Abstrict An impact roll crusher for grinding up material, for example in
mineral mining, employs a roll equipped with impact heads which
co-operates with part of a conveyor transporting the material. The
roll is rotatably mounted in a housing and a hood is connected to
the housing to deflect and discharge the crushed material. The crusher
roll is driven by a belt coupled to pulleys on the roll and on a
drive motor shaft. The drive motor is supported by a bracket pivotably
mounted on an inclined baffle wall of the hood. The roll drive adopts
a position below the upper surface of the crusher housing. A tensioning
device operable to adjust the tension in the drive belt is coupled
to the bracket and adjusts the pivotable movement of the bracket.
Claims We claim:
1. An impact roll crusher assembly comprising:
an impact roll crusher composed of a housing, an impact roll and
means for supporting the impact roll for rotation in the housing;
a conveyor wherein at least part of the conveyor for transporting
material to be treated co-operates with the impact roll, the impact
roll being supported for rotation about an axis which extends transversely
of the direction in which the material is transported by the conveyor;
a crusher drive composed of a motor and an elongate drive member
for drivably coupling the impact roll to the motor for rotatably
driving the roll, the crusher drive motor and the drive member being
located externally of the crusher housing; and
a discharge hood fitted to the crusher housing and having a discharge
opening for discharging material after crushing, wherein the discharge
hood has an inclined wall having an inner surface, the inclined
wall serves to deflect and guide material from the crusher housing
to the discharge opening, the crusher drive motor is mounted on
a support bracket which is pivotably mounted on the inclined wall
of the hood below an uppermost surface of the crusher housing, and
means is provided for adjusting the tension in the drive member
by pivotal movement of the support bracket.
2. An assembly according to claim 1 wherein the drive member is
an endless belt.
3. An assembly according to claim 1 wherein the crusher drive
motor is mounted on a support bracket which is adjustably carried
on the inclined wall of the hood to permit variation of tension
in the drive member.
4. An assembly according to claim 1 wherein the bracket is pivotably
mounted to the inclined wall with a pivot joint having an axis generally
parallel to the crusher roll axis and the pivot joint is disposed
below the crusher drive motor.
5. An assembly according to claim 4 wherein the pivot joint between
the bracket and the inclined wall is formed by connection pieces
on the bracket and the inclined wall, the connector pieces being
provided with eyes and a pivot pin fitting through the eyes of the
connection pieces.
6. An assembly according to claim 4 wherein the adjustment means
is a tensioning device for displacing the bracket to vary the tension
in the drive member, said tensioning device being mounted between
a side connection of the hood and the bracket, the drive member
is entrained around pulleys respectively connected to an output
shaft of the crusher motor and to the crusher roll, a protective
cover extends around the pulleys and the drive member and the tensioning
device has an upper end region extending between the cover and the
drive member and the side of the hood and is connected with a pivot
joint to the bracket and wherein the pivot joint between the inclined
wall and the bracket is disposed below the protective cover.
7. An assembly according to claim 6 wherein the protective cover
is releasably connected to the bracket.
8. An assembly according to claim 1 wherein the adjustment means
is a tensioning device for displacing the bracket to vary the tension
in the drive member, said tensioning device being mounted between
a side connection of the hood and the bracket.
9. An assembly according to claim 8 wherein the drive member is
entrained around pulleys respectively connected to an output shaft
of the crusher motor and to the crusher roll, a protective cover
extends around the pulleys and the drive member and the tensioning
device has an upper end region extending between the cover and the
drive member and the side of the hood and is connected with a pivot
joint to the bracket.
10. An assembly according to claim 1 wherein the inclined wall
has on its inner surface a number of wear resistant plates.
11. An assembly according to claim 1 wherein the conveyor is a
scraper-chain conveyor and said part of the conveyor has I-shaped
side walls with a floor plate therebetween for guiding the scrapers,
the side walls having upper flanges which confront the impact roll
and form an abutment co-operating with the impact roll.
12. An assembly according to claim 11 wherein the impact roll
is composed of a plurality of discs stacked side-by-side on a rotatable
spindle and impact heads fitted to the discs.
13. An assembly according to claim 1 wherein the drive member
extends in a generally horizontal disposition or at a slight angle
to the horizontal.
