Engineering driller machine-liquid composite power transmission device and control method thereof

The invention belongs to the technical field of engineering drills, and discloses an engineering driller mechanical-hydraulic hybrid power transmission device and a control method thereof, and the engineering driller mechanical-hydraulic hybrid power transmission device comprises an engine, a mechanical transmission flow and a hydraulic transmission flow; an output shaft of the engine is provided with a small belt wheel and is connected to the double pump through a coupling, so that one-driving-two starting of the engine is realized, and the output power of the engine is maximized; the mechanical transmission flow comprises a transmission mechanism of a belt transmission mechanism, a three-jaw chuck, a speed change gear box, a first reversing gear box, a second reversing gear box, a mast gear box and a power head gear box; the hydraulic transmission flow is used for supplying liquid to an executing mechanism of the drilling machine through hydraulic energy output by the double pump. The mechanical transmissio