Abstract: A grinding roller is configured so that the fatigue strength of a roller housing can be ensured, and product life can thus be ensured. The grinding roller includes: a roller housing; a roller main body; a pressing plate; a tab hole; and a tab. A line at which fastening stress caused by the pressing plate is concentrated on a base portion of a fixing stopper part of the roller housing and a line at which stress caused by a grinding load received by the roller main body is concentrated on a base portion of the tab hole of the roller housing are disposed in an offset manner so as not to intersect each other.

Abstract: The invention relates to a milling bowl, in particular for vertical mills, and to the production of such a milling bowl. Milling bowls of this type have hitherto typically been produced from a cast material as a single piece. Due to the increasing size of said milling bowls, said milling bowls can generally only be transported to the destinations by means of special transport. Therefore, the invention creates a milling bowl consisting of assemblies, wherein a double-walled center part formed from two housing shells is provided between a head flange and a base flange. Said center part forms a cavity, which is filled with a curable casting compound such that a rotationally rigid milling bowl is present after the casting compound has been cured.

Abstract: A method for drive control of a vertical mill having a grinding plate rotatable about the vertical axis by a drive train composed of an electric motor and a gearbox is disclosed. At least the electric motor and the grinding plate represent inertia elements in a system that can oscillate and are connected by the gearbox operating as a torsion spring element. A variation in the rotation speed of at least one of the inertia elements is measured, and the electric motor is governed by a controller that minimizes the measured variation in the rotation speed. The controller is parameterized for governing the electric motor so as to minimize maximum reaction torques resulting in the gearbox when applying a sinusoidal excitation.

Abstract: An augmented-reality system has canted waveguides. The waveguides are canted at a wrap angle and/or a tilt angle. Input couplers to the waveguides are designed differently because of the different cant angles. Having canted waveguides allows waveguides to be formed in glasses and/or sunglass that have a base curvature.

Abstract: A vehicle and its air-conditioning air distribution device for a vehicle turret rotatably mounted with respect to a body of the vehicle. This device includes at least one annular chute coaxial to the axis of rotation of the turret and including at least one first flow orifice, the chute having an annular opening which is concentric thereto, the chute receiving a closing ring which matches with the opening of the chute, the closing ring being rotatable with respect to the chute, and including at least one second air flow orifice, the chute being intended to be made integral with the body, respectively with the turret, while the closing ring is intended to be made integral with the turret, respectively with the body.

Abstract: A coal pulverizer monitoring system and method measures a displacement of wheels in a vertical roll wheel pulverizer using strain gauges bonded to tension rods in an ambient environment outside the hostile environment of the milling area of the pulverizer. Signals from the strain gauges reflecting strain on the tension rods are converted to a displacement of the wheels inside the pulverizer, and thus a coal bed height.

Abstract: A vertical roller mill, comprising a pulverization table (3) which is accommodated in a housing (2), and rotated and driven by a table driving apparatus, two or more pulverization rollers (4) which are pressed against the upper side of the pulverization table and pulverized massive lumps and two or more roller pressure units (5) which press the pulverization rollers, wherein each of the roller pressure unit comprises a hydraulic cylinder (13) which applies the pressing force to the pulverization roller and a hydraulic circuit connected to the hydraulic cylinder, wherein an accumulator communicates with a pressure oil supply path of the hydraulic circuit, a first on-off valve is provided at the downstream side of a communicating position of the accumulator in the pressure oil supply path, a first bypass path which communicates with the downstream side of the communicating position of the accumulator in the pressure oil supply path and communicates with the downstream side of the on-off valve, and bypasses the

Abstract: A roller mill, particularly an air swept roller mill of the LOESCHE type. The roller mill is preferably provided for the comminution of cement clinker or granulated blast furnace slag and comprises on a grinding track of a rotating grinding pan stationary, rotating grinding rollers and between the grinding rollers stationary, rotatable preparation rollers which compress and remove air from the grinding bed. In order to increase the efficiency of the grinding process and at the same time to reduce the energy requirement the position of the preparation rollers is changed in such a way that the grinding material fed spirally to the grinding rollers is completely rolled over and compressed by the previously arranged preparation rollers. The preparation rollers are, seen in a top view of the grinding pan, positioned radially in the direction of the grinding pan center and roll with their running surfaces on a smaller running ring than the associated grinding rollers.

