Top-Driven Screen

The top-driven screen is a screen with elliptical vibration; because the ellipse direction changes along the deck (forward at the rear, backward at the front), its screening efficiency is higher than a conventional circular-motion screen. Capacity is 100-400 tph and the models are ELK-U2050, ELK-U2060 and ELK-U2460. The frame is built bolted and weld-free throughout; media change is practical and the inlet is guarded by Stone-box chutes.

What sets elliptical motion apart

Short eccentric-weighted shafts are linked by a cardan shaft; each bearing group has 2 dedicated screen bearings. Flow speed is high at the rear of the deck and low at the front.

• Elliptical motion = a mix of circular and linear motion; contact frequency and efficiency are high.
• All material contacts the aperture; residence time increases at the front → efficiency rises.
• Elliptical motion reduces aperture blinding/pegging → an advantage on wet and washed material.

Dimensions and power ratings

Screens under 14 m² use 2 bearing groups, larger ones 4. The 3-deck screen produces 4 fractions. Capacity depends on material gradation, moisture and whether screening is wet or dry; mesh apertures are set to order.

Suitable materials

Quarry and riverbed plants requiring high efficiency; because elliptical motion reduces blinding, it can also be used as a washing screen. On wet, near-size-heavy material it outperforms a conventional circular-motion screen.

Scope of supply

The top-driven screen delivers its best efficiency when paired with washing units; that is why General Makina engineers it in the same file as screw/log washers, crushers and the batching plant. Long-life bearing and screen-media resupply continue under the same roof.