Description
Choosing the right hammer is largely determined by hole size and
type of rock formation. Ideally, the size of the hammer should
match the required hole dimension as closely as possible, leaving
just enough space for cuttings to evacuate the hole.
1. according to China's mining conditions, to absorb the advanced
technology of domestic and foreign impactor and design and
manufacture of the latest products.
2. reasonable selection of materials, advanced manufacturing
technology, quality assurance perfect.
3. has higher drilling speed.
4. can provide hardening treatment in order to prolong the service
life and reduce the cost of use.
5. single impact power is large, and the power consumption of
broken rock is low.
6. piston and bit weight to have the best momentum transfer.
7. the modern theory is adopted in the structural design, which
makes the stress wave duration longer, the stress amplitude is
lower, and the piston life is long.
Applications
It is mainly used in geological exploration, coal mine, water
conservancy and hydropower, highway, railway, bridge, construction
and so on.
Specifications
ND Series High Air Pressure DTH Hammers Without Foot Valve Technical Data |
| Length(Without Bit) | ND55C(A) | ND65A | ND75A | ND85A | ND1120A |
| 1102mm | 1238mm | 1258mm | 1359mm | 1880mm |
| Weight(Without Bit) | 68.00kg | 98.00kg | 120.00kg | 175.00kg | 474.00kg |
| External Diameter | Ø126mm | Ø142/Ø146mm | Ø165mm | Ø180/Ø185mm | Ø275mm |
| Bit Shank | ND55C/DHD350Q | COP64/DHD360 | COP64/DHD360 | COP84/DHD380 | CDHD1120 |
| Hole Range | Ø135-Ø155mm | Ø155-Ø203mm | Ø175-Ø216mm | Ø195-Ø254mm | Ø305-Ø445mm |
| Connection Thread | API2 3”/8REG API3 1”/2REG API2 7”/8REG | API3 1”/2REG | API3 1”/2REG | API4 1”/2REG | API6 5”/8REG |
| Working Pressure | 1.3-2.3Mpa | 1.5-3.0Mpa | 1.5-3.0Mpa | 1.5-3.0Mpa | 2.0-3.5Mpa |
| Impact Rate at 17 Bar | 28HZ | 25HZ | 23HZ | 22HZ | 20HZ |
| Recommended Rotation Speed | 22-35r/min | 20-30r/min | 20-30r/min | 15-25r/min | 15-25r/min |
| Air Consumption | 1.0Mpa:8.0m³/min 1.8Mpa:6.0m³/min 2.4Mpa:19.0m³/min | 1.0Mpa:9.0m³/min 1.8Mpa:18.0m³/min 2.4Mpa:26.0m³/min | 1.0Mpa:11.0m³/min 1.8Mpa:20.0m³/min 2.4Mpa:28.0m³/min | 1.0Mpa:12.0m³/min 1.8Mpa:22.0m³/min 2.4Mpa:28.0m³/min | 1.0Mpa:28.0m³/min 1.8Mpa:50.0m³/min 2.4Mpa:71.0m³/min |
| ND Series High Air Pressure DTH Hammers Without Foot Valve |
| Item Description | Weight(kg) |
| ND25A | ND35A | ND45A | ND45S | ND55A | ND55S | ND55C(A) | ND65A | ND75A | ND85A | ND1120A |
| Top Sub | 3.10 | 4.20 | 6.50 | 6.00 | 13.70 | 13.30 | 13.70 | 20.00 | 23.00 | 34.00 | 70.00 |
| “O” Ring Of Top Sub | - | 0.01 | 0.01 | 0.01 | 0.015 | 0.015 | 0.015 | 0.02 | 0.015 | 0.015 | 0.04 |
| Breakout Ring | - | - | - | - | - | - | - | - | - | 0.30 | 0.80 |
| Chenck Valve | 0.10 | 0.20 | 0.35 | 0.30 | 0.70 | 0.70 | 0.70 | 0.70 | 0.70 | 1.20 | 2.00 |
| Spring | 0.05 | 0.02 | 0.05 | 0.05 | 0.10 | 0.10 | 0.10 | 0.10 | 0.10 | 0.10 | 0.10 |
| Air Distributor | 0.60 | 0.80 | 1.50 | 1.30 | 2.00 | 1.90 | 2.00 | 3.50 | 4.50 | 6.00 | 16.00 |
| Internal Cylinder | 0.80 | 1.30 | 2.10 | 1.90 | 2.80 | 2.70 | 2.80 | 4.20 | 6.50 | 6.50 | 25.00 |
| Piston | 3.80 | 5.50 | 8.50 | 7.80 | 15.00 | 14.50 | 15.00 | 23.00 | 28.00 | 42.50 | 113.00 |
| External Cylinder | 4.50 | 9.50 | 15.20 | 14.60 | 24.00 | 23.00 | 25.00 | 31.50 | 40.00 | 60.00 | 173.00 |
| Guided Sleeve | 0.60 | 1.00 | 1.30 | 1.20 | 2.60 | 2.50 | 3.20 | 6.50 | 7.50 | 5.30 | 24.00 |
| “O” Ring Of Stop Ring | 0.005 | 0.05 | 0.01 | 0.005 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
| Stop Ring | 0.10 | 0.15 | 0.30 | 0.20 | 0.50 | 0.50 | 0.50 | 0.60 | 0.80 | 1.20 | 4.00 |
| Breakout Ring | - | - | - | - | - | - | - | - | - | 0.30 | 0.80 |
| Drive Chuck | 1.40 | 1.90 | 3.40 | 3.40 | 6.50 | 6.20 | 4.000 | 6.00 | 8.00 | 17.50 | 46.00 |
| Drill Bit | 3.20 | 5.00 | 9.00 | 8.50 | 16.00 | 15.50 | 15.90 | 26.00 | 28.50 | 40.00 | 140.00 |
