Improvements in and relating to Pulverizing Apparatus.
Year: 1894

page_text: Date of Application, 30th July, 1894
Complete Specification Left, 30th Apr., 1895-Accepted, 27th July, 1895
[Communicated from abroad by EMILE JOLICARD, of 31 Rue de l'Hôtel-de-Ville,
Lyon, in the Republic of France, Engineer.]
Improvements in and relating to Pulverizing Apparatus.
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 to be as follows:
-
This invention relates to pulverizing apparatus.
In the pulverizing apparatus heretofore employed, whether they act by crushing,
projection or by concussion of the materials against each other, it is needful
either to sift the products leaving such apparatus for obtaining the desired degree
of fineness or to utilize the suction power of a separate fan for carrying away
the said pulverized materials and cause them to be deposited in chambers wherein
they are sorted according to their degree of fineness; but in either case a certain
quantity of materials is produced which has not the desired degree of fineness and
which it is necessary either to reject or to pass again to the pulverizing apparatus.
The apparatus which forms the subject of the aforesaid invention, by suitable
regulation, enables me to collect only such materials as have the desired degree of
fineness without any necessity for sifting or sorting them.
It is substantially composed of parts for effecting the pulverization of the
materials and of parts of a centrifugal fan for producing a continuous current of
air in the same direction and at a sufficient velocity for carrying away the pulverized
materials. This apparatus constitutes a centrifugal fan turning at a great velocity
and at the periphery of which are arranged articulated beaters turning together in
the same drum and effecting the crushing of the materials.
A pulverizing apparatus constructed according to this invention comprises a fan
formed of a movable part with a crown and bent vanes arranged in a drum of
cast iron.
Upon the periphery of the crown I fix articulated beaters which may be varied
in form and adapted to turn rearwards so as to leave space enough between them
and the circular wall of the casing or drum in order that there may be no wedging
action and stoppage in consequence of the introduction of very hard bodies with
the material to be pulverized. These beaters may be varied in number and
provided with recesses forming teeth of dimensions which may be varied according
to the nature of the material to be crushed and the degree of fineness required.
A hopper receives the material to be pulverized and distributes it by an endless
screw or conveyor into an inclined channel whence it passes into the pulverizer.
The latter moving at a very great velocity the material is immediately carried
away, projected against the sides or walls, triturated by the beaters and completely
crushed by the repeated concussion of the grains with each other; then the
mixture of air and dust obtained in this operation taking place at a great velocity
escapes through a vertical pipe and is conveyed to a device for separating the
grains. There it first impinges against a partition or baffle plate which divides it;
then as the device for separating the grains offers to the mixture of air and dust
a larger and variable section according to the position of a movable plate there
will take place a diminution in the velocity of the said mixture, which diminution
has the immediate effect of separating therefrom the largest and consequently the

