A New or Improved Grinding-mill.
Year: 1893

page_text: Date of Application, 17th Aug., 1893-Accepted, 20th Jan.,
1894
"
A New or Improved Grinding-mill.
A communication from abroad by CHARLES BONNEFOND, Director of The
Compagnie Français de Material de Chemins de Fer," 57, Rue Nationale,
at Ivry sur Seine, near Paris, in the Republic of France.
I WALTER ALFRED BARLOW of 7, John Street Bedford Row, London W.C.
Consulting Engineer, 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 :-
This invention relates to a new or improved metal grinding and bolting mill with
a conical receiver, the object being to effect the complete grinding of the wheat or
grain by gradual reduction. The mill will effect with equal perfection, both the
grinding and the conversion of the granular residue resulting from the first
operation.
In the illustrative drawings annexed hereto :-
Fig. 1 is a vertical section of such a mill of metallic grinding parts with conical
container capable of operating at will to effect the reduction of the grain and the
conversion of the residue.
Fig. 2 is a vertical section of the mill arranged specially and solely for the
conversion of the granular residue resulting from the grinding.
I will now describe the machine as illustrated by the drawings
:-
1, are cast metal columns of a piece with or bolted to the bed plate L. Upon
the columns is supported the conical container C, covered by a dome top K, which
is surmounted by the hopper E. V, is a central vertical shaft guided and held in
the collars D, D¹, and rests in a footstep v; two lubricators y, g', are provided to
the collars D D' respectively.
To the upper end of the shaft V, is keyed the moving grinder p p', and motion is
given thereto by means of a driving band and the pulley R, keyed on the lower end
of the shaft V.
The footstep v, rests upon a lever X, the free forked end whereof hangs on to
the nut at the lower end of a vertical rod screw threaded and carrying the hand
wheel a, by means whereof the footstep of the shaft V, may be raised and lowered
to vary the space between the upper turning or runner plate p p' and the lower fixed
plate P.
The two portions of the turning plate consists of the middle web portion pl, and
the outer portion or exterior crown p, which are connected by the inclined arms
which during the rotation induces a current of air which will accelerate the passage
of the material between the grinding portions and prevent heating.
The lower plate P, is supported by three studs or pivots c, fixed in three arms B,
cast with the container C, and the collar D.
India rubber washers r, are provided on the studs c, affording a yielding support,
vertically, to the mounting of the plate P, and allowing of the passage, between
the grinder plates, of foreign bodies.
I will next describe the details appertaining to the apparatus shown in Fig. 1 for
effecting at will the grinding and the conversion operations.
The two grinder plates for crushing and granulating are each formed of two
grinder rings a, a', and A, A'. The upper of these rings a, a', are attached to a
turning plate cast of a single piece p, p¹; but it is not so in the case of the lower
rings which constitute the nether or stationary grinder. The central ring A is fixed
on a central plate Q, completely distinct from the plate P, which is separate from
877