Abstract: A roller mill includes a mill housing which defines a grinding chamber, a grinding table which can rotate in the grinding chamber and at least one rotatable grinding roller which is in rolling engagement with the grinding table. A drive which is associated with the grinding roller and which has at least one gearing mechanism is further provided, at least a portion of the gearing mechanism being arranged in the grinding chamber in the region of the grinding roller and being in the form of an epicyclic gear system.

Abstract: The invention relates to a roller mill having a grinding table, at least one grinding roller and at least two drives with a rotor winding for driving the roller mill and at least one adjustment device for adjusting the motor torque of at least one drive, the adjustment device being connected to the rotor winding of at least one drive in order to influence the rotor current.

Abstract: A roller mill includes a rotatable grinding table, at least one grinding roller retained rotatably on a pivot lever and in rolling engagement with the grinding table, the pivot lever being pivotable about a pivot lever axis, and at least one drive train connected to the grinding roller and having a fixed motor and a fixed gearing mechanism. The drive train further has a gearing mechanism which pivots with the pivot lever and/or the grinding roller.

Abstract: A roller mill structure which achieves uniform distribution of fine particles passed through a rotary classifier to fine particle exits disposed at four points when conveying as pulverized coal milled in the roller mill on the air current is provided. A roller mill structure is configured to discharge pulverized coal obtained by milling a raw coal, which is loaded in a mill body (11), from fine particle exits (14) formed on the top of the mill body so as to be quartered in the circumferential direction to the outside by air current conveyance.

Abstract: The roller mill according to the invention substantially comprises at least one grinding roller and a grinding table, the grinding table having a grinding table inner space which is open in a downward direction, at least one grinding roller drive system for driving the grinding roller and a grinding table drive system for driving the grinding table. The grinding table drive system further has a gearless direct drive which is arranged in the grinding table inner space.

Abstract: A pulverizer 10 includes a journal assembly 19 with a grinding roller 18 that grinds solids in a grinding table 14. The oscillations of the journal assembly 19 are monitored by an angular displacement transducer (ADT) 32 that creates a composite signal. A controller 83 receives the composite signal from the ADT and compares it with known information of the pulverizer 10. It then identifies abnormal situations such as damage to a grinding roll 14, the grinding table 14, the spring assembly 20 and other parts of the pulverizer 10 before they cause major damage.

Abstract: In a vertical mill, a pulverization table is supported with a vertical rotation axis core in a housing so as to be capable of being driven and rotated, and a pulverization roller rotatable in conjunction with rotation of the pulverization table is disposed above the pulverization table so as to be opposed to the pulverization table, and a roller swing mechanism is provided so as to make the pulverization roller parallel to a surface of the pulverization table and swingable in a direction different from a direction of rotation of the pulverization table. Accordingly, a solid matter such as biomass can be efficiently pulverized, thereby achieving improvement in pulverization efficiency.

Abstract: In a vertical mill, a pulverization table is supported with a vertical rotation axis core in a housing so as to be capable of being driven and rotated, and a pulverization roller rotatable in conjunction with rotation of the pulverization table is disposed above the pulverization table so as to be opposed to the pulverization table, and a cutter roller rotatable in conjunction with rotation of the pulverization table is disposed above the pulverization table so as to be opposed to the pulverization table. Accordingly, a solid matter such as biomass can be efficiently pulverized, thereby achieving improvement in pulverization efficiency.

