Abstract: Aiming at the large vibration problem of the hydraulic buffer system of downward belt conveyor when it buffers the impact kinetic energy of conveyor belt, the broken belt catch hydraulic buffer system was improved and researched. The simulation models of original and improved hydraulic buffer system were built, and the dynamic performance of the buffer system was simulated by using AMESIM. The performance curves of the system before and after the improvement were compared and analyzed, and the effect of the relief valve opening pressure on improved broken belt catch hydraulic buffer system was studied. The results show that the displacement, the velocity and the pressure fluctuation of the hydraulic cylinder of the improved buffer system are obviously reduced, and the damper hole plays a better role in reducing vibration and cushioning after the relief valve closes. When the opening pressure of the relief valve increases, the displacement and the speed drop of the hydraulic cylinder increases. The smoothness of the hydraulic cylinder remains unchanged. While the pressure fluctuation of the rod less chamber of the hydraulic cylinder has a certain degree increase.
Key words: broken belt catch of hydraulic buffer system; characteristic simulation; dynamic performance; opening pressure; damper hole; relief valve