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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 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