Abstrict A system for fixing the mobile jaw on a conical head of a cone
or giratory stone crusher, includes a bowl, with a feed hopper mounted
thereon, a fixed truncated jaw mounted coaxially with the bowl,
a crushing head mounted on a main shaft coaxial with the fixed jaw
and a conical mobile jaw mounted on the head and clamped thereon
by a locking element integral with the head and pressing on the
top of the mobile jaw. The element has on its outer periphery notches
radially oriented outwards and uniformly distributed on the periphery
and the mobile jaw has, on its inner periphery, at its openings
studs radially oriented inwards, uniformly distributed on the periphery
and matching in number the notches, the studs penetrating when mounted
in the notches so as to secure the locking element and the mobile
jaw in rotation when the crusher is operating.
Claims 1. System for securing the movable jaw on a conical head of a conical
or gyratory stone crusher, comprising a bowl, surmounted by a hopper
for supplying material to be crushed, a fixed truncated conical
jaw mounted coaxially of the bowl, a crushing head mounted on a
principal shaft coaxial to the fixed jaw, whose geometric axis makes
an acute angle with that of the drive shaft so as to communicate
to the head a nutatory movement when the eccentric turns, and a
conical movable jaw having a circular opening at its summit, mounted
on the head and gripped on the latter by means of a blocking element
secured to the head and bearing on the summit of the movable jaw,
characterized in that said element (16) has on its external periphery
notches (15) directed radially outwardly and regularly spaced about
said periphery, and that the movable jaw (4) has on its internal
periphery at the level of its opening, lugs directed radially inwardly,
regularly spaced about said periphery and in number equal to said
notches (15), the lugs penetrating in the assembled condition into
said notches so as to secure the blocking element (16) and the movable
jaw (4) in rotation during operation of the crusher.
2. System for securement of the movable jaw according to claim
1 characterized in that the number of lugs and notches is equal
to four.
Description [0001] The present invention relates to a system for securing the
movable jaw of a cone or gyratory crusher. Cone crushers and gyratory
crushers are adapted for mine or quarry installations and serve
for the reduction of the size of the granulates and minerals to
the dimensions required for their ultimate use.
[0002] They comprise a truncated conical crushing bowl, whose wall
supports a fixed jaw, and a conical head bearing the movable jaw
mounted on a shaft coaxial to the bowl. The geometrical axis of
the conical head forms at the summit of this latter a certain angle
with the axis of the principal shaft, which gives to the head, when
the eccentric turns, a nutatory movement. During descent into the
bowl, the materials are progressively crushed so as to reach the
dimension of the smallest space r beteen the fixed jaw and the movable
jaw, at the level of the base of the head in nutation and located
at 2 in FIG. 1 showing a cone crusher.
[0003] The cone crusher according to FIG. 1 comprises a supply
hopper 8 located above the opening 1 of a crushing chamber or bowl
3. The crushing head 5 is supported by a shaft 10 above a bearing
for this latter, with its geometric axis forming, thanks to an eccentric
12 an axis .alpha. with the axis of the shaft so as to have a nutatory
movement when the eccentric 12 turns. The fixed jaw 11 is fixed
below the opening 1 in the upper part of the bowl 3.
[0004] The movable jaw 4 is mounted on the head 5 and rests in
its lower portion on the head 5 whilst it is gripped at its upper
portion on the head by a screw 6 by means of a ring 7. This gripping
is effected by a component of the gripping force of the screw 6
directed along the generatrix of the cone of the movable jaw 4.
[0005] In the course of the crushing operation, the pieces which
wear down the most quickly are the jaws and particularly this movable
jaw 4. Because of this, the latter must be periodically changed
after wear. Thus, when the material to be crushed is constituted
by pure silica, the lifetime of the jaw 4 cannot exceed several
tens of hours. On the other hand, when it is a matter of limestone,
this lifetime can extend to several years.
[0006] To this end, it is fixed immovably on the head by means
of the screw 6. This gripping of the screw 6 requires a very high
force so as to avoid the jaw knocking against the head. To grip
it, there is generally used a key on which the operator taps with
a sledgehammer. Moreover, in the course of operation, the movable
jaw 4 has the tendency to turn on the head but, with this movement,
it drives the screw 6 which self locks while holding the jaw. The
self locking of the screw ensures that disassembly also requires
the application of a very high force. So as to facilitate disassembly,
a ring 7 is interposed between the screw head and the upper edge
of the movable jaw. For disassembly, this ring is cut with a blowtorch
and removed with a suitable tool, which frees the screw but which
can then turn freely.
