Adjustable half joint

The utility model discloses an adjustable Haff joint, which belongs to the technical field of Haff joints and comprises a Haff joint body, the Haff joint body comprises two half shells, two adjusting shells and two groups of adjusting mechanisms, the outer surface of one side of each half shell is movably connected with two adjusting shells, each group of adjusting mechanisms comprises a rotating shaft, one end of each rotating shaft is sleeved with a gear, and the other end of each rotating shaft is sleeved with a gear. Toothed plates are fixedly connected to the outer surfaces of one sides of the two adjusting shells and located on one sides of the gears, toothed plates are fixedly connected to the outer surfaces of one sides of the other two adjusting shells and located on the other sides of the gears, and each toothed plate is meshed with the corresponding gear. And by rotating a gear in the adjusting structure, the gear drives the toothed plates on the two sides to move corresponding to one side, so that