Improvements in Pulverizing Machines.
Year: 1892

page_text: COMPLETE SPECIFICATION.
[Communicated from abroad by URIAH CUMMINGS, of 376, Whitney. Avenue, in
the City of New Haven, in the County of New Haven, in the State of
Connecticut, United States of America, Manufacturer.]
Improvements in Pulverizing Machines.
1, 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:
This invention relates to the class of machines which are employed for pulverizing
or reducing cement, ores and other hard substances.
My invention has for its objects to construct a compact and durable pulverizing.
machine of large capacity; to so organize the machine that the parts which are
subjected to wear can be readily removed and replaced, when necessary, and finally
to provide the feed hopper of the machine with simple means for regulating and
cutting off the flow of the material to the pulverizing devices.
In the accompanying drawings
Figure 1 is a longitudinal sectional elevation of the machine a portion of the
driving shaft of one of the rotary grinding discs and the driving pulley and bearings
of said shaft being omitted.
Figure 2 is a side elevation of my improved pulverizer._
Figure 3 is a vertical cross section thereof on-line x, x Figure 2.
Figure 4 is a face view of one of the rotating grinding discs on an enlarged.
scale.
Figure 5 is an enlarged rear view of one of the stationary grinding discs.
Figure 6 is a face view of said stationary disc.
Figure 7 is an end view on an enlarged scale, of one of the rings whereby the
stationary grinding discs are clamped against the casing of the machine.
Figure 8 is a side elevation of said ring.
Like letters of reference refer to like parts in the several figures.
A represents the casing of the machine provided at its base with flanges a
whereby it is secured to beams A' or other supports. The casing is formed in its
upper portion with a vertical throat or passage B with which is connected a feed
hopper C, surmounting the casing.
DD are upright stationary grinding discs or rings secured to opposite ends of the
casing A, and E are rotary grinding discs arranged opposite the stationary discs and
mounted respectively upon independent horizontal driving shafts f, f. These shafts
are journalled in bearings F secured to the beams A' and each shaft is provided
with a driving pulley F. Each stationary grinding disc is formed with a central
opening or eye d and has its face provided with radial grinding ribs or teeth, or any
other suitable dress. The casing A is provided in opposite ends with openings
which coincide with the eyes of the stationary grinding discs. hh are inclined
deflecting surfaces which slope from a transverse ridge in the middle of the case
to the lower edges of the openings g, so as to direct the descending material
laterally in opposite directions to and through the eyes of the stationary grinding
discs.
Each of these stationary discs is provided on its rear side, near its lower edge,
with an arc-shaped or semi-circular rib or tenon i which fits into a corresponding
groove i formed in the adjacent face of the casing. This rib i projects downwardly
and the groove is undercut, as shown in Figure 1, so as to prevent withdrawal of
the rib from the groove, except by raising the disc sufficiently to allow the rib to
clear the lower undercut edge of the groove. The upper portion of the stationary¨

page_text: grinding disc is clamped against the end of the casing A' by a ring k which is
provided at its rear or inner edge with lugs--which bear against lugs or ears
projecting radially from the rim of the stationary disc at its top and sides. This
clamping ring surrounds the rotary grinding disc at a suitable distance therefrom
and is held against the lugs of the stationary disc by a curb M enclosing the pair of
grinding discs and secured to the end of the casing by screw-bolts m. The curb M
is formed with an internal annular shoulder m' which bears against the outer edge
of the clamping ring k, so that, upon tightening the bolts of the curb, the lugs of
the ring are forced inwardly against the lugs of the stationary grinding disc, causing
the ring to clamp the disc tightly against the end of the casing. This construction
forms a very simple fastening which dispenses with the use of bolts or similar
fastenings and permits the stationary disc to be readily secured in place. The
ring also serves as a wearing surface which receives the impact of the pulverized
material which is discharged from the periphery of the grinding disc. This ring
and the stationary grinding disc are preferably formed of chilled iron. When the
ring is worn out, it is readily replaced by a new ring upon removing the curb M.
In order to enable the ring to be removed and replaced without disturbing the
shaft the ring is split, as shown in Figure 8, so that it can be sprung over the shaft.
The curbs M are provided with stuffing boxes for the passage of the driving
shafts.
Each rotary grinding disc is provided with a removable face plate N made of
chilled iron and having a suitable dress or grinding surface. The face. plate is
secured to the face of the rotary discs by bolts or other fastenings, so that it can be
readily removed when it becomes unserviceable from excessive wear, thereby
avoiding the necessity of replacing the entire grinding disc.
The grinding faces of the stationary and rotary discs approach each other from
the eye of the stationary disc to the peripheries of the discs, at which latter point
they are arranged so closely together that the pulverized material is reduced to
the desired degree of fineness when it is discharged from the peripheries of the
discs. Each shaft is preferably provided at its outer end with an adjusting
device N' by which the rotary disc can be adjusted toward and from the stationary
disc.
The casing A is provided with an inclined or hopper-shaped bottom O which
receives the pulverized material and from which the latter is conducted to a suitable
receptacle by a spout O', the casing being provided below the lower edge of the
stationary disc with slots P through which the material passes from the curb into
the receiving hopper.
9, 9 are pivoted gates or valves arranged in the throat of the casing and whereby
the flow of the material to the grinding discs may be regulated or cut off. These
feed gates are secured upon transverse rock shafts r, r journaled in the sides of the
casing and provided with arms for turning the shafts. S is a hand lever formed.
at its inner end with a cross heads which is pivoted at its centre to the outer side
of the casing A. The outer ends of the arms rare connected with opposite ends of
the cross-heads by rods or links s'. Upon swinging the hand lever in one or the
other direction, its cross-head causes the links to move the arms of the rock-
shafts inwardly or outwardly simultaneously, thereby swinging the depending
feed gates toward or from each other and restricting or enlarging the passage in
the throat of the casing. The feed may thus be regulated as desired, or it may be
entirely shut off by swinging the feed gates against each other, as shown by dotted
lines in Figure 1.
The material supplied to the feed-hopper descends in the throat of the casing
and is directed by the inclined surfaces between the faces of the grinding discs by
which it is crushed and ground. As the two rotating discs are mounted upon the
inner ends of two independent shafts, an unobstructed space is formed above_the
transverse saddle which is composed of the inclined deflecting surfaces h. This
open space lies directly underneath the throat and the material to be ground enters
this open space freely and then passes down the inclined sides of the saddle into and

