Abstrict A roll crusher having a box-like main frame, a material inlet and
material outlet, a first rotatable crushing roll on the frame and
a second rotatable crushing roll mounted on a roll carriage in an
opposed, spaced apart relationship to the first crushing roll defining
a material crushing gap. The roll carriage is a generally rectangular
frame positioned atop the main frame having one end attached to
the main frame near the midpoint of the main frame by pivot. The
pivot is asymmetrically positioned relative to the axes of the crushing
rolls. An actuator between the main frame and the free end of the
roll carriage moves the roll carriage about the pivot to adjust
the gap between the first and second rolls. The jack can be equipped
with a servo motor responsive to a computer program.
Claims What is claimed is:
1. A two roll crusher comprising: a main frame; a first roll having
a longitudinal axis rotatably mounted on the main frame; a pivot
on the main frame; a carrier frame atop the main frame having a
first end and a second end, said first end being pivotally attached
to the main frame by the pivot and said second end being free to
move relative to the main frame; a second roll having a longitudinal
axis rotatably mounted on the carrier frame, the first and second
rolls being in an opposed spaced apart relationship defining a material
crushing gap between the first and second rolls; and an actuator
between the main frame and free end of the carrier frame to urge
the carrier frame about the pivot so as to raise or lower the carrier
frame on the main frame and move the second roll mounted on the
carrier frame relative to the first roll so as to adjust the crushing
gap between the first and second rolls.
2. The two roll crusher of claim 1 wherein the pivot is positioned
on the main frame in an asymmetric position relative to longitudinal
axes of the first and second rolls.
3. The two roll crusher of claim 1 wherein the actuator further
comprises a jack apparatus.
4. The two roll crusher of claim 1 wherein the actuator further
comprises a servomotor.
5. The two roll crusher of claim 1 wherein the actuator is controlled
by a computer program.
6. The two roll crusher of claim 1 further comprising a housing
on the main frame.
7. The two roll crusher of claim 1 further comprising a shroud
on the frame, the shroud having a material inlet opening and a material
discharge opening.
8. A roll type crushing apparatus comprising: a base frame; a first
crushing roll rotatably mounted at a fixed position on said base
frame; a roll carriage frame on the base frame, said roll carriage
having a first end of the frame attached to the base frame by a
pivot and a second end of the frame being moveable relative to the
base frame; a second crushing roll rotatably mounted on the roll
carriage frame, the first and second rotatably mounted crushing
rolls in cooperative opposition defining a crushing gap of a predetermined
dimension there between; an actuator mechanism at the free end of
the roll carriage frame for moving the roll carriage frame about
the pivot, wherein movement of the roll carriage frame about the
pivot moves the second crushing roll toward or away from the first
crushing roll in an arc to change the predetermined dimension of
the crushing gap between the first and second rotatably mounted
crushing rolls; and a drive apparatus for driving the first and
second rotatably mounted crushing rolls for a crushing operation.
9. In a roll crusher having a base frame, first and second rotatably
mounted crushing rolls having parallel longitudinal axes in cooperative
opposition to one another providing a material crushing gap between
the rolls of an appropriate dimension, and an apparatus for driving
the rolls for a crushing operation, the improvement comprising:
a roll carriage frame having a first end attached by a pivot to
the base frame and a second end, the second rotatably mounted crushing
roll being mounted on the roll carriage frame, said pivot being
asymmetrically positioned between the parallel axes of the recited
crushing rolls so that raising or lowering of the second end of
the roll carriage frame effects a pivotal movement of the roll carriage
to move the second rotatably mounted crushing roll relative the
first rotatably mounted crushing roll to adjust the material crushing
gap between the rolls without shutting down operation of the roll
crusher.
10. The improvement of claim 9 wherein the pivot is positioned
on the base frame nearer to the longitudinal axis of the first rotatably
mounted crushing roll than to the longitudinal axis of the second
rotatably mounted crushing roll.
11. The improvement of claim 9 further comprising an actuator for
raising or lowering the unattached end of the roll carriage.
12. The improvement of claim 11 wherein the actuator is controlled
by a software program.
13. The improvement of claim 11 wherein the actuator further comprises
a jack assembly.
14. The improvement of claim 9 wherein the second rotatably mounted
roll is spring biased within the roll carriage toward the first
rotatably mounted roll so as to permit sufficient deflection of
the rolls to pass non-crushable material between the rolls.
