Drilling Tool Speed Control via Tightening Torque
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Solution Overview
Problem
During rock drilling, the drill bit can become stuck in the rock, leading to torsional oscillations that loosen joints in the drill string and drilling machine, causing damage and heat generation due to insufficient tightening torque, especially during start-up drilling when the rotational speed is set based on higher percussion pressures.
Innovation Solution
An arrangement that controls drilling parameters by adjusting the rotational speed of the drill tool based on available tightening torque, obtained through rotation and feed pressure, to ensure sufficient torque is maintained, preventing joint loosening by lowering the rotational speed when necessary and increasing feed pressure if required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotational speed is set based on higher percussion pressures during full drilling, then the drilling efficiency is improved, but the available tightening torque becomes insufficient during start-up drilling, causing joint loosening and damage
Solution Approach 1:
The rotational speed is made dynamic and adjustable rather than fixed. The control system continuously monitors the available tightening torque and adjusts the rotational speed in real-time to match the actual drilling conditions, ensuring sufficient tightening torque is maintained during start-up while allowing optimal speeds during full drilling.
Solution Approach 2:
The system changes the rotational speed parameter based on the available tightening torque. By monitoring torque availability and adjusting rotational speed accordingly, the system resolves the contradiction between maintaining high drilling efficiency and ensuring joint tightening reliability under varying drilling conditions.
2Reliability
If the rotational speed is reduced to increase available tightening torque, then joint loosening is prevented, but the drilling efficiency decreases
Solution Approach 1:
The system dynamically adjusts rotational speed based on real-time torque availability rather than using a fixed speed. This allows the system to reduce speed only when necessary to maintain sufficient tightening torque, and resume higher speeds when torque availability permits, optimizing the balance between reliability and productivity.
Solution Approach 2:
The control system monitors the available tightening torque and uses this feedback to adjust the rotational speed. This closed-loop control ensures that the rotational speed is always appropriate for the current drilling conditions, preventing joint loosening while maximizing drilling efficiency when possible.
3Productivity
If the rotational speed is increased to improve drilling speed, then productivity increases, but the tightening torque becomes insufficient, causing torsional oscillations and heat generation
Solution Approach 1:
The system monitors tightening torque availability and uses this feedback to control rotational speed. When torque availability is insufficient, the system reduces speed to prevent torsional oscillations and heat generation. When torque availability is sufficient, the system allows higher speeds for improved productivity.
Solution Approach 2:
The rotational speed parameter is adjusted based on the available tightening torque. By changing the speed parameter in response to torque conditions, the system prevents harmful torsional oscillations and heat generation while maintaining high productivity when conditions permit.
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 solution prevents joint loosening and damage by ensuring the rotational speed is adjusted to match available tightening torque, maintaining secure drilling conditions and avoiding heat generation and thread damage, particularly during start-up drilling and in varying rock conditions.
Implementation Method 1
The arrangement comprises means, e.g., a rotation motor, to rotate the drill tool during drilling and provide a tightening torque
Implementation Method 2
the drill tool is pushed towards the rock using high pressure and then crushes the rock using hard metal elements
Implementation Method 3
a piston impacts to transfer impact pulses to the drill tool through the drill string
Implementation Method 4
This loosening of joints causes damaging heat generation and damages threads
Data Source
AI summary
The present invention relates to a method and an arrangement for controlling drilling parameters when rock drilling. The arrangement is arranged such that a drill tool is connectable to a drilling machine by means of one or more drill string components, wherein the arrangement comprises means for rotating the drill tool during rock drilling and for providing a tightening torque for tightening joints between one or more from the group: drill tool, one or more drill string components and drilling machine. The arrangement is arranged to control the rotational speed of the drill tool based on available tightening torque.