The pants of a ball tooth drill bit is a critical component connecting the bit head and drill rod, responsible for force transmission, stability and anti-jamming. This paper briefly analyzes the functions of pants length and compares the performance differences between short, standard and long pants, providing a clear reference for engineering selection.

Abstract

The pants of a ball tooth drill bit is a critical component connecting the bit head and drill rod, responsible for force transmission, stability and anti-jamming. This paper briefly analyzes the functions of pants length and compares the performance differences between short, standard and long pants, providing a clear reference for engineering selection.

1. Introduction

Ball tooth drill bits are widely used in mining, tunneling and construction. The pants length directly affects drilling efficiency, stability and service life. Unreasonable design may cause deviation, stuck or damage. This study focuses on the role and difference of pants length to optimize application.

2. Functions of Pants Length

The pants mainly performs three core functions:

1.Transmit impact energy and torque efficiently from drill to bit.

2.Maintain drilling stability and reduce hole deviation.

3.Protect the connection and improve anti-jamming performance.

3. Difference Between Different Pants Lengths

3.1 Short Pants

●Features: short, high rigidity, large chip removal space.

●Advantages: fast drilling speed, good energy transfer.

●Disadvantages: poor stability, easy to deviate.

●Application: shallow holes, complete hard rock.

3.2 Standard Pants

●Features: moderate length, balanced performance.

●Advantages: universal, stable, suitable for most conditions.

●Application: general engineering, medium-hard rock.

3.3 Long Pants (Retrac Pants)

●Features: long guidance, strong anti-stuck ability.

●Advantages: high stability, good straightness, anti-jamming.

●Disadvantages: slightly low speed, high resistance.

●Application: deep holes, broken and loose formations.

4. Selection Principle

●Complete hard rock & shallow hole: short pants.

●General geology & normal construction: standard pants.

●Broken rock & deep hole & high precision: long pants.

5. Conclusion

Pants length determines the stability, efficiency and applicability of ball tooth drill bits. Short pants pursue speed, long pants focus on stability, and standard pants are universal. Reasonable selection according to geology and hole depth can improve efficiency and reduce failure.