Concave Face 216mm 8 1/2'' Black Color DTH Drill Bit For Mining
Product description
Penetraton rates with down-the-hole hammers are directly
proportional to air pressure and, therefore, increasing the
pressure will increase the drilling speed. Modern valveless hammers
are products of precision engineering and are of a strong
robustdesign with few internal parts making them economically
attractive and easy to service. Air pressure is applied
alternatively to both ends of the hammer piston by means of a
system of ports and channels in the piston and cylinder to change
the direction of the air. The valveless hammer operating cycle is
described in the previous pages. DTH hammers are primarily
percussion tools and penetrate more by shattering materials than by
tearing it. The same air which passes through the hammer causing
the piston to reciprocateand strike the bit also serves to expel
cuttings from the bore hole and therefore maximumutilisation of the
air is achieved.
SD8 216mm 8 1/2'' DTH Drill Bit overview
| Bit Diameter | 216mm 8 1/2'' |
| No.* Button Dia. mm | Gauge Buttons 10*18mm |
| Front Buttons 8*18mm + 6*16mm |
| Weight (kg) | 51.2 |
SD8 series DTH bit overview
| Diameter | Button Configure Dia*qty. | Bit design | Weight (kg) |
| Metric | Inch | Guage button | Front button |
| 203mm | 8'' | 18mm*10 | 18mm*8+16mm*5 | Concave face | 40.1 |
| 216mm | 8 1/2'' | 18mm*10 | 18mm*8+16mm*6 | Concave face | 44.3 |
| 219mm | 8 5/8'' | 18mm*10 | 18mm*8+16mm*6 | Concave face | 44.8 |
| 229mm | 9'' | 18mm*12 | 16mm*12+16mm*7 | Concave face | 46.4 |
| 235mm | 9 1/4'' | 18mm*12 | 16mm*12+16mm*7 | Concave face | 47.4 |
| 245mm | 9 5/8'' | 19mm*12 | 16mm*12+16mm*8 | Concave face | 51.5 |
Product Advantages
1. 1. High grade tungsten carbide inserts
2. Bit bodies manufactured from high grade steel and processed
using state-of-the-art CNC machinery and heat treatment
3.Multiple shank and face designs Various face and spline
configurations
4.Perfect after-sales service. Free replacement is provided if
there is quality problem with our products..
Face shape Features
Concave Face
1. Capable of drilling straighter holes in medium to hard rock
which is broken or less consolidated
2. Offers high penetration rate in the above stated rock conditions
3. Has excellent air flushing characteristics
4. Predominant face style for majority of drilling conditions
Flat Face
1. Have a superior performance in hard, abrasive and broken rock
conditions
2. They however have a slower penetration rate in comparison to a
concave face bit
Convex Face
1. This face has been designed to offer high penetration rate in
soft rock such as shale, limestone etc
2. They are recognized for having excellent capability for drilling
into moderately consolidated rock conditions
Structure picture
Product application
At present, DTH drilling tool is widely used in underground mining,
quarries, hydraulic and Hydro-Power Engineering, water well
drilling, Mineral exploration, anchoring hole drilling, geothermal
engineering, Subway excavation, another civil engineering.
DTH is one of the most efficient ways of drilling rock, using a
rapid hammer action to break the rock into sizeable chips which are
then evacuated from the bore hole by the air exhausted from the DTH
Hammer. The technique provides fast drilling of accurately aligned,
straight and clean holes in most ground conditions.
Company informaiton
1. Our factory has been specialized in manufacturing drilling tools
and spare parts for over 10 years.
2. We have advanced technology and equipment.
3. Our technician has more than 13 year's professional working
experience.
