Abstrict At least one core hole is provided adjacent an edge of a rock crusher
component and removably receives a connector capable of attachment
to a lifting line. In one embodiment, the connector is a bolt and
the core hole has an enlarged portion for receiving a nut in a non-rotating
fit. The nut receives a set screw plug when the bolt is removed.
In another embodiment a hook and eye member is employed and the
hook portion thereof engages the enlarged portion of the core hole.
The connector includes a bracket that connects it with a lift line.
Claims Having thus described our invention, we claim:
1. A rock crusher comprising:
a rock engaging component removably mounted in said crusher,
said rock engaging component having upper and lower ends and also
having a wall thickness with a rock crushing outer surface and an
opposite surface,
a core hole extending through the wall thickness of said rock engaging
component between said rock crushing outer surface and said opposite
surface and located adjacent the upper end of said rock engaging
component,
said core hole forming lifting receptacle means,
and a connector removably mounted in said lifting receptacle means
to which a lifting line from powered machinery is arranged to be
attached.
2. A mantle for a rock crusher comprising:
a cone-shaped member having upper and lower ends and also having
a wall thickness with a rock crushing outer surface and an opposite
surface,
said cone-shaped member being removably mounted on a support in
said crusher with a spacing between said opposite surface and said
support,
a backing filler in said spacing between said opposite surface
and said support,
at least one core hole in an upper portion of said cone-shaped
member extending through the wall thickness of said cone-shaped
member between said rock crushing outer surface and said opposite
surface and located adjacent the upper end of said cone-shaped member,
and a connector arranged to be removably mounted in said core hole
to which a lifting line from powered machinery can be attached,
said core hole also serving as a filler opening for said backing
filler material with said connector removed from said cone-shaped
member.
3. A mantle for a rock crusher comprising:
a cone-shaped member having upper and lower ends and also having
a wall thickness with a pair of opposite surfaces one of which comprises
a rock crushing surface,
said cone-shaped member being removably mounted on a support in
said crusher,
at least one core hole in said cone-shaped member extending through
the wall thickness of said cone-shaped member between said opposite
surfaces and adjacent an upper portion thereof,
a connector arranged to be removably attached to said core hole
to which a lifting line from powered machinery can be attached,
said core hole having an enlarged portion in the surface thereof
opposite from said rock crushing surface,
and a nut removably fitted in said enlarged portion,
said nut being arranged to threadedly receive a lifting bolt as
said connector when said cone-shaped member is to be attached to
a lifting line.
4. The structure of claim 3 wherein said connector includes a bolt
in said core hole and a nut is removably fitted in said enlarged
portion against rotation, and a lifting bracket removably clamped
to said cone-shaped member by said bolt.
5. The structure of claim 3 wherein said nut being arranged to
receive a set screw plug therein when said lifting bolt is removed
from said nut.
6. The structure of claim 3 wherein said connector including means
removably engageable in said enlarged portion of said core hole
for removable attachment of said connector to said cone-shaped member.
7. The structure of claim 6 wherein said connector comprises a
bolt and a nut, said enlarged portion of said core hole removably
receiving one of said nut and the head of said bolt for connection
of the connector to said cone-shaped member.
8. The structure of claim 6 wherein said connector comprises a
hook and eye member said enlarged portion of said core hole removably
receiving said hook for connection of the connector to said cone-shaped
member.
Description BACKGROUND OF THE INVENTION
This invention relates to new and useful improvements in a lift
line connection for rock crusher components.
Manufacturers of rock crushers universally use manganese steel
and variations of it for the construction of wear mantles or jaw
plates. These components require replacement after a given amount
of service, or they require repair at times, and it is customary
in the trade to weld eyes to upper portions of these heavy parts
for handling by cranes or other powered machinery.
Manganese steel and variations of it are austenitic and require
welding rods made of stainless steel or welding rods made especially
for welding such steels. These types of steel cannot safely be welded
with the usual carbon steel welding rods since the latter are designed
to weld only mild steels. The special rods for welding manganese
steel and its variations are very expensive and workmen often substitute
carbon steel welding rods to save expenses, or the improper welding
rods are sometimes used because of ignorance of the workmen or simply
because of improper instructions or the failure to receive proper
instructions. When using the improper welding rods to weld the lifting
eyes onto the manganese rock crusher components, the weld-bonding
fusion area between the weld beads and the manganese steel is brittle
and cannot withstand an impact nor much tension and will break like
glass, thus possibly resulting in serious accidents.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a new and novel
lift line connection for rock crusher components that eliminates
the need of welding lifting eyes to them, and in particular provides
such a connection that has a portion thereof formed integrally in
the component for receiving a bolt or hook which insures a safe
lifting connection to a crane or other powered machinery.
For the purpose of achieving such objective, a mantle or jaw component
of a rock crusher is provided with one or more receptacle means,
preferably core holes, adjacent an upper edge thereof. Each core
hole is associated with a connector to which lifting line means
from a crane may be attached. In one embodiment of the invention,
each connector comprises a bolt and nut, and the core hole therefor
has an enlarged portion for receiving the nut or the head of the
bolt. The bolt clamps a lifting line bracket to the component. In
another embodiment, a hook and eye member is employed as the connector.
The hook portion of this member engages the enlarged portion of
the core hole and the eye portion is connectible to a lifting line.
On some types of crushers such as cone and gyratory, at least two
lift lines should be used for balanced lifting. The connectors are
removable from the component so as to be out of the way during crusher
use and for re-use of the connectors.