15. A two roll crusher comprising: a frame including a base frame
section and an upper frame section; a housing on the frame having
a material input opening and a crushed material output opening;
a first rotatably mounted crushing roll having a longitudinal axis
mounted in a fixed position on the upper frame section within the
housing; a movable crushing roll carriage frame section on the main
frame adiacent to the upper frame section and having a first end
attached to the base frame section and a second end that is free
to move relative to the main frame section; a second rotatably mounted
crushing roll having a longitudinal axis mounted on the crushing
roll carriage frame section in cooperative opposition to the first
rotatably mounted crushing roll providing a material crushing gap
of a predetermined dimension between the rolls; apparatus for adjusting
a preset tension on the second crushing roll to control deflection
of the second crushing roll when uncrushable material is introduced
between the crushing rolls; a pivot on the base frame section for
the pivotal attachment of the first end of the crushing roll carriage
frame section to the base frame, said pivot positioned on the main
frame between the first and second crushing rolls at a point that
is asymmetrical to the longitudinal axes of the first and second
crushing rolls, wherein movement of the second end of the crushing
roll carriage frame section effects movement of the crushing roll
carriage frame about the pivot to changes the dimension of the crushing
gap without affecting the preset tension on the second crushing
roll; an actuator assembly for effecting pivotal movement of the
roll carriage frame section about the pivot thereby varying the
material crushing gap between the rolls without changing the preset
tension on the second crushing roll; and a drive apparatus operatively
connected to the first crushing roll_for driving the first and second
rotatably mounted crushing rolls for a crushing operation.
16. The two roll crusher of claim 15 wherein the actuator assembly
is operatively associated with a computer program.
17. A closed loop crushing system, comprising: a roll crusher having
a base frame with a lower frame section and an upper frame section
a first rotatably mounted crushing roll having an axis of rotation
mounted in a fixed position on the base frame upper section; a crushing
roll carriage adjacent the upper frame section having a first end
attached to the base frame adiacent a midpoint of the roll crusher
and an unattached end; a second rotatably mounted crushing roll
having an axis of rotation carried_on the crushing roll carriage
in cooperative opposition to the first rotatably mounted crushing
roll providing a material crushing gap between the rolls dimensioned
to crush material to a desired size; a pivot on the base frame asymmetrically
positioned between the respective axes of rotation of the first
and second crushing rolls for pivotal attachment of the crushing
roll carriage to the base frame; a drive apparatus for driving the
first and second rotatably mounted crushing rolls for a crushing
operation; an actuator at the unattached end of the crushing roll
carriage for effecting pivotal movement of the roll carriage about
the asymmetrically positioned pivot to change the material crushing
gap between the rolls during operation of the crusher; a conveyer
system operatively associated with the two roll crusher discharge
opening to convey crushed material away from the two roll crusher;
and a separating apparatus operatively associated with the conveyer
system for separating crushed material of a desired size and returning
crushed material larger than the desired size to the conveyer for
transport back to the two roll crusher.
18. The closed loop crushing system of claim 17 further comprising
a computer operatively associated with the separating apparatus
and the actuator assembly, said computer being programmed to obtain
crushed material size data from the separating apparatus and to
operate the actuator assembly to adjust the crushing gap between
the rolls in response to the data.
19. The closed loop crusher system of claim 17 wherein the actuator
assembly further comprises a servo motor operatively associated
with the computer.
20. The closed loop crusher system of claim 17 wherein the separating
apparatus is a sizing screen apparatus.
21. A roll crusher comprising: a rectangular frame; at least one
laterally mounted crushing beam on the frame; and a crushing roll
in cooperative opposition to the crushing beam providing a material
crushing gap of a predetermined dimension between the crushing roll
and the crushing beam, said crushing roll mounted on a movable roll
carriage frame, said roll carriage frame having a rectangular configuration
with a first end attached to the frame by a pivot positioned asymmetrically
relative to the crushing beam and the crushing roll axis and an
unattached second end wherein a movement of the unattached end of
the roll carriage frame about the pivot moves the crushing roll
in an arc relative to the crushing beam to effect a change in the
dimension of the crushing gap between the crushing roll and the
crushing beam.
22. The roll crusher of claim 21 further comprising an actuator
for effecting pivotal movement of the roll carriage frame about
the pivot.
23. The roll crusher of claim 21 further comprising a drive means
for driving the crushing roll in a crushing operation.
24. The roll crusher of claim 22 employed in a closed loop crushing
system.