Abstract: Load cells are placed in the pre-compression systems of spring suspended rollers in coal/ore crusher/classifiers to produce electrical signals representing actual forces generated in the suspension system during crusher operation. This permits forces to be closely monitored during operation and/or automatically adjusted. Alternatively or in addition, alarm signals can be generated when pressures go out of tolerance.

Abstract: A roller mill includes a substantially horizontal grinding table, at least one roller operating interactively therewith which is configured for rotation about its centerline by means of a roller bearing and being connected to a roller shaft. The roller mill also includes a force device for at least partial absorption of an axial force originating at least from the roller and acting in the longitudinal direction of the roller shaft. The force device comprises a first part mounted on a machine component which is stationary relative to the longitudinal direction of the roller shaft and a second part mounted on a machine component rotating about the centerline of the roller and co-rotating therewith. The first and second parts comprise opposing pressure surfaces which both extend substantially perpendicular to the longitudinal direction of the roller shaft and form between them a compartment.

Abstract: The invention relates to a force transfer system comprising a hydraulic cylinder (1) comprising a piston (10) which can be impinged with hydraulic fluid and a thrust bearing (2) which is in operative contact with the piston, said bearing comprising a first and a second glide surface for exerting a sliding motion. The thrust bearing comprises a pressure space (25) which is connected to the side of the piston (10) impinged with hydraulic fluid by way of at least one hole (11) made in the piston.

Abstract: A roller grinding mill is provided that includes a grinding plate, grinding rollers, and at least two drives acting upon the grinding plate, and to a method for operating such a roller grinding mill. At least one grinding roller and substantially simultaneously at least one matching drive can be disengaged during operation. Thus only small radial forces are created that effect the radial bearing of the grinding plate.

Abstract: A grinding device of vertical grinder, comprising a driving device (1); a vertical grinding barrel (2) which is driven by the driving device; a grinding roller (3); and a pressure applying device (4) acting on the grinding roller (3); a running-in surface is composed of the roller surface of the grinding roller and the grinding surface (6) of the inner lining of the vertical grinding barrel, and the angular separation between the grinding surface (6) of the inner lining of the vertical grinding barrel and the vertical line is 40 degrees to ?5 degrees. The device is also provided with a material-shaving device (9).

Abstract: A roller mill (1) for grinding particulate material such as cement raw materials, cement clinker, coal 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) rotatable about respective roller axes and being connected via a roller bearing (16) and a roller shaft (6) to the vertical shaft (5), and said set of rollers (4) being configured for interactive operation with the grinding table (3) for application of pressure to the particulate material; characterized in that each roller bearing (16) across its entire axial extent is axially located radially towards the vertical shaft (5) inwardly of the location of the resulting force from the grinding zone imposed upon the respective roller, in use.

Abstract: The invention provides a method of improving an existing pulverizer mill by provision of an improved port ring located around the circumference of a grinding ring of the mill for common rotation therewith. The conventional port ring has openings separated by thin vanes. The improved port ring has wider openings now separated by lands. The wider openings can pass more unground materials back through the port ring as rejected material but the overall air mass flow can be kept unchanged.

Abstract: A pulverizer 60 includes a spring assembly 10 that urges a grinding roller 72 of a journal assembly 68 onto a grinding surface 66 of a grinding table 64. The force applied is monitored by a load cell 32 located within spring assembly 10 that creates an electronic signal. A controller 83 receives the electronic signal and stores and/or displays it and alternatively acts to adjust the applied force to a desired value. Alternatively, adjustable forces or mechanical dampening may be applied to journal assembly 68 by controller 83. Alternatively, additional sensors may measure displacement of the journal assembly and rotation of the grinding table for other calculations.

