Improvements in Roller Mills for Crushing Ores and other Substances.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Roller Mills for Crushing Ores and other Substances.
I, JOHN LAW KIRKBRIDE, of Sentinel Road, Ponsonby, Auckland, New Zealand,
Settler, do hereby declare the nature of my said invention to be as follows:-
.
My invention has for its object, improvements in rolling mills for crushing ores
and other substances, by which I evenly distribute the ore or other substance
between the rolls and also mix the hard ore with the soft which prevents the rolls
from being unevenly worn.
In carrying my invention into practice I mount the rolls in bearings carried
by a suitable framework and between the ends of these rolls and the framework I
fix two curved plates of nearly the same radius as the rolls so that the ore can
traverse beyond the length of the rolls as it is ground. Also attached to the sides
of the framework, between the ends of the rolls are two moveable side plates which
push the ore off the curved plates on to the rolls for the purpose of keeping the ore
alive and these moveable plates are operated by a catch or stop piece attached to
the inner side of one of the gear wheels, which, as the wheels revolve comes into
contact with a projecting piece attached to the moveable side plates thereby moving
them inwards.
Arranged in any desired manner above the rolls is a distributor, which is caused
to travel backwards & forwards between the rolls, amongst the ore, by suitable
means thus evenly distributing the ore as well as mixing the hard ore with the soft
which prevents the surface of the rolls from being unevenly worn. Friction plates
may also be attached to the ends of the rolls to prevent them from being damaged
by the friction of the curved plates or any fine ore which may get between the
plates and the sides of the drums.
"
At the mouth of the stage or hopper I fix a number of bars or their equivalent
at equal distances apart to suit the size of ore to be crushed which has previously
been broken in the stone breakers in the usual manner so as to prevent any foreign
substances such as gads or tools which are frequently left amongst the ore by
the miners from getting between the rolls. I may also fix a fluted roller at the
bottom of the stage or hopper to prevent any larger pieces of ore from passing on
to the rolls.
5
1007

page_text: Improvements in Roller Mills for Crushing Ores and other Substances.
I, JOHN LAW KIRKBRIDE, of Sentinel Road, Ponsonby, Auckland, New Zealand,
Settler, do hereby declare the nature of my said 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 has for its object, improvements in rolling mills for crushing ores
and other substances, by which I evenly distribute the ore or other substance
between the rolls and also mix the Hard ore with the soft which prevents the rolls
from being unevenly worn.
In carrying my invention into practice I mount the rolls in bearings carried
by a suitable framework and between the ends of these rolls and the framework I
fix two curved plates of nearly the same radius as the rolls so that the ore can
traverse beyond the length of the rolls as it is ground. Also attached to the sides
of the framework between the ends of the rolls are two movable side plates which
push the ore off the curved plates on to the rolls for the purpose of keeping the ore
alive and these moveable plates are operated by a catch or stop piece attached to
the inner side of one of the gear wheels which as the wheels revolve come into
contact with a projection piece attached to the moveable side plates thereby moving
them inwards.
Arranged in any desired manner above the rolls is a distributor, which is caused
to travel backwards and forwards between the rolls, amongst the ore, by suitable
means thus evenly distributing the ore and as well as mixing the hard ore with the
soft which prevents the surface of the rolls from being unevenly worn. Friction
plates may also be attached to the ends of the rolls to prevent them from being
damaged by the friction of the curved plates or any fine ore which may get between
the plates and the sides of the drums.
«
39
At the mouth of the stage or hopper I fix a number of bars or their equivalent
at equal distances apart to suit the size of ore to be crushed which has previously
been broken in the stone breakers in the usual manner so as to prevent any foreign
substances such as gads
or tools which are frequently left amongst the ore by
the miners from getting between the rolls. I may also fix a fluted roller at the
bottom of the stage or hopper to prevent any large pieces of ore from passing on
to the rolls.
In order that my invention may be more clearly understod and easily carried into
practical effect I have appended hereunto a double sized sheet of drawings upon
which I have illustrated examples of my improvements.
Figure 1 is a perspective view of my improved rolling and crushing mill.
Figure 2 is a similar view to Figure 1 with the front of the cover J which
encloses the screw shaft H for keeping dust or dirt off the crew removed.
Figure 3 is an elevation of the shield or wing plate.
Figure 4 shews a modification of Figure 3.
Figure 5 is a plan view of Figure 4.
Figure 6 is a perspective view of the moveable bottom or slide.
Figure 7 is an inverted perspective view of the false shields.
In carrying my invention into practice I mount the rolls A and A¹ in suitable
bearings carried by the framework B and between the ends of these rolls and the
framework I fix the shields or wing plates D and D¹. These shields or wing plates
fit accurately against the sides of the rolls and are preferably made of cast iron
hollowed underneath so that if any grit or other substance gets between the rolls
and the shield it will easily pass through. The shields or wing plates are fixed to
the frame d by the bolts d³ and these frames are provided with the slots d' so

