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Grizzly FeedersGlobal Supplier & Manufacturer of Mineral Processing Solutions
Primary crusher performance depends directly on what goes into it — and how much of what goes in actually needs to be crushed. The Grizzly Feeder addresses both variables: it controls the rate of material delivery to the crusher, and it pre-screens the feed to divert undersized particles before they consume crusher capacity unnecessarily.
Product Features
- Grizzly bars pre-screen feed material, diverting fines and undersized particles before the crusher
- Adjustable bar spacing (typically 70 – 160 mm gap) — configured to your material and circuit specification
- Choice of bar type: finger tines, fabricated grizzly bars, or lined pan section depending on material characteristics
- Under-grizzly screen media section can be added for additional classification at the feed stage
- Abrasion-resistant pan and side liners protect the feeder structure in abrasive feed conditions
- Oil-lubricated twin-row spherical roller bearings — designed for continuous heavy-duty operation
- Adjustable timing angles accommodate varying material characteristics and applications
- Frequency inverter for precise, adjustable feed rate control — maintains optimal primary crusher loading
Metric
Imperial
Technical Parameter Table
|
Model
|
Deck
|
Grizzly Length (m) | W x L (mm x mm) | Maximum Feed Size (mm) | Motor Power (kW) | Capacity (mtph) |
|---|---|---|---|---|---|---|
| GF4012 | 1 | 1.2 | 1,000 x 3,660 | 600 | 15 | 450 |
| GF4016 | 1 | 1.8 | 1,000 x 4,875 | 600 | 18.5 | 500 |
| GF4616 | 1 | 1.8 | 1,124 x 4,875 | 700 | 18.5 | 550 |
| GF4620 | 1 or 2 | 1.2 | 1,124 x 6,070 | 700 | 22 | 550 |
| GF5217 | 1 | 1.8 | 1,300 x 5,220 | 800 | 30 | 620 |
| GF5220 | 1 or 2 | 1.2 | 1,300 x 6,070 | 800 | 30 | 620 |
| GF5224 | 1 or 2 | 1.2 | 1,300 x 7,320 | 800 | 37 | 620 |
| GF5820 | 1 or 2 | 1.2 | 1,470 x 6,070 | 900 | 37 | 700 |
| GF5824 | 1 or 2 | 1.5 | 1,470 x 7,320 | 900 | 45 | 700 |
| GF6420 | 1 or 2 | 1.2 | 1,630 x 6,070 | 1,100 | 45 | 820 |
| GF6424 | 1 or 2 | 1.5 | 1,630 x 7,320 | 1,100 | 45 | 820 |
| GF7220 | 1 or 2 | 1.6 | 1,830 x 6,070 | 1,300 | 55 | 1,250 |
| GF7224 | 1 or 2 | 1.5 | 1,830 x 7,320 | 1,300 | 75 | 1,250 |
Related Projects
Frequently Asked Questions
What is the purpose of the grizzly bar section?
The grizzly bars act as a pre-screen at the feed stage, allowing undersized material to pass through and bypass the crusher entirely. This protects the crusher from unnecessary load, reduces wear on crushing surfaces, and improves overall circuit efficiency by ensuring only material that actually needs crushing enters the crusher chamber.
How is bar gap configured, and can it be changed in service?
Bar gap is set during the engineering phase based on your material specification and the targeted bypass size. The typical range is 70 to 160 mm. For applications where process conditions vary, adjustable configurations are available. Contact us to discuss your material and we will confirm the appropriate gap specification.
What bar types are available, and how do I know which is right for my application?
Three configurations are available: cast grizzly bars, fabricated grizzly bars, and finger tines. The right choice depends on your material characteristics — particle size distribution, abrasiveness, clay content, and moisture levels. We specify the bar type as part of the equipment engineering process, not as an aftermarket selection.
What are the benefits of adding an under-grizzly screen section?
An under-grizzly screen section serves two distinct applications. In aggregate plants, it removes natural fines and dirt from the bypass stream before they can contaminate clean crushed aggregate further down the circuit. In crushing circuits, it removes fines ahead of the secondary crusher — reducing the prescreening load that would otherwise be required downstream. The under-grizzly screen section must be specified before the feeder is manufactured. Contact us to discuss your circuit and materials, and we can advise on whether it’s the right fit for your application.
What bearing arrangement does the Grizzly Feeder use?
Heavy-duty, oil-lubricated twin-row spherical roller bearings, specifically engineered to withstand the rigorous shock loads and continuous high-vibration environment of primary feeding applications.
Who do I contact to discuss whether the Grizzly Feeder is right for my application?
Contact your regional AMPCO Minerals sales representative or reach out through our website. We will ask about your material, feed size, throughput requirements, and site conditions — and give you a direct assessment of whether this feeder fits your circuit.
