A drill pipe for a rotary drilling rig

Abstract

The invention provides a drill rod for a rotary drilling rig, which is characterized in that it includes a square head, a main rod, a bearing plate and at least one key bar; the bearing plate is provided with an inner hole of the bearing plate; Extending through the inner hole of the bearing plate to the cavity of the main rod to connect with the main rod; the inner hole of the bearing plate and the cavity of the main rod are respectively matched with the square head; the bearing plate is also provided with a recess matching the key bar; The key strips are distributed along the outer circumference of the main rod and connected with the outer side of the main rod, and the lower ends of the key bars extend into the recesses to connect with the bearing plate; the main rod is connected to the square head by welding; the The key strips are respectively connected to the main rod and the bearing plate by welding. The drill pipe can reduce the impact of torque on the weld between the square head and the main rod, effectively improve the reliability of the connection between the square head and the main rod, and has a long service life, which can reduce the maintenance frequency of the rotary drilling rig and prolong the period of trouble-free operation .

Description

technical field [0001] The invention relates to the technical field of drill rods, in particular to a drill rod for a rotary drilling machine. Background technique [0002] In the hole-forming process of concrete pouring piles below the surface, the rotary drilling rig is one of the commonly used foundation engineering construction equipment. Rotary drilling rigs usually use friction-type or machine-locking drill pipes, and with corresponding drill bits / drilling tools, they can complete various foundation drilling operations. The square head located at the lower part of the drill pipe is connected with different specifications of drill bits / drilling tools through the pin shaft parts, so as to realize the transmission of rotational torque. Whether it is a friction type or a machine lock type drill pipe, most of them are made of multi-sections stacked on each other, and the innermost section of the drill pipe is the longest, with a square head at the bottom and a main rod abo...

AI Technical Summary

Problems solved by technology

As the use time of the drill pipe continues to accumulate, the plane circular weld is prone to cracks, causing the drill pipe to fail and be damaged; especially in the welding process, due to factors such as technology or materials, it is easy to cause many welding defects in the weld, thus As a result, cracks are more likely to occur in plane circular welds, and once cracks appear in the same plane, their development speed is extremely fast

Therefore, drill pipe damage occurs frequently, requiring frequent downtime for maintenance and replacement. The maintenance cycle is long and the work intensity is high, resulting in long-term shutdown of the rotary drilling rig

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