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 coal mill introduces raw coal between a roller and a ring and pulverizes the raw coal. A reduction gear for a mill is provided in a lower portion of the coal mill. A cooling fan is mounted to an input shaft of the reduction gear for the mill which is connected to a motor. A radiator for cooling a lubricating oil which lubricates within the reduction gear for the mill is arranged in an extending portion of the input shaft. An oil pump and a line filter are provided in a lubricating passage which supplies the lubricating oil to the radiator, and a flexible pipe connects between these elements. Accordingly, the coal mill is cooled by air.

Abstract: The invention relates to a roller mill with a rotary grinding bowl, grinding rollers rolling thereon and retaining devices for influencing the grinding material movement between the grinding rollers. For increasing the throughput of a low-cost roller mill, low-cost, effective retaining devices are provided between the grinding rollers and are in each case constructed as a rotary damming wall formed from one or more damming rolls. The damming rolls have damming faces, which block the outwardly moved grinding material and retain same for further grinding. In a first embodiment a damming face is constructed on the inner end face of a damming roll. According to a further development radially projecting damming rings with additional damming faces are fitted.

Abstract: A packing for preventing leakage of air between a rotating yoke of a coal pulverizer and an annular seal surrounding an extension of the yoke. The packing is a ring of compressible graphite. A band encircles the graphite ring and clamps it tightly against the yoke extension and against the seal.

Abstract: The invention relates to a roller mill, particularly a modular air-swept mill, with a rotary grinding pan on which roll grinding rollers and having columns, on which are mounted by means of rockers the grinding rollers, the columns being in each case fixed to a foundation frame and arranged as a mill foundation frame. For the use of stable and torsionally stiff columns for relatively large roller mills, according to the invention the foundation frames of the columns, together with the connecting frame parts are arranged in a mill foundation to form a circumferential foundation frame, particularly a polygonal or U-shaped frame. A gear foundation frame is located in the mill center separately from the circumferential frame and permits the construction of a different level of the particular areas of the mill foundation.

Abstract: A track for mills including a series of inner wearing segments and a series of outer wearing segments with a high resistance to wear. The upper surface of the inner wearing segments and the outer wearing segments provide two concentric circular runway paths moving beneath milling rollers in order to mill material tipped out onto the track. The inner and outer wearing segments are fixed removably to a sole with an outer edge and an inner edge defining a housing for the wearing segments.

Abstract: In a method of grinding a printed circuit board, a printed circuit board having various parts mounted thereon, or a residual ground product produced in the manufacturing process for the boards, and recovering valuable substances by separating the ground product into a portion containing a large amount of metal component such as copper and a portion consisting a resin, a filler material, and the like through a separation step, the separation step includes a specific gravity separation step of separating the ground product into a portion containing a large amount of substance having a high specific gravity and a portion containing a large amount of substance having a low specific gravity, and an electrostatic separation step of separating the ground product into a portion having a large amount of conductor and a portion containing large amount of insulator. The grinding step includes a coarse grinding step and a fine grinding step.

Abstract: A solids pulverizing mill for producing fine particles such as coal dust, which includes a housing having a centrally located coal feed chute and enclosing an annular-shaped air port ring containing multiple nozzles located around a rotatable grinding table. Multiple grinding rollers press down and rotate upon the coal on the rotatable grinding table so as to pulverize the coal, which is then entrained by multiple intersecting and strongly interacting air jet streams upwardly from the grinding table through a classifier section to an exit conduit. The air port nozzle ring is fitted with multiple angled flow passages from which adjacent air jet streams intersect and interact strongly with the adjacent streams to product intense turbulence, which prevents undesirable acoustic vibration of the upflowing air/coal material within the mill housing. The centerlines of adjacent air jet nozzles intersect at an included angle of at least 20.degree. and not exceeding 90.degree.

