Crawler Drill Feed Pressure Judgment for Blast Hole Rock Quality
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Solution Overview
Problem
In open-pit mines and quarries, existing rock quality judgment technologies, such as those used in tunnel drilling, are not applicable due to the lack of comprehensive boring surveys, making it difficult to assess rock quality during blast hole drilling, which affects production efficiency and safety.
Innovation Solution
A rock quality judgment device that utilizes a crawler drill to judge rock quality by measuring actual and command feed pressures, differential pressure values, and additional factors like drilling speed and hammering pressure to classify rock types as stable or unstable, with additional judgment ranges for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a crawler drill is used to drill blast holes in an open-pit mine or quarry without comprehensive boring surveys, then drilling operations can proceed, but rock quality judgment becomes difficult affecting production efficiency and safety
Solution Approach 1:
The drilling machine performs self-diagnosis by using its own feed pressure data during drilling operations to judge rock quality. The system leverages the inherent operational parameters (actual feed pressure and command feed pressure) already generated during normal drilling to automatically determine rock quality, eliminating the need for separate survey operations or external data sources.
2Measurement precision
If advanced prediction is performed using boring survey data in tunnel drilling, then rock quality judgment precision is improved, but comprehensive boring surveys are not feasible in open-pit mines or quarries
Solution Approach 1:
The invention changes the data source from pre-obtained boring survey parameters to real-time feed pressure parameters generated during drilling operations. By utilizing actual feed pressure and command feed pressure that are naturally produced during drilling, the system adapts the rock quality judgment method to work in open-pit mines and quarries where comprehensive boring surveys are not performed.
3Reliability
If rock quality is not accurately judged during blast hole drilling, then drilling operations continue, but explosive charging cannot be optimized leading to reduced production efficiency and safety issues
Solution Approach 1:
The system implements feedback by continuously monitoring the relationship between actual feed pressure and command feed pressure during drilling, and using this feedback to automatically judge rock quality. This real-time feedback mechanism enables immediate identification of rock quality conditions, allowing for optimized explosive charging decisions that improve both safety and production efficiency.
Data Source
AI summary
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.