最近美国长年公司研制成功了一种新型的液压自动拧管机,并已成为商品。该拧管机可以卸下拧得很紧的钻杆接头。在把钻柱重新下入钻孔时,还可以对钻柱进行适当的预扭。拧管机由钻机的液压系统操作,并装有控制系统。新型自动拧管机使钻工的工作更加安全;由于 Recently the United States for many years the company successfully developed a new type of hydraulic automatic pipe threader, and has become a commodity. The pipe jacking machine can remove the screwed drill pipe joint. When drilling the drill string back into the borehole, the drill string can also be properly pre-twisted. The pipe jacking machine is operated by the hydraulic system of the drilling rig and equipped with a control system. The new automatic pipe threader makes the boring job safer; thanks