Description: The centrifuge differential gear unit is the core transmission component for horizontal decanter centrifuges. It generates stable, controllable minor speed difference between drum and scroll to realise continuous solid slag discharge. It is standard equipment for starch, lysine and citric acid production line decanter centrifuges.
Drum and scroll rotate in identical direction but at different rotational speeds.
High speed drum rotation creates centrifugal force; solid particles settle against drum inner wall.
Scroll blades rotate slightly slower than drum (differential speed Δn).
Relative motion between scroll and drum pushes settled solid materials continuously toward slag discharge port, while clarified liquid flows out via overflow outlet.
Differential speed normally equals 0.5 5 % of drum rotational speed. Zero differential speed: scroll rotates synchronously with drum, solids cannot be discharged. Excessively large differential speed: agitates process liquor, degrades separation performance and increases cake moisture content.
1. Deliver stable differential rotational speed for continuous scroll driven slag discharge.
2. Amplify output torque to provide sufficient material pushing force for scroll.
3. Overload protection: Integrated torque limiting device slips under material blockage conditions to prevent scroll fracture and equipment damage.
4. Adjustable differential speed to match dewatering requirements of different feed materials.
1. Planetary Gear Differential Gear Unit (Most Common, Two Stage 2K H Planetary)
Structure: sun gear, planetary gears, internal ring gear, planetary carrier. Housing connects to centrifuge drum; output splined shaft couples to scroll. Advantages: high torque output and stable running; mainstream configuration for starch process decanter centrifuges.
2. Cycloidal Pinwheel Differential Gear Unit
Adopts cycloidal pin gear transmission; compact layout and large reduction ratio. Selected for medium and small size decanter centrifuges.
3. Hydraulic Differential Gear Unit
Scroll is independently driven by hydraulic motor for stepless adjustable differential speed. Higher procurement cost; used for high precision production lines with variable process conditions.
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