What is the working principle of the fully hydraulic rope coring drill?
The hydraulic motor drives the drill pipe to rotate, the diamond drill bit cuts the rock formation, and the high-pressure mud pump delivers the flushing fluid to the bottom of the hole through the center hole of the drill pipe, cools the drill bit and carries the cuttings back to the surface.
Features of rope coring: When the core fills the coring tube, there is no need to lift the drill. The inner tube assembly (including the core) is lifted out of the drill pipe by the wire rope, and the outer drill pipe continues to remain in the hole.
2.Coring stage:
The salvage is lowered by the winch and docked with the salvage head of the inner tube assembly. The hydraulic winch quickly recovers the inner tube to complete the coring (reducing the drilling time by more than 70% compared with conventional drilling rigs).
After the inner tube is taken out, the spare inner tube assembly is replaced and drilling continues to achieve “continuous coring without lifting the drill”.
What are the main components of the fully hydraulic rope coring drill?
1.Power and drive system
Diesel engine/motor: provides the original power
Hydraulic pump station: variable piston pump group, outputs high-pressure oil
Hydraulic motor: low-speed high-torque motor, drives the drill pipe to rotate
2.Drilling execution system
Drill pipe: high-strength alloy steel pipe, polished inner wall to ensure smooth passage of the salvage
Rope coring equipment includes:
- Outer tube assembly
- Inner tube assembly
Drill bit: diamond surface-set/impregnated drill bit, suitable for 6-12 grade rock formations
3.Hydraulic control system
Multi-way valve group: Eaton or Rexroth proportional valve, controls feed/rotation/lifting action
Load-sensitive valve: real-time matching of drilling pressure requirements, energy saving of more than 20%
Wind: wire rope speed ≥1.5m/s, fast release/recovery of salvage
4.Auxiliary system
Mud circulation system: three-cylinder plunger pump, equipped with cyclone desander
Operation platform: integrated human-machine interface, displaying parameters such as drilling pressure, speed, pump pressure, etc.
Anti-sway device hydraulic clamp prevents drill pipe from swinging, verticality error ≤1°