6常见钻孔钻头和锤故障-以及如何在实际钻井条件下避免它们
Practical field insights from XLG 公关
In quarrying, mining, and foundation drilling, most DTH (Down-the-Hole) failures are not caused by poor product quality, but by incorrect matching, operating parameters, or maintenance practices不正确的匹配、操作参数或维护实践.在采石、采矿和基础钻井中，大多数DTH（下孔）故障不是由产品质量差引起的，而是由产品质量差引起的
Based on real field feedback and failed-component analysis, XLG summarizes the 6 most common DTH bit and hammer failure modes, along with practical ways to reduce downtime and cost.基于现场反馈和失效成分分析，XLG总结了6种最常见的潜孔钻头和锤失效模式，以及实用的解决方法
1️⃣ Support surface damage on the bit retaining ring1️2支撑面损坏
Typical causes: 典型的原因:
- Excessive wear on the chuck ring卡盘环磨损过度
- Insufficient or incorrect hammer lubrication锤头润滑不足或不正确
- Worn guide bushings 磨损的导向衬套
Field recommendation: 场推荐:
- Inspect the bit, retaining ring, and guide bushing before drilling检查钻头，固定齿圈
- Use hammer oil designed for DTH applications, not general-purpose lubricants使用专为潜孔应用设计的锤油，而不是通用润滑剂
- Replace worn internal parts proactively, not after failure主动更换磨损的内部部件，而不是在故障后更换
2️⃣ Spline breakage under high torque2️高扭矩下花键断裂
What usually goes wrong: 什么通常
- Oversized bit used with an undersized hammer超大钻头与小锤子配合使用
- Excessive torque in hard rock formations在坚硬岩层中扭矩过大
- Internal hammer components already near fatigue limit内锤部件已接近疲劳极限
Best practice:
- Larger bit diameter requires a correctly sized DTH hammer较大的钻头直径需要co
- Adjust torque according to rock hardness, not penetration speed根据岩石硬度调整扭矩，而不是穿透速度
- Avoid “forcing” the system to drill faster避免“强迫”系统钻得更快
3️⃣ Piston impact face cracking3️#活塞冲击面开裂
Often caused by: 常由：
- Worn guide bushings leading to piston misalignment导向衬套磨损
- Excessive wear on piston, retaining ring, or drive sub活塞、固定环或驱动接头磨损过度
Practical advice: 实用的建议:
- Inspect piston, drive sub, and retaining system as a complete assembly检查活塞，驱动接头和零售
- Guide bushings play a critical role in piston alignment 导衬套的作用
- Impact surface damage is usually a system-level issue冲击表面损伤通常是一个系统级问题
4️⃣ Shoulder damage due to incorrect feed force4️推入力不正确导致肩伤
A very common operational issue:一个非常常见的操作问题：
- Feed force set too high or too low for the formation进给力设置过高或过低
Operator experience: 运营商经验:
- Soft rock requires sufficient feed to keep carbide buttons engaged软岩需要足够的进给量来保持硬质合金钮扣啮合
- As drill rods increase, system weight increases — feed force should be reduced accordingly随着钻杆的增加，系统重量也会增加
- Overfeeding reduces tool life without improving efficiency
5️⃣ Piston impact surface wear or spalling
Main reasons:
- Poor lubrication
- Drill cuttings trapped between the bit and piston
How to control it:
- Ensure continuous and stable hammer oil supply
- Keep hammer connections tight and clean
- Regularly inspect the check valve assembly
6️⃣ Foot valve damage
Common triggers:
- Severe wear on piston or spline sections
- Poor alignment
- Long-term lubrication issues
Engineering solution:
- Check alignment between bit, piston, and drive base before drilling
- Use proper alignment tools to avoid bent or deviated holes
- In hard or abrasive formations, concave-face bit designs help stabilize drilling
XLG Insight
Most DTH failures are predictable — and preventable.
Correct selection, proper operating parameters, and disciplined maintenance extend not only bit life, but the entire drilling system lifecycle.
At XLG, we focus on system reliability in real drilling conditions, not just individual component wear.
📩 If you’re facing abnormal bit wear, short hammer life, or unstable performance in hard rock, feel free to connect with XLG for practical, field-oriented support.
