American Society of Agricultural and Biological Engineers

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Vibratory Harvesting Machine of Boxthorn (Lycium chinense Mill) Berries

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  011097,  2001 ASAE Annual Meeting. (doi: 10.13031/2013.3438) @2001
Authors:   S. W. Lee, Y. K. Huh, J. D. So, S. R. Maeng
Keywords:   Lycium chinense Mill, Detachment rate, Vibration, Force-to-weight ratio,Harvesting performance

A research carried out to develop a vibratory boxthorn berry harvester. Physical and mechanical characteristics of boxthorn berries, strength properties of berry-stem joints, and detachment rate of berry with various vibration characteristics were analyzed. Also, based on studies above, a vibratory mechanical harvesting machine for boxthorn berries, consisted of a vibration generation and shaking system, a collecting system, and a traveling system, was developed and its harvesting performance was evaluated. Overall major and minor diameter of mature berries in average was 13.8 and 8.3 mm, respectively, among 12 varieties, and its sphericity was 0.7. The detachment force of mature berries was 2.7 times lower than the immature berries, and force-to-weight ratio showed the significant difference between mature and immature berries among 12 varieties. The most desirable shaking conditions, which showed high detachment rate of the mature berries, were frequency in the range of 94.2 – 125.7 rad/sec, amplitude in the range of 25 – 35 mm, and shaking time of 3 seconds experimented with experimental shaking system. The performance of boxthorn harvester was about 4717 g/hr and it was around 4.2 times higher than hand picking harvest.

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