The pulverizing action of the Rotormill is supplied by a rotor which spins at high speed. This rotor is supported by heavy duty bearings which are located at either end of the shaft. This provides the stability necessary for greater material loading while also extending bearing life. The bearings are out of the grinding chamber and are protected from contamination.
The rotor itself consists of two sections:
- At the bottom is a fan which provides the air flow for the grinding system. In addition, the fan helps to accelerate and distribute the feed material prior to the material entering the grinding chamber.
- The top section is the grinding part of the Rotormill. It consists of a number of rows containing grinding plates which accelerate the air causing it to react with the grooved lining of the Rotormill. This interaction creates miniature pockets of rotating air at very high velocities. This air stream causes the particles to collide with each other and disintegrate while the heat caused by the size reduction is instantly absorbed by the rapidly moving air stream.
Finely ground material will pass through the classifier blades to collection while larger particles will be flung outward by centrifugal force into an adjustable recycle port for regrinding. The classifier speed may be changed to control the size particles that are rejected.Fine milling of a wide variety of materials:
Adjustment of the grinding plates, the style of grinding plates, and air flow, permit the fine milling of a wide variety of materials at high production rates without the temperature rise normally associated with the grinding of fine powders. In fact, many heat sensitive materials can be milled without cryogenic processing with a separate variable speed drive.carbon or stainless steel:
Rotormills can be constructed in carbon or stainless steel. Interiors can be furnished with hardened material for extended life, for grinding abrasive materials.Wear PARTS:
Grinding plates and liners can be fabricated from:
- Ceramic parts
- Tungsten carbide
- Abrasion resistant steel
- D2 tool steel
- Tungsten carbide welded overlayments