Abstract
Dynamically operated hoist systems are exposed to different load cases, which may induce high loads to the drivetrain. The paper shows the load cases and additional equipment, to restrict the loads out of these load cases to the hoist. Especially in focus are optional measures for the exceptional load cases emergency stop snag load. The load cases are listed including affiliated equipment and aspects to be considered during design phase.
Highlights
Cranes in general and hoists especially comprise in transhipment of bulk or containers increasing operational speeds
Due to high operational speeds the lifting systems are on high levels of kinetic energy
Relevant load cases may be correlated with the load case grouping according to [2]: Regular loads, non-regular loads and exceptional loads
Summary
Cranes in general and hoists especially comprise in transhipment of bulk or containers increasing operational speeds. A special example with regard to this are ship-to-shore container cranes. Today they cover lifting heights up to 72 m with lifting speeds of up to 180 m/min. Due to high operational speeds the lifting systems are on high levels of kinetic energy. This will affect system design in order to ensure safety for all operational situations, especially in situations in which the system has to be braked down. Safety comprises for example aspects as observance of intended operation, structural integrity [1], limited braking distances and availability of equipment. Relevant load cases may be correlated with the load case grouping according to [2]: Regular loads, non-regular loads and exceptional loads
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