25. A two roll crusher comprising: a main frame; a first roll having
a longitudinal axis rotatably mounted on the main frame; a carrier
frame having a first end attached to the main frame and an unattached
second end; a second roll having a longitudinal axis rotatably mounted
in the carrier frame, the first and second rolls being in an opposed
spaced apart relationship defining a material crushing gap between
the first and second rolls; a pivot connecting said first end of
the carrier frame to the main frame, said pivot asymmetrically positioned
relative to the longitudinal axes of the first and second roll;
an actuator between the main frame and the unattached end of the
carrier frame to urge the carrier frame about the pivot to move
the second roll relative to the first roll so as to adjust the crushing
gap between the first and second rolls wherein said adjustment can
be made without stopping operation of the crusher.
26. A two roll crusher comprising: a box-like main frame and a
housing on the frame with a material inlet and a crushed material
discharge outlet; a first motor driven crushing roll is rotatably
mounted on the frame within the housing; a roll carriage having
a generally rectangular frame positioned atop the main frame, one
end of the roll carriage attached to the main frame near a midpoint
of the main frame by pivot, the opposite end of the roll carriage
being unattached; a second crushing roll mounted on the roll carriage,
the first and second crushing rolls being in an opposed, spaced
apart relationship defining a material crushing gap between the
first and second crushing rolls; tensioning apparatus operatively
connected to said second crushing roll to maintain an appropriate
preset tension on the second crushing roll to control deflection
of the roll when uncrushable material is introduced between the
first and second crushing rolls; said pivot connecting the crushing
roll carriage to the main frame being asymmetrically positioned
on the main frame nearer to the first crushing roll than to the
second crushing roll, wherein movement of the roll carriage about
the asymmetric pivot effects movement of the second crushing roll
relative to the first crushing roll so as to adjust the crushing
gap between the first and second crushing roll, said adjustment
capable of being effected without stopping operation of the crusher
and without affecting a change in the preset tension on the second
crushing roll.
27. The two roll crusher of claim 26 wherein the crushing gap between
the first and second crushing rolls can be adjusted from a gap of
approximately 1/8 inch to approximately one inch.
Description BACKGROUND OF THE INVENTION
The invention relates generally to crushers and, more particularly
to a roll crusher having an improved apparatus for adjusting the
crushing gap and a method of adjusting the rollers to change the
size of the crushed material.
Generally speaking, roll crushers are employed to crush solid material,
such as rock or coal. Two roll crushers consist of two parallel
rotating crushing rolls, which are spaced apart an amount corresponding
to the desired product or particle size of the crushed material.
The rolls are driven in opposite directions so that the material
to be crushed is drawn into the rolls and discharged from the crusher.
The material can be discharged onto a conveyer or other appropriate
apparatus for receiving or removing the crushed material. The material
also can be conveyed to sizing screens of a particular mesh to separate
product of a desired size.
To adjust particle size of the crushed product, the distance between
the two rolls, referred to as the crushing gap or nip, is adjusted.
To obtain crushed particles of generally smaller size, the gap between
the two rolls is reduced in width. To obtain larger crushed particles,
the gap is widened. In conventional two roll crushers, one roll
is mounted on the crusher frame so as to be moveable toward or away
from a stationary roll in a horizontal plane. In general, the movable
roll is positioned on a frame and urged toward a fixed roll by springs.
Springs are used so that uncrushable material can pass through the
crusher by momentarily enlarging the gap between the rolls without
damaging the crusher. The spacing between the rolls is varied and
maintained by the placement of shims.
The space between the rolls is adjusted not only to change the
crushed particle size, but also to retain uniform spacing in the
event the rolls wear down. In any event, heretofore the known procedures
for adjusting the crushing gap require a shut down of the crusher
resulting in downtime, take considerable time and effort, and require
the use of rather elaborate springs, shims and hydraulic rams.
SUMMARY OF THE INVENTION
It is among the several objects of the present invention to provide
a two roll crusher having an improved mechanism for adjusting the
crushing gap between the opposed crushing rolls.
Another aspect of the present invention to provide a two roll crusher
in which the crushing gap between the opposed crushing rolls can
be adjusted by a relatively easy, rapid and safe method.
Another aspect of the present invention to provide a roll crusher
in which the principles for adjusting the crushing gap can be imparted
to a single roll crusher, if desired.
