Rotary Breakers

Introduction to Osborn Coal Crushers

The preparation of ROM coal commences the moment it is received from the mine. The Rotary Coal Breaker crushes and breaks the coal and removes the majority of the rock contamination.

The sized coal from the Rotary Breaker can then be fed into a Rolling Ring Crusher which produces a finer product.

For more specific and smaller sizing of the coal, the Double Roll Crusher is generally the preferred machine, particularly for processing the sizes required by power stations and for the export market where tight specifications are required.

Serving the South African coal market for more than 80 years, Osborn’s Coal Crushers have proven to be extremely reliable and have gained popularity as far afield as Australia, Turkey and neighbouring African countries, such as Zambia, Zimbabwe, Botswana and Mozambique.

Osborn Rotary Breakers

The Rotary Breaker works on a gravity method to break coal in a very efficient manner through attrition. Material is continuously

introduced at the feed end, repeatedly raised by the lifters and dropped until it is broken to size and falls through the perforations in

the screen plates to a collection hopper below.

Any hard rock present in the feed material assists with breaking the coal during the raising and dropping action. The Osborn Rotary

Breaker is designed to reduce soft to medium coal and is not entirely suitable for hard coal or coal with a high moisture content. Mine

rock, refuse and other uncrushable debris is automatically carried to the end of the drum and is discharged through a chute. The

Rotary Breaker design incorporates a chain and sprocket drive arrangement which drives a heavy duty reinforced drum. Renewable

perforated plates are fitted around the interior of the drum. Interchangeable lifters and ploughs are bolted on the inside of the drum.

Due to variations in the types of coal being processed; capacities and power requirements will vary from Mine to Mine.

Osborn Rotary Breakers are capable of processing up to 2 000 tph with a maximum feed size of 600 mm depending on the type

of coal being processed. Generally, the machine is fitted with perforated plates

to continuously produce one product size. Should the product size need

to be changed, new sized perforated plates would have to be fitted.

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3

ITEM DESCRIPTION DRUM LENGTH- A (mm)

CANOPY HEIGHT- B (mm)

CENTRE HEIGHT- C (mm)

TRUNNION CENTRES - D

(mm)

INLET DIAMETER - J (mm)

1 3.0 X 6.7 8330 3970 1950 860 1500

2 3.6 X 5.6 7770 4582 2090 1028 1800

3 3.6 X 6.7 9040 4582 2090 1028 1800

4 3.6 X 7.6 9910 4582 2090 1028 1800

5 4.2 X 6.7 9310 5170 2550 1017.5 2100

6 4.2 x 9.0 11400 5170 2550 1017.5 2100

Fabricated or cast screen plates are manufactured from wear resistant materials. The coal lumps are lifted and dropped onto the screen plates minimising the amount of fines passing through the square apertures. The drum is fitted with lateral beams for stiffness and square aperture screen plates with hole sizes to suit the product required.

Thrust Rollers are positioned at each end of the Rotary Breaker to prevent excessive axial float. Osborn Rotary Breakers can accept feed size of 600 mm of coal and high capacity units process up to 2000 tph. Osborn Rotary Coal Breakers have a simplistic design but are extremely durable. For this reason coal miners choose the Osborn Rotary Coal Breaker.

Replaceable steel al loy tyres are shrunk onto the machined end disc to ensure easy maintenance.

Uncrushable objects in the feed are passed through an outlet scoop into a collecting bin.

A segmented drive sprocket bolted to the machined end disc.

Special wide faced trunnion rollers support the breaker drum. Rollers are housed in self-aligning spherical roller bearings.

Chain Drive or Girth Gear and Pinion Drive

All rights reserved. Unless otherwise indicated, all materials on these pages are copyrighted by OSBORN. No part of these pages, either text or image may be used for any purpose other than personal use. Therefore, reproduction, modification, storage in a retrieval system or retransmission, in any form or by any means, electronic,

mechanical or otherwise, for reasons other than personal use, is strictly prohibited without prior written permission.

Head Office:57 Jansen Road, Elandsfontein

PO Box 8182Elandsfontein, 1406

JohannesburgSouth Africa

Tel: +27 11 820 7600 Fax: +27 11 388 1136

Call Centre: 0861 OSBORN

E-mail: osborn@osborn.co.za www.osborn.co.za

Companies of the Astec Aggregate and Mining Group

www.osborn.co.za www.telsmith.com www.rockbreaker.com www.kpijci.comwww.astecmobilescreens.com

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