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DTH Hammer

DTH Hammer

Features:

  • Available for Bits Shanks DHD/QL/MISSION/SD/COP
  • High Air Pressure, High frequency design for fastest penetration rates
  • Without Foot Valve (The drilling speed is higher than the hammer with foot valve), has a strong robust design without foot valve to withstand heavy-duty applications.
    for high performance at low operating air pressures
  • High frequency design for fastest penetration rates
  • Options for open-hole or casing hole projects
  • Premium Alloys & Wear Treatment used for longer-lasting tools
  • Innovative & Simple Design for easy eco kit maintenance
  • API Reg pin connectors are standard.
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DTH HAMMER SPECIFICATIONS

1' , 2' , 3' , 4' , 5' , 6' ,8' , 10' , 12' , 18' , 24' DTH HAMMER

More Specifications Please Contact Our Expert, Click ASK FOR QUOTE

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DTH Hammer manufacturer since 1999

VD DRILL DTH Hammer Advantages

As a specialist manufacturer and supplier of DTH drilling tools, hereby we recommend our newest generation DTH hammer which is improved by art technology, selecting superior alloy steel and robust design. We developed various type of DTH hammer which can be compatible with DHD, COP, QL, MISSION and SD shank of DTH bits and performs very well. It is proved by more than thousands times of tests that our newest Down the hole hammer has a longer life, lower air consumption and higher penetration speed compared to the conventional DTH hammer in the market. In addition, it can work at the air pressure from 6 Bar to 35 Bar(0.6~ 3.5Mpa). Therefore, the newest generation DTH Hammer is very popular among our customers and has a good market share as soon as it launched in the market.

 

  • Simple design of the piston, long life;
  • More efficient energy transfer, faster drilling speed, lower air consumption and lower oil;
  • Fewer internal parts, simple structure, longer life, less failure and easier to maintain because all the parts are heat treated .with it’s robust&durable performance;
  • Easy to disassemble because the top sub, the drive chuck and the external cylinder are connected by multi-step thread.
DTH Hammer manufacturer since 1999

What is DTH Drilling

DTH drilling is a rotary percussive drilling method. a rotary drill rig( A down-the-hole drill, usually called DTH is mainly a pneumatic-powered rock or ground drill), an air compressor, and a “DTH drill string” are necessary equipment. A “DTH drill string” is made up of DTH drill rods, DTH hammers, and DTH bits. DTH Hammer which is used for generating strong impacts is attached to the bottom of the drill string and a drill bit is attached to the lower end of the DTH hammer, so the percussion mechanism follows the bit down into the drill hole. Being one of the essential parts;

DTH hammer converts air pressure into impact energy, sending impact energy and rotation force to DTH bits at the same time, drill pipes transmit the necessary feed force and rotation to the DTH hammer and DTH bit, as well as compressed air for the DTH hammer. Drill pipes are added to the top of the drill string as the hole gets deeper. The movement of the piston in the DTH hammer is caused by high-pressure compressed air. The shock waves that travel to the bit are passed on to the rock mass through the cutting edges or carbide buttons on the bit. The fast hammer impact breaks hard rock into tiny particles, which results in the formation of rock chips, cuttings are removed from the hole by the air circulated from bottom to top to flush the hole.

DTH Hammer manufacturer since 1999

DTH Hammer Overviews

DTH Hammer Means

DTH hammer, also called down the hole ( DTH) hammer, is a kind of pneumatic rock drilling tool, DTH hammer is an integral part of the DTH Rig. the difference from others is during DTH drilling process, down the hole hammer always stays at the bottom of the hole, impacting the rock by bit from hammer directly.

The rotating power acting on DTH hammer comes from rotation motor on the drill rig, the pull force comes from feeding device and transfers the energy to DTH hammer through drill pipe; High-pressure air enters into the DTH hammer through DTH drill rods, then run out from DTH hammer bits, exhaust air is used to blow up cuttings from the bottom of hole; The rapid hammering process shreds hard rock into small fragments and dust, they are then blown away by a fluid, be it air, water, or the drilling mud itself.

DTH Drilling technique was created to drill big holes vertically in ground boring drilling and other industrial applications, such as metallurgy, coal, chemical industry, water conservancy, hydropower, highway, railroad, national defense, construction, and other engineering hole-forming operations.

You should keep the following points in mind while choosing the right DTH hammer for your projects:

Size:
The selection of DTH hammer size is largely determined by the hole diameter and type of rock formation, 3.5 to 10 inches is the best range of blast holes for DTH drilling. Smaller holes are typically drilled with a top hammer rather than a DTH hammer, and larger holes generally use the rotary drilling technique; DTH rigs drill straight holes with less deviation providing more accurate blasting and better fragmentation as a result.

