By Greg Fenrick

InfoMine’s Dictionary defines a feeder as a conveyor or bunker structure for delivering coal or other broken material at a controllable rate. Jeffrey is a leader in the industry with over 100 years of experience manufacturing feeders and crushers. Many feeders are still operating after 50 years. Jeffrey offers three feeder models, the EF and HP, which are electromagnetic, and their NF, which is electromechanical. Of these models, Jeffrey's EF feeders provide the highest capacity for deck size in the industry, which is briefly described below.

Jeffrey electromagnetic feeders operate through controlled, high frequency vibration. Material is moved by a series of “jumps” that correspond to the frequency of the vibrations. Varying the voltage to the coils can change the distance the bars travel. With this variation in the length of each “jump,” or vibration amplitude, the conveying speed of the material on the feeder deck changes, resulting in a capacity rate that fits almost any mining requirement. Unique features of the EF include:

  • Removable Covers: Removable side and rear covers allow easy access to the power unit.
  • Rebuildable Power Unit: Rebuildable power unit assembly simplifies maintenance and lowers the total cost of ownership.
  • No Moving Parts: The feeder’s electromagnetic operation has no moving parts in the drive mechanism. This eliminates wear and the need for replacement parts, as well as assures trouble-free service in all types of environments.
  • Sub-Resonant Tuning: As the deck liner wears, sub-resonance tuning assures efficient, continued feeder operation. Controls are infinitely adjustable over a 0 - 100% operating range, using solid-state circuits.
  • High-Frequency Vibration: With an appropriate deck slope, high-frequency vibration affords conveying speeds as high as 65 FPM. This vibration is maintained even with varying line power fluctuation.
  • Design Flexibility: Variety of deck sizes and styles to meet your application needs:
    • Open
    • Enclosed
    • Tubular
    • Grizzly
    • Power Unit Overhead
    • Conveyors with Multiple Power Units
    • Decks with Screen Sections

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