[0007] So as to facilitate assembly and disassembly of the jaw,
according to French patent application No. 02 09256 the securement
system comprises a blocking element, whose diameter is at least
equal to that of the summit of the cone of the movable jaw, which
is provided with holes spaced about its periphery, into which are
threaded screws which screw into tappings located in the head or
are pre-secured with this latter.
[0008] According to one embodiment of the cone crusher disclosed
in that application, the blocking element is constituted by two
parts, by a blocking plate provided with holes distributed about
its periphery, and a blocking stud located therebelow, screwed into
an axial tapping in the head and secured in rotation with said plate,
the gripping taking place by means of screws passing through the
holes of the plate and locking into the tappings provided in the
blocking stud.
[0009] With further respect to that application, in the case of
a gyratory crusher, the blocking element is constituted by a blocking
ring provided with holes distributed about its periphery; a blocking
nut, screwed on the shaft above the head and secured in rotation
with said blocking ring, the gripping taking place by means of screws
passing through the holes of the blocking ring and screwing into
the tappings provided in said blocking nut.
[0010] The solution according to that mentioned application is
quite suitable to facilitate assembly and disassembly of the movable
head. However, strong gripping is still necessary to prevent the
jaw from turning relative to the blocking plate or relative to the
gripping nut (gyratory crusher). There must accordingly be found
a solution to the problem of securing in rotation the plate (or
the nut) and the jaw.
[0011] To solve this problem, the present invention provides in
a system that said element has on its external periphery radially
outwardly directed notches regularly spaced about said periphery,
and that the movable jaw has, on its internal periphery, at the
level of its opening, lugs directed radially inwardly, regularly
spaced about said periphery and of a number equal to said notches,
the lugs in the assembled condition being disposed in said notches
so as to secure the blocking element and the movable jaw in rotation
during operation of the crusher.
[0012] According to the invention, the number of lugs and notches
is preferably equal to four. It can however be fewer or more, given
that the number of notches is at least equal to the number of lugs.
[0013] The invention will be better understood from a non-limiting
embodiment described hereafter and shown in the accompanying drawings,
in which are shown:
[0014] FIG. 1: A schematic cross-section of a cone crusher according
to the prior art;
[0015] FIG. 2: A top perspective view of the movable jaw according
to the present invention;
[0016] FIG. 3: A schematic cross-section of the securement of the
movable jaw of a cone crusher according to the invention;
[0017] FIG. 4: A cross-sectional view on the line IV-IV of FIG.
3.
[0018] As shown in FIG. 3 the movable jaw 4 is disposed on the
conical head 5 and conventionally rests, as shown in FIG. 1 on
the lower wide portion of the conical head. Its gripping in this
position takes place by means of a blocking element constituted
by a screw in two parts, a blocking plate 16 whose diameter is at
least equal to the external diameter, at its upper portion, of the
cone formed by the jaw 4 and a screw-threaded lug 13 secured to
the plate by screws 17.
[0019] A protective cap 23 for the heads of the screw 17 is also
provided on the blocking plate and simply fixed on this latter with
a screw.
[0020] As is indicated above for the prior art, the rotation of
the jaw 4 during operation relative to the head 5 produces a self-gripping
of the piece 16 13 and thus permits holding a suitable gripping
despite wear of the jaw.
[0021] However, in operation, when the jaw 4 slides on the head
despite substantial gripping, it also slides relative to the blocking
plate 16 in its rotation. This latter then only partially transmits
the rotational couple to the lug 13 by the screws 17.
[0022] To ensure securement of the jaw 4 and the blocking plate
16 the lugs 14 are provided on the internal periphery of the jaw
4 at the level of its upper opening. Notches 15 are of corresponding
shape and equal number are provided on the periphery of the blocking
plate 16. Notches and lugs are regularly spaced about said peripheries
so as to engage with each other.
[0023] In this way, during operation of the crusher, a rotation
of the jaw 4 gives rise to a rotation of the blocking element 16
and a self-gripping of the couple constituted by the blocking plate
16 and the lug 13 hence a self-gripping of the jaw 4 on the head
5.
[0024] The same system of lugs and notches can be applied to the
gyratory crusher, to secure the gripping lug and the jaw together.
[0025] FIG. 4 shows a cross-section of the system at the level
of the opening of the cone forming the jaw 4. In the illustrated
example, four lugs and four notches are provided. But there could
be provided a lesser or a larger number of lugs and notches. |