| 摘要 |
PURPOSE:To enable early detection of shifting of shaft system by providing sensor group for detecting the pulsating hydraulic pressure at each portion, sensor group for detecting the temperature distribution of guide bearing in circumferential direction, sensor group for detecting the thickness of oil film at the guide bearing and sensor group for detecting the shift at each portion in the shaft system. CONSTITUTION:Sensors (a)-(e) are provided to detect the pulsating hydraulic pressures in the casing 1, the back pressure chamber 14 at the outside of runner, the back pressure 13 at the inside, the side pressure chamber 17 and the upper suction tube 8. Furthermore, a plurality of sensors (f) for detecting the temperature distribution of a guide bearing 10a in circumferential direction, sensors (g) for detecting the thickness of oil film formed between the guide bearing 10a and the spindle 7 and sensor (h) for detecting the shift of spindle 7 are provided. It is decided that the shaft has shifted if the outputs from the sensors (f)-(h) have exceeded over respective limits even though the pulsating hydraulic pressures to be detected through the sensors (a)-(e) are within respective limit thus to produce a shaft shift signal. |