In accordance with the invention, briefly stated, an improved two
roll crusher is provided having a box-like main frame and a housing
on the frame with a material inlet and a crushed material discharge
outlet. A first motor driven crushing roll is rotatably mounted
on the frame within the housing. A second crushing roll is mounted
on a roll carriage and also positioned within the housing. The first
and second crushing rolls are in an opposed, spaced apart relationship
defining a material crushing gap between the first and second rolls.
The roll carriage is a generally rectangular frame position atop
the main frame. One end of the roll carriage is attached to the
main frame near the midpoint of the main frame by pivot. The opposite
end of the roll carriage is free. The pivot connecting the crushing
roll carriage to the main frame is asymmetrically positioned on
the main frame relative to the rotational axes of the crushing rolls.
More specifically, the pivot is positioned nearer to the first crushing
roll than to the second crushing roll.
An actuator, which in the illustrated embodiment is a worm screw
jack, is mounted between the main frame and the free end of the
roll carriage. The actuator is used to move the roll carriage about
the pivot. Because the pivot is asymmetrically positioned, as the
roll carriage is pivoted up, the second crushing roll mounted on
the roll carriage moves in an upward arc toward the first crushing
roll, thereby decreasing the crushing gap between the first and
second crushing rolls. Likewise, a lowering of the roll carriage
moves the second crushing roll away from the first crushing roll
to widen the crushing gap. The operator can precisely manipulate
the actuator to effect known incremental changes in the gap size.
The actuator can be equipped with a servo motor. The servo motor
can operate the actuator in response to operator commands or in
response to a computer program which, in a closed loop system, appropriately
actuates the servo motor in response to the size of crushed material
which is sampled along the closed loop, preferably at a sizing screen
apparatus. Hence, in the closed loop system, the crushing gap can
be adjusted, automatically, in response to crushed material sample
size so as to maintain a desired crushed product size.
These and other aspects and advantages of the invention will be
apparent to one skilled in the art upon review of the following
specification and accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a isometric view of the improved two roll crusher of
the present invention with the roll carriage in a slightly elevated
position;
FIG. 2 is another isometric view of the improved two roll crusher;
FIG. 3 is a side elevational view of the improved two roll crusher
of the present invention with the roll carriage in a lowered position;
FIG. 4 is a side elevational view of the side opposite that shown
in FIG. 3;
FIG. 5 is a top plan view thereof;
FIG. 6 is an end plan view thereof;
FIG. 7 is a side elevation, partially schematic, illustrating the
relative positions of the opposed crushing rolls with the roll carriage
in its lowered position;
FIG. 8 is a side elevation, partially schematic, illustrating the
relative positions of the opposed crushing rolls with the roll carriage
in an elevated position; and
FIG. 9 is a diagram illustrating a closed loop system including
an improved two roll crusher of the present invention
Corresponding reference numeral indicate like structure throughout
the various drawings.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A novel roll crusher of the present invention is indicated generally
by reference numeral 10 in the drawings. Roll crusher 10 includes
main frame 12 which, in general, has a box-like configuration with
a base section 13 including a steel beam skeleton 14 and rolled
plate side walls 15 a midsection 16 also having a framework 17
and, at one end, an upper framework 18. The main frame 12 defines
a discharge opening and, as shown, main frame 12 includes open ends
19 20 which allow a conveyer (FIG. 7) or other removal apparatus
to be positioned within the frame to collect discharged material.
As seen in FIGS. 1 and 2 midsection 16 includes at least one cross-member
21. The precise construction of the described frame sections is
incidental to the instant invention.
A roll carriage 22 is positioned atop midsection 16 of the frame
at the end opposite the upper framework. Roll carriage 22 generally
is a rectangular framework, similar in construction and appearance
to the upper framework 18. The forward end 23 the end of roll carriage
22 is positioned near the midpoint of crusher. The roll carriage
frame has an attachment flange 25 which extends down from the bottom
corner on one side of the forward end of the carriage, and a second
attachment flange 26 which extends down from the opposite bottom
corner on the forward end of the carriage. Hence, when the carriage
22 is in position there is an attachment flange on each side of
the midsection of the main frame. Each flange has an opening (not
seen) in its center. The roll carriage 22 is attached to the main
frame 12 by a pivot axle 28 extending through flange 25 and flange
26 and secured in place by nuts 29 on threaded ends of the pivot
axle 28 or by other acceptable structure.
