The mill rests on a base (1) surrounded by a housing for the air distribution.

The base is provided with blades enabling the air entering the mill to follow a suitable tangential direction; this produces a first classification.

The base supports the grinding ring (2) to which it is rigidly attached.

Above the base is the grinding chamber (3) made in sections in order to facilitate the dismantling of the grinding rollers during the maintenance periods.

The drive consists of a transmission and a bevel gear train mounted in an oil-filled gear box (4). All the shafts and hubs are smooth and groveless.

All the connections are friction based releasable clamping assemblies.

The lower end of the vertical shaft supports a star (5) with two, three or four arms. From each of the arms a vertical roller journal (6) is freely suspended by means of two bearings. At the end of each journal there is a freely rotating grinding roller (7).

As the star rotates, it drives the journals and grinding occurs under the pressure of the grinding roller (7) against the grinding ring (2).

The raw material is fed by the star feeder (8) and falls into the base where it is picked up by the ploughs (9) and projected between the grinding rollers and the grinding ring.

The ground material is conveyed to the classifier (10) which may be static (simple or double cone) or dynamic, depending on the degree of required fineness. The oversized materials fall back from the separator into the base in order to be recycled till the fineness you desire.

The feed flow is automatically adjusted by a control system. In addition it assures pressure and load indication and safety.

The grinding installation and the mill are under negative pressure.

This vacuum enables clean air to be used to create a gap between fixed and rotating parts, preventing entry of dust into the mechanism and the roller journals. This arrangement makes the use of mechanical seals unnecessary.

Our mills are of a very robust construction, specially designed to allow easy maintenance.

They are built in a wide range up to 900 HP.