Diameter-adjustable blind hole bushing dismounting tool and use method

The invention belongs to the technical field of mechanical assembling and disassembling, and discloses a diameter-adjustable blind hole bush disassembling tool and a using method.The disassembling tool comprises a pull rod shaft, a maintaining body and a sliding block, the axial lower half portion of the pull rod shaft is a cone, the upper portion of the cone is an external thread face, and the maintaining body is provided with a vertically-through through hole; the upper half part of the through hole of the retaining body is an internal threaded hole matched with the external threaded surface of the pull rod shaft, the lower half part of the through hole of the retaining body is an internal conical surface matched with the cone of the pull rod shaft, the retaining body is provided with at least two horizontal and symmetrically distributed transverse holes which penetrate through the side surface of the retaining body and the through hole of the retaining body, and the transverse holes are positioned at or be