A round vibratory separator is a circular screening machine that uses a vertically mounted vibratory motor to generate a three-dimensional gyratory motion, moving material across horizontally mounted screen decks to separate particles by size, remove contaminants, or classify powders and granules. It is the most common type of vibratory screening equipment for precision particle size separation in food, pharmaceutical, chemical, and mineral processing.
The working principle is straightforward: material is fed through a feed inlet at the top center of the machine, where it lands on the top screen deck. Counterweights on the motor shaft generate a controlled vibration pattern that moves material in a spiral path from the center outward. Undersize particles fall through the screen cloth while oversize material travels to the discharge spout at the perimeter. Multi-deck configurations can separate a single feed into up to six fractions.
Round Vibratory Separator Sizes
| Diameter | Screening Area | Typical Throughput | Best For |
|---|---|---|---|
| 18" | 1.4 sq ft | Up to 500 lb/hr | Lab/pilot, small-batch QC |
| 24" | 2.5 sq ft | Up to 2,000 lb/hr | Small production, check screening |
| 30" | 4.2 sq ft | Up to 5,000 lb/hr | Mid-volume production |
| 48" | 11.4 sq ft | Up to 15,000 lb/hr | High-volume production |
| 60" | 19.6 sq ft | Up to 30,000+ lb/hr | Maximum throughput production |
Why This Matters in Vibratory Screening
- Precision separation — The gyratory motion of a round separator provides more controlled material residence time on the screen surface, improving screening efficiency compared to linear-motion machines.
- Multi-fraction capability — Stack up to five decks to produce six size fractions from a single feed stream, reducing equipment footprint.
- Compact footprint — Round separators fit into tight spaces and can be stacked vertically, making them ideal for retrofit installations.
- OEM compatibility — Round separator designs from Sweco, Kason, Midwestern Industries, and Cleveland Vibratory use similar screen frames, allowing ScreenerKing replacement screens to fit interchangeably.
Related Glossary Terms
- Vibratory Screener — The broad equipment category
- Vibratory Separator — Synonymous term emphasizing the separation function
- Rectangular Vibratory Screener — The linear-motion alternative
- Gyratory Sifter — A related machine type with different motion characteristics
- Counterweights — The mechanism that generates vibratory motion
- Deck — Individual screen levels within the separator
Round Vibratory Separator FAQs
What is a round vibratory separator?
A round vibratory separator is a circular screening machine with one or more horizontal screen decks driven by a vertically mounted motor with counterweights. The motor creates a gyratory motion that moves material from the center feed point outward across the screen, separating undersize particles through the mesh while conveying oversize material to a discharge spout at the perimeter.
What is the difference between a round separator and a rectangular screener?
Round separators use gyratory motion and are ideal for precision grading, check screening, and multi-fraction separation with up to 5 decks. Rectangular screeners use linear motion, handle higher tonnages, and are better for continuous high-volume processing.
ScreenerKing Round Vibratory Separators
From the SiftPro 18" for lab and small-batch screening to the SiftPro 60 for high-volume production, ScreenerKing offers a full range of round vibratory separators. All units are compatible with OEM replacement screens and parts.