Air Stream Fine Grinding Technology
Fine grinding principle and features
① The raw material is supplied to fine grinding mill body in a circumferential direction.
② It rotates at high speed with the swirling flow generated by the high-speed rotor in the machine<br> and is introduced into the grinding chamber.
③ In the grinding chamber, the particles are accelerated from the center of the rotor in the radial direction of the rotating blades and collide with the particles swirling around the outer periphery at high speed.
② It rotates at high speed with the swirling flow generated by the high-speed rotor in the machine<br> and is introduced into the grinding chamber.
③ In the grinding chamber, the particles are accelerated from the center of the rotor in the radial direction of the rotating blades and collide with the particles swirling around the outer periphery at high speed.
④ The tangential vortex formed after the blade rotates and A vortex of air in the normal direction similar to the wingtip vortice of an airplane formed on the surface of a blade are rotated at high speed by the swirling airflow generated by the rotation of the blade. The vortex and swirling airflow amplify the particle collision at an accelerating rate, and fine grinding proceeds.
⑤ Particles crushed by particle collision move to classification zone.
⑥ Only coarse particles are once discharged to the outside of fine grinding mill by a high-speed swirling air stream.
⑦ The discharged coarse particles return to fine grinding mill rotating rotor from the reintroduction line arranged on the rotating shaft.
⑧ The reintroduced coarse particles are accelerated by the rotation of the blades and arrive at grinding chamber, where they collide with each other and are fine grinding again.
Key Points
◆ The rotating rotor blades generate a swirling flow.
◆ It has the role of accelerating the particles in the radial direction.
◆ Particle collision (autogenous fine grinding) by swirling flow is the main grinding action.
* The principle is different from impact pulverization in which particles collide with a blade or repulsion plate.
◆ It has the role of accelerating the particles in the radial direction.
◆ Particle collision (autogenous fine grinding) by swirling flow is the main grinding action.
* The principle is different from impact pulverization in which particles collide with a blade or repulsion plate.
◎ Since the temperature rise is small, it is suitable for fine grinding of
heat-sensitive materials.
◎ Since it consumes less power, running costs are low.
◎ Since the machine wears less, it suppresses the occurrence of contamination.
◎ Since it consumes less power, running costs are low.
◎ Since the machine wears less, it suppresses the occurrence of contamination.