1. PAINPOINT DRIVEN OPENING

Are escalating operational costs and unpredictable downtime eroding your sand and gravel operation's profitability? Common industry challenges directly impact your bottom line: inconsistent feed material causing frequent plant blockages and unplanned stops; excessive wear on crusher liners and screen cloths from abrasive, unscreened oversize; high energy consumption from processing alreadytospec material; and the significant labor cost of manual clearing and presorting. These issues translate to lost production hours, premature component replacement, and inefficient fuel or power use.

What if you could systematically remove these bottlenecks before they reach your primary processing circuit? How would a 1520% reduction in crusher liner wear change your annual maintenance budget? The solution lies in effective, highcapacity primary screening—the critical first line of defense for any efficient operation.

2. PRODUCT OVERVIEW

The HeavyDuty Grizzly Feeder is a rugged, primary scalping unit designed to handle the initial size separation of runofquarry (ROQ) sand, gravel, and shot rock. It operates as a robust filter at the very front end of your material handling system.

Operational Workflow:
1. Dump & Feed: ROM material is dumped directly onto the feeder’s heavyduty deck from haul trucks or loaders.
2. Vibratory Separation: An aggressive linear vibration moves material forward while allowing subdecksize particles to fall through the grizzly bars.
3. Scalping & Routing: Undersize material (typically sand, fines, and small gravel) passes through the grizzly openings onto an underlying conveyor for direct bypass to secondary circuits or stockpiling.
4. Oversize Conveyance: Oversize rocks (e.g., +6”, +8”) are carried over the bars and discharged into the primary crusher.
5. Protection: The unit absorbs the impact of large rocks, protecting downstream conveyors and crushers from direct shock loading.

Application Scope: Ideal for hightonnage quarry face applications, river dredge feed points, and alluvial deposit operations where feed size is highly variable.
Limitations: Not designed for fine screening or sorting; bar spacing is fixed or mechanically adjustable within a set range. Optimal performance requires controlled feed rates to prevent blinding of the grizzly deck.

3. CORE FEATURES

HeavyDuty Deck Construction | Technical Basis: Highstrength, abrasionresistant steel alloy bars with reinforced support frames | Operational Benefit: Withstands direct impact from large rock (up to 48”+) and continuous abrasion without deformation | ROI Impact: Reduces structural repair costs by up to 40% over standard decks, extending service life beyond 5 years in severe duty.

Adjustable Grizzly Bar Section | Technical Basis: Modular section with manually or hydraulically adjustable bar spacing | Operational Benefit: Allows operators to change scalp size (e.g., from 4” to 8”) in under 30 minutes to match deposit changes or product specs | ROI Impact: Maximizes bypass of spec material, increasing plant throughput by 1025% by relieving the primary crusher.

Dual Mass Vibratory Drive System | Technical Basis: Springcoupled system where one mass cancels out dynamic forces on the structure | Operational Benefit: Generates highstroke linear motion for positive material movement even with sticky clays; reduces transmitted forces to the support structure by up to 95% | ROI Impact: Lowers foundation costs by up to 50% and reduces energy consumption per ton by approximately 1520%.

BoltIn Replaceable Wear Components | Technical Basis: Modular wear shoes, deck liners, and grizzly bars secured with hardened bolts | Operational Benefit: Enables rapid component replacement during scheduled maintenance without major welding or cutting | ROI Impact: Cuts downtime for wear part replacement from shifts to hours, improving plant availability.

Variable Speed Drive Control | Technical Basis: Frequency inverter controlling vibratory motor speed | Operational Benefit: Allows finetuning of feed rate and stroke effectiveness for different moisture content and gradations in realtime | ROI Impact: Optimizes crusher cavity level for maximum reduction efficiency, reducing power spikes and improving overall circuit stability.

Integrated Hopper & Apron Section | Technical Basis: Fabricated hopper with bolton apron plates at the feed point | Operational Benefit: Contains surge loads from truck dumping and provides a controlled feed onto the vibrating deck | ROI Impact: Eliminates spillage at the feed point and protects dump truck beds from direct impact with grizzly bars.

