Reverse Circulation DTH Drilling Tools
  • Reverse Circulation DTH Drilling Tools
  • Reverse Circulation DTH Drilling Tools
  • Reverse Circulation DTH Drilling Tools
  • Reverse Circulation DTH Drilling Tools
  • Reverse Circulation DTH Drilling Tools

Reverse Circulation DTH Drilling Tools

Reverse circulation DTH drilling is a high-efficiency mineral sampling method powered by compressed air, typically utilized with specialized RC rigs, dual-wall drill pipes, and sampling discharge systems.

As the core component of this drilling system, our RC DTH drilling tools consist of a RC DTH hammer, dual-wall drill pipes and drill bits. During operation, the hammer delivers high-frequency impacts to fracture the rock while creating a stable suction effect at the bit face. This ensures that cuttings and samples are instantly transported through the inner tube to the surface. This process guarantees continuous sampling, minimal contamination, and high sample representativeness, making it an ideal choice for geological exploration and mineral sampling.

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Features
  • Compressed air and the returning fluid are transported within a sealed dual-wall drill string, avoiding contact with the borehole walls and preventing scouring, greatly reducing the risk of downhole accidents and maintaining borehole stability. It is especially effective in complex or loss-prone formations.
  • Rock and mineral samples are carried through the central channel directly to the surface without touching the borehole walls, ensuring high sampling rates and contamination-free samples.
  • Cuttings are discharged through the central channel to designated collection points, enabling centralized handling, precise geological layer identification, dust prevention, and reduced environmental contamination. This also improves working conditions, prolongs equipment service life, and increases rig uptime.
Applications

Primarily suitable for medium to high hardness rock formations such as granite, basalt, and limestone. Widely applied in mining, water well drilling, geological exploration, and tunnel engineering. Particularly advantageous for projects requiring high drilling depth, verticality, and efficiency.

Technical Parameters
Model
(SPM P/N) 		Hammer OD,
mm 		Hammer length
(W/O bit), mm 		Drilling dia., mm Sample tube dia.,
mm 		Working pressure,
MPa 		Air consumption,
m³/min 		Top sub thread Weight,
kg
RC35 90 991 95-110 30 0.7-2.1 4.2-14 T 2 3/8 Box 30
RC45 105 1038 115-130 36 0.7-2.1 4.5-20 T 2 7/8 Box 41
RC50 116 975 127-140 30 0.7-2.4 6-20.6 T 3 1/2 Box 48
RC55 124 1038 133-152 36 0.7-2.4 6-21.5 T 4 Box 60.5
RC65 154 1040 159-203 61 0.7-2.4 7-25.5 T 4 5/8 Box 89
RC85 190 1254 203-241 61 0.7-2.4 10-30.5 T 6 Box 167
RC100 230 1345 241-311 76 0.7-2.4 15-34 T 6 5/8 Box 263
RC120 285 1410 311-350 85 0.7-2.4 20.37.8 T 8 5/8 Box 423.5
RC140 330 1520 355-410 98 0.7-2.4 23-54.5 M 10 3/4 Box 921
RC160 394 1807 406-508 110 0.7-2.4 27-91.4 M 10 3/5 Box 1308
Structure

Using RC35 as an example (the structure of other models may differ in internal components)

RC35
  • Circlip
  • Center tube
  • Backhead
  • O-Ring
  • O-Ring
  • Check valve
  • Spring
  • Support seat
  • O-Ring
  • O-Ring
  • Cylinder
  • Piston
  • Center tube
  • Casing
  • Bearing bush
  • O-Ring
  • Bit ring
  • O-Ring
  • Sleeve
  • Drive sub
  • Bit

The rock drilling tools are compatible with handheld rock drills, drilling jumbos, surface rock drills, and rock drill and splitter commonly used in international engineering machinery.

Mining applications require high wear resistance and fracture toughness. Durable alloy spherical-button bits are commonly used, suitable for drilling hard rock and medium to large-diameter blast holes.

Tunnel drilling typically uses cross bits or small spherical-button bits paired with lightweight rock drills to improve maneuverability and excavation efficiency.

Surface mining blast-hole drilling commonly uses large-diameter spherical-button bits and extended threaded rods, paired with medium- or heavy-duty rock drills to ensure hole diameter and depth.

Small blasting operations typically use multi-sided rods and flat-edge ballistic button bits, suitable for handheld rock drills to quickly create shallow holes.