Rotary Discharger for Flat Bottom Circular Silos

The Saxlund Hydraulic Rotor silo discharger creates ‘mass flow’ for non free-flowing and difficult to handle materials on a ‘first in, first out’ basis and are is used widely in the Particle Board and Power industries. Since we introduced the Hydraulic Rotor many Several hundreds of these systems are in operation world-wide and are characterized by their ability to provide unequalled performance and reliability in operation.

Operating Principle

The Saxlund Hydraulic Rotor Silo Discharger method of operation is a simple yet effective way to discharge difficult materials from silos.

First the hydraulic rotor is set rotating by a planetary gear drive unit with the rotor arms retracted, in order to keep the starting torque low. After a short time the rotor arms are driven out hydraulically and brought to their working pressure. By being driven out the rotor arms then begin to cut their way through the material towards the silo wall. This breaks any bridging and brings the loosened material over the discharge opening and into the discharge screws. This action causes the column of material in the bunker to be broken down and flow into the discharge screws. If the resistance of the material is temporarily greater than the set working pressure, the rotor arms can retract as necessary under the control of the pressure limit valve. By being controlled by the pressure limit valve the potential for mechanical overload is excluded.

Technical specifications

Typical Silo Discharge Rates

Up to 130m3/hr (dependant on material and application)

Typical Sizes

  • Diameters 2.5 to 8m
  • Silo capacities 5 to 1000m³


  • Effective and simple operation
  • Uniform drawdown of material on “first in, first out” principle
  • Largest size discharge openings possible
  • Accurate discharge and metering of stored material on demand
  • Enclosed lidded design – no odour
  • External maintenance possible – even with the silo full
  • Flat bottom silos – more economical to manufacture /maximized storage

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