large output torque, is of compact construction and is simple to assemble. The transmission includes a vertically arranged bevel-gear stage for the power input and a multi-stage power-splitting epicyclic transmission arrangement for power output into a thrust ring of the bowl mill.

Abstract: A pulverizer shaft rotation support assembly includes a rolling element sub-assembly for rotationally supporting the shaft of a pulverizer of a bowl mill of the type which is operative for pulverizing material such as coal into smaller particles, and includes a separator body having a bore, a rotating shaft supported within the bore, and a grinding table supported on the shaft. The rolling element sub-assembly includes an inner race secured to the shaft at a first shaft location, an outer race and a plurality of cylindrical bearings for rolling movement along and intermediate the inner and outer races. The pulverizer shaft rotational support assembly also includes an annular cutout in a gearbox housing structure for radially limiting the outer race while permitting axial movement thereof.

Abstract: A scraper assembly for use with an associated coal pulverizer or as part of a coal pulverizer having a vertical axis with a central hub that rotates during normal operation of the pulverizer. The scraper assembly includes a bracket dimensioned and configured for attachment to the hub of the coal pulverizer that rotates in the normal operation of the coal pulverizer. The apparatus also includes a shaft extending from the bracket. The shaft is substantially horizontal and the apparatus also includes a scraping element pivotally mounted on the shaft. A torsion spring biases the scraping element with respect to the shaft. In some forms of the invention the scraping element comprises a first and second journals engaging the shaft at axially spaced points and the scraping element further includes first and second arms extending radially away from the shaft that are respectively fixed to the first and second journals.

Abstract: A landplaster production method includes the steps of providing a supply of particulate gypsum material, drying the gypsum material by passing a stream of heated air thereby as the material is rotated, classifying and separating the dried particles into fines and coarse particles, collecting the suspended fines in a collector, passing the coarse particles to a grinder such as a roller mill for reducing the particles, and mixing the reduced particles with the collected fines for processing into landplaster. The elimination of fines from the feed to the grinder results in significantly greater production by increasing the efficiency of the grinder. Further, the dryer is modified to agitate the dried gypsum material so that it may be more easily introduced into the classifier/separator situated adjacent the drier discharge outlet.

Abstract: Hot gas is introduced into a fluidised bed of granular material, for example gypsum, contained in a vessel 10 having a grinding device or mill 11 in its lower region, which may comprise grinding rollers 15 cooperating with a table 17 on the base of the vessel. The gas may be supplied through a tube 20 passing down through the vessel, while raw material is fed into the bed, preferably by a feed screw 34. The ground product is discharged from the bed by an overflow 28 which determines the level of the bed.

Abstract: An air-swept mill has an annular space with a blade ring between a rotary grinding pan and a casing wall for fluid delivery flow. The annular space and the blade ring form a gas directing or guiding device for rotary flow and circulation flow of the fluid delivery flow. Above the grinding pan, in the vicinity of a classifier, the casing wall is provided with at least one removal device for removing a part of an outer oversize flow, which is formed as a vented concentrated flow substantially directly at the casing wall.

Abstract: The milling device comprises a milling roller running in a milling ring, wherein the diameter of the milling roller is at least equal to the inner radius of the milling ring. The milling roller is driven by a tangential force. By this arrangement it is guaranteed that the center of mass of the roller runs about the mill's central axis at a constant frequency that does not depend on the wear of the roller or the ring. Furthermore, the axis of rotation of the roller is not tilted during operation such that no torque is generated.

Abstract: A grinding roller for roller or rolling mills, and its method for manufacture. For inexpensive manufacture and for increasing the service life, accompanied by limited repair expenditure, a roller jacket is manufactured in one piece for mounting on a radially inner roller body. The roller jacket has rated breaking points, along which the roller jacket breaks with radially directed breaking faces in the event of a corresponding stressing. By means of a holding device both the roller jacket manufactured in one piece and the optionally formed roller jacket breaking segments are fixed in an operationally safe manner.

Abstract: Reinforcement sections are provided at an outer surface and at an inner surface of a tire for a roll wheel assembly used in a pulverizer for crushing a material such as coal. These reinforcing sections cause the tire to be asymmetrical and are located on the tire only at areas where the wearing of the tire is highly predictable. The reinforcing sections provided on the inner surfaces of the tire are provided directly opposite of the reinforcing sections on the outer surface for preventing the localized thinning of the tire and extending the time interval between rotation and/or replacement of the tires.

