另有一些极板需要使用连接装置才能和下井仪器相连，测井时需要使用推靠臂才能紧贴井壁。
Others have articulated joints attaching them to the logging tool, with a backup arm to press the pad against the borehole wall.
本发明公开了一种八臂机械推靠器，包括：电动机、离合器、滚柱丝杠、 传动部件、推靠臂；
The invention discloses a mechanical eccentering arm with eight arms including a motor, a clutch, a roller threaded spindle, drive parts and an eccentering arm;
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