DTH Hammer Basic Structures

DTH hammer components: Piston, internal cylinder, air distributor, check valve and dth button bits accessories are installed in the external cylinder, the external cylinder has the top sub connected with its connection thread & wrench, there has a drive chuck threaded to the other end of cylinder. There is spline in the drive chuck which is mainly used to transfer feeding and rotational force to the drill bit. The stop ring controls the axial movement of the drill bit, and the check valve is used to prevent cutting and other foreign materials ingress into hammer in case of air supply is stopped. During dth hammer drilling, dth drill bit is pushed into the hammer and pressed against the drive chuck, where the piston directly impacts the drill bit for crushing rock. Hammer starts to clean the bottom by blowing up when dth bit lifts from the hole.

 

DTH hammer working principle:

1. Dth bit press against the rock.
2. High-pressure air burst through the check valve from the drill pipe, and enters the front cavity of dth hammer.
3. The increase in the front cavity volume pushes the piston to move upward.
4. When the piston moves up to a certain extent, the front cavity deflates and the compressed air enters the back cavity. The piston keeps moving upward because of inertia.
5. When the piston is to a certain extent, due to the compression of the back cavity and the increase of air pressure, the piston starts to impact downward forming an impact stroke. Moves up circles as the above process to achieve impact and complete down the hole hammer drilling.

 

DTH Hammers Size

Down-the-Hole hammers range from 1 to 24 inches outer Diameter and the DTH bit ranges from 3 to 18 inches in diameter. Premium quality steel combined with quality carbide in the hands of our professional and experienced engineers ensures only the highest quality drilling products. Our dth hammers yield higher penetration on low fuel consumption, even in low air pressure, it gives maximum performance.

Dth hammer outer Diameter : 1 inch, 2 inch, 3 inch, 4 inch, 5 inch, 5.5 inch, 6 inch, 7 inch, 8 inch, 9 inch, 10 inch, 12 inch, 18 inch, 24 inch, etc.

 

DTH hammer Type:

By DTH hammers cutting blowing up way: Conventional DTH hammer & Reverse Circulation DTH hammer (RC hammer).

By down the hole hammers air distribution and structure characteristics: DTH Hammers with valve & DTH Hammers without valve.

By DTH hammers rated working pressure: Low air pressure DTH hammer(rated working pressure < 0.7Mpa), Mid-Low air pressure DTH hammer(0.7Mpa< rated working pressure < 1.5Mpa ), High air pressure DTH hammer (1.5Mpa< rated working pressure< 2.5Mpa), Ultrahigh air pressure DTH hammer (rated working pressure > 2.5Mpa)

By the assorted bit which with or without foot valve: DTH hammers are available for an assorted bit which with foot valve & without foot valve.

By DTH hammers outer diameter: 1 inch, 2 inch, 3 inch, 4 inch, 5 inch, 5.5 inch, 6 inch, 7 inch, 8 inch, 9 inch, 10 inch, 12 inch, 18 inch, 24 inch, etc.

 

DTH Hammers Body Shank:

Suitable for Bits Shanks: DHD/IR/QL/MISSION/SD/COP

 

Working Air Pressure:

Working pressure Standard in metric unit is Bar/pa, there have different units in different countries. In Europe and America, generally use PSI (PSI: Pounds per square inch, P–pound, S-square, I-inch) as a pressure unit.

In China, generally use Kg/cm2 describes Working pressure, so we should know how to exchange pressure in metric. Now we provide three pressure exchanging principles as below:
1bar 14.5psi 1psi~ 0.06895bar 1bar= 0.1mpa=1.0197 Kg/cm

Example: VD 4′ DTH hammers with foot valve, Working pressure is 1.0-2.5 Mpa, exchange to metric unit is 10-25 kg/cm2 as VD 4′ DTH hammer working pressure in metric unit.

Impact Frequency
Impact frequency is the rate of the piston impacting, metric unit is HZ(H).
For example, VD4′ DTH hammer, indicates the impaction frequency as 30HZ In 17 Bar, which means VD4′ DTH hammer’s impaction in per second by 30 times at working pressure 17Bar.

Air Consumption
Air consumption is the pressed air consumed in drilling process, metric unit is m3/min, and there are 2 other units, I/S and CFM. Here we provide the below exchange principle.
1 m3/min=35.4CFM=16.67 I/s

We use the unit of m3/min in specifications. The technical parameters of VD4′ DTH hammer indicate the air consumption is 7,0m3/min by 14Bar input, which means VD4′ DTH hammer consumes around 7.0m3 air when 14Bar per min as input air pressure.

 

DTH Hammer Lubrication:

It is important that the hammer be continuously supplied with a sufficient amount of the right kind of rock drill oil while it is in use.

Inaction will soon result in significant component wear. The piston will immediately seize inside the worn sleeve and cause irreversible damage to both parts if the oil supply is cut off for any reason.

An airline lubrication system should be installed, preferably on the drill rig. The lubricator reservoir should be of sufficient capacity to supply the required volume of rock drill oil for a full shift. With this hammer, this might prove impractical, but the capacity should be sufficient for at least half a shift.

