32 inch replacement Roller Cone bit core barrel for Rotary digging hole

 Rock Drilling Core Barrels with Roller Bits adopt the high-carbon steel and special drilling bits angle to keep the drilling strength and efficiency.

There are tree types of core barrels:

1)Core barrel with bullet teeth is used for cutting an annular ring in rock or concrete(also reinforced concrete).

2)Core barrel with roller bits is used in very strong rock formations(compressive strength > 100Mpa).

3)Cross cutter core barrel is mainly used to break rock cores which remain in the borehole after using a core barrel, also suitable for drilling hard, jointed rock(<100Mpa) and for penetrating through layers containing boulders.

Applicable layers: dense sand, gravel and medium hard rocks, etc.

The Parameters of Core barrel with roller cone

Hard Rock Core Barrel With Roller Cone Pictures 

Larger Holes with Smaller Rigs - By drilling a hole in stages, larger holes can be drilled with smaller rigs. A smaller hole requires less power.

Replacing Cutters and Cutting Cost - On most Hole Opener designs, the cutters can be easily replaced. The cost to replace a cutter is a fraction of the cost to replace a large tricone rock bit.

Cost of Large Rock Bits - Larger diameter rock bits not only cost a lot, they can be difficult to find. A more economic solution is to use a hole opener that uses smaller tricone rock bit segments..

Flexability - Hole Openers can be fabricated in just about any size, and can be configured to drill through any formation.

Operational Considerations

Drilling Weight - The choice of drilling weight is determined based on the recommendations of the bit manufacturer and the number of cutters on the hole opener.

Number of Cutters - The number of cutters placed on a hole opener is governed by the following facts:

 Maximum number which will fit around the perimeter.

 The greater the number of cutters, the less the weight, which therefore reduces the penetration rate.

 In softer formations, less weight is needed to penetrate.

 The greater the number of cutters, the smoother the tool will run.

 The greater the number of cutters, the greater the cost.

 The greater the number of cutters, the longer the cutters will last