Variable-diameter universal wrench for steel structure construction

The utility model relates to the technical field of construction equipment. The utility model discloses a variable-diameter universal wrench for steel structure construction. Including a sleeve, a lantern ring is movably connected to the interior of the sleeve; a through hole is formed in the sleeve; a movable rod is movably connected to the interior of the through hole; a mounting plate is fixedly connected to the position, corresponding to the through hole, of the inner surface of the sleeve; a spring is fixedly connected to one side, far away from the sleeve, of the mounting plate; the sides, away from the mounting plate, of the springs are fixedly connected with movable plates; one end, close to the lantern ring, of the movable plate penetrates through and extends into the sleeve; theouter surface of the movable rod is fixedly connected with a movable plate, a fixing hole is formed in the position, corresponding to the movable rod, of the outer surface of the lantern ring, the movable rod is located in th