PERCUSSIVE ACTION DEVICE (VERSIONS) Russian patent published in 2018 - IPC E02D7/08 E21B1/38 E21B4/14 

FIELD: mining.

SUBSTANCE: percussive action device comprises a body with a branch pipe and inlet and exhaust hole/holes, a movable hammer installed in the body, forward and return stroke chambers, a guide element for hammer, a through channel in the hammer for communicating chambers of forward and return stroke, a shut-off valve. An annular groove is made on the outer surface of the hammer in the front part thereof. The body contains an anvil, on the inner surface of which there are a front annular projection and a limiter of the return stroke of the hammer. The shut-off valve is made in the form of an elastic ring installed in said annular groove of the hammer with the possibility of interaction with the inner surface of the body. The limiter of return stroke of the hammer is made in form of recesses on the inner surface of the body, and the surface of the front annular projection is made spherical or conical, the elastic ring is rectangular or round in cross-section. The guide element for the hammer is made in the form of an annular row of projections on the inner surface of the body or on the outer surface of the hammer. The device has an additional chamber of direct stroke, an additional shut-off valve, an additional annular groove, a rear annular projection provided on the inner surface of the rear part of the body. According to the first version, exhaust hole/holes are in the rear side part of the body. The device has the isolation valve made in form of elastic ring, the annular stepped groove in the branch pipe, hole/holes in the branch pipe. The isolation valve is installed in the annular stepped groove in the rear part of the direct stroke chamber with the possibility of interaction with the outer surface of the elastic ring with the inner surface of the branch pipe, and hole/holes in the branch pipe are located in its end projection for communication of direct stroke chamber with the additional direct stroke chamber. According to the second version, the device has additional exhaust hole/holes in the front side of the body, and the guide element for the hammer is made in form of annular projection on the outer surface of the hammer or on the inner surface of the body. The device has the isolation valve made in form of elastic ring, the annular stepped groove in the branch pipe, hole/holes in the branch pipe. At that, the isolation valve is installed in the annular stepped groove in the rear part of the direct stroke chamber with the possibility of interaction with the outer surface of the elastic ring with the inner surface of the branch pipe, and hole/holes in the branch pipe are located in its end projection for communication of direct stroke chamber with the additional direct stroke chamber.

EFFECT: improved device reliability.

2 cl, 3 dwg