Abstrict The crusher bowl clamping device comprises a stationary carrier
ring screw-threaded to the bowl, a cylindrical bush mounted on the
top end of the carrier ring, and a flange arranged above the bush
carrying hydraulic jacks to provide a clamping thrust in the threads
between the bowl and the carrier ring. The flange is matched and
meshed by means of threads with the crushing bowl and is locked
against rotation with respect to the carrier ring, and the hydraulic
jack piston rods bear against the cylindrical bush.
Claims We claim:
1. A crusher bowl clamping device comprising:
a stationary carrier ring threadably connected with a crushing
bowl;
a cylindrical bush mounted on the top end of said carrier ring;
a flange arranged above said cylindrical bush and threadably connected
to said crushing bowl, said flange carrying hydraulic jacks with
piston rods to provide thrust in the threaded connection between
said crushing bowl and said carrier ring;
said flange being locked against rotation about said carrier ring;
and
said piston rods of said hydraulic jacks being continuously biased
against said carrier ring, so as to thrust load the threaded connection
between said flange and said carrier ring with the crushing bowl.
2. A device in accordance with claim 1 further including a washer
between said piston rods of said hydraulic jacks and said cylindrical
bush and said washer is locked against rotation about said carrier
ring.
Description FIELD OF THE INVENTION
The present invention relates to intermediate and fine cone crushers,
and more particularly to crusher bowl clamping devices.
The invention can most advantageously be used in the construction
and ore-mining and dressing industries.
BACKGROUND OF THE INVENTION
The intermediate and fine cone crushers, which are now in use,
comprise a crushing bowl and a breaking head accommodated therewithin
to provide cavity, which cavity is terminated at its bottom portion
with a discharge gap defined by the shortest distance between the
crushing surfaces.
The breaking head is mounted on a spherical support secured to
the crusher frame. The bowl is screw-threaded into a carrier ring
mounted on the crusher frame. The breaking head drive is equipped
with an eccentric or out-of-balance weight. Mounted on the crushing
bowl and the breaking head are liners shaped as removable taper
shells.
As a result of intensive wear of the liners, the discharge gap
between their crushing surfaces becomes larger, resulting in coarser
products being discharged from the crushing chamber. To stabilize
the crushing process, the discharge gap is periodically adjusted,
thus bringing it to the initial set value.
To adjust the discharge gap between the crushing bowl and the breaking
head, the bowl is rotated in the threads and is then clamped with
respect to the carrier ring. Clamping is accomplished with power
means providing a thrust in said threads.
The bowl clamping device is one of the most critical units of the
crusher because of high impact loads generated in the crushing cavity.
Known in the art is a device for clamping the bowl of intermediate
and fine crushers (cf. USSR Inventor's Certificate No. 298377).
The device comprises a stationary carrier ring screw-threaded to
the bowl, a cylindrical bush mounted on the top end of the carrier
ring, a flange arranged above the bush, and wedge jacks are used
to provide a clamping thrust in the threads between the bowl and
the carrier ring.
In this device, the cylindrical bush is screw-threaded into the
crushing bowl and rests upon the carrier ring through the wedge
jacks which are placed in annular recesses of the bush and carrier
ring.
The wedge jacks are fashioned as superimposed pairs of oppositely
directed wedges. When the cylindrical bush is rotated to lock the
bowl, the upper wedges, under the action of the force of friction,
start slipping against the lower ones and shifting in the vertical
plane, thereby providing a clamping thrust in the threaded joints
of the bowl with the carrier ring and the bush. With the cylindrical
bush rotated in the opposite direction, the upper wedges start slipping
downward along the inclined surfaces of the lower wedges, which
results in elimination of the upthrust in said threads.
However, the wedge jacks fail to provide a reliable clamp of the
bowl in the threads since vibrations of the bowl and the carrier
ring caused by crushing blows or impact loads in the crushing cavity
eliminate the force of friction developed between the wedges, which
sets the bowl free to rotate back out, followed by possible failure.
Moreover, the wedge jacks are complex in manufacture.
Also known in the art is a crusher bowl clamping device (cf. U.S.
