Vibrating Screens

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Introduction to Osborn Screens

VIBRATING SCREEN SELECTION GUIDE

Osborn has the largest range of mining

screens available in the market. Osborn’s

experience in screen design and manufacture

goes back to the 1940’s. During this time

Osborn has continuously improved and

developed their screen range to suit all the

demanding conditions of the mining and

quarrying industries.

All vibrating screens are designed and

manufactured in South Africa at Osborn’s

modern facilities in Elandsfontein. Osborn

utilises the latest design technology combined

with FEA design analysis.

Screen typeNumber of Decks (std) Horizontal Inclined Comments Duty Range Drive Type

Osborn OBEX Horizontal and up

to 10° Incline or Decline

Single

Double

Y

Y

Y

Y

Sizing, washing and dewatering,

media recovery and scalping Light to Medium

Out of balance

Motors

Linear motion

Osborn Superking declined

Single

Double

Triple

4-deck

N

N

N

N

Y

Y

Y

Y

Aggregate Medium to Heavy

Single or Dual Shaft

and Vee belts

Circular Motion

Osborn Linear Horizontal and up to 5° Decline

Single Double Triple

Y Y Y

NNN

Sizing, Washing and Dewatering media recovery and scalping Medium to Heavy

Twin Shaft Overhead Drive Elliptical Motion

Osborn Exciter Driven Horizontal,

Inclined and Multislope

Multislope - 2 to 5 slopes

Single

Double Y

Y

Y

Y

Sizing, Washing and Dewatering

Screen, media recovery and

scalping

Medium to Extra Heavy

Exciter Driven

(Gearbox)

Linear Motion

Osborn Mogensen 3-5 Deck N Y Accurate Sizing Light duty

Out of Balance

Motors

Linear Motion

Osborn Vibrating Grizzly Single N YHD Vibrating Grizzly Screen

ScalpingHeavy to Extra Heavy

Exciter Driven

(Gearbox)

Linear Motion

“G” forces are very important in screen selection 5 G’s is considered the norm in South Africa. The bigger the screen aperture the higher the machine stroke.

Thus the speed will decrease. On fine apertures high speed with a small stroke is required. “G” force is calculated as stroke multiplied by speed.

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Osborn OBEX Screens

The Osborn OBEX screen was developed as a replacement for the older shaft

driven series. The main features are lower power consumption, low operating

noise and easy maintenance. OBEX screens can be used for conventional

screening, dewatering and washing applications.

Osborn’s OBEX screens are supplied with polyurethane screen panel decks as a

standard, but can be fitted with woven wire decks if required.

Two vibrating out of balance motors rotate in opposite directions, synchronising

and imparting a vibrating force in a longitudinal direction. This lifts the material and

carries it forward on each rotation providing a partical travel rate. The amplitude

can be varied by adjusting the out of balance weights on the vibrating motors to

the required stroke.

The frequency depends on the use of either 4 pole or 6 pole motors as dictated by the application. When dewatering on a 5° upslope, the use of a

variable speed drive VSD is recommended to achieve optimal speed and performance.

Screens can be installed up to 10° incline or decline

Width x Length Width x Length

All OBEX screens are available in Single and Double Deck configuration.

OBEX Screens can be powered by 4 pole or 6 pole motors in various Voltages.

All OBEX Screens operate with two out of balance motors.

Osborn can also design and manufacture specific sizes for specific applications.

1’ x 4’ (305 mm x 1220 mm) 5’ x 10’ (1525 mm x 3050 mm)

5’ x 12’ (1525 mm x 3660 mm)

2’ x 4’ (610 mm x 1220 mm) 5’ x 14’ (1525 mm x 4270 mm}

2’ x 6’ (610 mm x 1830 mm)

2’ x 8’ (610 mm x 2440 mm) 6’ x 12’ (1830 mm x 3660 mm)

6’ x 14’ (1830 mm x 4270 mm)

3’ x 5’ (915 mm x 1525 mm) 6’ x 16’ (1830 mm x 4880 mm)

3’ x 6’ (915 mm x 1830 mm) 6’ x 18’ (1830 mm x 5490 mm)

3’ x 8’ (915 mm x 2440 mm)

3’ x 10’ (915 mm x 3050 mm) 7’ x 14’ (2135 mm x 4270 mm)

7’ x 16’ (2135 mm x 4880 mm)

4’ x 8’ (1220 mm x 2440 mm)

4’ x 10’ (1220 mm x 3050 mm) 8’ x 16’ (2440 mm x 4880 mm)

4’ x 12’ (1220 mm x 3660 mm)

