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| PLAN DU SITE |
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ANODE SCREW JACKS
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For jacking in aluminium smelters a standard screw jack is modified to cope with the harsh operating environment. Larger gears of a special bronze alloy, heat-treated steel alloy worm-shafts and large taper roller bearings all ensure durability. The lifting screw is specially forged to incorporate the clevis-end for added strength and heavy-duty seals protect the gear-set from Among the jacking systems provided are fixed position jacks (used extensively in Kaiser technology and similar technologies derived from Alcoa) that are robust enough to allow for a certain amount of side-loading stresses caused by thermal expansions. Where side loading is very high, a swivel-jack is employed. Invented by the company back in the 1960s and used extensively in end-to-end pre-bakes, these jacks allow for 3-degree movement in the lifting screw from the vertical. Virtually every smelter has different jacks although the principle is basically the same.
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