美国罗宾斯公司于1978年生产了Robbins 121BR型,1979年生产了Robbins 80 BR型两种竖井一反井两用钻机。由于竖井结构复杂、笨重,而反井钻机本来就是为井下钻进用,一般不适用于地面钻进条件。因此,罗宾斯公司在天井钻机结构基础上,采用了竖井钻机所采用的排渣方式,研制了既能钻进竖井,又能钻进天井的两用钻机。这种钻机结构紧凑,扭矩大,重量轻,机动性 The Robbins 121BR model was produced by Robbins in the USA in 1978 and two shaft-one dual-purpose rigs in the Robbins 80 BR model in 1979. As the shaft structure is complex and cumbersome, while the anti-well drilling machine is originally used for underground drilling, generally not suitable for ground drilling conditions. Therefore, on the basis of the structure of the boring machine, Robins adopted the slag-discharging method adopted by the shaft drilling machine and developed the dual-purpose drilling machine which can drill into the shaft and into the well. This rig has a compact structure, large torque, light weight and mobility