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NF Electromechanical Vibrating Feeders
Positive Drive components assure quiet operation of these vibratory feeders and reduce energy cost. The electromechanical drive is recommended for heavier loads and for hazardous environments, such as feeding coal.
NF Electromechanical Vibrating Feeders are designed such that burden does not dampen vibration, but actually boosts performance. Jeffrey Rader feeders are precision tuned near their own natural frequencies making them in tune with the materials they carry.
These sub-resonant tuning characteristics assure efficient material transference, promote quieter operation, and reduce energy and maintenance costs.
Rugged Deck Design
Computer-designed deck with rugged drive structure handles large lumpy materials with greater reliability.
Engineered for large deck sizes, its dependability reflects Jeffrey’s extensive design expertise from electromagnetic feeders.
Positive Drive Cog Belt
Positive drive cog belt offers 98% efficiency. It eliminates high tension friction and reduces wear commonly associated with V-belt drives. Maintenance costs are reduced because frequent belt adjustments or replacements are not required. Constant belt tension prevents slippage, extending bearing life.
Steel-Coil, Coupling Drive Springs
Pre-compressed, coupling drive springs assure constant spring rates for greater operation stability.
Steel springs feature low dampening coefficient, as well as consume less power compared with rubber or other type drive springs.
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Exciter Assembly
Totally enclosed in rugged steel housing, exciter assembly transmits vibrating forces, induces conveying action in materials. It features standard, severe-duty motor, motor-driven shaft with eccentric weight, plus heavy-duty, long-life, standard flange bearings which are externally mounted for ease of maintenance.
Standard Motor
Standard, inverter-duty motor reduces downtime, requires less maintenance. Off-the-shelf availability.
Frequency Controls
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Frequency controllers require less space and feature 10:1 capacity turndown for greater application flexibility.
Remote or local controllers, with automatic manual control circuits, provide for the addition of plant PLC’s for batching and inventory control.
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Innovative Technology Results In Larger Vibrating Feeder Loads Driven By Less Energy.
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The empty feeder operates along Curve A (dashed line) with its natural frequency at Point C. Stroke is indicated by Point G on the vertical axis, with the exciter frequency occurring at Point E.
Precision sub-resonant tuning drives large mass with minimal force. As shown, the burden is critical to the design, and it can actually improve the performance of the unit. Burden has a mass effect and a dampening effect on the mechanical vibration system of the feeder.
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Relationship of the burden to the complete feeder is illustrated in the drawing above |
The loaded feeder operates along Curve B (solid Line). Its natural frequency decreases to Point D because of the weight of the burden's mass. The dampening effect of the burden simultaneously changes the shape of performance Curve B, as illustrated. The exciter frequency also decreases from Point E to F as a result of the additional load on the motor. The stroke is now at Point H on the vertical axis.
Minimum Stroke Variation
Maximum stability under varying load requirements. This stability is the result of minimal stroke variances between empty and loaded conditions. Jeffrey has achieved this stability by engineering offsetting mass and dampening effect into the system. Adjusting the exciter frequency creates a smooth, effective variation of capacity (conveying speed). A simultaneous increase or decrease of exciter frequency and stroke can be achieved by adjusting motor speed.
For More Online Information
For more information, including dimensions and specifications, download our free NF Feeder brochure (PDF file - requires registration)
Support for your Jeffrey Rader Feeders
For the best performance and longest life, order your Feeder parts from Jeffrey Rader, and count on Jeffrey Rader Technical Services for field service, training and repairs. Even before you buy, Jeffrey Rader supports you with a free material test in the Jeffrey Rader Test Lab. You can request a material test online.
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