goovi® multiple vibrating screen - Influence of different motion types on the screening efficiency of difficult-to-screen materials

Peter Berlitz

goovi® multiple vibrating screenComparison of different screen types and related conceptions

+ Simple, proven and economic design

+ Less tendency for clogging of screen decks

+- Moderate efficiency of classification

Huge installation space

Capacity limited

Motion type pre-determined

Circular motion screen

+ Large capacities

+ High screening efficiency

High tendency for clogging of screen decks

High overall weight

Motion type pre-determined

Linear motion screen

Screening of all kind of bulk materials; Predominantly used in the mining industry

Screening of all kind of bulk materials; Predominantly used in the aggregates industry

goovi® multiple vibrating screenComparison of different screen types

+ Simple, proven and economic design

+ Less tendency for clogging of screen decks

+- Moderate efficiency of classification

Huge installation space

Capacity limited

Motion type pre-determined

Circular motion screen

High tendency for clogging of screen decks

High overall weight

Motion type pre-determined

Linear motion screen

Screening of all kind of bulk materials; Predominantly used in the mining industry

Screening of all kind of bulk materials; Predominantly used in the aggregates industry

+ Less tendency for clogging of screen decks depending on the motion type

+ Large capacities

+ Motion type and transport direction infinitely variable

Multiple motion screen

Screening of all kind of bulk materials; Suitable for various industries

Mining

AggregatesIndustrial minerals

A multiple vibrating screen can operate with circular, linear, elliptic or hybrid motion.

Adjustable parameters:Circular motion (rpm and amplitude)Linear motion (rpm, amplitude and throw angle)Elliptic motion (rpm, amplitude, throw angle, A/B ratio)

goovi® multiple vibrating screenMain components

Unbalance motors electronically synchronized

goovi® multiple vibrating screenWeight comparison

goovi® multiple vibrating screenReference installation

Application data

Feed Material: Blast furnace slag

Throughput: 180 - 270 tph

Feed Size: 0 - 45 mm

Product Size: 0 - 11 mm, 11-22, 22-45 mm

Screen type: Goovi® 1.8x6.0 Single Deck

Operation Mode

circular (predominant)linear, elliptic (occasionally, for wet material)

goovi® multiple vibrating screenExperimental setup

Fixed input parameters

Feed capacity

Feed size distribution

Moisture content of feed material

Mechanical properties of feed material

Ambient temperature

Operation Mode

Variable input parameters

Motion type

Circular motion

Linear motion

Rotational speed

850 1/min

900 1/min

Output variable

Percentage of undersize particles -11 mm in the product

goovi® multiple vibrating screenTest results

Motion type RPM

[1/min]

Moisture

content

Feed material

[%]

Percentage of

undersize

Particles in

product [%]

Circular 850 6.5 29.4

Circular 850 6.5 35.1

Linear 850 6.4 9.7

Linear 900 6.4 8.1

Linear 900 6.4 8.3

undersize

Particle size

The use of a multiple vibrating screen enabled testing of different screen motion types

with identical prerequisites.

goovi® multiple vibrating screenSummary of results and outlook

Results

Linear motion leads to higher screening efficiency than circular motion

Linear motion leads to more material clogging in the wire mesh than circular motion

The influence of the rotational speed is less compared to the influence of the motion type

Conceptions of motion type characteristics were confirmed

Outlook

Further studies with different feed materials to be carried out

Further studies on the influence of the linear vector’s angle to be carried out

Further studies with different types of elliptical motions to be carried out

Thank you for your attention!