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.
| 4" hammer size 110-135mm connection thread | |
| Top Sub | 6.50kg |
| "O"Ring of Top Sub | 0.01kg |
| Check Valve | 0.42kg |
| Spring | 0.04kg |
| Compression Buffer | 0.04kg |
| Air Distributor | 2.20kg |
| Internal Cylinder | 2.30kg |
| Piston | 9.00kg |
| External Cylinder | 15.00kg |
| "O"Ring of Stop Ring | 0.01kg |
| Stop Ring | 0.20kg |
| Drive Chuck | 3.50kg |
| Drill Bit | |
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.
| 6" hammer size 155-190mm connection thread | |
| Top Sub | 20.00kg |
| "O"Ring of Top Sub | 0.02kg |
| Check Valve | 1.00kg |
| Spring | 0.10kg |
| Compression Buffer | 0.10kg |
| Air Distributor | 6.00kg |
| Internal Cylinder | 5.00kg |
| Piston | 23.50kg |
| External Cylinder | 31.00kg |
| "O"Ring of Stop Ring | 0.02kg |
| Stop Ring | 0.60kg |
| Drive Chuck | 5.40kg |
| Drill Bit | |
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 Gold Valley, High-tech Zone
North Road, Jinan City, Shandong Province, China
Tel: 0086-531-58190127
