compound chain
链条并车箱 compound chain box
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链传动钻机采用整体密闭式并车链条箱与变矩器统一驱动形式，在钻机搬家时无需拆装链条，可实现快速安装。
The chain drive RIGS are driven by the integral enclosed compound chain box and torque converter. During rig moves, the chains can be dismantled for ease of installation.
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