| 摘要 |
PURPOSE:To accurately detect abnormality in the feeding of lubricating oil and compressed air to a lubricated part by monitoring the pressure difference between the pressure in the oil feeding passage between a defined quantity discharging device and an air-oil mixing device, and pressure in a feed pipe for feeding a lubricating oil into said defined quantity discharging device. CONSTITUTION:A compressed air from a pump 1 into which a lubricating oil is mixed by an air-oil mixing device 7 in each of branch pipes 32, is fed into each of lubricated parts 2. The lubricating oil to be mixed is fed from an intermittent feeding source 4 to each of defined quantity discharging devices 6 via a feed pipe 5 and, further, from the defined quantity discharging device 6 to the air-oil mixing device 7 through an oil feeding passage 51 having two check valves 8, 9. A pressure sensor 12 detects the pressure difference between pressure in the feed pipe 5 and the pressure between both the check valves 8, 9. And, throttles 10, 11 are provided on the upper and lower course sides of the air-oil mixing device 7 respectively to make pressure in the branch pipe 32 act on the oil feeding passage 51, and the output signal of the pressure sensor 12 is inputted into a detecting means 14 to judge abnormality. |
