基于偏载工况的装载机工作装置刚-柔耦合分析

Rigid-flexible coupling analyses of loader working device based on offset load

为能够更加全面真实地反映装载机工作装置在偏载工况下的动臂受力和变形规律,利用ADAMS和EASY5软件建立装载机工作装置的刚-柔、机-液耦合的联合仿真模型。通过样机测试数据对仿真模型的正确性进行分析验证,并进一步深入探讨提升油缸的连通式和独立式连接方式对动臂受力的影响。对比分析发现:极限偏载崛起工况下,连通式的动臂最大应力很接近许用应力,因此,在交变载荷作用下很容易产生裂纹;而独立式连接方式既可以防止动臂过载,也提高了动臂的抗扭能力。这为装载机工作装置的设计提供了有益借鉴。

To comprehensively reflect the force and deformation of working device of the loader under offset load condition, a mechanism-hydraulic and rigid-flexible coupling co-simulation model of the loader working device was built by ADAMS and EASY5 software. Based on the correctness of co-simulation model verified by the test results,the effect of linked and dependent lift cylinder connection modes on the lift arm force was deeply researched. The comparison between two lift cylinder connection modes shows that the maximum stress of lift arm with linked lift cylinder is just within the allowable stress under limit breakout force of offset load condition.So the lift arm is liable to crack under the action of alternating load. But the dependent lift cylinder connection mode not only can avoid overloading but also can improve torsional strength.It is a useful reference for the design of the working device of loader.