General Introduction:
Raise Bore Drilling is extremely safe and economical drilling method to open large diameter holes to the surface or one underground level to another, typically used in mining operations, to excavate a circular hole between two levels of a mine without the use of explosives, or constructing ventilation shafts, ore passes, manways and penstocks. Raise bore drilling is quite versatile and has gained worldwide acceptance as the preferred rotary drilling method at mines, power generation plants and civil infrastructure projects.
The mostly used raise bore method is pre-drilled pilot-hole reaming, in which a raise bore machine is set up on the upper level of the two levels to be connected. A pilot hole is drilled by a sealed bearing pilot tricone bits to the lower level. Once the drill string has broken into the opening on the target level, the pilot bit would be removed and a reamer head with roller cutters, of required diameter of the excavation, is connected to the drill string and raised back up towards the raise bore drilling machine. The debris and cuttings from the reamer head during drilling fall on to a truck prepared on the floor of the lower level.
Acdrills’ Raisebore Roller Cutters are designed and manufactured for a wide range of reaming heads, varying in sizes from 0.6 to 12 meters in diameter, to be used in, from horizontal TBM boring to vertical drilling, either pre-drilled pilot hole raise bore reaming or blind shaft sinking boring types. Designed for optimum performance in all types of rock formations with varying spacing between the rows of tungsten-carbide inserts, the roller cutters are engineered for many type of Raisebore Head configuration. The G and N Roller Cutters, can be used in variable space combination on any one reaming head, which delivers better rates of penetration as well as increased toughness. These cutters are designed and manufactured using the latest technology and will deliver optimum performance.
Besides, by analyzing the given geological rock formation information of the ground and the type of raise bore machines parameters to be used, Acedrills can re-design the most appropriate raise bore rollers with optimum cutter configuration and most suitable cutting spacing to ensure that the highest penetration rate combined with longest service life, so as to minimize the cost per cubic meter for driller.
Specifications and Operating Parameters Overview:
|
Type
|
360G&N
|
300G&N
|
300R
|
200R
|
|
Gage Diameter
|
14” (360mm)
|
12”(305mm)
|
12”(305mm)
|
8”(203mm)
|
|
Load per Cutter
|
20,000 ~ 55,000 lb
(89 ~ 245 kN)
|
20,000 ~ 50,000 lb
(89 ~ 222 kN)
|
20,000 ~ 40,000 lb
(89 ~ 178 kN)
|
20,000 ~ 35,000 lb
(89 ~ 156 kN)
|
|
Max. Load
|
60,000 lb
(267 kN)
|
55,000 lb
(245 kN)
|
45,000 lb
(200 kN)
|
40,000 lb
(175 kN)
|
|
Bearing
|
Metal Face Sealed Bearing, Roller–Ball–Roller
|
|
Mounting
|
Saddle
|
|
Fastener
|
Bolt
|
|
Cutting Structure
|
Tungsten Carbide (TCI)
|
|
Max. Linear Speed
|
300 ft/min (91.44 m/min)
|
Note: Special sizes may be available upon request.
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How to order?
Cutter Dimension + Mount Design
As well as collect the following information if possible:
1, Raise Boring Machine Information;
2, rock formation condition;
3, roller cutters performance statistics.