Hanging roller refiner also known as Raymond mill, which belongs to the disk fixed disk grinding machine. Currently, China's production of 3-high, 4-roll and 5 roll refiner, and 4-roll is the most commonly used. Raymond mill, Raymond mill, English name: Raymond mill. It applies to all kinds of fine ore preparation, pulverized coal preparation, ore, gypsum, coal and other materials such as raw meal powder processing. Raymond mill, Raymond mill, high performance Raymond mill, high pressure Rotary roller mill