A grizzly feeder is a robust, heavy-duty machine used in mining and aggregate industries to feed and separate raw materials before primary crushing. It consists of a vibrating feeder with a grizzly section (a set of parallel bars or grids) that removes fine material and bypasses larger rocks to the crusher.
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Key Features of a Mining Grizzly Feeder:
1. Grizzly Bars/Section
– Made of high-strength steel (often manganese or abrasion-resistant steel).
– Spacing between bars can be adjusted to control the size of material passing through.
2. Vibrating Mechanism
– Uses eccentric shafts, motors, or electromagnetic drives to create vibration.
– Helps evenly distribute material and prevent clogging.
3. Heavy-Duty Construction
– Designed to handle large rocks, high-impact loads, and abrasive materials.
– Often includes wear-resistant liners for durability.
4. Scalping Function
– Separates undersized material (fines) from oversized rocks before crushing, improving efficiency.
5. Adjustable Slope & Feed Rate
– Some models allow slope adjustment for better material flow control.
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Applications in Mining:
– Primary screening before jaw/gyratory crushers.
– Removing fines to reduce crusher load.
– Handling run-of-mine (ROM) ore in open-pit or underground mines.
– Used in quarrying, coal, iron ore, gold, and copper mining.
Advantages:
✔ Reduces wear on primary crushers by removing fines early.
✔ Improves processing efficiency by pre-screening material.
✔ Handles large feed sizes (up to several feet).
✔ Low maintenance compared to other feeding systems.
Types of Grizzly Feeders:
1. Static Grizzly – Fixed bars; no vibration (simpler but less efficient).
2. Vibrating Grizzly Feeder (VGF) – Motor-driven vibration for better flow control (most common in mining).
3. Chain & Apron Grizzly – Used for extremely heavy-duty applications (e.g., large boulders).
Manufacturers & Models:
– Terex® Simplicity Vibrating Grizzly Feeders
– Metso Nordberg® VF Series
– McLanahan Vibrating Grizzly Feeders
– Deister Machine Heavy-Duty Grizzlies
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