Description
Applicable formation: Class II, III and IV surrounding rocks, Natural Compressive Strength of Formation 80-120 Mpa, high compressive strength, medium-hard, thick hard interbeds, such as hard shale, limestone, sandstone, dolomite, gneiss, conglomerate, etc.
■ Product features: Cutting teeth are elongated conical spherical teeth, and the outer row is high strength spherical teeth. O-ring rubber seal, new bearing system, new grease storage compensation pressure balance system.
■ Recommended drilling pressure：200KN~350KN
Rotary Excavation Bits — LX617RG & LX617RE Series
Heavy-Duty Roller Cone Cutters for Foundation Drilling, Shaft Boring, and Large-Diameter Rotary Excavation
Models: LX617RG / LX617RE
Application: Rotary Excavation / Large Hole Boring
Excavation Range: 0.8m – ≥2.0m
Key Performance Advantages for Large-Diameter Excavation:
- Flexible Cutterhead Matching: Engineered to adapt dynamically across small (0.8–1.5m), medium (1.5–2.0m), and large (≥2.0m) cutterhead diameters.
- Optimized RPM Control: Controlled rotational speed thresholds (ranging from ≤10 RPM to 16 RPM) ensure peak mechanical energy transfer and prevent premature bearing wear.
- High-Density Roller Cutter Layout: Supports multi-cutter configurations from 6 up to 14+ roller cones to optimize rock-crushing torque and penetration efficiency.
Product Overview & Technical Description
The LX617RG and LX617RE Rotary Excavation Bits are heavy-duty roller cone cutter assemblies designed for continuous operation in large-diameter foundation drilling, shaft sinking, and trenchless excavation equipment.
Built with high-alloy steel matrix structures and wear-resistant tungsten carbide inserts (TCI), these cutters are configured onto rotary cutterheads to break hard rock through crushing and shearing action. Matching the proper number of roller cutters with controlled cutterhead RPM enables maximum Rate of Penetration (ROP) while extending downhole component service life.
Technical Specifications — LX617RG Series
| Excavation Diameter (m) | Cutterhead Speed (RPM / min) | Installed Roller Cutters Quantity | Operational Notes |
|---|---|---|---|
| 0.8 – 1.5 m | 12 – 16 RPM | 6 – 12 Cutters | Higher rotation speed for fast ROP in smaller diameters |
| 1.5 – 2.0 m | 10 – 12 RPM | 10 – 14 Cutters | Balanced speed and density for intermediate reaming |
| ≥ 2.0 m | ≤ 10 RPM | ≥ 14 Cutters | High torque & thrust configuration for large-diameter shafts |
Technical Specifications — LX617RE Series
| Excavation Diameter (m) | Cutterhead Speed (RPM / min) | Installed Roller Cutters Quantity | Operational Notes |
|---|---|---|---|
| 0.8 – 1.5 m | 12 – 16 RPM | 6 – 12 Cutters | Optimized for compact bored pile and reaming heads |
| 1.5 – 2.0 m | 10 – 12 RPM | 10 – 14 Cutters | Uniform load distribution for medium rock formations |
| ≥ 2.0 m | ≤ 10 RPM | ≥ 14 Cutters | Heavy-duty layout for maximum rock crushing efficiency |
Field Problems Solved by LX617 Series Cutters
1. Problem: Uneven Cutter Wear in Large Diameter Boring
Solution: Scaling the number of installed cutters up to 14+ on larger diameters ensures uniform force distribution across the entire cutting face.
2. Problem: Bearing Overheating at High Peripheral Speeds
Solution: Lowering cutterhead RPM to ≤10 RPM for diameters ≥2m keeps peripheral linear velocity within safe limits, protecting roller bearings from thermal failure.
3. Problem: Rapid Wear in Abrasive Hard Rock Strata
Solution: High-impact tungsten carbide tooth geometry provides maximum fracture energy against hard granite, limestone, and sandstone layers.
4. Problem: Cutterhead Vibration & Torque Spikes
Solution: Balanced spacing of 6 to 14+ roller cones reduces stick-slip behavior, ensuring continuous and smooth rotation during deep excavation.
Recommended Operating Guidelines
To ensure optimal crushing performance and long cutter lifespan when operating LX617RG & LX617RE series bits:
- Speed Control: Always restrict cutterhead speed according to excavation diameter—do not exceed 10 RPM for diameters over 2.0 meters to protect the cutter bearings.
- Thrust & Weight Management: Ensure steady hydraulic thrust to allow tungsten carbide inserts to penetrate and spall the rock efficiently without impact spiking.
- Cutter Inspection: Regularly monitor shell wear, spin freedom, and bearing seal integrity between drilling passes.
Frequently Asked Questions (FAQ)