Abstract: A grinding roller for vertical axis crushers is disclosed herein that is produced by foundry casting of a metal matrix. The roller includes a plurality of reinforcing inserts on its periphery, wherein some portions of the peripheral surface of a same insert are located at a distance d1 or d2 from the work surface depending on wear stresses. Accordingly, the roller has at least one zone experiencing high wear stress Z1, with at least one portion of the insert positioned at a distance d1 near the work surface of said roller; and a zone with low wear stress Z2, with a portion of the insert positioned at a distance d2 that is set back relative to the work surface of the roller. In some examples, distance d1 is less than distance d2.

Abstract: An exemplary door has a hollow interior, and includes a first panel and a second panel that are secured to one another such that a gap is formed therebetween. Each panel has an interior side that faces the hollow interior and an exterior side that is exposed to view. The door further includes a protective coating system that is disposed on the interior side of at least one of the panels. The coating is formed of a two-part elastomeric composition, such as a two-part elastomeric polyurethane composition or a two-part elastomeric polyurea composition. The coating improves the thermal, acoustic, and/or ballistic performance characteristics of the door.

Abstract: A gearing arrangement for a vertical mill includes a central shaft mounted for rotation about a vertical rotation axis, a spur gear arranged in fixed rotative engagement on the central shaft, and an output flange rotatably coupled to the central shaft. At least one gear unit having gear pairs is arranged vertically below the output flange, with a pinion gear arranged on an output side of the gear unit for engagement into the spur gear on the central shaft. The gear unit is arranged on a traversing mechanism in such a way that the pinion gear on the output side is movable in relation to the spur gear to engage in and disengage from the spur gear, as the gear unit is moved by the traversing mechanism.

Abstract: A water bonding fixture is provided herein which includes a shaft and a plurality of electrically conductive plates disposed at one end of the shaft and spaced apart from each other so as to provide a gap between adjacent plates. Each electrically conductive plate defines two planar surfaces each of which are substantially exposed and each electrically conductive plate is electrically connected to each other electrically conductive plate to provide a surface area of conductive surface approximately equal to the exposed surface area of all of the electrically conductive plates. The water bonding fixture is preferably used in conjunction with swimming pool equipment such as pool pumps, skimmers and filters.

Abstract: A water bonding fixture is provided herein which includes a shaft and a plurality of electrically conductive arcuate shaped plates disposed at one end of the shaft and spaced apart from each other so as to provide a gap between adjacent plates. The water bonding fixture is preferably used in conjunction with swimming pool equipment such as pool pumps, skimmers and filters.

Abstract: A roller mill (1) for grinding particulate material such as cement raw materials, cement clinker and similar materials, said roller mill (1) comprising a substantially horizontal grinding table (3) and a set of rollers revolving about a vertical shaft (5); said set of rollers comprising a number of rollers (4) rotating about respective roller shafts (6) which are connected to the vertical shaft (5) via a hinged connection (7) which comprises a bearing shell (14) and a bearing journal (15) resting therein, said hinged connection (7) allowing a free arcuate movement of the roller (4) in an upward and downward direction in a plane including the centreline (12) of the roller shaft; and said set of rollers (4) being configured for interactive operation with the grinding table (3); characterized in that the bearing shell (14) of the hinged connection (7) has a diameter which exceeds that of the bearing journal (15) resting therein by a factor of at least 1 percent.

Abstract: The invention relates to a method for comminuting material to be ground having a roller mill which has a mill platen, at least one mill roller and at least two drives for driving the roller mill, with there being provided a power compensation control system for the drives which controls the power of the drives at a predetermined ratio relative to each other by the speed of at least one drive being controlled.

Abstract: A roller mill 10 for pulverizing fine material has a grinding mechanism that includes a plurality of grinding rolls 64 and a grinding ring 66 that coact to pulverize material within a mill housing. The grinding ring has an inner grinding surface wherein the inner surface includes an upper vertical portion and inwardly sloped lower portion. The lower portion of the ring provides a means for retaining more fine particles on the ring during pulverizing, as well as an increase in grinding surface. The grinding rolls have a generally cylindrical shape with an outer grinding surface that includes an upper vertical portion and a lower portion of the outer grinding surface. The outer grinding surface of the roll is complementary to the inner grinding surface of the grinding ring.

Abstract: The invention relates to a vertical mill comprising a grinding track (1) and at least one grinding roller (2). The grinding track (1) is provided with a central zone (Ia) made of a harder material and two laterally adjacent edge zones (Ib, Ic) made of a softer material. The width (a) of the central zone (Ia) is smaller than or equal to the width of the grinding roller (2).

