Design and Simulation Analysis of Tea Picking and Collecting Device

This study proposes a novel tea picking and collecting device. The device employs left-right reciprocating shear blades for precise tea cutting, and the sheared buds and leaves are efficiently transported into the storage bin via the synergistic operation of air ducts and a rear-mounted negative pressure fan. Following the parametric design of all components, simulation analysis of the tea shearing process was conducted by integrating the stress distribution of the shear blades and the rotational speed of the eccentric shaft to verify the structural safety and operational reliability of the device. Modal analysis results indicate that the natural frequencies of the 7th to 12th orders of the shear blade range from 111.96 Hz to 1043.3 Hz. The operating frequency （60 Hz） is 51.96 Hz lower than the minimum natural frequency, with a frequency margin exceeding 25%, effectively eliminating resonance risks during operation. Stress analysis of the fixed blade edge reveals a maximum deformation of 0.049822 mm and a maximum stress of 213.18 MPa, both within the mechanical safety thresholds of the selected material （440C stainless steel）. This research provides valuable theoretical support for the optimization and engineering application of tea picking and collecting equipment.