Vibrating Rock Feeder (Grizzly Feeder)

A vibrating rock feeder (grizzly feeder) is a heavy-duty machine that feeds run-of-mine (ROM) rock to the primary jaw or impact crusher in a steady, controlled flow, while its grizzly by-pass section separates fines and soil before they reach the crusher. Built by General Makina, it is driven by a vibromotor or an eccentric belt-and-pulley drive, handles feed sizes up to 1500 mm and works at 75-600 tph.

How it works

A loader, truck or excavator dumps ROM material into the hopper. The vibrating trough, mounted on heavy-duty helical springs, moves material forward with a linear/circular vibration. The grizzly section at the trough end performs two functions:

• By-pass (pre-scalping): fines and soil pass through the grizzly bars and bypass the crusher straight to the conveyor/screen, so the crusher is not loaded unnecessarily.
• Steady feeding: oversize rock is metered over the bars into the crusher mouth, maintaining a choke-feed regime that improves crusher efficiency and cubical particle shape.

Role in the plant

The feeder is the plant's first link: regulated feeding plus pre-scalping/by-pass. The by-pass keeps fines and soil away from the primary crusher, reducing jaw/impact liner wear (a direct effect on cost per ton), raising capacity and cutting wasted crushing energy. Continuous, non-intermittent feeding gives a more stable crusher output.

Technical specifications

Common features: 15-100 m³ hopper capacity, maximum feed size 1500 mm, reinforced steel construction, heavy-duty helical springs, bolted replaceable body wear liners and abrasion-resistant by-pass grizzly bars.

Applications and material

Ideal for hard/abrasive quarry rock (granite, basalt), limestone and dry to medium-moisture ROM. With high-moisture or sticky (clayey) material there is a blinding/pegging risk on the grizzly; in that case a Wobbler feeder is preferred. Suited to fixed and mobile primary plant intakes, mining, aggregate and recycling sites.

Complete plant solution

General Makina supplies the feeder together with the primary jaw/impact crusher, grizzly screen, belt conveyor and concrete batching plant from a single supplier. The feeder can be engineered as one integrated project with the full crushing-screening-washing line — one point of contact, one accountable party and a matched spare-parts chain (wear grizzly bars / body plates).