按天球上的小圆弧逼近卫星视轨迹实现跟踪照相的仪器有四根转轴Ⅰ轴是垂直轴Ⅱ轴是水平轴Ⅲ轴指向逼近视轨迹的小圆弧的极点称为轨道极轴Ⅳ轴按小圆弧的纬度调置常称轨道纬轴照相机绕Ⅲ轴旋转对卫星跟踪
筒体与轴两端的相连处装有四重轴端密封装置。
Two ends of the mixing axis that articulates with the mixing silo are loaded quadruple axle end seal device.
当三、四通溜子水平放置运输时传动装置及传动部位应悬空，以防止传动轴受力过大导致变形损坏。
Transmission device and part should be hung up when the valve is in horizontal in order to prevent damage of driving axle.
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