Fatigue Life Analysis Of Vortex Spring And Its Application

Friction Reversing Type Oil Pumping Unit is a new kind of oil pumping system. Because of frequently reversing of the friction wheel, just at the moment as friction wheel changes rotational direction, relatively large acceleration and heavy load will appear, and therefore exist the great impact in the whole pumping system. The power required is thus increased and the motor will have to work under unstable status. If motor with less power is selected, regular overload will often happen. On the contrary, loss of power will be resulted, In such kind of machinery, every component or part such as oil extraction rod, pin gear bearing in the axle of the reduction gear, steel wire rope, etc, will be under the influence of impact. We expect that the power fluctuating magnitude of the motor can be decreased, the loaded situation in system be improved, energy consumption be reduced, and then the whole work system service life be enhanced. This is an important research topic which will determine the future development of Friction Reversing Type Oil Pumping Unit.A buffer is placed between the dynamic shaft and friction wheel, which may be a very good method to solve the problem. With this idea, between the output axle of reducer and the rub wheels a vortex spring is added. Through theoretical analysis and experiment, it is shown that the sudden change of speed and impact in the pumping system is effectively lightened during positive and negative reversion of the friction wheel. System life is enhanced and the energy conservation has been reduced obviously.As a key part of the buffer, the vortex spring will affect buffing result directly and therefore, the elevator service life will be determined by its performance. In order to guarantee the reliability of vortex spring, the fatigue life of the vortex spring is analyzed in this paper.According to the state analysis of the Friction Reversing Type Oil Pumping Unit, the geometry parameter of the vortex spring is calculated in this paper at first. With the 3-D modeling software UG, the three-dimensional entity model of the vortex spring is set up. Secondly, through the IGES transformation filter that is in the large-scale finite element analysis software ANSYS, the model of the vortex spring entity is transferred into ANSYS software.Stress-strain analysis is carried out for the vortex spring. Finally, according to the analysis result, at the most dangerous point where the biggest stress appears, the fatigue life is analyzed. The traditional theory of the spring is verified according to above-mentioned analysis results. The theoretical foundation for further optimization is thus offered.With the Friction Reversing Type Oil Pumping Unit being constantly perfected, the application will be widened. The pre-research work done here will provide powerful support for the application.