Vibrating Screens

A vibrating screen separates material by size. It consists of a screen body with one or more decks of screen media, a vibrator mechanism, a drive and spring suspension on a support frame. The vibrator — shafts with counterweights — makes the body move on its springs, which lifts and conveys the material across the decks so that smaller particles pass through the openings and larger ones travel on.

Inclined screens such as the GELEN STE series use a circular motion from a single shaft at the screen body's center of gravity, with the deck at about 15° to 25° so gravity helps move the material; they suit general sizing, scalping and wet screening. Horizontal screens such as the GELEN ETE series use an elliptical motion from three shafts geared together on a horizontal deck; they give precise sizing, handle sticky or flaky material well and need less installation height.

Grizzly screens such as the GELEN ITE series have a heavy top deck of grizzly bars or wear-resistant plates that can take the impact of large run-of-mine material. They remove fines and soil before the primary crusher, which raises crusher capacity, reduces wear and keeps clay out of the product.

A dual drive screen such as the GELEN DD series is driven by two motors turning two parallel shafts in the same direction, held in phase by a toothed timing belt. In phase, the counterweights on both shafts add into one rotating force and the body runs a circular orbit, with the exciter load and the bearing duty split across two shafts. That lets the machine carry a much larger unbalance than a single eccentric shaft, on a horizontal, low-headroom deck — which is why it suits heavy moisture, dewatering and fine cuts.

One deck per separation: a screen with two decks produces three products, three decks four products, and four decks five. GELEN STE and ETE screens are available with two to four decks, ITE grizzly screens with two or three, and DD dual drive screens are configured for the duty, so the number of decks can match the products the plant sells.

Consider the material (size distribution, moisture, stickiness, abrasiveness), the products and separation sizes you need, the throughput, whether the screening is wet or dry, the available installation height and the screen's position in the plant. The screen's motion type and deck area follow from these. GELEN engineering sizes the screen from your material data.

Inspect and replace worn screen media, check springs and suspension, keep the vibrator bearings lubricated as specified, and check drive alignment and bolted connections. A regular schedule prevents media failures, cracks in the screen body and unplanned stops.

GELEN screens take woven wire mesh, polyurethane panels, rubber panels and, for scalping, grizzly bars. Wire mesh gives the largest open area for dry sizing; polyurethane and rubber last longer in wet and abrasive duty and run quieter; grizzly bars take the impact of large feed. Decks can mix media, for example rubber on the top deck and polyurethane below.

Yes. GSS fine sand screens are horizontal screens in a 6 × 20 ft (1.8 × 6.1 m) package built for 40/70 mesh sand cuts. They run at a nominal 6 g acceleration for sharp separation, take material straight from a dryer with a high-temperature dust seal, and can also work wet. Contact GELEN for sizing.