annular pack off 环形封隔
Action is to be used pin annular slideway C, make its and groove D photograph cooperate, prevent shuttle to wear from shuttle fall off inside housing;
作用一是用来压住环形导轨C，使其与凹槽D相配合，防止梭架从梭壳内脱落；
The axial magnetic force increases with the increment of magnetic annular axial length and decreases with the increment of axial gap, radial off-centre or magnetic annular relative permeability.
轴向磁力增加与增量磁性环形轴向长度和与轴向间隙，径向偏离中心或磁性环形的相对磁导率的增量减少。
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