FIELD OF INVENTION
The present invention relates to a dust extraction system in a swing grinding
machine. More particularly, the invention relates to a system of extracting dust
from a swing grinding machine to keep the surroundings clean and to guard
against the pollution of the atmosphere.
BACKGROUND OF THE INVENTION
A swing grinding machine is a crushing machine and is used to crush the
materials which are needed in powder form. The sample is crushed to powder
form in the grinding pot which consists of one hammer and a ring. The sample is
subjected to continuous hammering to the ring and side of the pot as the pot
vibrates which results in fine powder of samples.
Chemical analysis of ores, fluxes and slag require the sample to be converted to
fine powder for the purpose of uniformity of the sample and to enable the
chemist to proceed for the testing by either wet chemical or instrumental
methods of testing. The sample received in the form of lumps or powder of
larger particle size are further crushed to the required mesh size using swing

grinding machines which guarantee high degree of reproducibility of preparation
of samples.
These machines are provided with controls which allow the operator to grind for
required period of time. Although the grinding pots are provided with O-rings to
prevent the sample powder from falling on the surrounding area of the grinding
machine, sample in the form of fine particles is noticed when the machine is
used continuously and in all shifts.
These swing grinding machines do not have dust extraction system. As a result,
the fine particles accumulates on the plate surrounding the pot of the swing
grinding machine and are cleaned with a brush by a operator. This leads to
accumulation of dust on the floor surrounding the machine and thus pollutes the
atmosphere leading to the risk of inhalation of the same by operator.
Hence, there exists a need to find a system which can overcome this problem.
OBJECTS OF THE INVENTION
Therefore, it is an object of the invention to propose a dust extraction system in
a swing grinding machine which prevents the accumulation of dust on the
machine and on the floor.

Another object of the invention is to propose a dust extraction system in a swing
grinding machine which extracts the accumulation of dust out of the machine
without polluting the environment.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig.l - shows the adaptation of exhaust fan behind the grinding pot of the
machine
Fig.2 - shows the steel tube connected at the back side of the grinding machine
and to the box containing water
Fig.3 - shows a line diagram of the system
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE
INVENTION
During crushing of ores, fluxes and slag on a swing grinding machine, powder in
the form of fine particles accumulates on the plate surrounding the pot of the
machine. This powder from the plate is sucked out by an extraction system and
collected inside a box containing water which can be emptied from time to time.
The actual working material is inside the grinding pot which is closed using a
cover of pot fixed with a 'O' ring. The material will not come out of the pot
unless cover is opened.

As shown in Fig.3, a hole (4) of diameter for example 12 cm is made on the
plate at the back side of grinding machine (5) behind the grinding pot. An
exhaust fan (11) is fixed to this hole. A steel tube (2) of diameter for example 24
cm which is larger than the hole (4) diameter is connected to the grinding
machine (5) that fits into the hole (4) and surrounds the exhaust fan (1). The
fitting of the tube (2) into the hole (4) is made in such a way that there is no
leakage of the powder in the atmosphere. The end of the tube (2) is made
slightly tapered for a better fitting into the hole (4). The other side of the tube
(2) having a flange of at least for example 30 cm diameter is bolted to a
collection box (3) containing water. The water in the collecting box allows the
dust to settle. The tube carries the dust. The dust mixed water from the
collecting box (3) is drained out from time to time. The accumulated dust is thus
extracted by the exhaust fan (1) and goes to the collection box (3) through the
steel tube (2) preventing pollution of the atmosphere and the working
environment.

WE CLAIM
1. A dust extraction system of a swing grinding machine, the said system
comprising;
at least one exhaust fan (1) being fixed to a hole (4) at the back of the
machine (5) for sucking the powder;
at least one steel tube (2) being fixed at the back of the machine (5)
surrounding the hole (4) for carrying the dust; characterised in that at
least one collection box (3) being fitted to the other end of the said tube
(2) by a flange (6) collects the dust.
2. A dust extraction system of a swing grinding machine as claimed in claim
1, wherein the hole (4) on the machine is of at least 12 cm diameter.
3. A dust extraction system of a swing grinding machine as claimed in claim
1, wherein the collecting box (3) contains water.
4. A dust extraction system of a swing grinding machine as claimed in claim
1, wherein the steel tube (2) is of at least 24 cm diameter.

5. A dust extraction system of a swing grinding machine as claimed in claim
1, wherein the flange (6) is of at least 30 cm dia.
6. A method of extracting dust of a swing grinding machine comprising the
steps of:
sucking the powder by an exhaust fan (1) into a steel tube (2);
carrying the dust through the said tube into a collecting box (3);
characterised in that the said collecting box contains water to settle the
dust.

A dust extraction system of a swing grinding machine consists of an exhaust fan (1) fixed to a hole (4) made on the back side of the machine (5) and a steel tube (2) with a tapered end is fixed to the said hole (4). The other end of the tube (2) having a flange is bolted to a collecting box (3) containing water which collects the extracted dust.