BROYEUR A ROULEAUX

ROLLER MILL

Abrégé anglais

ABSTRACT OF THE DISCLOSURE
A roller mill for grinding grain including two rollers having their
axes parallel to one another; each roller having a first constant diameter
along part of its length, a second smaller constant diameter along another
part of its length, adjacent to the part having the first diameter a groove
around the circumference at the junction of the two parts, and a partition
disposed at the junction of the two parts, the lower end of the partition
entering in the groove in each roller to separate grain being feed into the
roller mill so that large grain can be directed to the second smaller
diameter part of the rollers and small grain can be directed to the first
diameter part of the rollers.

Revendications

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A roller mill for grinding grain including two rollers
having their axes parallel to one another; each roller having a
first constant diameter along part of its length, a second
smaller constant diameter along another part of its length,
adjacent to the part having the first diameter a groove around
the circumference at the junction of the two parts, and a parti-
tion disposed at the junction of the two parts, the lower end of
the partition entering in the groove in each roller to separate
grain being fed into the roller mill so that large grain can be
directed to the second smaller diameter part of the rollers and
small grain can be directed to the first diameter part of the
rollers.
2. The roller mill of claim 1 including a drive pulley on
one end of one roller shaft, at the other ends of each roller
shaft, a belt drive between the pulleys at the other end of each
roller shaft and an adjusting means for adjusting the spacing of
the roller shafts.
3. The roller mill of claim 1 or 2 including a proportion-
ing mill for feeding grain in the required proportions to the
rollers,
4. A method of grinding two different sizes of grain
simultaneously for mixing into an animal feed consisting of
supplying one size of grain to one pair of rollers for grinding
therebetween and supplying another size of grain to a second
pair of rollers for grinding therebetween, both pairs of rollers
being mounted on a common pair of shafts.

Description

~ ~7565~3
This invention relates to a roller mill for crushing grain.
The prior art roller mills have two spaced rollers, the spacing
of which can be altered so that large grain such as corn can be accommodated
or smaller grain such as barley or oats can be accommodated. For feeding
animals there is a requirement for a feed mixture containing corn, barley
and oats. The proportions of the ingredients are obtained by a grain portion-
ing apparatus, however, when the spacing between the two rollers of the ro1-
ler mill is adjusted to satisfactorily grind barley or oats, the corn is
pulverized to a powder, whereas when the spacing between the rollers is
sized to satifactorily grind corn, the barley or oats passes between the
rollers without being ground. Corn, therefore, can not be processed at the
same time as barley and oats.
There is therefore a requirement to be able to grind measured
quantities of grain of different sizes in one roller mill to achieve a mixed
ground feed.
In this invention, the roller mill i5 provided with i~entical
rollers, with one part of each roller being of one diameter and another part
being of a slightly smaller diameter. A partition is provided at right
angles to the roller axis at the intersection of the large and small dia- -
meters for guiding a large size grain to the smaller diameter roller part
and small slze grain to the larger diameter roller par~. Two different
roller grinding surface spacings can therefore be utilized at one time with
the one setting of the roller mill and hence large and small grain can be
ground at the same time.
Preferably, a groove is undercut at the junction of the large
and small diameters so that the lower end of the partition can enter the
groove on each roller and provide a good separation of grain before grind-
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ing.
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The invention will now be deseribed with reference to theaccompanying drawings in which:
Figure 1 is R plan view of an embodiment of the rollers of
the roller mill of this invention;
Figure 2 is a side elevational view of the rollers of Figure
l;
Figure 3 is a front elevational view, partly in section, of
a feed proportioning apparatus including the roller mill of this invention;
Figure 4 is a side elevational view of the drive for the
roller mill of Figure 3; and
Figure 5 is a side elevational view of the opposite end of
the roller mill to that as shown in Figure 4.
Referring to the drawings, one embodiment of the roller mill
consists of a pair oE rollers 1 and 2 arranged on parallel axis on driven
shafts 3 and 4.
The diameter of the rollers is larger at one end than the
other, the larger diameter being indicated by B and the smaller diameter
by C. A groove 5 is undercut between the large diamet~r and the small dia-
meter on each roller and a partition plate 6 is secured above the rollers
such that the lower end of the plate enters the groove S and provides a
positive separation between the large and small diameters of the rollers.
The roller mill can conveniently be used with a proportioning
apparatus the outline of whlch is shown in Figure 3, the largest size
grain coming from proportioning unit 7 and possibly 8 and the smaller
size grains coming from units 9 and 10 and possibly 8, the disposition of
the grain through unit 8 depending upon the position of the hinged plate
11. The proportioning apparatus and hinged plate 11 is known in the art
aod d~ e5 not form part ot this invention.
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v ~5651~3
The drum roller mill is driven by a conventional drive as
shown schematically in Figures 4 and 5, the main drive pulley 12 driving
one roller which in turn drives the other roller through pulleys 13 and 14
and the belt 15, utilizing an idler pulley 16. Adjusting mechanism 17
which is well known in the art, is used to adjust the spacing of the rollers
which is done by varying the distance A of Figure 2.
Although the rollers of this mill have been shown as having
two different diameters, it is conceivable that, if there are more than
two different sizes of grain to grind, more than two different diameters
on the rollers could be used in the mill.
It is thus seen that this invention provides a roller mill
which is efficient in operation and enables the grinding of different sizes
of grain in one operation.