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A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, sand or rock dust.. Crushers may be used to reduce the size, or change the form, of waste materials so they can be more easily disposed of or recycled, or to reduce the size of a solid mix of raw materials (as in rock ore), so that pieces of different composition can be differentiated.
Both texts mentioned the use of vertical stamp mills for ore-crushing. Medieval French sources of the years 1116 and 1249 both record the use of mechanised trip hammers used in the forging of wrought iron. [9] Medieval European trip hammers by the 15th century were most often in the shape of the vertical pestle stamp-mill. [10]
The hammermill can be used as a primary, secondary, or tertiary crusher. Small grain hammermills can be operated on household current. Large hammer mills used in automobile shredders may be driven by diesel or electric motors ranging from 2000 to over 5000 horsepower (1.5 - 3.7MW).
Bucyrus-Erie 50-R, 55 feet high and housing a massive drill, was used in the successful rescue of two miners during the 1963 Sheppton, Pennsylvania mining disaster. [ 16 ] 1250-B/W and 1260-W walking draglines, with buckets between 33 and 45 cu yd (25 and 34 m 3 ).
Crusher attachments to construction equipment such as excavators can crush up to 100 tons per hour and make crushing of smaller volumes economical. [ 14 ] To produce clean aggregates from crushed concrete waste, very careful dismantling and demolishing is needed to keep the concrete stream away from other materials that would diminish its quality.
Allis Chalmers, during the period 1930–1965 and beyond, manufactured and marketed an extensive line of ore crushing equipment for the mining industry [49] In 1965, Allis-Chalmers built "Big Allis", or Ravenswood No. 3, the biggest generator in New York. It is located in Queens, has an output of 1000 MW, [50] and remains operational.
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