In order to adapt the need of loading and unloading drill rod of iron gate-opening machine for large-scale blast furnace, the new change rock drill machine is designed.
为适应大型高炉开铁口机的装卸钎杆需要，设计开发了新型换钎机。
In order to adapt the need of loading and unloading drill rod of iron gate-opening machine for large-scale blast furnace, the new change rock drill machine is designed.
为适应大型高炉开铁口机的装卸钎杆需要，设计开发了新型换钎机。
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