Improvements in and relating to Grinding and Separating Machinery.
Year: 1895

page_text: Date of Application, 9th May, 1895
Complete Specification Left, 10th Feb., 1896-Accepted, 18th Apr., 1898
PROVISIONAL SPECIFICATION.
Improvements in and relating to Grinding and Separating
Machinery.
I, PERCY JOHN NEATE, of 268, High Street, Rochestor, in the County of
Kent, Engineer, do hereby declare the nature of this invention to be as
follows.-
My invention relates to machinery for comininating hard and dense substances
such as cement clinker, and has for its object the better grinding, and sepaintion of
the fine from the coarse particles to be automatically retined to the grinding
mill and reground until they are of required fineness, and to generally effect greater
efficiency in the process of comminution or reduction of material
In my improved machine 1 employ edge runners evolving on their axles and
constructed and mounted in the known manner upon a cential casting
These are
duven around an mclined ginding path set at suitable distance above the bed of
the mill and manged in the usual way. The whole mill is enclosed in a casing, to
the centre of which at the top the crushed material is fed.
According to my present improvements 1 cause the feed and returned tailings to
fall vertically upon a rotary cone ou disc by which it is thrown outwardly against
the mill casing and is deposited and temporarily sustained upon and by a concave
cone arranged around the upper and outer edge of the grinding path Its descent
therefrom is likewise arrested for a sufficient time by the action of rotating scrapers
supported and duiven by the cential rotary casting.
In order to further comminute the delivery herefrom 1 temporarily detain the
particles within the sphere of action of the runners and scrapers by providing upon
the bed plate at a certain distance belon the base of the grinding path an annular
flat mg or depositing shelf. The situation and width of this are such as to
etain the falling particles in such manuer that the larger portion of the load
may be again caught up by the revolving scrapers and reground, whilst the rest
omer particles work down the bed inwardly to the shoots leading to the
elevator pit, whence they are returned to the rotary feed cone with or without further
sifting or an separation. The scrapers thus exercise to some extent a selective
function.
Foi separating particles of different weights I employ a fan, and the novelty of
this part of my invention lies in the following special construction and disposition of
his fan.
In order to increase lineal velocity I employ an annular iotary fan surrounding
the uppermost part of the whole mill casing, and itself enclosed in a deep closed
chamber. This is exterior to the mill casing, and let orifices are formed leading
therefrom to the upper part of the fan at the uppermost part of the mill above the
gunding path, and outlet oufices are also formed leading from the chamber to the
ll below the grinding path, said outlet orifices being provided with suitablo dust
Deflectors in the chamber. Thus I secure a double passage of air through the
material during comminution, re, both above and below the gunding path, and this
ir current serves to cairy off the finer particles and deposit same upon the base of
he tau chamber which forms a settling space.
I do not limit myself to any particular duection of the cnculating current which
may be upwards through the mill and downwards through the fan casing or
ice versa, the deflectors being appropriately arranged.

page_text: To deliver deposits from the fan chamber to the warehouse I may employ in
combination with the fan and chamber and at the bottom of the latter an undulating
floor or a series of reversed inclined planes, at the lowest parts of which are formed
collecting pockets traversed by conveyors, preferably woims, by which the finished
material is conveyed away, or equivalently I may employ slow moving scrapers
adapted to traverse a flat base of the fan chamber and sweep the deposits into a
spout to be similaily dealt with. In constincting the fan the pitch of the blades
16 made adjustable and reversible so as to secure variable power for regulating the
fiueness of the output.
1005
Improvements in and relating to Grinding and Separating
Machinery.
I, PERCY JOIN NEATE, of 268, High Street, Rochester, in the County of
Kent, 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:—
My invention relates to machinery for comminuting hard and dense substances
such as cement clinker, and has for its object the better grinding and separation of
the finer from the coarser particles of the materials during grinding, and to cause
the coarse particles to be automatically returned to the grinding mill and reground
until they are of required fineness, and to generally effect greater efficiency in the
process of comminution or reduction of material.
In fully describing my improvements I will refer to the accompanying drawings
which illustrate a grinding mill embodying same.
Fig. 1 is a central vertical section partly in elevation; Fig. 2 a plan on line A-B
of Fig. 1 of a mill showing my improvements; and Fig. 3 a part side elevation
of fan.
In my improved machine I employ edge unneis such as R R revolving on then
axles, and constructed and mounted in the known manner upon a central iotary
casting C. They are driven around a grinding path such as P' set at suitable distance
above the pan B of the mill, by power applied to the diving pulley W or otherwise
conveniently and arranged in the usual way. The whole mill is enclosed in an
outer casing M, to the centre of which at the top the crushed material is fed through
a shoot S.
According to my present improvements 1 cause the feed and returned tailings to
fall vertically upon a rotary cone or disc D by which the same is thrown outwardly
against the inner mill casing m and is deposited and temporarily sustained upon
and by a shelf a running around the upper edge of the ginding path P. Its
descent therefiom is likewise arrested for a sufficient time by the action of iolating
scrapers such as but not necessarily the same as shown at a supported and diven
by the cential rotary casting C.
In order to further comminute the delivery therefrom 1 temporarily detain the
particles within the sphere of action of the unners R and scrapers & by providing
upon and around the pan B at a certain distance below the base of the grinding
path Pan annulai ning or depositing shelf which is preferably flat but may be
slightly inclined. The situation and width of this are designed to retain the falling
particles in such manner that the larger particles of the load may be agam caught
up by the revolving scrapers & and reground, whilst the rest or finer particles will
work down the pan B inwardly and be swept by the ploughs P' to the shoots c

