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This paper establishes a flexible dynamics model of MQ2533 portal crane boom system. In the premise of ignoring control system, this paper analysis the mechanical dynamics of boom hoisting system. Simulation results show that: Dynamics response of the hoisting boom system have great fluctuation when excluding the control effects, this paper provide a theoretical basis for crane hoisting system to optimize control strategies, which committed to improve their performance and ensure safety, reliability and economy.

Reachstacker is an indispensable handling machinery, it will inevitably lead to unbalanced force at the job site. This paper does transient dynamics analysis for the spreader mechanism, which is one of the most significance key components. We get dynamic response of the spreader in lifting instant, results not only provide a reference for designers to understand the mechanical characteristics of spreader comprehensively, but also bedding for the future research.