COFCO Engineering Equipment (Zhangjiakou) Co., Ltd. is one of the most reliable manufacturers and suppliers of bran grinding machine in China. With abundant experience, we warmly welcome you to buy durable bran grinding machine in stock here from our factory. We also accept customized orders.
The bran grinding machine is a heavy-duty impact reduction unit engineered for commercial flour milling plants to re-grind wheat bran, recover residual endosperm, and increase overall extraction rates by 1.5% to 3.5%. Operating on a high-speed rotor and precision screen configuration, the machine fractures flaky bran particles into fine flour fractions while separating fibrous components, directly maximizing endosperm yield without compromising finished flour ash content standards.
Technical Specifications
|
Parameter |
Specification Range / Description |
|
Capacity |
3.0 – 12.0 t/h |
|
Motor Power |
22 – 55 kW |
|
Rotor Speed |
2200 – 2800 RPM |
|
Screen Aperture |
0.4 – 1.2 mm |
|
Approximate Weight |
680 – 1320 kg |
|
Housing Construction |
Heavy-gauge welded carbon steel designed to eliminate dynamic vibration |
|
Rotor & Hammers |
Dynamically balanced alloy steel rotor fitted with four-edge reversible, case-hardened hammers (HRC 58–62) |
|
Drive & Control |
Direct coupling via IP55 industrial motors; equipped with vibration sensors, bearing temperature probes, and pneumatic feed gates compatible with plant DCS architecture |
Performance Advantages
Yield Maximization
High-velocity impact geometry releases endosperm tightly bound to the inner bran coat, boosting total mill output efficiently.
Extended Component Lifespan
High-chromium alloy hammers feature four reversible working edges, quadrupling service intervals and reducing replacement frequency.
Thermal Protection
Integrated air aspiration channels maintain low internal working temperatures during grinding, preventing starch gelatinization and product caking.
Rapid Maintenance
Cantilevered housing and slide-out screen tracks allow operators to inspect or replace perforated sizing screens in under 15 minutes.
Industrial Applications
Positioned downstream of reduction roller mills or bran finishers to process coarse bran fractions and extract remaining endosperm.
Utilized for secondary reduction of semolina tailings to maintain strict particle size distribution and minimize fine flour generation.
De-structuring fibrous grain by-products to increase surface area, improve digestibility, and prepare raw materials for subsequent processing.
Working Principle
Material Feeding
Coarse bran enters the top inlet through a controlled magnetic feeder, ensuring a uniform, continuous volumetric feed rate into the grinding chamber.
Impact & Reduction
High-speed rotating hammers strike the material against serrated impact liners, shattering fibrous structures and detaching adherent flour particles through intense mechanical shear forces.
Classification & Discharge
Pulverized material is forced against precision-drilled peripheral screens. Particles smaller than the aperture pass through to the discharge hopper, while oversized fiber fractions are retained for further internal attrition.
Installation and Maintenance
Foundation Requirements
Mount on a rigid, level concrete floor or structural steel mezzanine using heavy-duty anti-vibration rubber mounts to isolate dynamic loads.
Utility Connections
Requires a 3-phase industrial power supply and connection to the central plant aspiration network (minimum negative pressure: 1.5 kPa) for dust control and cooling airflow.
Routine Maintenance Schedule
Daily: Check main bearing temperatures, inspect feed regulators, and monitor motor amperage draw.
Weekly: Inspect hammer tip wear, check rotor dynamic balance, and clean internal screen apertures.
Monthly: Grease spherical roller bearings with high-temperature lithium-complex grease and check drive belt tension.
Production Line Integration
Installed downstream of the final reduction sifter on the bran circuit, receiving coarse fractions directly from the bran duster or last reduction passages.
Integrated with a dedicated cyclone separator and airlock valve to separate ground flour from conveying air, routing the purified product back to the main grading sifter.
Linked to the primary mill emergency shut-down loop; the feed gate closes automatically upon sudden motor overload or main drive trip.
Packaging and Delivery
Export Packaging
Secured inside fumigation-free wooden crates lined with moisture-barrier vacuum foil and desiccants to prevent corrosion during ocean transit.
Component Protection
Machined surfaces, shafts, and internal wear parts coated with heavy-duty rust-preventative compound; critical electrical panels packaged in sealed, shock-absorbent enclosures.
Logistics & Documentation
Shipped via standard 20-foot or 40-foot containers; accompanied by comprehensive mechanical drawings, electrical schematics, English operation manuals, and material inspection certificates.
Frequently Asked Questions
Q: How does bran grinding affect finished flour ash content?
A: When operated with correctly sized screens and calibrated impact speed, the machine liberates pure endosperm without fracturing the mineral-rich outer pericarp, keeping finished ash content within contract specifications.
Q: What is the typical lifespan of the grinding hammers?
A: Under continuous operation processing standard wheat bran, high-chromium alloy hammers deliver 1,200 to 1,800 operating hours per working edge, yielding up to 7,200 hours of total service across all four edges.
Q: Can the machine handle high-moisture bran streams?
A: Feed material moisture content should be maintained below 14.5%. Processing higher moisture levels risks blinding the screen perforations and reducing throughput efficiency.
Q: What adjustments are required to change output fineness?
A: Output particle size is adjusted primarily by changing the perforated screen aperture size (0.4 mm to 1.2 mm) and fine-tuning the rotor tip speed via a frequency inverter.
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