Vibration-Controlled (Adjustable Stroke) Screen

The vibration-controlled screen uses a triple-shaft drive to generate an adjustable oval (elliptical) stroke, with a capacity of 100-400 tph. The oval stroke axis and amplitude are easily tuned to the material being processed, so screen-aperture blinding and pegging are prevented and the recirculating load is kept low. The body is bolted and weld-free, and the screen media is easy to replace.

Triple-shaft oval stroke

The triple-shaft mechanism creates a controlled oval trajectory on the deck. Compared with plain circular or linear motion, the oval motion's advantage is that stroke angle and amplitude are adjustable:

• For near-size particles (75-125% of the aperture), the oval motion turns the grain out of the aperture and reduces blinding.
• On slightly damp material it breaks adhesion and preserves the effective aperture.
• Stroke adjustment lets the same screen be optimised for different materials and gradations.

Hardware figures

Capacity depends on material gradation, moisture and whether the screen runs wet. Apertures and media type are set to order for each project; commercial screening efficiency is on the order of 90-95%.

Fields of use

The vibration-controlled screen suits materials with a high blinding risk: near-size-heavy feed, slightly damp aggregate, sand-and-gravel classification, and fixed plants where high efficiency is required. The adjustable stroke keeps the screen efficient even through seasonal moisture changes. In the fine range it can be paired with a fine material screen.

Factory integration

At General Makina the vibration-controlled screen is treated as one element of the whole plant from the engineering stage. The adjustable-stroke unit is combined with the feeder, crusher group and wash-and-screen stages under a shared automation and spare-parts logic — responsibility stays in one hand from engineering through commissioning.