Method and device for controlling the movement of a feeding and breaking chisel in an aluminum production cell
US6436270B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1999 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Jul 19, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25C3/14
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method and a device for controlling the movement of a combined alumina feeding and crust breaking chisel in an aluminum production cell, wherein the chisel is moved downwards and upwards by means of a pneumatic cylinder which is alternatively fed with pressurized air, wherein electrical contact between the chisel and the melt is detected when the chisel reaches the melt, wherein it is monitored whether said electrical contact has been reached within a predetermined time interval, and if not, air at a second, high, pressure is fed to said first, and wherein air at high pressure is fed to the second side of the cylinder after said electrical contact has been established so as to quickly withdraw the chisel from the hot melt in order to minimize heat transfer from the melt to the cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.