- 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 ...
A system in which the operation of the winder is similar to automatic cyclic winding, but the starting is instigated by the onsetter and banksman. When everything is ready for winding, the onsetter and banksman press their respective start pushbuttons and the winder starts, accelerates, and banks automatically without the intervention of the winding engineman. With this form of control, loading and discharging of the skips is fully automatic.
Industry:Mining
A system in which the pressure-generating source is located at the entrance and raises the pressure of the air above atmospheric.
Industry:Mining
A system of automatic winding in which the complete installation operates without human aid and winding continues automatically as long as coal is available at the shaft bottom and is cleared at the bank.
Industry:Mining
A system in which two parallel, grooved sheaves are coupled. These sheaves are driven directly from a hoisting engine. One sheave is set at a slight angle to the vertical so that the rope will pass freely from one sheave to the other. The hoisting rope passes around the drive sheaves and then to a takeup sheave, which is mounted on a horizontally movable carriage to take up slack or to change the hoist from one level to another. A tail rope is used in this system, although it may not be absolutely necessary.
Industry:Mining
A system of access or development openings, generally in bituminous coal mines, involving more than one pair of parallel entries, one for haulage and fresh air intake and the other for return air. Multiple-entry systems permit circulation of large volumes of air.
Industry:Mining
A system of automatic winding in which the complete installation operates without human aid and winding continues automatically as long as coal is available at the shaft bottom and is cleared at the bank.
Industry:Mining
A system of automatic winding in which the complete installation operates without human aid and winding continues automatically as long as coal is available at the shaft bottom and is cleared at the bank.
Industry:Mining
A system to control the speed of a winder consisting of a cam-operated rheostat in parallel with a manually operated winder controller, the instantaneous cam position being directly related to the position of a cage in the shaft. If the driver left the manual control in the full-speed position, the cam control and associated closed-loop control would take charge and automatically decelerate the winder to creep speed as the cage approaches the surface. Should the driver still defer the operation of the lever, the winder would stop on the operation of an overwind limit switch. By the introduction of a small switch to initiate the wind and another to terminate the wind, fully automatic operation is possible.
Industry:Mining
A system of boring using solid or hollow rods or ropes; may be used for exploratory drilling and for blasting purposes.
Industry:Mining
A system of boring, using usually hollow rods, with or without the production of rock cores. Rock penetration is achieved by the rotation of the cutting tool. The method is used extensively in exploration, particularly when cores are required. It is the usual method in oil well boring with holes from 6 to 18 in (15 to 45 cm) in diameter.
Industry:Mining
