Sealing lock for a vaccum chamber

摘要

Sealing chamber comprises enclosure (1) containing at least three successive rollers (2a, 2b, 2c) in strip movement direction. First and third rollers are located on one side of passage between rollers, and second roller is situated on opposite side. Sealed zone is formed between strip and first and third rollers and connected to pump. Devices are provided for regulating strip pressure on rollers. Devices are provided for regulating the distance between at least two successive rollers (2a) and (2b) or (2b) and (2c), and for tensioning the strip (3) so that the strip (3) can recover the difference in pressure existing between two consecutive zones. Sealing elements (4) are provided between the wall of the enclosure (1) and the rollers (2a, 2b, 2c). The strip is especially a steel strip.