In rope core drilling operations, in addition to the core drilling equipment, a series of accessories are required to assist in the operation, ensure safety, and improve the quality of core extraction. Below is a systematic analysis of commonly used accessories and their functions, optimized for better understanding and application.
Core Drilling System
Core Recovery Tool Assembly
Core Recovery Tool Body: Made from high-strength alloys, it is wear-resistant and corrosion-resistant. Its grasping ability and uncoupling performance directly determine the efficiency of core extraction.
Core Recovery Steel Cable: Serves both as a power transmission and data transfer medium. It requires high strength and durability to ensure stable operation of the overall system.
Weight Rod: Enhances the stability of the core recovery tool during descent, ensuring precision, especially in deep holes.
Safety Uncoupler: Designed with a set tension threshold. It automatically disconnects when overloaded, protecting the equipment.
Inner Pipe Assembly
Snap Ring Positioning Mechanism: Ensures accurate positioning and stable operation of the inner pipe, adapting to different rock layer conditions.
Single-Action Bearing Mechanism: Prevents synchronous rotation of the inner and outer pipes, ensuring core integrity.
Core Snap Ring: Grabs and secures the core, preventing displacement or loss during retrieval.
Outer Pipe Assembly
Drill Rod: Serves as the primary load-bearing and transmission component, requiring high strength, resistance to bending, and corrosion resistance.
Drill Bit: Typically made with diamond composite or impregnated diamond design, ensuring efficient cutting and core protection.
Operation and Control Equipment
Core Recovery Winch
Provides the power for lifting the rope and controls the core recovery process smoothly. Its accuracy affects both core recovery efficiency and equipment lifespan.
Hydraulic Pipe Wrench
Used for quick connection and disconnection of drill rods, with adjustable torque to ensure secure connections while preventing thread damage.
Drill Rod Holder
Provides stable clamping when connecting or disconnecting the drill rods, preventing slippage or misalignment.
Auxiliary Equipment
Mud Pump
Circulates mud to cool the drill bit, carry rock cuttings, and protect the borehole wall. Its performance affects the fluidity of the drilling fluid and the stability of the borehole wall.
Hoist
Handles the lifting and lowering of drilling tools and ropes, providing stable power output to meet the requirements of varying hole depths.
Standard Penetration Test (SPT) Equipment
Used for in-situ testing of soil layer compaction and rock strength, providing data for adjusting drilling parameters.
Core Box
Used for organizing, numbering, and storing cores. The design must ensure shock and moisture protection to preserve the core’s original state.
Inclination Measuring Instrument
Monitors the trajectory of the drill hole, preventing deviation beyond tolerance and ensuring borehole quality.
Maintenance and Protective Accessories
Thread Lubricant (Thread Grease)
Used to lubricate the threads of the drill rods, reducing wear and preventing cold welding, which extends the lifespan of the threads.
Thread Protector/Caps
Protects the threads of the drill rods during storage and transportation to prevent impact and corrosion.
Conclusion
The efficient operation of a Rope core drill rig relies on the coordinated operation of its various accessories. Proper selection and maintenance of these accessories can not only improve core quality and drilling efficiency but also significantly reduce equipment failure rates and operational risks. In practical applications, it is recommended to select and regularly check accessories based on specific geological conditions and process requirements.