Abstract: Raw coal is caused to fall through a coal feed pipe and onto a table so as to be pulverized by a roll. Fine coal particles and coarse coal particles resulting from pulverization are moved upward between an auxiliary classifier cone and a mill casing by hot air supplied from below the mill casing. The hot air (upward stream) carrying the fine coal particles and the coarse coal particles moves across a space of triangular cross section formed between the inverted conical body of the auxiliary classifier cone and the side wall of the mill casing and is forced through blowoff openings defined between deflector plates so as to flow as a lateral rotative stream toward a rotary classifier. Upon impinging the downward-inclined rotating vanes of the rotary classifier, the coarse coal particles are sprung back toward a lower portion of the auxiliary classifier cone and are separated from the fine coal particles.

Abstract: A one-piece pulverizing mill roller assembly and method of rebuilding the same. The roller assembly comprises a body, an integral hub portion and an integral circumferential outside tread portion which mates with an annular groove in a grinding table. The roller assembly is composed of a relatively lower hardness steel which will accept hard surface weld beads to rebuild the circumferential outside tread portion as it wears. The rebuilding can be performed in-place in the pulverizing mill.

Abstract: Improvements are provided for the journals used in rock grinding and similar operations to lubricate the bearings of such a journal in such a way as to prevent contaminants from ever reaching the bearings.

Abstract: An upper grinding conical shaped member rolls around a lower grinding surface, granular material to be ground being fed onto the grinding surface through a hole in the apex of the upper grinding member and being deflected into the path of the upper grinding member by a pip located at the center of the grinding surface.

Abstract: An owl-mill crusher with stationary grinding rollers (6) inside a housing (1) that roll over a grinding bowl (3) resting on a rotating grinding-bowl support (5). An air box (8) is provided below the grinding bowl (3). A circular-conical disk (17) is secured to the grinding-bowl support (5) with its outer edge pointing down. A stationary cleanout arm (24) is positioned above the disk (17) with one end extending into the extraction shaft (20) of the removal container (21), which is mounted on the side of the housing. Several blades (25) are secured to the bottom of the disk.

Abstract: A conical grinding member (2) is caused to move over a grinding surface (1) and material deposited on the surface is ground by a crushing and shearing action. The mill finds particular application in the grinding of grain.

Abstract: A vertical spindle type grinding mill for example for crushing coal comprises upper and lower rings 1, 2 together defining a track for rolling grinding members 3 and yokes 7, 4 bearing against the upper and lower rings 1, 2 for resisting forces tending to separate them. A drive is provided via main shaft 8, for effecting relative rotation between the rings. At least one yoke, preferably the lower yoke 4, bears against its associated ring 2 via interposed elastomeric material 6. This reduces the risk of brittle fracture when using hard relatively brittle alloys for the manufacture of the upper and lower rings so that they have increased wear resistance.

Abstract: The cooperating surfaces defining a pressing nip in a chip crusher are formed with specific patterns to treat the chips by fissuring to facilitate penetration by cooking chemical for the making of pulp for papermaking and the like. One of the surfaces is provided with a plurality of land areas separated by valleys, the land areas being substantially continuous and extending in the direction of movement of the surface as it passes through the crushing nip. The surface cooperates with the surface of a roll which defines the other side of the nip, the roll surface is provided with a plurality of teeth with the crown of each tooth defining a line preferably extending substantially perpendicular to the direction of movement of the roll surface through the nip.

Abstract: A ball mill with a housing (1) that accommodates three stationary rollers (2) rolling along a rotating track (3). The rollers are held against the track by means of an upper and lower frame (9 & 10). The frames have springs (11) between them. Rods (8), each connected to a hydraulic cylinder (24) and extending out of the housing, engage the upper frame (9). To allow the rollers to be lifted off the track, a piston associated with the hydraulic cylinder can be charged at either end, the rollers are attached to the lower frame with hinges 25 and an angle-setting device, and the frames are connected by tension structures that limit the expansion of the springs.

Abstract: An improved mechanism for exerting a downward force on a roller mechanism of a roller mill which includes a fluid actuated piston-cylinder device connected to the rocker arm of the roller by means of a link element pivotally connected at its one end to the piston-cylinder means and pivotally connected at its other end to the rocker arm.

Abstract: Grinding elements of a mill rotating inside a mill housing are sealed off relative to the mill housing by an isolating air chamber. The isolating air chamber is limited by sealing rings abutting against the mill elements and a sealing ring housing. The sealing ring housing is connected to the mill housing. An intermediate insulation is provided between the sealing ring housing and the mill housing. The mill housing is sealed off to the outside by a collar.

