Prototype And Dyanmic Study Of Torsional Vibrated Drilling Rescue Equipment

Nowadays,more and more high-rise buildings appear in large and medium-sized cities in China with the development of economy and city construction,which results in more and more possibility of direct urban collapse due to earthquakes.In response to such a crisis,the technical requirements for developing low-disturbance rescue and rescue equipment was put forward by China Earthquake Emergency Search and Rescue Center.Therefore,this paper intends to develop a low-disturbance torsional vibration drill with thin wall based on low-noise special rescue equipment developed by our research group in early stage to process rescue or escape channels on reinforced concrete in earthquake field.The main work of this dissertation includes the following three aspectsAt First,the principle prototype of the torsional vibration drill with thin wall was completed based on the two-DOF operation platform developed by our research group.The torsional vibration is provided by two motors with eccentric masses which rotate in synchronization.The finite element analysis of key components was made and improved to meet the requirements of system operating frequency.The selection of three-phase asynchronous motor was calculated.Then,through theoretical modeling and calculation,the conditions for satisfying the self-synchronization of the dual motor are analyzed and verified with the prototype machine.It is found that the two exciter motors can synchronize when their speed is higher than a threshold value(corresponding to 30Hz).This region coincides with the operating frequency band of inertial excitation.Thirdly,simulation and experiment were conducted by multi-body dynamics analysis software ADAMS and LMS respectively.It is further confirmed that the system can provide the design requirements of the torsional vibration cutting within the working range.