A first crushing roll 30 having concentric shaft 30a, is mounted
on the upper framework 18 in a manner known to the art. That is,
the shaft 30a is appropriately journaled in bearings 31 and 32 to
permit free rotation of the roll. A second crushing roll 33 having
a concentric shaft 33a, is appropriately mounted in roll carriage
22 with each end of shaft 33a journaled in bearings 34 and 35. The
first and second crushing rolls 30 and 33 respectively, are positioned
in an opposed, spaced apart relationship defining a material crushing
nip or gap G between the first and second rolls. Gap G can be any
desired dimension. Generally, however, the spacing between the rolls
ranges from 1/8 inch to 1 inch. The crushing rolls may have a smooth
exterior surface or may toothed, depending upon the application.
Crushing roll 33 is spring biased toward roll 30 by springs 36
37 and 38 40 positioned at mounting plates for bearings 34 and
35 respectively. Roll 33 is appropriately restrained from linear
movement toward roll 30 by stop plates or other means. Consequently,
roll 33 is a predetermined distance from roll 30. The recited springs
are positioned between roll 33 and the hydraulic rams 42 and 44
so as to set the appropriate spring tension on the springs to control
deflection of roll 33 when uncrushable material is introduced between
the rolls.
An actuator mechanism, indicated generally by reference number
50 is securely mounted between free end 24 of the carriage 22 and
the frame work. In the illustrative embodiment, the bottom of the
actuator mechanism is mounted on cross-member 21 and the top is
attached to the roll carriage. As shown, actuator 50 is a hand operated
jack 52 of conventional worm gear design. The jack 52 has a hand
wheel 54 positioned for convenient access by an operator. Turning
of hand wheel 54 in the appropriate direction causes the jack shaft
55 to rise and to urge the carriage 22 upwardly. It will be understood
that because the pivot point of the carriage 22 is asymmetrically
position, as described above, the crushing roll 33 carried on the
carriage 22 not only will move upwardly but also will move toward
the opposed crushing roll 30 in a predetermined arc. The carriage
22 also can be lowered by reversing the jack to lower free end 24
of the carriage, moving the roll 33 away from roll 30. As will be
explained in greater detail below, the operator can adjust gap G
simply by raising or lowering carriage 22 via the actuator.
It is possible to determine the exact number of revolutions of
the jack hand wheel required to move roll 33 a given increment of
distance toward roll 30. For purposes of illustration only, it could
be established, for example, one revolution of hand wheel 54 moves
crushing roll 33 one-eighth (1/8) inch. In that illustrative scenario,
if the operator desired to adjust the crushing gap G by 1/8 he
would rotate hand wheel 54 one revolution in the appropriate direction.
Hence, the novel two roll crusher of the present invention allows
for the precise, easy and efficient adjustment of the crushing gap
G.
Although the actuator is shown as a jack, it will be understood
that other embodiments of an actuator are contemplated by the present
invention. Other examples are hydraulically operated piston mechanisms
or lifts, or other types of jack assemblies such as a scissors jack.
Hence, the appended claims are intended to encompass any type of
actuator that can effect the pivotal movement of the roll carriage
22 about pivot 28.
The crushing area of crusher 10 which includes crushing rolls
30 33 can be exposed, but preferably is covered by a housing or
shroud 60. The shroud 60 can have any configuration that encloses
the crushing area, including the rolls. The shroud 60 includes an
material inlet opening 62 which is positioned above the crushing
gap G, for introduction of material to the crushing area. In the
illustrated embodiment, the material inlet opening 62 includes an
optional hopper 64. Likewise, the shroud would include a discharge
opening (not shown) on its bottom side, positioned within the main
frame 12.
The opposed crushing rolls 30 33 perform their crushing operation
in typical fashion. Fixed crushing roll 30 is driven by a conventional
electric motor 66 such as a 10 horsepower, 1200 rpm, class F motor.
Motor 66 is connected by a belt drive 68 to a shaft-mounted reducer
69 on one end of shaft 30a. The motor 66 thus drives roll 30 about
its axis at the appropriate rpm's in the operative direction. As
shown in FIGS. 1 and 5 there is a first tire 70 on a shaft-mounted
wheel 72 mounted on the opposite end of shaft 30a. There is a second
tire 74 on a shaft-mounted wheel 76 on the corresponding end of
the shaft 33a. The recited tires are in frictional contact so that
when roll 30 rotates about its axis, tire 70 effects rotation of
tire 74 and crushing roll 33 in the opposite direction (FIG. 1).
