IMPROVED TROMMEL ASSEMBLY
FIELD OF THE INVENTION
The present invention in general relates to a trommel screen assembly and more
particularly to an improved trommel screen assembly comprising modular screen
assembly of substantially less weight which is scalable, easy to transport and easy to
assemble.
BACKGROUND OF THE INVENTION
A trommel (from the german word for drum), is a screened cylinder used to separate
materials by size - for example, separating the biodegradable fraction of mixed
municipal waste or separating different sizes of crushed stone.
Trommels or revolving screen is one of the oldest screening devices, which is a
cylindrical screen typically rotating at between 35 % and 45 % critical speed.
Trommels are installed on a small angle to the horizontal or use a series of internal
baffles to transport material along the cylinder. Trommels can be made to deliver
several sized products by using trommel screens in series from finest to coarsest.
Portable trommels (also called portable trommel screens) are often used in the
production of organic products from various types of waste.
For example, excavation contractors may screen their site debris into two fractions;
a saleable topsoil for farms, nurseries and site-work, as well as cleaned rock for
aggregates or landscaping work. This allows the contractor to resell their waste,
instead of incurring the cost of sending it for disposal.
Trommels remain widely used in some screening duties including aggregate
screening plants and the screening of mill discharge streams. AG, SAG, and ball mill
discharge streams. AG, SAG, and ball mill discharge streams usually pass through a
trommel screen attached to the mill outlet to prevent ball scats from reaching
subsequent processing equipment and to prevent a build-up of pebbles in the mill.
Though the use of trommel in several industries like gold mine or separating
biodegradable in wash plants is common in art, however, those available have been
found complicated and expensive as well and difficult to transport due to its heavy
weight. As a result, many obstacles come across during transportation through
shipping by water or by air.
Accordingly, there is a long felt need to provide an improved trammel assembly
which is scalable, easy to transport and easy to assemble is of substantially low
weight and simultaneously is technically sacrosanct.
The present invention meets the abovementioned long felt needs.
OBJECTS OF THE INVENTION
It is the principal object of the present invention to provide an improved modular
trommel assembly, which is scalable, easy to transport and easy to assemble, is of
substantially low weight and is simultaneously technically sacrosanct.
It is another object of the present invention to provide an improved modular
trommel assembly which ensures that the stresses and displacements in structural
elements are within limits.
How the foregoing objects are achieved and the other aspects of the present
invention will be clear from the following description, which is purely by way of
understanding and not by way of any sort of limitation.
SUMMARY OF THE INVENTION
Accordingly, the present invention provides an improved trommel assembly for
screening different particles, comprising a plurality of modular units detachably
attached to one another, each modular unit having a flange adapted to firmly attach
with one or more corresponding flanges of one or more corresponding modular units.
In accordance with preferred embodiments of the trommel assembly of the present
invention:
-said flange of one modular unit is attached to a corresponding flange of another said
modular unit by plates or channel sections using suitable fixing media such as herein
described, said plates or channel sections being located at the ends of each said
modular unit and said flanges having holes arranged in an array, for facilitating
joining to a corresponding flange of another module;
-there exists a plurality of beam members and cross members between every two
said flanges, said beam members acting as the main load carrying members and
said cross members being adapted to take up and distribute the stresses and
comprise different types of sections;
-plates are applied to fix said cross members to said flanges and to said beam
members, two ends of each said cross member and each said beam member being
attached to a flange body at either end;
-said plates are chamfered plates of certain sizes which are welded to the beam
member and flange surfaces using standard welding procedures so that the overall
rigidity of the structure remains intact;
-an assembly of ribs and angles are welded together to fix said beam member to
said flanges;
-every two said ribs are welded to a said angle, said beam members being welded
together on to said angle, said beam members being fixed to said flanges by
welding;
-there exists a modular transition piece for joining of said trommel structure to the
mill discharge face applying suitable fixing media such as bolted connections, said
transition piece having a front flange and also ribs for allowing transfer of load from
said trommel structure to the mill discharge face, through said bolted connections;
-modular trommel screen panels made of polyurethane or rubber are also fixed on
the inner side of said assembly to complete the structure and make it operational.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The nature and scope of the present invention will be better understood from the
accompanying drawings, which are by way of illustration of a preferred embodiment
and not by way of any sort of limitation. In the accompanying drawings,
Figures 1a, 1b and 1c illustrate the isometric, front view and side view respectively
of a preferred embodiment of the modular trommel assembly in accordance with the
present invention.
Figures 2a, 2b and 2c illustrate the isometric, front view and top view respectively of
the 180 degree section module unit of the modular trommel assembly.
Figures 3a and 3b are the isometric and front view respectively of the angle section
of the trommel assembly.