Abstract: A roller mill for grinding particulate material such as cement raw materials, cement clinker and the like includes a grinding table and a set of rollers rotatable about a vertical shaft. The set of rollers include a number of rollers rotating about separate roller shafts, which are connected to the vertical shaft. A nozzle ring for directing gases into the roller mill is also included. The nozzle ring encloses the grinding table. Means for regulating the gas flow through the nozzle ring is also provided. At least some of the regulation means are arranged to rotate together with the rollers. Preferably, the position of at least some of the regulation means for regulating gas flow through the nozzle ring relative to the rollers may remain the same so that the gases introduced into the mill via the nozzle ring may exhibit the same flow pattern in relation to the rollers.

Abstract: A method of extending the life of a journal bearing assembly in a solid fuel pulverizer includes: removing a first lower journal bearing from a journal shaft and a lower bearing seat of a lower bearing housing; removing a first upper journal bearing from the shaft and an upper bearing seat of an upper bearing housing; modifying the lower and upper bearing seats; modifying lower and upper shoulders on the journal shaft; disposing the second lower and upper journal bearings on the modified lower and upper bearing seats; disposing a new journal bearing spacer between the second lower and upper journal bearings; disposing a new journal bearing collar between the upper shoulder and the second upper journal bearing; filling a cavity defined by the lower and upper journal housings with grease; and disposing a seal assembly between the shaft and one end of the upper journal housing opposite the lower journal housing to prevent the ingress of solid fuel into the cavity of the journal assembly.

Abstract: The invention relates to a roller mill having a mill housing, a mill path which is supported so as to be rotatable about a mill axis inside the mill housing, and at least one mill roller which can be rotated about a mill roller shaft and which is engaged with the mill path in terms of rolling action. There is further provided a pivot lever which is for rotatably retaining the mill roller and which has a pivot shaft arranged parallel with the mill roller axis and which is supported outside the mill housing. The pivot lever is further in operational contact with a hydropneumatic resilient system in order to adjust the pressing pressure of the mill roller. The pivot lever is supported outside the mill housing with spacing therefrom in such a manner that the forces which are produced by the hydropneumatic resilient system are dissipated into the mill foundation directly or via pillars.

Abstract: An improved deflector structure for an updraft classifier mill for coal and ore is described. The improved deflector structure has an impingement surface which is characterized by a pattern of surface irregularities, either raised geometric figures or recesses of varying sizes and shapes to create turbulence in the air emerging from a rotating vane structure and impinging the deflector as it travels upwardly through the mill housing.

Abstract: Described is a roller mill (1) for grinding particulate material, such as cement raw materials, cement clinker and similar materials, said roller mill comprising a substantially horizontal grinding table (3), at least one therewith interactively operating roller (4) which is configured for rotation about a roller shaft (6) through the use of a bearing (7) for the roller, and a closed circulation system for lubricant for lubricating the bearing (7) for the roller, said circulation system comprising a reservoir (9), ducts (10) for feeding of lubricant to the bearing (7) for the roller and ducts (11) for recirculating the lubricant from the bearing (7) for the roller. The roller mill further comprises an autogenously regulated pressure pump means (20) which is driven by the rotation of the roller (4), and has a first part (21) which is mounted on the roller shaft (6) and a second part (22) which is mounted on the roller (4) and rotates therewith.

Abstract: The invention relates to a roll mill having a grinding plate and at least one grinding roll rolling on the grinding plate, wherein material which is to be comminuted, after being subjected to loading in a gap formed between the grinding plate and grinding roll, is directed away over the periphery of the grinding plate and, furthermore, a stationary accumulating edge, which does not rotate along with the grinding plate, is provided, at least on that side of the grinding roll which is directed towards the periphery of the grinding plate, this accumulating edge forming at least part of an elevation of the periphery of the grinding plate. The elevation of the periphery of the grinding plate here is higher in the region of the grinding rolls than in the region between the grinding rolls, in order to prevent the material which is to be comminuted from escaping radially from the gap formed between the grinding plate and grinding roll.

