Prescreening

Prescreening increases productivity

Generously dimensioned and extremely robust

The less fine material that reaches the crushing process, the higher the productivity and final grain quality.

For effective prescreening of the feed material, KLEEMANN jaw crushers and impact crushers are equipped with an integrated or an independently vibrating double-deck prescreen. Wear in the crushing chamber is thus reduced by diverting the medium grain directly onto the vibrating extractor. The screen surfaces in the upper and lower deck can be changed easily and safely.

The advantages of active prescreening:
  • Increase in final product quality through discharge of fines via the side discharge conveyor
  • The feed material is largely freed of sticky or cohesive material and incrustation in the crusher or the vibrating extractor is thus avoided
  • Effective reduction in wear and increase in output by redirecting medium grain through the large crusher bypass device
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Optimum setup of prescreening

In order to tune the prescreening ideally to the material or application, the frequency of the prescreen can be adjusted steplessly. The correct selection of the screen surface is also important. Various punched plates or slotted grates are therefore available for the upper deck. The lower deck can be operated with wire cloth of different mesh sizes.

Wobbler feeder prescreening

In natural stone processing, every now and again stones are encountered that pose special challenges for optimum processing. Individual solutions are required here. This is why many plants can be equipped with a special wobbler feeder (instead of a double-deck prescreen) in order to screen sticky and clayey feed material thoroughly and efficiently.

The material is cleaned on the two-stage wobbler feeder and effective separation of the fines from extremely contaminated aggregate material is achieved.

Thanks to the elliptic lifting movements of the rollers, the material is evenly distributed and also freed of cohesive elements. Fines in the feed material fall through the rollers onto a side discharge conveyor and are effectively discharged.

Possible gap widths: up to 100 mm

The result

Higher product quality, maximum plant performance and less wear.