Details Of Middle-Low Hammer
The NBR1A, NBR2A and NBR3A downhole impactors are medium to low pressure impactors that can be matched to BR series drills.
Features Of Middle-Low Hammer:
1. Adapt to the working wind pressure of 0.7-1.75Mpa.
2. valveless hammer.
3. Simple structure, easy disassembly and long life.
4. High impact power and fast drilling speed
5. Low air consumption and low energy consumption. When it is necessary to increase the slag discharge, the hole can be drilled in the check valve.
Specification Of NBR Series DTH Hammer
| Item Description | Weight(kg) | ||
| NBR1A | NBR2A | NBR3A | |
| 1、Top Sub | 1.7 | 2.6 | 5.2 |
| 2、“O” Type Ring | 0.1 | 0.1 | 0.1 |
| 3、Chenck Valve | 0.1 | 0.1 | 0.1 |
| 4、Spring | 0.05 | 0.05 | 0.2 |
| 5、Air Distributor | 0.8 | 0.6 | 0.8 |
| 6、Internal Cylinder | 0.8 | 0.8 | 1.3 |
| 7、Piston | 1.2 | 3.8 | 5.5 |
| 8、External Cylinder | 4 | 4.5 | 9.5 |
| 9、Guided Sleeve | 0.15 | 0.6 | 1 |
| 10、“O” Ring Of Stop Ring | 0.005 | 0.005 | 0.05 |
| 11、Stop Ring | 0.1 | 0.1 | 0.15 |
| 12、Drive Chuck | 0.8 | 1.2 | 2 |
| 13、Drill Bit | 1.7 | 2.5 | 4 |
| Technical Data | |||
| Length(Without Bit) | NBR1A | NBR2A | NBR3A |
| 760mm | 880mm | 889mm | |
| Weight(Without Bit) | 10.00kg | 14.50kg | 26.00kg |
| External Diameter | Ø54mm | Ø62mm | Ø82mm |
| Bit Shank | BR1 | BR2 | BR2 |
| Hole Range | Ø64-Ø76mm | Ø70-Ø90mm | Ø90-Ø110mm |
| Connection Thread | Br40,BOX | Rd50,BOX | API2 3”/8REG |
| Working Pressure | 1.0-1.5Mpa | 1.0-1.5Mpa | 1.0-1.5Mpa |
| Impact Rate at 14 Bar | 27HZ | 25HZ | 25HZ |
| Recommended Rotation Speed | 25-40r/min | 25-40r/min | 25-40r/min |
| Air Consumption | 0.7Mpa:1.5m³/min | 0.7Mpa:2.5m³/min | 0.7Mpa:4.0m³/min |
| 1.0Mpa:2.5m³/min | 1.0Mpa:4.0m³/min | 1.0Mpa:6.0m³/min | |
| 1.4Mpa:3.0m³/min | 1.4Mpa:5.0m³/min | 1.4Mpa:8.0m³/min | |
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