Drill pipe is attached to the far side of the reamer so that it can be pulled back from the near side, once the pre-reaming operation is complete.

扩孔器远侧与钻杆相连，当预扩孔作业完成后，可以将扩孔器从近侧拖回到远侧。

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After coke oven hole reaming at Nangang coal gas cleaning system technology of old coke oven is improved, the result shows that the system operation is stabilized.

对南钢焦炉扩孔后原焦炉煤气净化系统工艺进行了改进，系统平稳运行，取得了良好效果。

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