Rock Drilling Rig Stress Wave Momentum Feedback Control
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Solution Overview
Problem
Existing rock drilling systems face challenges in accurately measuring and controlling stress wave energy reflected from the rock, leading to inefficient drilling due to loss of sign information and inability to adapt to varying drilling conditions.
Innovation Solution
Measuring the momentum of the stress wave reflected from the rock using displacement data to adjust the operation of the impact and feed devices, maintaining information on whether the reflected stress wave represents tensile or compressive stress, allowing for real-time adjustment of drilling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the energy of the stress wave reflected from the rock is measured to control drilling, then the drilling efficiency can be improved, but the sign information of the reflected stress wave is lost making accurate measurement difficult
Solution Approach 1:
The patent replaces the conventional energy-based measurement system with a momentum-based measurement system. By measuring the momentum of the reflected stress wave instead of its energy, the system maintains the sign information that indicates whether the wave is compressive or tensile. This substitution of the measurement parameter (from energy to momentum) resolves the information loss problem while preserving the ability to control drilling efficiency.
Solution Approach 2:
The patent changes the measurement parameter from stress wave energy to stress wave momentum. This parameter change allows the system to retain sign information about the reflected stress wave, enabling distinction between compressive and tensile waves. The momentum parameter encompasses both magnitude and direction information, thereby solving the information loss issue while maintaining drilling control capability.
2Productivity
If the amplitude of the stress wave is increased to break hard rock, then the drilling penetration improves, but the equipment strain increases
Solution Approach 1:
The patent implements a feedback control system that measures the momentum of the reflected stress wave and uses this information to adjust the impact device parameters in real-time. By monitoring the momentum of reflected waves, the system can detect when equipment strain becomes excessive and automatically adjust the stress wave amplitude to optimal levels, thereby maintaining drilling penetration while preventing harmful equipment strain.
Solution Approach 2:
The patent makes the stress wave generation dynamic by continuously adjusting the impact device parameters based on real-time measurements of reflected stress wave momentum. This dynamic adjustment allows the system to optimize the amplitude of stress waves for different rock conditions, increasing amplitude when needed for hard rock penetration and reducing it when equipment strain becomes problematic, thus resolving the contradiction between penetration and equipment protection.
3Productivity
If the stress wave duration is extended to improve rock breaking, then the drilling efficiency increases, but the reflected energy increases causing equipment strain
Solution Approach 1:
The patent uses feedback control by measuring the momentum of reflected stress waves and adjusting the impact device parameters accordingly. This feedback mechanism allows the system to optimize stress wave duration by detecting when reflected energy becomes excessive and automatically reducing the duration parameter, thereby maintaining drilling efficiency while minimizing equipment strain from reflected energy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables precise control of the drilling process, reducing unnecessary strain on equipment and improving drilling efficiency by distinguishing between different rock types and conditions, thereby optimizing drilling performance.
Implementation Method 1
the impact device being arranged to cause a stress wave to the tool and the tool being arranged to deliver the stress wave caused by the impact device as a compressive stress wave to the drill bit and from there further to the rock to be drilled
Implementation Method 2
during drilling at least some of the compressive stress wave caused to the tool by the impact device is reflected as a stress wave from the rock to be drilled back to the tool
Implementation Method 3
measuring means arranged to measure a displacement of the tool to the drilling direction or towards the drilling machine and the control and data processing unit being arranged to determine on the basis of the displacement of the tool the momentum of the stress wave reflected from the rock to be drilled to the tool
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
A rock drilling rig (1) is provided with a rock drilling machine (6) comprising an impact device (4), a feed device (9) and a tool (7) with a drill bit (8) at the end thereof for breaking rock. The impact device is arranged to cause a stress wave to the tool and from there further to the rock to be drilled. During drilling at least some of the compressive stress wave (si) caused to the tool is reflected as a stress wave (sr) from the rock back to the tool. The method comprises determining a momentum ( Pr ) of the stress wave ( sr) reflected from the rock to the tool and adjusting the operation of the impact device and/or that of the feed device on the basis of the momentum.