A Raymond Mill (also known as a Raymond Roller Mill) is widely used for grinding non-flammable and non-explosive materials with Mohs hardness below 7 and humidity less than 6%. It is commonly used in mining, construction, chemical, and metallurgical industries.
Detailed Structure of Raymond Mill
The main components of a Raymond mill include:
# 1. Main Frame (Base Structure)
– The sturdy base supports the entire mill structure.
– Made of high-quality cast steel for durability.
– Houses the transmission system and grinding rollers.
# 2. Grinding Roller Assembly
– Consists of multiple grinding rollers (usually 3 to 5) that rotate around a central axis.
– The rollers apply pressure to the grinding ring to crush materials.
– Equipped with springs to adjust grinding pressure.
# 3. Grinding Ring (Grinding Bowl)
– Fixed on the main frame, it rotates along with the roller assembly.
– The material is ground between the rollers and the ring.
– Made of wear-resistant alloy steel for longevity.
# 4. Classifier (Separator)
– Adjusts fineness by controlling airflow and particle size.
– Rejects coarse particles back into the grinding chamber for further milling.
– Uses a rotating impeller or static blades for classification.
# 5. Air Blower (Fan)
– Provides airflow to carry fine powder from the grinding chamber to the cyclone collector.
– Adjustable speed controls product fineness.
# 6. Cyclone Collector & Dust Collector (Bag Filter)
– Separates fine powder from air after milling.
– Cyclone collector removes most particles, while bag filters capture remaining dust for environmental compliance.
# 7. Powder Discharge System
– Screw conveyor or rotar
alve discharges final product into storage or packaging units.
# 8. Reducer (Gearbox) & Motor
– Reduces motor speed to optimal grinding rotation speed (~100-300 RPM).
– Ensures smooth operation and energy efficiency.
Working Principle:
1. Material is fed into the mill through a feeder.
2. The grinding rollers crush the material against the rotating ring under centrifugal force.
3. Ground powder is carried by airflow to the classifier, where oversized particles are rejected back for regrinding.
4. Fine powder passes through the cyclone collector and bag filter before being discharged as final product
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