Technical data
Target group
: Operators
Machine type designation
: BB 51
Use for the intended purpose
The BB 51 is suitable for crushing of medium to extremely hard sub-
stances and brittle and hard/tough materials. The achievable final out-
put fineness can be up to 0.5 mm and less, depending on the input ma-
terial.
The maximum input grain size is 35 mm.
The materials which can be crushed in the BB 51 include the follow-
ing:
Bakelite // bauxite // concrete // dolomite // ores // feldspar //
granite // graywacke // glass // limestone // gravel // coal // coke
// corundum // quartz // salts // refractory clay // slag // silicates
// silicon // sintered materials // cement clinker, etc.
This machine is not designed as a production machine but as a labora-
tory machine intended for 8 hour single shifts with 30% total opera-
tion time.
Should you require any further details, the Retsch applications labora-
tory will be pleased to assist.
Do not modify the machine in any way, and use only spare parts and
accessories approved by Retsch.
The conformity with European Directives declared by Retsch
will otherwise be invalidated.
Furthermore, this will lead to all warranty claims being ren-
dered null and void.
Description of function
Comminution in the BB 51 is effected by means of pressure.
The crusher chamber
1
is funnel shaped and tapers down towards
the output end in accordance with the gap width which is infinitely
adjustable in steps of 0.1 mm.
The BB 51 has a gap width adjustment mechanism
5
linked to a fixed
crusher arm
4
and a moving crusher arm
3
. Both crusher arms are
fitted with replaceable jaws
2
between which comminution takes
place by means of pressure.
The eccentric motion ( eccentricity=2.4mm / 960min
-1
at 50Hz and
1028min
-1
at 60Hz ) of the moving crusher arm
3
steadily moves the
input material until it is fine enough to pass through the set gap
width and fall into a withdrawable receptacle
6
.
The convex form of the replaceable jaws
2
, which may be made of
various different materials accelerates the process of comminution
while preventing compaction and formation of bridges.
17.12.1998
©
Retsch GmbH
6
Doc. No. GB 98.056.9999
