It is used for crushing raw materials that have compressive strength less than 150MPa such as limestone, marl, sandstone, gypsum, coal, etc. The single stage hammer crusher can crush the ore block at the stope into the granularity required at a time. It can replace the traditional two-stage crusher and help simplify process flow, save infrastructure investment and production costs.
The basic principle is straightforward. A hammer crusher is essentially a steel drum containing a vertical or horizontal rotating shaft or drum on which hammers are mounted. The hammers are free to swing on the ends of the cross, or fixed to the central rotor. The rotor is spun at a high speed inside the drum while material is fed into a feed hopper. The material is impacted by the hammer bars and is thereby shredded and expelled through screens in the drum of a selected size.
The hammer crusher can be used as a primary, secondary, or tertiary crusher. A major disadvantage of the hammer crusher is the tremendous amount of wear (linings must constantly be replaced). Small grain hammer crushers can be operated on household current. Large automobile shredders can use one or more 2000 horsepower (1.5 MW) diesel engines to power the hammer crusher.
The main working parts of a hammer crusher is the rotor which has a hammer. The rotor is composed by main spindle, disk, pin shaft and hammer. Electrical motor drives the rotor making a high speed rotation in cavity. Material from the upper feeder mouth goes into the machine, and is broken by the blow, impact, shear and abrasive of high-speed hammer movement. Below the rotor are screen panel, size fraction smaller than the size of the screen hole for crushing. Discharged from the screen panel, the coarse size fraction larger than the screen hole is left for blow and... [continues]
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(2012, 04). Special Notes on Operating the New Hammer Crusher. StudyMode.com. Retrieved 04, 2012, from http://www.studymode.com/essays/Special-Notes-On-Operating-The-New-965540.html
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