Screen typeNumber of Decks (std) Horizontal Inclined Comments Duty Range Drive Type

Osborn OBEX Horizontal and up

to 10° Incline or Decline

Single

Double

Y

Y

Y

Y

Sizing, washing and dewatering,

media recovery and scalping Light to Medium

Out of balance

Motors

Linear motion

Osborn Superking declined

Single

Double

Triple

4-deck

N

N

N

N

Y

Y

Y

Y

Aggregate Medium to Heavy

Single or Dual Shaft

and Vee belts

Circular Motion

Osborn Linear Horizontal and up to 5° Decline

Single Double Triple

Y Y Y

NNN

Sizing, Washing and Dewatering media recovery and scalping Medium to Heavy

Twin Shaft Overhead Drive Elliptical Motion

Osborn Exciter Driven Horizontal,

Inclined and Multislope

Multislope - 2 to 5 slopes

Single

Double Y

Y

Y

Y

Sizing, Washing and Dewatering

Screen, media recovery and

scalping

Medium to Extra Heavy

Exciter Driven

(Gearbox)

Linear Motion

Osborn Mogensen 3-5 Deck N Y Accurate Sizing Light duty

Out of Balance

Motors

Linear Motion

Osborn Vibrating Grizzly Single N YHD Vibrating Grizzly Screen

ScalpingHeavy to Extra Heavy

Exciter Driven

(Gearbox)

Linear Motion

“G” forces are very important in screen selection 5 G’s is considered the norm in South Africa. The bigger the screen aperture the higher the machine stroke.

Thus the speed will decrease. On fine apertures high speed with a small stroke is required. “G” force is calculated as stroke multiplied by speed.

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Osborn SUPERKING Screen

The Osborn SUPERKING screens are frequently used in primary screening and scalping operations and have proved to be exceptionally reliable in the mining and quarrying industries. Generally operating at 16° to 20° installation angle, the SUPERKING produces a maximum of 12 mm stroke at around 5G’s.

The SUPERKING has fully adjustable counterweights for optimum screening and efficiency.

Available in single, double, triple or 4 deck configurations, these screens are equally efficient for screening dry or wet gravel, sand, crushed stone and all types of ore.

The drive is a self contained vibrator unit complete with a heavy duty steel shaft and fitted with grease lubricated self aligning spherical roller bearings. The unit is completely enclosed and dust tight.

To ensure that the feed material spreads across the full width of the screen deck, the SUPERKING screens are fitted with screen feed boxes as standard.

The Osborn SUPERKING screens are supplied with woven wire screen decks as a standard but can be fitted with polyurethane screen panels if required.

Width x Length Width x Length

SINGLE DECK TRIPLE DECK

3’ x 10’ (915 mm x 3050) 4’ x 10’ (1220 mm x 3050 mm)

4’ x 10’ (1220 mm x 3050 mm) 5’ x 10’ (1525 mm x 3050 mm)

5’ x 10’ (1525 mm x 3050 mm) 5’ x 12’ (1525 mm x 3660 mm)

5’ x 12’ (1525 mm x 3660 mm) 5’ x 14’ (1525 mm x 4270 mm)

5’ x 14’ (1525 mm x 4270 mm) 5’ x 16’ (1525 mm x 4880 mm)

5’ x 16’ (1525 mm x 4880 mm) 6’ x 16’ (1830 mm x 4880 mm)

6’ x 16’ (1830 mm x 4880 mm) 6’ x 20’ (1830 mm x 6100 mm)

6’ x 20’ (1830 mm x 6100 mm) 7’ x 20’ (2135 mm x 6100 mm)

7’ x 20’ (2135 mm x 6100 mm) 7’ x 20’ (2135 mm x 6100 mm) Dual Drive

8’ x 20’ (2440 mm x 6100 mm) 8’ x 20’ (2440mm x 6100 mm) Dual Drive

8’ x 22’ (2440 mm x 6710 mm) 8’ x 22’ (2440mm x 6710 mm) Dual Drive

DOUBLE DECK FOUR DECK

5’ x 10’ (1525 mm x 3050 mm) 6’ x 16’ (1830 mm x 4880 mm)

5’ x 12’ (1525 mm x 3660 mm)

5’ x 14’ (1525 mm x 4270 mm)

5’ x 16’ (1525 mm x 4880 mm)

6’ x 16’ (1830 mm x 4880 mm)

6’ x 20’ (1830 mm x 6100 mm)

7’ x 20’ (2135 mm x 6100 mm)

7’ x 20’ (2135 mm x 6100 mm) Dual Drive

7’ x 20’ (2135 mm x 6100 mm) Heavy Duty

8’ x 20’ (2440 mm x 6100 mm)

8’ x 20’ (2440 mm x 6100 mm) Dual Drive

8’ x 24’ (2440 mm x 7320 mm) Dual Drive

8’ x 29’ (2440 mm x 8845 mm) Dual Drive

NOTESFor sizes not listed here please consult Osborn. Where dual (2 drives) are shown it indicates a twin drive mechanism timed by a toothed belt for heavy duty applications.

