To overcome these problems, a facile pipe external aligning device was made using the old car wheel hubs of an automobile.It satisfies the construction needs.

• 针对以上存在的问题,结合实际,研制出了利用汽车旧轮毂制作的简易外对口器,克服了购置外对口器存在的不足,满足了施工需求。