¿Cuáles son las características de la varilla de barrena integral?
1) Applicability to conventional full-hydraulic drilling rigs in coal mining industry, that is, the application of drill pipes does not need to upgrade the current drilling rigs, and will not improve the construction procedures of exploration projects and the work intensity of construction personnel;
2) Arrange single-head, double-head or triple-head helical milling grooves on-site in the axial direction of the drill pipe, not only to ensure the overall hardness of the drill pipe, but also to ensure the professional ability of the drill pipe to stir powder and discharge powder.
3) The connector adopts the feature of double top diameter structure and adopts slanted trapezoidal profile. The tensile strength and torsional strength are respectively increased by 30% and 40% compared with the conventional drill pipe; fully consider the technical characteristics of the hole protection screen pipe under the rapid speed of soft coal rock. There are two types of connectors, conventional diameter and large diameter.
4) The basic parameters of helical groove milling include the depth of the groove, the overall width and the structural characteristics of the groove. The depth and total width of the milling groove refer to the welding type wide fin spiral drill pipe fins, and the milling groove angle adopts too many arcs to reduce the internal stress condition.
5) The connector adopts friction welding technology. The technology has the characteristics of high quality, high efficiency, environmental protection, energy saving and no pollution, high level of mechanical automation, and high production efficiency.
6) The connector adopts the heat treatment method to realize the annealing process for the thermal interference area of the welding gap to improve its comprehensive mechanical properties.
7) The integral helical drill pipe adopts the common heat treatment and tempering annealing process.