Abstract: The invention relates to a method and an apparatus for crushing material of different grain sizes, particularly an air-swept mill. From the method standpoint there is a regulation of the fluid feed flow in the vicinity of a blade ring and with adjustable reinforcing cladding segments, so that grinding material particle flows are moved in a flow envelope, particularly in a hyperboloid torus. From the apparatus standpoint, stationary and adjustable reinforcing cladding segments are arranged as a function of the grinding rollers rolling on a grinding pan. Using adjusting devices, acting on connecting areas of the reinforcing cladding segments, it is possible to bring about a horizontal or radial adjustment and/or an inclination adjustment of the reinforcing cladding segments for regulating the fluid feed flow from the outside and in continuous manner during a crushing process.

Abstract: A high performance classifier system for use in a pulverizer mill (e.g., a mill used to crush large coal particles into small particles). The classifier system includes a cylindrical extension member with a roughened interior surface. Other permitted features include a converging/diverging orifice on the interior surface of the mill body, curved classifier vanes at the upper end of the classifier, and tilted vanes between the mill housing and the upper end of the classifier. Improvements in efficiency of particle separation are achieved.

Abstract: A process for determining the profile of the surface of the lining of the grinding bowl of a rolling mill in which the constant change in the angle .alpha. of the grinding bowl that is necessary for accelerating transport of the product being ground is calculated as a correlation of the distance to the turning point of the rolling mill for several radii, the frictional value between the grinding rolls and the grinding bowl lining and the rotational speed of the grinding bowl being constant values in calculation.

Abstract: A plunger can structure and a mated spring compressor system. The plunger can includes a plunger tip and an indicator rod extending from the plunger tip through the plunger can and out the opposite end of the plunger can. Removal and replacement of a shim between the plunger tip and the roller assembly which adjust the force on the roller assembly, can be easily accomplished without opening the clamshell doors to the mill by drawing the indicator rod out of the opposite end of the plunger can to effect a drawing in of the plunger tip.

Abstract: A spring canister for use in a coal pulverizer to impart an axial load to a bracket assembly supporting a grinding wheel or roller. The axial load causes the bracket assembly to pivot downwardly to increase the grinding force between the wheel or roller and the grinding bowl.

Abstract: A vertical roller mill which maintains a predetermined milling capacity for a long period of operation is disclosed. The outer portion of the grinding face of a milling roller is chamfered with respect to a tangent drawn at the point at which chamfering of the grinding surface of the milling roller begins and/or the outer portion of the surface of a table liner is chamfered with respect to a tangent drawn at the point at which chamfering of the surface of the table liner begins. Through this structure, a milled material is smoothly discharged to the outside of the milling table, and an otherwise possible overload to the vertical roller mill is prevented. Further, the wide and shallow abrasion pattern resulting from the use of this structure means the vertical roller mill can maintain a predetermined milling performance for a long period of operation.

Abstract: A pulverizer for crushing coal for use in a combustion process includes a bowl shaped body, a roller dimensioned and configured for contact with at least a portion of the bowl shaped body, apparatus for causing relative movement between the bowl shaped body and the roller; and apparatus for biasing the roller against the bowl shaped body, the apparatus for biasing including a spring assemblyat includes a first spring and a second spring. The apparatus means for biasing including apparatus allowing initial compression of the first spring before the second spring is compressed. In some forms of the invention the first spring and the second spring are coil springs and the first and second springs are compressed simultaneously after initial compression of the first spring. In other forms of the invention the first and second springs are disposed in coaxial relationship with the second spring overlapping an axial part of the first spring.

Abstract: The invention relates to a roll mill having at least one pair of grinding rollers bearing against a substantially horizontal surface of a grinding table which is rotatable about a vertical axis. The rollers are mounted at one end of a roller support the opposite end of which is guided by guide lugs slidable vertically in guides and linked to the roller support by a tension rod. In order to achieve particularly smooth running of the grinding rollers on the grinding surface, the guides and the guide lugs lie approximately at the level of the grinding surface.

