FRITSCH PULVERISETTE 7 classic line - Manual (Page 8)

2.2.1 Operating principle
The grinding stock is crushed and ground by grinding balls in a grinding
bowl. The centrifugal forces from the rotation of the grinding bowls
around their own axis and from the rotating support disc act on the con-
tents of the grinding bowl which consists of grinding stock and grinding
balls.
The grinding bowl and the support disc have opposite directions of rota-
tion, so that the centrifugal forces alternate in the same direction and in
the opposite direction. The result is that the grinding balls run down the
inside of the bowl's wall providing a friction effect and the grinding balls
hit the opposite wall of the grinding bowl providing an impact effect. The
impact effect is amplified by the impact of the grinding balls against each
other.
a Rotation of the grinding bowl
b Centrifugal force
c Support disc movement
2.2.2 Drive motor and speed regulation
A maintenance-free three-phase motor operated via a frequency con-
verter is used as the drive.
2.3 Obligations of the operator
Before using the PULVERISETTE 7 classic line, this manual is to be care-
fully read and understood. The use of the PULVERISETTE 7 classic line
requires technical knowledge; only commercial use is permitted.
The operating personnel must be familiar with the content of the oper-
ating manual. For this reason, it is very important that these persons
actually receive the present operating manual. Ensure that the operating
manual is always near the device.
The PULVERISETTE 7 classic line may exclusively be used within the scope
of applications set down in this manual and within the framework of
guidelines put forth in this manual. In case of non-compliance or
improper use, the customer assumes full liability for the functional capa-
bility of the PULVERISETTE 7 classic line and for any damage or injury
arising from failure to fulfil this obligation.
Safety information and use
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