This is equally important that the lubricator system must be adjustable and have a visual check to ensure the lubricator does not run out of oil. The amount of lubricating oil should be increased by 50% when drilling with water or foam. When new drill pipes are added to the drill string, it is recommended that a half pint (a quarter of a liter) of rock drill oil is poured into the pipe to provide an excellent internal coating and helps prevent the hammer from running dry at any time. The grade of rock drill oil will be determined by the ambient temperature at the drilling site. If the ambient temperature is between 0 and 25-degree centigrade, then 30-grade oil should be used. If the ambient temperature is greater than 25-degree centigrade, use 50-grade oil.

 

Instructions for DTH Hammer

1. When the DTH hammer starts drilling, the minimum impact and propulsion force should be used to make the hammer stand against the ground, and open the impact air valve to make the DTH hammer impact work, at this time the hammer does not rotate, DTH drill bit smoothly drill into the rock, and then gradually increase the impact and propulsion force.

2. The thread of the hammer is right-hand. When the rock drilling tools are in the hole, the hammer should always keep the right rotation. Reverse rotation is strictly forbidden to avoid accidents of hammer and drill bit falling into the well.

3. During drilling, keep the hole free of rock slag, and if necessary, carry out strong blowing to clear the hole.

4. When replacing the pressure line and connecting drill pipe, clean the dirt in the pressure and keep the joint of the drill pipe clean to prevent the rock slag and dust from entering the DTH hammer.

5. Reasonable lubrication is the key to ensuring long service life and high efficiency of the hammer, or else it will accelerate the wear of the hammer.

6. During drilling, the dust brought by high-pressure gas, the pollution of the lubricating oil, dust, and mud enters the impactor. It not only reduces the performance of the hammer but also damages the contact surface of each moving part. Therefore, regular maintenance can ensure the continuous and reliable work of the impactor and extend the service life.

DTH Hammer Application:

  • Water Well Drilling
  • Construction and Pile Drilling
  • Exploration Drilling
  • Foundation & Geotechnical and Environmental
  • Mining Drill and blasthole drilling in quarries & mines
  • Mining Exploration & Probing
  • Geophysics
  • Oil & Gas Well Drilling
  • Geothermal boreholes
  • Horizontal directional drilling
  • Utility transmission & distribution rock sockets

 

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One-time business is not our goal, we pursuit for long-term partner relationships.

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  • Email: info@vvdrill.com

Request for quotation for detailed information (MOQ, price, delivery, etc) if you are interested in our rock drilling tools such as tricone bits, pdc bits, drag bits, dth hammer bits etc. We are not just providing simple quotes but experts in selection, calculation.

Welcome to contact us,we will reply within 24 hours.

 

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DTH Hammer manufacturer since 1999

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VD Drill DTH Hammer can match good quality and resonable price in the field

 

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faqs FOR DRILL TOOLS

Frequently Asked Question

What is the Min Order Quantity?

1 pcs

 

How to choose the right DTH Hammer bits?

How to import DTH Hammer bits from China?

First, find a Chinese vendor and make a purchase agreement. Agree on the logistics and transportation methods, for example, by air flight, by sea, or by courier, If you have the ability to clear customs by yourself, you can do it by yourself. If not, the seller can provide double customs clearance services, and you can also find a local agent to help you do clearance work. After finishing clearance work, you can take cargo.

 

How do you guarantee your products quality?

We follow IADC, API,ISO,Use most mordern CNC machines. Accept 1 pcs try order test.

 

What is the delivery time for a new order?

  • For regular products, our delivery time is 1-2 working days at receipt of your payment.
  • For customization products, leading time depends on our production line

 

What payment methods can we use?

Wire Transfer such as TT transfer.

 

Are you manufacturer or trading company？

We are professional Rock Drill Bits Manufacturer, No- Middleman. Such as tricone bits, pdc bits, dth hammer, top hammer bits etc.

And also we are trader as well, specialized in the other rock drilling tools if you want.

 

Do you have own development team?

We have about 90 of senior engineers, professional R & D team, 300 professional production personnel.

 

Whether to carry out quality inspection after production is completed？

We set independent workshop for product inspecting, insure all products pass strict inspection 100% before shipping.

 

Why do we use drill tools to drill?

Water is very important to our human life, we need water in all aspects of food, clothing, housing, and use, if there is no water, our life will be a mess, water is indispensable for us. In ancient times, people’s life was very hard. Most of the ways they got water were directly from lakes or rivers, and some of them got water from mountain springs, but these were always inconvenient. Because sometimes you live far away from home. It was not good for getting water, so people thought of digging a well in the ground to get water. The first drilling tools were very simple and crude.

 

How long will it takes to receive the products after payment?

Depending on the shipping method you choose, if it is air freight, the receiving time is generally within 7-11 days, if you choose sea freight, the receiving time is about 25-45 days.

 

Table of Content

One-time business is not our goal, we pursuit for long-term partner relationships.

Telephone: +86-133 0602 8094

Email: info@drillbitsupplier.com

Request for quotation for detailed information (MOQ, price, delivery, etc) if you are interested in our Rock Drilling Tools such as PDC Inserts Bit or Tungsten Carbide Inserts Bit, DTH Bits… We are not just providing simple quotes but experts in selection, calculation.

Welcome to contact us,we will reply within 24 hours.