IMPACT ACTION DEVICE Russian patent published in 2013 - IPC E21C37/00 

FIELD: mining.

SUBSTANCE: in the proposed device a hammer is made in the form of a cylindrical rod with a striker fixed on the lower end and a piston ledge on its upper part arranged in the isolated cavity of the body, partially filled with a working fluid. In the inner axial cavity of the hammer there is a closed cylindrical bore arranged, which with the coupled piston and stem, the end of which is fixed on the upper cover of the specified isolated cavity of the body, form a driving hydraulic cylinder, the piston cavity of which via the axial channel in the stem is continuously communicated with a drain line; at the same time the stem cavity of the hydraulic cylinder via a parallel channel in the stem and a hydraulic distributor alternately communicates with a discharge or a drainage line. The lower part of the isolated cavity of the body is made in the form of a truncated cone, the diameter of the lower smaller base of which is substantially equal to the diameter of the piston ledge of the hammer. Along the cylindrical wall of the isolated cavity of the body there are contactless sensors, on which the piston ledge of the hammer acts, causing switching of the hydraulic distributor. Application of the proposed invention will make it possible to increase efficiency of operation of an impact action device and to reduce its dimensions.

EFFECT: hydraulic hammer is simple in design, all rubbing parts are protected against dust and dirt, which makes it possible to increase its service life.

3 cl, 1 dwg