COFCO Engineering Equipment (Zhangjiakou) Co., Ltd. is one of the most reliable manufacturers and suppliers of high-capacity grain destoner in China. With abundant experience, we warmly welcome you to buy durable high-capacity grain destoner in stock here from our factory. We also accept customized orders.
Engineered for continuous commercial milling, this gravity-separation machine utilizes dual-action aerodynamic fluidization and mechanical vibration to extract high-density stones, glass, and metal particles from cereal grains like wheat and corn, protecting downstream rollers from heavy wear.
Operating Mechanics
Fluidized Bed Stratification: Oscillating sieve decks combine with upward laminar airflow to lift lighter grains into suspension while heavier stones sink to the screen deck.
Counter-Flow Drive Action: Dual eccentric shafts impart linear reciprocating force, driving separated stones upward against material flow toward the heavy impurity outlet.
Static Air Regulation: Multi-section dampers adjust under-deck static pressure to match specific kernel densities and moisture contents.
Enclosed Dust Extraction: Suction hoods capture airborne chaff and light bran through a centralized negative-pressure duct network.
Technical Specifications
|
Parameter |
Specification Data |
|
Throughput Capacity |
10 to 35 t/h |
|
Installed Motor Power |
2.2 to 5.5 kW |
|
Air Volume Requirement |
8,000 to 23,000 m3/h |
|
Sifting Screen Area |
1.45 to 4.10 m2 |
|
Equipment Dimensions |
2450 * 1420 * 1780 to 3250 * 2100 * 1900 mm |
|
Gross Equipment Weight |
1,650 to 3,400 kg |
|
Housing Construction |
Q235B structural carbon steel |
|
Screen Material |
304 stainless steel woven mesh |
|
Drive Configuration |
Dual-shaft vibratory motors with spherical roller bearings |
|
Deck Inclination Range |
Mechanically adjustable from 4° to 8° |
Engineering Advantages
Synchronized Linear Drive:
Counter-rotating vibratory motors eliminate lateral deflection, producing purely linear deck acceleration to prevent material pooling.
Bypass-Resistant Mesh:
Multi-layer aperture configurations resist blinding, secured by quick-release clamping levers for tool-free screen swaps.
Laminar Plenum Design:
Internal baffling plates eliminate turbulence dead zones to ensure uniform fluidization across the entire separation surface.
Vibration Isolation:
High-durometer rubber spring isolators absorb over 95% of dynamic loads, protecting building structures from harmonic resonance.
Target Applications
Commercial Flour Mills: Integrated into primary cleaning houses ahead of dampening bins and reduction roller mills.
Maize Processing Lines: Installed in germ-separation circuits to extract mineral impurities from whole or cracked corn.
Grain Elevators: Deployed as high-throughput receiving cleaners to safeguard bulk storage silos and conveyors.
Seed Grading Plants: Delivers high-purity separation by removing heavy weed seeds and sand aggregates from harvested crops.
Installation Parameters
Structural Base: Mount on a reinforced concrete floor rated for 1.5 x static equipment weight using anchor bolts and vibration pads.
Aspiration Ducting: Connect exhaust ports to a central network maintaining a minimum static pressure of -1200 Pa.
Electrical Interlock: Wire vibratory motors through an overload-protected MCC interlinked with upstream feeders to prevent dry runs.
Level Alignment: Verify a 0° lateral frame tilt using precision spirit levels along both channels before final torqueing.
Quality Assurance
Plate Verification: Ultrasonic thickness testing and spectroscopic elemental analysis confirm carbon and stainless steel integrity.
Dimensional Tolerances: Laser-cutting accuracy maintained within ±0.1mm for exact alignment of drive shafts and screen assemblies.
Dynamic Factory Testing: Fully assembled decks undergo 4-hour continuous run-tests to verify vibration amplitude and bearing stability.
Weld Inspection: All load-bearing structural welds undergo 100% visual and magnetic particle testing (MT).
Packaging & Logistics
Sealed in heat-treated solid wood crates complying with ISPM 15 standards, lined with multi-layer VCI anti-corrosion film and desiccants.
Internal bracing blocks secure the suspended sieve deck to prevent transit damage to rubber springs and bearings.
Crates include English installation manuals, electrical schematics, spare parts catalogs, and factory inspection certificates.
Frequently Asked Questions
Q: What is the typical stone removal efficiency?
A: Achieves a removal rate exceeding 99% for heavy mineral impurities matching target grain dimensions.
Q: How often do wire mesh screens require replacement?
A: Under continuous 24/7 operation, 304 stainless steel mesh maintains integrity for 12 to 18 months based on grain abrasiveness.
Q: Can air volume be adjusted for different crops?
A: Yes, external slide-gate dampers allow manual aspiration adjustment when switching between lighter grains like wheat and heavier crops like corn.
Q: What routine maintenance is required for the drive system?
A: Grease bearings every 500 operating hours using high-temperature industrial lithium lubricant, and inspect belt tension monthly.
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