COFCO Engineering Equipment (Zhangjiakou) Co., Ltd. is one of the most reliable manufacturers and suppliers of double-chamber grain destoner in China. With abundant experience, we warmly welcome you to buy durable double-chamber grain destoner in stock here from our factory. We also accept customized orders.
Designed for high-efficiency cleaning in grain processing and milling facilities, this industrial vibratory stone separator utilizes dual vibratory motors to isolate vibration forces, reducing structural dynamic loads by over 90 percent. It efficiently separates high-density impurities such as stones, heavy gravel, and metal particles from various grain streams to protect downstream processing equipment.
Technical Specifications
|
Parameter |
Standard Value / Range |
|
Capacity (Wheat/Corn) |
6 – 22 t/h |
|
Capacity (Paddy/Rice) |
4 – 16 t/h |
|
Destoning Efficiency |
≥ 99.5% |
|
Grain Loss in Stones |
≤ 0.01% |
|
Air Volume Requirement |
4,200 – 9,800 m3/h |
|
Static Pressure Drop |
600 – 850 Pa |
|
Deck Tilt Angle |
6° – 12° (Adjustable) |
Key Features & Construction
Polycarbonate Sight Glasses: Impact-resistant windows on each chamber allow real-time monitoring of fluidization performance.
Dynamic Balance Control: Motors and eccentric counterweights undergo balancing tests according to ISO 1940 standards before assembly.
Rigid Quality Welding: Load-bearing structural welds pass visual and liquid penetrant testing to prevent fatigue cracking.
Customization Options
Screen Mesh Configuration:
Perforated plates with round or triangle holes ranging from 1.2 mm to 4.5 mm tailored to grain size profiles.
Variable Frequency Drives:
Optional inverter packages for motor frequency adjustments from 30 Hz to 60 Hz.
Material Grade Selection:
Full SUS304 stainless steel construction or contact-parts-only stainless steel with epoxy coating.
Differential Pressure Sensors:
Digital transducers (4–20 mA output) installed inside air hoods for PLC airflow monitoring.
Typical Application Industries
Wheat Milling Pre-Cleaning: Extracts stones before grain washing or dampening to prevent roll surface pitting on break rolls.
Corn Processing Facilities: Removes heavy gravel from raw maize prior to degermination and grit milling.
Rice Hulling Systems: Separates small stones from brown rice and paddy streams to extend rubber roll life in huskers.
Pulse Cleaning Lines: Cleans lentils, chickpeas, and soybeans of matching field stones prior to splitting and polishing.
Installation Guidelines
Structural Base Preparation: Mount on a rigid concrete base or reinforced steel frame capable of supporting static and dynamic loads.
Aspiration Ductwork: Connect the top outlet flange to the central exhaust system using flexible, anti-static duct connectors.
Electrical Wiring: Wire dual vibratory motors through an overload circuit breaker; verify counter-rotating motion for linear stroke direction.
Calibration Run: Adjust air damper valves and screen inclination angles under full-load conditions to establish stable fluidization.
Quality Control & Factory Testing
Dynamic Balance Testing: Motors and eccentric counterweights undergo balancing tests according to ISO 1940 standards before assembly.
CNC Machining Precision: Screen plates and structural frame parts feature dimensional tolerances within $\pm 0.1 \text{ mm}$.
Weld Seam Inspection: Load-bearing structural welds pass visual and liquid penetrant testing to prevent fatigue cracking.
Factory Dry Run Test: Every unit undergoes a 4-hour continuous dry run to monitor bearing temperature, noise emission (under 80 dB), and vibration amplitude.
Packaging & Logistics
Internal polished surfaces receive food-grade rust preventive oil; external frames receive polyurethane industrial paint.
Units are secured on heavy-duty timber skids, enclosed in vacuum vapor bags, and encased in ISPM-15 plywood crates.
Equipment is anchored using steel wire rope slings inside 20ft or 40ft containers to eliminate transit movement.
Frequently Asked Questions
Q: How do I adjust air volume for different grain types?
A: Adjust the manual throttle valve on the top suction duct or change fan speed via VFD until the grain layer fluidizes without discharging through the stone outlet.
Q: What causes grain to discharge along with stones?
A: Grain in stone discharge typically results from insufficient airflow, excessive deck inclination, or worn screen meshes.
Q: How often should screen plates be inspected?
A: Inspect weekly for blinding or wear. Clean clogged perforations using wire brushes or compressed air nozzles.
Q: Can this unit operate without a central dust collector?
A: No, the equipment requires an external aspiration fan and filter system to provide constant negative pressure for fluidization.
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