... block， pulley 滑车组 chain block pulley 链滑轮 Block，differential pulley 差动滑轮组 ...
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chain pulley block 链滑轮组
electric chain pulley block 电动葫芦
hand chain pulley block 手拉葫芦
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Steel column is fixed to special jig, slipping below the installation position by chain block and lifting by pulley block and windlass.
将钢骨柱固定在专用胎架上，通过倒链滑移至安装点下方后，采用滑轮组和卷扬机进行提升就位。
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