Truss Robot Reliability Analysis And Design

The truss robot is the key equipment of the auto line drive shaft drive shaft for the constant speed drive of the car and is responsible for the loading and unloading of several CNC machine tools.The reliability of the truss robot is related to the operation of the automatic line.The reliability analysis of the truss robot is performed,and the weak links are discovered.The redesign is carried out to improve not only the reliability of the truss robot itself,but also an effective measure for improving the performance of the auto line of the isometric drive shaft of the automobile.The main research contents of this article are as follows:(1)Using the FMECA method to model the reliability of the truss robot system,the FMEA table was obtained,the failure was analyzed using the grey correlation method,and the faults of the horizontal servo motor,the failure of the rack and pinion,and the failure of the linear guide were found.The ones that are the most harmful to system reliability and analyze them one by one.In-depth analysis of the cause of the failure,and gives improvement measures;(2)Based on the reliability analysis of the truss robot,the truss robot is improved from three aspects: improvement of mechanical structure,improvement of control system and safety design.Mechanical structure re-engineered the manipulator program;using the Shape Finder module in ANSYS Workbench to lightweight the cross-seat design;re-arrange the structure to reduce the load received by the beam;combined with the commonly used anti-backlash device,proposed The clearance between rack and pinion gears is eliminated;the beam with different cross sections is analyzed using ANSYS statics simulation.The improvement of the control system mainly improved the main program of the control system and reselected the servo motor.Three points are put forward in the safety design.The system safety control circuit of the system is designed.The redundant technology is used to add sensors.Finally,safety protection measures are proposed.(3)Monte-carlo method is used to carry out reliability simulation of truss robots.Monte-carlo simulation model is firstly established.Sampling methods that accord with this system are selected.The simulation algorithm is designed and the appropriate simulation parameters are selected by trial operation.Using Matlab to draw the reliability curve,the simulation calculation calculates the average time between failures of the system,and gives the importance of each event.