Drilling Device Thread Engagement Control
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Solution Overview
Problem
Existing methods for screwing together drill rod elements often result in excessive loads and wear due to uncertain thread engagement, leading to increased frictional wear and reduced service life, especially when dealing with dirty or deformed threads.
Innovation Solution
A drilling device equipped with a distance measuring means to detect the actual adjustment distance of the drill drive, allowing the control unit to calculate a nominal adjustment distance based on the drill drive's revolution speed and thread constant, enabling precise control of the screwing movement to avoid excessive axial forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drill drive is displaced axially during idle rotations before thread engagement, then the screwing process can start sooner, but excessive loads and frictional wear occur on the thread regions
Solution Approach 1:
The control unit continuously monitors the axial position of the drill drive and compares it with the theoretical position based on rotational speed and thread constant. When the actual position deviates from the theoretical position, the control unit adjusts the axial displacement to prevent excessive loads on the thread regions, thereby resolving the contradiction between productivity and thread durability
Solution Approach 2:
The system performs preliminary detection of the axial position and rotational speed before initiating axial displacement. By calculating the theoretical axial position based on the thread constant and rotational speed, the control unit ensures that axial movement only begins when thread engagement is confirmed, avoiding premature displacement that would cause excessive loads
2Reliability
If the drill drive waits for confirmed thread engagement before axial displacement, then thread loads are reduced, but the screwing process takes longer
Solution Approach 1:
The control unit continuously monitors the axial position and rotational speed, providing real-time feedback to calculate the theoretical axial position. This continuous monitoring allows the system to confirm thread engagement faster by comparing actual position with theoretical position, reducing the waiting time while still ensuring thread protection
Solution Approach 2:
The system replaces mechanical methods of detecting thread engagement (such as load sensors or position switches) with a computational approach using the control unit to calculate theoretical position based on rotational speed and thread constant. This substitution allows for faster, more precise engagement detection without additional mechanical components
3Adaptability or versatility
If high limit loads are set to accommodate dirty or deformed threads, then automatic screwing can proceed, but frictional wear and stresses on threads increase
Solution Approach 1:
The control unit continuously monitors the actual axial position and compares it with the theoretical position calculated from rotational speed and thread constant. This feedback mechanism allows the system to detect deviations caused by dirty or deformed threads and adjust the axial displacement in real-time, maintaining gentle screwing conditions even when thread conditions are poor
Solution Approach 2:
The system dynamically adjusts the axial displacement based on real-time monitoring of actual versus theoretical position. When deviations indicate dirty or deformed threads, the control unit modifies the displacement pattern to maintain appropriate loads, allowing the screwing process to proceed gently despite varying thread conditions
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 allows for gentle screwing and release of thread connections, reducing frictional wear and increasing the service life of drill rod elements while ensuring energy-efficient operation.
Implementation Method 1
a distance measuring means is provided, by which an adjustment distance of the drill drive along a guide can be detected as an actual value
Implementation Method 2
by the control unit a revolution speed of the drill drive during screwing can be detected and, on taking account of a predetermined thread constant, an adjustment distance can be determined as a nominal value
Implementation Method 3
the second drill rod element is rotated by the drill drive, and a control unit, by which the drill drive and the positioning means are actuated in a controlled manner, wherein the first thread region and the second thread region are screwed together
Implementation Method 4
a clamping means which is arranged on the drill drive for holding at least a second drill rod element with a second thread region
Implementation Method 5
a receiving part for receiving and holding at least a first drill rod element with a first thread region
Data Source
AI summary
A drilling device having a drill drive, a positioning means, a receiving part, a clamping means, and a control unit. The receiving part holds a first drill rod element with a first thread region. The clamping means is positioned on the drill drive for holding at least a second drill rod element having a second thread region. The control unit actuates the drill drive and the positioning means to screw the first and second thread regions together. A distance measuring means detects an adjustment distance of the drill drive along a guide as an actual value. The control unit determines an adjustment distance as a nominal value from a detected revolution speed of the drill drive during screwing and a predetermined thread constant. The control unit determines a difference from the nominal and actual values, and uses the difference to adjust the drill drive and/or the positioning means.