High Efficiency DTH Hammer Water Well Drilling Tools 2 Inch - 12 Inch

Description

Our DTH air hammers have a unique air flow design which maximizes performance. This gives you

more power down the hole, making your investment produce more in less time. The down-the-hole(DTH)

hammer is a pneumatically operated valveless percussion drill. As the name implies, the DTH airhammer

uses air causing the piston to strike the bit producing a very high load during impact, resultingin penetration

through extremely hard formations. This is a different process from the rotary drilling method, which uses

weight and rotation to penetrate softer formations.

Application

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.

Advantages:
- Advanced hammer designs with high power and air efficiency increases productivity
- Tailored product offering covers all your applications and conditions
- Easy service and maintenance designs reduces machine downtime
- Generic and proprietary shank options give you flexibility and reliability

DTH hammers specifications:

General.Operation
Series HD high air-press DTH are designed as a hammer drill. They differ from other rock drills,
however, through continuous operation down against the drill bit.Compressed air is led to the rock drill
thorough the dill tube string. Exhaust air is discharged through hole in the drill bit and used to flush clean
the drill hole. Rotation is delivered from a rotation unit and feed force from the feed is transferred the
DTH drill via the drill tubes.

Technical description.
The DTH dill comprise a narrow elongated tube which contains an impact piston, internal cylinder, air
distributor, check valve. The real, threaded top sub is fitted with a spanner slot and coupling thread for
connection to the drill tubes. The forward part, the driver check, also fitted with thread, enclose the
splines-equipped bit shank and thansfers feed force as well as rotation to the drill bit. A stop ring limits
axial movements of the drill bit. The purpose of the check valve is to prevent impurities from penetrating
the rock drill when pressedair is shut off. During drilling, the drill bit is with drawn inside the DTH and
pressed against the drive chuck. The piston strikes directly against impact surface of the shank of the bit.
Packing&Delivery

FAQ
1. Shipping time for an order
We have many stock. As usual, we can delivery the goods as soon as we get the full payment.
2. Quality Control
Strict inspection and testing for every order before shipping out .
3. How can we trust your company?
We support Alibaba trade insurance. Protect products quality, shipment on time and your covered amount.
4. After Sales Service
Free replacement will provide once the failure confirmed caused by our product quality.