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Osborn Exciter Driven Screens

This linear motion screen is generally regarded as a high speed,

high volume screen, superior in screening efficiency and capacity

versus the more conventional horizontal and declined models. It

is available in single deck & double deck configuration.

The unbalanced Exciter Drive, designed and manufactured in

SA, consists of a sturdy soundproof housing which contains two

shafts that are synchronised with gears and mounted in heavy

duty roller bearings. Lubrication of the bearings and gears is

achieved by a combination of an oil bath and an oil mist.

Eccentric weights are attached to both ends of the shaft. While

stationary, the unbalanced mass can be changed by adding or

removing weights. This alters the strength of the unbalanced

exciter drive force and the oscillation amplitude of the vibratory

equipment.

The Multi Slope Type Screen with the Exciter Drive is made up

of two, three or five decks that are installed at different angles.

The Exciter Drive gearbox is mounted over the top of the screen

which imparts a straight linear motion through the screen

arrangement.

Used extensively in the coal and diamond processing industry,

the Osborn Multi Slope Type Screen has the capability of handling

wet and sticky materials. This is due to the aperature sizes

changing over the full screen length by virtue of the different deck

angles and particle approach angles.

OSBORN EXCITER DRIVEN SCREENS

Width x Length

8’ x 18’ (2440 mm x 5490 mm)

10’ x 18’ (3050 mm x 5490 mm)

10’ x 20’ (3050 mm x 6100 mm)

10’ x 22’ (3050 mm x 6710 mm)

12’ x 24’ (3660 mm x 7320 mm)

12’ x 26’ (3660 mm x 7930 mm)

12’ x 30’ (3660 mm x 9150 mm)

These screens can be installed up to an angle of 20°

OSBORN EXCITER DRIVEN MULTI SLOPE TYPE SCREENS

Width x Length

8’ x 18’ (2440 mm x 5490 mm)

10’ x 18’ (3050 mm x 5490 mm)

10’ x 22’ (3050 mm x 6710 mm)

12’ x 24’ (3660 mm x 7320 mm)

12’ x 26’ (3660 mm x 7930 mm)

12’ x 30’ (3660 mm x 9150 mm)

Osborn Exciter Driven Multi Slope screens can be built with deck configurations in 2, 3 and 5 slopes.

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Osborn Linear Screens

Width x Length Width x Length

SINGLE DECK TRIPLE DECK

5’ x 12’ (1525 mm x 3660 mm) 5’ x 12’ (1525 mm x 3660 mm)

5’ x 14’ (1525 mm x 4270 mm) 5’ x 14’ (1525 mm x 4270 mm)

5’ x 16’ (1525 mm x 4880 mm) 5’ x 16’ (1525 mm x 4880 mm)

6’ x 16’ (1830 mm x 4880 mm) 6’ x 16’ (1830 mm x 4880 mm)

7’ x 20’ (2135 mm x 6100 mm) 7’ x 20’ (2135 mm x 6100 mm)

8’ x 20’ (2440 mm x 6100 mm)

8’ x 24’ (2440 mm x 7320 mm)

DOUBLE DECK

5’ x 10’ (1525 mm x 3050 mm)

5’ x 12’ (1525 mm x 3660 mm)

5’ x 14’ (1525 mm x 4270 mm)

6’ x 16’ (1525 mm x 4880 mm)

7’ x 20’ (2135 mm x 6100 mm)

8’ x 20’ (2440 mm x 6100 mm)

8’ x 24’ (2440 mm x 7320 mm)

NOTEPlease consult Osborn for other sizes

Where accurate and efficient screening is required, the Osborn Linear

Screen is generally the equipment of choice. Capable of screening large

capacities of material, this medium to heavy duty screen operates with

an elliptical throw but still produces a maximum force of 5 G’s.

Operating with a three way motion (horizontal, vertical and elliptical),

this unique movement quickly stratifies and turns materials so that all

sides of each particle are exposed to deck openings and where fitted,

water spray nozzles. The result is more complete screening, accurate

sizing and more thorough dewatering. The heart of the Osborn Linear

Screen is the Vibrator mechanism.

