Rock Quality Judgment Device and Drilling Machine

Abstract

By drilling a blast hole using a crawler drill, rock quality around the blast hole can be judged at the same time. A rock quality judgment device performs judgment using a differential pressure value between an actual feed pressure and a feed command pressure (differential pressure value judgment) and performs the differential pressure value judgment by comparing the actual feed pressure of a feed motor with the feed command pressure. The rock quality judgment device judges, when the actual feed pressure of the feed motor is lower than the feed command pressure while the drilling is performed, the rock quality as unstable rock. In contrast, the rock quality judgment device judges, when the actual feed pressure is higher than the feed command pressure, the rock quality as stable rock.

What is claimed is: 
     
         1 . A rock quality judgment device configured to judge rock quality at a location at which a drilling machine including a rock drill and a feed mechanism that causes the rock drill to advance is drilling, the rock quality judgment device comprising:
 a pressure acquisition unit configured to acquire actual feed pressure, the actual feed pressure being feed pressure being supplied to the feed mechanism;   a command pressure acquisition unit configured to acquire feed command pressure, the feed command pressure being a command value of the feed pressure; and   a rock quality judgment unit configured to judge rock quality, based on a value acquired by the pressure acquisition unit and a value acquired by the command pressure acquisition unit,   wherein the rock quality judgment unit judges the rock quality as stable rock when the actual feed pressure is greater than or equal to the feed command pressure and judges the rock quality as unstable rock when the actual feed pressure is less than the feed command pressure.   
     
     
         2 . The rock quality judgment device according to  claim 1 , further comprising
 a criterion storage unit configured to:
 set a plurality of numerical value ranges for a value that may include a differential pressure value, the differential pressure value being a difference between the actual feed pressure and the feed command pressure, and 
 store the plurality of numerical value ranges, 
   wherein the criterion storage unit stores each of the plurality of numerical value ranges in association with one of types of rock quality classified as the stable rock, and   when judging the rock quality as the stable rock, the rock quality judgment unit further calculates the differential pressure value and judges the rock quality as a type of rock quality corresponding to a numerical value range in which the differential pressure value is included.   
     
     
         3 . The rock quality judgment device according to  claim 2 , wherein
 the criterion storage unit further stores an additional judgment range as the numerical value range between numerical value ranges corresponding to types of rock quality classified as the stable rock, and   the rock quality judgment unit is configured to:
 determine, when the differential pressure value is included in one of the numerical value ranges each corresponding to one of the types of rock quality, a corresponding type of rock quality as a judgment result, and 
 further perform, when the differential pressure value is included in the additional judgment range, an additional judgment, the additional judgment being rock quality judgment processing not based on the differential pressure value, and determine a judgment result of the additional judgment as a final judgment result. 
   
     
     
         4 . The rock quality judgment device according to  claim 3 , wherein the criterion storage unit stores at least a numerical value range corresponding to hard rock, a numerical value range corresponding to medium-hard rock, a numerical value range corresponding to soft rock, a first additional judgment range, the first additional judgment range being a numerical value range between the hard rock and the medium-hard rock, and a second additional judgment range, the second additional judgment range being a numerical value range between the medium-hard rock and the soft rock. 
     
     
         5 . The rock quality judgment device according to  claim 3 , further comprising:
 a drilling speed acquisition unit configured to acquire drilling speed; and   a hammering pressure acquisition unit configured to acquire hammering pressure of the rock drill,   wherein the criterion storage unit stores a relationship among hammering pressure, the actual feed pressure, and drilling speed corresponding to a type of rock quality classified into the stable rock, and   the rock quality judgment unit performs rock quality judgment, based on the hammering pressure, drilling speed, and the actual feed pressure as the additional judgment.   
     
     
         6 . A drilling machine comprising
 the rock quality judgment device according to  claim 1 .