Device for disassembling and assembling nut in shaft neck disc cavity of aero-engine rotor

The invention belongs to the technical field of dismounting and mounting of nuts in shaft neck disc cavities of rotors of aero-engines, and particularly relates to a dismounting and mounting device for nuts in shaft neck disc cavities of rotors of aero-engines. A transmission system is formed by a first driving rod, a first connecting rod, a first torque transmission rod, a second driving rod, a second connecting rod, a second torque transmission rod and first to seventeenth bevel gears, four wrenching shafts and torque transmission arms are driven to rotate at the same time, and four nuts connected with a rotor shaft neck and a rotor drum are screwed at the same time through four wrenching heads. Therefore, synchronous disassembly and assembly of a plurality of nuts in a plurality of aero-engine rotor journal disc cavities are achieved, convenience and rapidness are achieved, when the nuts are tightened, pre-tightening force at all positions can be uniform, and large local deformation of a rotor drum and a r