PERCUSSION DEVICE Russian patent published in 2008 - IPC E21C37/00 

FIELD: mining industry.

SUBSTANCE: said invention relates to mining industry, in particular, to devices for percussion disintegration of high-strength rock and similar materials and may be used to disintegrate rock, concrete, as well as for frozen soil ripping and filling ground compacting. Engineering problem is to improve efficiency and reliability of the percussion device. The percussion device incorporates a body with non-stationary axial knocker and a co-axial percussion tool (a rod). The bottom three-step end of the body, step size increasing in the knocker travel direction, is encircled with partially axially mobile sleeve. In the recess of the sleeve solid bottom facing the surface of the material being processed, the tool shank is secured stationary, while the sleeve inner side surface is interfaced with corresponding surfaces of the smallest upper and the largest lower steps of the body. The inner cavity of the sleeve is filled with liquid and has a cross baffle, which contacts the body bottom end in the uppermost position of the sleeve. The baffle divides the said sleeve cavity into axial top and bottom chambers, interconnected by means of a coaxial opening in the baffle; diameter of the opening is similar to the one of the knocker. At the end of the working stroke, the bottom end of the knocker enters the bottom chamber through the opening near the uppermost position of the sleeve. On the top chamber side surface, there is a coaxial collar, which encircles the smallest step of the body near the uppermost position of the sleeve and forms a wide annular slot, while near the lowermost position of the sleeve it is interfaced with the side surface of the middle step of the body, so that they together form an isolated annular space interconnected with the sleeve cavity via a narrow ring slot.

EFFECT: improved durability and reliability of the percussion device.

3 cl, 1 dwg