Abstract: The invention provides a biomass mill, comprising a rotatable pulverizing table 5, a recessed groove 6 which is provided in form of ring on an upper surface of the pulverizing table and has an arcuate cross-section, a pressure roller 9 pressed into the recessed groove, a blowout hole 16 for blowing out the air from around the pulverizing table, and a chute 18 for supplying a wooden biomass toward a center of the pulverizing table, wherein the wooden biomass is supplied via the chute, the wooden biomass is pulverized between the pulverizing table and the pressure roller, and the pulverized wooden biomass is carried by blowing the air through the blowout hole, wherein a surface from an outer peripheral of the recessed groove to the blowout hole is flat surface.

Abstract: A plunger can for a roller assembly within a pulverizing mill has a body which contains a compression spring. A stub shaft transfers the force generated by the compression spring to the roller assembly. A bushing in cooperation with a locking guide in the fore end of the plunger can, along with the stub shaft in an aft end of the plunger can, contains the compression spring there between. The locking guide has an annular flange that fits within an annular channel within the plunger can body. A plurality of extensions spaced around an outside perimeter of the annular flange cooperates with a plurality of extensions around an inside perimeter of the plunger can body such that both sets of extensions clear each other when the locking guide is inserted into the plunger can body. When rotated, the sets of extensions are aligned with each, forming a mechanical lock.

Abstract: In order to minimize the loss of production of a crushing plant, particularly a cement crushing plant and optimize on the gear side the availability of the roller mill, according to the invention a replacement gear is provided alongside the operating mill gear. The mill gear and replacement gear are located on at least one base plate and preferably together with a drive motor for the mill gear and a second motor for the replacement gear, as well as with a lubricating system located between the mill gear and the replacement gear, are preassembled on the base plate. The base plate is horizontally adjustably guided on the mill foundation. If the mill gear fails the base plate with the units mounted thereon can be adjusted in such a way that the replacement gear is positioned below the crushing pan in the place of the mill gear.

Abstract: An electronically controlled journal loading system 20 for controlling and adjusting the amplitude of the load applied to a journal assembly 19 of a pulverizing mill 10. The journal loading system 20 includes a servomotor 44, resolver 134, vertical gearbox 42, coil spring assembly 40, controller 46 and a user interface 48. The journal loading system 20 provides electronic control and adjustment of the force applied to the journal assembly 19 to thereby increase or decrease the load that a grinding roll 18 imposes on the material being pulverized. In the mode of operation of the servo journal loading system 20, a desired load set point is selected via the user/operator interface 48. The servomotor 44 rotates a preload stud (or servo screw) 50 within the coiled spring assembly 40 in the appropriate direction via the gearbox 42. As the preload stud 50 turns, a bronze nut 100 and bushing 94 move axially along the stud to compress or decompress the spring 86.

Abstract: A bowl mill for a coal pulverizer with an air mill for primary entry of air, comprising a substantially closed separator body (2) having a central axis; and a bowl-like grinding table (3) mounted on a shaft (4) rotatable about said central axis, cooperating with a plurality of grinding rolls (6). The airmill is provided with multiple entry openings (17?, 17?; 18?, 18?; 21, 25) on the outer wall of the air mill for multiple entry of hot primary air from the inlets, resulting in better uniformity in air flow around the air mil section and for minimizing formation of eddies and vortices. As a variation of the multiple entry double entry openings can be arranged for entry of hot primary air.

Abstract: The invention relates to a method and a device for grinding hot, wet raw material. The invention is particularly suitable for the cement industry and the grinding and simultaneous drying of cement clinker, slag and aggregates. In order to achieve a throughput increase and energy saving, as well as an improvement in the product quality, particularly with mixed cements, there is a simultaneous grinding and drying through a controlled supply of a cooling gas in the upper mill part with a relatively high hot gas inlet temperature in the lower mill part. The cooling gas supplies ensures a predetermined gas-product temperature downstream of the classifier and replaces or significantly reduces the disadvantageous cooling water injection.

