| 摘要 |
PURPOSE:To perform pressure control of each pressure chamber easily by putting the grease pressure in an inner situated pressure chamber higher than the grease pressure in pressure chamber on the cutter side or than the external pressure, and performing the supply of a grease to the seal surfaces. CONSTITUTION:To refill grease to a booster 11, the air pressurized by a compressor 19 is supplied to the primary side 14 of the booster 11 via an air piping 16 so that a piston 23 is held on the secondary side of the booster 11. Then a grease supplying device such as a grease pack 20 is put in operation, and a direction selector valve 15 on the path of a grease supplying piping 10 is shut while direction selector valve 17 on the air piping 16 is released to the atmosphere, and further a direction selector valve 21 on a supply piping 22 for grease is closed to refill grease to the secondary side 13 of the booster 11. Then the last named valve 21 is closed, and also the valve 17 on the air piping 16 is shut, and the air set by a pressure setting device 18 is supplied to the primary side 14 of the booster 11. The grease pressure is sensed by each pressure sensor 8, and the set pressure is controlled. |
