| 摘要 |
FIELD: construction.SUBSTANCE: pick or earth-moving tool comprises a body, a support surface, comprising a cavity and axially protruding side walls, an insert fixed in the cavity, comprising a tip, a cone-shaped front surface, a side surface and a transition edge at the crossing of front and side surfaces, and a ring arranged radially outside the protruding side walls, made of a more solid material compared to the body. The axial position of the transition edge and the axial position of the axially most front surface of side walls are substantially identical, at the same time the axially most rear surface of the insert is arranged at the axial distance L' from the insert tip, and the axially most front surface of the ring is arranged at the axial distance D' from the insert tip, where 0.5L'?D'?0.9L', preferably, 0.5L'?D'?0.8L'. The transition edge and the section of the cone-shaped front surface may be arranged inside a ballistic contour formed by the insert tip, the radially most external section of the axially most front surface of side walls and the ring.EFFECT: invention provides for operation of a tool under heavy conditions, extended service life of a tool, and reduction of tool blunting to the minimum for improved operational characteristics.13 cl, 7 dwg |
