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Problems Prone To Occur When Using DTH Drill Pipe

Update:01-07-2021
Abstract:  Down-the-hole drilling rigs are often used to excavate rocks. The rock itself is very solid and its appearance is very...

  Down-the-hole drilling rigs are often used to excavate rocks. The rock itself is very solid and its appearance is very smooth. Often due to the condition of the rock itself, the drilling rig runs and gets stuck. How should we prevent this?

  Because the diameter of the drill bit and impactor assembly is larger than the diameter of the DTH drill pipe, and the length is longer, the drill bit is far from the drill holder, and the DTH drill pipe has a certain elasticity, so it is excavated on irregular rocks. The phenomenon of "running drilling" is very easy to occur at times, that is, the rock hole is off the axis of the drilling rig. In this case, if you continue to drill, the DTH drill pipe will bend, or even a "don't drill" phenomenon will occur, which will cause the drill to fail to work and cause serious harm to the drill itself. To solve this problem, we conducted a serious study based on the working principle of the drilling rig and planned a drilling bucket supporting locator to install it on the two legs of the front end of the drilling rig. It is proved through use that the positioning effect is excellent so that the phenomenon of "running drill" has been well solved.

  When the rock is relatively broken, no matter what angle is used for drilling, the "jamming" phenomenon will be more serious, especially when the drill is being lifted, the "jamming" phenomenon is more likely to occur. In severe cases, it will take a few days to withdraw the drill bit, which will have a serious impact on the construction. Because the diameter of the DTH drill pipe is smaller than the diameter of the drill bit and impactor assembly, the gravel drilled into the hole wall will make room after the hole is drilled, and they will collapse under the effect of vibration and gravity. Come and sink to the bottom of the hole. When the drill is lifted, or the drill bit moves upward, it will drive the gravel to move back together. As the drilling interval increases, the gravel moves back together. With the increase of the drilling interval, the accumulation of gravel will increase, and at the same time, under the effect of the tapered surface of the adapter rod, an increasing squeezing force will cause the drill bit to be stuck in the hole. If the conical surface of the connecting rod between the impactor and the DTH drill pipe is inlaid with cemented carbide blocks, and they are scattered and scattered so that the lifting force and reversal torque of the drill will be used to crush the stone when the drill is lifted. Shearing and honing make it into rock dust to complete reverse drilling. In this way, the drill can be lifted smoothly, and the abrasion of the impact shell from the gravel can be reduced, and the service life of the impactor can be prolonged by more than 2 times.