Boerger Rotorrake


Boerger Rotorrake

The Rotorrake is a robust, single-shaft coarse chopper in an inline version.

Blades and counter-blades are mounted one after the other on the carrier shaft. The sturdily attached counter blades are each cleaned by rotating cutting blades on both sides. The blades are moved by the rotating shaft.

The Rotorrake comes in different sizes (throughput volumes of up to 800 m³/h) and tackles chopping tasks where others have failed – for chopping very coarse solids and blockages.


Rotorrake components

1 Quick-release cover The cover to the interior of the Rotorrake allows quick access to all wetted parts.
2 Blade holder and counter blades Robust blades and counter blades are mounted in alternating order. The fixed counter blades are attached. Blade and counter blades can be turned around to use on both sides
3 Debris collector When extracting hard solids, the blade rotates forcing the solids which cannot be chopped into the debris collector.
4 Block casing The casing is produced as a single-piece block casing made of gray cast iron or stainless steel.
5 Drive Three drive model versions are available: Parallel shaft helical gear motor, hydraulic motor, bearing carrier with bare drive shaft end.


Operating Principle



The Rotorrake is a blockage-free single-shaft coarse chopper with radial flow and excellent extraction of hard substances. Its powerful chopping force enables the Rotorrake to be used in applications such as waste water processing for effective chopping of solid items.

The solids fed in with the liquid flow through the counter blades which are fixed at an angle. The solids are then captured by the counter blades and chopped by the cutting action of the rotating blades. The chopped solids then continue to flow with the liquid. Coarse objects which cannot be chopped are ejected into the debris collector.

Throughput volumes up to 800 m³/h (3,523 usgpm/h)

Reversible flow rate



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