- Industry: 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 cutter loader for continuous mining in longwall faces. Its main cutting unit is the trepanner wheel with cutting arms, one at each end of the machine to enable it to cut in both directions on the face. Also fitted are a vertical, back-shearing jib; a floor-cutting jib, duplicated to enable cutting in either direction; and, if necessary, a roof-cutting disk. The machine is used in conjunction with an armored flexible conveyor on a prop-free front face; suitable for seams between 3 ft and 4 ft (0.9 m and 1.2 m) thick, although it can work in thicker seams if the top coal falls freely.
Industry:Mining
A cutter loader for continuous mining on a longwall face. It consists of two cutting heads fixed at each end of a continuous-track-mounted chassis. The heads are pivoted and controlled hydraulically for vertical movement. Each head comprises two bores and a frame or loop cutter that trims the bottom, face, and top. A cross conveyor delivers the coal to the adjacent face conveyor. The machine cuts a web of 5 ft (1.5 m) in seams from 37-1/2 in (95 cm) to 5 ft high. With an overall length of 18 ft (5.5 m), it weighs 15 st (13.6 t).
Industry:Mining
A cutter loader in which the trepanner head is incorporated into the shearer-loader while the cutting drum is retained to dress the floor and back of the cut.
Industry:Mining
A cutter loader similar to an Anderton shearer except that the drum is replaced by a frame jib 42 in (107 cm) high and 20 in (51 cm) deep. The machine travels on an armored flexible conveyor at a speed of about 4-1/2 ft/min (1.4 m/min). It cuts a 20-in (51-cm) web on the cutting run, and the plow deflector loads the cut coal onto the conveyor. On the reverse run, the deflector loads all the loose coal left on the track, and the conveyor is snaked over behind the machine. The loader is suitable for mediumthickness seams, and the yield of large coal is good.
Industry:Mining
A cutter loader which is essentiaily a conversion unit for Anderton shearer machines and designed to produce a reasonable percentage of large coal. The top and bottom of the seam are cut by rotating drums of small diameter while shearing the back of the cut with a narrow-kerf jib and chain.
Industry:Mining
A cutter loader with a number of horizontal jibs similar to a coal cutter. Loose coal is diverted onto the conveyor by gummer and plow plate. The machine is usually used in seams up to about 3 ft (0.9 m) in thickness with a clean roof parting. The depth of cut varies up to 4 ft (1.2 m). Coal degradation is considerable.
Industry:Mining
A cutter, all of whose flutes twist away in a clockwise direction when viewed from either end.
Industry:Mining
A cutter-loader based on the plow principle and designed to cut coal that is too hard for the ordinary plow. Two vertical blades, fitted one at each end of the machine, carry cutting picks that shear the coal from the face by an oscillating motion. The machine is hauled backward and forward along the face by a chain haulage mounted on the tail end of the conveyor. The conveyor and slicer are held up to the coal by pneumatic rams spaced along the goaf side of the conveyor. The sheared coal is forced from the face by the wedge shape of the machine and is loaded on to the armored conveyor by means of 1547 specially shaped ramps. The machine has been designed for seams with a minimum thickness of 4 ft (1.22 m) and has a maximum cutting depth of 14 in (35.56 cm).
Industry:Mining
A cutter-loader based on the plow principle and designed to cut coal that is too hard for the ordinary plow. Two vertical blades, fitted one at each end of the machine, carry cutting picks that shear the coal from the face by an oscillating motion. The machine is hauled backward and forward along the face by a chain haulage mounted on the tail end of the conveyor. The conveyor and slicer are held up to the coal by pneumatic rams spaced along the goaf side of the conveyor. The sheared coal is forced from the face by the wedge shape of the machine and is loaded on to the armored conveyor by means of 1547 specially shaped ramps. The machine has been designed for seams with a minimum thickness of 4 ft (1.22 m) and has a maximum cutting depth of 14 in (35.56 cm).
Industry:Mining
