Fulverizing ores and other substances.
Year: 1888

page_text: Fulverizing ores and other substances.
...I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent Agents South-
ampton Buildings, in the County of Middlesex, do horeby 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 pulverizing machines for stone, ore and other material and
comprises certain novel constructions, combinations and arrangements of parts, whereby
such machines are greatly improved and rendered more effective in their operation.
In the accompanying Drawings:
¿
Figure. 1, is a side elevation of my improved pulverizer as adapted for dry
pulverization.
Figure 2, is a longitudinal central section of the same.
Figure 3, is a perspective view of a revolving elevator which co-operates with the
backward feed of the improved pulverizer.
Figure 4, is an end view of the pulverizer.
Figure 5, is a vertical transverse section of the same.
Figure 6, is a transverse section of the revolving elevator on the line x, x of
Figure 2.
Figure 7, is an end view of an interchangeable head piece for the pulverizer when
adapted for wet crushing.

page_text: Figure 8, is a section of a portion of the pulverizer when provided with the head
piece shown in Figure 7, this section being taken in the line'y, y of Figure 7; -
Figure 9, is an elevation of one of the inner hollow crushing rollers.
Figure 10, is an elevation of the other inner crushing roller, the same being con-
structed to serve also as a back or return feeding device, and
Figure 11, is an outline view of my pulverizer arranged for dry crushing, the feed
operating mechanism being omitted.
A represents an outer case or hollow cylinder, G an inner hollow pulverizing roller
of smaller diameter than the cylinder, and H another hollow pulverizing roller of
smaller diameter than the roller G, and placed inside the said roller and provided on
its inside with a hollow screw which serves as a back or return feeder.
The cylinder A and the rollers G and H are not constructed to be supported by
central axles or shafts, as will appear from the description hereinafter given. The
hollow cylinder A is provided on its periphery with annular raised bearings a which
bear upon the periphery of the supporting rollers a¹, which are mounted by
means of the shafts a upon suitable standards a². The rollers a' are provided with
flanges a whereby the cylinder A is held from longitudinal movement, while its
weight and that of the rollers G and H is sustained upon the peripheries of the
rollers.
A toothed rim a³ is fastened on head A¹ of the cylinder, and into the same a
pinion d of an operating counter shaft D, gears. The counter-shaft D is provided
with a pulley d which is driven by an ordinary belt from a suitable motor.
Near the pulley d' a cam & having stops d³ is fastened to the counter shaft D. A
lever D' pivoted at to a supporting stand ₫ bears with its lower arm d³ upon the
surface of the cam d³, while with its higher arm & it supports the swinging end
portion of a chute e pivoted at e¹ to the bottom portion of a hopper E. As the cam d
revolves, it, by its steps d³ causes the lover D¹ to vibrate intermittently on its pivot d*,
and the lever D' by striking the chute e on its under side and then falling out of..the
way causes the free end of said chute to rise and fall suddenly and the feed from the
hopper to the cylinder A to be facilitated. In order to regulate the fall or drop of the
free end of the chute e, a cord or strap e³ is connected to its lower portion, which
cord is passed up over a pulley e³ and from thence down to a small adjusting windlass e*.
By winding more or less cord upon the said windlass, the free end of the chute will
be more or less elevated, and the inclination so changed that the chute will be moved
corresponding by the motions of the lever D¹, and thus its feeding capacity can at
pleasure be increased or diminished.
The chute e partly enters the cylinder A through an opening at in the front head A¹,
the inner surface of which opening is provided with a screw thread a', this thread
being right handed when the revolution of the cylinder is left handed, as indicated by
the arrow in Figure 1. This construction of the opening at with the screw thread a
assists the feed into cylinder A and also prevents a backward escape of the contents of
the cylinder through the opening a, such material as may be caused to fall back
into the screw threaded opening a being collected in the spiral channel formed by the
screw thread a' and guided and returned into the cylinder. The cylinder A is
provided with a concentric removable lining of durable corrugated, cylindrical,
metallic sectors F arranged to form parallel grooves ƒ (Figure 5) which servo as
elevating and distributing buckets. The corrugations f¹ of said sectors are at right
angles to the axis of the cylinder A, and serve as guides to similar corrugations f
formed on the outer surface of the hollow pulverizing roller G which revolves in the
cylinder A.
The hollow roller G is provided on its interior surface with corrugations /** similar
to those f³ on its outer surface and those f¹ on the interior of the cylinder A. At
suitable intervals, openings ÿ are provided in the roller G for establishing communica-
tion from the exterior to the interior of the same. The corrugations ƒ* of the roller G
serve as guides to the outer corrugations of the roller H which revolves within
the roller G. The corrugations of the roller H are traversed by longitudinál

