关键词: 太子参, 振动挖掘, 挖掘铲, 入土角, 有限元分析

Abstract: In order to reduce the digging resistance of Radix Pseudostellariae harvester under mountainous environment in Fujian province, a kind of excavating mechanism of Radix Pseudostellariae with vibration function was designed. Based on the analysis of the planting environment of Radix Pseudostellariae and the force of the digging shovel, the main technical parameters such as the digging depth h, the excavation angle β, the cutting angle θ, the length L and the width b of the digging shovel were designed. According to the kinematics principle of eccentric mechanism and fourbar mechanism, the kinematic characteristics of excavator shovel were analyzed, and the kinematics simulation was carried out by ADAMS software. According to the normal force calculated by theoretical load of excavator, the statics analysis of excavator was carried out by using ANSYS finite element software. Through field testing and monitoring of excavation resistance under different working conditions, the functional and theoretical analysis results of vibration excavation mechanism were verified. The results showed that the mining mechanism can realize the sinusoidal wave reciprocating vibration. When 563.85 N normal force was applied to the excavation shovel surface, the maximum stress of the excavation shovel was 141.87 MPa, less than 355 MPa of 45 steel, which meet the stress requirements. The field test results showed that the vibration excavation resistance varies between 1 320 N and 1 583 N under different working conditions, which was less than the excavation resistance of 1 604 N without vibration, indicating that the vibration excavation of Radix Pseudostellariae has the effect of reducing the excavation resistance. The average mining resistance was 1 458 N, close to the theoretical calculation data of 1 505.181 N, which further verifies the rationality of the theoretical calculation.

Key words: Radix Pseudostellariae, vibration excavation, excavation shovel, angle of excavating, finite element analysis