| 摘要 |
PURPOSE:To simplify the work of flaw detection by eliminating the need for the control of concn. and for taking care of a device owing to clogging with magnetic particles, etc. by cyclic use of magnetic particle liquid. CONSTITUTION:A pressure feed pump 16 is kept driven at all times, and when the operating position of a directional control valve 17 is in the position (a), the connection between an inlet side pump 14 and an outlet side pump 20 are interrupted and the spraying of magnetic particle liquid is held stopped. At this time, the magnetic particle liquid from the pump 16 is fully returned through a circulating pipe 18 into a magnetic particle liquid tank 13. The returned magnetic particle liquid is ejected into the tank 13 in its circumferential direction, and agitates the magnetic particle liquid in the tank. When the valve 17 is changed over to an operating position (b), the pipe 14 is connected to the pipe 20, and the magnetic particle liquid is sprayed from a spraying nozzle 22 so as to spread sectorally in the form of mists. |
