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输油臂是用在码头上,将油船里的石油抽上来,通过管道注入油槽车、贮油罐等容器内的机具。输油臂上的回转接头是在弯曲的输油管道间(其轴线不在同一平面上),焊接几只滚珠轴承,其外圈与油管的一端焊接,其内圈与油管的另一端焊接,这样,输油管道就可以
Oil delivery arm is used in the dock, the oil in the tanker pumping up, through the pipeline into the tanker, storage tanks and other containers within the machine. The swivel joint on the oil delivery arm is to weld several ball bearings between curved pipelines whose axes are not on the same plane. The outer ring is welded with one end of the oil pipe and the inner ring is welded with the other end of the oil pipe. Oil pipeline can be