Down the Hole (DTH) Drilling

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Down-the-hole drilling is to drive the hammer behind the drill bit by compressed air by means of the drill pipe. The piston strikes a little bit straight, while the hammer external cylinder provides direct as well as steady guidance of the drill a little bit. This makes the effect of power not lost in joints and enables much deeper percussion drilling.
Furthermore, the influence force acts on the rock at the bottom of the hole, which is a lot more efficient, as well as straighter than other techniques of the drilling procedure.
And DTH is preferable for the large hole of acid rock drilling, special for rock hardness over 200Mpa. Nevertheless, for the rock listed below 200 MPa, it will not just be energy waste, yet likewise reduced drilling efficiency, and significant wear to the drill a little bit. It's because while the piston of the hammer strike, the soft rock can not absorb the impact totally, which seriously lowers the effectiveness of drilling and slagging.

When is it made use of?

&#; In theory, drilling depth is restricted by back stress just (can be approximately numerous kilometers).

&#; The most appropriate hole diameter is 100-- 254 mm, in unique applications, can be approximately 2M And the minimum can be around 50 mm as well.
&#; Mostly use pressurized air for slag flushing and in some cases air foam for a unique application.

&#; Adapt to hard rock and rock formation problems (compared to top hammer).
&#; Drilling straightness is best in these two techniques.

&#; Very reliable in hard rock boring (contrasted to the rotating drilling).

Top Hammer Drilling

The percussive pressure of the top hammer drilling produced by the piston of the pump in the hydraulic drilling gear is transmitted to the drill bit via shank adaptor and drill pipe, This is the distinction between DTH drilling. On the other hand, the percussion system drives the drilling system rotation. When the stress wave gets to the drill bit, the energy is transmitted to the rock in the form of a little bit of infiltration. The mix of these features allows drilling openings right into the hard rock, and the air compressor just executes dirt elimination and slagging in top hammer drilling.
The combination of these features allows drilling openings right into the acid rock, and the air compressor only executes dust elimination and slagging in top hammer drilling.
Influence energy increased by influencing regularity with each other develops the percussive outcome of the drifter. However, typically, top hammer drilling is utilized for a hole diameter optimum of 127mm, and an opening depth of less than 20M, which is high performance.

When is it made use of?

&#; One of the most appropriate opening sizes is between 25-- 127 mm.
&#; Adapt to stable and uniform acid rock.

&#; Generally, the hole's deepness is less than 25 meters.
&#; The majority easily skew in these 2 drilling methods.
&#; The slag flushing medium is compressed air or water.
&#; High efficiency in shallow holes drilling, the much deeper the lower performance.

With competitive price and timely delivery, KSQ Technology sincerely hope to be your supplier and partner.

We offer DTH Drilling Rig and Tophammer Drill Rig, please contact us if you need them.

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Roxar top hammer rock drill or DTH Hammer?

If you&#;re considering shopping for a brand new drill for your project or company, there are a broad variety of elements to require into thought before making the decision. Rock typology, budget, mining or quarrying site configuration, anticipated future applications, noise, desired hole dimensions, existing machines and available time are all factors that you simply should take under consideration before considering that purchase.

We&#;re about to define a number of the main variations between hydraulic top hammer rock drills (drifters), and down the hole (DTH drills) or in the hole (ITH drills).

The mechanical distinction between the 2 sorts of drills is where the hammer is located within the equipment. The percussive devices (hammers) apply cyclical shock waves to the drill bits. In the case of down the hole drills, the percussive device is placed in direct contact with the bit, and is therefore &#;down-the-hole&#;. Top hammer rock drills, however, apply these repeated shock waves at the top of the drill string, outside of the bore.

While the main overall distinction between the 2 equipments is that top hammer rock drills are more efficient at depths up to 40 m deep and really faster, it\&#;s important to also consider the fact that the operating cost of DTH drills is often higher. Both kind of drill can be operated in soft and medium as well as hard ground while top hammers drifters perform better in very hard rock, particularly in fractured hard rock. Neither rock drill, however, has an excellent performance in soft ground, in this case the accurate choice would be to consider a rotary drill.

DTH drills are usually powered with pressurized air, the overall system efficiency is very low, becoming gradually lower when the drilling depth increases. Top hammer rock drills use hydraulic energy with a very high system efficiency which remain unchanged in any drilling conditions. But DTH drills are more mechanically efficient as less energy is lost in the transmission of shock waves from the hammer to the drill bit. While in top hammer rock drills, part of the energy is lost going down the way along the drill steel. This repeated shock waves from the hydraulic hammer on couplings and rods of top drifter drill strings gradually wear those components, meaning that top hammer drills usually require more consumables in the long run. The new drifter unique technology that Roxar has recently introduced contributes to avoid the fast wear of the drill steel thanks to the automatic adjustment of the frequency / energy ratio. With Roxar drifters, the stress on the drill string is drastically reduced allowing a longer life span of the shank adapter, the couplings, the rods and the drill bit.

Hydraulic top hammer drills are better adapted to narrow and short bores (up to 40 m), they drill quicker and much more efficiently than DTH drills. One important drawback of DTHs is that their minimum hole diameter is about 3.½\&#;, while top hammer drifters are able to drill holes with diameter as low as 1\&#;.

Because the drifter stays outside the hole while drilling, top hammer drills have no risk to remain stuck inside the hole during drilling operations, their life span is also much longer than DTH drills. Hydraulic top hammer rock drills are usually less accurate than DTH drills but they can incorporate anti-jamming devices like Roxar reverse percussion which reduce jamming risk.

If you&#;re looking for high drilling speed and low operation cost, in fractured rock as well as in hard rock, top hammer drifters, like Roxar drifters, are the way to go.

Roxar experts are skilled and experienced in supporting equipment manufacturers and customers with selecting the perfect drill for their equipment or specific applications. We understand that each application is completely different and every customer has unique factors to consider when selecting a rock drill. Get in touch with Roxar and we will analyze your requirements and budget to find the best solution.

Learn More about Roxar hard rock drifters:

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