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履带式高地隙油茶果振动采收机设计与试验

Design and Test of Crawler-type High Clearance Camellia oleifera Fruit Vibratory Harvester

  • 摘要: 针对油茶人工采收效率低,劳动力成本大,且油茶果成熟期短、花果同期等问题,设计了可实现连续振动落果和收集的履带式高地隙油茶果振动采收机。采收机采用骑跨式车架沿油茶树种植行行走,利用曲柄摇杆机构驱动多排阵列的指排杆按照一定的运动轨迹对树冠两侧同时击打作业,落果通过收集板汇集后输送到果箱。根据击打轨迹对采收机击打装置的曲柄摇杆机构进行设计,并用ADAMS软件验证指排架运动轨迹。通过ANSYS软件对击打装置机架和采收机车架进行有限元模态分析,获得其前6阶固有频率,确定其不会发生共振。为接收振动掉落的油茶果,设计了高低错落分布的收集板,不仅能接收落果,且能顺利避开树干,实现整机在运动中完成振动落果和收集作业。最后,加工装配振动采收机样机,在击打液压马达转速为360 r/min条件下进行油茶林地整机试验,试验结果表明,油茶果采收率为87.56%,花苞掉落率为25.86%,满足油茶果采收要求。

     

    Abstract: Camellia oleifera industry has developed rapidly in China, and the planting scale has increased year by year. Aiming at the problems of low efficiency of manual harvesting, high labor cost, short ripening period of Camellia oleifera fruit and synchronization of flowers and fruits, a crawler-type high clearance Camellia oleifera fruit vibrating harvester which can realize continuous vibration fruit dropping and collection was designed. A straddle frame was used to walk along the planting line of Camellia oleifera, and the crank rocker mechanism was used to drive the finger row rods of multi row array to strike both sides of the tree crown at the same time according to a certain motion track. The fallen fruits were collected through the collection plate and transported to the fruit box. According to the hitting track, the crank rocker mechanism of the hitting device of the harvester was designed, and the motion track of the finger frame was verified by ADAMS software. Through the finite element modal analysis of the hitting device frame and harvester frame with ANSYS software, the first six-order natural frequencies were obtained to determine that there would be no resonance. In order to receive the fallen Camellia oleifera fruit, a collection plate with staggered height distribution was designed, which can not only receive the fallen fruit, but also avoid the trunk smoothly, so as to complete the vibration fruit falling and collection operation of the whole machine in motion. Finally, the prototype of vibration harvester was processed and assembled, and the whole machine test of Camellia oleifera forest land was carried out under the condition of hitting the hydraulic motor speed of 360 r/min. The test results showed that the average recovery rate of Camellia oleifera fruit was 87.56%, the average drop rate of flower bud was 25.86%, which fitted the requirements of Camellia oleifera fruit recovery.

     

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