The working stability and the efficiency of a remodelled excavator having an expansion arm with a small ground undercarriage

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  • 腕関節部接地式森林作業機械の安定性と消費エネルギーの解析
  • ワンカンセツブ セッチシキ シンリン サギョウ キカイ ノ アンテイセイ ト

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The remodelled excavator we propose in the present study has a jointed expansion arm together with a small ground undercarriage at the forward end of the middle section of the arm. This ground undercarriage is designed to rest on the ground to support the middle section and the expansion arm beyond. If the standard base machine's bucket can hold 0.25 m3 of excavated soil and the added expansion arm is 1.5 or 3 m long, the remodelled excavator can have a working radius equal to those of conventional 0.45 or 0.7 m3-class excavators, respectively. Simulating the work of moving a load (0, 1.96, and 3.92 kN) upslope to the excavator along a slope (5 to 35°), we calculated the working stability and the efficiency of the conventional 0.45 m3-class excavator and those of the 0.25 m3-class remodelled excavator. As a result, the stability of the remodelled excavator working on a slope with a gradient of less than 25° proved to be greater than that of the conventional excavator, if the joint between the first and middle sections of the arm is made free of moment. When comparing their working efficiencies in terms of the ratio of the pure workload to the power consumption, the remodelled excavator has a working efficiency which is two to four times that of the conventional excavator.

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