Abstract
The aim of this research is the development of a lightweight large excavator. This is due to the need to reduce the system suitable for its movement and to increase the hourly production of the excavator. This lightweight is done on all the main components by adopting aluminum alloy and composite materials. The study, developed in analytically and in numerically way, considers different loading conditions to which the excavator can be subjected during its use. The new solution was developed in order to have almost the same performance for safety coefficient, displacement and so the stiffness and critical buckling load. The excavator in its minimum weight configuration, obtained by applying composite materials for arms and hydraulic cylinders while aluminum alloy for frame, has an operating weight that goes from the value of 577.6 kN to the value of 425.8 kN with a reduction of over 26%. With this result, three important factors are to be underlined: increase in capacity which depends on the geometric configuration of the arms (about +41.5%); a significant reduction in ground pressure allowing the use of the excavator in previously inaccessible places and finally greater ease in transporting the machine.
Published Version
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