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E262-3046
YASSIAN or Your's
How to check if the drill rod connection is loose
Methods for checking if the drill rod connection is loose
1. Visual inspection (basic screening)
Observe thread wear
Check if the threaded sections of the drill rod and connection sleeve show obvious wear, deformation, or corrosion. If wear exceeds 10% of the original thread height, replacement is required.
Use a magnifying glass to inspect the thread roots for cracks or plastic deformation (e.g., thread “crushing” phenomena).
Coupling sleeve condition
Confirm whether the clearance between the coupling sleeve and drill rod is uniform. If one side has significantly greater clearance than the other, it may indicate loosening.
2. Tool-assisted inspection
Tap test
Gently tap the connection area with a rubber hammer. If a hollow sound is heard or the drill rod feels displaced, loosening may be present.
Torque Test
Use a torque wrench to retighten the bolts/threads, comparing the initial installation torque value (e.g., if the design requirement is 150 N·m, the retightening torque must reach ±10% of this value).
Strain Gauge Monitoring
Attach strain gauges to the drill rod connection points and monitor the tightening status through resistance changes (suitable for high-precision scenarios).
III. Professional Inspection Techniques
Ultrasonic Inspection
Use ultrasonic waves to detect minute gaps between the connection sleeve and drill rod, enabling non-contact detection of loosening (with a precision of 0.1 mm).
Vibration Analysis
Monitor the vibration frequency of the drill rod during operation using vibration sensors; loosening causes abnormal vibration spectra.
4. Operational Guidelines
Lubrication Maintenance: Apply specialized grease (e.g., NLGI Grade 2) every 2 hours to reduce thread wear.
Anti-loosening Measures: Install anti-loosening washers or apply thread locking agents (e.g., Loctite 243).
Comprehensive inspections can effectively prevent fractures caused by loosening of drill rod connections, extending service life by over 30%.
How to check if the drill rod connection is loose
Methods for checking if the drill rod connection is loose
1. Visual inspection (basic screening)
Observe thread wear
Check if the threaded sections of the drill rod and connection sleeve show obvious wear, deformation, or corrosion. If wear exceeds 10% of the original thread height, replacement is required.
Use a magnifying glass to inspect the thread roots for cracks or plastic deformation (e.g., thread “crushing” phenomena).
Coupling sleeve condition
Confirm whether the clearance between the coupling sleeve and drill rod is uniform. If one side has significantly greater clearance than the other, it may indicate loosening.
2. Tool-assisted inspection
Tap test
Gently tap the connection area with a rubber hammer. If a hollow sound is heard or the drill rod feels displaced, loosening may be present.
Torque Test
Use a torque wrench to retighten the bolts/threads, comparing the initial installation torque value (e.g., if the design requirement is 150 N·m, the retightening torque must reach ±10% of this value).
Strain Gauge Monitoring
Attach strain gauges to the drill rod connection points and monitor the tightening status through resistance changes (suitable for high-precision scenarios).
III. Professional Inspection Techniques
Ultrasonic Inspection
Use ultrasonic waves to detect minute gaps between the connection sleeve and drill rod, enabling non-contact detection of loosening (with a precision of 0.1 mm).
Vibration Analysis
Monitor the vibration frequency of the drill rod during operation using vibration sensors; loosening causes abnormal vibration spectra.
4. Operational Guidelines
Lubrication Maintenance: Apply specialized grease (e.g., NLGI Grade 2) every 2 hours to reduce thread wear.
Anti-loosening Measures: Install anti-loosening washers or apply thread locking agents (e.g., Loctite 243).
Comprehensive inspections can effectively prevent fractures caused by loosening of drill rod connections, extending service life by over 30%.
