| 摘要 |
PURPOSE:To remove even fine foreign matter sticking to the periphery of a drum completely by spraying high-pressure cleaning liquid purified by a coarse mesh filter to the periphery of the drum and removing fine foreign matter which sticks to the periphery of the drum again using low-pressure cleaning liquid which is purified by using a finishing filter. CONSTITUTION:A high-pressure cleaning liquid discharged from a pump 50 runs through a main liquid transport path 60, then passes through a coarse mesh filter 63 interposed in the main liquid transport path 60. Finally the high- pressure cleaning liquid is ejected to an unfinished aluminum tube from a nozzle in a cleaning tank 30. This is because all the solenoid valves 61, 62, 64 of the main liquid transport path 60 are open and other solenoid valves 71, 73, 81 are closed. Next, finish cleaning process is performed and part of the cleaning liquid discharged from a pump 50 passes through a bypass path 80, flowing into the cleaning tank 30 directly. At the same time, the remaining cleaning liquid runs through an auxiliary liquid transport path 70 in a reduced pressure state. The cleaning liquid which has flowed into the auxiliary liquid transport path 70 is purified by a finish filter 72 and the purified liquid is sent to the nozzle 20 in the cleaning tank 30. |
