| 摘要 |
PURPOSE:To detect automatically states of internal wastage, deterioration and wear of a hydraulic instrument by detecting a pressure, a flow amount and a wear particle concn. of a hydraulic fluid and a displacement of a functioning part material and by comparing a mutual relation of these detected values with a criterion value and a permissible deviation. CONSTITUTION:An oil pressure of a hydraulic cylinder 8d is measured by a pressure gauge P, the flow amount of a drain circuit U is measured by a flow meter 9, the wear particle concn. in the functioning oil is measured by a wear particle concn. meter 10. In the meter 10, the functioning oil returns to a tank 3 from a bypass type line 19 through a pipe line 17 in the detector, and the magnetic wear particles in oil particles are captured by gradient magnetic field of a permanent magnet 18 in an order of the particle size. The wear particle concn. is displayed on a display device 11 by an electrostatic capacity unit 20 and a detector 21 of large and small particles. These detected values and the deviation of a steam valve V are compared with the criterion value and the predetermined value of the permissible deviation, and the states of the internal wastage, deterioration and wear of the hydraulic instrument are detected automatically. |
