Drop simulation and structural optimization design of garden pruning machine
                                                SUN Liang1,2, CHEN Xi liang1, CHENG Bei3, QI Ming si2, XIAO Jiang jian1
(1.Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;2.School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China;3.Ningbo Cheery Garden Tools Co., Ltd., Ningbo 315505, China）

Abstract: Aiming at the problem that the garden pruning machine might be damaged result from the drop in the course of use and transportation, the dropping process of the key parts of the pruning machine was studied. Simulation analysis was carried out for two kinds of drop conditions namely horizontal falling and vertical lateral falling of the pruning machine based on Hypermesh and LS DYNA. The maximum impact stress and damage location of the key parts after the fall of the pruner were gotten. The actual drop test was carried on the pruning machine and observed the location of the damage. Based on the results of simulation and experiment, we knew that rotating tube was the easily damaged part of the pruning machine. Pruning machine service life was affected by the drop impact. The structure of the rotating tube was optimized and verified by the drop simulation. The results indicate that the key parts of the improved structure don t damage dropped under the two limiting conditions and meet the design requirements.

Key words: pruning machine; drop simulation; rotary tube; structure optimization