| 摘要 |
The invention relates to jacks used for the displacement of anode frames of electrolytic cells designed for the production of aluminium. According to the invention, the jack ( 100, 100 ') comprises a sleeve ( 120 ) provided with an opening ( 121 ), an actuation rod ( 140 ) comprising an axial cavity ( 141 ) and a thread ( 142 ) and capable of moving in the said opening, a drive screw ( 130 ) inserted in the said axial cavity and capable of cooperating with the said thread so as to displace the said rod ( 140 ) in the sleeve ( 120 ) and in the said opening ( 121 ), a toothed drive wheel ( 150 ) coupled to the drive screw ( 130 ), and a worm screw that can be connected to the shaft of a drive motor ( 200 ) and that can cooperate with the drive wheel ( 150 ) so as to rotate it, and is characterised in that the centre-to-centre distance E between the axis R of the drive wheel and the axis V of the worm screw is between 100 and 350 mm, and in that the reduction ratio RR between the worm screw and the drive wheel is between 300:1 and 80:1. This jack is capable of simultaneously achieving relatively high powers and pull forces, while remaining within a relatively limited volume. |