14. An impact roll crusher assembly comprising:
an impact roll crusher composed of a housing, an impact roll and
means for supporting the impact roll for rotation in the housing;
a conveyor wherein at least part of the conveyor for transporting
material to be treated co-operates with the impact roll, the impact
roll being supported for rotation about an axis which extends transversely
of the direction in which the material is transported by the conveyor;
a crusher drive composed of a motor and an elongate drive member
for drivably coupling the impact roll to the motor for rotatably
driving the roll, the crusher drive motor and the drive member being
located externally of the crusher housing; and
a discharge hood fitted to the crusher housing and having a discharge
opening for discharging material after crushing, the discharge hood
has an inclined wall having an inner surface which serves to deflect
and guide material from the crusher housing to the discharge opening
and the crusher drive motor is mounted on the inclined wall of the
hood below an uppermost surface of the crusher housing, wherein
the impact roll is composed of a plurality of discs stacked side-by-side
on a rotatable spindle and impact heads are fitted to the discs,
the discs having recesses for receiving the impact heads and locking
bolts serve to retain the heads within the recesses, each of the
recesses having a radial support face engaging with a rear face
of a support portion of the associated impact head and the associated
locking bolt extends through a bore in the disc perpendicular to
the rear face and passes through an open slot in the support portion
of the head, the support portion of each impact head has a projection
which fits into a depression in a wall of the recess opposite the
radial support face, each impact head has a front face opposite
the rear face which is inclined relative to the rear face and merges
over a curved region with a shoulder of the projection extending
parallel to the longitudinal axis of the locking bolt and wherein
the associated locking bolt has a clamping member shaped to engage
and clamp against part of the front face and on the shoulder and
curved region.
15. An assembly according to claim 14 wherein part of the front
face of each impact head projects outwardly from the associated
disc for impact with the material being crushed.
16. An assembly according to claim 14 wherein the locking bolt
clamping member is of polygonal shape.
17. An assembly according to claim 14 wherein the angle of inclination
of the front face of each impact head is about 15.degree..
Description FIELD OF THE INVENTION
The present invention relates to an impact roll crusher and, more
particularly, to an assembly employing such a crusher.
BACKGROUND TO THE INVENTION
Impact roller crushers are designed to reduce coarse material in
mineral mining or quarrying to a smaller size. Usually such crushers
have a rotating roll in a housing which co-operates with an end
region of a conveyor to treat the material. The material is continuously
passed between the roll and an abutment forming part of the conveyor
and the material is broken down into smaller size grains or particles
or lumps and discharged.
In one known design, the crusher roll drive takes up considerable
space and especially in the vertical sense and this is a great disadvantage
in cramped underground mine workings. Moreover, the crusher drive
is not readily accessible or easily adjusted.
A general object of the present invention is to provide an impact
roll crusher assembly of improved design.
SUMMARY OF THE INVENTION
According to the present invention there is provided an impact
roll crusher assembly comprising an impact roll crusher composed
of a housing and
an impact roll supported for rotation in the housing;
at least part of a conveyor for transporting material to be treated
which co-operates with the impact roll, the impact roll being rotatable
about an axis which extends transversely of the direction in which
the material is transported by the conveyor;
a crusher drive composed of a motor, an elongate drive member for
drivably coupling the roll to the motor for rotatably driving the
roll, the crusher drive motor and drive member being located externally
of the crusher housing and
a discharge hood fitted to the crusher housing and having a discharge
opening for discharging material after crushing, wherein the discharge
hood has an inclined wall which serves to deflect and guide material
from the crusher housing to the discharge opening and the crusher
drive motor is mounted on the inclined wall of the hood below an
uppermost surface of the crusher housing.
The conveyor part and the crusher and its mounted drive can be
carried by a common frame resting on the floor of the working and
this frame can conveniently also support drive means for driving
the conveyor. The arrangement according to the invention ensures
the overall height of the assembly is defined solely by the height
of the crusher housing and this permits use of the assembly even
in cramped mine workings.
Preferably, the crusher drive motor is mounted on a support bracket
which is adjustable or displaceable relative to the inclined wall
of the discharge hood to control the tension in the drive member
which can be an endless belt. The bracket can be pivotably mounted
to the inclined wall with a pivot joint having an axis generally
parallel to the crusher roll axis and the pivot joint is disposed
below the crusher drive motor. To control the tension in the drive
member a tensioning device, such as a screw threaded spindle, can
be coupled between a side of the hood and the motor support bracket.
