Abstract:In view of the difficulties in picking chestnuts in hilly areas, the high intensity of manual harvesting and the low efficiency of harvesting, a small shaking branch type chestnuts dropping device with the vibration of flexible wire rope was designed. A single pendulum model was established to analyze the conditions of fruit shedding. The tangential acceleration of fruit shedding was 285.36m/s2, and the main factors affecting fruit shedding were the frequency, amplitude and time of branch vibration. The vibration characteristics of chestnut fruit branches were tested. The frequency range of chestnut fruit branches in the vertical direction was determined by sweeping frequency mode of 0~30Hz with Default Shaker hydraulic shaking table, and the standing frequency test was carried out in the frequency range of 7~15Hz. The optimal frequency range of vibrating fruit fell was found to be 10~12Hz. According to the results of the fruit branch vibration test, ADAMS was used to simulate the shaking mechanism. The results showed that when the rocker amplitude was greater than 95mm, the acceleration of the end of the fruit branch could meet the acceleration conditions of the chestnut fruit vibration, and the rationality of the parameter design of the fruit dropping device was confirmed. A three-factor and three-level field orthogonal test was designed, and the results showed that the highest fruit drop rate was the shaking frequency of 11Hz, the amplitude of 135mm, and the shaking time of 30s. In the experiment, the highest fruit dropping rate of chestnut was 91.9%, and the bark damage rate was 8.8%, which met the bark damage standard of agricultural machinery popularization and identification.
