PDC (Polycrystalline Diamond Compact) drill bit with movable partial blades

The invention discloses a PDC drill bit with movable partial blades. The PDC drill bit comprises a drill bit body, the fixed blades, the movable blades, a power conversion mechanism and a transmission mechanism. The power conversion mechanism can adopt an impeller driving type mechanism, a screw motor driving type mechanism or a motor driving type mechanism; the transmission mechanism comprises a cam rod, a push rod, a spring, a rotating pin shaft and a fixed pin shaft, fixed blades and movable blades are arranged on the drill bit body, PDC teeth are arranged on each blade, and the movable blades can achieve periodic telescopic movement under the action of the transmission mechanism and can be overlapped with rotating cutting movement to form combined movement. The cutting path of the PDC teeth on the blade under the combined motion is not a circular track but a periodic non-circular track, and the rock ridge generated after cutting of the PDC teeth on the fixed blade can be efficiently crushed. The drilling