Improvement and experimental study of buffer energy absorption device for mine

In order to solve the buffer problem of poor absorption effect with roadway hydraulic support,based on the structural analysis and similarity calculation method,the structure of buffer device is optimized. Through the changes of the original bayonet type structure to clamp type structure,the space taken by spring pin part is reduced,thus the space utilization of hydraulic pillar base is improved. The supporting force provided by a single rigid body is replaced by the internal foam material as the energy absorbing material combined with the rigid body to provide the supporting force. The energy absorbing effect of the two devices before and after optimization is analyzed,and three groups of experiments are carried out to verify the load change with displacement of the two devices before and after optimization.Theoretical analysis shows that the energy absorption during the opening of the clamp is 3. 9% higher than that of the original device. Energy absorption increases by 33. 3% after foam filling. The total energy absorption increases by 22. 6% ,and the energy absorption effect and buffering performance are obviously improved through data analysis. Experimental research and analysis show that the initial supporting force of the device increases significantly after optimization,and the displacement of the initial supporting force is basically at 0. 5 cm,and the fluctuation and stability can better meet the needs of the project. Energy absorption during clamp opening increases by 4. 3% . The energy absorption of foamed materials increases by 30. 5% . Total energy absorption increases by 21. 2% . In the stationary stage,the load fluctuation coefficient decreases by 9. 3% . Buffer effect impulse increases by 21. 6% . The maximum load fluctuation value decreases by more than half. After optimization,most of the shock load of the buffer device can be applied to the energy-absorbing material,and the energy-absorbing material can be easily removed and replaced. Compared with the original device,the service life of the device is increased. The rigid-flexible coupling support system is composed of energy-absorbing and buffering devices and the filling materials can effectively enhance the impact resistance of columns and reduce various losses caused by rock burst accidents to a certain extent.