Drilling Parameter Control via Damping Pressure Feedback
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Solution Overview
Problem
Current rock drilling methods, particularly percussion drilling, face challenges in controlling drilling parameters effectively during initial drilling, leading to potential deviations in borehole direction and increased wear and tear due to complex control programs and issues with discontinuities in rock hardness and fissures.
Innovation Solution
A method and device that control percussion pressure and feed pressure by determining a mean damping pressure value, adjusting based on differences between this value and a reference pressure, and using this to manage the drilling process, including reducing pressures when necessary to prevent harmful reflections and ensure correct contact with the rock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex multi-stage control programs are used to manage drilling parameters, then drilling precision can be improved, but device complexity increases
Solution Approach 1:
The patent implements feedback control by continuously monitoring the actual drilling parameters (percussion pressure, feed force) and comparing them with target values, then automatically adjusting the parameters to maintain optimal drilling conditions throughout the entire drilling process, eliminating the need for complex multi-stage control programs
Solution Approach 2:
The drilling system performs self-adjustment by automatically modifying its own operating parameters based on real-time monitoring of drilling conditions, with the control system adapting percussion pressure and feed force without external intervention or complex pre-programming
2Productivity
If high percussion pressure is applied during initial drilling, then productivity increases, but harmful reflections and equipment damage occur
Solution Approach 1:
The patent applies dynamic control by continuously adjusting percussion pressure and feed force according to real-time drilling conditions, allowing the system to operate at optimal power levels throughout drilling while automatically reducing pressure when encountering discontinuities or initial drilling phases, thus preventing harmful reflections without sacrificing overall productivity
Solution Approach 2:
The system dynamically changes operating parameters (percussion pressure, feed force) based on monitored drilling conditions, transitioning smoothly between different drilling phases and rock conditions to maintain high productivity while preventing damage from excessive pressure
3Manufacturing precision
If reduced feed force is used during initial drilling, then borehole direction accuracy improves, but drilling time increases
Solution Approach 1:
The patent maintains continuous optimal drilling action throughout the entire drilling process by dynamically adjusting parameters, eliminating idle time or reduced-power phases while ensuring accurate borehole direction through continuous feedback control, thus achieving both precision and efficiency simultaneously
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
Simplifies the initial drilling phase, reduces wear and tear, and maintains optimal drilling parameters throughout the process by minimizing the number of parameters needed for control, ensuring accurate borehole direction and depth, and preventing damage from high pressures in varying rock conditions.
Implementation Method 1
a percussion piston, which is often operated hydraulically, is used to create a shock wave with the aid of an impact force that is generated by hydraulic pressure (percussion pressure)
Implementation Method 2
The bearing pressure of the drill bit against the rock is influenced by the abovementioned feed pressure through a damping piston arranged in a damping system, which is also used to damp the percussion pulse reflections from the rock
Implementation Method 3
a percussion piston, which is often operated hydraulically, is used to create a shock wave with the aid of an impact force that is generated by hydraulic pressure
Implementation Method 4
create a shock wave with the aid of an impact force that is generated by hydraulic pressure
Implementation Method 5
On contact with the rock, hard alloy pins of the drill bit contacting the rock, are pushed into the rock, thereby generating a strong enough force to fragment the rock
Data Source
AI summary
The present invention relates to a method and a device for controlling at least one drilling parameter when drilling into rock with a drilling machine, where a percussion pressure and/or a feed pressure of the drilling machine, which generate a percussive force and a feed force respectively, are controlled during the drilling operation. A parameter value is determined that represents the mean value of a damping pressure in a damping chamber used both for transmitting a feed force to a drill string that is connected to the drilling machine, and for damping rock reflections from this drill string; a difference between the said mean value of the determined damping pressure and a reference value of the damping pressure is also determined. The percussion pressure and/or the feed pressure of the drilling machine is then controlled on the basis of this difference.