Reliability Analysis Of Transmission System Of The Internal-button Special Lifting Device

Nuclear technology has extensively researched and applied in the fields of military,scientific research and nuclear power,and the safety treatment of nuclear waste has become an urgent problem for all countries.At present,the solidification process is generally adopted in various countries,which will soon solidify the nuclear waste and then transfer it to a permanent treatment plant for permanent storage.The radioactive hazard exists in nuclear waste.The traditional hoisting process of artificial operation at close range will cause radiological injury seriously to operators.Therefore,in order to minimize the radiological injury of the nuclear waste,a set of special lifting equipment for nuclear waste which can remote control and autonomous operations is essential.In view of the above background,we designed a kind of internal-button special lifting device according to the actual structure of solidification barrel in China.Taking the internalbutton special lifting device as the research object,its self-correction centering function was simulated and analyzed,and the dynamic characteristics and reliability evaluation of its transmission system were performed.The main works are as follows:1.According to the structure of the solidification barrel,a kind of internal-button special lifting device is designed.It is a set of three-claws,synchronous rotated and retractable automatic lifting device which can realize the self-correcting and aligning function.Based on the software of ADAMS,the dynamic simulation of its self-correcting and aligning ability was carried out and the force of the claws during the correcting process were discussed in this paper.2.Studying the load output characteristics of three-phase induction motors in load,and considering the external excitation,time-varying meshing stiffness and error excitation of the system,this paper established the elastodynamic model of the transmission system adopting the centralized mass method.The angular displacements,angular velocities of the gears and the displacement of each gear along the meshing line of the gear transmission system were obtained.The modal analysis of the system was performed,and the natural frequency and principle mode shape of the system were obtained.3.Using the method of FMEA to analyze the failure of the transmission system of the internal-button special lifting device.The main failure units of the lifting device were obtained,and the main failure modes were listed.A reliability models of gear transmission systems and a reliability analysis models of gear-bearings under capacity-related conditions were established.The reliability of the drive system of the internal-button special lifting device was calculated and the reliability of the system was evaluated.4.Based on the force analysis to the claws and axis of the internal-button special lifting device from the finite element software ANSYS,the stress distribution cloud of the claws and axis during the stress process were obtained.Based on the method of Monte Carlo,this paper used ANSYS/PDS to analyze the reliability of the claws and axis,and obtained its reliability during the stress process.