- 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 plow designed for use in a seam with sticky coal. It consists essentially of two shortened plow bases connected by a heavy tension spring and carrying two adjustable booms fitted with cutting bits and connected at the apex to a cutterhead, which plows at roof level or at any lower level that will bring down the top coal.
Industry:Mining
A plow developed from the Anbauhobel machine and designed for cutting thin coal seams. The plow drives, instead of being on the face side of the conveyor, are on the waste side and the plow chains run in two tubes along the waste side of the conveyor chutes.
Industry:Mining
A plow developed from the Anbauhobel machine to allow the conversion of a Lobbe Hobel to give the plow an independent drive.
Industry:Mining
A plow type of cutter loader for cutting the harder coal seams. It consists of stepped kerving bits that precut the coal, leaving the unstressed coal to be cut by the following bits. The kerving bits may be either rigid or swiveling.
Industry:Mining
A plow-type cutter loader developed for use in hard coal seams. It has four horizontal stepped precutting blades, which make a precut from 8 to 12 in (20.3 to 30.5 cm), to weaken the coal immediately in front of the machine. It can be single or double ended, and is hauled along the face by winches. The coal is loaded onto a panzer conveyor, which is advanced behind the machine by compressed air rams.
Industry:Mining
A plow-type machine hauled by an endless chain at a speed of 6 ft/s (1.83 m/s). The ram scraper is pressed toward the face by the tension of the return strand, the return sheave being located inby for this purpose.
Industry:Mining
A plow-type machine hauled by an endless chain at a speed of 6 ft/s (1.83 m/s). The ram scraper is pressed toward the face by the tension of the return strand, the return sheave being located inby for this purpose.
Industry:Mining
A plug of iron or wood used instead of tamping material to close up a loaded blasthole.
Industry:Mining
A plug, usually of wood, used by seismic field parties to plug a hole upon completion of shooting. This prevents caving, protects the public from injury, and protects the exploration company from damage claims that might result from open holes.
Industry:Mining
