AU675987B2 - Inserts for mineral breakers - Google Patents

Description

AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

ORIGINAL

NAME OF APPLICANT: ACTUAL INVENTOR: HAROLD ALBERT COLLINS HAROLD ALBERT COLLINS

S..

ADDRESS FOR SERVICE: Oberins Level 32 Melbourne 530 Collins Street Victoria Australia 3000 0 o TITLE: INSERTS FOR MINERAL BREAKERS The following statement is a full description of this invention including the best method performing it known to me.

I '1 FIELD OF TIHE INVENTION This invention relates to inserts for mineral breakers and in particular to the combination of holder and inserts.

BACKGROUND

Machinery for the breaking down of' mineral ores in mining and other excavatory operations forms an important part of the overall process. Rotary mineral breakers are well known and typically comprise a structure similar to that illustrated in Figures A and B annexed hereaftcr.

Figure A is a sectional plan view of the TIDCO BARMAC crusher which includes a distributor plate as shown which directs the ore feed to a zone marked 50 which comprises compacted ore which has built up against holders 52 having tungsten carbide inserts 54. This zone 50 serves as an autogenous liner in tile rotor from which the particles are thrown in the direction of arrows at great velocity against a solid pack rock shelf 56 of Sthe peripheral crushing chamber 58 (Figure At the same time further ore particles are 15 introduced as a cascading feed 60 so that particles impact against the rock shelf 56 and against the cascading particles and particles bouncing off the shelf 56 in the direction of tile arrows. This action is repeated thousands of times per second to give a fine product.

The tungsten carbide inserts 54 as well as the holders 52 are subject to substantial wear and it is in this area that development has been cuncentrated. The difficulty involves 20 finding a suitable holder in which replaceable carbide inserts may be embedded. A holder/ insert which will last longer and which is more easily replaceable would reduce downtime and increase machine availability.

S. Such an advantage has been achieved, for example in the Tidco Barmac crusher as illustrated, by bolting or welding a plate carrying a hardened secondary insert behind thel main holder as shown at 54. In this way, the main insert is used to contact the mineral and when it fails the plate may be eroded by the material until the secondary insert is available to contact the mineral. However, once this secondary insert/holder fails the complete holder and insert may have to be replaced.

It is therefore an object of the present invention to provide an arrangement which avoids these difficulties and which is less expensive to produce, and easier to refit.

It will be appreciated that existing equipment may be converted or adapted to receive the holders of the present invention.

THE INVENTION According to the invention there is provided a holder for use in the rotor of a mineral breaker, the rotor having top and bottom plates, the holder including two or more RA recesses for hardened inserts arranged to be disposed at radially different distances when used in the rotor, the outermost insert extending beyond a radial line drawn to a forward

I

edge of the other iserts and extending at aII obtuse angle to thle flow (If mlineral and beinig conmtaahe by thc mineral.

2 0 In a preferred form of the invention the holder has recesses at angles away from the flow of mineral and being adapted to accommodate the hardened inserts.

Each insert may comprise two or more hardened units, at least one of which is of a high abrasive resistant material and the other or others of a high impact resistant material. The hardened units may be arranged in the vertical or horizontal plane, in any order.

.10 However, it will be understood that the second and successive inserts may be of either high impact or high abrasion resistance (or a combination as described in the previous paragraph) depending on the mineral being broken.

In the event of the first insert failing, the portion of the holder 15 carrying it will be rapidly worn away and the second insert will be exposed to the passage of the mineral. Once the second and third and o any subsequent inserts have failed, the holder can be removed and replaced with a new single piece thereby avoiding any machining.

In a preferred form of the invention the top and bottom plates of the rotor have sockets of complemental shape to the cross section of the holder. When necessary to change the holder it is merely removed and a new one located in position.

EMBODIMENTS OF THE INVENTION Two embodiments of the invention are described below with reference to the accompanying drawings.

Figures 1 and 2 of which arc sectional side views of holders according to the invention; and Figure 3 is a diagrammatic representation of a rotor including the holders of the invention.

In Figure 1 the holder 10 includes a pair of recesses 12, 14 at angles away from the flow of mineral. The outermost recess 14 is adapted to receive a large insert 18 with a large zone 20 thereof in direct contact with the mineral and serving to retain the mineral, to help protect itself from wear. A subsidiary insert 22 is located in recess 12.

In Figure 2 a different arrangement is shown with a different arrangement of subsidiary inserts 24, 26 as compared with that of the insert 22 of Figure 1.

In Figure 3, which is diagrammatic, a holder 10 of the invention is located in 15 place simply by dropping it into sockets 70, 72 in the top and bottom plates of the rotor 74, the sockets being of complemental shape to the narrow portion 76 of the holder.

S. Plates 78 alternate with the holders It will be appreciated that existing equipment may be eanverted or adaptedto-- -rc.i. the, holders of the prccnll t invention.

Claims (4)

1. A combination of a holder and hardened inserts, for use in the rotor of a mineral breaker, the rotor having top and bottom plates, the holder including two or more recesses for the inserts arranged to be disposed at radially different distances from the rotor when used in the rctor, the insert furthest from the rotor being located beyond the radial line drawn to a forward edge of the next furthest insert and extending at an obtuse angle to the flow of mineral, all of the inserts being eontactable by the mineral

2. The holder according to claim 1 in which the recesses extend at obtuse angles to the 10 flow of mineral.

3. The holder according to either of the preceding claims in which each insert comprises two or more hardened units at least one of which is of a high abrasive resistant material and the other or others of a high impact resistant material. 5

4. The holder for a mineral breaker substantially as described with reference to 15 Figure 1 or Figure 2 of the accompanying drawings. DATED this 30th Day of December 1996 OBERINS Patent Attorneys for HAROLD ALBERT COLLINS ABSTRACT A mineral breaker has sockets in the top and bottom plates which receive holders of complemental shape, the holders having two or more recesses in line, each recess being at an angle away from the flow of mineral and each recess being adapted to receive hardened inserts, the outermost insert being above the line of the other insert/s and being directly contactable by the mineral. o 6* *0 C