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

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: The invention relates to a grinding method and to grinding apparatus using a ring mill, in which the air speed in an air ring surrounding the grinding track is chosen to be sufficiently low that a proportion of the material which has already been comminuted to the fineness of the finished product also falls downwards against the air stream and through the air ring, is mechanically elevated and subjected to separation, the resulting tailings being delivered back to the grinding track of the ring mill. Such a solution is distinguished by a substantially reduced pressure loss and accordingly a considerable saving of energy.

Abstract: A skew rolling mill is equipped with a plurality of skew or inclined rollers each of which is constructed of a number of roller segments (1', 2) which are interconnected in a form-locking, force transmitting manner. These roller segments are so related to one another that different roller segments may be assembled to form a plurality of different skew rollers which differ from one another with regard to their calibration and purpose. Thus, different roller segments may have different structural features and they may be made of different materials. Such variability obviates the need for keeping complete sets of skew rollers in stock for each size or calibration.

Abstract: Apparatus for grinding coal to micron fineness having a grinding chamber with a grinding surface supported by a circumferential wall in the grinding chamber, a plurality of grinding rolls orbiting in the grinding chamber for grinding the coal, air supply bustle surrounding the grinding chamber, air flow restrictor means opening from the air supply bustle to the grinding chamber to create a back pressure in the air supply bustle for substantially evenly distributing the air supplied to the grinding chamber around the circumference of the grinding chamber, and wherein the restrictor means directs the air flow tangentially relative to the circumferential wall of the grinding chamber so that the coal particles are caught up in a cyclonic movement having a large initial horizontally directed force to maintain a body of coal particles in the orbit of the grinding rolls, which horizontal force gradually diminishes as the vertical force component of the air flow lifts the ground coal particles out of the grinding cha

Abstract: Apparatus for lubricating the sealing rings of grinding roll bearings comprises an oil-containing vessel located at a level higher than that of the grinding roll bearings and connected via an oil conduit to an annular gap between the sealing rings. The oil conduit is disp osed within an air line which delivers air to the gap.

Abstract: Mixing equipment includes a mixing compartment and at least one mulling assembly for dispersing therein material, including granular material, such as foundry sand. An agitator is provided for improving the mulling and aerating of the dispersed material within the compartment. The agitator includes a rotor rotated about an upright axis disposed within a cavity opening into the mixing compartment. The rotor includes a hub disposed within the cavity and having a plurality of fingers extending outwardly therefrom. Upon rotation of the rotor, the fingers move forcibly out of the cavity and into the mixing compartment to impact the material moving therepast, for mixing and aerating the material. An overflow discharge opening in a side wall of the compartment permits the prepared material to be discharged continuously from the mixing compartment. The supply of material to the compartment and the discharge of material are under the control of door, material consistency sensing, and timing apparatus.

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: A splash lubricating system for supplying oil to an interior reservoir for the bearings of grinding rolls, comprises an interior oil supply reservoir formed in the hub of the grinding rolls and at least one exterior oil supply line is connected from an exterior reservoir to the interior reservoir of the hub. Oil level indicating means are associated with the exterior oil supply reservoir for indicating changes of oil levels in the interior reservoir and for stopping the driving of the rolls if the oil level should fall below a predetermined amount. Two such exterior reservoirs may be provided, and one is advantageously connected to a separate oil supply tank for replenishing the oil in the interior reservoir of the grinding roller.

Abstract: A method of processing abrasive material, the material being comminuted by means of a roller mill, thereafter sifted in an air separator, and the course material which is collected in the air separation again being comminuted in the roller mill. Furthermore, the invention relates to an apparatus for carrying out said method.

Abstract: A comminution device in which a crushing mass having an outer surface of helical configuration is mounted on a rotary support which rolls the crushing mass around the interior surface of a crushing chamber. The helical surface provides improved comminution. The rotary support is a flexible wire rope which permits limited radial movement of the crushing mass, allowing centrifugal force to aid the comminution. The crushing mass is mounted at about the midpoint of the wire rope, allowing gyroscopic forces to further assist the comminution.

Abstract: A roll crushing mill comprises rollers rollable in concentric, trough-like grinding tracks. Material to be crushed is delivered to the innermost track in the path of the associated rollers. Crushed material passes from the innermost track over a vertically adjustable barrier ring into the outer track in the path of the associated rollers. Crushed material passes out of the outer track over a further barrier ring which also may be vertically adjustable.