Core sectional rod and rotary drilling rig drilling rod including same

Abstract

The invention provides a core section rod. The core section rod comprises a core section rod pipe body and a drilling tool connector arranged under the core section rod pipe body, wherein the drilling tool connector comprises a rectangular head portion, a connection portion and a boss portion located between the rectangular head portion and the connection portion; the boss portion is clamped between a bearing plate and a spring stop; the spring stop is connected with the core section rod pipe body and connected with the bearing plate through multiple driving keys. According to the core sectional rod, the connection mode of welding the drilling tool connector to the core section rod pipe body directly is changed, and the forced structure of the drilling tool connector is changed through the clamping of the boss portion of the drilling tool connector between the spring stop and the bearing plate. Accordingly, the forced pressure can reach the bearing plate position of the drilling tool connector without passing the wear area of the drilling tool connector and torque is also divided into two directions, so that the failure rate of a drilling rod is reduced and the service life of the drilling rod is prolonged. Moreover, a rotary drilling rig drilling rod with the core sectional rod is also provided.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a core segment rod and a rotary drilling machine drill rod having the same. Background technique [0002] figure 1 Shown is a schematic cross-sectional view of a conventional core segment rod 10 . Such as figure 1 As shown, the core segment rod 10 includes a core segment rod body 11 , a lifter connector 12 located at the upper end of the core segment rod 10 and a drilling tool connector 13 located at the lower end of the core segment rod 10 . [0003] Wherein, the exterior of the core segment rod body 11 is sheathed with multi-layer outer segment rods. The tube body 11 of the core section rod is matched with the inner keyway provided on the innermost outer section rod through the outer key arranged on it, and the outer section rods of each layer are connected with the outer outer section rod of the inner layer through the outer key of the outer section rod of the inner lay...

AI Technical Summary

Problems solved by technology

[0006] However, in this kind of core segment rod 10, due to structural limitations, the transition fillet between the square head 131 and the connecting portion 132 of the drill joint 13 cannot be processed large enough, which will cause structural stress concentration, so that This position is prone to fatigue fracture during use, which reduces the service life;

[0007] In the core segment rod 10 structure, due to the limitation of the outer diameter of the core segment rod tube body 11, the diameter of the connecting pin shaft 18 is limited, and this design structure is safe for models with a torque below 150KN.M. Yes, when it is applied to a model with a torque greater than 150KN.M, this structure will break and fail, and eventually cause the drilling tool joint 13 to break, and the drilling tool will fall into the hole and other vicious accidents;

[0008] In the structure of the core segment rod 10, the drilling tool joint 13 itself has a large cross-sectional diameter. When the modulation process is performed, the core of the drilling tool joint 13 will be quenched and hardened, and it will be tempered and softened during heat preservation, making the drill The yield strength of tool connector 13 after quenching and tempering is reduced, which cannot meet the design requirements in the design of large models;

[0009] In this core segment rod 10 structure, the torque and pressure of the drilling rig are finally transmitted to the cutting drill through the drill joint 13, which makes the force of the drill joint 13 itself more complicated.

[0010] The core section rod 10 structure is connected with the drilling tool joint 13 through alloy casting through the built-in soft connection. There is no detachable connector at the bottom of the body. At this time, the bottom of the core segment rod body 11 must be cut off to remove the bottom of the core segment rod body 11. After replacing the bottom of the core segment rod body, the steel wire rope 15 has been cut and cannot be connected to the drilling tool again. The head 13 is connected, so that the repaired core section rod 10 loses the function of soft connection and broken rod salvage

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