page_text: through the eyes of the stationary grinding discs, which eyes are also unobstructed,
so as to permit the material to enter freely. The weight of the material in the
throat and feed-hopper passes directly upon the material in the eyes of the discs.
and insures a constant and uniform feed. The pulverized material is discharged at.
the periphery of the discs, a portion thereof falling directly into the receiving
hopper O, while the remainder is thrown against the surrounding ring k from
which it passes into the curb and thence into the receiving hopper through the
slots P. As the rotary discs run in close proximity to the stationary discs, none of
the material can escape until it has been reduced to the desired degree of fineness.
The material is thus pulverized to a uniform degree of fineness by a single passage
through the machine.
My improved pulverizer is very simple in construction, has a very large capacity,.
and is especially desirable for pulverizing cement, phosphates, ores and other hard
substances.
In the drawings, a double machine having two pairs of grinding discs is shown,
but, if desired, a single pair of discs may be employed.
Having now particularly described and ascertained the nature of the said inven--
tion 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 :-
First. The combination with the stationary case provided in its upper portion
with a vertical throat or passage and in its end with an opening communicating
with said throat, of a stationary grinding disc or ring secured to the case around
said opening, a rotary grinding disc facing the stationary grinding disc, a curb or
casing enclosing said discs, and a removable wear ring surrounding the discs and
arranged on the inner side of the curb for receiving the impact of the pulverized
material escaping at the peripheries of the discs, substantially as set forth.
Second. The combination with the case, of a removable grinding disc applied to
the end of the case, a curb removably secured to the end of the case and surrounding
the grinding disc, and a clamping ring interposed between said grinding disc and the
curb, whereby the disc is removably held in place on the case, substantially as set
forth.
Third. The combination with the case having a groove in its end, of a removable-
grinding disc applied to the end of said case and provided on its rear side with a
rib or tenon entering said groove and at its marginal edge with lugs, a curb.
enclosing said disc and secured to the case, and a clamping ring interposed between
said curb and the lugs of the grinding disc, substantially as set forth.
Fourth. The combination with the casing constructed with circular openings in.
its sides, a central feed throat communicating freely with said openings, a transverse
Baddle having its inclined sides extending to the lower edges of said circular
openings, stationary grinding discs surrounding said openings, and a discharge
passage underneath said saddle, of separate shafts arranged on opposite sides of the
case, rotary grinding discs secured to the inner ends of said shafts, and curbs
enclosing the grinding discs, substantially as set forth.
Fifth. The combination with the casing provided with an opening in its side, a
feed throat leading to this opening and a stationary grinding disc surrounding said
opening, of a curb secured to the side of the casing outside of the stationary
grinding disc, a horizontal driving shaft having its inner end arranged within
the curb and outside of the stationary grinding disc, and a rotary grinding disc
secured to the inner end of said shaft, the opposing faces of the stationary and
rotary grinding discs converging toward the peripheries of the discs, substantially
as set forth.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.