A vibrating conveyor is specified by three engineering decisions — drive class (electromagnetic vs unbalanced-motor), trough geometry (linear, trough, or spiral), and material/liner choice (304/316 stainless, mild steel with rubber or PTFE lining) — and capacity typically scales from 1 t/h on small electromagnetic feeders to 500 t/h on heavy-duty eccentric-motor troughs handling abrasive ore or hot clinker [S1][S2].
For 2026 plant projects the technology sits in a mature band: JÖST and Vibra Schultheis continue to ship freely vibrating spiral and trough units, both built around resonant-spring isolation to keep base reactions low [S1][S2]. The selection exercise is therefore less about novel technology and more about disciplined matching of stroke, frequency, amplitude, and trough width to the bulk product's angle of repose, moisture and abrasion index, before quoting a vendor [S3].
Drive Class: Electromagnetic vs Unbalanced-Motor
Electromagnetic drives deliver high frequency (typically 50–100 Hz), low amplitude (0.5–2 mm) and are the standard pick for fine, dry, non-abrasive powders and for precise dosing, with stroke control via thyristor or PWM amplitude regulators [S1]. They cannot move coarse rock or hot aggregate; the coil and armature heat-soak limit continuous duty, so electromagnetic units are usually limited to feeder duty under ~10 t/h.
Unbalanced-motor (eccentric) drives operate at lower frequency (16–25 Hz, 1000–1500 rpm on a 4- or 6-pole motor) with higher amplitude (3–12 mm) and stroke proportional to motor rotation speed; the same mechanical frame is used for horizontal, slight uphill (up to 5–8°), or spiral-elevator configurations by reorienting the trough [S1][S2]. Two-motor opposed designs with twin vibromotors are the default for trough conveyors carrying abrasive bulk, hot clinker, foundry sand, or 50–500 t/h mineral flows. Resonant (twin-mass) designs add a spring-reaction mass to cut the dynamic load seen by the supporting structure, which matters on elevated installations.
Trough Geometry: Linear, Trough, and Spiral
Linear (pan) troughs handle fine bulk across the shortest distance and feed downstream screens or crushers; trough-shaped pans are used for larger lump sizes up to 100–200 mm and contain the load on inclined runs [S2]. Spiral configurations from JÖST occupy a much smaller footprint than inclined belt or chain conveyors of equivalent capacity, because the material rides upward in a helical trough with a vertical height often 3–6 m before discharge — useful in confined bulk-solids plants where headroom for an inclined belt is limited [S1].
Vibra Schultheis specifies a "maximum conveying distance" on its freely vibrating trough conveyors, which for a single resonant unit lands in the 4–8 m horizontal range before resonance re-tuning is needed; longer runs are built as multiple cascaded units rather than a single long trough [S2]. For the buyer, this means the layout question — distance, lift, turns — should be settled before the drive class, because the geometry dictates the mass, spring rate, and motor power the drive must swing.
Material of Construction and Liner Selection
Stainless-steel troughs (1.4301 / 304 or 1.4404 / 316L) are specified for food, pharmaceutical, and chemical duty where clean-in-place and corrosion resistance dominate; the heavier gauge adds moving mass and therefore cuts achievable stroke at a fixed motor power, which the vendor must re-rate [S2]. Mild-steel troughs with replaceable rubber, polyurethane, or PTFE liners cover abrasive ore, foundry sand, and hot-aggregate duty, with liner thickness typically 6–20 mm depending on impact energy and temperature.
For hot applications (clinker, slag, sinter at 200–600 °C) the trough is built from heat-resisting steel with air-gap or water-cooled isolation between the hot trough and the spring/motor mass; the temperature ceiling of standard natural-rubber isolators is around 80 °C, and silicone or metal-spring isolation extends that to ~200 °C. Beyond that, refractory-lined troughs or alternative equipment — for example, a belt conveyor with steel cord belt, or a pneumatic conveyor for fine-only flow — should be evaluated instead.
Capacity, Stroke, and Frequency: The Sizing Triangle
Three numbers set the throughput: trough cross-section (width × depth), bulk density, and the conveying velocity produced by stroke and frequency. For an unbalanced-motor trough operating at 16 Hz with 6 mm stroke, the theoretical peak velocity of the trough is π·f·s ≈ 0.30 m/s, but effective material transport typically runs 30–50% of that figure, or ~0.1–0.15 m/s, due to slip and partial lift cycle [S1][S2].
