Analysis on the Fatigue Break Mechanism of the Brush-Shape High Molecular Cleaning Element

摘要

The brush-shape cleaning element of the sugarcane harvester has short lifetime and is easy to rupture mainly because of fatigue breakdown. Based on the structural characteristic and the working mechanism of the macro-molecule material cleaner, this paper detailedly studies the main factors which cause the cleaner to be broken. These factors are the installation of the cleaner, and the effected mechanism of the surface and internal defect formed during the injecting of the cleaner. The numeric simulation orthogonal experiment is used to optimize the installation parameters. The stress existing in the root and the defective location and fatigue lifetime of the cleaner are analyzed by CAE software and tested through experiment before and after the optimization. The result shows that the stress existing in the root of the optimized cleaner is greatly improved, and the fatigue lifetime is effectively prolonged. Even if there is a defect in the cleaner, the lifetime after optimization is obviously longer than that before optimization.