Fritsch PULVERISETTE 7 classic line, Руководство по эксплуатации, Страница: 8 / 30

Page 5
PULVERISETTE 7
1.3 Short Description of the Machine
1.3.1
Applications
The "pulverisette 7" planetary micromill is universally applicable for quick dry or
wet grinding of inorganic and organic samples for analysis, quality control, ma-
terials testing and mechanical alloying.
In synthesis, the planetary micromill can be used for mixing and homogenisa-
tion of dry samples, of emulsions and of pastes.
1.3.2
Method of Operation
The material is crushed and disintegrated in a grinding bowl by grinding balls.
The grinding balls and the material in the grinding bowl are acted upon by the
centrifugal forces due to the rotation of the grinding bowl about its own axis and
due to the rotating supporting disc.
The grinding bowl and the supporting disc rotate in opposite directions, so that
the centrifugal forces alternately act in the same and opposite directions.
This results in, as a frictional effect, the grinding balls running along the inner
wall of the grinding bowl, and impact effect, the balls impacting against the op-
posite wall of the grinding bowl.
1.3.3
Drive Motor and Speed Control
The machine is driven by a maintenance-free three-phase a.c. motor, which is
operated with a frequency converter.