Improvements in Grinding and Crushing Mills.
Year: 1892

page_text: Date of Application, 10th Dec., 1892-Accepted, 21st Jan., 1893
COMPLETE SPECIFICATION.
[Communicated from abroad by DIE ACTIEN GESELLSCHAFT GRUSONWERK, of
Magdeburg, Buckau, in the Empire of Germany, Manufacturers.]
Improvements in Grinding and Crushing Mills.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, do hereby
declare the nature of this invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:
My invention relates to grinding and crushing mills and more particularly to
combined edge-runner and ball mills.
An important feature of a mill constructed according to this invention is that
the runners or mill stones are made hollow and balls are placed in the hollow
interiors of the same, into which interiors the material to be crushed is
first introduced. Communication between the interior and exterior peripheries
of each runner is afforded by a series of holes formed in its circumference. In
this manner each runner forms a ball mill which not only disintegrates the material
introduced into its interior to such an extent that it can fall through the holes
in the periphery of the runner but the small pieces which fall through the said
holes are further disintegrated by being crushed in the pan as the runners roll
over them.
In order that my said invention may be clearly understood I will now proceed
to describe the same with reference to the accompanying drawing which illustrates
a vertical edge-runner and ball-mill constructed according to my invention. The
said mill is partly in elevation, and partly in section in a vertical plane.
In the said drawing, A, A, are the two hollow runners adapted to turn in
the well-known manner upon the arms B, and driven by the shaft C by means
of the drag cranks D. a a are holes in the periphery of the said runners. The
interior space of each runner, provided with balls E, is in communication by
the annular opening F in its inner walls, with the feed hopper J surrounding the
shaft C.
The material to be crushed, which is previously broken up into coarse pieces,
is first conducted to the feed hopper J which is fixed upon the stationary sheet-
metal casing H, which surrounds the whole mill so as to prevent the escape of
dust, and through which the shaft C passes, and drops into the distributing
funnel K provided within the sheet metal casing and secured upon the said shaft C.
Thence it passes through the two outlets L and the admission funnels G into the
runners A A, in which it is disintegrated by the balls E. When the material
arrives at a certain degree of fineness it is ejected through the holes a in the
periphery of the runners, into the runner pan M.
As shown, the holes a are arranged to point obliquely towards the centre of the
pan, because by reason of centrifugal action the material would pass sooner towards
the outer circumference of the pan if the holes were for instance, at a right angle
to the axis of rotation.
By the arrangement described the material from one runner is thrown in front
of the next runner which disintegrates it completely. A scraper or guide (not
shown in the drawing) arranged behind each runner then moves the pulverulent
material towards the circumference of the runner pan into a discharge opening
provided therein.
The advantage of the employment of the hereinbefore described arrangement of
apparatus consists in that with a given expenditure of power such as would be
needed for an ordinary vertical mill a greater output than the ordinary output is

page_text: realized, because, without increasing the masses to be moved in the runners made
to form ball mills, a preliminary disintegration of the material introduced into the
said runners is effected.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed as communicated to me by
my foreign correspondents, I declare that what I claim is :-
1. A hollow perforated edge-runner provided with balls, substantially as herein-
before described for the purposes specified.
2. A bollow perforated edge-runner with holes arranged obliquely in the
periphery of the same, substantially as hereinbefore described for the purpose
specified.
3. An improved combined edge-runner and ball-mill substantially as herein-
before described with reference to the accompanying drawing, for the purpose
specified.
Data: የለ
1
2000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.