Separation of cleaning bodies from a stream of fluid

Device for separating cleaning elements from a fluid stream, with

• a pipe wall for directing the fluid stream from an upstream side to a downstream side,
• a screen arranged inside the pipe wall with a frustoconical screen surface for guiding cleaning elements to a cleaning element extractor arranged in the direction of the downstream side,
• a lift-off device with at least one vortex body arranged at least substantially parallel to the screen surface at a distance from the screen surface the vortex body being arranged to rotate or swivel about a rotary shaft in such a way that it sweeps over the screen surface,
• wherein an intermediate space is formed between the vortex body and the screen surface,
• wherein the vortex body has a cover at least at the end directed towards the upstream side by which the intermediate space is partially closed such that the cover covers at least 5% and not more than 80% of a cross-sectional area of the intermediate space.