page_text: that the wing plates can be adjusted as the rolls wear away by unlocking the
bolts do which pass through these slots and secure the frames to the sides of the
framework or mill. Or I may cast the frame and the shields in one piece and in
some cases dispense with the lower part of this frame and fix the wing plates to the
sides of the mill by bolts passing through the wing plates. By making the wing.
plates adjustable they can be used for a considerable time, but as the rolls continue
to wear duplicate shields of a smaller diameter are substituted; and the wing plates
may be adjusted against the rolls by inserting packing pieces or the like between
the frame and the framework B or these wing plates may be adjusted laterally in
any other suitable manner. The width of these shields or wing plates is in every
case determined by the size of the rolls. In the method as shown at Figures 4.
and 5 I form these shields or wing plates in two parts do and d, the front part d'.
is bolted or otherwise secured to the part de. By this arrangement the front part
or outer section which is the part that requires to be renewed most frequently can
be renewed without having to sacrifice the whole of the wing plates.
In order that the material under treatment may be continually agitated and
evenly distributed along the whole length of the rolls I may arrange the traverser
or distributer E which is made to continually move to and fro between the rolls.
This distributer is preferably shaped on the inside face as shewn at Figure 9:
or it may be diamond shape and it is fixed by means of the nut e¹ to the collar or
slide F which is preferably formed in two parts and mounted upon the screw
shaft H. This shaft which is mounted in the cover J above the rolls in a position.
to bring the distributor immediately or approximately, above the line of contact.
of the two rolls has a reversing screw thread cut upon it-that is-continuous right
and left hand threads intersecting each other and united at their ends so that as
the shaft continually revolves in the one direction in its bearings h¹ and h² the.
collar or slide which engages in the threads will traverse and re-traverse the
shaft H, thus when the ore is introduced through a hopper which may be situated
at any convenient position above the rolls, it is kept in a continuous state of
agitation and evenly spread along the rolls by the lateral movement of the distri-
butor which when crushing fine ore traverses beyond the ends of the rolls on to
the shields or wing plates. The bottom j¹ of the cover J through which the distri-,
butor passes and with which it slides to and fro is made movable so as to effectually
exclude all dust and grit.
In order that coarse ore or the like may be agitated without risk of damage to:
the distributor I form the screw shaft so that the distributor traverses the width
of the rolls only, and to prevent the ore forming into a solid mass on the shields or
wing plate against the sides of the mill and to keep the ore alive on the shields
and edges of the rolls I provide the false shields N. & N¹. These false shields
are connected together by the bar n¹ and are capable of being moved laterally by
the prongs and which are fixed to the underside of the moveable slide of
bottom. This bottom j¹ is moved as the distributor travels to and fro so that
when the distributor is approaching the false shield N the prong comes in contact
with this false shield and pushes it along thereby drawing the other false shield N¹
with it, consequently any ore on the wing plate D would be pushed on to the
rolls, in the same manner when the distributor travels in the opposite direction
the false shield N would push the ore off the wing plate D on to the rolls.
When the ore has been reduced to coarse sand the false shields may be removed,
a longer screw used and the traverser run the full width.
The distributor or traverser may be operated by other means in place of the revers-
ing screw, as for example I may use fast and loose pulleys and belts, and cross
one of the belts as required, or the distributor may be operated as shewn at Figure 8.
In this case I mount the collar P or its equivalent which carries the distributor
on the screw shaft S. The top end p' of this collar slides loosely on the sliding
shaft or guide rod T between the stop collar t¹ and . It will thus be seen that
when the end p comes in contact with the stop collar 12 as it travels along the
screw shaft that it will move or slide the guide rod in its bearings by which means

page_text: the strap fork 3 will transfer the strap from the fast pulley V on to the loose
pulley V¹ and the strap fork t* will transfer the strap from the loose pulley V2 on to
the fast pulley V³ and as the strap which drives this pulley is crossed it will reverse
the motion of the shaft thus causing the traverser to travel back again until the
end p¹ comes in contact with the stop collar when the motion will be again
reversed.
For convenience of getting at the various parts I prefer to make the hopper
so that it may be readily slid backwards upon the frame of the mill or on top
of the bearings, or fixed in hinges so that it may be tipped out of the way.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed I declare that what I
claim is:-
First: The improvements in rolling mills for crushing ores and other substances
consisting essentially of the shields or wing plates such as D and D¹ made in one
or more parts and fixed between the ends of the rolls to the sides of the mill the
traverser or distributor such as E or its equivalent capable of being moved to and
fro between the rolls either with or without the false shields such as N in the
manner and for the purpose substantially as herein set forth and as shewn upon
the accompanying sheet of drawings.
Second In rolling or rolling and crushing mills fixing between the ends of
the rolls and the sides of the mill adjustable shields or wing plates such as D and
DI in the manner and for the purpose substantially as herein set forth and as
shewn.
Third In rolling or rolling and crushing mills a traverser or distributor such
as E or its equivalent mounted immediately or approximately above the line of
contact of the rolls and capable of moving to and fro in the manner and for the
purpose substantially as herein set forth and as shewn.
Fourth In rolling or rolling and crushing mills the false shields such as N or
their equivalents mounted above the shields or wing plates and operated by the
prongs or projecting pieces 13 or their equivalents in the manner and for the
purpose substantially as herein set forth and as shewn upon the drawings.
Fifth In rolling or rolling and crushing mills the movable bottom such as j¹
having prongs or projections on the underside for operating the false shields in the
manner substantially as herein set forth and as shewn upon the drawings.
Dated this 20th day of October 1897.
GEORGE BARKER,
Agent for Applicant, 77, Colmore Row, Birmingham.
GEORGE BARKER,
Agent for Applicant, 77, Colmore Row, Birmingham.