Principles of Designing Air-Driven Hammer with Decoupled Piston for Driving Rods in Soil

Improvability of air-driven pulse-generating mechanisms for operation in mineral mining and construction is discussed. An impact system with two mobile masses incorporated in a common housing is proposed for vibro-percussive driving of structural iron into elastoplastic soil. Experimental prototype of the air hammer with decoupled piston based on the air distribution circuit with elastic valve in the back stroke chamber of the piston is described. The test data of operation cycle of the piston in case of different variants of settings are presented. The possibility to exert influence on the nature and frequency of impacts is demonstrated.