ABRASIVE RESISTANT MEMBERS

ELEMENTS RESISTANT A L'ABRASION

English Abstract

ABSTRACT
An abrasive resistant unit comprising a
plurality of white cast iron plates embedded in
and vulcanized to rubber which in turn is vulcanized
to a mild steel backing plate.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. An abrasion resistant unit, said unit being characterized
by at least one abrasion resistant white cast iron plate, a non-
abrasion resistant backing plate, mechanical means on the backing
plate to attach the unit to a supporting structure, said cast
iron plate having an exposed wear-resistant upper surface and
one lower face surface, said white cast iron plate being
vulcanized to a mass of rubber that is vulcanized to said backing
plate, all of such lower face surface of said iron plate being
bonded by vulcanization to said mass of rubber, which rubber
assists in acoustically isolating said white cast iron plate from
said backing plate while supporting said white cast iron plate
in the event of breakage.
2. An abrasion resistant unit as defined in Claim 1, character-
ized in that said abrasion resistant unit comprises a plurality
of white cast iron plates spaced from each other by vulcanized
rubber, said unit being produced by being cut from a larger unit
by sawing between adjacent white cast iron plates, said cast
iron plates all having exposed wear-resistant upper surfaces.
3. An abrasion resistant unit as defined in Claim 2 character-
ized in that said white cast iron plates have vertical sides,
said abrasion resistant unit initially comprises a plurality of
white cast iron plates spaced from each other by vulcanized
rubber and forming a larger initial unit, said first named unit
being produced by being cut from (a) said larger unit by cuts
made between adjacent white cast iron plates, said mass of
rubber being simultaneously vulcanized to said white cast iron
plates and to said backing plate, each said white cast iron


plates also being bonded to said mass of rubber on said vertical
sides.
4. An abrasion resistant unit as in Claim 3, characterized
by said rubber being present between adjacent vertical sides of
said white cast iron plates in sufficient width to remain bonded
to said sides after being cut from said larger initial unit.

Description

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-' This invention relates to improvements in and
. relating to abrasive resistant members, more
particularly members in which abrasive materials
' pass over along a surface.

,- 5 BACKGROUND OF THE INVENTION
~'- While the invention can be applicable to various
abrasive situations, one form will be described i,n
relation to its use on reci,procatory feeder decks,
,~ chute liners and -the like. In the design of
reciprocatory feeders, and the deckings and liners
:~ therefore, the decking and liners must be highly
, resistant to the abrasive material being fed, but on
the other hand the units must be as light as possible


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to minimise the inertia, and thus to be able to
design the feeders to operate in a satisfactory
manner.

Thus these reciprocatory feeders must have
S linings or surfaces thereon which are highly resistant
~ to abrasion, and be light in weight. It is well
;;; known that white cast lron is highly resistant to
~ abrasion, but it has the disadvantages that it is
: very brittle and fragile and problems arise in
mounting such plates of white iron in situations
~ such as this.

: For example if the plates are bolted in position, then due to the abrasive nature of the use, the
bolts could quickly wear away and the plates would
become loose and either be completely removed or
readily fracture.

Other forms of abrasive resistant materials are
known, and these include highly resistant abrasive
~;~ welding, which can be welded on to a plate, but this
-~ 20 thickness is limited to approximately 5/16 of an inch
~` on for example a ~ inch plate.
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~ However such materials are very expensive to
;~ produce, and also due to the limited thickness which
can be applied by this welding technique, are not
:; 25 entircly satisfac-tory.
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~ Thus it is realised that white cast iron plates
;;i~ could be an ideal form of abrasion resistant lining
~ and the like, if some means could be devised for
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mounting these plates and securing them in position, without
producing an unduly heavy structure. It is to be realized
that it is virtually impossible to weld white cast iron due
to the ready tendency of such cast iron to crack and fracture
due to the internal stresses produced during and after the
welding operation.
BRIEF DESCRIPTION OF THE_INVENTION
` Thus it is an object of this invention to provide anabrasion resistant liner or plate or the like, such liner or
plate having high abrasive resistance and yet being relatively
light in weight.
- According to the invention there is therefore provided an
abrasion resistant unit, said unit being characterized by at
least one abrasion resistant white cast iron plate; a non-
abrasion resistant backing plate, mechanical means on the
backing plate to attach the unit to a supporting structure, said
cast iron plate having an exposed wear-resistant upper surface
and one lower face surface, said white cast iron plate being
vulcanized to a mass of rubber that is vulcanized to said
backing plate, all of such lower face surface of said iron plate
being bonded by vulcanization to said mass of rubber, which
rubber assists in acoustically isolating said white cast iron
plate from said backing plate while supporting said white cast
iron plate in the event of breakage.
BRIEF DESCRIPTION OF THE DRAWINGS
- In the drawings FIG. 1 shows one form of the invention.

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DESCRIPTION OF THE PREFERRED EMBODIMENT
As shown in the single figure of the drawings, the white
cast iron plates 1 can be bonded to rubber 2 by vulcaniæation,
with the upper surface 3 of the plates being the upper wearing
surface of the abrasion resistant unit the white cast iron
. plates being bonded across their lower surface 4 and along
their vertical sides S to the mass ~f r~bber 2.




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In this way the white cast iron plates 1 arefirmly supported in position with the rubber 2 and
white cast iron plates 1 being mounted on a backing
plate 6. This backing plate can be a relatively thin
material such as mild steel as long as it is sufficient
to mount the assembly in desired position.

This mounting can be either by welding, rivetting,
bolting or other provisions such as studs 7 or the
like welded to the backing plate.
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The unit is produced by positioning the white
cast iron plates and the backing plate in position
and the unit formed by vulcanizing the rubber to bond
the white cast iron plates to the backing plate to
form the unit.

In this way the size and thickness of the white
cast iron plates 1 can be readily chosen as desired,
and also the dimensions of the plates themselves
and the spacing therebetween can be chosen as desired.
In this way it is possible to produce large plates,
and these can easily then be cut by a normal metal
band saw, by cutting in between the plates of white
iron. For example the white cast iron plates can be
8 inches square and ~ inch thick. The rubber could
be 3/8 inches thick and are bonded to a 3/16 inch
backing plate.

The unit thus produced is of relative light
weight, there is economy of production of the units,
and the units produce a high life resistance to
abrasion.

ilence it is realized that the invention provides

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a very versatile plate, in that the units can be
made of any desired dimension, the white cast iron
plates can be of any suitable dimension and thickness,
the rubber thickness which supports the plates can
be varied as desired, and also the backing plate
; can be formed to suit the desired situation. While
the white cast iron plates can be of any suitable
dimension, in practice they are limited to about
8 inches square, for above thi.s dimension with a
J 10 ~ inch thick plate, it is difficult to cast a plate
with a relatively flat upper surface.
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Also while particular. reference has been made
: to white cast iron plates, it is to be realized
that the abrasive resistant plates could be of other
metals, such as manganese steel. Also the backing
. plate could be of a metal other than mild steel,
: such as iron~
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~ While rubber is a preferxed material, this can
: be either natural or synthetic rubber, or a combination
thereof, or any other suitable elastomeric material,
and bonded to the plates by vulcanization of by use
of a suitable adhesive.
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While various forms of the invention have been
described, it is realized that the invention is not
to be limited thereto but can include various modi-
fications falling within tho spirit and scope of the
inventioll .

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