| 摘要 |
With a simple structure, a mast is stood upright during installation and during maintenance, resulting in a reduction of stress between the mast and a lower carriage during normal travel. A stacker crane includes: a lower carriage having a lower drive wheel, a lower travel motor, and a support located apart from the lower drive wheel; an upper carriage having an upper drive wheel and an upper travel motor for driving the upper drive wheel; and a mast fixed to the lower carriage, standing upward from the lower carriage and connected to the upper carriage, and having a transfer device capable of rising and falling. A displacement mechanism for raising and lowering the support is provided on the lower carriage between a grounded position supported by a lower rail and a retracted position lifted off the lower rail. The support is lowered to the grounded position when the stacker crane is installed between the lower rail and the upper rail and when the stacker crane is stopped for maintenance, and the support is raised to the retracted position when the stacker crane is operated. |