page_text: .
grooves which serve as elevator buckets, in the same manner as the grooves of the
cylinder A. Longitudinal grooves as h¹ may traverse the corrugations of roller G
for forming buckets for elevating and carrying over the material from one side of the
machine to the other, thereby ensuring repeated return of the material to the reducing
surfaces.
The hollow screw of the roller H has its thread pitched to feed backward or toward
the feed hopper E and by it such crushed material as is too large to be discharged or
is not sufficiently pulverized when it arrives at the discharge end of the machine, and
eccumulates in the space between the head J and rear end of the cylinder A and
roller G, is conveyed back and discharged into the space between the head A¹
and the receiving ends of the rollers G, H, so as to again pass between the pulverizing
surfaces and to the discharging end of the pulverizer.
I is an elevator fastened to the roller H and serving for dipping up and deposit-
ing the insufficiently pulverized material into the roller H so that it may be fed back
by the screw to the front end of the cylinder A, for the purpose above stated. The
elevator I consists of a number of radial arms i, which are hollow and are united at
the axis of the roller H and have openings communicating with the interior of the
roller. The outer end portions of the arins i are provided with openings through
which the material to bo fed hack passes from the cylinder A into the arms i in its
passage into the roller H.
The cylinder A is provided with flanged, removable, interchangeable heads J, J.
The head Jis solid and has a central discharge opening j, and is used when crushing
dry material, the more buoyant parts of which are drawn out through the opening j
by means of a fan ¹ as illustrated in Figure 11. By regulating the force of the draft
by an ordinary sliding valve such as shown at the withdrawal of the material from
the cylinder A will be finer or coarser as desired. The head J¹ which is used for wet
crushing, that is with a flowing stream of water introduced through a pipe Ja, is
constructed with an annular opening between its outer rim and central disc ³, its
rim and disc being united by radial arms upon which wire netting is applied as
shown. At the centre of the disc j the water pipe J is inserted. When the head.]¹
is substituted for the head J, the sufficiently pulverized material is discharged with the
flowing water through the meshes of the wire netting and the coarser parts retained
for return by the screw for a further pulverizing action. The material, stone, or
other substance, introduced into the pulverizer may be of about nut nize, and it inay
be dumped into the hopper, or delivered by means of an ordinary chute from an ordinary
rock crusher to said hopper.
At the beginning of the operation, say for dry pulverization, the feed is operated
with a given extent of oscillation of the chute e, and this continues until the material
has worked its way to the discharge end of the cylinder A, into the hollow rollers G
and H and to the discharge ends thereof, when the feed is adjusted and reduced to a
more moderate rate by turning the windlass e as described, in order to avoid clogging
and allow the cylinder and rollers to pulverize the first supply. The material
pulverized between the sectors F of cylinder A and roller G partly enters the grooves f
and is carried up until discharged therefrom by reason of the inclination of said
grooves, and in discharging upon the roller G the finer particles are freed from the
coarser portions by means of the draft of the fan j¹. The coarser and heavier particles
fall upon the roller G and pass through the openings g of the same into its hollow
interior and in contact with roller H, where they are again subjected to a pulverizing
action between rollers G and H.
The action of the fan ji upon the sufficiently pulverized material is to draw it toward
the rear end of the cylinder A. and out of it; while the insufficiently reduced portion
by reason of its weight and size accumulates between the head J and the rollers,
where it is dipped up by the arms i of the elevator I, delivered into the hollow
roller H, and by the screw is carried back to the feed end of the cylinder A to be
pulverized by again passing between the cylinder and the rollers G and H. The
roller H has no perforations such as the roller G at g, and therefore delivers all

