An Improved Roller Mill, principally for Crushing Quartz, Mineral Ores, Tailings, and the like.
Year: 1897

page_text: Date of Application, 6th Dec., 1897
Complete Specification Left, 20th July, 1898-Accepted, 10th Sept., 1898
An Improved Roller Mill, principally for Crushing Quartz, Mineral
Ores, Tailings, and the like.
I, HENRY WILLIAMS TRELOAR, of Adair Street, Maldon, in the Colony of
Victoria, Blacksmith, do hereby declare the nature of this invention to be as
follows:-
This improved roller mill has been devised principally for crushing quartz,
mineral ores, tailings and the like and is specially adapted for disintegrating
tailings prior to their being treated by the cyanide process.
When roller mills are used for treating sand and similar materials their rolls
quickly become worn into grooves and are thus rendered useless.
According to my invention I construct the mill with a pair of horizontal rolls
one of which is made longer than the other and has an endwise reciprocating
motion imparted to it by a convenient device. The effect of this endwise move-
ment is to cause the rolls to wear more evenly than they otherwise would do
thus preventing to a large extent the grooving of the rolls, and at the same time
increasing the effective crushing power of the machine. Each of the rolls con-
sists of a tapering mandrel upon which is driven an outer casing or tyre of hard
steel which may also be keyed upon said tapering mandrel.
An endless carrier belt or conveyor wheel is arranged to deliver a regular
quantity of the material to be treated to the rolls and in order to prevent such
material passing out from between the ends of said rolls I mount a small wheel
one on each side of the mill so that its periphery bears against the end of the
shorter roll whilst its first side bears against the periphery of the longer and
reciprocating roll.
Dated this Twenty-sixth day of October One thousand eight hundred and
ninate caran
An Improved Roller Mill, principally for Crushing Quartz, Mineral
Ores, Tailings, and the like.
I, HENRY WILLIAMS TRELOAR, of Adair Street, Maldon, in the Colony of
Victoria, Blacksmith, 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 improved roller mill has been devised principally for crushing quartz,
mineral ores, tailings and the like and is specially adapted for disintegrating
tailings prior to their being treated by the cyanide process.
F
Pain 17

page_text: When roller mills are used for treating sand and similar materials their rolls
quickly become worn into grooves and are thus rendered useless.
According to my invention I construct the mill with a pair of horizontal rolls
one of which is made longer than the other and has an endwise reciprocating
motion imparted to it by a convenient device. The effect of this endwise move-
ment is to cause the rolls to wear more evenly than they otherwise would do
thus preventing to a large extent the grooving of the rolls, and at the same time
increasing the effective crushing power of the machine. Each of the rolls con-
sists of a tapering mandrel upon which is driven an outer casing or tyre of hard
steel which may also be keyed upon said tapering mandrel.
An endless carrier belt or conveyor wheel is arranged to deliver a regular
quantity of the material to be treated to the rolls and in order to prevent such
material passing out from between the ends of said rolls I mount a small wheel
one on each side of the mill so that its periphery bears against the end of the
shorter roll whilst its flat side bears against the periphery of the longer and
reciprocating roll.
In order that my invention may be clearly understood reference may be made
to the accompanying drawings wherein,---
Figure 1 is a side elevation, and
Figure 2 a plan of a roller mill constructed according to this invention.
The same letters of reference indicate the same parts in both figures.
AB represent the two horizontal rolls of which the former is somewhat longer
than the latter so that it may overlap it at each end and thus allow for the
endwise reciprocating motion which is imparted to it by means of an eccentric C
on the main shaft D through the medium of the bell crank lever c¹ and connect-
ing rod c².
To facilitate this endwise movement of the roll A its bearings a a are carried
on a plate a¹ supported upon rollers Don the upper surface of the bed-plate E
of the mill and in order that it may be adjusted to bear against the other roll
with any desired degree of pressure I arrange a stout carriage or other spring
or springs F so that it bears against the adjustable bearings a a and arrange a
set screw so that the tension of said spring or springs can be adjusted at will
as required.
The construction of the rolls of tapering mandrels having outer casings or
tyres of hard steel secured upon them will be readily understood from the draw-
ings, set screws (such as b) or other contrivances being used for securing said
casings or tyres upon said mandrels.
GG represent the small wheels which are mounted one on either side of the
roll B so that their peripheries bear against said roll whilst their flat sides bear
against the periphery of the roll A in order to prevent material falling out from
between the ends of said rolls.
Owing to the grooving of the rolls at present in use for crushing purposes
they must be kept close together by excessive and enormous pressure and they
must be driven at a comparatively slow speed.
On the other hand my improved rolls may be driven at a comparatively high
speed such as five hundred revolutions per minute and with but a fractional
part of the pressure between the faces required by ordinary rolls, whilst doing
equally good work.
It will be readily understood that the reciprocating motion may be imparted
to the roll at any given speed independently of the machine, that is it may be
driven from some outside source.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
1. The herein described roller mill principally for crushing quartz, mineral
ores, tailings and the like consisting essentially of two rolls to one or other of

page_text: which an endwise reciprocating motion is imparted substantially as and for
the purposes herein described and explained and as illustrated in the accom-
panying drawings.
2. In a roller mill a pair of rolls (such as A B) to one of which an endwise
reciprocating motion is imparted in combination with a pair of small wheels
(such as GG) bearing against the end of the shorter and the periphery of the
other roll substantially as and for the purposes herein described and explained
and as illustrated in the accompanying drawings.
3. In a roller mill a roll (such as B) in combination with a plate (such as a¹)
carrying another roll (such as A) and mounted upon horizontal rollers (such as I))
substantially as and for the purposes herein described and explained and as
illustrated in the accompanying drawings.
Doted this 20th day of July One thousand eight hundred and ninety-eight.