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Vertical Roller Mills

Grinding Technology

LOESCHE vertical roller mill – Loesche do much more than rely solely on our unbeatable technology.
Their designers are constantly coming up with new ideas and even more dependable components to reduce the already acclaimed low failure rate of our mills. The roller grinding mill technology patented in 1928 and continuously developed since then has become synonymous with Loesche‘s pioneering engineering know-how.

The special working and functional principles and the hydropneumatic spring loading system together make every Loesche mill operate with a great flexibility.

The material to be ground is crushed between the rotating grinding track and the individually guided grinding rollers. Grinding is carried out primarily through the application of compressive force vertically the secondary effect being the horizontal shear force.

The axes of the rollers which are inclined at 15° to the grinding bed bring about optimum fine grinding and at the same time result in minimum wear.

The mill is driven by an electric motor through a special gear system. The roller forces are taken by a segmental thrust bearing in the gear system.

The system of guiding the rollers in rocker arms is designed to accommodate a swing-out device; by connecting up an auxiliary cylinder to the rocker arm. The rocker-arm/roller unit can be pivoted completely clear of the mill housing.

Loesche roller grinding mills are the most efficient mills in the world and achieve very high throughputs. They are also extremely maintenance-friendly. Service tasks can be carried out quickly. Downtimes are therefore reduced to a minimum.

The Loesche module concept

Apart from manufacturing technology this has decisive advantages for the user:

  • The use of elements which have been tested in operation;
  • The individual masses which are of importance in the generation of dynamic forces are restricted: the number of rollers and not the individual roller mass is increased.