| 摘要 |
PURPOSE:To carry out continuous pickling of a steel strip economically in high efficiency, in continuously passing the steel strip through a pickling tank at a predetermined speed, by lowering the speed of the steel strip during the passage of the welded part thereof as compared to the speed thereof during the passage of the part other than the welded part thereof. CONSTITUTION:A steel strip 10 from an uncoiler 1 is introduced into a leveler 3 through a pressure roll 2 to receive predetermined leveling action. Subsequently, the treated steel strip 10 is introduced into a welding machine 5 through a shearing machine 4 to be welded with the trailing end part of the preceding coil and the welded steel strip is introduced into a pickling tank 9 through a loop car 7. In this case, the welded part thereof is detected by a welded part detector 8 provided to the inlet side thereof. This detected signal is sent to a pickling speed alterating indication apparatus 17 while this apparatus 17 gives speed reducing indication to a drive roll 18 to reduce the passing speed thereof during a time when the welded part of the strip 10 is passed through the tank 19. When it is known that the welded part is passed through the tank 9 by a timer or an appropriate detecting means, the apparatus 17 gives speed increasing indication to the roll 18 to increase the passing speed of the strip 10 in the tank 9 to a predetermined high speed. |
