Stop DTH Drill Bit Jamming | Why Wide-Gauge Bits Last Longer in Mines

2. Misconception: Using ordinary drill bits to drill through extremely hard rock formations

• Consequence: Alloy teeth cracking, fragments jamming the drill bit.
• Reason: Hard rocks such as granite require extremely high impact toughness from the drill teeth, which ordinary alloys cannot withstand.
• Solution: Choose custom drill bits such as the Xinhao XH-Q300 series, which use a special tungsten carbide alloy, increasing crack resistance by 40%.

3. Misconception: Mismatch between drill bit diameter and hole depth

• Consequence: Drill hole deviation, leading to drill bit jamming.
• Reason: Drill bits with excessively large diameters or unreasonable designs have poor stability in deep holes and are prone to friction against the hole wall.
• Principle: For deep holes (≥10 meters), it is recommended that the drill bit diameter be 5-10mm smaller than the outer diameter of the drill rod. A wide-pitch design helps maintain a clean and stable hole wall.

II. Why are Wide-Pitch Drill Bits the Superior Solution?

The wide-pitch design is specifically engineered to handle the complex geological formations found in mines, directly addressing the aforementioned pain points:

• Faster Chip Removal: Wider chip evacuation grooves (≥15mm) allow for efficient removal of rock cuttings, preventing blockages from the source.
• Increased Durability: The wider tooth spacing distributes drilling pressure, reducing wear on individual teeth. In fractured formations, the lifespan can be extended by more than 50% compared to close-pitch drill bits.
• Wider Adaptability: A high-quality wide-pitch drill bit can handle a variety of geological formations, from hard rock to fractured rock, reducing downtime due to formation changes.
  

III. Key Operating Techniques: Maximizing the Performance of Wide-Pitch Drill Bits

Correct operation can further improve performance and prevent unexpected drill bit jamming:

1.Optimized Parameters:

• Drilling Pressure: 15-20 kN
• Rotation Speed: 80-120 r/min
• Air Pressure: Ensure it is no less than 1.8-2.2 MPa (this is crucial for efficient chip removal).

2.Regular Inspection:

• Lift the drill and inspect it every 5-8 meters of drilling.
• If the alloy teeth are worn by more than 3mm, repair or replace them promptly.

3.Proactive Hole Cleaning:

• In easily blocked fractured rock formations, proactively clean the hole with high-pressure air every 3 meters of drilling.

Conclusion: Simple and Direct Selection Rules

For mining construction, remember a core principle: "For complex and fractured formations, prioritize wide-pitch drill bits; for extremely hard rock formations, be sure to match them with high-strength alloy teeth."

As a professional dth drill rigs  manufacturer, XinHao provides XinHao DTH drill rigs and customized drill bit solutions designed to help you minimize downtime. Our wide-pitch drill bit series has been applied in hundreds of mines nationwide, helping customers reduce drill bit jamming failures by an average of 80%.

Need recommendations for the most suitable drill bit for your specific working conditions? Contact us for a customized solution.