| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high torque to a winch when the winch of a crane is applied with a high load without enlarging an electric motor and a hydraulic motor and prevent the shortage of a torque applied to the winch. <P>SOLUTION: In a winch operation controller 1 of a crane, if a rope tension to a load suspending winch 50, which is derived by a moment limiter 12, is larger than a predetermined value, a control mechanism 14 enables both a load suspending winch electric motor 2 and a load suspending winch hydraulic motor 8 to supply power to the load suspending winch 50 for operation of the load suspending winch 50. On the other hand, if the rope tension derived by the moment limiter 12 is equal to or less than the predetermined value, the control mechanism 14 does not permit the load suspending winch hydraulic motor 8 to supply power to the load suspending winch 50 but permits only the load suspending winch electric motor 2 to supply power to the load suspending winch 50 for operation of the load suspending winch 50. <P>COPYRIGHT: (C)2013,JPO&INPIT |
