Adjustable Breakout Wrench for Blasthole Drill Rods of Different Diameters

Abstract

Adjustable Breakout Wrench for Blasthole Drill Rods of Different Diameters that works through an automatic sequence of movements, which are approaches (turns), bar tightening, and exponential torque combined with pressure from two hydraulic cylinders, which act with built-in sequential valve regulation, as well as automatic adjustment that considers the wear in the external diameter of the rod. This tool, which has the general shape of an alligator wrench, can be mounted on drilling machines. It is designed to loose threaded rod joints of different diameters. For this purpose, it provides a practical and quick exchange of Jaw Kits, which have the preconceived dimensions to efficiently tighten each rod measure. This tool is efficient, practical, easy to maintain and above all versatile so that it can operate in drilling production with different diameters of rods, only making simple changes of components without disassembling the wrench from its support.

1 . An Adjustable Breakout Wrench Tool for Blasthole Drill Rods of Different Diameters comprising:
 a) A Main Body;   b) a Main Arm;   c) a Torque Arm;   d) a Wrench Support susceptible of being permanently fixed to the surface a blasthole drill;   e) a Main Shaft connecting said Wrench Support to said Main Body, wherein said Main Shaft acts as turning point of said Main Body;   f) three fixed Holder Inserts;   g) at least three interchangeable Jaw Kits, each of said Jaw Kits comprising two Jaw Holders, a Backing Jaw, a Torque Jaw, and a Grip Jaw, wherein said first Jaw Kit is adapted to grip and loosen a Drill Rod having a first diameter, said second Jaw Kit is adapted to grip and loosen a Drill Rod having a second diameter and said Third Jaw Kit is adapted to grip and loosen a Drill Rod having a third diameter;   h) a Grip Cylinder;   i) a Positioning Cylinder;   j) a Torque Cylinder;   k) a Sequential Valve;   l) a Traction Spring which keeps said Torque Arm with a tendency to open;   m) a Torque Cylinder Support fixed to said Wrench Support;   and   n) a Sequential Valve Support fixed to said Main Body.