| 摘要 |
PURPOSE:To prevent the slip-off of a workpiece from a hook by increase/ decrease-controlling the fluid pressure acting onto a rotary hydraulic cylinder which opens and closes a chuck hook, thus compensating the grasping force. CONSTITUTION:The high-pressure hydraulic working oil supplied from a hydraulic source 14 is supplied into the cylinder chamber of a rotary body 7 through an electromagnetic proportional reducing valve 13 and a direction selector valve 16. Then, a hook 3 shifts towards the inside center and a workpiece 4 is caught. The grasping force is determined according to the hydraulic pressure introduced into the rotary body 7. Therefore, the pressure for generating a proper grasping force is adjusted by providing the proper electric current value for the reducing valve 13 by a pressure gauge 15 and the pressing button 17A of a revolution speed setting device 17. Therefore, the grasping force due to the hook 3 is compensated.
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