Research on Application of Piston Accumulator on Ultra Large Hydraulic Pile Hammer
As an auxiliary power source for compensating the peak flow rate of hydraulic pile hammers,piston type accumulators have a significant impact on the dynamic characteristics of hydraulic pile hammers.In order to optimize the dynamic characteristics of hydraulic pile hammers,the working principle of double acting hydraulic pile hammers is analyzed,and the basis for selecting the type of accumulator is elaborated.Theoretical analysis is conducted on the calculation of accumulator volume and inflation pressure parameters.Aiming at the characteristics of significant dynamic changes in flow and pressure during the impact process of hydraulic pile hammers,as well as non-linear coupling of flow and pressure,a simulation model of hydraulic pile hammers is established based on the AMESim software platform.Based on the relevant data of 4400 kJ ultra large hydraulic pile hammers,simulation parameters are determined to study the influence of charging pressures of 18 and 14 MPa on the dynamic characteristics of hammer core displacement,velocity,acceleration,etc.The simulation results show that under the condition of charging pressure of 18 MPa,the peak flow rate of the rodless chamber of the hydraulic cylinder is insufficient during the striking process,with a maximum striking speed of 5.5 m/s and a maximum striking acceleration of 14.1 m/s2;When the charging pressure of the accumulator is reduced to 14 MPa,there is no insufficient oil supply in the rodless chamber during the striking process,the maximum striking speed is 6 m/s,and the maximum striking acceleration is 14.2 m/s2,achieving a control effect of fast hitting speed and good system stability.
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