Pat. No. 3797760). The device comprises a stationary carrier ring
screw-threaded to the bowl, a cylindrical bush mounted on the top
end of the carrier ring, and hydraulic jacks provide a clamping
thrust to the threads between the bowl and the carrier ring. In
this arrangement, as well as in the above analogue, the cylindrical
bush is screw-threaded to the bowl. Arranged between the carrier
ring and cylindrical bush at uniformly spaced points on the circumference
are hydraulic jacks provided with spring-actuated rams. The hydraulic
jacks have their cylinders seated in nests of the carrier ring,
and the tips of their rams are seated in nests of the cylindrical
bush. In the construction under consideration, the thrust in the
threads to clamp the bowl results from the total action of a plurality
of springs arranged under the rams of the hydraulic jacks. To permit
the bowl to rotate, the thrust in the threads is eliminated by supplying
oil under high pressure into the hydraulic cylinders. The rams therewith
compress the spring stacks to thereby release the pressure of the
piston rods upon the cylindrical bush. The rams are maintained in
this position until the adjustment of the discharge gap between
the bowl and the breaking head is completed. The oil pressure is
then released and the springs of the hydraulic jacks again act through
the piston rods upon the cylindrical bush that eliminates the clearance
and provides a thrust in the threads between the bush and the bowl,
as well as in the threads between the bowl and the carrier ring.
However, such design features low reliability. This is attributed
to the fact that the hydraulic cylinders not only clamp the cylindrical
bush but completely lock it, preventing it from slipping, whereas
the bush tends, under the action of the force of friction, to rotate
together with the bowl, while adjusting the discharge gap. This
causes misalignment of the rams, damage of their sealings, scores
on the walls of the hydraulic cylinders, and deformation of the
piston rods. All these factors taken together generally make the
device inoperative.
Moreover, the hydraulic cylinders are housed in a rotatable casing,
making it impossible to watch their operation and deal quickly in
time with any fault found.
Also known in the art is a crusher bowl clamping device (cf. USSR
Inventor's Certificate No. 502655). The device comprises a stationary
carrier ring screw-threaded to the bowl, a cylindrical bush mounted
on the top end of the carrier ring, and a flange arranged above
the bush and carrying hydraulic jacks to provide a thrust in the
threads between the bowl and the carrier ring.
In the device under consideration, the cylindrical bush is screw-threaded
into an intermediate bush locked against rotation about the carrier
ring and serves to support the flange. The cylindrical bush is also
intended to rotate the bowl in the threads and is provided for torque
transmission with a slot to receive a projection of the bowl. In
projections arranged at uniformly spaced points on the circumference,
there are secured piston rods of the hydraulic jacks mounted on
the flange. Placed under the rams of the hydraulic jacks are stacks
of springs serving to apply, via piston rods, a clamping upthrust
in the threads between the bowl and the carrier ring. With the oil
supplied under pressure into the hydraulic jacks, the spring stacks
are compressed and the piston rods go downward, thereby eliminating
the thrust in said threads. The bowl is then rotated with the aid
of the cylindrical bush until the required discharge gap between
the bowl and the breaking head is set. The flange carrying the hydraulic
jacks is brought, through the piston rods, into rotation together
with the bowl. The intermediate bush is shifting in a vertical direction
together with and by the same value as the bowl and, therefore,
retains its contact with the flange. Upon the adjustment of the
discharge gap, the oil pressure is released and the spring stacks
re-establish, through the piston rods, the upthrust in the threads
between the bowl and carrier ring, thereby providing the clamp required.
This device is more reliable as compared with the above analogue,
since it affords the rotation of the flange with a less frictional
force to overcome, than it is in the threads.
However, in such a case, misalignment and jamming of the rams in
the hydraulic jacks may occur.
Furthermore, the rotation of the hydraulic jacks together with
the flange interferes substantially with the maintenance of the
device under consideration. The rotation of the bowl is to be periodically
interrupted to rearrange the oil-supplying hoses. This additional
operation entails a prohibitive penalty of lost time.
Moreover, the device in question is complex in design.
SUMMARY OF THE INVENTION
It is an object of the present invention to increase the reliability
of the crusher bowl clamping device.
Another object of the present invention is to simplify the operation
of the crusher bowl clamping device.
A further object of the present invention is to cut down lost time
when operating the crusher bowl clamping device.