The invention will be better understood and additional objects
and advantages will become apparent from the following description
taken in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an elevational view, partially broken away, of a first
embodiment of the invention wherein the present lift line connection
is associated with a mantle component of a cone-type rock crusher.
FIG. 2 is an enlarged sectional detail view of the connection of
FIG. 1.
FIG. 3 is a fragmentary bottom plan view taken on the line 3--3
of FIG. 2.
FIG. 4 is a fragmentary elevational view taken on the line 4-4
of FIG. 2.
FIG. 5 is a view similar to FIG. 2 but showing a set screw retainer
in a non-lifting condition of the invention.
FIG. 6 is also a view taken similar to FIG. 2 but showing a second
embodiment of the invention.
FIG. 7 is a fragmentary plan view taken on the line 7--7 of FIG.
6 with the connector removed.
FIG. 8 is a face view of a jaw crusher component and showing a
connector embodiment similar to FIG. 1 as applied to this type of
crusher component, and
FIG. 9 is an enlarged sectional view taken on the line 9--9 of
FIG. 8.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
With reference to the drawings, the invention may be applied to
a cone or gyratory type crusher as shown in FIGS. 1-7 or a jaw type
crusher as shown in FIGS. 8 and 9. As noted above, its purpose is
to provide a connection for the safe lifting of wear mantles for
the cone or gyratory crushers or flat jaw plates for the jaw crushers
to avoid the dangers of using welded-on crane lifting eyes.
Cone or gyratory crushers have a cone-shaped head 10 FIGS. 1 and
2 that is operated in association with a bowl assembly, not shown,
for crushing rock between them. The head is protected by a mantle
12 of abrasion-resistant manganese steel of varying alloys all of
which are austenitic. Some attempts to use other steels or chilled
iron have proved to be inferior to manganese steel, such metals
being even more difficult to weld, if not impossible. These mantles
are very heavy and require on and off lifting by powered machinery
such as a crane. Mantles have the shape of a frustum of a cone with
a short cut-off segment at the top and terminating in a top edge
14. According to the embodiment of FIGS. 1-5 the mantle 12 is provided
with receptacle means in the form of core holes 16 spaced down a
short distance from the top edge 14 of the mantle. Preferable two
of such core holes are used in diametric relation but more or less
of such holes may be provided. Each core hole 16 terminates on the
inner surface of the mantle in a recess 18 for receiving a nut 20
of a bolt 22 capable of being removably mounted in the core hole
16. Preferably, the recesses 18 and nuts are square shaped for ease
of casting and for greater tolerances to self-lock. The bolt may
be positioned in inverted position from that shown, namely, the
head thereof could be located in the recess 18 and the nut exposed,
in which case the recess and bolt head will assume the same shape,
preferably square. In this latter structure the bolts are left in
the mantle because they cannot be extracted.
Bolts 22 are used to clamp lifting brackets 24 to the upper exterior
portion of the mantle. These brackets have suitable openings 26
for connection to lifting lines L, as shown in FIG. 1 operated
by powered lifting machinery. After the mantle is set in place,
the bolts 22 can be removed and the brackets 24 as well as the bolts
re-used. With the nuts of the bolts in the recesses, as shown in
FIG. 2 they can remain in place in a trapped position. If desired,
after the bolts have been removed, Allen set screw plugs 28 FIG.
5 can be installed in threaded engagement with the nuts. Allen
set screws for this purpose are of a type that have no head and
are of a length that when inserted, the heads thereof are substantially
flush with the outer surface of the nuts and the tip ends are in
engagement with the cone head. The screws will thus be protected
from wear and at the time of mantle change the core holes 16 can
be cleaned out for access to the Allen screws for removal, thus
locking the nuts in a fixed position.
A space usually exists in areas between the head and the mantle
in the upper areas thereof, and in conventional practice this space
is filled with a special epoxy or molten zinc 30. The backing filler
is inserted by conventional practice or through the core holes if
desired prior to installing the set screws and terminates short
of the core holes. The present lift line connection does not interfere
with this filled area.
The embodiment shown in FIGS. 6 and 7 comprises a lifting hook
32 that serves as a one-piece connector between the mantle and a
lifting line. The hook comprises an upper eye end 34 for attachment
to a lifting line and a lower hook end 36 that engages in receptacle
means in the form of a core hole 38 provided in spaced but close
association with the top of the mantle. A notch 40 extends from
the core hole 38 to the upper end of the mantle on the inner surface
of the mantle and is curved selectively similar to the curvature
of the hook end 36 to provide a positive and safe lifting connection
between these elements. This hook is readily removed by tipping
it inward as shown in dotted lines in FIG. 6 or if it cannot be
removed because it will not tip far enough, it can be cut off with
a torch.
The connection shown in FIGS. 8 and 9 is similar to t he embodiment
of FIGS. 1-4 but shows the bolt-type connector of the invention
as applied to a flat jaw plate 44 of a jaw crusher. According to
the invention the jaw plate has one or more core holes 46 adjacent
one or both of the upper and lower ends. As shown in FIG. 8 a single
lifting connection can be provided laterally in the center, although
if desired one on each side for a double lifting connection can
be provided. The core holes have a recess 48 for the nuts 50 of
bolts 52 installed in the core holes similar to the FIG. 1 embodiment.
The bolts 52 and brackets 54 are removable for re-use and provide
a positive and safe lifting connection to these heavy crusher parts
as opposed to questionable connector means in the form of eyes attached
by welding.
It is to be understood that the forms of our invention herein shown
and described are to be taken as preferred examples of the same
and that various changes in the shape, size and arrangement of parts
may be resorted to without departing from the spirit of our invention,
or the scope of the subjoined claims. |