董昌乐. “骨筋”特性仿生钻杆公接头断裂防掉技术[J]. 煤矿安全,2023,54(10):226−231. doi: 10.13347/j.cnki.mkaq.2023.10.031
    引用本文: 董昌乐. “骨筋”特性仿生钻杆公接头断裂防掉技术[J]. 煤矿安全,2023,54(10):226−231. doi: 10.13347/j.cnki.mkaq.2023.10.031
    DONG Changle. Falling prevention technology after outside joint breaking of bionic drill pipe with “bone tendon” characteristics[J]. Safety in Coal Mines, 2023, 54(10): 226−231. doi: 10.13347/j.cnki.mkaq.2023.10.031
    Citation: DONG Changle. Falling prevention technology after outside joint breaking of bionic drill pipe with “bone tendon” characteristics[J]. Safety in Coal Mines, 2023, 54(10): 226−231. doi: 10.13347/j.cnki.mkaq.2023.10.031

    “骨筋”特性仿生钻杆公接头断裂防掉技术

    Falling prevention technology after outside joint breaking of bionic drill pipe with “bone tendon” characteristics

    • 摘要: 针对钻探施工过程中因钻杆公接头断裂导致的掉钻问题,基于仿生学原理,以动物“骨筋”结构为仿生原形,提出了“骨筋”特性仿生公接头技术,在公接头(骨)内孔设置自锁连杆(筋),形成骨筋复合双连接单元,满足了公接头螺纹部位正常施钻时承受载荷与断裂后保持轴向连接的双重要求,实现了“打断骨头连着筋”的效果;阐述了仿生公接头的工作原理,介绍了自锁连杆设计方法,对研制的ϕ73 mm仿生钻杆进行了接头螺纹及内筋性能试验。结果表明:“骨筋”特性ϕ73 mm仿生钻杆抗扭能力达到20.12 kN·m,抗拉能力达到1 444 kN,断裂位置均位于公接头螺纹大端,接头断裂后自锁连杆仍能保持钻杆轴向连接,实现了断裂防掉功能,抗拉能力达到384 kN,满足了提钻强度需求。

       

      Abstract: In order to solve the problem of drilling falling caused by drill pipe fracture while drilling construction, taking the animal “bone tendon” structure as the bionic prototype based on the principle of bionics, the bionic drill pipe outside joint scheme with “bone tendon” characteristics is proposed. The composite double connection unit is formed by setting a self-locking connecting rod (tendon) in the inner hole of the outside joint (bone), and it meets the dual requirements of bearing load during normal drilling and maintaining axial connection after fracture, realizes the effect of “breaking bones and connecting tendons”. The working mechanism of bionic outside joint is expounded, and the design method of self-locking connecting rod is introduced, and ϕ73 mm bionic drill pipes are produced for torsion testes and tensile testes. The results show that the fracture position occurs at the large end of the outside joint when the torque reaches to 20.12 kN·m or the tension reaches to 1 444 kN. The study also demonstrates the bionic drill pipe with “bone tendon” characteristics can still maintain axial connection after fracture, and the tensile capacity after fracture exceeds 384 kN.

       

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