IMT, MAIT lock type Kelly bar, Full interlocking kelly bar

Full-interlocking Kelly bar

全锁扣加压钻杆

Full-interlocking Kelly bar is composed of three weld-on ribs with continuous concave and convex keys (see chart) During the drilling process, the downward thrust is transmitted to drill bucket directly by rotation power of Rotary head inner ribs and Kelly bar outer ribs at any time . This type of Kelly bar is the best one of transferring pressure at present , especially for hard ground and frozen oil layer construction. In the drilling process , every continuous steps can form pressure point to reduce wear and tear of local pressurization key lines, also to avoid the stick problem that Kelly pipe is deformation always in a part pressurization. When drilling progress, driving the inner convex concave tooth key and the outer convex concave tooth key uniformly forms good engagement, the advantage is force uniform, not easy to stick pipe, particularly to improve work efficiency . It has gotten high praise from home and abroad rotary rig user.
This type Kelly bar has applied for patent, the patent No. is 201420542679.2.

全锁扣加压钻杆是由三组带凹凸齿的键条等分组合而成（见图所示）。

全锁扣加压钻杆在钻孔过程中动力头旋转的内键与钻杆外键可以随时随处形成锁扣加压，直接将动力头上的加压力通过钻杆的凹凸齿直接全力传送到钻头上，目前这种钻杆传递加压力是最好的, 特别是对坚硬的地层及冻土层的施工。

在钻进过程中对钻杆每个部位都可以形成加压点，减少对始终局部受加压齿键条的磨损，也避免了钻杆始终在某一部位加压易造成管壁变形卡钻的难点，用时驱动内键均布的凹凸齿键与外凹凸齿键形成良好的啮合，在加压的部位形成多点加压，受力均布稳定不易卡钻，尤为提高工作效率，从而得到很多旋挖用户的好评。

该钻杆已申请专利，专利号：201420542679.2

New High -efficency Full-Interlocking Kelly Bar

New High -efficency Full-Interlocking Kelly Bar

 新型高效全锁扣钻杆

New High -efficency Full-Interlocking Kelly Bar is composed of interlocking Kelly bar and full interlocking  Kelly bar. It’s our leading procucts.

The first section is ordinary interlocking type,internal keys of inner sections are composed of three groups of pressure stage. The outer keys are consisted of  three- piece of three group of concave - convex pressure stage.

This type kelly bar is based on domestic rig configuration and condition demand, combined with the home and abroad advanced manufacture technology, supporting domestic and foreign rotary piling rig.Adope high-strength alloy steel and wear-resistant alloy strip,take special process to the pressure point,kelly box head ,stop ring and other wearing spares,to make sure the durability and reliability of kelly bars.This kind of kelly bar is especially suitable for hard layer,frozen layer,pebble layer.With the advantage of large downward transmission pressure ,small pressure loss,fast transmission speed.

This type Kelly bar has applied for patent, the patent No. is 201420542676.9

新型高效全锁扣钻杆 是由普通机锁钻杆与全锁扣钻杆组合简化合成,为我公司的主打产品。

该钻杆第一节为普通机锁钻杆形式，里面几节内键是由三组加压台阶组成，外键由三段三组凹凸形式的加压台阶组成。

新型高效全锁扣钻杆 是根据国内钻机配置需要和工况需求，结合国外钻杆的加工设计工艺制造，配套于国内外各种大型旋挖钻机。该钻杆采用高强合金管材，耐磨合金键条，并对加压点，方头，挡环等易损件作特殊工艺处理，确保钻杆的可靠性和使用性。该钻杆适合于坚硬的岩石底层，冻土层，鹅软石层，钻杆的向下传递加压力大，压力损失小且传递速度快。

该钻杆已申请专利，专利号：201420542676.9  （新型高效耐用机锁钻杆）