Abstract: A removable rotating annular passage segment having a removable vane design is achieved by welding individual carbon steel parts into place. A welded passage segment having rails secured by a plurality of ribs is mounted to the grinding table of a pulverizer. Casted vanes are detachably mounted to the welded passage segment and are refitted when worn. The outer wall is adjustable and replaceable because it is welded to the pulverizer. Flow contour plates are welded to both the inner rail and outer wall.

Abstract: A material reducing mill having a construction which operates to create a circulation of material in the mill to effect a thorough reduction of material added to the material undergoing reduction. The mill is further constructed with a rotary device which is associated with an external collection system, which device constantly samples the circulation in the mill so as to withdraw that portion which can be fed into the collection system. Furthermore, the external collection system is provided with sensors which are adapted to regulate the circulation of the material intended to be reduced to micron size portions.

Abstract: An improved annular passage arrangement for a pulverizer includes vertically extending inner and outer passage walls which define the annular passage divided by vanes extending at an acute angle to the horizontal. The annular passage is divided into a plurality of passage ports and a low pressure drop is experienced as compared to the prior art passage arrangements. The inner and outer passage walls may be connected to each other and rotate together with the vanes and the vanes are advantageously shorter in length then was conventional for further reducing pressure drop.

Abstract: An annular passage arrangement for a pulverizer includes vertically extending inner and outer passage walls which define a "boxed" annular passage. The annular passage space has an inlet for receiving flow from an air plenum and an outlet for vertically channeling the flow into a pulverizing zone. The annular passage is divided by vanes having a tapered end at the inlet end of the passage and an outlet end located at the passage outlet. The outlet end of each vane extends at an acute angle to the horizontal and the tapered end of each vane is vertically oriented within the annular passage. This vane orientation reduces pressure drop as the plenum air is fanned up into the pulverizing zone. Flow contouring plates below the passage inlet reduce flow disturbances and create a more uniform flow pattern up and into the passage inlet.

Abstract: The invention relates to an air flow rolling mill for comminuting hard minerals such as slag or cement clinker. The discontinuities in operation occurring with high fineness levels are overcome in that with the grinding rollers are associated compression rollers for making the grinding bed uniform.

Abstract: A substantially one-piece cast plunger can structure and a mated spring compressor system. The plunger can includes a removable plunger bearing on one end that is attached to the plunger can with both interlocking lugs and bolts and is designed for removal with a spring compressor that holds it in place.

Abstract: Vibration in the operation of a rolling mill is minimized by mixing unground raw material with partially ground material being recirculated in such a manner that the material fed to the bowl of the mill is homogeneously mixed whereby variations in the frictional forces within the bowl will be reduced. If necessary, the moisture content of the mixture being fed into the mill bowl may be increased to ensure that the grinding operation is performed efficiently.

Abstract: An improved rotating throat/air port ring assembly is described for use in a pulverizing mill of the type including a rotating bowl member in a housing. The improved assembly includes (1) a vaned throat/air port ring element secured to the periphery of the bowl and including vanes which are tilted 20.degree. to 40.degree. from vertical, (2) an inclined liner extending around the bowl above the ring element, and (3) a skirt extending outwardly and downwardly from the ring element to guide inlet air through the vaned throat/air port ring element.

Abstract: The invention relates to a grinding surface of rolling mills and specifically to the grinding surface of grinding rollers and a grinding path. As the hitherto known solutions have been considered inadequate for increasing the surface life of grinding surfaces, use is now made of ceramic segments as a wear-preventing cladding and they are also fixed against dynamic stressing forces on the body or basic shell.

Abstract: A roller mill has a mill housing having a vertical axis. A coaxially aligned grinding track is arranged concentrically about the vertical axis and supports a plurality of grinding rolls. The mill housing is divided into a force-conducting housing part which absorbs horizontal grinding reaction forces and an air-ducting housing part which contains an air-ducting chamber and is mounted below the force-conducting housing part. The force-conducting housing part is supported on the foundation by supports. The air-ducting housing part is detachably secured to the force-conducting housing part and independently supported on the foundation by brackets and bearing supports.