page_text: heaviest particles, which tend to fall into the funnel forming the lower part of the
separator, and return to the crusher, being forced into a return pipe by a portion
of the air current.
The other portion of the air current which holds the finest materials in
suspension then passes through a conduit having at its front part a discharge
valve. By diminishing the opening of this valve only a small portion of the air
current will be allowed to pass into the said conduit; the smaller this quantity
of air the smaller will also be the velocity of the same in the conduit and the finer
will be the pulverized particles carried away by it. Moreover the fineness of the
material is regulated by the separator itself according to the position of the
aforesaid movable plate.
The general conduit behind the discharge valve may terminate either in one or
more dust chambers where the pulverized material is deposited and whence the
air escapes through a cloth filter, or to furnaces for pulverized fuel for which the
improved apparatus has been specially adapted, or to any other apparatus for
collecting or utilizing the dust produced.
Dated this 30th day of July 1894.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
Improvements in and relating to Pulverizing Apparatus.
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 pulverizing apparatus.
In the pulverizing apparatus heretofore employed, whether they act by crushing,
projection or by concussion of the materials against each other, it is necessary
either to sift the products leaving such apparatus for obtaining the desired degree
of fineness or to utilize the suction power of a separate fan for carrying away the
said pulverized materials and cause them to be deposited in chambers wherein
they are sorted according to their degree of fineness; but in either case a certain
quantity of materials is produced which has not the desired degree of fineness
and which it is necessary either to reject or to pass again to the pulverizing
apparatus.
The apparatus which forms the subject of my aforesaid invention, by suitable
regulation, enables me to collect only such materials as have the desired degree of
fineness without any necessity for sifting or sorting them.
It is substantially composed of parts for effecting the pulverization of the
materials and of parts of a centrifugal fan for producing a continuous current of
air in the same direction and at a sufficient velocity for carrying away the
pulverized materials. This apparatus constitutes a centrifugal fan turning at a
great velocity and at the periphery of which are arranged articulated beaters
turning together in the same drum and effecting the crushing of the materials.
In the accompanying drawing,
Figure 1 is a front view showing the pulverizing apparatus partly in section.
Figure 2 is a side view partly in section of the same apparatus and
Figure 3 represents a side view in section of the interior of my apparatus.
A pulverizing apparatus constructed according to my invention comprises a
fan A formed of a movable part with a crown and bent vanes arranged in a drum
of cast iron.
Upon the periphery of the crown I fix articulated beaters P, Figures 1 and 3

page_text: which may be varied in form and adapted to turn rearwards so as to leave space
enough between them and the circular wall of the casing or drum in order that
there may be no wedging action and stoppage in consequence of the introduction
of very hard bodies with the material to be pulverized. These beaters P, may be
varied in number and provided as shown in Figure 1, with recesses forming teeth
of dimensions which may be varied according to the nature of the material to be
crushed and the degree of fineness required.
A hopper B receives the material to be pulverized and distributes it by an
endless screw or conveyor into an inclined channel C whence it passes into the
pulverizer through the conduit A' having a constant section of air passage from
the centre towards the periphery for obtaining a higher pressure of air. The said
pulverizer moving at a very great velocity the material is immediately carried
away, projected against the sides or walls triturated by the beaters P and
completely crushed by the repeated concussion of the grains with each other;
then the mixture of air and dust obtained in this operation taking place at a great
velocity escapes through a vertical pipe G and conveyed to a device D for
separating the grains. There it first impinges against a partition or baffle
plate d which divides it; then as the device for separating the grains offers to the
mixture of air and dust a larger and variable section according to the position of
a movable plate H there will take place a diminution in the velocity of the said
mixture, which diminution has the immediate effect of separating therefrom the
largest and consequently the heaviest particles, which tend to fall into the funnel,
forming the lower part of the separator, and return to the crusher, being forced
into a return pipe E by a portion of the air current.
The other portion of the air current which holds the finest materials in suspension
then passes through a conduit F, having at its frout part a discharge valve V.
By diminishing the opening of this valve V only a small portion of the air current
will be allowed to pass into the said conduit F; the smaller this quantity of air
the smaller will also be the velocity of the same in the conduit F and the finer
will be the pulverized particles carried away by it. Moreover the fineness of the
material is regulated by the separator itself according to the position of the
aforesaid plate H.
The general conduit F behind the discharge valve V may terminate either in
one or more dust chambers where the pulverized material is deposited and whence
the air escapes through a cloth filter, or to furnaces for pulverized fuel for which
my improved apparatus has been specially adapted, or to any other apparatus for
collecting or utilizing the dust produced.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is :-
1. An apparatus consisting of a centrifugal crushing fan having a constant
section of air passage from the centre toward the periphery, for obtaining a high
pressure of air, this apparatus being combined with movable beaters, designed for
the crushing or pulverization of the substances introduced through the orifices of
the crushing apparatus simultaneously with the air.
2. The use of the above described apparatus composed of a crusher and a fan,
with air and pulverized coal feed to furnaces adapted for burning fuel in a
pulverized state substantially as described and shown in the drawing.
Dated this 30th day of & nril 1895
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.