BBN450
YZH
Product Description
Grizzly feeders are designed to scalp off oversize before crushing, but in real operations boulders and flat rocks frequently bridge across the bars, starving the crusher and forcing dangerous manual clearing. A static pedestal boom system is mounted over or beside the grizzly so the breaker can knock down, split and rake those troublesome rocks, converting the feeder from a recurring bottleneck into a controlled oversize‑management station.
Because the boom is static—fixed to a pedestal with engineered foundations—it can be built with the strength and reach needed for harsh grizzly duty, where in‑line and side raking loads are high.
Bridged and lodged rocks on top of the bars
Large, uncrushable or slabby rocks often sit across openings, creating an arch that stops smaller material from passing.
The pedestal boom places the breaker on these pieces and then rakes fragments across the bars, restoring a clear deck and uniform flow.
Dangerous manual bar work and loader pushing
Without a fixed boom, crews may walk on the grizzly with bars or push from above with a loader, both of which are high‑risk practices.
With static pedestal booms and remote operation, rockbreaking and raking are done from protected locations, greatly reducing exposure to rolling rocks and sudden collapses.
Irregular, stop‑start feed to the crusher
When a grizzly runs in a pattern of blocking and sudden release, the downstream crusher sees surges and starvation cycles that increase wear and energy use.
By clearing bars quickly and keeping the top surface free of bridges, the boom system helps the feeder deliver a more constant feed, improving crusher utilization.
YZH’s technical notes on pedestal boom systems describe four core components, all crucial at the grizzly feeder:
Pedestal base
A heavy round or square pedestal is anchored to a concrete pad or structural steel near the grizzly, providing a rigid foundation for the boom.
Hydraulic boom
A multi‑section boom with wide cross sections, extra‑large pins and reinforced high‑tensile plates is designed to withstand high in‑line and side raking forces typical of grizzly applications.
Hydraulic breaker (rock hammer)
A suitably sized hydraulic breaker is mounted at the boom tip, delivering controlled blows to fracture oversize material sitting on the bars.
Hydraulic power unit and control system
An electric‑hydraulic power pack supplies oil flow and pressure to boom and breaker, and a control system—local or remote—gives the operator smooth, precise control.
YZH’s BC630 pedestal rockbreaker boom system illustrates typical performance for grizzly feeder duties:
Boom weight (without hammer): approx. 6,820 kg
Max. horizontal working radius (R1): 9,210 mm
Max. vertical working radius (R2): 6,930 mm
Min. vertical working radius (R3): 2,780 mm
Max. working depth (H2): 5,740 mm
Rotation: 170°
Pedestal size: Φ1680 × 1975 mm
Compatible hammer models: YZH1350–YZH1400
Power of hydraulic power unit: 55/75 kW
These figures show that one static boom can cover the full width and length of a large grizzly feeder, as well as part of the rockbox, without moving the pedestal.
Static pedestal boom systems engineered as grizzly feeder companions are used in:
Quarries, aggregate plants and mines where heavy-duty vibrating grizzlies separate oversize before primary crushing.
Underground or surface grizzly installations where oversize can block ore passes and must be reduced safely.
Key benefits documented in YZH and industry material include:
Increased feeder uptime and smoother crusher feed due to faster clearing.
Reduced manual labour and lower risk of injuries associated with working on or near the bars.
Long service life under harsh grizzly loads thanks to robust boom and pedestal design.
If your grizzly feeder still suffers from repeated bridging, unsafe bar work and irregular feed to the crusher, a YZH static pedestal boom system can act as its essential clearing companion.
Share your grizzly size, layout, feed characteristics and production targets, and YZH will configure a static pedestal boom solution—such as a BC630‑class system—with the reach, breaker size and power tailored to your feeder.
