User Manual

6.10 Grinding with the impact rotor element

For the article numbers, please refer to our homepage or the spare parts

catalogue.

1 Motor mounting flange

2 Motor shaft

3 Labyrinth disk

4 O-ring, 94x3

5 O-ring, 88x3

6 Collecting vessel

7 Rotor

8 Impact bar (optional)

9 O-Ring 90x3 for impact element (optional)

10 Sieve ring

11 Lid seal

12 Collecting vessel lid

To carry out milling with a process similar to that of a cross beater mill,

there is an optional insert with impact bar (8) and an outer sieve ring

(10) with 1.0 mm trapezoidal perforation.

The rotor (7) with 8 teeth operates directly next to the impact bar (8).

This increases the shear stress on the source material. This provides for

faster coarse grinding of brittle source material. Additionally, the tem-

perature load on the source material for fine milling is significantly

lower.

During milling tests the best results were achieved with an 8-rib rotor (7)

and 1.0 mm sieve ring (10). However, any other rotor can be employed,

so that it is possible to use a rotor that is already on hand. If an existing

rotor will be used, only the impact bar and a matching sieve ring need to

be ordered.

The standard sieve rings cannot be used.

The handling of the impact rotor insert is the same as for the standard

grinding elements (see

Chapter 6.3 ‘Installing the grinding elements’

on page 27,

Chapter 6.5 ‘Removing the grinding elements’ on page 29

and

Chapter 6.4 ‘Conducting a grinding operation’ on page 28). The

sieve ring is just replaced with the impact bar (8) and outer sieve ring

(10).

The O-ring (9) serves to seal off the sieve ring (10) from the lid (12) of the

collecting vessel. First, the sieve ring (10) is placed over the impact bar

(8) and then the O-ring (9) is pressed into the groove.

In addition to the 8-blade rotor, the 12- or 24-rib rotors may also be

employed. For the order numbers of the different sieve rings, please

refer to the spare parts drawing.

Using the device

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