Estimation of Influence Exerted by Powered Closure Stability of Elastic Valve on Efficiency of Air Hammers

In focus of the studies is the influence exerted by the radial displacement of the hammering unit on the air distribution in the air hammer with the ring-shaped elastic valve. The minimal allowable volume of the backstroke chamber at the frontmost position of the hammering unit when it contacts the anvil is calculated with regard to the limited maximum pressure in the impact stroke chamber at the moment of the blow. In the capacity of the air hammer efficiency criterion, it is suggested to use the length of the powered closure of the elastic valve, that compensates rotation of the hammering unit in the body when the radial clearance between these parts grows. The parameters of the air distribution system are estimated for all standard sizes of air hammers with the ring-shape elastic valves.