Increasing energy efficiency of hydraulic hammers used for secondary breaking based on the geometry effect of the impactor parts

This article presents the results of theoretical and experimental studies aimed at the practical implementation of the possibility to account for the effect of the geometry of the impactor assembly when choosing rational design parameters of hydraulic hammers. The research was carried out using a test bench based on the principle of an impact tension machine. The test bench was manufactured at the Department of Mechanical Engineering of the Empress Catherine II Saint Petersburg Mining University. It is shown that the anvil blocks made in the form of revolved solids of an exponential curve, a tractrix and a hyperbola can reduce the amount of impact energy by more than 50%. A method for embedding anvil blocks with a curved side surface into the hydraulic hammer housings is presented and justified, provided that the impact pulse parameters are maintained consistent with the properties of the rock being disintegrated. The results of the research have made it possible to justify a new design of the anvil block, which helps to increase the energy efficiency of hydraulic hammers used for disintegration of highstrength rocks.