The drive member can be entrained around pulleys respectively connected
to an output shaft of the crusher motor and to the crusher roll.
The drive member or belt can adopt a position at a slight angle
to the horizontal and this is particularly advantageous.
A protective cover can extend around the pulleys and the drive
member. The tensioning device then has an upper end region extending
between the cover and the drive member and the side of the hood
and connected with a pivot joint to the bracket.
The provision of the tensioning device easily accessible for adjustment
of the tension in the drive member and the general arrangement of
the crusher drive in accordance with the invention is particularly
advantageous. The crusher roll housing is not directly exposed to
the weight of the crusher drive motor and instead the inclined hood
wall is used to support the motor. This wall, which acts as a deflecting
baffle for the material discharged from the crusher housing, must
be strong in any event to perform its main function. The inclined
wall is preferably reinforced in any event with wear resistant plates
on its inner surface. The weight of the crusher drive motor is converted
into compressive force acting through the discharge hood on the
end of the crusher housing.
The conveyor may be a scraper-chain conveyor and in this case the
part associated with the crusher may have I-shaped side walls with
a floor plate therebetween for guiding the scrapers, the side walls
having upper flanges which confront the impact roll and act as an
abutment for the crushing of material.
The impact roll itself can be composed of a series or stack of
discs carrying impact tools or heads arranged side-by-side on a
spindle rotatably supported by bearings in or on the crusher housing.
The spindle can be adjustable in position to vary the crushing action
and the size of the particles, grains or lumps discharged. The discs
can have recesses for receiving the impact heads and locking bolts
serve to secure the impact heads within the recesses. Each of the
recesses can have a radial support face engaging with a rear face
of a support portion of the associated impact head and the mounted
locking bolt then extends through a bore in the disc perpendicular
to the rear face and passes through an open slot in the support
portion of the head. This permits the locking bolt to be loosened
and the head withdrawn without removal of the bolt. Preferably,
the support portion of the head engages in a hook-like fitting action
with a projection in a depression in a wall of the recess opposite
the radial support face. The impact head can have a front face opposite
the rear face which is inclined relative to the rear face and merges
over a curved region with a shoulder of the projection extending
parallel to the longitudinal axis of the locking bolt, The associated
locking bolt can then have a clamping member shaped to engage and
clamp against part of the front face and on the shoulder and curved
region.
The invention may be understood more readily, and various other
aspects and features of the invention may become apparent, from
consideration of the following description.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention will now be described, by way of
example only, with reference to the accompanying drawings, wherein:
FIG. 1 is a side view of an assembly constructed in accordance
with the invention and composed of a discharge end region of a conveyor,
an impact roll crusher and drives for the conveyor and crusher;
FIG. 2 is a plan view of the assembly shown in FIG. 1;
FIG. 3 is a simplified schematic side view representation of part
of the assembly taken on a somewhat larger scale to FIG. 1;
FIG. 4 is a part-sectional plan view of some components of the
part assembly represented in FIG. 3;
FIG. 5 is a part-sectional side view of a motor support bracket
used in the assembly depicted in FIGS. 1 to 4;
FIG. 6 is a plan view of the bracket shown in FIG. 5;
FIG. 7 is a view of a discharge hood taken in the direction of
arrow VII in FIG. 3 with the crusher drive and motor support bracket
removed;
FIG. 8 is a vertical section through the impact roll crusher of
the assembly;
FIG. 9 is a partial cross-section taken normally to the axis of
rotation of the impact roll and showing one of the impact heads;
FIG. 10 is a side view of the impact head depicted in FIG. 9; and
FIG. 11 is a plan view of the impact head shown in FIGS. 9 and
10.
