Hammer Mill Grinding – 4″ “Wet” Material


A small hammer mill for grinding high moisture material.1-year-warranty

  • Suit to coal/charcoal and ore whose moisture is more than 15%.
  • Milling type crushing offers efficient discharging.
  • Crushing large moist samples without moisture lose and with uniform output and high efficiency.china manufacturer
  • Plug-in sieve plates ensure convenient cleaning and maintenance.
  • Fully sealed cabinet design offers safe and dust free operation.
  • Low noise.


hammer mill

In a hammer mill, which can be used either as primary or secondary crushers, the breaking force is mainly due to a sharp blow applied at high speed to free-falling rock. The moving parts are beaters (hammers, rectangular plates, hanging bars or heavy metal rings). They move in a more or less fixed circle of swift rotation, though they are loosely suspended from pins on discs mounted on a driving shaft, inside a robust stationary casing with a grid through which broken undersize leaves the mill. The beaters weigh from a few up to 250 lb., and the larger machines can work on feed as coarse as 8″ cube. Fracture is chiefly produced by the flailing action as the beaters hit the ore as they spin at from 500 to 3,000 RPM, though part of the comminution results from shatter of particle against particle or casing plate. The hammers shown in Fig. 27 can be moved to pins nearer the disc’s periphery as they wear, and are readily reversible and removable. Wearing parts are of high-carbon steel or tough wearing alloys with manganese, chromium or molybdenum.

hammer mill working principle
Working Principle HAMMER MILL 

Both uni-directional and reversible hammer mills are manufactured. The former can be used over a wide size range of soft or friable material, in both primary and secondary crushing and the latter in secondary crushing. Reversal of the rotor direction obviates the need for turning the hammers round. A hammer mill with its breaker grid arranged like a miniature belt conveyor has been developed for sticky or wet feed liable to clog a fixed grating. Material which fails to fall through climbs against the down-running new feed.

Another type of hammer mill, the “Impactor” is designed to obviate stoppage for hammer adjustment. The rotor is reversible, and end-wear can also be taken up while running, by movement of the anvil blocks which regulate the set of the mill. Elimination of a retaining grid makes the machine able to cope with frozen or sticky feed and aids quick passage. The velocity with which the blow is struck in impact crushing is the main determinant of the severity of shock loading. The vertical distance of free fall as the feed enters is therefore a control factor. Care in arranging a suitable dropping height influences product shape, size and production of fines.

Among the minerals broken by hammer milling are limestone, spars, gypsum, shale, clays, coal, asbestos, gravels and rock required for ballasting or concrete aggregates. The products are characteristically sharply fractured. Moisture affects efficiency adversely, and wear on the beaters is heavy with abrasive material. Product size is controlled to some extent by varying the escape grid apertures, clearance and speed. Unlike the dry crushers hitherto considered, these machines are impact breakers.

hammer mill

hammer mill

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