Core Barrel Roller Bit
The single roller bit is used as an accessory, which is installed on the barrel drill alternately. It is mainly used in the pile foundation construction of municipal bridges and buildings, and is mostly used in coastal areas.
- 8 1/2 YHA617Y Z01
● Application
50 ~ 130 MPa, Medium, breezed granite, limestone, dolomite, gravel etc. Medium and high compressive strength formation, strong homogeneity, medium and low abrasive formation.
● Feature
| IADC Code: | 6‑1‑7 |
| Bearing: | Journal bearing |
| Sealing: | O‑type rubber seal |
| Cutting structure: | Conical |
| Rows/Qty: | 7/52 |
| Shirttail/Lug | Welding carbide & adding inserts |
● Crashing rock width
114～118mm
● Recommend drilling pressure
Pull‑down on the Cylinder: 20‑30 T ( maximum pull‑down on every single cone bit: 5‑6 T )
● Operating suggestions
| Rock formation | Recommended Drilling Pressure | Recommend ROP | |
|---|---|---|---|
| Hole depth ( m ) | Rotation Speed ( RPM ) | ||
|
Medium hard (50‑100Mpa) |
20‑30t | 0.8‑1.5 | 112‑16 |
| 1.5‑2 | 10‑12 | ||
| 2‑2.5 | 6‑10 | ||
| 2.5‑2.8 | 3‑6 | ||
|
Hard (80‑150Mpa) |
20‑35t | 0.8‑1.5 | 10‑12 |
| 1.5‑2 | 8‑10 | ||
| 2‑2.5 | 5‑8 | ||
| 2.5‑2.8 | 2‑5 | ||
*Note: in the same parameter range, if the cylinder diameter is larger, then rotation speed will be lower. The rated pull‑down on single cone bit is 5‑7 T, rated speed is 60‑100rpm.
- 9 YHA637 Z01
● Application
80 ~ 150MPa, Granite, basalt, quartz porphyry, gravel, etc.Medium and high compressive strength formation, strong formation homogeneity, mixed formation, high abrasive formation.
● Feature
| IADC Code: | 6‑3‑7 |
| Bearing type: | Journal bearing |
| Sealing: | O‑type rubber seal |
| Cutting structure: | Conical |
| Rows/Qty: | 6/42 |
| Shirttail/Lug | Welding carbide & adding inserts |
● Crashing rock width
114～120mm
● Recommend pull‑down
Pull‑down on the Cylinder: 20‑35 T ( maximum pull‑down on every single cone bit: 5‑6 T )
● Operating suggestions
| Rock Formation | Recommend Pull‑down | Recommend ROP | |
|---|---|---|---|
| Hole depth ( m ) | Rotation Speed ( RPM ) | ||
|
Medium hard (50‑100Mpa) |
20‑30t | 0.8‑1.5 | 12‑16 |
| 1.5‑2 | 10‑12 | ||
| 2‑2.5 | 6‑10 | ||
| 2.5‑2.8 | 3‑6 | ||
|
Hard (80‑150Mpa) |
20‑35t | 0.8‑1.5 | 10‑12 |
| 1.5‑2 | 8‑10 | ||
| 2‑2.5 | 5‑8 | ||
| 2.5‑2.8 | 2‑5 | ||
*Note: in the same parameter range, if the cylinder diameter is larger, then rotation speed will be lower. The rated pull‑down on single cone bit is 5‑7 T, and rated speed is 60‑100rpm.