page_text: the surplus material which is deposited into it by the elevator, to the feed end of the
cylinder A.
The material of coarse grade by thus being separated from the sufficiently pulverized
material and returned by the screw h, is kept from interfering with the discharge of
the said sufficiently pulverized portion by the fan draft; it being put in circulation
inside the roller H in a backward direction, and outside said roller in a forward direction,
and subjected in its forward movement to a further reducing action which brings it to
a condition for being discharged by the fan draft; in pulverizing with water, the fan j
and the head J are disconnected from the cylinder A and the water is introduced
through a suitable supply pipe at the feed end a** so as to assist in carrying the 1
material along to the discharge end rapidly. In this case the water-supply pipe J'
may or may not be dispensed with as desired.
In the use of the water supply at the feed end or both feed and discharge ends, the
wire gauze covered head J' is substituted for the head J, and the flowing water acts in
the same manner upon the pulverized material as the draft of the fan; that is, it carries
off and discharges the portions of the material reduced to the required fineness.
I sometimes use a small quantity of steam or water introduced into the feed end
of the cylinder to dampen the floating dust and thereby prevent injury to the
operatives.
The number of intermediato rollors between the cylinder A and back feeding
roller H, is not limited to one, as any number of rollers similar to roller G may be
inserted into each other and interposed between the cylinder A and roller H without
changing the principle of my invention; and as the roller H with its interior return
foed screw would operate just the same when in contact with the reducing surfaces of
cylinder A, as when in contact with roller G hence this roller H can be used without
the roller G without departing from the nature of my invention.
The corrugated portions of the rollers may be made in sections, similar to the
corrugated sectors F of the cylinder A and suitably fastoned to the main roller
bodies.
The pulverizer may also be made of any desirable length and the rollers G and H
duplicated and arranged in a continuous line without being coupled.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed as communicated to me
by my foreign correspondent I wish it understood that I claim
First. A pulverizing machine consisting of a hollow reducing cylinder and hollow
reducing roller, whereby stone or other substances are reduced to any desired fineness
and such portions of the substances acted upon as are not sufficiently reduced by the
time they arrive at the discharge end of the machine are returned to the feeding
end thereof and again introduced between the pulverizing surfaces, substantially as
described.
Second. The elevator for lifting the insufficiently pulverized substances and directing
them into the return feeding and crushing roller of the machine, substantially as
described.
Third. A crushing roller having an inner return feeding scrow for a pulverizing
machine, substantially as described.
Fourth. A pulverizing machine comprising the cylinder and a hollow roller having
an inner return feeding screw, said cylinder having an outlet head through which the
sufficiently pulverized materials are discharged while the coarser substances are
returned to the feed ond of the pulverizer, substantially as described.
Fifth. The pulverizing machine comprising a hollow reducing and return feeding
roller and a hollow reducing cylinder provided with annular bearings on its periphery
and a toothed rim, the said cylinder being supported by flanged rollers and driven by
a pinion on a shaft, substantially as described.
Sixth: The revolving reducing cylinder provided with the discharge head having

page_text: wire gauze coverings and a water pipe in combination with the revolving reducing
roller having an inner return feeding screw, substantially as described.
Seventh. A pulverizing machine combining the revolving reducing cylinder, a
feeding and checking screw in its feed receiving opening, a discharging head having
wire-gauze-covered openings and a water pipe and a revolving reducing roller having
an inner return feeding screw, substantially as described.
Eighth. A pulverizing machine combining a revolving hollow cylinder, one or more
inner hollow reducing rollers, a return foed screw, a feeding chute and means for
adjusting and agitating the said chute according as the requirements of the crushing
surfaces may demand, substantially as described.