Bearing compressive strength: ≥1800 MPa (three-axis composite load)
Tooth surface hardness: carbide teeth
Dynamic balance accuracy: G2.5 level
Sealing level: IP68
Quick change support: yes
Main body material: carburized alloy forged steel
The roller drill bit is the core rock-breaking tool for the pilot hole drilling of the raise boring rig. It achieves efficient rock crushing through the three-cone composite rotary shear mechanism. Looking roller drill bits lead the industry in hard rock penetration, bearing life and adaptability to complex formations.
Optimized tooth row layout: main teeth + auxiliary teeth are arranged in a staggered manner, and the hard rock crushing efficiency is increased by 35% (IADC 637 standard);
Fluid dynamic waterway: 6-channel high-pressure nozzle design, the rock cuttings removal speed reaches 2.5m/s, avoiding repeated grinding.
Silver-based sealing system: temperature resistance of 260℃ + anti-abrasive grease seal, bearing life is twice that of conventional drill bits;
Reinforced palm structure: palm tip tungsten carbide coating (3mm), lateral load resistance capacity up to 800kN.
Anti-gear drop-off locking: double retaining spring + locking pin design to resist strong vibration conditions;
Anti-mud packing tooth gap: self-cleaning groove design between teeth to reduce the risk of sticking in sticky formations.
Increase the flushing flow rate (≥800L/min) and add shale inhibitors (such as KCl solution).
Extremely hard rock (flint): densely distributed wedge-shaped inserts + high-friction bearings wedge-shaped teeth (impact-resistant type)
Medium-hard rock (limestone): medium-density ball teeth + reinforced palm tip ball teeth (penetration priority)
Soft rock (mudstone): long tooth tip design + large chip groove wedge-shaped teeth (self-sharpening)
Abrasive formations: full tooth surface tungsten carbide reinforcement + palm tip shield flat-top ball teeth