Figures 4a and 4b illustrate the isometric and front view respectively of the rib of the
trommel assembly.
Figures 5a and 5b illustrate the isometric and front view respectively of the Load
carrying member or beam section of the trommel assembly.
Figures 5c is the isometric view of the channel section of the trammel assembly.
Figure 5d is the isometric view of the Flange of the trommel assembly.
Figure 6 is the isometric view of the cross member of the trommel assembly.
Figures 7a and 7b illustrate the isometric and top view respectively of the chamfer
plates of the trommel assembly.
Figures 8a and 8b illustrate the isometric and front view respectively of the
segmented transition pieces of the trommel assembly.
DETAILED DESCRIPTION OF THE INVENTION
The following describes a preferred embodiment of the present invention, which is
purely for the sake of understanding the present invention and not by way of any
sort of limitation.
The trommel assembly in accordance with the present invention comprises of
modular units for achieving its desired objectives, as narrated under the heading
"Objects of the Invention"
In all the figures like reference numerals represent like features. The figures are now
being referred to one after another for the purpose of explaining the invention.
According to the invention, the whole trommel assembly as shown in Figures la, lb
& lc is being made by assembling several numbers of the modular section unit(2)
best shown in figure 2a. The unit (2) can be of different sizes and comprises of
different dimensions of elements. Several such units (2) with its elements are all
suitably fixed to form the modular trommel assembly according to the present
invention. Each modular element (2) comprises plurality of elements in different
configurations and size for the structural rigidity of the whole trommel assembly (1).
Figure la illustrates a perspective view of such a modular trommel assembly, while
figures lb illustrate front view and side view respectively of such assembly.
Now, how the modular units (2) and its various parts are connected is now explained
with reference to the subsequent figures.
First of all figure 2a is being referred to, which illustrates a 180° section of a basic
modular unit (2) of the present invention, each unit comprising of a flange (3). To be
precise, figure 2a shows at least two such flanges (3) joined together. A plurality of
each unit (2), are actually assembled to form the trommel structure.
Figure 2b is a front view of the unit shown in figure 2a, while figure 2c is a top view
of the same.
Each modular unit (2) consists of a flange (3) which can be of different thickness
depending on the size and length of the whole trommel structure. The flange (3) has
holes (9) arranged in an array in them so that they can be joined to a corresponding
flange (3) of another module (2) using suitable fixing-media, to form the trommel
assembly. The fixing media may be different kinds of bolts, rivets and locking
systems for fixing two or more parts together. All the fixing media are tested for
strength and fatigue limits for safe functioning of the parts and the whole structure.
Figure 5d shows the flange (3) of each modular unit (2) in greater detail. Flanges,
which can be made of any structural material is an important and integral part of
each modular unit (2).
As shown in figure 2a there exist beam sections (4) between every two flanges (3)
as the main load carrying members and the cross members (5) between two such
flanges (3) take up the stresses and distribute them and can comprise of different
types of sections. Figure 5a shows a perspective view of a beam section (4) in
greater detail, while figure 5b shows a front view thereof. Figure 6 shows a
perspective view of a cross member (5).
The Load carrying members (4) can be any kind of beam elements of the variable
dimensions depending upon the application. Similarly, the cross members(5) which
help out in distribution of the stresses and keeping the structure intact, can be of
different dimensions depending on the structure of the trommel.
Coming back to figure 2a again, it can be seen that plates (8) are applied to fix the
cross members (5) to the flanges (3) and to the beams or load carrying members
(4). The two ends of each cross member (5) and each beam (4) are attached to a
flange (3) body at either end. The plates (8) can be chamfered plates of certain sizes
which are welded to the beam (4) and flange (3) surfaces using standard welding
procedures so that the overall rigidity of the structure remains intact. Figure 7a
illustrates a perspective view of such a chamfered plate (8), while figure 7b
illustrates a top view thereof.
As shown in figure 2a, two flanges (3) of two modular sections (2) are joined by
plates or channel sections (7). These are located at the ends of each unit (2). These
plates (7), thus facilitate joining of two different modules (2) using suitable fixing
media as described hereinbefore. Figure 5c is an isometric view of such channel
section or plate (7), which comprises drilled holes (15) for allowing fixing of two or
more modular sections (2).
The portion represented by reference numeral 6 in figure 2a is an assembly of ribs
and angle welded together, to fix the load carrying beams (4) to the flanges(3). As
shown in detail in figures 4a and 4b, this unit (6) consists of two ribs (11). These ribs
(11) are welded to the angle (10) shown in Figures 3a & 3b. It is this angle (10), on
to which the beam sections (4) are welded together, following standard procedures
which again is fixed to the flanges(3) using welding.
