Rapid releasing interflow fuel-return regeneration system of main winch of rotary drilling rig

The utility model discloses the rapid releasing interflow fuel-return regeneration system of the main winch of a rotary drilling rig, which comprises a main winch motor, a brake, a main valve and a pilot handle. The pilot handle is communicated with the main valve through an oil way. A special balance valve block for the fuel-return regeneration is connected between the main winch motor and the main valve through a pipeline. The special balance valve block for the fuel-return regeneration is controlled and adjusted through a control device. Due to the adoption of the system, the efficiency is improved and the releasing speed of a main winch is accelerated. The pore-forming auxiliary operation time is reduced and the pore-forming efficiency is improved. During the releasing process of a main winch, the full-power operation of an engine is not needed due to the gravity work of the main winch itself. Only the idling operation of the engine is required, so that the fuel consumption is saved. The CO2 emission of a main machine is reduced. Brake and speed regulation control signals are provided by the pilot handle. Compared with the conventional mode that the control signals of a motor and a BVD balance valve are provided from the interior of the BVD balance valve, the system is better in controllability. Therefore, the problems of the downward-slipping and the stalling of a hoister are fundamentally solved. Meanwhile, the damage of drilling rods and drilling tools caused by the dropping of rods is effectively prevented.