Vertical roller mill development history in China

02/03/2015 Distance Learning Courses

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In cement production, usually adopts the traditional ball mill as cement raw meal grinding system, however, when the vertical roller mill , it features a strong production capacity and energy-saving widely admired. Especially after the improved technique of vertical mill, compared with a ball mill has incomparable advantage.

The mill can be efficiently integrated complete material crushing, grinding, drying, powder separating and conveying process, integrates many functions, has the advantages of simple process flow, stand-alone capacity big, expected to have a large size, drying capacity, good sealing performance, negative pressure operation, no dust on the finished product quality control, product replacement fast and flexible advantages, therefore, has been widely used in the world, has become the preferred equipment for industrial milling.

Extrusion grinding pressure and vertical mill are using hydraulic generated will be crushing material, but the two structure and grinding media of each are not identical. Extrusion mill is a horizontal structure, two extrusion axis are parallel with the ground, the material is crushed by the two squeeze rollers at minimum clearance, vertical mill is a vertical structure, driven by the driving device and disc grinding roller surface and the rotation, material was crushed in the grinding roller and the grinding disc. For the hydraulic system pressure is high, so the complex structure, high manufacturing precision, large investment, the process conditions(such as the feed particle size distribution, content, stability, not containing metallic foreign body etc.) very strict requirements, at the same time because of the difficulty to repair a roller surface wear, so the use cost is also very high, is not suitable for general use cement factory.

Vertical crusher, crushing machine which belongs to the class. For the vertical structure, a rotor main shaft, the rotor is provided with a plurality of hammer or blade, work spindle rotating speed, the material is cast to the lining board, out of the materials and bounce back to collide with each other and crushing material. The machine has the advantages of simple structure, low cost, have certain effect on increasing yield, but hammerhead, lining board wear quickly, discharge is thick (especially in the hammer wear after stimulation), saving greatly.

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