Abstract: A grinding mill apparatus is disclosed comprising a grinding mill having a feed end head and a discharge end head and a shell disposed between said heads and secured thereto for rotation with the head. A feed end bearing and a discharge end bearing are provided for supporting the feed end head and the discharge end head for rotation about a generally horizontal axis. The bearings include a bearing element which pivots with the heads with the amount of pivot proportional to the increase or decrease of charge level within the mill. A proximity probe is secured to a stationary surface and aligned with a target which is secured to the bearing. The proximity probe detects changes in gap size between the probe and the target and generates a signal indicating an increase in charge level or a decrease in charge level within the mill.

Abstract: An apparatus for controlling a hydraulic turbine is disclosed comprising a hydraulic circuit to control the positioning of turbine runner blades and a hydraulic circuit to control the positioning of turbine wicket gates. The runner blade hydraulic circuit comprises a solenoid valve for normal operation of the blades and a slow rate servovalve for moving the blades when the actual blade position differs from a desired position by less than a predetermined tolerance. The wicket gate circuit comprises a solenoid valve for normal control of the gates. A diverter directs flow from the solenoid valve to a flow rate control valve when the difference between the actual and desired position of the gates is less than a second predetermined tolerance.

Abstract: An adjustable draft tube is disclosed for a hydraulic turbine installation. The draft tube includes a pair of fabricated box piers which are positioned in a tailwater with the turbine outlet disposed between the piers. The piers are anchored to a tailwater floor and a powerhouse foundation wall. A roof is provided extending between opposing surfaces of the piers with an edge of the roof pivotally secured to the piers above the turbine outlet. The roof is pivotable between a first position with a downstream edge of the roof disposed beneath a predetermined low tailwater elevation and a second position with the downstream edge disposed between the low tailwater elevation and a predetermined high tailwater elevation.

Abstract: A hydraulic manifold is provided on a primary mast section which maximizes the commonalty of hydraulic components used in the hydraulic lift control systems of two and three stage mast assemblies used in lift trucks. Two and three stage mast assemblies are illustrated using primary mast sections which are identical and using secondary mast sections which are nearly the same.

Abstract: This invention relates to a vehicle-mounted closed circuit portable crushing and screening plant in which a plurality of units for processing material to be crushed, such as a grizzly, a primary crusher, and a secondary crusher are mounted to discharge their outputs onto the horizontal feeder portion of a dual belt conveyor-elevator having an elevator portion which receives the deposited material from the horizontal feeder portion and elevates such material to and discharges such material into the upper feed end of a vibrating screen device mounted on the vehicle. The vibrating screen device classifies the material deposited thereon for recirculation to the secondary crusher and/or for discharge as a plurality of end products of predetermined size classifications. The vibrating screen device and the dual belt conveyor-elevator are both foldable from an elevated operating position to a retracted transport or storage position.

Abstract: The carriage lift and mast lift cylinders are sequentially extended and retracted in the reverse order of pressure required to actuate them by a sequencing valve to insure proper sequential movement of the lift carriage and extension of the mast sections.

Abstract: An overhead guard is provided for counterweighted lift trucks of different lengths. The overhead guard has a top portion supported at its front end by a pair of laterally spaced front legs extending downwardly to attaching points on the front of the truck and the top portion is supported at its rear end by adjustably positioned laterally spaced rear posts. The top of the rear posts may be attached to different longitudinally spaced points on the upper portion of the guard and the bottom of the rear posts are attachable to support posts on the counterweight which is at different longitudinal positions on different length trucks.

Abstract: A pump is disclosed having a damped dynamic vibration absorber for attenuating pump vibration in response to a periodic disturbing force generated when the pump is in operation. The vibration absorber comprises elastic means, an annular mass and an energy dissipative means. The elastic means are arranged around the pump in a plane generally normal to the axis of rotation having one end secured to the pump and one end free to vibrate relative to the pump. The annular mass is secured to the free end and the energy dissipative means comprising a squeeze film damper is secured to the annular mass. The annular mass has a predetermined mass, and the elastic means have a predetermined stiffness and the squeeze film damper has a predetermined damping ratio such that the absorber generates a compensating force acting on the pump out of phase with a periodic disturbing force which acts on the pump and is generated while the pump is operated.

