Abstract：Due to the fact that the high pressure oil could mix together with low pressure oil under using underlapped oil distributing valves which were widely used in domestic hydraulic impactor, a study on the dynamic performance of hydraulic impactor with using overlapped oil distributing valve and the optimal neutral position type of the valve was explored. According to the operating principle of hydraulic impactor and transform principle of seam flow state, a nonlinear dynamic mathematical model was established, and combining with Stateflow to manage the state transfer of spool movement, the dynamic simulation model of hydraulic impactor was obtained. During the simulation, the impact on dynamic chamber pressure at different neutral open value was focused analyzed. To verify the theory of simulation computation, an experiment was carried out. And the result of experiment corresponded to simulation computation. All these researches laid a certain theoretical foundation to the design on optimal neutral position type of the oil distributing valve in hydraulic impact mechanism.
2014, Vol. 33 
