The Difference between The Lock Rod And The Friction Rod of A Rotary Drilling Rig？

The drill pipe of a rotary drilling rig is the core component for transmitting torque and axial force. As two mainstream types, the machine lock rod and the friction rod have significant differences in structural design and applicable scenarios. Understanding the differences between the two can help construction parties choose equipment more reasonably.

1. Connection method: The mechanical lock rod is connected through the mechanical interlocking of the lock key and the keyway, which can transmit extremely large torque. The friction rods are connected by the frictional force between the inner and outer rod walls, making the structure more concise.

2. Applicable geological conditions: The mechanical lock rod is suitable for hard strata such as hard rock and pebble layers, and can withstand high-intensity impacts. Friction rods are mostly used in soft soil layers such as clay and sand, ensuring smoother drilling.

3. Lifting force performance: The mechanical locking structure of the machine lock rod makes its lifting force greater, which has a significant advantage when dealing with stuck drills. The pulling force of the friction rod is relatively weak and relies on the pressure of the hydraulic system.

4. Telescopic efficiency: When the friction rod extends or retracts, there is no need for rotation and alignment, resulting in higher operational efficiency. The machine lock rod needs to be precisely aligned and locked. The operation steps are slightly complicated and the speed is a bit slow.

5. Maintenance cost: The lock keys and keyways of the machine lock rod are prone to wear and tear, resulting in relatively high maintenance costs over long-term use. The friction rod has fewer worn parts, making daily maintenance more convenient.

6. Equipment compatibility: Large rotary drilling RIGS are mostly equipped with machine lock rods to meet the requirements of heavy-load construction. Small and medium-sized drilling RIGS are often equipped with friction rods, which take into account both flexibility and economy.

In conclusion, the selection of mechanical lock rods and friction rods should be based on geological conditions, construction intensity and equipment specifications. The mechanical lock rod is good at breaking through hard strata, while the friction rod is more efficient in soft strata. Reasonable selection can significantly improve the comprehensive benefits of rotary drilling operations.