Improvements in Rotary Grinding or Crushing Mills.
Year: 1896

page_text: Date of Application, 19th Sept., 1896
Complete Specification Left, 11th June, 1897-Accepted, 17th July, 1897
Improvements in Rotary Grinding or Crushing Mills.
I JEAN HEINSTEIN, of Heidelberg in the Empire of Germany do hereby declare the
nature of this Invention to he as follows:-
The object of this Invention is to enable rotary grinding or crushing mills to be
worked continuously such mills as hitherto used have had to be charged or filled
prior to being started, while the material could not be removed until after the whole
of it had been ground.
A further feature of the improved mill is that, in it, the material goes through the
several grinding or crushing stages in one and the same apparatus, including the
preliminary breaking process, the crushing or grinding proper, and the sifting.
The improved grinding-mill is particularly fitted for use in the ceramic industry,
where it is necessary to keep the material from contact with metal, a result which
has not been attainable in connection with the existing ball-mills.
In a mill constructed in accordance with this Invention the crushing takes place
in an inclined cylinder, the angle of inclination being adjusted as desired. Rotary
motion may be imparted to the said cylinder by means of friction rollers, the shafts
of which are supported by bearings, and are driven by means of worm gearing.
A roller carried by a standard is provided at the lower end of the cylinder to
support it in position.
The cylinder may however be supported and driven, if preferred, by other suitable
means.
The said cylinder may either be fitted with a separate inner lining of iron, case
hardened casting, steel, quartz, granite, porcelain, or any other suitable material; or
it may, itself, have its interior constructed in the requisite form. The interior of the
cylinder is divided into two or more compartments, each of which is adauted to
receive balls of a suitable size; contiguous compartments being separated from each
other by perforated partitions or sifting fraines.
I will assume that there are two compartments in the cylinder. The material is
charged through a central aperture, by a funnel or hopper on which it can rotate and
falls into the first compartment, where it is subjected to preliminary crushing by a
large ball.
After undergoing this preparatory treatment, it passes into the second compartment
through a perforated plate or sifting frame which retains all the pieces that are too
large to pass through its meshes or perforations. The material is then further
crushed in the second compartment, by means of smaller balls, while a sieve, having
the required mesh, allows the material to drop through a discharge pipe capable of
rotating on or in a shoot if required.
The grinding may, if desired, be divided into more than two successive stages by
the provision of the required number of further compartments.
The interior or lining of the cylinder should be of such a shape as to offer to the
crushing balls a good supporting and frictional surface.
In the case of materials which cannot readily pass through the sifting frames their

page_text: progress can be assisted by means of a blast or current of air, which can be drawn
through the shoot by a suction-fan, whereby the finely divided material is exhausted.
Where the material requires to be treated in a moist condition, or by the wet
process, the finely divided portion will, of its own accord, be flushed through the
machine which, in that case, combines the action of a flushing apparatus with its
proper operation; since the coarse material will invariably sink below the finer, while
the latter, being in suspension in the water, will float along towards the outlet.
The balls as well as the chambers of the cylinder can where it is desired to prevent
contact of the substances under treatment with metal be made of quartz, granite,
porcelain, or other suitable material.
Dated this 10th day of Santambar 1000
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.
I. JEAN HEINSTEIN of Heidelberg in the Empire of Germany, 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:-
The object of this Invention is to enable rotary grinding or crushing mills to be
worked continuously.
Such mills as hitherto used have had to be charged, or filled, prior to being
started, while the material could not be removed until after the whole of it had been
ground.
A further feature of the improved mill is, that in it, the material goes through the
several grinding, or crushing stages, in one, and the same apparatus, including the
preliminary breaking process, the crushing or grinding proper, and the sifting.
The improved grinding-mill is particularly fitted for use in the ceramic industry,
where it is necessary to keep the material from contact with metal, a result which has
not been attainable in connectiom with the existing ball-mills.
I will describe my invention with reference to the accompanying drawing which
represents in longitudinal section in Figure 1, and in end view in Figure 2, an
apparatus constructed according to my invention.
The crushing takes place in an inclined cylinder a, the angle of inclination being
adjusted as desired. Rotary motion may be imparted to the said cylinder by means
of friction rollers l, the shafts of which are supported by bearings in standards m n,
and are driven by means of worins p on a shaft mounted in bearings on standards,
the said worms gearing with worm wheels o on the shafts carrying the rollers l.
A roller r, carried by a standard 8, is provided at the lower end of the cylinder a to
support it in position.
9,
The cylinder a may however be supported, and driven, if preferred, by other
suitable means.
The said cylinder a may either be fitted with a separate inner lining of iron, case-
hardened casting, steel, quartz, granite, porcelain, or any other suitable material; or
it may itself have its interior made of the requisite formn. The interior of the
cylinder a is divided into two, or more, compartments, each of which is adapted to
receive balls of a suitable size, contiguous compartments being separated from each
other by perforated partitions or sifting frames.
I will assume that there are two compartments in the cylinder. The material is
charged through a central aperture by a funnel or hopper on which it can rotate,

page_text: and falls into the first compartment, where it is subjected to preliminary crushing by
a large ball e.
After undergoing this preparatory treatment, it passes into the second compartment
through a perforated plate or sifting frame c which keeps back all the pieces that are
too large to pass through its meshes or perforations. The material is then further
crushed in the second compartment, by means of smaller balls f, while a sieve d,
having a mesh of the required size, allows the material to drop through a discharge
pipe capable of rotating on, or in, a shoot h, if required.
The grinding may, if desired, be divided into more than two successive stages, by
the provision of the required number of further compartments.
The interior, or lining, of the cylinder should be of such a shape as to offer to the
crushing balls a good supporting and frictional surface.
In the case of materials which cannot readily pass through the sifting frames, their
progress can be assisted by means of a blast, or current, of air, which can be drawn
through the shoot by a suction-fan, whereby the finely divided material is
exhausted.
Where the material requires to be treated in a moist condition, or by the wet
process, the finely divided portion will be flushed through the machine, which in
that case, combines the action of a flushing apparatus with its proper operation, since
the coarse material will invariably sink below the finer, while the latter, being in
suspension in the water, will float along towards the outlet.
The balls as well as the chambers of the cylinder can, where it is desired to prevent
contact of the substances under treatment with metal, be made of quartz, granite,.
porcelain, or other suitable material.
Having now particularly described and ascertained the nature of this invention,
and in what manner the same is to be performed, I declare that what I claim is :-
1. A rotary grinding or crushing mill provided with a preparatory breaking device
and means for the continuous feed and sifting and discharge of the material through
central apertures, substantially as hereinbefore described.
2. In a rotary grinding or crushing mill, a drum having chambers separated by
perforated or reticulated partitions so as to form two or more compartments in the
drum, in which the material is successively operated upon and whether provided with
means for passing liquid or air therethrough or not, substantially as hereinbefore
described..
3. A rotary grinding or crushing mill constructed and arranged substantially as
hereinbefore described and illustrated in the drawings, and having a single large ball
in the first compartment, which acts as a preliminary crusher of the material to be
subsequently reduced in the succeeding chamber or chambers substantially as
hereinbefore described.
4. A grinding or crushing inill as hereinbefore described and claimed having the
surfaces which come in contact with the material to be ground or crushed formed of,
or covered with quartz, granite, porcelain, or the like to enable materials to be ground
without coming into contact with any metallic parts.
Dated this 11th day of June 1907
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.