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

Among the accessories of rotary drilling RIGS, the mechanical lock rod and the friction resistance rod are commonly used types of drill rods. Many people are not very clear about the differences between them. The following will introduce the differences between the two in detail for you from multiple aspects:

1. Structural design: The machine lock rod has a lock pin structure inside. The telescopic locking is achieved through the cooperation between the lock pin and the slot on the inner wall of the drill pipe. The friction resistance rod transmits torque by the frictional force between the drill pipes. Its structure is relatively simple and there is no complex locking device.

2. Working principle: When the machine lock rod is drilling, the lock pin extends and clamps the inner wall, providing a relatively large axial pressure, which is suitable for deep holes and hard strata. The friction resistance rod mainly transmits power through the friction between the drill pipe and the hole wall, and is more suitable for shallow hole and soft stratum operations.

3. Applicable strata: Due to its strong rigidity after locking, the machine lock rod performs well in complex strata such as hard rock and pebble layers. In soft strata such as cohesive soil and sandy soil, the friction rod can complete the drilling task relatively well by means of friction.

4. Drilling efficiency: In deep holes and hard strata, the mechanical lock rod has a relatively high drilling efficiency due to its ability to effectively transmit pressure. Friction rods have a relatively fast drilling speed in soft strata, but their efficiency will significantly decrease in hard strata.

5. Manufacturing process: The mechanical lock rod has a complex structure, high manufacturing process requirements, and relatively high costs. The friction rod has a simple process, low cost and is more convenient to maintain.

6. Appearance features: The outer wall of the machine lock rod usually has obvious lock pin holes and slots, making it look heavier overall. The outer wall of the friction rod is smooth and its structure is relatively slender, making it easier to distinguish the two from their appearance.

Understanding the differences between the lock rod and the friction rod of a rotary drilling rig can help select the appropriate drill rod in different construction scenarios, improve construction efficiency, reduce construction costs, and ensure the smooth progress of the project.