Abstract: A warehouse system employs a crane guided for movement along an aisle with storage racks on opposite sides thereof and mounting a carriage for vertical reciprocation thereon. An extractor supported on the carriage has a pair of narrow extensible arms which engage the undersides of lips formed on opposite sides of a tote pan. The extensible arms each include three rails nested in one-above-the-other relation with the intermediate rail having vertical load bearing rollers engaging the upper and lower rails. A harmonic drive causes extension and retraction of the extractor arms through a chain and pulley arrangement. The tote pans are nestable and have ribbed bottoms cooperatively engaging cantilevered brackets on the storage racks whereby the pans are releasably detained in their stored position in the warehouse.

Abstract: A method for manufacturing stay rings for a family of hydraulic turbine installations is disclosed. The stay ring comprises a plurality of stay vanes axially extending between two concentric ring members. Stay vanes are formed from flat plates and aligned circumferentially on the rings with radially outer leading edges presenting an intake angle acceptable for any turbine installation within a predetermined family of turbine installations. The vanes are sized such that their length measured from the leading edge to a trailing edge is such that the vane presents a discharge angle equal to a predetermined minimum discharge angle for the family of turbine installations for a given turbine installation. A desired discharge angle corresponding with a desired power output is predetermined and the trailing edges of the stay vanes are trimmed an amount sufficient for the stay vanes to present the desired discharge angle.

Abstract: This invention relates to a method in the operation of magnetic separators comprising a plurality of canisters or like devices (4) containing magnetizable induction poles (41) arranged to pass through a magnetic field (1). While the canisters (4) are located in the magnetic field (1), a particle suspension is supplied (5) to the canisters, in which magnetizable particles are attracted to the induction poles (41). Rinsing fluid (6) may optionally be supplied to the canisters while the canisters are still located within the magnetic field (1), thereby to remove non-magnetic particles through discharge means (7a, 7b) for fluid and non-magnetic material. Outside the magnetic field flushing fluid is supplied in a flushing station (8, 56), this flushing fluid removing magnetic material through discharge means (8, 57) for magnetic material. The canisters (4) are provided with flexible sealing lips (36) as disclosed in U.S. Pat. No.

Abstract: A self-flushing, magnetic separator technique including feeding the medium to be separated to one end of a matrix in a container; collecting separated fluid from the other end of the matrix; accumulating at least one matrix volume of the separated fluid in a chamber in the container adjacent one of the ends of the matrix stopping flow to and from the matrix, trapping the accumulated fluid in the chamber; and in one embodiment introducing a pressurized drive fluid to the chamber and venting the other end of the matrix to urge the accumulated fluid to move through and flush the matrix.

Abstract: A process is disclosed for gasifying solid coal particles in a rotary kiln that produces simultaneously and continuously two distinctly different fuel gas streams from the opposite ends of a single kiln. A relatively low temperature gas is discharged from the solids inlet end of the kiln, which contains substantially all tars produced by the process. A second of the gas streams is discharged from the solids discharge end of the kiln at approximately 1,900.degree. F. and substantially tar-free. Heat is recovered from this tar-free gas after only a simple cleaning of particulate matter, as may be provided by a cyclone separator.

Abstract: Coal is placed upon hot mineral solids being cooled by an upward flow of ambient air; the coal is dried, ignited and completely combusted under process conditions associated with cooling after firing. The hot off-gas from cooling is returned directly to the firing section or other sections of the process as heat.

