PDC drill bit pulse impact device and method

The invention discloses a PDC drill bit pulse impact device and method. The impact device is mainly composed of a bypass valve shell, a filter plate, a bypass valve element, a bypass valve spring, a bypass valve sleeve, an elastic check ring, an anti-falling lock nut, an anti-falling connecting rod, a screw outer barrel, a rubber bushing stator, a screw rotor movable hinge, a ball seat, a locking sleeve, a universal shaft connecting rod, a universal shaft outer barrel, a sealing sleeve, a transmission ball, a pressure bearing ball, a thrust bearing, a transmission shaft, a driving ball head, a sliding reciprocating shaft, a power conversion outer barrel, a plunger seat, a one-way valve body, a one-way valve sleeve, a one-way valve element and a one-way valve spring, wherein a convex wing in clearance fit with an axial groove is arranged on the sliding reciprocating shaft, the periodic change of the axial position of the driving ball head enables the sliding reciprocating shaft to generate periodic axial movem