The success of screening is determined by the quality of the product obtained, i.e. the proportion of undersized/oversized particles in the various grades.
It is evident that best result cannot be achieved cost effectively, with just one type of screening for all applications. The requirements are too demanding and materials too numerous.
It is therefore advisable to refer your problem to a specialised screening machine manufacturer who not only has an extensive range of machines in his delivery programme but has qualified staff with experience in your particular field.
Table 1 explains the technical differences between circular and linear motion screening machines – the main groups in the range of modern screening machine manufacturers
|Types of machine||Circular motion screening machine||Double counter
|effective screening width||mm||400-2400||600-5500|
|effective screening length||mm||800-6000||1900-11000|
|screening area||m2||0, 3-14, 4||1, 2-50|
|amplitude||mm||2- 6||3- 8|
|angle of throw||degree||75-85||35-60|
|screening angle, normal||degree||10-22||0-12|
|screening angle, special execution||degree||8-40||Upto 40|
|transport speed, normal||m/s||0, 12-0, 3||0, 2-4, 4|
|transport speed, special execution||m/s||Upto 4, 0||Upto 4, 0|
Modern screening plants are judged by the quality of material produced, throughput for a given screening area, availability, power consumption and personnel required, in other words, the overall economy.
There is an ever increasing demand for higher throughputs,calls for larger machines, not least because they are more economical. Having recognised this trend, we developed and manufactured “large screening machines”, for preparation plants with high capacities.
At the same time, our wide range of screening machines for small and medium capacities are also being developed using latest technology. We build and supply specialised screening machines for pre-screening, underwater screening and sand-screening. They can be mobile, stationary with dust covers, or for classifying.
|Types of machine||Material Characteristics||Circular motion screeningmachine||Double counterweight
|Classification||Coarse with sprays||•||•|
|Classification||Fine with sprays||•||•|
|When compiling this table, both commercial and technical aspects were considered.Legend
☐ recommended with reservation
O not recommended
Circular Motion Screens
- Sand and gravel, building materials
- Rocks, crushed stone, chippings
- Minerals, ores, pellets, sinter
- Coal, coke, petrol coke
- Chemical products, fertilisers, granular material
- Salts, sugar
- Compost, refuse, refuse slags
Circular motion screens are freely vibrating. This means that the amplitude is self regulating depending on the relationship between the weight of the screen itself and the counterweight. Circular motion machines have a steep angle of throw and therefore require an inclination of 10º- 22º.
Exceptions are the dewatering screen at 3º-5º and steep screens, for example when screening sand at an angle 20º- 40º.
The screen frame, consisting of side plates and cross-members,absorbs all static and dynamic forces. The drive shaft with eccentrics runs in 2 roller bearings that are positioned at the centre of gravity. Drive is either via V-belts or flexible coupling. Lubrication of the bearings is either by oil or grease. The screen frame with 4 sets of springs rests on the support construction and can be manufactured to accept lengthwise or crosswise tensioned sieves as well as flat panels. For dusty materials we supply the machines with either a dust hood or a complete dust enclosure.
|Technical data for Circular motion screens|
|Angle of throw||degree||from||75||upto||85|
|We reserve the right to make changes that serve technical progress.|
Double Counterweight Screens
Coal, raw and washed
Ores, minerals, granular material
Coal, coke, petrol coke
Sand and kies, baustoffe
“Banana” screens are high speed screening machines. Due to the steep screen inclination, high transport speeds are achieved. A very thin layer is formed and a large proportion of the fines pass through the elongated apertures. The inclination is less in the middle and discharge section, which reduces the transport speed. In these sections a good separation, even of marginal particles, is achieved.
|Angle of throw||degree||from||35||upto||60|
|We reserve the right to make changes which serve technical progress|
For more than five decades, we have maintained leadership with proven technology, consistent quality, committed delivery and effective customer service in the field of crushing screening, material handling, grinding, beneficiation and pyroprocessing.
As pioneers in the turnkey execution of mining and processing plants, viz coal, iron ore, steel, aluminium, cement, fertilizers, power generation and minerals, we harnessed a dedicated team of professionals and built a fully equipped workshop to provide innovative technology and cost-economical equipment for all
A growing list of satisfied customers is a testimony to this.