4. COMPETITIVE ADVANTAGES

| Performance Metric | Industry Standard | HeavyDuty Grizzly Feeder Solution | Advantage (% improvement) |
|||||
| Deck Plate Wear Life | 612 months in abrasive applications | 1824 months with AR400 liners | +100% wear life |
| Throughput Capacity | Subject to frequent bridging/blinding | Highstroke vibration prevents packing | +30% consistent feed rate |
| Energy Consumption | Fixed speed drives running continuously | Variable Frequency Drive (VFD) optimization| 18% average power draw |
| Maintenance Downtime | Fullday shutdowns for weld repair | Boltin component replacement |75% component swap time |
| Crusher Liner Wear | Direct impact from fines & abrasives | Removal of 80mm fines before crushing |20% on primary mantle/concaves |

5. TECHNICAL SPECIFICATIONS

Capacity Range: Model dependent, from 500 TPH to over 2,500 TPH of sand & gravel.
Power Requirements: Electric vibrator motors ranging from 30 HP to 100 HP, typically operating on 480V/3phase/60Hz power.
Material Specifications: Main frame ASTM A36 steel; Deck & Grizzly Bars AR400 / Hardox 400 abrasionresistant steel; Liners Boltin AR500 sections.
Physical Dimensions (Typical Model): Length (feed hopper to discharge): ~20 ft; Width (over deck): ~8 ft; Height (underframe): ~6 ft; Weight: ~25,000 lbs.
Environmental Operating Range: Designed for ambient temperatures from 20°C to +50°C (4°F to +122°F). Dust seals are standard; optional spray bars available for highmoisture applications.

6. APPLICATION SCENARIOS

Alluvial Sand & Gravel Pit

Challenge A pit feeding both concrete sand and drainage gravel faced constant plugging at the jaw crusher due to high clay content in wet months, halting production for manual clearing twice per shift.
Solution Installation of a heavyduty grizzly feeder with a VFDcontrolled highamplitude stroke was implemented ahead of the jaw crusher.
Results The aggressive action broke apart clay balls while scalping off oversize cobbles. Crusher plugging incidents dropped by over 90%, increasing effective daily throughput by an average of 180 tons per operating day.

Granite Quarry Processing Shot Rock

Challenge Excessive fines (4") in shot rock were causing rapid wear on cone crusher liners and consuming unnecessary crushing energy while also degrading final product shape.
Solution A twostage grizzly feeder was deployed—a fixedbar section at 8" followed by an adjustablebar section set at 4".
Results Approximately 22% of total feed (the 4"x0" material) was bypassed directly to a tertiary circuit conveyor. This reduced load on the primary cone crusher by over onefifth, extending liner life by an estimated three weeks per set and lowering specific energy consumption.

7. COMMERCIAL CONSIDERATIONS

Pricing Tiers: Units are configured based on size/capacity:
Standard Duty (2000 TPH): Includes full Hardox lining, hydraulic bar adjustment,and premium vibrator drives for severeservice mines.

Optional Features: Hydraulic bar spacing adjustment module; integrated metal detection system; automated lubrication system; customdesigned skid bases or trailer mounts for semiportability; dust encapsulation covers.

Service Packages: Threetiered offerings:
1. Basic Warranty covering parts/labor for one year.
2. Extended Protection Plan covering all major structural components plus annual vibration analysis inspection.
3. FullService Agreement including scheduled wear part replacements based on monitored tonnage data.

Financing Options Available through our partners include equipment leasing programs that allow payments out of operational cash flow,tradein valuation services,and projectspecific financing.

8.FAQ

Q What is required under this equipment?
A A level concrete foundation pad designedto absorb static loads is standard.Field data shows that our dualmass drive system minimizes dynamic forces,but proper anchoring is critical.We provide full foundation drawingswith purchase

Q Can it handle extremely wet or sticky material?
A Yes.The combinationof an aggressive linear strokeand optional deck heating systemsor polyurethanecoated barscan mitigate sticking.Variable speed control allows operators totune themotionfor optimalmaterial flowin changing conditions

Q How does this integratewith my existingprimarycrusherand conveyor system?
A Our engineering team will reviewyour plant layoutto ensureproper interfacingfor height discharge angleand chutework We designfor seamless transferpoints tomaximize flowand minimize spillage

Q Whatis therealistic payback periodon this investment?
A Basedon documented case studiesin similar operations paybackis typically achievedwithin1218 monthsthrough gainsin throughput reducedcrusherwearand lowerdowntime Your specific geologyand product mixwill determineexact figures

Q Arewearparts readily available?
A Yes All criticalwearcomponentsare standardizedstock itemsin our globalnetworkof distribution centers Guaranteedavailabilityis partof ourextendedservice agreements

Q Do you offeronsiteoperator training?
A Yes Comprehensive trainingfor bothoperationsand maintenancecrews is includedwith installation We focuson safeoperation troubleshooting proceduresand daily inspection checklists