Capacity scales roughly linearly with trough width: a 400 mm wide trough handling sand at 1.6 t/m³ typically lands near 15–25 t/h, a 600 mm trough near 40–60 t/h, and 1000–1200 mm wide heavy-duty troughs on 2 × 7.5 kW vibromotors reach 200–500 t/h in mineral service. Amplitude is set by the eccentric mass and motor speed (centrifugal force F = m·e·ω²), so a higher-capacity machine is a heavier machine — the buyer should confirm the support-structure dynamic load before the foundation is poured, not after.
Selection Criteria Comparison: Drive Types Side by Side
Comparing the two main drive options on the four criteria that actually drive the purchase decision: electromagnetic units win on control precision and energy use at low throughput, unbalanced-motor units win on mechanical robustness and throughput ceiling. [S1]
Electromagnetic drive: typical capacity 0.1–10 t/h, frequency 50–100 Hz, amplitude 0.5–2 mm, best fit for fine dry powders, dosing, and small pan feeders; not suitable for hot, abrasive, or lumpy bulk. Unbalanced-motor (eccentric) drive: typical capacity 5–500 t/h, frequency 16–25 Hz, amplitude 3–12 mm, best fit for abrasive mineral, hot aggregate, and coarse lump; controlled but less precise at the low end. Resonant / twin-mass: a sub-type of the eccentric family with a reaction mass to lower the dynamic reaction on supports, typically specified where a vibrating conveyor is mounted on an elevated floor or mezzanine with limited structural margin [S1][S2].
For orientation, a horizontal or slightly inclined linear trough suits short transfer of dry bulk; a deep trough suits lumpy or hot material; a spiral configuration suits vertical lift in a small footprint where an inclined belt conveyor or overhead conveyor would consume too much floor space [S1].
Application Fit and Limits
Vibrating conveyors are at their best on dry, granular, lumpy, or hot bulk that does not pack, smear, or fluidise — sand, gravel, ore, clinker, foundry sand, pellets, and grain. They handle temperature extremes better than rubber-belt conveyors and are easier to seal against dust than open belts, with fully enclosed troughs standard in many mineral-handling specifications. [S2]
They are the wrong tool for sticky, wet, or stringy material (bagasse, wet clay, fibre), for fragile finished goods that cannot tolerate vibration, and for sanitary food contact above ambient — in those cases a pneumatic conveyor or stainless belt conveyor is the cleaner fit. Also note: vibrating conveyors are not high-angle elevators; even spiral units top out at 3–6 m lift, so for a true vertical lift to a second floor a bucket elevator or chain conveyor is still the default.
Specifying a Quote: What the Vendor Must Confirm
A buyer-ready spec should pin down bulk density (t/m³), particle size distribution (dmax, % fines), moisture (% w/w), temperature (°C), required capacity (t/h), conveying distance and lift (m), trough width (mm), and environment (ATEX zone, wash-down, dust). The vendor's reply should include installed power (kW), motor poles / unbalance weight (kg·cm), stroke (mm), trough loading (kg/m), and the resulting dynamic reaction force at supports (N) [S1][S2].
For ATEX/IECEx zones 21/22 dust environment, both the drive motors and any terminal box need the relevant explosion-protection rating matched to the zone; for food-grade duty, surface finish (Ra value), weld polishing, and gasket material become deciding factors, alongside the basic 304 vs 316L question [S2]. Buyers comparing multiple vendors should fix these numbers in the RFQ rather than ask "what can you supply at X t/h" — otherwise the quotes will be on different duty cycles and not comparable.
Verification Before Purchase
Before signing the PO, three checks save the most rework: ask for a reference list of at least two installations handling the same bulk product at ±20% of the target tonnage, ask for a factory acceptance test (FAT) of stroke, current draw and trough temperature at full load, and confirm the spring isolation package matches the support structure's natural frequency by at least a 3:1 ratio to avoid resonance walk. [S3]
For related process-engineering selection logic across the bulk-handling chain, the pneumatic-conveying sizing approach for phase mode and solids loading covers the fine-powder counterpart, and the submersible vs centrifugal pump spec-first logic addresses the liquid end of a bulk line — both reference points a vibrating-conveyor spec typically touches on either side of the trough. Trackable signals through the rest of 2026: JÖST and Vibra Schultheis updating their freely-vibrating trough distance limits for cascaded runs, and any movement on ATEX/IECEx zone 21 motorised-vibro driver certification on dual-motor opposed designs [S1][S2].