Abstract: A reinforcement-confined circular steel tube member with enhanced end stiffness. Two ends of a first end sleeve are respectively connected to a first end plate and a first connecting annular plate. Two ends of a second end sleeve are respectively connected to a second end plate and a second connecting annular plate. A first end of a circular steel tube passes through the first connecting annular plate to be inserted into the first end sleeve and fixed to the first end plate, and a second end of the circular steel tube sequentially passes through restraint rings and the second connecting annular plate to be inserted into the second end sleeve and fixed to the second end plate. Two ends of each steel bar are respectively provided with a first limit part and a second limit part.

Abstract: The present application provides an adjustable mandrel and a fixture. The adjustable mandrel comprises an outer-diameter adjusting assembly and a height adjusting assembly, wherein the external diameter and the height of the mandrel can be adjusted according to wheels in different specifications, the wheels in different specifications are clamped, and the radial positioning of the wheel and the axial positioning of the wheel during second-step processing are realized. Two adjusting systems supplement each other, so that the structure is novel, the concept is ingenious, the universality is high, the application range is wide, and the machining cost is reduced.

Abstract: The present application provides an adjustable mandrel and a fixture. The adjustable mandrel comprises an outer-diameter adjusting assembly and a height adjusting assembly, wherein the external diameter and the height of the mandrel can be adjusted according to wheels in different specifications, the wheels in different specifications are clamped, and the radial positioning of the wheel and the axial positioning of the wheel during second-step processing are realized. Two adjusting systems supplement each other, so that the structure is novel, the concept is ingenious, the universality is high, the application range is wide, and the machining cost is reduced.