Now coming back to figure la and also figures 8a and 8b, it can be seen that the
transition piece (3') is also modular and after being fixed together using suitable
fixing media it helps in joining of the trommel structure to the mill discharge face
using bolts. The front flange (3"), which is best shown in figures la and 8a is a part
of the transition piece (3') of the trommel assembly according to the present
invention. The ribs (11') of the transition piece (3') or part can be of any structural
material and allows the transfer of load from the trommel structure (1) to the mill
discharge face, through the bolted connections.
The modular trommel assembly thus functions on being fixed to the mill ends as
usual rotates with the mill and functions effectively to do screening of different
particle size ranges depending upon the size of the aperture on the trommel screen
panels. The assembly is light weight and achieves the desired objectives of the
present invention.
The objects of the present invention are thus achieved by fixing together different
identical modular units to make up a trommel assembly, which is then fixed to the
mill end.
The different elements or parts of the module is constructed using different materials
of construction like stainless steel, mild steels etc.
Modular trommel screen panels made of polyurethane or rubber are also fixed on the
inner side of the trommel to complete the structure and make it operational. The
fixing of the panels can be of different arrangement like button type fixing or bolt-
down fixing etc.
Number of modules can be put together inside a transport container/truck/van etc
and then shipped to desired site location where it can be held using cranes or other
support mechanism then put together using the fixing-media. Then the whole
structure can then be fixed onto the mill discharge using bolts.
If any of the modules get damaged, then, according to the present invention, instead
of changing the whole trommel only the damaged module needs to be changed
resulting in saving the customers' time and money.
From the description hereinbefore and from the claims it would be clear that all
objectives of the invention are achieved.
The present invention has been described with reference to some drawings and a
preferred embodiment, purely for the sake of understanding and not by way of any
limitation and the present invention includes all legitimate developments within the
slope of what has been described herein before and claimed in the appended claims.
WE CLAIM:
1.An improved trommel assembly for screening different particles, comprising a
plurality of modular units(2) detachably attached to one another, each modular unit
having a flange(3) adapted to firmly attach with one or more corresponding
flanges(3) of one or more corresponding modular units(2).
2. The improved trommel assembly as claimed in claim 2 wherein said flange(3) of
one modular unit(2) is attached to a corresponding flange(3) of another said modular
unit(2) by plates or channel sections(7) using suitable fixing media such as herein
described, said plates or channel sections(7) being located at the ends of each said
modular unit(2) and said flanges(3) having holes(9) arranged in an array, for
facilitating joining to a corresponding flange(3) of another module(2).
3. The improved trommel assembly as claimed in claim 2 wherein there exists a
plurality of beam members(4) and cross members(5) between every two said
fianges(3), said beam members(4) acting as the main load carrying members and
said cross members(5) being adapted to take up and distribute the stresses and
comprise different types of sections.
4.The improved trommel assembly as claimed in claim 3 wherein plates(8) are
applied to fix said cross members(5) to said flanges(3) and to said beam
members(4), two ends of each said cross member(5) and each said beam
member(4) being attached to a flange(3) body at either end.
5.The improved trommel assembly as claimed in claim 4 wherein said plates(8) are
chamfered plates of certain sizes which are welded to the beam member(4) and
flange(3)surfaces using standard welding procedures so that the overall rigidity of
the structure remains intact.
6. The improved trommel assembly as claimed in claims 4 and 5 wherein an
assembly of ribs(ll) and angles(lO) are welded together to fix said beam
member(4) to said flanges(3).
7. The improved trommel assembly as claimed in claim 6 wherein every two said
ribs(ll)are welded to a said angle(10), said beam members (4) being welded
together on to said angle(10), said beam members being fixed to said flanges(3) by
welding.
8. The improved trommel assembly as claimed in any preceding claim wherein there
exists a modular transition piece(3') for joining of said trommel structure to the mill
discharge face applying suitable fixing media such as bolted connections, said
transition piece(3') having a front flange(3") and also ribs(11') for allowing transfer
of load from said trommel structure(l) to the mill discharge face, through said
bolted connections.
9.The improved trommel assembly as claimed in any preceding claim wherein
modular trommel screen panels made of polyurethane or rubber are also fixed on the
inner side of said assembly(1) to complete the structure and make it operational.
10. An improved trommel assembly substantially as herein described, particularly
with reference to the accompanying drawings.

ABSTRACT

An improved trommel assembly(1) for screening different particles, comprising a
plurality of modular units(2) detachably attached to one another, each modular unit
having a flange(3) adapted to firmly attach with one or more corresponding
flanges(3) of one or more corresponding modular units(2).