| 摘要 |
The invention relates to bore-hole technology.The technical result of the invention is to provide contact interaction of a double cone bore bits forming a support surface therebetween, creating pressure rises of washer fluid inside the tool, using thereof as an axial load and feeding mud flow beneath matrix sectors.The rock-breaking drilling tool comprises outer and removable inner bits, matrices casings and flushing courses, the inner part of the outer bit is designed as vertically-coaxial cones interacting with response cones of the lower part of the inner bit casing thus forming a support surface therebetween, the outer bit matrix is made staged and divided into sectors, the flushing courses of the outer bit are positioned horizontally below the matrix upper step.The inner bit casing has a longitudinal axial chamber with staged shoulders, wherein the chamber is oriented by its radial channels for corresponding upper and lower stages of the outer bit matrix.A cavity is made in the lower part of the longitudinal axial chamber transforming into the matrix with spreading therefrom flushing courses of the inner bit and passing into a concentric recess in the matrix upper part associated with the matrix lower stage slots of the outer bit. |
