Note: Descriptions are shown in the official language in which they were submitted.
~15~.~3~';'
MI~ERAL BREAKERS
Tne present invention relates to miner31 break~r~
in particularlv, to miner~l breakers for use in coal mi~in;
for ensuring maximum sizing of coal,
According to the present invention there is provided
a mineral breaker having a pair of side by side brea'~er
drums which are spaced laterally from one another and
arranged to rotate in opposite directions, each drum having
a plurality of breaker teeth arranged in circumferentially
extending groups of teeth spaced along each drum with the
i groups of teeth on one drum being positioned so as to
extend between the groups of teeth on the other drum.
Reference is now made to the accompanying drawings, I
in which: !
Figure 1 is a plan view, partly in section, of a
mineral breaker according to the present invention;
Figure 2 is a side view of th'e mineral breaker shown
in Figure l;
Figure 3 is a sectional view taken along line III~
20 in Figure 2;
Figure 4 is a similar view to that of Figure 3 of a
different embodiment according to the present invention;
Referring initially to Figures 1 to 3, a mineral
breaker 10 includes a main frame 11, which in use is
25 capable of being sited over a conveyor for depositing t
sized material onto the conveyor which then transports the
sized mineral away. The frame 11 houses a pair of breaker
drums 14 which are located within a chamber lla defined
by side walls llb of the housing and end support walls
50,51. Each of the drums 14 is fixedly mounted on shafts
15 and 16 respectively. Each drum is provided with a
plurality of breaker teeth 17 which are arranged in cir-
cumferentially extending groups of teeth, with the groups
on one drum being positioned so as to extend between the
groups on the other drum.
.
.'~ '
. ~
" :
'
l:lS, :~3~ ~
Both shafts 15,16 are ro-tatably supported at each
end in bearing assemblies 19,20 respectively. Each pair
of bearing assemblies 19,20 are respec-tively moun-ted wi-thin
bearing seats 52,53 formed in end suppor-t walls 50,51
respectively. The end support walls 50,51 are each composed
of two separate halves 50a, 50_ and 51_,51_ respectively,
` each half being secured to the side walls of the housing by
bolts 54. Thus by separating adjoined halves it is possible to
remove the respective bearing assemblies from the end support
walls.
Shaft 15 is drivingly connected via a drive coupling
28 to an electric motor and reduction gear box assembly 30
which is bolted to an end plate 58 of the housing 11. Prefer-
ably the drive coupling 28 is of similar cons-truction to that
disclosed in U.K. Patent application 40511/78 published on
May 21, 1980 under Publication No. 2033538.
Shafts 15 and 16 are drivingly connected to one another
by means of a pair of meshing gears 35 so that the drums 14
,
rotate in opposite directions. -As shown in ~igure 3 the angular
position of the teeth on one drum in relation to those on the
;- other drum is preferably arranged so that teeth on one drum
extend between the circumferential spacing between teeth on the
other drum. This relative angular posi-tion is maintained during
operation by the meshing gears 35. It will be appreciated
that the relative angular position between teeth on the drums
may be adjusted as desired by changing the relative angular
position of meshing gears 35. By changing the relative angular
positions of the teeth on the drums 14 it is possible to adjust
the breaker so as to produce sized material of a predetermined
` 30 size.
- 2 -
'' ~
'
;
3~'7
The breaker teeth 17 are of a robus-t construc-tion,
as seen in Figures 3 and 4, and are cons-tructed so a~ to be~
capable of breaking minera] which -the breaker is in-l:ended -I:o
, size. According, due to the interrelationship of -the
: breaker teeth 17 all oversized mineral passin~ be-tween -the
2a -
, ,~,'"
. .
- ,
1~53347
breaker drums 14 is brqken to ~rovide sized mineral w~i_h
is of a predetermined maximum size.
The shape of the breaker teeth 17 facilitates breaking
of the oversized mineral in that a recess 59 ls provi~ed
between adjacent rear faces 60 of teeth 17, the rear
face of each tooth 17 being defined by a ridqe 61 which in
cross-section is arcuate as shown in Figures ~ and 4.
The width of rid~e 61 is chosen bearing in mind the working
conditions of the breaker. Accordingly oversized material ~
10 will initially be seated across the ridges 61 of one or '?"
more adjacent teeth 17 on one drum and then on rotation
of the drums, the front face 62 of teeth 17 on the other
drum will engage the oversized material seated on the ridges
61. The oversized mineral will therefore be subjected to
opposed loadings along its length thus causing it to fracture.
As seen in Figures 3 and 4, the front face 62 of
, .
each tooth 17 is inclined so as to define with an acute
enclosed angled~ with the tangent to the circumference
~ of the drum at the point of intersection of the face 62
; 20 with the periphery of the drum. It will be appreciated
that angle oL may be varied as desired to suit working
- conditions of the mineral breaker.
In the embodiment of Figures 1 to 3, the teeth 17
on each drum 14 are formed separately to the drum 14.
Thus sets of teeth 17 are cast together to form an elong-
ate toothed strip 17a which includes a body portion 17b
and teeth 17 projecting therefrom. The body portion 17b
is provided with a rib 17c which extends longitudinally
along same side of the body portion 17b as that from which
the front faces 62 of teeth 17 are located.
, Each drum 14 is provided with longitudinally
extending channels 70 spaced circumferentially from one
another. Each channel 70 has a bottom wall 70a against
which the bottom face 17d of the body portion 17b abuts
in use. Each channel also has a groove 71 for housing
rib 17c as seen in Figure 3. Each drum 14 is provided
' ~ ,. 1
.
,:
.,:
.. . .
~ ~ .
1:~5334'~
with bolt stud~ 75 which are anchore~ i~ the dr~ and
project outwards into channel 7a. The strips 17a are
provided with apertures 80 and nut accomodating recess~s
81 for securing each strip to the drum. For the sake o~
simplici~ty, apertures 80 and recesses 81 have ~een
omitted from Figure 2, t~eir locati~on being ~dentified
by crosses A. As seen ~n Figure 2 ! two str~ps 17a are
provided ~n eac~ channel 70. It ~ e appreciated that
toothed drums of vary~ng lengths may easily be constructed
using one or more strips 17a per channel 70.
The method of securing the strip 17a to the drums 14
described above is particularly advantageous since removal l;
of the strips is relatively simple ~y removal of nuts 76
whilst, in use, loadingsapplied to the front faces S2 of p
t~e teeth are transmitted to the drum via ribs 17c and
co-operating grooves 71 and the bottom face 17d of the
body portion 17b and the bottom wald 70a of channel 70.
Thus in use, bolt studs 75 and nuts 76 are not loaded by
the breaking operation of the drums.
It is to be noted that in Figure 3 all teeth 17
are formed on strips 17_ and that for the sake of
simplicity only one strip 17a is shown.
In the embodiment of Figure 4, all parts of the
breaker are the same as those described in respect of the
embodiment of Figures 1 to 3 apart from the drum construc-
tion. Thus, in Figure 4, teeth 17 are formed integrally
; with drums 14 instead of being formed on strips 17a.
.,, 'I
.",,
<
, .
;'
.,
.
; ,
''~ ' .
