Lvlon makes bulk material handling equipment in Henan, China. The LL series electromagnetic vibrating feeder serves mining, metallurgy, coal, building materials, chemical, pharmaceutical, food and abrasives industries-feeding crushers, screens, mills, belt conveyors, bucket elevators and batching scales. In-house steel fabrication, coil winding and control box assembly. Factory-direct pricing. OEM on trough type, material and control configuration.
How It Works: The Magnet That Beats 50 Times a Second
The feeder has no motor. Its heart is an electromagnet. Alternating current passes through a half-wave rectifier (a TRIAC), becoming a one-directional pulsing current. When the pulse flows through the coil, the electromagnet pulls the armature-and the trough moves backward, compressing the main leaf spring and storing energy. When the pulse ends, the spring releases that energy and throws the trough forward.
This happens 50 times per second: 3,000 vibrations per minute. The trough vibrates at a 20° angle with 1.5–3 mm amplitude. Each cycle throws the material up and forward-it travels in a parabolic hop (6–18 m/min) and lands further ahead. Because the material spends most of its time airborne, it barely touches the trough. Trough wear is minimal-which is why a 3–5 mm steel plate trough is sufficient.
The result is a machine with no rotating parts and no lubrication points. No bearings, no gearboxes, no eccentric blocks, no belts. The only fatigue component is the leaf spring, whose service life is measured in years.
The Control Advantage: A Knob Instead of a Gearbox
Mechanical feeders change their rate by changing mechanisms-variable-speed drives, gate positions. The electromagnetic feeder changes its rate with a knob. The TRIAC controller adjusts the conduction angle of the half-wave rectified current. More conduction, stronger magnetic pull, bigger amplitude, more material. Less conduction, less material. From zero to full flow, continuously, instantly.
This is why the electromagnetic vibrating feeder is the standard choice for batching and dosing. A batching scale measures the material; the controller opens and closes the feed; the feeder starts and stops the flow in the same instant the signal arrives. Quartz sand dosing, PVC pellet blending, chemical fiber powder feeding-processes that need "exactly this much, exactly now." Vibration-motor feeders need a variable-frequency drive for the same control-more expensive, weaker at low speeds, slower to respond.
The Power Paradox: 60 Watts Feeding 5 Tonnes per Hour
The dual-mass near-resonance design is the reason. The trough and the exciter form two vibrating masses connected by the main spring. The system operates near its natural resonance frequency-a small exciting force maintains a large amplitude, the way a small push on a swing maintains a big arc. The LL1 draws 0.06 kilowatts-a light bulb-and feeds 5 tonnes per hour. The entire feeding system of a crushing line draws less than 10 kilowatts. No mechanical transmission losses, no gear oil, no drive belts.
Specifications
| Model | Capacity (t/h, level / -10°) | Max feed size | Current | Power | Controller |
|---|---|---|---|---|---|
| LL1 | 5 / 7 | 50 mm | 1.34 / 1.0 A | 0.06 kW | XKZ-5G2 |
| LL2 | 10 / 14 | 50 mm | 3.0 / 2.3 A | 0.15 kW | XKZ-5G2 |
| LL3 | 25 / 35 | 75 mm | 4.58 / 3.8 A | 0.20 kW | XKZ-5G2 |
| LL4 | 50 / 70 | 100 mm | 8.4 / 7.0 A | 0.45 kW | XKZ-20G2 |
| LL5 | 100 / 140 | 150 mm | 12.7 / 10.6 A | 0.65 kW | XKZ-20G2 |
| LL6 | 150 / 210 | 200 mm | 16.4 / 13.3 A | 1.20 kW | XKZ-20G3 |
| LL7 | 250 / 350 | 250 mm | 24.6 / 20.0 A | 3.00 kW | XKZ-100G3 |
| LL8 | 400 / 560 | 300 mm | 39.4 / 32.0 A | 4.00 kW | XKZ-100G3 |
| LL9 | 600 / 840 | 350 mm | 47.6 / 38.6 A | 5.50 kW | XKZ-200G3 |
| LL10 | 750 / 1,050 | 500 mm | 39.4×2 / 32×2 A | 4.00×2 kW | XKZS-200G3 |
| LL11 | 1,000 / 1,400 | 500 mm | 47.6×2 / 38.6×2 A | 5.50×2 kW | XKZS-200G3 |
Variants: Top-drive LL3S–LL8S (exciter mounted above, for tight spaces) | Enclosed LL1F–LL6F (dust-tight) | Light-trough LL5Q–LL8Q (low-density material) | Flat-trough LL5P–LL7P (thin-layer uniform feed) | Tubular LL1G–LL5G (pipeline conveying)
All models: 3,000 vibrations/min, amplitude 1.5–3 mm, 20° vibration angle, material speed 6–18 m/min. Carbon steel painted or stainless steel polished. 1-year warranty. OEM available.
Installation Angles: Three Settings for Three Jobs
The trough angle decides how the feeder behaves. Level installation: material does not flow by itself-the feeder "locks" the material after the hopper gate closes, preventing self-discharge. Downhill 10°: standard continuous feeding. Downhill 15°: sticky or damp material, which needs gravity help because it clings to the trough and hops poorly.
If the feeder runs slow or with reduced amplitude, check the angle before touching the electrics. Insufficient trough inclination is the most common cause. Then check the supply voltage, the coil, and the TRIAC conduction angle.
FAQ
Q: The feeder stopped feeding. What do I check?
Three causes, in order. 1) Wrong gap between the iron core and the armature-reset to the standard gap. 2) Overfeeding piled material on the trough, jamming it-clear the pile first. 3) Loose leaf-spring retaining bolts-retighten.
Q: Electromagnetic or vibration-motor feeder?
Electromagnetic: stepless TRIAC speed control, instant start/stop, no rotating parts, no lubrication, tiny power draw (LL1: 0.06 kW), precise dosing. Vibration-motor: eccentric weights, needs a VFD for speed control, has bearings and lubrication points, better suited to very large rough flows. Precision feeding → electromagnetic. Flows beyond 1,400 t/h → motor-driven or mechanical feeders.
Q: Can it handle sticky or wet material?
Only with the 15° downhill angle and even then within limits-sticky material defeats the hopping motion entirely. Highly adhesive material needs a different feeding approach. The feeder is designed for dry bulk: lumps, granules and powders from 0.6 to 500 mm.
Contact Lvlon for model selection, hopper interface design and factory quotation.
