Improvements in and relating to Ball Crushing and Grinding Mills.
Year: 1899

page_text: COMPLETE SPECIFICATION.
Improvements in and relating to Ball Crushing and Grinding Mills.
I, EMIL FRITSCH, of No. 157, Merseburgerstrasse, Halle on the Saal, Germany,
Engineer, do hereby declare the nature of my said invention and in what manner
the same is to be performed to be particularly described and ascertained in and by
the following statement:-
-
In ball crushing and grinding mills as hitherto in use the material to be treated
has been fed to the ball drum through an axially arranged inlet and was allowed
to leave the drum through an axially arranged outlet.
With this arrangement it was not possible to fill the drum to a level above the
axis for obvious reasons. It is however well known that the working of the
mill will be more economical if the drum is filled or as nearly filled as possible
within certain limits, i.e. sufficient space always being left for the free play of the
balls.
According to the present invention the inlet and outlet openings of the drum are
arranged as near the periphery of the same as possible so that the drum may be
filled to the extent of two thirds its capacity or even more.
In order to render the present specification more easily intelligible reference is
had to the accompanying drawing in which similar letters of reference denote
similar parts throughout the several views.
Fig. 1 is a longitudinal section through the mill,
Fig. 2 an end view with the inlet shoot in section on line 2, 2 Fig. 1,
Fig. 3 a sectional end view on line 1-1 Fig. 1, showing the outlet.
At each end of the drum a are arranged a series of openings b and c as near the
periphery as possible. f is the inlet shoot having an annular chamber e (Fig. 2)
or a circular one e', (Fig. 1) which covers all the openings 6 as the drum revolves.
d is the outlet chamber covering all the outlets c and serving to conduct the
ground material out at d As indicated in dotted lines at a¹ in Figure 1 the
interior of the drum may be provided with spiral ribs to transport the material
from the inlet to the outlet end of the drum. The inlet or outlet openings may
also be provided with sieves so as to prevent the exit of the material before the
same has been ground to the required fineness.
The accompanying drawings are diagrammatical, and not constructional as the
openings may be arranged in any convenient manner and if required they might
be made in the ends of the cylindrical part of the drum, although this does not
appear so suitable as in the ends.
The openings are advantageously in the form of slots and may be slanted towards
the interior of the drum for the inlets and towards the exterior for the outlets.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. A ball crushing or grinding mill having a series of inlet and outlet openings
at either end of the same, close to the periphery of the said drum and means for

page_text: conducting the material to be treated to the inlet end and the treated material
from the outlet end of the drum in the manner and for the purpose substantially
as described.
2. In a ball crushing or grinding mill the combination of a series of inlet slots
arranged at one end near the periphery and a similar series of outlet slots at the
opposite end, stationary chambers to cover said slots and means for conducting
the material to the inlet chamber and from the outlet chamber substantially as
described.
1000
A. M. & WM. CLARK,
53, Chancery Lane, London.
Chartered Patent Agents,