Abstract: A roller mill according to this invention includes a table adapted to be rotatably driven on a substantially vertical axis. The table is adapted to receive the material to be milled in a central area around the axis. The table has a substantially horizontal upper surface, and an annular groove is formed in the upper surface radially outwardly from the central area. The groove has a curved bottom surface. A least one roller is provided having an axis of rotation which is above the upper surface of the table and substantially intersects the table axis. The roller extends into and rolls in the groove and has an outer peripheral surface which is curved in cross section. The mill when in use has the table and the roller rotated, and the material extends into a clearance space formed between the peripheral surface of the roller and the bottom surface of the groove.

Abstract: A vane wheel arrangement (30) particularly suited for use in a bowl mill (10) of the type that is employed for purposes of effecting therewithin the pulverization of materials such as coal. The subject vane wheel arrangement (30) which is positioned within the bowl mill (10) so as to be located in the path of flow of the air that in flowing through the bowl mill (10) transports therewith the pulverized material, is operative to effect a primary classification of the pulverized material. Encompassed within the subject vane wheel arrangement (30) are vane means (36) supported on the rotatable grinding surface (14) of the bowl mill (10) for rotation therewith, and a converging/diverging orifice means (38) located in spaced relation to the rotatable grinding surface (14). Both the vane means (36) and the exposed surfaces of the converging/diverging orifice means (38) are formed of a material that is noted for its good abrasive resistant qualities.

Abstract: Two grinding rolls are mounted at a roll carrier. Below the roll carrier a grinding bowl is rotatably mounted on an axial thrust bearing for rotation about a substantially vertical axis. Below the axial thrust bearing there is arranged a drive device for the grinding bowl. A speed reduction gear arrangement is disposed between the drive device and the grinding bowl and contains a substantially cylindrical housing. This housing supports the axial thrust bearing and itself is supported by a substantially ring-shaped flange at a stand or framework at which there is also supported the roll carrier. The flange is connected to the roll carrier by means of a plurality of, for instance, four tie rods.

Abstract: A method particularly suited for manufacturing a pulverizer, i.e., grinding, roll (18) of the type that is designed to be embodied in a bowl mill (10) so as to be operative therein for purposes of effecting the pulverization of a material such as coal through the coaction of the pulverizer roll (18) with another surface with which the bowl mill (10) is provided for this purpose.

Abstract: A nozzle ring assembly for use around a circular grinding path of a roller mill of the kind comprising a grinding table which is rotatable about a vertical axis, and grinding rollers urged against the grinding table. The nozzle ring assembly comprises a nozzle ring with circumferentially spaced guide vanes for directing air, in use, over the grinding path in a direction with a component substantially tangential to the grinding path. The nozzle ring also has a set of annular guide vanes which are disposed one above the other for directing air, in use, substantially horizontally over the grinding path.

Abstract: A process, as well as a device for carrying out same, for grading-separating wet milling of rocks and the like in a mill having a vertical rotational shaft, a milling chamber widening downwards and outwards from a central outlet and one or more milling rollers interacting with the milling chamber, the replenishment of the pulp being done through constant feed. The pulp volume is regulated by displacing the upper edge of the outlet vertically, whereby control of the milling time is achieved so that particles can be kept a longer or shorter time in the milling chamber depending on the milling resistance and structure of the material fed in, thereby effecting a control according to particle type for continued milling of particles which are not completely milled, for example mineral-containing particles, and for discharging from the milling chamber completely milled particles and mineral grains.

Abstract: A ball or grindstone crusher comprises a frame including a support and a table mounted on the frame support for rotation about a vertical axis, and table having arranged thereon an annular track and the frame support extending in a plane below the annular track. Balls or grindstones are rollingly supported on the track and are pressed thereagainst. A first series of bearings supports the table on the frame support and a second series of bearings is disposed at the same level as the first series of bearings. The table has a skirt defining a cylindrical surface coaxial with the annular track and the second series of bearings bears against the cylindrical surface and thereby maintains the table in a stable lateral position with respect to the axis of rotation.

Abstract: A roller mill of the sort with a pan turning about an upright axis, a driving system under the pan and rocking levers, pushing rollers against the pan, has a roller weighting system made up of a hydraulic cylinder, pulling the levers together, and joined with an air accumulator. The cylinder is turningly supported near its center of gravity in one of the levers.

