气吸式大青叶采收装置的设计与试验OA

In order to solve the problems of root damage and low harvesting efficiency caused by the harvesting of Folium Isatidis,an air-suction Folium Isatidis harvesting device was designed.The force analysis of the key components of the limit support mechanism was carried out,and the angle between the limit support rod and the ground was determined to be 30°.When the device was working,the cutting height was adjusted to ensure that the cutting knife did not damage the root growth point of the plant,and the limit holding mechanism was fixed.The Folium Isatidis was cut by the cutting knife under the support of the limit support mechanism,and then the negative pressure suction was generated by the centrifugal fan,and the cut leaves were inhaled into the suction pipe and quickly transported to the leaf collection box.The air flow field in the pipeline was simulated by CFD technology.The pipeline diameter range was 0.12-0.20 m,the interval was 0.02 m,the wind speed range was 1-20 m/s,and the interval was 1 m/s.The air flow field distribution law of the pipe-line at the above levels was explored,and the parameters of the suction pipeline were optimized.The CFD simulation re-sults showed that when the wind speed and pipe diameter increased,the mass of the suction blade of the device increased significantly.According to the actual situation,combined with the diameter of the Folium Isatidis,the energy consumption of the device,the structural stability and the CFD simulation results,the diameter of the suction pipe was determined to be 0.16 m.The field test of the device was carried out continuously for 3 h,and 0.48 hm2 of Folium Isatidis were harvested.The net yield was as high as 93%,and the root damage rate was 7%,which was about 60%higher than the manual effi-ciency.The operation of the device was efficient and reliable.