Safe and convenient maintenance device for oil cylinder of wheel brake of quayside container crane

The utility model discloses a safe and convenient shoreside container crane wheel brake oil cylinder maintenance device which comprises an outer expansion sleeve and an inner expansion sleeve, the outer expansion sleeve and the inner expansion sleeve are installed together through a first locking bolt, a mounting hole is formed in the radial side surface of the outer expansion sleeve, and the inner expansion sleeve is connected with the outer expansion sleeve through a second locking bolt. A threaded hole is formed in the radial side surface of the inner expansion sleeve, a second locking bolt is installed in the installation hole, the surface of the second locking bolt is matched with the threaded hole in a locking mode, the inner side surface of the outer expansion sleeve is connected with a brake oil cylinder in a sleeved mode, and a frame is arranged on the right side of the brake oil cylinder. By means of the structure, the inner expansion sleeve is arranged to be matched with the outer expansion sleeve,