| 摘要 |
PROBLEM TO BE SOLVED: To provide electric hoists reducing inclination of a suspended cargo due to each load block positional deviation in shared suspension by the two electric hoists. SOLUTION: These electric hoists perform inverter-controls to raise and lower the suspended cargo. The load blocks are provided with sensors as means to perform not only position controls of the load blocks by moving distance recognition using output pulses when rotating a motor by encoders but also controls by directly recognizing distances between the electric hoists and the load blocks and to correct the positional deviation due to elongation of a wire rope and a difference of outer diameters of drums. Radio is used for transmitting directly recognized distance information to a control circuit. Shared hanging work with high accuracy preventing inclination of the suspended cargo can be performed without losing balance. COPYRIGHT: (C)2009,JPO&INPIT
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