Active matrix bit modulating

The present invention is a composite driving adjustment drill, the drill body is provided with a drilling fluid passage; end of the bit body is provided with a plurality of axially projecting portions spaced uniformly along its circumference; teeth fixedly provided on the projecting portion wheel; knife plurality of wings disposed between the roller, the axial central portion of the knife blade is fixedly connected with a hollow guide rod, the guide rod axially disposed in the hollow body and the drill bit with the drilling fluid conducting channel; hollow guide by a control rod driving apparatus is fixed to the body of the drill bit body or reciprocate in the axial direction, is provided between the hollow guide rod linkage with the bit body. The composite active adjustment without requiring a complete drill from the drill by actively adjusting the amount of PDC drill bits and rock breaking cone bits allocated to meet the requirements of different drilling the formation; suitable formations, PDC bits may be used alone or cone bit, give full play to the advantages of roller cone bits and PDC bits, and lithology to adapt, thus greatly improving drilling speed, increase the service life.