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In DTH drilling, the rock drilling bit is a continuation of the shank, which the rock drill piston strikes directly. Since the piston is in direct contact with the drill bit, little energy is lost. This gives DTH drilling a nearly constant penetration rate regardless of hole length.
DTH bits are paired with their corresponding hammers (by drilling hole diameter and spline configuration). Customers can customize their DTH bits in various ways, such as changing the tungsten carbide insert profile (spherical, ballistic, etc.), face profile (flat face, concave, convex, etc.), and flushing holes.
Color: Green,Blue or Based on Customer requirements
Specification of Reverse Circulation Bits
Reverse Circulation Hammers Specification:
| Reverse Circulation Hammers | ||||
| Description | Weight(kg) | |||
| RC45 | RC55 | RC65 | RC52 | |
| 1. Internal Circlip | 0.03 | 0.04 | 0.05 | 0.04 |
| 2. Air Screen | 0.35 | 0.44 | 0.65 | 0.44 |
| 3. Top Sub | 6.50 | 9.65 | 20.00 | 9.65 |
| 4. "O" Ring | 0.01 | 0.02 | 0.02 | 0.02 |
| 5. Sample Tube | 5.10 | 6.72 | 12.50 | 6.75 |
| 6. Check Valve | 0.25 | 0.68 | 0.85 | 0.68 |
| 7. Spring | 0.04 | 0.12 | 0.10 | 0.12 |
| 8. "O" Ring | 0.01 | 0.02 | 0.02 | 0.02 |
| 9. Air Distributor | 0.85 | 1.48 | 3.50 | 1.48 |
| 10. "O" Ring | 0.02 | 0.01 | 0.02 | 0.01 |
| 11. Internal Cylinder | 2.20 | 4.12 | 4.20 | 4.12 |
| 12. Piston | 8.50 | 16.90 | 24.00 | 16.90 |
| 13. External Cylinder | 14.50 | 19.50 | 32.00 | 21.50 |
| 14. Guided Sleeve | 1.20 | 0.90 | 5.50 | 1.90 |
| 15. "O" Ring | - | - | - | 0.02 |
| 16. Stop "O" Ring | - | - | - | 0.01 |
| 17. Stop Ring | - | - | - | 0.32 |
| 18. Shrout | - | - | - | 1.86 |
| 19. Drive Chuck | 3.20 | 5.65 | 6.50 | 4.17 |
| 20. Bit Retaining Pin | 0.01 | 0.15 | 0.30 | - |
| 21. Drill Bit | 10.50 | 15.80 | 31.00 | 11.05 |
| Technical Data | ||||
| Model | RC45 | RC55 | RC65 | RC52 |
| Length (Without Bit) | 1020mm | 1111mm | 1250mm | 1208mm |
| Weight (Without Bit) | 94.00kg | 66.50kg | 110.00kg | 70.00kg |
| External Diameter | φ99mm | φ126mm | φ146mm | φ126mm |
| Bit Shank | NRC45 | NRC55 | NRC65 | PR52 |
| Hole Range | φ114 - φ127mm | φ133- φ152mm | φ155- φ190mm | φ133- φ146mm |
| Connection Thread | As required | As required | As required | As required |
| Working Pressure | 1.0 - 3.0 Mpa | 1.5 - 3.5 Mpa | 1.5 - 3.5 Mpa | 1.5 - 3.5 Mpa |
| Impact Rate at 17 Bar | 30HZ | 35HZ | 28HZ | 35HZ |
| Recommended Rotation Speed | 25 - 40 r/min | 25 - 40 r/min | 25 - 40 r/min | 25 - 40 r/min |
| Air Consumption | 1.0Mpa: 8 m³/ min | 1.7Mpa: 16 m³/ min | 1.7Mpa: 20 m³/ min | 1.7Mpa: 16 m³/ min |
| 1.8Mpa: 12 m³/ min | 2.4Mpa: 22 m³/ min | 2.0Mpa: 26 m³/ min | 2.4Mpa: 22 m³/ min | |
| 2.4Mpa: 16 m³/ min | 3.0Mpa: 28 m³/ min | 3.0Mpa: 35 m³/ min | 3.0Mpa: 28 m³/ min | |
Characteristics of Reverse Circulation Bits:
1.Based on previous experience of ordinary hammers, combined with the features of reverse circulation hammer, optimized internal structure and ideal energy transfer, thus ensuring the series of hammers drilling with fast, smooth and continuous sampling.
2. The internal structure is very simple with components of high rigidity, thus ensuring long life and easy maintenance of the hammer.
3.The collection tube adopts an integrative design and can be replaced without disassembling the hammer. With carburizing treatment, it has good abrasive resistance.
4.Equipped with bits designed with patent. Simply by replacing the drill bit, the same hammer can drill holes of different sizes ensuring that the sample is not contaminated.
5. In difficult conditions such as loose soil, hard rock and plenty of water exists, sampling can be done well.
