SP781 (ND75A)
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SP781 (ND75A)
DTH Hammer
This Series high air pressure DTH hammer work without foot-valve is designed and developed by our own, which is the one of the most leading DTH hammer in the world.
- Avoid the problem happens on foot valve, fracture, expansion and contraction.
- Lower air comsumption and higher impact frequency. 15-30% higher drilling efficiency than the bit with foot valve.
- Simpler structure and less spare parts, makes easier and cheaper maintenance.
- Heat-hardended spare parts, makes longer serving life and less problem.
- Thread connection for top sub and drive chuck, make easier disassembly.
SP781 (ND75A) Structure
| Ref. | Parts | Weight | Part No. | Ref. | Parts | Weight | Part No. |
|---|---|---|---|---|---|---|---|
| 01 | Top Sub | 31.2 Kg | 01-SP781-01 | 08 | Piston | 34.5 Kg | 01-SP781-08 |
| 02 | “0”Ring | 0.01 Kg | 01-SP781-02 | 09 | Piston Case | 47 kg | 01-SP781-09 |
| 03 | Disc Spring | 0.5 Kg | 01-SP781-03 | 10 | Guided Sleeve | 5.65 kg | 01-SP781-10 |
| 04 | Check Valve | 0.65 Kg | 01-SP781-04 | 11 | Check Ring | 0.02 kg | 01-SP781-11 |
| 05 | Spring | 0.09 Kg | 01-SP781-05 | 12 | Retainer Ring | 1.3 kg | 01-SP781-12 |
| 06 | Valve Seat | 5.5 Kg | 01-SP781-06 | 13 | Drive Chuck | 11.5 kg | 01-SP781-13 |
| 07 | Inner Cylinder | 5.5 Kg | 01-SP781-07 | 14 | Drill Bit | 01-SP781-14 |
Technical Parameter
| Length(Less bit) | Weight | Outer Diameter | Connection Thread | Bit Shank | Hole Range |
|---|---|---|---|---|---|
| 1225mm | 143.5Kg | φ165mm | API3 1/2″REG | ND75A | φ178-φ216mm |
| Work Pressure | Recommended Rotation Speed | Air Consumption | |||
| 1.8Mpa | 2,4Mpa | ||||
| 1.5-2.8 Mpa | 30-60 r/min | 21m³/min | 28m³/min | ||
Contact us
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Email address
info@rockdrillmaster.com
sales@rockdrillmaster.com
Phone numbers
Mobile : +86 188 2419 8826
Our location
Pingjiang Industrial Park, Yueyang,
Hunan Province, China