Double Roller Crusher When it works, the raw material is fed in and fall into the V type crushing cavity between the two crushing rollers and crushed into qualified sizes by the extruding and cutting force of the two counter-rotating rollers, and then discharged from the outlet.
Back — The roof or upper part in any underground mining cavity. Backfill — Mine waste or rock used to support the roof after coal removal. Barren — Said of rock or vein material containing no minerals of value, and of strata without coal, or containing coal in seams too thin to be workable.
A. Abutment - In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back ...
Williams manufactures a large variety of hammer mills and hammer crushers to handle virtually any size reduction job. Our rugged hammer mills provide the efficiencies and economies of midair, impact crushing, grinding or shredding of diverse range of materials.
Crushing rolls might, logically, include roll crushers of the sledging type, the name, by popular usage, is restricted to the double-roll machine (with either smooth or corrugated shells) which crushes entirely by pressure between the surfaces of the roll faces.
Rolling mill Rolls and Roll Shop . Rolls are the main and very costly consumables in a rolling mill. They are used to roll steel in the rolling mill and their performance depend on many factors which include the materials used and the loads to which they are subjected to during service.
ABOUT THE AUTHOR The Dutch Windmill, author Frederick Stokhuyzen (1891-1976), former chairman of 'De Hollandsche Molen', Association for the Preservation of Windmills in the Netherlands, publisher CAJ van Dishoek-Bussum-Holland, 1962, original title 'Molens', translated from the Dutch by Carry Dikshoorn with the financial aid of the Prins ...