Twin shafts, driven through wide face helical gears, are completely

enclosed in a dust proof housing which contains a large oil reservoir to

provide splash lubrication to the gears and bearings. The oil assists in

dissipating heat and lowers bearing temperatures for longer bearing

service life.

The single shaft extension vibrator can be turned end for end (and

gears retimed) to change the hand orientation of the drive, because

the short vibrator side plates are symmetrical. Therefore, one vibrator

for left hand and right hand drive.

VIBRATING SHAFTSEach tough, eccentric, vibrator shaft is precision-machined from

1045 steel for extra-long service.

OIL FLINGER

WIDE-FACE HELICAL GEARSTiming gears are premium-quality, single helical design, precision-cut from 4140 heat-treated steel. Wide-faced gear teeth distribute load much more effectively than spur gears, and promote smooth, quiet, long-lived operation under heavy loading.

OIL-SPLASH LUBRICATIONThrough-flow, oil splash system provides superior lubrication of gears and bearings. Large oil reservoir, extending the entire length of vibrator housing, dissipates heat rapidly, and lowers bearing temperatures for longer bearing service life.

DOUBLE-LIP SEALRetains oil and prevents contaminants from

entering vibrator mechanism. Seals and seal sleeve are easily replaceable when worn.

Osborn Spreader Feeder

TRANSVERSE FEEDERThe transverse feeder is available in four sizes being suitable for

feeding the 1.0, 1.5, 2.0 and 3 meter wide sizers and screens. They

are suitable for accepting a feed and turning through 90 degrees

into a steady and continuous flow across the width of the screen

feed plate. Occasionally they can be supplied to feed two machines

mounted in parallel.

CENTRAL FEEDER The central feeder again is available in four sizes suitable for feeding

the 1.0, 1.5, 2.0 and 3 meter wide sizers and screens. They accept

a central feed and spread the material sideways in two directions

across the width of the screen feed plate.

Designed to accept a fast material flow from a relatively narrow feed and convert this into a low velocity and uniform flow across the width of the machine. The Osborn Spreader Feeder is highly recommended for this process.

These feeders are capable of handling a wide range of products including materials such as damp clay and limestone; and are ruggedly built for arduous trouble free service. There are two types of Osborn spreader feeders. These are:

Osborn Mogensen Sizer®

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The Osborn Mogensen Sizer® is made up of several screening decks which are arranged on top of one another and have different inclinations.

The meshes are bigger in the upper decks and smaller in the lower decks. The maintenance-friendly screen mesh is excited in a compact case

by out of balance motor vibrators. While the finer particles of the material fall through the larger meshes of the upper deck almost vertically,

the larger particles are filtered out of the material flow. Due to the different inclinations of the screen media, their openings have the effect of

a smaller aperture. For this reason, the mesh widths can be unusually large compared to conventional flat-screens at the same separation

efficiency. The separation of different particle sizes from the material

flow and the larger mesh width not only prevent the deposition of

material layers and clogging of material on the screen surface, but

also ensure a high throughput. The sizer is fully dust enclosed with a

sealed outlet and inlet.

MOGENSEN SCREEN SIZES

Models Width No. of Decks Motor

055 1.6 ‘ (500 mm) 5 2 Pole

103 3.2 ‘ (1000 mm) 3 4 Pole

105 3.2 ‘ (1000 mm) 5 4 Pole

155 5 ‘ (15000 mm) 5 6 Pole

203 6.5 ‘ (2000 mm) 3 4/6 Pole

205 6.5 ‘ (2000 mm) 5 4/6 Pole

Application Data Customer Contact Person

Tel No. Email

Cell No. Date Enq.No:

TYPE OF MATERIAL MAX FEED SIZE (mm)

DRY BULK DENSITY t/m³ CAPACITY tph

MOISTURE CONTENT % FLOWABILITY Good Fair Poor

APPLICATION Light Duty Medium Duty Heavy Duty X-Heavy

PARTICLE DISTRIBUTION Particle % Passing

DECK PREPARATION Deck Cut Size Poly Wire Rubber

Top

Second

Third

Fourth

If wet screening, how much water is available and at what pressure?

HOW IS THE SCREEN BEING FED? YES NO

Conveyor

Vibrating Feeder

Is the material feed constant ?

Feedbox

Companies of the Astec Aggregate and Mining Group

www.osborn.co.za www.telsmith.com www.rockbreaker.com www.astrcmobilescreens.com www.kpijci.com

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Head Office:57 Jansen Road, Elandsfontein

PO Box 8182Elandsfontein,1406JohannesburgSouth Africa

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.

Tel: +27 11 820 7600 Fax: +27 11 388 1136Call Centre: 0861 OSBORNE-mail: osborn@osborn.co.za

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