Still another object of the present invention is to simplify the
design of the crusher bowl clamping device.
With these and other objects of the present invention in view,
there is provided a crusher bowl clamping device comprising a stationary
carrier ring matched and meshed with the bowl, a cylindrical bush
mounted on the top end of the carrier ring, and a flange arranged
above the bush and carrying hydraulic jacks to provide thrust in
the threads between the bowl and carrier ring, and wherein the flange
is matched and meshed with the bowl and is locked to prevent its
rotation with respect to the carrier ring, and the hydraulic jack
piston rods bear against the cylindrical bush.
It is an advantage of the present invention that the power means
of the hydraulic jacks are not subjected to the action of the deforming
lateral loads during bowl rotation.
A further advantage of the present invention is that the flange
carrying the hydraulic jacks remains stationary, while the device
is in operation, thereby making unnecessary the periodical rearrangements
of the oil-supplying hoses of the hyraulic jacks.
Such a design eliminates slipping and damaging of the piston rods
when the bowl and the cylindrical bush are brought into rotation,
since, in this case, the piston rods rest upon a stationary washer.
BRIEF DESCRIPTION OF DRAWINGS
The present invention will now be explained by detailed description
of the preferred embodiments of the invention, and with reference
to the accompanying drawings, wherein:
FIG. 1 is a longitudinal sectional view of a crusher bowl clamping
device; and
FIG. 2 is a view of one modification of the invention, wherein
there is a washer between the push rods of the hydraulic jacks and
the cylindrical bush.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1 the crusher bowl clamping device comprises
a bowl 2 matched and meshed through threads 1 with a stationary
carrier ring 3. Also a cylindrical bush 4 is mounted on the top
end 5 of the carrier ring 3 and a flange 6 is arranged above the
cylindrical bush 4 and carries hydraulic jacks 7 provided with rams
8 having piston rods 9 and stacks of disc springs 10. The piston
rods 9 continuously bear and press against the top end 11 of the
cylindrical bush 4. The flange 6 is provided with ears 12 having
openings 13 to receive pins 14 which are rigidly secured to the
carrier ring 3. The flange 6 is matched and meshed through threads
15 with the bowl 2 and clamps 16 secure a liner 17 and a feed chute
18. Provided in the bowl 2 is a vertical slot 19 to receive a projection
20 of the cylindrical bush 4.
Referring now to FIG. 2 there is shown a modification, wherein
there is a washer 21 mounted between the piston rods 9 and the end
11 of the cylindrical bush 4 and said washer has ears 22 having
openings 23 to receive the pins 14 which are used to lock the washer
21 as well as the flange 6 with respect to the carrier ring 3.
The crusher bowl clamping device of the present invention operates
as follows.
Where a need arises to adjust the discharge opening between the
crushing bowl and the breaking head, oil is supplied under pressure
to the hydraulic jacks 7. By so doing, the rams 8 with the piston
rods 9 are shifted upward to compress the stack of the springs 10
and release the thrust loading in the threads mating the flange
6 and carrier ring 3 with the crushing bowl 2. The rotation of the
cylindrical bush 4 is imparted, with the aid of the projection 20
to the bowl 2 which is rotated until the required discharge gap
is set. With the bowl 2 in rotation, the flange 6 and the washer
21 remain fixed with respect to the carrier ring 3. The oil pressure
in the hydraulic jacks 7 is then released and the stacks of the
springs 10 return the rams 8 with the piston rods 9 into their initial
position. Upon being biased against the washer 21 the piston rods
9 cause the flange 6 and hence, through the washer 21 the bowl
2 to go upward. By so doing, clearance is eliminated and the clamping
thrust is developed in the threads 1 and 15 which in turn ensures
a reliable clamping of the bowl 2 with respect to the carrier ring
3.
The proposed crusher bowl clamping device makes it possible:
to increase the reliability of clamping the bowl;
to decrease the labor in the maintenance of the structure;
to cut down lost time when maintaining; and
to simplify the design.
Although the present invention has been described in some detail
by way of illustration and example for purposes of clarity of understanding,
it will, of course, be understood that various changes and modifications
may be made in the form, details, and arrangements of the parts
without departing from the scope of the invention as set forth in
the following claims. |