- المجال: 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 heavy wall pipe used in lieu of drill rods to conduct water downward inside and to the bottom of a drivepipe being sunk through overburden by a wash-and-drive method.
Industry:Mining
A heavy wall pipe used in lieu of drill rods to conduct water downward inside and to the bottom of a drivepipe being sunk through overburden by a wash-and-drive method.
Industry:Mining
A heavy wheel used in a rotating system to reduce surges of power input or demand by storing and releasing kinetic energy as it changes its rate of rotation.
Industry:Mining
A heavy wooden frame erected at the mouth of a rectangular shaft to provide a solid support for the timber sets. A more permanent structure consists of a concrete wall extending from two to eight sets in depth. On this concrete mass is bolted the bearer timbers that support the top heavy set or collar set. The term also applies to the heavy concrete ring at the mouth of a circular concrete-lined shaft.
Industry:Mining
A heavy wooden frame erected at the mouth of a rectangular shaft to provide a solid support for the timber sets. A more permanent structure consists of a concrete wall extending from two to eight sets in depth. On this concrete mass is bolted the bearer timbers that support the top heavy set or collar set. The term also applies to the heavy concrete ring at the mouth of a circular concrete-lined shaft.
Industry:Mining
A heavy, chain-type flexible conveyor capable of being advanced with the face without dismantling. It is designed either to carry a coal cutter or a cutter loader or to guide and hold a plow against the face. It may be advanced by horizontal hydraulic rams that are fixed at about 20-ft (6-m) intervals on the waste side of the conveyor. It is often employed on prop-free-front faces with hand filling, and it has a capacity of about 200 to 300 st/hr.
Industry:Mining
A heavy, chain-type flexible conveyor capable of being advanced with the face without dismantling. It is designed either to carry a coal cutter or a cutter loader or to guide and hold a plow against the face. It may be advanced by horizontal hydraulic rams that are fixed at about 20-ft (6-m) intervals on the waste side of the conveyor. It is often employed on prop-free-front faces with hand filling, and it has a capacity of about 200 to 300 st/hr.
Industry:Mining
A heavy, chain-type flexible conveyor capable of being advanced with the face without dismantling. It is designed either to carry a coal cutter or a cutter loader or to guide and hold a plow against the face. It may be advanced by horizontal hydraulic rams that are fixed at about 20-ft (6-m) intervals on the waste side of the conveyor. It is often employed on prop-free-front faces with hand filling, and it has a capacity of about 200 to 300 st/hr.
Industry:Mining
A heavy, crawler-tracked, 200-hp (149-kW) cutter loader designed for longwall faces in seams over 4-1/2 ft (1.37 m) thick, and takes a buttock 5 ft (1.52 m) wide. The maximum cutting height is 7-1/2 ft (2.29 m). Dimensions: length 17-3/4 ft (5.41 m), width 4-1/2 ft (1.37 m), and height 3-3/4 ft (1.14 m). The cutterhead consists of seven cutter chains mounted side by side and can be moved up and down radially to cut the coal from roof to floor. It delivers the coal onto the face conveyor by a short cross conveyor. Capacity is 961 more than 400 st (363 t) per machine and more than 4 st (3.63 t) output per worker per shift.
Industry:Mining
