Quick Answer

To choose the right exciter for a VIBRATING SCREEN, start with the required vibration motion and operating duty, then match excitation force, speed, eccentric moment, amplitude, shaft configuration, bearing capacity, lubrication system, and mounting dimensions. Do not select by kN rating alone — the exciter must work as part of the complete screen system.

Key Takeaways

• Exciter selection is a system-matching problem, not a product-size selection.

• The operating mass includes screen box, media, cross beams, exciter, springs, and material on the deck.

• Single-shaft systems typically produce circular motion; dual-shaft systems produce linear motion.

• Force and speed must be considered together: F = m × r × ω².

• Peak amplitude and peak-to-peak displacement are different values — confirm the definition.

• Motor power alone does not define an exciter.

• Increasing eccentric mass beyond specification can reduce bearing life.

Summary Table

Definition

A vibrating screen exciter is the component that generates the periodic force moving the screen box. That movement determines how material is stratified, transported, and separated across the screening surface. The exciter, screen structure, springs, screening media, and drive system form a dynamic system — the exciter cannot be selected in isolation.

Working Principle

For an eccentric rotating mass, the idealized centrifugal force relationship is:

F = m × r × ω²

Where F is centrifugal force, m is eccentric mass, r is eccentric radius, and ω is angular velocity. Because angular velocity is squared, speed changes have a disproportionate effect on generated force.

Frequency in Hz relates to speed as: Frequency (Hz) = RPM / 60. For example, 900 RPM corresponds to 15 Hz.

Amplitude describes displacement of the vibrating system. Peak amplitude and peak-to-peak displacement differ by a factor of two — 4 mm peak equals 8 mm peak-to-peak.

Benefits

Correct motion. Matched exciter maintains required stratification and transport across the deck.

Stable throughput. Adequate excitation prevents material accumulation under load.

Bearing life. Correct eccentric mass and amplitude protect bearing service life.

Reduced dynamic stress. Correctly sized excitation avoids excessive structural loading.

Compatibility. Verified mounting and shaft geometry ensures correct installation.

Maintenance predictability. Correct lubrication and sealing extend service intervals.

Applications

Exciter selection depends on the screening duty. Common duties include primary scalping, coarse classification, fine screening, wet screening, dewatering, sizing of crushed aggregate, iron ore classification, coal preparation, and mineral processing.

Coarse heavy material places substantial impact and dynamic loads. Fine screening may require different frequency and amplitude combinations. Dewatering applications have different material and process requirements.

Screening sits between CRUSHING and GRINDING in the comminution circuit.

Material Comparison

Application Comparison

Industry Application Matrix

Selection Guide

Seven inputs determine the correct exciter:

1. Screening application — duty, material type, particle size distribution, moisture, throughput, screening objective.

2. Operating mass — screen box, screening media, cross beams, exciter assembly, springs, material on deck.

3. Required vibration motion — circular or linear; single-shaft or dual-shaft arrangement.

4. Pub Time : 2026-10-05 08:56:01 >> News list