| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a bucket drive mechanism having a variable speed (including stop) and higher efficiency and a lighter weight while solving the problems on noises involved in a signal line connecting a motor control device to a bucket (a motor). <P>SOLUTION: The bucket drive mechanism opens/closes the bucket with the operation of a bucket cylinder 1 using operating oil supplied from a hydraulic pump 3 driven by a magnet motor 4 mounted on the bucket. The motor control device 7 is installed on a crane crab and connected to the bucket via a cable. A signal showing a pressure value for the operating oil in a hydraulic circuit which supplies the operating oil to the bucket cylinder 1 is introduced to the motor control device 7 which controls the rotating speed of the motor 4 in accordance with a rotating speed pattern preset in the motor control device 7 to operate the bucket cylinder 1. <P>COPYRIGHT: (C)2008,JPO&INPIT |