Material for crushing is directed toward crushing gap G through
material inlet opening 62. The oppositely rotating crushing rolls
30 34 crush the material impinged between the rolls. The crushing
material is discharged out of the bottom of the crusher and collected
or conveyed away. The crushed material can be sampled for size.
In the event the operator desires crushed material of a different
size, or in the event the rolls wear, he can adjust the dimension
of the crushing gap G, as follows, without interrupting operation
of the crusher.
FIGS. 7 and 8 graphically illustrate how the adjustment of the
crushing gap G between opposed crushing rolls 30 and 33 is effected
by the pivotal movement of the roll carriage 22. Pivot point P is
positioned asymmetrically relative to axes of the crushing rolls,
i.e., the distance D1 between the axis of roll 33 and pivot P is
less that the distance D2 between the axis of roll 33 and pivot
P. In FIG. 7 the roll carriage 22 is in a first or lowered position.
In this position, the gap G1 between the rolls is at a wider predetermined
dimension. The gap G1 is set by positioning of roll 33 in carriage
22 by the adjustment of the previously described hydraulically biased
springs and stops, as known in the art. As illustrated in FIG. 8
elevation of the free end 24 of carriage 22 by actuator 50 effects
rotation of the carriage about asymmetric pivot P. Roll 33 not only
is elevated with the carriage, but it is moved closer to roll 30
resulting in a narrowed gap G2. It will be understood that G1 and
G2 can be of any desired dimension, as required by the crushing
application. Also, it will be understood that rolls 30 and 33 are
not required to be aligned in a horizontal plane to perform the
crushing function. The rolls function perfectly well when roll 33
is elevated relative to roll 30 as shown in FIG. 8.
As illustrated by FIG. 9 a roll crusher of the present invention
can be employed in a closed loop system that provides for automated
sampling and automated adjustment of gap size in response to crushed
material sample size. The material M to be crushed is introduced
to the roll crusher and is crushed. The crushed material is discharged
onto a conveyer system and moved away from the crusher. The crushed
material is directed to a sizing apparatus, such as a screening
apparatus. Crushed material of the desired dimension passes for
removal. If the crushed material is too large, for example, it is
conveyed back to the crusher. The sizing apparatus can be operatively
connected to a computer operated by appropriate software. Periodic
sampling is conducted, for example by weighing retained crushed
material. If an excess of crushed material is retained, it could
indicate that the gap G is too wide. The computer program analyzes
the sampling data and determines that the gap G should be narrowed.
The computer is operatively connected to a servo motor designed
to drive the actuator. The computer software is programmed to control
the servo motor to operate the actuator so as to raise the crushing
roll carriage to move the second crushing roll closer to the first
crushing roll. Of course, the sizing apparatus and computer program
can be designed to detect crushed material that is smaller than
a target size and can automatically widen the crushing gap in the
same manner. The foregoing description of one embodiment of a feedback
loop system is for illustrative purposes only. Any closed loop system
that incorporates appropriate apparatus for the sampling of crushed
material and automated adjustment of the crushing gap in response
to the sample size is intended to be within the scope of the invention
and the appended claims.
The present invention could be modified to provide adjustment between
a crushing roll and opposed crushing beams in a single roll crusher.
The crushing beams can be suspended between the walls of the crusher
housing in the approximate position of crushing roll 30 shown in
FIG. 3. A second, opposed crushing roll 33 would be positioned on
the roll carriage 22 as previously described. The pivot axle 28
could be asymmetrically positioned with regard to the axis of crushing
roll 33 and the horizontal center line of the crushing beams. That
is, the pivot would be positioned toward the crushing beams. The
roll carriage 22 can be moved about the pivot point, as previously
described, to adjust the crushing gap between the crushing roll
and the fixed crushing beams. It would be understood, however, that
the rotatable crushing roll would be mounted on the roll carriage
would be motor driven, by a motor 66 through a shaft mounted reducer
69 attached to shaft 33a of crushing roll 33. The drive mechanism
could be assembled so as to allow pivotal movement of the driven
roll. For example, a motor could be attached to the crushing roll
33 by a drive belt 68 having a tension pulley assembly to prevent
slack in the drive belt as the crushing roll 33 is pivoted closer
to the motor 66. Likewise, a drive chain and an adjustable tension
sprocket assembly or derailleur may be employed.
Various changes and modifications may be made in the improved roll
crusher of the present invention without departing from the scope
of the appended claims. Therefore, the foregoing specification and
accompanying drawings are intended to be illustrative only, and
should not be construed in a limiting sense. |