Aperture-adjustable bearing dismounting device and method for BB2 series pump

The invention discloses an aperture-adjustable bearing dismounting device and dismounting method for a BB2 series pump, and particularly relates to the technical field of dismounting tools, the bearing dismounting device comprises a dismounting chuck provided with an open slot and two pull rod mounting holes on a pressing plate; a pull rod can be mounted, and an adjustable high-strength double-thread screw is arranged; the top plate is provided with a pull rod connecting hole; the screw fastener is provided with a high-strength double-thread screw; and one end of the top extension mechanism can abut against the top plate, and the other end of the top extension mechanism can abut against the end face of the shaft. According to the bearing dismounting device, the dismounting chuck makes contact with the end face of the to-be-dismounted bearing for positioning, the stress area and the stress point of the to-be-dismounted bearing are increased, the to-be-dismounted bearing is stably stressed, the phenomena of dev