|
EF Electromagnetic Vibrating Feeders
Jeffrey's EF Feeders Provide the Highest Capacity for Deck Size in The Industry
Plus, They Feature an Easy Access and Rebuildable Power Unit
Electromagnetic Vibrating Feeder Applications
Ideal for the bulk material feeding of:
- Aggregates
- Coal
- Minerals
- Chemicals
- Industrial Materials
- Various Blending Materials
Feature Overview of Jeffrey EF Electromagnetic Vibrating Feeders
|
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. |
Removable cover provides easy access
to rebuildable power unit |
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: Thanks to Jeffrey's long experience as a vibrating feeder manufacturer, you can find a 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
Field Service: Jeffrey provides field service personnel for commissioning, problem solving, and maintenance training.
Electromagnetic Operation
Jeffrey electromagnetic feeders operate through controlled, high-frequency vibration. This is accomplished with electrical pulses and a machine that is tuned to a mechanical resonant frequency that is higher than the electrical frequency of the power supply (sub-resonant tuning).
Electrical pulses in the coils create a series of magnetic pulls that attract the armature and the deck. Restoring forces in the bar oppose each pull, causing the armature to spring away from the magnet. At an electrical frequency of 60 cycles per second, the armature and the deck operate at 3,600 times per minute (the vibration rate of the feeder). Material is moved by a series of “jumps” that correspond to the frequency of the vibrations. The distance the bars travel can be changed by varying the voltage to the coils. 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 your requirements.
Feeder Control
The electrical controllers for our electromagnetic feeders are designed around half-wave rectification of AC power. The efficient switching mechanism of silicon controlled rectifiers produces DC impulses without wasteful resistor or rheostat energy loss. Plus, it provides a full 0 – 100% range of control. All standard controllers comply with NEMA 12 and CSA design standards, and a variety of custom controllers are available (consult our factory).
The control cabinet has a 115-volt push button for the magnetic contactor, which is in accordance with current NEC requirements. A separate control transformer is provided.
The solid-state control circuit includes a “soft-start” feature. A regulator, requiring no additional connection to the feeder(s), maintains vibration to within ± 0.002", provided the line voltage variations do not exceed +5% and the line frequency is ± 0.5 Hz.
Manual or process variable controllers are available. There are also variations of these two basic arrangements. These include simultaneous, proportional, and sequential control for several feeders; HI/LO switches for batch weighing or filling operations; AMP demand control that affords over-stroke protection and efficient and effective feed to process machinery, such as size reduction equipment.
Process Variable Control
Any process variable input transmittable in small current signals 4 - 20 mA can automatically increase or decrease material flow.
Manual Control
Varies the flow from 0 - 100% with a stepless potentiometer. Install the control cabinet at a local or remote location.
For More Online Information
Download the Jeffrey Feeder Brochures
For more information, including dimensions and specifications, download our free EF Feeder brochure (PDF file - requires registration)
Support for your Jeffrey Feeders
For the best performance and longest life, order your Feeder parts from Jeffrey, and count on Jeffrey Jeffrey Technical Services for field service, training and repairs. Even before you buy, Jeffrey supports you with a free material test in the Jeffrey Test Lab. You can request a material test online.
Ask a Question
Contact us online to ask a question or request information.
Request a Quote
Use our online form to Request a Quote
|
