3 inch High Air Pressure Rock Drilling Tool DTH Hammer DHD3.5 COP32
Applications
1. Underground mining
2. Quarry benching operations
3. Water well drilling
Our DTH Hammer and Bit - Fully Compatible with Atlas Copco,
drilling rigs, industry leading manufacturer of drilling tools in
China.
| Hammers Size | Bit Shank | Hole Range |
| 2" | BR2/HD25 | 70-90mm |
| 3" | DHD3.5/COP32/COP34/QL30/M30/BR3/BR33/XL3/Mach303 | 90-110mm |
| 4" | DHD340/COP44/QL40/SD4/M40/
Mach44/TD40(COP44 gold) | 110-135mm |
| 5" | DHD350/COP54/QL50/SD5/M50 | 135-155mm |
| 6" | DHD360/COP64/QL60/SD6/M60/TD60 (COP64 gold) | 155-190mm |
| 8" | DHD380/COP84/QL80/SD8/M80 | 195-254mm |
| 10" | SD10/NUMA100 | 254-311mm |
| 12" | DHD1120/NUMA120/NUMA125 | 305-445mm |
DTH молоток/DTH hammer/ค้อน DTH/Down The Hole Hammers/Abajo los
martillos del agujero/Por el agujero Martillos/Martillos
DTH/Herramientas de martillo DTH/เครื่องมือค้อนทุบ DTH/DTH Hammer
Tools
Selecting the right hammer
The optimum range of hole size for blast hole drilling with DTH is
90 mm to 254 mm (3 ½"–10"). Smaller blast holes are generally
drilled using tophammer, and larger holes generally use rotary
machines. In other applications, like foundation drilling, DTH
hammers can be used with single bit in hole sizes up to 750 mm
(30"). With multiple hammer units CD (Cluster drills) drill holes
up to 70" or 1778 mm.
As a rule of thumb, the smallest hole diameter a DTH hammer can
drill is its nominal size. A 4 inch hammer will drill a 4 inch (102
mm) hole. The limiting factor is the outside diameter of the
hammer, because, as hole diameter reduces, airflow is restricted.
Maximum hole size for production drilling is the nominal hammer
size plus 1 inch, so for a 4 inch hammer the maximum hole size is 5
inch (127–130 mm).
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. Scope of
application:Mining, quarry, road building, well hole drilling,
blasting, landslide prevention, dam reinforement, anchoring,
geothermal, hydrology, etc.