Abstract: The invention relates to a roller mill for grinding solid material such as cement raw materials and similar materials, said roller mill comprising a substantially horizontal grinding table and at least two rollers which are configured for interactive operation with said grinding table, wherein at least one of said rollers rotates about a stationary shaft connected to a rocker arm pivotally connected to a mill stand which substantially is situated outside said grinding table and therefore does not utilize a mill stand and the remaining rollers do not utilize a mill stand. According to the invention the number of rollers, and thereby the capacity of the mill is increased without introducing more mill stands.

Abstract: An electronically controlled journal loading system 20 for controlling and adjusting the amplitude of the load applied to a journal assembly 19 of a pulverizing mill 10. The journal loading system 20 includes a servomotor 44, resolver 134, vertical gearbox 42, coil spring assembly 40, controller 46 and a user interface 48. The journal loading system 20 provides electronic control and adjustment of the force applied to the journal assembly 19 to thereby increase or decrease the load that a grinding roll 18 imposes on the material being pulverized. In the mode of operation of the servo journal loading system 20, a desired load set point is selected via the user/operator interface 48. The servomotor 44 rotates a preload stud (or servo screw) 50 within the coiled spring assembly 40 in the appropriate direction via the gearbox 42. As the preload stud 50 turns, a bronze nut 100 and bushing 94 move axially along the stud to compress or decompress the spring 86.

Abstract: The invention relates to a roller mill having a modular construction. In order to permit an increased rated grinding capacity with a limited roller/rocking lever mass and a larger number of rollers, the standards are displaced outwards and the rocking lever axes, relative to the displaced standards, are positioned eccentrically and radially inwards between the grinding table and standards.

Abstract: A coil spring assembly for connection with a separator body to apply a spring force to a grinding roll of a journal assembly to pulverize solid fuel. The coil spring assembly includes: a preload stud having a first end in communication with the journal assembly and an exposed opposite second end extending from the coil spring assembly; a spring adjustment bolt and bearing assembly being fixed relative to the preload stud extending therethrough; and a seal being substantially cylindrical shaped and flexible at least along a central axis thereof.

Abstract: A cutting ring element for a centrifugal pump of the chopper type comprises a ring-like structure having at least one cutting member positioned along the ring-like structure and extending outwardly therefrom. The cutting ring element is structured to be positioned adjacent the drive side of an impeller having cutting structures associated with the drive side of the impeller which interact with the cutting ring element to chop and reduce the size of entrained solids in a pumped fluid, or slurry, to prevent such solids from infiltrating behind the impeller.

Abstract: The invention relates to a roll mill having a grinding plate and at least one grinding roll rolling on the grinding plate, wherein material which is to be comminuted, after being subjected to loading in a gap formed between the grinding plate and grinding roll, is directed away over the periphery of the grinding plate and, furthermore, a stationary accumulating edge, which does not rotate along with the grinding plate, is provided, at least on that side of the grinding roll which is directed towards the periphery of the grinding plate, this accumulating edge forming at least part of an elevation of the periphery of the grinding plate. The elevation of the periphery of the grinding plate here is higher in the region of the grinding rolls than in the region between the grinding rolls, in order to prevent the material which is to be comminuted from escaping radially from the gap formed between the grinding plate and grinding roll.

Abstract: A main shaft and method for installing a main shaft for a pulverizer are provided herein. The main shaft includes at least a first tapered portion for accepting a yoke and a first associated threaded portion for securing the yoke to the main shaft. Also included is a second tapered portion for accepting a bevel gear assembly and a second associated threaded portion for securing the bevel gear assembly to the main shaft.

Abstract: A coil spring assembly for connection with a separator body to apply a spring force to a grinding roll of a journal assembly to pulverize solid fuel. The coil spring assembly includes: a preload stud having a first end in communication with the journal assembly and an exposed opposite second end extending from the coil spring assembly; a spring adjustment bolt and bearing assembly being fixed relative to the preload stud extending therethrough; and a seal being substantially cylindrical shaped and flexible at least along a central axis thereof.

