Active Member
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[China]
Address: #1 Building, Hanyu golden Valley, Jingshi East Road, Jinan City, Shandong province, PRC
Contact name:Liu
Sinotechdrill International Co., Ltd |
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High Air Pressure Deep Hole Rotary Pneumatic Drilling DTH hammer
without foot valve
DESCRIPTION:
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 top hammer, 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.
| HAMMER | |
| Recommend bit size | 165-178mm |
| External diameter | 148mm |
| Length excl.thread | 1121mm |
| Hammer weight | 105kg |
| Top sub thread | 3-1/2"API REG |
| Working pressure | 300-350PSI |
| Air consumption | 600-900CFM |
| Piston diameter | 122mm |
| Piston weight | 24kg |
| Feed force | 7-20kN |
| Rotation speed | 25-60rpm |
MAIN FEATURES:
1.It works with valve-free gas distribution, so it can distribute
gas reliably.
2.The piston is simple in construction and is not easily damaged.
3.Fast drilling speed, low gas consumption and low fuel
consumption.
4.Less components used, the structure is simple, and the each parts
are hardened, so the working life is long.The convenient
maintenance with less breakdown.
5.The joint and the card sleeve are connected with the outer
cylinder by a multi-start thread, which is easy to disassemble.
| HAMMER | |
| Recommend bit size | 140-152mm |
| External diameter | 126.5mm |
| Length excl.thread | 1147mm |
| Hammer weight | 71.6kg |
| Top sub thread | 2-3/8"API REG |
| Working pressure | 250-350PSI |
| Air consumption | 500-800CFM |
| Piston diameter | 104mm |
| Piston weight | 17kg |
| Feed force | 6-25kN |
| Rotation speed | 20-70rpm |
According to your requirement, the top sub can be made into two
spanners, and put protection buttons.An air controlling hole can be
drilled on the check valve to provide more efficiency cuttings
discharge.
If you are interested in our products, feel free to contact us.
Sinotechdrill International Co., Ltd
Add: A3-1 building, Hanyu Finance Valley, High-tech Zone
North Road, Jinan City, Shandong Province, China
Phone number&Whatsapp: 0086-18612948866