DESCRIPTION OF PREFERRED EMBODIMENTS
In general, and as depicted in FIG. 1 an impact roll crusher 65
serves to operate continuously to crush material transferred along
a conveyor 1. Material can be delivered onto the conveyor 1 at any
region along its length and the material is transported by the conveyor
1 in the direction of arrow 2 to the crusher. The crusher employs
a driven impact roll 3 (FIG. 8) which rotates about a horizontal
axis extending transversely to the conveying direction 2 above an
end region of the conveyor 1 in a housing 4. The roll 3 crushes
the material between the roll 3 and part of the conveyor 1 acting
as an abutment. The housing 4 defines a discharge opening 5 from
whence the now crushed loose material is deflected and discharged
downwardly in the direction of arrow 6. The impact roll crusher
is united in an assembly which also employs a conveyor drive means
composed of motors 7 on opposite sides of the conveyor. The conveyor
1 with its drive means 7 and the crusher with its drive are supported
by a common frame with a base 8 resting on the floor of a mine or
drift working. The opening 5 of the crusher housing 4 is covered
by a discharge hood 9 detachably fitted to the housing 4. Conveniently,
the hood 9 is fitted to the housing 4 with screws engaged in bores
in inter-engaging flanges as indicated by reference numerals 10
in FIG. 1. The hood 9 has an inclined wall 11 extending over the
discharge zone of the hood 9 to act as a deflecting baffle for material
thrown out from the impact roll 3. A further deflecting member or
chute 12 can be located beneath the hood 9 to receive the material
deflected from the wall 11 and guides the material for the downward
discharge 6. The wall 11 of the hood 9 is inclined at an angle of
about 40.degree. to 50.degree. to the horizontal and the inner face
of this wall 11 is preferably equipped with a number of replaceable
wear resistant plates.
The crusher drive takes the form of a motor 13 mounted on the outer
face of the wall 11 in a location below the upper surface 4' of
the crusher housing 4. The crusher drive motor 13 is supported by
a tiltable bracket 14 below the drive motor 13. The bracket 14 is
pivotably carried on the wall 11 by means of a pivot joint 15 with
a horizontal axis transverse to the conveying direction 2.
As shown in FIGS. 5 and 6 the bracket 14 has two fork-like connecting
pieces 16 with eyes 17 for receiving a pivot pin 18 (FIG. 8) of
the pivot joint 15. As shown in FIG. 7 the wall 11 of the hood
9 is likewise formed with connection pieces 19 with eyes 20 for
receiving the pin 18. FIG. 6 shows that the bracket 14 also has
keyhole-shaped slots 21 for receiving bolts for mounting the drive
motor 13 and for permitting adjustment of the motor 13 relative
to the bracket 14. The motor 13 drives the roll 3 of the crusher
by way of a belt 29. As shown in FIGS. 1 to 5 the bracket 14 has
a depending plate portion 22 with a lug in which there is an aperture
23 for facilitating the connection of a belt tensioning device 24.
The plate portion 22 engages over a side face of the hood 9 as shown
in dotted outline in FIG. 1. The tensioning device 24 can be connected
to the bracket 14 with a pivot pin engaged in the aperture 23 and
the device 24 can be operated to displace the bracket 14 about the
pivot joint 15 in order to adjust the tension in the drive belt
29. The device 24 can be left connected to the bracket 14 and supported
against a side wall 25 of the hood 9 with a connection 26. The drive
belt 29 for rotating the impact roll 3 is entrained around a first
smaller pulley 27 supported on the shaft of the drive motor 13 and
a second larger pulley 28 supported on a spindle or shaft of the
impact roll 3. The pulley 28 is disposed on the outside of the crusher
housing 4. The drive belt 29 which can be a V-belt, drivably couples
the roll 3 to the motor 13. The belt 29 and its pulleys 27 28 are
all disposed within a protected cover 30 which extends over the
side walls of the housing 4 and the hood 9 as well as the bracket
14. As shown in FIG. 6 the bracket 14 has a flanged member 31 on
which the cover 30 is detachably mounted. Conveniently the cover
30 is fixed with screws or bolts for easy release.
It can be seen from the drawings that not only the drive motor
13 but also the belt drive system 27 28 29 and the cover 30 all
lie below the upper surface 4' of the crusher housing 4. The belt
29 extends in a vertical plane (FIG. 1) but at a small angle to
the horizontal in relation to the housing 4 and the hood 9. FIGS.
1 to 4 also show that the tensioning device 24 is located below
the belt 29 and extends with its upper portion behind the cover
30 i.e. between the cover and the side face 25 of the hood 9 to
locate with the bracket 14. The device 24 can thus be operated to
tension the belt 29 without dismantling the cover 30. The drive
motors 7 for the conveyor 1 lie below the belt 29 and the housing
4.