Abstract: A roller conveyor or conveyor-classifier assembly is disclosed which comprises a plurality of rollers (16), a corresponding bearing support block (18) for each end of each of the rollers (16), with each block (18) being of upper case "H" configuration in transverse cross section to define an upper and lower groove (18U and 18L in FIG. 6), and including frame (25) for supporting the blocks (18). The frame assembly (25) comprises oppositely disposed rails (22A, 24A) each having a track (22B, 24B), respectively, adapted to slidably project into oppositely disposed grooves (18U, 18L) in bearing support blocks (18).

Abstract: A method for operating a crushing and grinding facility is disclosed in which crushing of mine-run material is controlled to always match grinding feed requirements while both crusher(s) (10) and grinding mills (16) operate full time and draw full power during the hours of what may be unequal length working days. The grinding mill (16) is also operated to produce the maximum output of final product that is within its existing capabilities. At each of a succession of measurement times (e.g., every 1/2 hour during a 22-hour working day of the mill), the rate of production of final product by the grinding mill (6) is ascertained (as by 21, 22, 23) and projected to the end of the mill working day.

Abstract: A seal for use in sealing an annular opening between a stationary member and a rotating cylinder telescopically arranged in the stationary member, the seal comprising an annular ring member circumscribing the cylinder adjacent the stationary member and closing the annular opening. The seal comprises weighting means extending axially away from a back side of the ring member to provide a counterweighting effect which causes a tilting of the ring member, whereby said tilting and the rotation of the cylinder moves the ring member into engagement with the stationary member to substantially seal the annular opening, all in accordance with the teaching of U.S. Pat. No. 3,042,389. In accordance with the present invention, means forming part of the seal is provided for adjusting the internal diameter of the annular ring member to compensate for manufacturing tolerances in the annular ring member and/or dimensional tolerances in the outer diameter of the rotating cylinder.

Abstract: Emission gas to be scrubbed of sulfur dioxide or the like has turbulent lengthwise flow through an elongated mixing vessel. At a mixing zone in the vessel, near where said gas enters it, finely comminuted lime (Blaine Number preferably 6000 before calcining) is fed into the gas and carried out of the vessel with the gas to a cyclone separator. From the cyclone the gas passes to a baghouse at which residual lime is removed from it and it is released. A minor portion of the lime separated at the cyclone is sent to waste; most is returned to the mixing zone for recycling. Make-up lime is fed to the mixing zone from a suspension calcining furnace, reaching the mixing zone while still heated. To maintain 650.degree. C. to 750.degree. C. at the mixing zone, recycled lime may be reheated in passing from the cyclone to that zone.

Abstract: A suspension preheater adapted to be connected to the feed end housing of a rotary kiln or the like, whereby kiln exhaust gas emerging from the feed end housing passes through the preheater in countercurrent heat exchange relation with particulate feed material for the kiln which passes through the preheater from a feed inlet end contiguous the upper end of the preheater to a feed discharge end at the lower end of the preheater, comprising one or more cyclone means arranged in series gas and particulate feed material flow relation with respect to each other, means for admitting the particulate feed material from a feed material supply source to the upper portion of the preheater, a hollow preheating chamber at the lower portion of the suspension preheater, the hollow preheating chamber having the upper end thereof in gas and material flow communication with the upper end of the lowermost of the cyclone means, the lower end of the hollow preheating chamber being in gaseous flow communication with the feed end

Abstract: A grinding system and method for grinding mineral ore which is adapted for use where ore is required to be fed for grinding from a supply source at a substantially constant rate of feed, and in which the grinding characteristics of the ore and the power required to grind a predetermined weight of the ore vary unpredictably during the grinding operation, comprising a primary semi-autogenous grinding mill and a primary fully autogenous grinding mill connected in parallel relation with each other to the ore supply source, first drive means for driving the semi-autogenous grinding mill, power sensing means for measuring the input power required to drive the semi-autogenous grinding mill, and means for varying the ore feed rate to the semi-autogenous grinding mill whereby to maintain the input power to the semi-autogenous grinding mill at a substantially constant value or set point.