- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
An appliance for use in conjunction with the Lilly controller for controlling the landing speed of less than 5 ft/s (1.52 m/s) when workers are being transported by winding. On each dial of the Lilly controller, an auxiliary dial is bolted to carry a slow-banking cam engaging near the end of the wind with a roller arm. The action of the appliance depends on the relative rate of movement of this roller and that of the piston in an oil dashpot cylinder.
Industry:Mining
An appliance for washing or sizing very fine particles, based on the principle that large grains settle at a faster rate through a liquid than small grains of the same material. The medium is commonly an upward current of water.
Industry:Mining
An appliance in which the coal or ore is moved through a chamber containing hot gases on a perforated plate or a heavy mesh, stainless-steel continuous belt.
Industry:Mining
An appliance in which the moist coal is fed into a column of upward-flowing hot gases and moisture removal is virtually instantaneous. Suspension dryers were widely used in the United States for drying coals from 1/2 in (1.3 cm) downwards in size.
Industry:Mining
An appliance or piece of equipment capable of retarding or stopping cages in a shaft in an emergency.
Industry:Mining
An appliance that can bring a wagon completely to rest and is usually used near the departure end of mine sidings. It can be rendered inoperative by remote control if required.
Industry:Mining
An appliance that reduces the speed of a wagon traveling in excess of a designed value (e.g., 3-1/2 mph), while having no effect on wagons moving at speeds less than this figure. The appliance is a self-contained hydraulic unit.
Industry:Mining
An appliance that reduces the speed of wagons traveling above the design value, but for wagons traveling at speeds less than this, it releases energy by thrusting against the wheel flanges, therefore speeding up the vehicle.
Industry:Mining
An appliance that releases automatically the winding rope from the cage should an overwind occur.
Industry:Mining
An appliance to collect or precipitate suspended dust. Dust extraction is often necessary at coal-preparation plants, loading stations, and also underground. The appliance may be a cyclone, fabric filter, spray tower, scrubber, or an electrostatic separator.
Industry:Mining