page_text: the outer ring A. This plate Q is supported (with washers of india rubber inter-
posed) by three vertical rods f, guided in the arms B, and fixed below in a plate or
carrier F.
A sieve T, is set up in the annular space which separates the two plates P, and Q,
downwards from the plane of the grinding rings A, and A'; it is divided in two
zones by a circular partition t, leaving between the lower edge thereof and the sieve
a slight passage or space in such manner that the material under treatment acted
upon by the current of air, is forced to spread out between the partition and the
bolting surface, which ensures perfection of the sifting action. Scrapers or rakes
fixed upon the upper turning plate will serve to facilitate the distribution of the
treated material upon the sieve T; a plug or cap serves to close or open a hand-
opening in the conical container, whereby the products may be tested as the grinding
proceeds.
The outer rings A, and a, are naturally of a finer cut than the inner concentric
rings A', and a', in order to accentuate the completeness of the reduction, as the
products escape at the circumference and fall into the conical container or covering
shoot C; from whence they will be directly discharged (without necessity for the
use of any rakes or scrapers) through the shoot or spout N, to be, by an elevator,
brought to an extractor which will separate the granular residue or semolina,
leaving free the flour in the sacks, all the coarser portions having been rejected.
To regulate the spacing apart of the grinding rings A, a, it will suffice, as A, is
fixed, to raise or to lower the upper plate p, p, fast on the shaft V, by operating
the lever X, by means of the hand wheel a.
y on
Also the distance between A', and a', may be regulated by the hand wheel
the lever Y, which will cause the platform F, and the rods, supporting the plate Q
and ring A¹, to be raised or lowered.
No modification is necessary in order to use the apparatus for the conversion of
the granular residues (les granaux); it will suffice (on proceeding from the
grinding and bolting operation to that of the conversion) to stop the supply of the
grain to the hopper E, and its passage e, and to pass the granular residue to be
converted, into the excentrically placed hopper E', which will discharge on to the
annular plate M, from whence by the action of centrifugal force it will be
distributed to the circumferential portions of the exterior grinding rings A, and a.
The regulation of this distribution of the material will be effected with extreme
simplicity by advancing or retiring the lower extremity of the hopper E', to or from
the plate M, by means of the screw upon the stem thereof which will admit of the
ready elevation or lowering of same.
A sheet guard k, fixed on the crown p, prevents the treated material from passing
over the edge of the grinder ring a.
Under the action of the centrifugal force enhanced by the current of air, the
granular material is driven between the outer grinding rings A, and a, are shaken,
pressed and rolled violently against and between the particles thereof, and
disintegrated by the mutual action there is produced a very fine and even flour,
round, light and never heated.
The residues which are discharged at N may be brought or carried to a bolting
separator which will separate the flour from the unreduced granular material which
may again be passed through the hopper E¹.
Such is the apparatus represented by Fig. 1 which may intermittently and from
time to time operate to grind the grain or to convert the resultant granular residue
or semolina.
If it be wished to work the apparatus in continuous manner to effect the grinding
continuously upon the one apparatus the converting of the residues may be done at
the same time upon a second apparatus which will be modified accordingly and as
is shown by Fig. 2.
The apparatus represented in Fig. 2, differs from the preceding in that it has
but one pair of grinding rings A and a, which is sufficient for the process of
conversion. Consequently the central lower plate Q, is done away with as are also

page_text: the three supporting rods f, and also their system of adjustment y,
be, the hand hole and plug G.
Y. and, it may
Further it is not necessary that the upper part of the shaft V, be bored out for
permitting the reception of the stem e of the hopper E. because the granular
residues are to be delivered directly upon the sphero-conical disc pl, which forms
the middle portion of the upper plate p, p', keyed on the shaft V.
The centrifugal force distributes the granular matters circularly, and the annular
plate or sheet guard M, guides them to and between the grinding rings A, and 'a,
where they will be subjected to the effect of the current of air by the wings m.
The conversion proceeds in substantially the same way as before described.
The conical sheet guard k, fixed on the crown p, prevents the material under
treatment from passing over the edge of the ring a.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed I declare that what
I claim is :-
1. The conical construction of the container C, which discharges by gravitation
the products, of grinding and conversion combined and operating substantially as
and for the purpose herein specified.
2. The construction and arrangement of the nether millstone made of two
separate plates P and Q as and for the purpose set forth.
3. The means for the regulation of the distance of separation of the grinding
rings consisting of the hand wheels and their connections æ, X, and y, Y, as set
forth.
4. The sieve T, arranged below the plane of the grinding rings and the
disposition of the circular grinding rings and the combination and arrangement of
the circular partition t, as and for the purpose set forth.
5. The mounting of the lower plates P, and Q, with the washers of india rubber
as described.
6. The combination of the side hopper E¹, of the distributor plate M, and the
sheet guard k, as and for the purpose specified.
7. The combined grinding mill apparatus as herein described in reference to and
shown by Fig. 1, of the drawings and for the purpose set forth.
8. The combined apparatus modified and operating as herein described in
reference to and shown by Fig. 2 of the drawings and for the purpose set forth.
Dated 17th August 1892
WALTER A. BARLOW,
Consulting Engineer and Patent Expert,
7, John Street, Bedford Row, W.C.
WALTER A. BARLOW,
Consulting Engineer and Patent Expert,
7, John Street, Bedford Row, W.C.