Load determination of casting cranes
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Full title: |
Load determination of casting cranes (MBS) |
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Contributor: |
Dr.-Ing. Thomas Rosenlöcher (TU Dresden, IMM) |
| Objective: | The structural design of the drivetrain components for main hoists in cranes requires, in addition to fulfilling the function of lifting and positioning of loads, the consideration of high safety requirements. In the particular case of crane systems that are used in the steel industry and serve for the transport of open casting ladles, failure of the drive train can lead to property damage and personal injuries. The components of the drive train and the rope drive of the respective hoist drives are therefore designed in a redundant manner. Additionally, the extended regulations for the construction of reliable cranes for the transport of molten masses must be considered in the design. A challenge for manufactures and operators of hoists is the dimensioning of components and safety equipment. Since no considerable additional loads occur under normal operating conditions, special load cases which lead to special load cases must be considered for the design process of the drive train. |
| Approach: | The simulation model of the crane hoist required to describe this complex structure must include the properties of the drive train, the electric drive unit and the load-side elements such as the rope drum, ropes, cross beam and ladle. The parameters required for creating the models can be found in the design documents. In addition to the consideration of shafts, couplings and helical gearing, the modelling of crane hoists must also take into account the exact representation of planetary gear units with power splitting, of rope drives with elastic coupling of the load and of braking torques as external, retroactive load input functions. |
| Results: | Due to the known external loads, which can be derived from the load of the ladle and traverse as well as the brake force curves, an exact representation of the existing dynamic conditions is possible. The special load cases that occur are decisive for the maximum stresses in the drive train, which can be present as an emergency stop with or without damage to a torque-carrying component in the drive train. For the analysis of the load cases, the possible combinations for the mass of the load to be lifted and the lifting direction must be considered in addition to the cause for the triggering of an emergency stop. |
© IMM
© IMM
