Structural Features and Working Principle of High-Pressure Roller Mills

High-pressure roller mills are a new type of high-efficiency, energy-saving crushing equipment that emerged in the mid-1980s. Initially, due to limitations in roller surface wear resistance technology, they were primarily used in the cement industry. With the increasing maturity of key technologies such as alloy pin roll surfaces, hydraulic coupling transmission, and universal joint shaft roll shaft direct connection, it has been successfully applied in domestic and international metal mines, particularly iron mines, for crushing metal ores of medium to high hardness.

High-pressure roller mills offer advantages such as high processing capacity, fine product particle size, high crushing efficiency, and high equipment operational rates, making them an ideal choice for fine and ultra-fine crushing of iron ore.

Structural Features and Working Principle of High-Pressure Roller Mills

High-pressure roller mills are similar to double-roll crushers in that they both have two working rolls, but their crushing principles are entirely different. The high-pressure roller mill consists of a frame, high-pressure working rollers, a hydraulic system, and a feeding system. The working components of the high-pressure roller mill are a pair of parallel, counter-rotating high-pressure rollers. Each roller is driven by an electric motor through a planetary gear reducer. The fixed roller is stationary, while the moving roller can move along a horizontal slideway. The hydraulic system on the sliding roller shaft applies extremely high working pressure (up to 300 MPa) to the working roller surface.

The working principle of the high-pressure roller mill is layer compression grinding, first proposed by Professor Schuna of Germany in the late 1970s, and has since become the guiding principle for the development and renovation of energy-saving grinding equipment. When the high-pressure roller mill is in operation, the feed material enters the crushing chamber between the two rollers of the high-pressure roller mill through a feed hopper with an adjustable opening size, achieving full feeding. Under the combined effects of the feed material's own weight and the counter-rotating motion of the two pressure rollers, the feed material is forcibly squeezed into the continuously compressing crushing chamber and compacted. When a certain pressure is reached, the material is crushed, ultimately forming a dense yet highly fractured flake-like product that is discharged. The product contains a large number of fine particles, micro-fine particles, and micro-fractures within the particles, resulting in very low mechanical strength. This indirectly enhances the mill's processing capacity and grinding efficiency.

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