PMR Rotary Feeder

The PMR rotary feeder combines a stationary tool-steel knife and a rotor with helical vanes to provide a shearing action for cutting off oversized materials in a feedstock, minimizing jamming or interruption of the feed. Functionally, the PMR is both a metering device and an airlock. PMR feeders are built for long, continuous operation with provisions for eventual rebuilding.

PMR Rotary Feeder

Common Applications

  • Pneumatic conveying systems
  • Boiler feed
  • Cement alternative fuel systems
  • Co-generation operations
  • Biomass-fired power generation
  • MSW-fired power generation
  • Pulp & paper mills
  • Wood chips
  • Bark
  • Mixed wood fuels
  • Mixed plastics fuel
  • Tire-derived fuels
  • Refuse-derived fuels
  • Plastic flake
  • Peanut hulls, nut shells
  • Forest waste, ag waste
  • Construction & demolition waste

Key Advantages

Wear resistance built-in for long-running cycles before rebuilding or replacement should be considered; a minimum of one year for the most abrasive products up to 5-7 years or more for less abrasive products.

Adaptable to unprepared or minimally-prepared fuels.

Precision-machined housings and rotors to minimize rotor-to-barrel clearances and limit blowby (leakage) in pneumatic conveying applications.

Optional Tri-Braze barrels are well-suited for handling abrasive materials and can often double the cycle between rebuilds.

Problems Solved

Variations in product/fuel quality, dimensions, moisture, etc. have no impact on PMR feeder performance; alleviates the need for extensive pre-processing of the product/fuel as the feeder can adapt to varying, non-homogenous conditions.

Foreign objects or material-other-than-fuel are often found in product streams; the robust design of the PMR feeders handles dirt, sand, small rocks, and small metal such as nails or screws with minimal disruption to your process and minimal damage to the feeder.

Fuel availability and pricing for various types of fuels can make an economic difference to your plant’s operations.  PMR feeders are adaptable to a wide range of fuel types and specifications without changing the feeder configuration or options; this provides maximum flexibility to source fuels.

How It Works

Fabricated housing with an integral mild steel or Tri-Braze barrel; barrel thicknesses from 5/8” to 1-1/8” thick depending on feeder size.

Barrel is precision-bored to a concentric, known diameter to provide a true fit with the rotor.

All barrels are overlaid with an industrial hard chrome, typical thickness is 0.005” to 0.009” depending on feeder size – provides the first-line defense against abrasive wear.

Rotors are an 8-vane, helical arrangement with closed ends; leading edge of each rotor vane is tipped with 308 SS for wear resistance and each rotor end has an integral scraper to minimize material buildup.

The knife-seat is CNC-machined for precise location and a no-slip placement of the tool steel knife to assure good knife life and effective material shearing.

An access door in the feeder housing makes knife adjustment or replacement easy.

The endbells include adjustable brass seals to minimize the possibility of pressurized air migration past the rotor end in pneumatic applications.

Heavy-duty Dodge piloted flange bearings installed outboard of the housing to isolate heat, moisture, and dirt from the bearings.

Nord, SEW, or Sumitomo shaft-mounted gear-motor drive packages for clean, safe installations providing direct application of power with options for variable speeds and other functions.

Options and Upgrades Available

Four configurationsSuit the physical layout of your plant, pneumatic line flow direction, and service access: RH or LH rotor helix and CW or CCW rotation.
Pneumatic line T-Injectors Smooth injection of your material into the convey line
MSHA/OSHA-Compliant Shaft Guards Operations and maintenance staff safety
Zero Speed Sensors Detect and then alarm or notify that the feeder is not operating
304 or 316 stainless feeder construction For corrosive applications
Specialty options for the most severe applicationsStainless steel shaft sleeves, replaceable AR400 rotor tips, double-knife configurations, plow knives, and oversized tool-steel knives.

Technical Specifications

Material TypesMaximum particle size varies by feeder size; ½” to ¾” cross-sectional dimensions can normally be fed – depending somewhat on the wood species, dryness, and other factors.

Green chips with high moisture content up to 30-40% or more can be fed in a standard PMR configuration; above 30-40% moisture, particularly for Southern Yellow Pine chips or residue, stainless steel construction may be recommended.

Chips or wood residue with high pitch content may lead to a build-up of pitch on the barrel surface; this causes no harm to the feeder and there is no specific recommended feeder configuration or option to combat this but it will require more frequent maintenance.

Most PMR feeder applications are for ambient temperature products. In some cases, dryer discharge in a wood pellet plant for example, the product temperature may be elevated. PMR feeders can be operated with product temperatures up to 1000° F.
Power RequirementsDrive motors powered by:
230/460V 3Ph 60Hz
575V 3Ph 60Hz

Other voltages and frequencies available.

Zero speed sensors operate at control voltage.

VFD’s operate single-phase up to system voltage.

Let our applications specialists help you with your extreme-duty bulk material handling needs.