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Hammer Mill Reduces Friable, Fibrous Materials

Hammer Mill
Hinged door of Hammer Mill provides rapid access for changing of hammers, hammer pins and screens.
Hammer Mill
Centrifugal force of hammers that pivot freely on discs rotating at high speed pulverizes friable materials into fine particles. Bed screens located below and behind the rotating assembly are not visible.
UTICA, NY — A new Hammer Mill Model 141 from Munson Machinery reduces friable and fibrous materials into uniform particle sizes ranging from 20 to 300 mesh.

Centrifugal force causes pivoting hammers to stand at 90 to the rotating shaft, throwing material against breaker plate ridges in the feed section, and then against perforated bed screens through which sized material exits.

The shaft, integral hammer discs, disc pins and hammers are driven by a 75 hp (56 kw) motor at 1800 to 4000 RPM, achieving hammer tip speeds of 8,700 to 19,500 ft/min (2,650 to 5,950 m/min) even under heavy loads, reducing a broad variety of solid material into particles at high rates.

The mill can pulverize wood scraps, process grain, break-down impact resistant housings, destroy ammunition shells, pulverize newspaper, separate rubber from cord fiber, and reduce the size of a variety of other chemical, plastic, rubber and agricultural products.

Particle size is determined by the size of the screen perforations. In addition to a lower 180 cylinder screen, the Munson unit features an extra 90 screen located in the hinged section of the top case, increasing screen area by 50% to a total of 270, utilizing the entire area of the case.

The lower screen is secured by a quick release mechanism, providing a dust-tight fit and allowing rapid screen changes.

Hammer discs, which are spaced evenly along the alloy steel shaft, retain the hardened steel hammer pins. All corners of the hammers are stepped, allowing four edges to be utilized. A removable ring allows rapid pin changes.

The steel fabricated, 3/4 in (19 mm) thick mill case provides the requisite stiffness, alignment and durability to withstand the extreme impact and high loads associated with the most demanding applications. The feed intake welded to the upper portion of the case is also bolted to the lower portion, resulting in a high-integrity connection between the feeding or loading hopper and the mill intake.

Dust-tight and watertight, the unit is configured with a hinged top section and gasketted, single-latch door providing rapid access for cleaning and maintenance.