Specifications
NM Series High Air Pressure DTH Hammers Without Foot Valve Technical Data |
| Length(Without Bit) | NM4A | NM5A | NM6A | NM8A |
| 1005mm | 1110mm | 1161mm | 1338mm |
| Weight(Without Bit) | 40.00kg | 68.50kg | 90.00kg | 176.00kg |
| External Diameter | Ø99mm | Ø126mm | Ø142mm Ø144mm Ø146mm Ø148mm | Ø180/Ø185mm |
| Bit Shank | NM4 | NM5 | NM6 | NM8 |
| Hole Range | Ø110-Ø135mm | Ø155-Ø190mm | Ø155-Ø203mm | Ø195-Ø254mm |
| Connection Thread | API2 3”/8REG | API2 3”/8REG API3 1”/2REG API2 7”/8REG | API3 1”/2REG API2 7”/8REG 2 7”/8 IF | API4 1”/2REG |
| Working Pressure | 1.2-2.0Mpa | 1.3-2.3Mpa | 1.5-2.5Mpa | 1.5-3.0Mpa |
| Impact Rate at 17 Bar | 30HZ | 28HZ | 25HZ | 22HZ |
| Recommended Rotation Speed | 25-40r/min | 20-35r/min | 20-30r/min | 15-25r/min |
| Air Consumption | 1.0Mpa:5.0m³/min 1.8Mpa:9.0m³/min 2.4Mpa:14.0m³/min | 1.0Mpa:7.0m³/min 1.8Mpa:14.0m³/min 2.4Mpa:19.0m³/min | 1.0Mpa:9.0m³/min 1.8Mpa:18.0m³/min 2.4Mpa:26.0m³/min | 1.0Mpa:12.0m³/min 1.8Mpa:22.0m³/min 2.4Mpa:28.0m³/min |
Feature Advantage
1. Price commitment: in order to ensure the high reliability of
products, raw material selection are using grapefruit brand
products; under the same competitive conditions, and not to reduce
product technical performance on the basis of sincerity at a
favorable price to customers.
2. Quality commitment: product manufacturing and testing have quality
records and inspection data; the performance of the product can
withstand customer inspection.
3. Customer service: in order to create new diamond brand, enhance
the visibility of enterprises, establish corporate image, we serve
customers with the principle of "preferential prices, good service,
reliable product quality" principle.
The appearance of the picture is different from that of the actual
product, and the actual product is the standard.
| NM Series High Air Pressure DTH Hammers Without Foot Valve |
| Item Description | Weight(kg) |
| NM4A | NM5A | NM6A | NM8A |
| Top Sub | 6.50 | 13.70 | 20.00 | 34.00 |
| “O” Ring Of Top Sub | 0.10 | 0.015 | 0.015 | 0.015 |
| Breakout Ring | - | - | - | 0.30 |
| Chenck Valve | 0.35 | 0.70 | 0.70 | 1.20 |
| Spring | 0.05 | 0.10 | 0.10 | 0.10 |
| Air Distributor | 1.50 | 2.00 | 3.50 | 6.00 |
| Internal Cylinder | 2.10 | 2.80 | 4.20 | 6.50 |
| Piston | 8.50 | 15.00 | 23.00 | 42.50 |
| External Cylinder | 14.80 | 24.00 | 26.00 | 61.00 |
| Guided Sleeve | 1.80 | 2.60 | 4.80 | 5.30 |
| “O” Ring Of Stop Ring | 0.005 | 0.01 | 0.01 | 0.01 |
| Stop Ring | 0.30 | 0.70 | 0.80 | 1.50 |
| Breakout Ring | - | - | - | 0.30 |
| Drive Chuck | 3.80 | 6.50 | 4.20 | 17.30 |
| Drill Bit | 6.60 | 13.50 | 23.00 | 31.00 |
Description
Down the hole rock tools (drilling tools) are rock drilling
equipment which takes compressed air as power source to partially
transfer impact power into drilling holes. An air distributing
device in a top hammer controls a piston to move back and forth. An
impact device arranged in the front of the top hammer transfers the
impact powderto a down-the-hole bit to crush rocks.
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.
Applications
Widely used in mines, quarries, earthworks and other engineering
drilling blasting hole, guardrail hole, mountain reinforcement,
anchorage and other engineering holes, geothermal exploration hole,
Well bore and other fields.
