As standard, cylindrical breaker plates encircle the upper half of the mill chamber, while bed screens encircle the lower half. However, when greater throughput of easily-reduced materials is desired, a 90° section of breaker plate located below the hinged top section of the mill case can be substituted with a 90° cylindrical section of bed screen, increasing total screen area to 270°.

Material is fed through the infeed hopper at the top of the mill, while on-size particles exit through a lower flanged outlet, and are typically removed by dilute-phase vacuum collection, or are gravity fed into a downstream process.

The heavy-gauge housing provides the stiffness required to maintain precise alignment, and withstand the extreme impact and high loads of the most demanding applications.

The rotor assembly, which is powered by a fully guarded, directly-coupled drive, rides on sealed flange-block bearings mounted on a heavy-gauge fabricated and machined housing, providing vibration-free operation.

Carbon steel or stainless steel construction in a range of finishes is offered to satisfy virtually any industrial requirement.

IMPORTANT NOTE: Since all hammer mills are limited in terms of particle size control and prevention of fines, MUNSON Centrifugal Impact Mills (Pin Mills) and MUNSON SCC™ Screen Classifying Cutters may alternately be considered.

The shaft assembly consists of a primary shaft of alloy steel, multiple shaft discs and six quick-disconnect hammer mounting bars with "stepped-tip" hammers shown standing at 90° to the rotating shaft from centrifugal force. (Shown in open position for demonstration purpose only. Never bypass safety devices to operate in open position.)

Mill case and hinged access door — both constructed of welded heavy-gauge carbon steel and machined flanges — are secured by an equally robust latch assembly.

• Large, obstruction-free product feed opening
• Peripheral hammer velocity from 3,600 to 24,000 ft/min (1,100 to 7,300 m/min) together with hard-faced breaker plates and perforated bed screen, reduces wide range of material types and sizes at high rates
• Greater output per horsepower/kilowatt than many other types of mills
• Hardened steel hammers with "stepped ends" offer three-times the cutting edges of square-end hammers
• Four-way reversible design allows all stepped hammer corners to be utilized prior to replacing
• Radiused bed screens with perforations from 1/32 to 3 in. (0.8 to 76 mm)
• Lower transition for pneumatic removal of reduced materials
• Hinged mill case door provides unobstructed interior access for rapid inspection and changing of breaker plates, screens and hammers
• Machined mating surfaces of door and mill case provide dust-tight operation
• Directly-coupled drive

• Welded heavy-plate carbon steel mill case maintains precision alignment of dynamically-balanced rotor assembly despite extreme impact and high loads of demanding applications
• Horsepower range from 50-250 HP
• Directly-coupled drive
• Welded heavy-plate carbon steel mill case maintains precision alignment of dynamically-balanced rotor assembly despite extreme impact and high loads of demanding applications
• Horsepower range from 50-250 HP

Closed access door of HammerHead™ mill case holds cylindrical breaker plates and bed screens captive. Shown with full-width inlet at top, and transition at bottom for pneumatic removal of reduced material.

• Stainless steel construction to industrial standards
• Change-out of 90° breaker plate section with 90° bed screen section, increasing total cylindrical bed screen area to 270° of mill chamber for maximum output
• Bar-type "bed screens"
• Square tipped hammers
• Pre-crusher installed ahead of the hammer mill for initial reduction of large pieces and/or uniform feeding of small pieces
• Controls including variable speed drives
• Rotational sensors for feedback to automated systems
• Legs to raise discharge height
• Air purge seal assembly with external pillow block bearings for extremely demanding applications
• Integral fan and blower assembly
• Special configurations

Each of six secondary shafts can be fitted with heavy, light or alternating heavy-light hammers to suit material characteristics. (Optional square-tip hammers shown)

• Animal feed, biomass, corn
• Batteries
• Bulk spices, herbs, food products
• Carpet and carpet grindings
• Ceramics, cement, lime
• Chemical products in bulk and solid form
• Coal, slag
• Glass bottles, cullet, syringes
• Grains, seeds and shells
• Filings, turnings, shavings

• Mining materials
• Paper/newspaper
• Plastic parts, housings, reinforced composites
• Roof shingles
• Rubber-steel-cord separation
• Storage media, hard drives, PCBs, phones/electronics of all types
• Sugarcane
• Wood bark, scrap, chips, shavings, particle/fiber board, hogged scrap