Xie Miao, Meng Qingshuang, Zhang Wenzhuo, Wang He, Guo Jianfeng, Liu Yuan, Yan Wenxing, Li Bo
School of Mechanical Engineering, Liaoning University of Engineering and Technology, Fuxin, 123000, China.
Aerospace Heavy Engineering Equipment Co., Ltd, Wuhan, 430000, China.
Sci Rep. 2023 Oct 23;13(1):18078. doi: 10.1038/s41598-023-45329-3.
The cutting process of the cantilever tunneling machine mainly generates excitation through the cutting motor or the hydraulic cylinder driven by the hydraulic system. Regardless of the driving method, the frequency width of the excitation system is limited, difficult to control, and the excitation effect is poor. Therefore, in order to improve excavation efficiency, the excitation system parallel to the original cutting and rotating system is designed. Based on the excitation characteristics caused by alternating fluid flow, the core component of the excitation system, hydraulic exciter, is designed, and the dynamics and dynamic characteristics of the excitation system are analyzed. Based on AMESim software, analyze the impact of factors such as pump displacement, excitation frequency, and pipeline parameters on the operational performance of the electro-hydraulic vibration cutting system, and conduct experimental verification by building a cutting test bench. The experimental results show that as the inner diameter of the pipeline increases, the fluctuation at the acceleration turning point decreases in each cycle and approaches the peak faster. As the excitation frequency increases, the cutting acceleration of the electro-hydraulic excitation cutting system decreases first and then increases, verifying the accuracy of the simulation results. In the experiment, it was found that the acceleration transformation range of the cutting head of the excitation system is the smallest and most stable when the excitation frequency is 30 Hz. In order to verify that the excitation frequency of 30 Hz is the optimal frequency, further contact force tests were conducted on the cutting teeth. It was found that when the hydraulic excitation system adds a 30 Hz excitation frequency, the contact force on the cutting teeth is the smallest. It is more conducive to reducing the damage and wear of the cutting head, and the cutting effect of the cutting head is more obvious. The research results are beneficial for improving the cutting performance of the electro-hydraulic excitation cutting system, providing theoretical support for the selection of cutting parameters for excavation machinery and hydraulic excitation, and improving the existing theoretical system for active excitation cutting vibration analysis of excavation machines.
悬臂式掘进机的切割过程主要通过切割电机或由液压系统驱动的液压缸产生激励。无论驱动方式如何，激励系统的频率宽度有限，难以控制，且激励效果不佳。因此，为了提高挖掘效率，设计了与原切割旋转系统并联的激励系统。基于交变流体流动引起的激励特性，设计了激励系统的核心部件液压激振器，并对激励系统的动力学及动态特性进行了分析。基于AMESim软件，分析泵排量、激励频率和管道参数等因素对电液振动切割系统运行性能的影响，并通过搭建切割试验台进行实验验证。实验结果表明，随着管道内径的增大，每个周期内加速度转折点处的波动减小，且更快地接近峰值。随着激励频率的增加，电液激励切割系统的切割加速度先减小后增大，验证了仿真结果的准确性。实验发现，当激励频率为30Hz时，激励系统切割头的加速度变化范围最小且最稳定。为了验证30Hz的激励频率是最优频率，对切割齿进行了进一步的接触力测试。发现当液压激励系统添加30Hz的激励频率时，切割齿上的接触力最小。更有利于减少切割头的损伤和磨损，切割头的切割效果更明显。研究结果有利于提高电液激励切割系统的切割性能，为挖掘机械的切割参数选择及液压激励提供理论支持，完善现有挖掘机械主动激励切割振动分析的理论体系。
