KNOLL Maschinenbau GmbH Schwarzachstraße 20
D-88348 Bad Saulgau

Tel.+49 (0) 7581/2008-90388
Fax+49 (0) 7581/2008-90140

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Return pumping station RIK

Areas of application

The type RIK return pumping station is a compact chip conveyor station that may be integrated into a machine bed. It is used for the unmanned transport of medium amounts of chips and cooling lubricants from the processing machine to a filter. This construction unites the characteristics of conventional solutions from chip conveyors and separate pumping stations into a combined unit. Chips that result during the machining of materials such as castings or aluminium are particularly suitable. Steel chips are suitable only if they are of uniform length and are in small quantities.



  • Fully automatic, unmanned chip transport
  • Little space required, other than for the machine
  • Low overall height, ideal for automation facilities
  • Chip reducer may be retrofitted
  • Hopper and screws adjustable at the machine tool
  • All drives and maintenance areas are outside of the machine tool



The chips and the cooling lubricant arrive from the machine tool into the screw trough. One or more screw conveyors transport the chips horizontally directly into the chip reducer. After the chips are reduced, they as well as the cooling lubricant arrive in the pump back tank. The chip/cooling lubricant mixture is then fed uniformly into the return pump, which transports it by return pipe to the central or decentralised separating/filtering unit
The controlled interaction between pump and metering unit ensures safe chip transport, independent of the chip shape and the resulting amount of chips or cooling lubricant. For small chips without a tendency to form clusters, no chip reducer is necessary.

Pump back station RIK