Improvements in Grinding or Crushing Mills.
Year: 1899

page_text: Date of Application, 28th Nov., 1899
Complete Specification Left, 11th Aug., 1900-Accepted, 6th Oct., 1900
PROVISIONAL DITUITUATIA.
Improvements in Grinding or Crushing Mills.
I, RUDOLPHE BAUMANN, of 23, Glacis de Rive, Geneva, in the Republic of
Switzerland, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to improvements in grinding or crushing mills for the
pulverization of hard substances.
My improved crushing mill is characterized by its having a main
chamber divided into two superimposed compartments, the upper one being
intended to contain the grinding-rollers, and the lower one being intended to
contain the joints in combination with suitable devices for causing a current
of air to ascend from the lower compartment into the upper one so as to prevent
the falling down of the material to be ground or pulverized into the said lower
compartment, where it would be liable to become contaminated by the grease
contained therein, and would moreover tend to cause the said joints to rapidly
wear out and also cause the pulverulent to be blown out of the machine.
Through the centre of the shell or outer casing of the mill passes a vertical
shaft, which is adapted to rotate at a high speed either by means of a pulley
and belt, or by any other suitable device.
At the upper end of the said shaft is affixed a disk, supporting two or more
rollers, mounted on vertical spindles.
These rollers are connected with the disk by means of two joint-levers, and
the spindles supporting the rollers traverse the disk through suitable oblong
apertures, so as to enable the rollers either to approach the centre of the disk
or to recede from it.
Whilst the disk is revolving, the material which is to be pulverized, is intro-
duced through an orifice or hopper into the mill-chamber, where the same is
pulverized between the rollers and a fixed annular grinding surface, because
these rollers, owing to centrifugal force, are continually pushed towards and
against the said annular grinding surface.
During this process, the rollers will, more or less, approach, the annular
grinding surface or recede from it, according to the density of the layer of
the material to be pulverized.
The principle feature of my invention consists in the fact, that the main
chamber of the mill is divided into two separate compartments, one being
situated above the other.
In the upper division are the grinding rollers, and the stationary annular
grinding surface and in this compartment the pulverization of the material
takes place.
In the lower compartment are the joints of the levers which support the
spindles of the rollers. Whilst the mill is working, a strong current of air is
introduced through a suitably arranged tube by means of a blower or of other
suitable device. This current of air serves, firstly to prevent the falling of
the pulverized material into the lower compartment owing to the air pressure
around the disk and through the oblong apertures before mentioned and
secondly serves to eject the pulverized material after it has attained the requisite
degree of fineness, through an outlet tube of the machine.

page_text: The spindles and joints which are in this manner protected against contact
with the material to be pulverized, can thus be lubricated without danger of
soiling the pulverized material, and will therefore remain in good working
order.
The arrangement which prevents the contact of the material to be pulverized
contained in the chamber, with the joints, prevents also the mixing of the
lubricant that has served to grease the joints, with the same..
It is this particular arrangement of the mill, by which the principal chamber
is divided in two compartments, which distinguishes my apparatus from other
existing pulverizing machine known to me, in which the joints of the rollers
are in contact with the material to be ground, which offers two great disadvan-
tages, namely:-
The spindles and joints of the rollers are very quickly worn out, which
renders their employment difficult, and the material to be ground is soiled,
which in many cases, as for instance, in cement-mills, is a serious disadvantage.
Thatod this 9841
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
I, RUDOLPHE BAUMANN, of 23, Glacis de Rive, Geneva, in the Republic of
Switzerland, 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 improvements in grinding or crushing mills for the
pulverization of hard substances.
My improved crushing mill is characterized by its having a main
chamber divided into two superimposed compartments, the upper one being
intended to contain the grinding-rollers, and the lower one being intended to
contain the joints in combination with suitable devices for causing a current
of air to ascend from the lower compartment into the upper one so as to prevent
the falling down of the material to be ground or pulverized into the said lower
compartment, where it would be liable to become contaminated by the grease
contained therein, and would moreover tend to cause the said joints to rapidly
wear out and also cause the pulverulent material to be blown out of the
machine.
The accompanying drawings show one form of crushing mill constructed in
accordance with my invention and I will now fully describe the same, reference
being made to the said drawings in which;
Figure 1 is a vertical section on line VX of Figure 3.
Figure 2 is a vertical section on line YZ of Figure 3, and
Figure 3 is a horizontal section of the machine.
Through the centre of the shell or outer casing of the mill passes a vertical
shaft C, which is adapted to rotate at a high speed either by means of a pulley
and belt, or by any other suitable device."
At the upper end of the said shaft C is affixed a disk D supporting to or
more rollers E and E' mounted on vertical spindles I.
These rollers are connected with the disk D by means of two joint-levers H
and H, and the spindles I supporting the rollers traverse the disk D through
suitable oblong apertures i and ¹, so as to enable the rollers either to approach
the centre of the disk or to recede from it.

page_text: Whilst the disk 1) is revolving, the material which is to be pulverized, is
introduced into an orifice or hopper L through the funnel Q into the mill-
chamber, where the same is pulverized between the rollers E and E and the
grinding surface of a fixed annular ring F, the rollers, owing to centrifugal
force, being continually pushed towards and against the said annular grinding
surface F as will be readily understood.
During this process, the rollers will, more or less, approach the annular
grinding surface or recede from it, according to the density of the layer of the
material to be pulverized.
The principle feature of my invention consists in the fact, that the main
chamber of the mill is divided into two separate compartments A and B, one
being situated above the other.
In the upper division A are the grinding rollers E and E¹, and the stationary
annular grinding-surface F and in this compartment the pulverization of the
material takes place.
In the lower compartment B are the joints G and G of the levers H and H¹
which support the spindles I and I¹ of the rollers. Whilst the mill is working,
a strong current of air is introduced through a suitably arranged tube M by
means of a blower or other suitable device. This current of air serves, firstly
to prevent the falling of the pulverized material into the lower compartment B
owing to the air pressure around the disk D, and through the oblong apertures i
and before mentioned; and secondly serves to eject the pulverized material
through the tube N after it has attained the requisite degree of fineness.
The spindles I and I, and joints G and G¹, which are in this manner pro-
tected against contact with the material to be pulverized, can thus readily be
lubricated without danger of soiling the pulverized material, and will therefore
remain in good working order.
The arrangement which prevents the contact of the material to be pulverized
contained in the chamber A, with the joints, prevents also the mixing of the
lubricant that has served to grease the joints, with the same.
It is this particular arrangement of the mill, by which the principal chamber
is divided in two compartments, which distinguishes my apparatus from other
existing pulverizing machines known to me in which the joints of the rollers
are in contact with the material to be ground, which offers two great dis-
advantages, namely:
The spindles and joints of the rollers are very quickly worn out, which
renders their employment difficult, and; the material to be ground is soiled,
which in many cases, as for instance, cement-mills, is a serious disadvantage.
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-
-
A crushing-mill with vertical shaft and blower, in which its principal chamber
is divided into two compartments one situated above the other, in such a manner
that the grinding-rollers are in the upper compartment and the joints in the
lower one, in combination with means whereby an ascending current of air is
introduced, so preventing the falling of the material to be ground into the lower
compartment; thus preventing the rapid wearing out of the joints and soiling
of the material to be ground, by the material used for lubricating the machinery,
substantially as hereinbefore described and illustrated by the accompanying
drawings.
Dated this 11th day of August 1900.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C..
Agents for the Applicant.