Abstract: A grinding mill comprising a mill cylinder, a vertically mounted main shaft coupled at the lower end to a motor mounted on the lower side of the mill cylinder to be driven thereby and extending along the axis of the mill cylinder, and means mounted in descending order on the main shaft including a finished product conveying means, a classifying means, a grinding roller means and a decelerating means, a fixed sleeve fixed on the bottom of the mill cylinder to support a rotary bushing by means of bearings, a circular seat portion and a support seat fixed to the upper end of the rotary bushing, wherein the support seat is fixed with a grinding ring, a plurality of grinding rollers are rotatably provided inward of the grinding ring, a clearance is formed between the grinding ring and the grinding rollers, wherein a plurality of radially extended sweeping sheets are provided outside of the circular seat portion for sweeping the material fallen upon it away from the mill, and wherein an air inlet duct is provided a

Abstract: A pulverizing mill for particulate material such as coal, containing a plurality of roller units each pivotably attached to the mill casing. The roller units are each biased downwardly against a rotatable table and annular track by dual loading arms which are pressed downwardly by spring means located outside the casing. The spring means are provided either by coil type springs contacting the loading arms, or are provided by the loading arms being fixed at their outer ends to the casing so as to act as curved torsional spring arms to provide a downwardly force on the roller units. The roller unit pivot shaft is advantageously attached to the casing at a level below the roller axis.

Abstract: There is disclosed a vertical mill comprising a rotatable table and rotatable grinding rollers disposed on the upper surface of the table near the outer periphery of the table. Raw material is supplied to the central portion of the table. A given grinding pressure is applied to each grinding roller to crush the raw material between the upper surface of the table and the outer surface of each grinding roller. Rotatable auxiliary rollers are arranged alternately with the grinding rollers on the upper surface of the table near the outer periphery of the table. The layer of the material caught by the grinding rollers are compacted by the outer surfaces of the auxiliary rollers. There is also disclosed a method of operating the vertical mill. The method consists in separating controlling the grinding pressures applied to the grinding rollers according to the loads on the grinding rollers.

Abstract: The invention relates to a roller mill with a mill casing having a vertical axis, a grinding table rotating therein about the casing axis and two grinding rollers which roll on the grinding table and are held stationary by a roller carrier. This roller mill is intended in particular for small throughput capacities, and both grinding rollers are rigidly connected by their spindles to one another and to the roller carrier which passes diametrically through the mill casing and is flexibly and resiliently mounted or supported at its ends. In this way a simple and robust, reliable construction is produced.

Abstract: This invention relates to a roller mill in which the shafts of the grinding rollers are mounted in two self-aligning roller bearings of which one forms a fixed bearing and the other is constructed as a vertically movable floating bearing. Such a roller mill is distinguished by a standard design which is economical to produce and can be equipped with a variable number of grinding rollers.

Abstract: In the vertically oriented generally cylindrical coal pulverizers that are widely employed to supply a coal-air dispersion to the combustion zones of boilers producing steam for the turbines of electric-power plants, forced-air requirements are reduced and coal fall-back and resultant coal fires are substantially eliminated by the novel throat ring of invention. A throat ring surrounds circumferentially the coal grinding assembly of each such pulverizer and contains a plurality of angularly disposed air channels through which air is forced upwardly into contact with pulverized coal thrust centrifugally from the said assembly causing the coal-air mixture to swirl upwardly to means directing the mixture to the said combustion zones.

Abstract: An improved vertical roller mill for comminuting solid materials which includes a horizontal grinding table and cooperating grinding rollers and an improved apparatus for exerting a downward force on the grinding roller. This apparatus includes an external hydraulic piston-cylinder force exerting apparatus with a pair of link members external to the mill with a first link member in tension and a second link member in compression. The compression link is pivotally connected to the mill body and the force exerting apparatus and the tension link is pivotally connected to the force exerting means so that when the cylinder of the piston cylinder means moves down, the linkage mechanism results in a downward force on the grinding roll.

