When percussion or hammer drilling the percussion mechanism is
called a DTH or down the hole hammer. This drilling tool is located
directly above the down hole hammer bit. The driller transfers
weight to the bit through the drill pipe as well as provides some
rotation. Through the use of a compressor, the pressurized air is
forced to the down hole hammer. As the drilled hole gets deeper the
driller adds more drill pipe to the string. The piston strikes the
impact zone of the hammer bit; hammers are always used as part of a
casing advancement system and can be used in reverse circulation
applications. DTH hammers are common when drilling blast holes and
It is mainly used in geological exploration, coal mine, water
conservancy and hydropower, highway, railway, bridge, construction
and so on.
NQL Series High Air Pressure DTH Hammers With Foot Valve
|Connection Thread||API2 3”/8REG|
2 7”/8 IF
|Impact Rate at 14 Bar||27HZ||25HZ||23HZ||20HZ|
|Recommended Rotation Speed||25-40r/min||25-40r/min||20-30r/min||15-25r/min|
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.
|NQL Series High Air Pressure DTH Hammers With Foot Valve|
|“O” Ring Of Top Sub||0.01||0.015||0.02||0.02|
|“O” Ring Of Stop Ring||0.01||0.01||0.02||0.02|