Drilling machine for drilling hard surface, has nozzles mounted on supporting assembly and generating pressurized liquid jets towards working space between action zones of drilling tools for disintegrating transom in space

摘要

The machine has a pair of rotating drilling tools rotating around a same rotation axis, and a supporting assembly (32) integrated with a chassis for supporting the tools and having an edge (32a) extending between the tools. Nozzles (54) mounted on the assembly generate pressurized liquid jets (56) towards a working space between action zones of the tools for disintegrating a transom formed in the space.