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Rock Crashing Drilling Tools Spare QL Shank DTH Hammer QL60 Parts Piston
Adriller Down The Hole drill bit s are produced from premium quality alloy steel for increased durability and wear characteristics.
Specific heat treatment standards and special "stress relief" processes ensure consistent performance.
Adriller DTH hammer bits are designed for maximum performance and hole cleaning ability and high penetration rate.
Applications:
Mining / Blast Hole
Quarry
Avalanche Barrier & Forest Roads
Know How Tips
Many potential problems in down-the-hole drilling can be avoided by taking
care to get the basics right. It comes down to the right tools and settings for
the conditions, and proper care of equipment. Here are my tips for drilling
further without hassle.
RIGHT FACE
First off, choose the right face design for the type of rock and your drilling priorities (e.g. tool lifetime, penetration rate, etc). Flat face works well for most rock conditions and is especially good in fractured, fissured and mixed rock formations. Concave face is the most straightforward to operate and another good all-rounder, as well as being particularly suitedto deep hole drilling with high accuracy. Convex face gives a high penetration rate in softer to medium-hard rock
RIGHT BIT
One of the most important issues when it comes to bit selection is choosing a bit large enough to allow cuttings to get around the hammer and out of the hole. An undersized bit will slow you down, as well as creating backpressure that shortens the life of carbides. It’s also important to start with the right carbide, bearing in mind that the tougher compounds can extend the lifetime of the bit by 2-5 times depending on the conditions.
XT48 works for most drilling conditions and should be the first choice if there’s any uncertainty about the rock type. DP65 is the right choice for hard, abrasive conditions, and DP55 in ballistic configurations gives fastest overall drilling in softer to medium-rock
RIGHT SETTINGS
Two of the biggest challenges in DTH drilling are feed pressure and rotation. To get feed pressure right, gradually increase until you reach maximum operating air pressure. You now have optimum feed pressure and do not need to increase further. When it comes to rotation, it’s all about finding the happy medium. Too slow and productivity suffers. Too fast and you get excessive carbide wear.
But there’s an easy way to find the right speed, using just the air pressure gauge on the drill and a stopwatch!
First, gradually accelerate until you get an increase in penetration rate. Continue until the penetration rate no longer increases. You have now reached optimal rotation speed.
Carbide wear gives a good clue to rotation. The wear should be centered. A worn leading edge indicates too high rotation speed. A worn trailing edge indicates the speed is too low.
Adriller DTH Hammer Data
DTH HAMMER Technical data | ||||||||
Size | Length | Weight | Out Diameter | Borehole Range | Threaded | Working Pressure | Recommended Speed | Air Consumption |
3.5 inch | 888mm | 25KG | φ82 | φ90-φ115 | API2 3/8"Reg | 1.0~1.5Mpa | 25-40r/min | 6m³/min |
4 inch | 1012mm | 40.00KG | φ99 | φ105-φ130 | API2 3/8"Reg | 1.2~2.0 Mpa | 25-40r/min | 6m³/min~14m³/min |
5 inch | 1090mm | 67.00KG | φ126 | φ138-φ165 | API2 7/8"Reg | 1.3~2.3Mpa | 20-35r/min | 7m³/min~19m³/min |
6 inch | 1182mm | 90.00KG | φ146 | φ150-φ185 | API3 1/2"Reg | 1.5~2.5Mpa | 20-30r/min | 9m³/min~28m³/min |
8 inch | 1330mm | 174.00KG | φ180 | φ203-φ254 | API4 1/2"Reg | 1.5~3.0Mpa | 15-30r/min | 12m³/min~24m³/min |
10 inch | 15215mm | 316.00KG | φ226 | φ254-φ305 | API6 5/8"Reg | 2.0~3.5Mpa | 20-35r/min | 18m³/min~65m³/min |
12 inch | 1860mm | 480.00KG | φ275 | φ305-φ445 | API6 5/8"Reg | 2.0~3.5Mpa | 15-25r/min | 28m³/min~71m³/min |
