Planetary ball mill

A planetary ball mill comprising:

• a revolution turning arm turning about a revolution shaft rotated by a driving force;
• a mill pot turnably supported on said revolution turning arm through a rotation shaft inclined at an inclination angle from the vertical direction toward the side of said revolution shaft;
• an outer circumferential pot receiver which is fixedly disposed on the upper side of said revolution turning arm over the whole part of a circumference around said revolution shaft and with which an outer peripheral surface of said mill pot revolving attendantly on the turning of said revolution turning arm makes contact, whereby said mill pot is put into rotation;
• and a plurality of grinding medium balls.
• wherein an inside bottom of said mill pot has a concave spherical shape,
• a rotational speed of the mill pot is higher than a revolutional speed of the revolution turning arm, and
• a revolutional centrifugal force of the revolution turning arm and a rotational centrifugal force of the mill pot inclined at the inclination angle cause;
• the grinding medium balls and matter to be ground in the mill pot to climb upward, while spinning at high speed, along the inside surface of the mill pot inclined at the inclination angle.