Abstract: A method and apparatus for making ice cubes is disclosed wherein a large number of ice trays or liquid trapping elements are placed in a larger container, liquid added to the larger container to a level which will fill the liquid trapping elements when the container is positioned in an ultimate storage position and in the ultimate storage position, all the liquid not trapped in the trapping elements is drained. Apparatus disclosed is a container for closely receiving a plurality of ice trays and a lid with a closeable drain opening. A closeable opening is shown in a container wall. Racks can be provided on one container wall and the container can be made of insulating material.

Abstract: A pulverizer auxiliary lubrication system (12) particularly suited for use with a pulverizer bowl mill (10) of the type that is operative for effecting the grinding of material. The subject auxiliary lubrication system (12) is designed to be employed to supplement the pulverizer bowl mill's (10) existing lubrication system (48) whereby the beneficial features of the latter are retained while the disadvantages thereof are eliminated. To this end, the subject auxiliary lubrication system (12) includes an oil pump (72), an electric motor (74) coupled (76) to and operative for driving the oil pump (72), one or more filters (78), a pressure relief valve (80), connecting piping (82, 84, 86, 88), gauges (68, 94, 96) and controls (90, 92, 98, 100, 110), and means to supply oil to (86, 88) and draw oil from (82, 84) the pulverizer bowl mill (10).

Abstract: A mechanical spring journal assembly (20) particularly suited for use in a bowl mill (10) of the type that is employed for purposes of effectuating therewithin the pulverization of material such as coal. It is through the operation of the subject mechanical spring journal assembly (20) tht there is established the magnitude of the forces which the grinding rolls (18) of the bowl mill (10) apply to the coal for purposes of accomplishing the pulverization of the coal.

Abstract: A combination inerting and fire extinguishing system particularly suited for employment in a pulverizing bowl mill (10) of the type that is operative for effecting the grinding of material and that includes a substantially closed separator body (16) in which a grinding table (18) is supported for rotation relative thereto and a plurality of grinding rolls (22) are also supported therewithin such that the plurality of grinding rolls (22) cooperate with the rotating grinding table (18) to effect a grinding of the material disposed upon the grinding table (18). The subject inerting and fire extinguishing means includes a continuous purging means, a backup inerting means, a pulverizing bowl mill clearing means and a water injection fire suppression means. The continuous purging means is operative during any inerting sequence to cause an inerting medium to flow continually through the pulverizing bowl mill (10) so as to ensure that there is no buildup of volatile gases therewithin.

Abstract: A roll-and-race pulverizer is disclosed in which the throat vanes are mounted for rotation in the direction of rotation of the grinding ring.

Abstract: A fixed roller pulverizing mill wherein there is comparatively little wear, vibration or other adverse characteristics and wherein a uniform fineness of the ground material is maintained. The rollers, which do not move substantially in a horizontal direction, bear down on a rotating table, contacting the table at a circular trough therein and are individual spring biased to improve the performance of the mill.

Abstract: A coiled spring system (20) particularly suited for use in a bowl mill (10) of the type that is employed for purposes of effectuating therewithin the pulverization of material such as coal. It is through the operation of the subject coiled spring system (20) that there is established the magnitude of the forces which the grinding rolls (18) of the bowl mill (10) apply to the coal for purposes of accomplishing the pulverization of the coal. The subject coiled spring system (20) includes stud bearing housing means (36), preload stud means (38) suitably supported from the stud bearing housing means (36), pressure spring means (40) positioned in surrounding relation to the preload means (38), and spring housing means (42) encircling the pressure spring means (40).

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: A roll-and-race pulverizer is disclosed in which the throat vanes are mounted for rotation in the direction of rotation of the grinding ring.

Abstract: A roller mill according to this invention includes a base and a table supported on the base, the table being adapted to be rotated on a generally vertical axis. The table has an annular groove formed in its top surface, the groove having a semicircular cross section. At least one roller is supported by the base above the table, each roller being rotatable on an axis which intersects with the vertical axis of the table. Each roller has an arcuate peripheral portion which forms part of a circle of curvature in cross section. The roller and the table rotate on their respective axes, and they are adapted to compress and mill material in the groove betweem them, a clearance which receives the material being formed between the peripheral portion of the roller and the groove.

