Variable-wheelbase tracked vehicle for hoisting water pump and drainage method of variable-wheelbase tracked vehicle

The invention belongs to the technical field of mine permeable emergency drainage and discloses a variable-wheelbase crawler for hoisting a water pump and a drainage method of the variable-wheelbase crawler. The variable-wheelbase crawler comprises a frame (3), wherein two auxiliary supporting legs (6) capable of transversely extending are arranged on each of the two sides of the frame (3), a crawler walking mechanism (1) is fixedly arranged at the bottoms of the auxiliary supporting legs (6), supporting legs (2) capable of vertically extending and retracting are arranged at four corners of the frame (3), a water pump hoisting mechanism (4) is arranged in the center of the frame (3), and the water pump hoisting mechanism (4) is used for hoisting the water pump. By arranging a transverse adjusting oil cylinder, a distance between the crawler belts can be adjusted, different track requirements are met, the crawler can stably walk in an underground coal mine and is suitable for inclined roadways, and by hoisting