Abstract: A plunger can for a roller assembly within a pulverizing mill has a body which contains a compression spring. A stub shaft transfers the force generated by the compression spring to the roller assembly. A bushing in cooperation with a locking guide in the fore end of the plunger can, along with the stub shaft in an aft end of the plunger can, contains the compression spring there between. The locking guide has an annular flange that fits within an annular channel within the plunger can body. A plurality of extensions spaced around an outside perimeter of the annular flange cooperates with a plurality of extensions around an inside perimeter of the plunger can body such that both sets of extensions clear each other when the locking guide is inserted into the plunger can body. When rotated, the sets of extensions are aligned with each, forming a mechanical lock.

Abstract: A primary classifier (300) particularly suited for use in a bowl mill (10) of the type that is employed for purposes of effecting the pulverization of materials such as coal is provided by the present invention. The primary classifier (300) includes a vane wheel portion (360) affixed to the periphery of the rotatable grinding surface (14) of the bowl mill (10) so as to extend circumferentially around the entire interior of the substantially closed separator body (12) of the bowl mill (10). The primary classifier (300) further includes a low profile deflector portion (380) mounted within the interior of the substantially closed separator body (12) of the bowl mill (10) in closely spaced relation to the circumference of the rotatable grinding surface (14) at an elevation below the elevation of the grinding journal openings (205) and so as to extend continuously without interruption about the entire interior of the substantially closed separator body (12) of the bowl mill (10).

Abstract: A high efficiency bowl mill (100) is provided by the present invention. Included in the high efficiency bowl mill (100) is a plow (185) that is downstream of a grinding roll (180) on a grinding surface (145). The plow (185) loosens material that has been compacted by the grinding roll (180). Also included is a deflector (165) that redirects an air stream so as to pick up material loosened by the plow (185) and deposit material requiring further grinding. An outlet (201) of an inverted cone (200) is positioned so as to deposit material for pulverization on the grinding surface (145) and to restrict the air stream from entering the inverted cone (200).

Abstract: A bowl mill for a coal pulverizer with an air mill for primary entry of air, comprising a substantially closed separator body (2) having a central axis; and a bowl-like grinding table (3) mounted on a shaft (4) rotatable about said central axis, cooperating with a plurality of grinding rolls (6). The airmill is provided with multiple entry openings (17?, 17?; 18?, 18?; 21, 25) on the outer wall of the air mill for multiple entry of hot primary air from the inlets, resulting in better uniformity in air flow around the air mill section and for minimizing formation of eddies and vortices As a variation of the multiple entry double entry openings can be arranged for entry of hot primary air.

Abstract: A system for use with a roll bowl type mill for the pulverizing of solid fuels such as coal. The system includes hardware in the form of sensors and other components and software to among other things monitor the operating condition of the mill's moving parts and predict their failure. The system can determine the diameter of the mill's rollers, or the reduction and/or depth of cup wear of each of the rollers, the thickness of the solid fuel in the mill, can by analysis determine the wear of each of the one or more roller bearings in the mill and predict their failure and can estimate the mill availability.

Abstract: An accumulator assembly comprising at least two accumulators that are hydraulically interconnected to the same source of hydraulic fluid. Each accumulator containing an energy absorbing medium which is compressible when a movable barrier which separates the hydraulic fluid from the energy absorbing medium is acted upon by an increase in pressure of the hydraulic fluid. When the assembly contains two accumulators, one accumulator contains a compressibility limiter which interrupts the compressibility of the energy absorbing medium within the accumulator and the other accumulators does not contain a compressibility limiter so that the energy absorbing media therein may be fully compressed by the hydraulic fluid. The accumulator assembly is favorably utilized in a vertical roller mill.