Vibrating Grizzly Feeder: Steady Primary Feeding with By-Pass Pre-Scalping

A crushing and screening plant's efficiency starts with how evenly material reaches the crusher. That is the job of the vibrating rock feeder (grizzly feeder): it delivers run-of-mine (ROM) rock to the primary jaw or impact crusher in a controlled, uninterrupted flow and, at the same time, its grizzly by-pass section removes fines and soil before they get to the crusher. Our feeders run on a vibromotor or an eccentric belt-and-pulley drive, accept material up to 1500 mm and offer capacities of 75-600 tph.

How Does the Feeder Work?

ROM material is tipped into the hopper by a loader, truck or excavator. The vibrating trough, resting on helical springs, walks the material forward with a linear or circular vibration. The grizzly section at the end of the trough then has two tasks:

• Pre-scalping via by-pass: fines and soil drop through the gaps between the bars and go to the conveyor or screen without ever entering the crusher, so the crusher carries no needless load.
• Even feeding: oversize rock travels over the bars into the crusher mouth at a constant rate, keeping the mouth full (choke-feed), which improves both crusher efficiency and the cubical shape of the particles.

Its Role in the Plant

The feeder is the first link in the line and does two jobs at once: regulated feeding and pre-scalping/by-pass. Because fines and soil are kept away from the primary crusher, jaw and impact liners wear more slowly (cutting total wear cost directly), capacity rises and crushing energy is no longer wasted. Continuous rather than intermittent feeding also makes the crusher output more stable.

Technical Data

Shared by every model: 15-100 m³ hopper volume, maximum feed size of 1500 mm, a steel body reinforced against vibration, heavy-duty helical springs, bolted and replaceable body wear plates and abrasion-resistant by-pass grizzly bars.

Which Material and Where?

It is the right choice for hard/abrasive quarry rock such as granite and basalt, for limestone and for dry or medium-moisture ROM. With high-moisture, sticky (clayey) material, the gaps between the bars may clog (blinding/pegging); a Wobbler feeder is better suited to such material. Typical uses are stationary and mobile primary plant intakes, mining, aggregate quarries and recycling sites.

An Integrated Plant Solution

We supply the feeder from a single source together with the primary jaw or impact crusher, grizzly screen, belt conveyor and concrete batching plant. The feeder can be designed as one project together with the complete crushing-screening-washing line: one point of contact, one responsible party and a matched spare-parts chain (wear grizzly bars, body plates).