Abstract: A rolling mill having a rotary bowl supported on a casing of a step-down ve transmission has two parallel gear trains leading from a common input shaft to a spur output gear wheel arranged horizontally beneath the bowl. A vertical drive shaft is splined at opposite ends and transmits the gear wheel drive, without relative rotation to the bowl. The bowl is provided with horizontal and vertical bearings which are separate from the bearings of the output gear wheel. The drive shaft, by canting slightly, is able to transmit drive without lateral thrusts from the bowl to the gear wheel. As a result, wear of the gear wheel teeth produced by small misalignments of the axis of the bowl and gear wheel during operation of the mill is avoided and the life of the mill is prolonged. Provision is made for vertical removal of the shaft and the splined diameter at the lower end is less than that at the upper end to facilitate this. Involute teeth are used for the splines.

Abstract: Apparatus for pulverizing coal including a bowl and a cooperating roller between which members the coal is pulverized. The grinding surface of the roller is made up of a removable sleeve which is securely held on the journal bearing housing by means of wedge lock rings located at each end of the sleeve. These wedge lock rings, along with the roller, can be easily assembled, and provide positive locking of the removable sleeve onto the journal bearing housing, even if there are slight irregularities on the tapered surfaces of the sleeve.

Abstract: A grinding roller for roll crushing mills, in which the axle is retained in a roller amount provided with a barrier air connection. The axle, furthermore, carries a roller hub connected with a roller shell, over inner bearings lubricated by splash lubrication. A measuring sensor reaches into the oil sump and is led through a core bore in the axle. End faces of the axle are surrounded by covers placed on the roller hub and on the roller mount while leaving gaps. Bores connect the respective gaps with the core bore, and these bores pass from both facing ends through the axle. One of the bores extending out from the rspective gap facing the interior of the mill, passes above the oil level and parallel to the oil surface. An extension pipe having a ventilating filter therein, is placed on the bore line on the side of the roller mount.

Abstract: A vertical roller mill resting on a mill foundation is disclosed in which a rotatable grinding table having an endless grinding path is driven by a driving mechanism located beneath the grinding table and in which the grinding table rotates on bearing means which are mounted on generally vertical support means, the support means positioned beneath the grinding path of the grinding table to support the grinding table and to transmit grinding pressures and vibrations from the grinding table downward directly to the mill foundation while substantially avoiding transmission of the pressures and the vibrations to said driving mechanism.

Abstract: A vertical roller mill is disclosed for grinding material. The roller mill includes a rotatable grinding table at least one grinding roller resting upon the grinding mill, a pressure frame secured to the grinding roller and a housing which surrounds these elements. A guide mechanism pivotally connected between the pressure frame and the housing resiliently restrains movement of the pressure frame with respect to the housing and thereby reduces the transmission of forces from the pressure frame to the housing.

Abstract: A bowl mill for pulverizing coal, wherein two bowl surfaces are rotated on the same shaft. The raw crushed coal is pulverized in one of the bowls, and the pulverized coal therefrom is then transported in an air stream to a classifier from where the fines are carried on to the ultimate point of use, and the more coarse particles are discharged into the second bowl for further grinding.

Abstract: An apparatus is provided for pulverizing material into comminuted particles in which at least three rollers are mounted for rotation and maintained in contact with the material on a grinding ring. The rollers are suspended in a manner to allow the rollers to swivel about respective vertical axes perpendicular to their respective axes of rotation.

Abstract: The invention concerns a method of influencing the degree of grinding of material which is fed into the peripheral portion of the grinding chamber of a mill whose inclined and upwardly-divergent open bowl or plate-shaped grinding chamber has a central outlet for ground material, said mill having a heavily inclined rotary shaft and at least one cooperating roller in the grinding chamber. The degree of grinding, which corresponds to the retention time of the material in the grinding chamber, is controlled by adapting the rpm of the mill and the incline of the rotary shaft, so that material in the section of the grinding chamber most inclined toward the horizontal plane slides downward toward the central outlet in steps corresponding to the desired degree of grinding.

Abstract: A pulverizer having four hydraulic drive motors for rotating the grinding ring or bowl. The motors are mounted so as to be easily accessible, so that one or more can readily be removed for repair during which time the pulverizer can remain in operation. The speed of rotation of the grinding bowl can be varied by either changing the pressure of the driving hydraulic fluid, or by stopping the supply of fluid to one or more of the motors.

Abstract: A chip crusher composed of a rotating disc and at least one crushing roller mounted to form a nip with a working face of the disc adjacent the periphery of the disc. The chips pass through an inlet and engage the rotating disc which flings them towards the periphery of the disc thereby to spread chips into a substantially single thickness layer. Each chip moves with the disc into the nip between the roller and disc wherein the chip is crushed. The crusher fissures the chip to a degree substantially proportional to the original chip thickness and thereby produces crushed chips having more uniform pulping qualities than regular chips.