ROSTA suspension elements don't fail catastrophically

The most expensive cost is unpredictable downtime. Coil springs and ROSTA suspension elements are wear items with one significant difference. ROSTA suspension elements wear out, and the rubber elements slump and compress over time but keep shaking with less performance. This allows operators to act proactively and change the ROSTA suspension elements in planned service downtime. On the other side, coil springs tend to burst and break without notice, shutting down your processing operation.

Why do coil springs fail?

Coil springs are cost-effective for building screen boxes and feeders but can fail without notice. This is primarily due to material fatigue due to the flexing movement. The coil spring’s top and bottom are fixed while the middle part flexes aggressively, which becomes a natural weak point.

The resonance frequency adds stress to frames.

The resonance frequency stresses the springs, frame, and welding spots during the start-up and shutdown of screen boxes and feeders. It causes the screen-box or hopper to shake violently. Some manufacturers have tried various solutions for a smooth start that are merely a band-aid to the problem rather than solving it profoundly. ROSTA suspension elements don't experience the same resonance frequency vibrations, which extends the service life of feeders, screen-boxes, and the suspension elements themselves.

How do ROSTA suspension elements work?

ROSTA suspension elements hop the material forward and don't wobble in every direction. It consists out of an outer housing that contains an inner square surrounded by four rubber cords. According to ROSTA, the high-performance elastomer rubber compound at its core is a special secret ingredient.

Benefits of ROSTA suspension elements over traditional coil springs

➕ strong directional forward pitch

➕ no violent shaking during during start-up/shut-down

➕ longer service life

➕ predictable downtime

➕ better corosion resistance

➕ feeder/screen-box don't need to be secured for hopping out of (coil) springs during transport or resonance frequency

➖ significant higher costs

➖ sensitive to side movements