Tightening device for case and vacuum brazing case thereof

The utility model provides a fastening device for a case and a vacuum brazing case thereof, and relates to the technical field of case structures. The front fastening device comprises a positioning steel sleeve which is arranged on the side wall of the case; the fastening pin is cylindrical and is arranged on the case mounting frame; the case is locked and fixed to the case mounting frame through cooperation of the fastening pin and the positioning steel sleeve; weld joints of the left guide rail plate, the front enclosure frame, the right guide rail plate and the rear wall plate for the brazing case are fold-line-shaped surfaces, the weld joints are avoided in a main force transmission route, and the mechanical test reliability of the case can be improved. The cylindrical rear fastening pin is in cylindrical surface contact, so that the problem that an avionics case cannot be locked due to a gap existing after a traditional case positioning steel sleeve and a conical rear fastening pin are in contact and are