Duff Norton pioneered the anode jack in conjunction with the aluminium industry. Anode jacks were used in the first commercial aluminium-making plant in the United States and continue to be used in aluminium plants throughout the world.
Duff Norton has manufactured and supplied numerous jacking systems for aluminium smelters around the world including screw jacks, bevel gearboxes, speed reducers and shafts as well as couplings driven by electric and air motors.
Anode screw jacks are used for the lowering and precise positioning of anodes and anode beams in a vast majority of aluminium smelters. A special screw jack called the anode jack has been modified for use in anode beam positioning to cope with the harsh operating environments of aluminium smelters.
Also known as pot jacks, anode screw jacks are mechanically linked through a combination of drivetrain components with their position monitored electronically to attain potline efficiency.
Key features of Duff Norton anode jacks:
- Heavy duty construction to withstand the high temperatures and loads of alumina smelting process
- Heavy duty version of standard actuators modified for each smelting facility’s specific application
- Large overload capacity handles side loading stresses caused by thermal expansions and contractions of frames
- Built to take compressive overloads caused by occasional highjacking of the frames and frozen pots
- Worm gears made of wear resistant bronze are up to 40% larger than standard versions
- Larger bearings anode jacks use only heat-treated alloy steel worms
- High temperature grease with heavy duty sealing prevents ingress of alumina dust
- Retrofit or repair of all existing anode jacks, screw jacks and actuators provided