As shown particularly in FIG. 8 the impact roll 3 which rotates
in the housing 4 is composed of a plurality of stacked discs 34
fixed on a support spindle 33. All the discs 34 have the same diameter
and the discs 34 are equipped with impact tools or heads 41 described
hereinafter. The spindle 33 extends horizontally transverse to the
conveying direction 2 and is supported for rotation in bearings
35 mounted at the sides of the housing 4. The drive pulley 28 is
fixed on the outer end of the spindle 33 adjacent the belt 29 and
outside the housing 4. The roll 3 is preferably adjustable in a
vertical sense in the housing 4 in order to vary the size of the
crushed material. This can be accomplished by mounting the bearings
35 on displaceable supports guided on the housing 4 and by providing
hydraulic rams depicted in FIG. 8 to displace the bearing supports.
The conveyor 1 is preferably a scraper-chain conveyor with scrapers
36 spaced apart along one or more chains. The scrapers 36 are guided
in guide channels 37 formed by the side walls 38 of individual channel
sections or pans. At least in the region of the assembly and the
crusher with its common frame the side walls 38 of the end most
channel section have stout I-shaped profiles with a floor plate
therebetween. The side walls 38 have their upper flanges 39 located
immediately beneath the impact roll 3. This region of the conveyor
1 beneath the roll 3 acts as an abutment for the material crushed
by the roll 3. The outermost disc 34 on the spindle 33 are bevelled
as at 34' to prevent material accumulating and jamming between the
roll 3 and the upper flanges 39.
FIGS. 9 to 11 depict one design for the impact heads 41 and their
attachment to the discs 34. Each impact head 41 has a impact portion
43 projecting beyond the periphery of its associated disc 34 and
a support portion 44. Each disc 34 has a recess 40 which receives
the portion 44 of the associated impact head 41 which is secured
in place with a locking bolt 42. The portion 44 engages in the recess
40 in shaped-locked fashion and is provided with a slot 45 open
toward the free inner end of the head 41 and into which the bolt
42 is received. When assembled to the disc 34 the head 41 is supported
with its rear flat face 46 on a support face 47 of the recess 40
extending radially of the disc 34. The recess 40 is shaped with
an inner depression or groove 48 which receives a corresponding
projection 62 of the portion 44 as shown in FIG. 9 to provide a
hook-like shape-locking. The inner face 49 of the recess 40 which
forms a continuation of the rear wall of the depression 48 extends
perpendicularly to the support face 47 and perpendicularly to a
bottom wall 50 of the depression 48. The free front face 51 of the
head 41 opposite the rear face 46 extends at an angle X, preferably
about 15.degree., to the rear face 46 and extends with a region
52 as a working face over the exposed impact portion 43. The projection
of the support portion 44 which engages in the depression 48 merges
smoothly with the front face 51 at a curved transition zone 53 and
a shoulder 54 parallel to the inner face 49 and the axis of the
locking bolt 42. The shoulder 54 forms a continuation of a surface
54' of the recess 40. The locking bolt 42 has an end piece 55 of
square cross-section. An intermediate clamping member 56 fits snugly
between the end piece 55 and the faces 51 54 54' as shown in FIG.
9. The member 56 can have a bore which receives the shank of the
bolt 42 and the member 56 can be welded to the end piece 55. It
is of course possible to unite the end-piece 55 with the intermediate
member 56. The member 56 has a frusto-conical profile with a surface
57 designed to bear on the face 51 and a projection 60 designed
to engage in the zone 53 and to bear on the faces 54 54'. In this
way, the impact head 41 is positively locked into the recess 40
as the bolt 42 is tightened and tensioned. During assembly of the
impact head 41 to the disc 34 the bolt 42 is introduced into a
bore 58 in the disc 34 and a nut 59 is screwed onto the free threaded
end region of the bolt 42. With the nut 59 loosely coupled to the
bolt 42 the impact head 41 is inserted into the recess 40 so the
support portion 44 fits into the recess 40 and the depression 48
and the slot 45 engages around the shank of the bolt 42 and abuts
the latter with a rounded face 45' (FIG. 11). The nut 59 is now
tightened to force the clamping member 56 into locking engagement
with the head 41. A lock nut 61 is used to secure the nut 59 when
the head 41 has been set. When the impact head 41 is to be replaced
the nut 59 need only be released to the extent necessary to enable
the member 56 to be disengaged. The head 41 can then be withdrawn. |