How to buy a trolley drill rod?

How to buy a trolley drill rod?
1. Understand the characteristics of the drill rod. The trolley drill rod is a drill tool that uses an alloy steel pipe to thicken the upsetting heads at both ends, turn the small pitch tapered thread, and connect it with a locking joint. It is used in the field of geological exploration to transmit the drilling torque to the bottom hole drill bit and is responsible for transmitting the drilling fluid. Common connection methods include male and female connections (tapered threads) and joint connections (rectangular internal threads).
2. Understand the materials of the trolley drill rod. At present, the national standard materials include DZ40, DZ50, DZ60, R780, etc. Among them, R780 is the best and has outstanding toughness and wear resistance. The trolley drill rod body produced by Yikuang Technology is made of geological special alloy steel pipe (R780, DZ50). The trolley drill rod drill bit is made of alloy structural steel (42CrMo). After rough processing, vacuum tempering heat treatment is carried out. Surface nitriding after finishing can effectively solve the problems of bonding and stretching, and it is more wear-resistant and easy to disassemble, greatly improving fatigue strength and shear strength.
3. According to the drilling capacity parameters, drilling diameter and drilling depth of the drilling rig, the drill pipe diameter is determined by the empirical ratio of D/D=4.5.
4. Select the drill pipe according to the main parameters of the drill pipe design, namely torque and feed pressure. As we all know, the torque of the drill pipe is transmitted by the engagement and extrusion of the key and keyway. Due to reasons such as machining accuracy, material properties, and welding process, it is impossible to evenly distribute the torque on each key, and each contact key cannot evenly contact the force, so the long key often partially breaks. When selecting the design torque of the drill pipe, it needs to be greater than the design torque of the drilling rig.
5. Understand the processing process of the drill pipe. In addition to good materials, surface hardening is also important to ensure good wear resistance of the trolley drill pipe. Standard processing of threaded parts ensures that the joints are often loosened without damage. The trolley drill pipe has the characteristics of high bending strength and firm welding, which can ensure the straightness requirements of deep hole drilling and have a long service life.