page_text: which lead to the usual elevator pit, whence they are returned to the lotary feed
cone with or without further sifting or air separation; the scrapers thus exercise
to some extent a selective function."
For separating particles of different weights I employ a fan, and the novelty
of this part of my invention lies in the following special construction and disposition
of this fan.
In order to increase lineal velocity I employ an annular rotary-fau F carried by
arms F driven by the central spindle. The fan is enclosed in a deep closed
chamber N surrounding the mill and formed by the outer casing M and an inner
open-topped casing m, and it is preferably disposed as shown at or near the top part
ol said chamber N. The lighter material is blown up over the top of the said
inner casing m as indicated by the full arrows and falls into and through the
annulus of the fan Fabove the grinding path. Outlet orifices o are formed
leading from the lower part of the chamber N to the mill below the grinding path,
said orifices being provided with suitable dust deflectors such as d in the chamber N,
and if desired with perforated screens. Thus I secure a double passage of air
through the material during comminution, e, both above and below the grinding
path, and this air current serves to carry off the fiuer particles and deposit same
upon the base f' of the fan chamber which forms a settling space.
I do not limit myself to any particular direction of the circulating current, which
may be upwards through the mill and downwards through the fan casing as
indicated by the full arrows, or vice versa as indicated by the dotted arrows, the
deflectors d'being appropriately arranged.
For this purpose in constructing the fan F the pitch of the blades is made
adjustable and reversible so as to secure variable blast power for regulating the
fineness of the output.
In order to manipulate the fan as and when required I make it of two rings ƒ³ƒ'
adjustable horizontally in regard to one another. The construction 18 clearly shown
Fig. 3 in which the lower ring f' is shown broken, the part to the night being
raised higher than that to the left. They are connected together by a convenient
number of suitably spaced two-part distance links such as K K adjustable us to
their lengths by the usual right and left hand threads, uut k, and locks nuts ;
in the upper ring are provided a number of alternative holes" for adjustment of
position of said links K The blades or vanes V V are coupled to the rings by
pins as shown, and they are made flat and of sufficient resiliency to bend or
twist slightly as the ings are rotated in either direction, and thus form more or less
perfect helical surfaces. Thus by altering the relative position of the rings the
pitch of the blades will also be adjusted to cause thein to create an upward
or downward air current of such velocity as may be required and as above
indicated.
To deliver deposits from the fan chamber to the warehouse I may employ in
combination with the fan and chamber and at sufficient distance (depending upon
the nature of the material) below the apertures o o au undulating floor or a series
of reversed inclined planes as indicated by dotted lines LL, at the lowest parts of
which are formed collecting pockets E traversed by conveyors T, preferably worms
as shown, by which the finished material is conveyed away. I find it a convenient
construction to arrange these pockets E above and leading into the hollow
supporting columns Q Q, and to enclose the worms so that no dust escapes.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim 18-
1. In a grinding mill having revolving runners and scrapers rotated around a
grinding path, the use of a rotary leed distributing cone or diso such as D and an
aunular stationary shelf a surrounding the mill casing at the top of the grinding
path, substantially as and for the purposes above specified.
2. In a grinding mill such as above referred to, the arrangement of an annular ring

page_text: or depositing shelf at a certain distance below the grinding path in combination
with rotary lifting sciapers such as &, as and for the purpose set forth.
3 In a grinding and separating mill such as is above referred to, the arrangement
of a rotary annular fan in a deep closed chamber surrounding the mill and having
communicating inlet and outlet orifices respectively above and below the grinding
path whereby a double passage of air at suitable velocity and in either direction
through the material during comminution may be effected, substantially as and for
the purpose set forth.
4 The use in connection with grinding and separating machinery such as above
referred to of an annular fan constructed with adjustable blades, and disposed or
adapted to operate substantially in the manner set forth.
5. The arrangement in combination with a rotary fan disposed in a closed
chamber in the manner above referred to of an undulating base to the fau chamber
having oufices at the lowest points leading to pockets traversed by conveyors,
substantially as and for the purpose above described and illustrated.
6. The arrangement of a grinding and separating mill embodying my above
specified improvements separately or collectively, and substantially as described
and illustrated in the accompanying drawings.
HOZANA
Poruncy του.
For the Applicant,
J. C. CHAPMAN,
70, Chancery Lane, London, W.C., Chartered Patent Agent.