Abstract: A pneumatic system for exerting a downward grinding force on the roller assemblies of a roller type grinding mill. The pneumatic system consists of a plurality of resilient and flexible pneumatic cylinders or bellows operatively connected through a crank arm, a horizontal rotatable shaft and lever to the roller assembly. The flexible pneumatic cylinders exert an upward force on the crank arm which in turn exerts a downward force through the rotatable shaft and lever on the grinding roll. Vertical movement and vibration of the roller assembly is absorbed by the flexible cylinder to maintain a steady grinding force on the rollers.

Abstract: A roller mill in which raw material fed between the upper surface of a pulverizing table and a pulverizing roller is pulverized by compression therebetween, wherein at least one annular recess coaxial with a roller shaft being formed on the pulverizing roller, thereby attaining reduction of self-excited vibrations of the roller mill and improvement of the pulverization efficiency. Further, in order to enhance these effects, the depth of the recess is set larger than the average grain size of the raw material. Moreover, the gap between the pulverizing table and the pulverizing roller has a wedge-like sectional shape which becomes narrower toward the outside of the pulverizing table, whereby the raw material which has been pulverized by compression between the table and the roller is prevented from escaping in the axial direction of the roller shaft, thereby attaining reduction of the self-excited vibration and improvement of the pulverization efficiency.

Abstract: A vertical type roller mill for grinding a material including a grinding table and grinding rollers of a tire shape in contact with each other. The grinding table has a grinding surface composed of a surface portion constituting a portion of an imaginary conical surface having a apex located on a center axis of the table, and a curving surface portion located outwardly of and contiguous with the surface portion constituting the imaginary conical surface. The grinding rollers each have a grinding surface composed of a surface portion constituting a portion of another imaginary conical surface sharing the apex with the first mentioned conical surface, and a curving surface portion located outwardly of and contiguous with the surface portion constituting a portion of the last mentioned imaginary conical surface and having a greater curvature than the curving surface portion of the grinding surface of the grinding table.

Abstract: An apparatus for cutting scrap tires and other waste products is disclosed. The apparatus includes a frame having a cylindrical anvil roll rotatably mounted therein. A blade roll is also mounted in the frame for rotation about an axis parallel to the rotational axis of the anvil roll, and a plurality of axially spaced roller blades of predetermined diameter are fixed to the blade roll and rotatable therewith. The blade roll is also provided with a pair of axially spaced thrust wheels, with the thrust wheels being positioned outboard of the blades and being equal to or slightly greater in diameter than the predetermined diameter of the blades. Driving means are provided in the apparatus for rotating the anvil roll and the blade roll in opposite directions in such a manner that scrap tires fed to the rolls will be drawn inwardly into the nip formed between the rolls and will be cut between the blades and the anvil.

Abstract: A journal bearing system (50, 52) particularly suited for use in a bowl mill (10) of the type that is employed for purposes of effecting therewithin the pulverization of material such as coal. The function of the subject journal bearing system (50, 52) is to provide the bearing support for the journal shaft (22, 54) on which the pulverizer roll (20) is mounted that through the coaction thereof with a suitable surface (14) provided for this purpose effects the pulverization of material.

Abstract: There is disclosed a grinding crusher having a grinder piece disposed within a crushing chamber for relative rotation with respect to a casing defining the crushing chamber. The casing is journaled and driven in high speed rotation so as to cause a material within the casing to be centrifugally pressed against the inner peripheral surfaces thereof.

Abstract: Jacks are positioned about the base of a coal pulverizing bowl mill to elevate the separator housing which contains and supports the journal rolls. The separator housing is raised by the rollers attached to the jacks. Once raised, the housing is rotated to sequentially position the access door of each journal roll to the front of the mill. A mobile crane conveyance is stationed at the front of the mill to remove and replace each journal roll through its access door.