由长沙矿山研究院、凡口铅锌矿、嘉兴冶金机械厂研制的 AT2000型天井钻机是我国第一台直径达2m 的天井钻机,它适用于地下矿山和其它工程的硬、中硬岩层中钻进(?)250mm 的孔和扩(?)2～3m 的通风井、充填井、人行井、下料井及其它措施井等。还可在深孔爆破掘进大断面天井或竖井中打掏槽孔。 The AT2000 drilling rig developed by Changsha Research Institute of Minerals, Fankou Lead-Zinc Mine and Jiaxing Metallurgical Machinery Factory is the first well drilling rig in China with a diameter of 2m. It is suitable for drilling hard and medium hard rock formations in underground mines and other projects (?) 250mm hole and expansion (?) 2 ~ 3m of the ventilation wells, filling wells, pedestrian wells, unloading wells and other measures well and so on. But also in the deep-hole blasting excavation of large sections of the shaft or shaft cut holes.