Design and Experiment of Universal Shaking Jujube Dropping Device

Abstract:

In response to the problems of low harvesting efficiency and high risk coefficient of local jujube in hilly and mountainous areas, a shaking-type jujube harvesting device was designed, which used an eccentric disk to drive a steel wire rope for traction and shaking the tree body to make the fruits fall smoothly. Based on detailed kinetic analysis, a double-pendulum model of jujube fruit-stalk" was established. Combining with actual measurement data, the natural frequency of the system was obtained as 9.96 Hz, and the average acceleration required for vibrating and detaching jujubes from their stalks was 283.81 m/s2. A flexible model of the jujube tree was established through Hypermesh software. By integrating ADAMS software, a comprehensive rigid-flexible coupling simulation test of the jujube shaking and harvesting process was carried out. Taking the shaking frequency, amplitude and shaking time as influencing factors and the harvesting rate as the evaluation index, an orthogonal test was carried out. The test results showed that the optimal parameter combination was a shaking frequency of 9.835 Hz, an amplitude of 50.602 mm and a shaking time of 5.387s. Under these parameters combination. The field test results showed that the average harvesting rate of jujube fruits was 97. 5%, which provided a valuable design reference for the development of harvesting machinery for small-sized fruits such as jujubes in similar regions.