核桃振动采收研究现状与发展趋势OACSTPCD

As a kind of high added value crop,walnut has wide market demand and good economic benefits.With the continuous expansion of China's walnut planting area and the development of agricultural mechanization,the problems of low recovery rate and low net rate of walnut harvesting have become increasingly prominent.It is of great signifi-cance to develop walnut efficient harvesting equipment suitable for different planting modes in China to promote walnut production scale and promote agricultural scientific and technological innovation.In view of the development of walnut harvesting technology and equipment in the world,the research status of mechanical harvesting equipment for walnut with complex site conditions,pecans with small row spacing dwarfing and dense planting mode,and pecans with standard orchard planting mode were reviewed.The vibration mechanism of pecans was analyzed and demonstra-ted from three perspectives,i.e.,branch vibration,trunk vibration,and crown vibration.The clamping mode and pa-rameters of vibration harvesting in the world were analyzed.At present,there are several main problems in the practi-cal application of walnut machinery in China and the research of vibration mechanism is limited,which leads to prob-lems in design and uses.Due to soil conditions,geographical location and other factors,walnuts in different regions have different growth characteristics and quality characteristics,so the existing mechanical picking equipment cannot adapt to the needs of different regions.Due to the high planting density,a large number of fruits are distributed on the branches.If the fruits are picked,a large number of fruit branches would be broken off and fruit branches would fall.Therefore,the current mechanical picking equipment cannot be used for the large-scale harvesting work.Most of the existing mechanical harvesting equipment has a single mechanism,which can only harvest the same fruit in a single way,so it cannot achieve continuously harvesting.The main problems existing in the practical application of vibration harvesting technology were analyzed.It was pointed out that the complex structure,difficult to determine the working parameters and low degree of intelligence were the factors restricting the development of walnut harvesting machinery in China.According to the characteristics of China's walnut planting mode,this paper summarizes the in-depth re-search on vibration harvesting mechanism,energy transfer,precise positioning,flexible operation,etc.The future trend of intelligent and diversified development of walnut harvesting machinery can provide a new idea for the devel-opment of vibration harvesting technology and equipment.