Factor of safety — The ratio of the ultimate breaking strength of the material to the force exerted against it.
Resin bolting — A method of permanent roof support in which steel rods are grouted with resin. Competent rock — Rock which, because of its physical and geological characteristics, is capable of sustaining openings without any structural support except pillars and walls left during mining stalls, light props, and roof bolts are not considered structural support.
Indicated coal resources — Coal for which estimates of the rank, quality, and quantity have been computed partly from sample analyses and measurements and partly from reasonable geologic projections.
Beneficiation — The treatment of mined material, making it more concentrated or richer. Haulageway — Any underground entry or passageway that is designed for transport of mined material, personnel, or equipment, usually by the installation of track or belt conveyor.
However, modern instrumentation shows that current velocities in deep water masses can be significant although much less than surface speeds. Coal desulphurisation — Removal of sulphur from coal or coal gas.
Saltier water is denser than fresher water because the dissolved salts fill interstices between water molecules, resulting in more mass per unit volume. Crib — A roof support of prop timbers or ties, laid in alternate cross-layers, log-cabin style.
Layout — The design or pattern of the main roadways and workings. Two conveyor programs are included; one for regular flat or uphill conveyors and the other for downhill regenerative conveyors.
Lift — The amount of coal obtained from a continuous miner in one mining cycle.
Agglomeration — A family of processes which can be used to concentrate valuable minerals including coal based on their adhesive properties. Hydraulic — Of or pertaining to fluids in motion. A gas that may be present in the afterdamp of a gas- or coal-dust explosion, or in the gases given off by a mine fire; also one of the constituents of the gases produced by blasting.
Formation of deep water masses[ edit ] The dense water masses that sink into the deep basins are formed in quite specific areas of the North Atlantic and the Southern Ocean.
The opposite of inby. A Abutment — In coal mining, 1 the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and 2 the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back abutment, that is, the settled packs behind the face.
Job Safety Analysis J. Collar — The term applied to the timbering or concrete around the mouth or top of a shaft. Round — Planned pattern of drill holes fired in sequence in tunneling, shaft sinking, or stoping. One pulley is driven by an electric motor to rotate the belt; the other pulley is connected to two parallel hydraulic cylinders to move back and forth to create tension load cycles in the belt loop.
This research report presents a comprehensive assessment of the market and contains thoughtful insights, facts, historical data and statistically-supported and industry-validated market data and projections with a suitable set of assumptions and methodology. Drill — A machine utilizing rotation, percussion hammeringor a combination of both to make holes.
Our areas of expertise in conveyor belt analysis and testing are listed below.
Working face — Any place in a mine where material is extracted during a mining cycle. Bump or burst — A violent dislocation of the mine workings which is attributed to severe stresses in the rock surrounding the workings.
A blind horizontal opening into a mountain, with only one entrance. The slot allows room for expansion of the broken coal. The drill steel is hollow, and a vacuum is applied at the base, pulling the dust through the steel and into a receptacle on the machine.
Parting — 1 A small joint in coal or rock; 2 a layer of rock in a coal seam; 3 a side track or turnout in a haulage road. Respirable dust sample — A sample collected with an approved coal mine dust sampler unit attached to a miner, or so positioned as to measure the concentration of respirable dust to which the miner is exposed, and operated continuously over an entire work shift of such miner.
A 2-roll "V" configuration is required for conveyors with horizontal curves for proper tracking. Energy mix — The combination of sources used to provide energy at any given time and place. This new conveyor belt will move and position items on the conveyor belt within.
holidaysanantonio.com - Computer Software for Belt Conveyor, Belt Feeder and Pulley Shaft Design. Free demo for engineers, mining, coal, aggregate, gravel, cememt and bulk materials handling designers.
According to CEMA Conveyor Equipment Manufacturers Association. The Tru-Trainer® conveyor belt tracker employs a unique and highly effective tracking action, which is non-damaging to the belt and reacts immediately if the conveyor belt begins to drift off center.
Lagrangian ocean analysis is a powerful way to analyse the output of ocean circulation models. • We present a review of the Kinematic framework, available tools, and applications of Lagrangian ocean analysis.
The article deals with analysis of force conditions in a belt of classic belt conveyor by FEA. Analysis determines rolls contact forces acting on the belt at idler station.
Dynamic analysis is used to verify the maximum and minimum loads on all belt conveyor components during all possible transient conditions of stopping and starting. It is also used to develop and test the control algorithms necessary to safely and reliability stop and start the load.Conveyor belt analysis