Flexible unloading method of large crane

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (7) : 207-213.

LIU Yang

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Abstract

Frequent large load unloading impact during dynamic consolidation is the main reason for crane structure damage and high failure rate. Aiming at the problems of large dynamic consolidation impact and low equipment life, the mechanism of crane unloading impact is discussed, and a new method for reducing unloading impact through the energy consumption of the unloader is proposed. The law of system energy transfer in the crane-weight hammer model is studied, the principle of flexible unloading is proposed, and a mathematical model describing the key parameters of flexible unloading is established. According to the basic theory of multi-body dynamics, a rigid-flexible coupling model of the crane is established, and the relationship between unloading time and impact response is predicted by simulation, which validates the theoretical model of flexible unloading. According to the theory of flexible unloading, a force-control-based flexible unloader is designed between the crane and the heavy hammer, and the suspension tension control is transformed into hydraulic pressure control. The test proves that flexible unloading significantly extends the unloading time, which provides a reference for the design of a class of impact machinery.

Key words

Dynamic compaction / Flexible unloading / Rigid-flexible-model / Mathematical model / Force control device

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LIU Yang. Flexible unloading method of large crane[J]. Journal of Vibration and Shock, 2022, 41(7): 207-213

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