| 摘要 |
PURPOSE:To effectively utilize the cooling water, by reducing the pressure of the high pressure water for use of descaling the rolled material, in order to use it for cooling the rolling during the period that the descaling work with the high pressure water is interrupted. CONSTITUTION:The work rolls 3, 4, and the backup rolls 1, 2, are cooled by the low pressure water (3-7kg/cm<2> or so) sprayed from the nozzle headers 6, 7, 8, 9, through the ducts 15, 16. On the other hand, the rolled material is descaled by jetting the high pressure water (150-170kg/cm<2> or so) from the nozzle headers 10, 11 through the duct 19, the spray valve 20 and the branch ducts 17a, 17b. The sequence valves 23, 24, are attached to the nozzle headers 10, 11 and are scheduled so as to close for the low pressure water. When the descaling work comes to end, the spray valve 20 is closed and the changeover valve 27 is opened. The high pressure water is throttled by the by-pass orifice, and becomes the low pressure water which is then introduced into the low pressure ducts 15, 16 through the duct 21 and the branch ducts 22a, 22b; this low pressure water is sprayed to cool the work rolls 3, 4 and the backup rolls 1, 2. |
