الوصف

Twist Drill Rod
 
Prestressed wire winding and welding with single strip steel or double strip steel, based on the big torque of geological drill rod. 
 
Material of rod body: geological alloy pipe
 
Material of connector: first-class alloy constructional steel

Craft: thermal refining in vacuum, which greatly improves the fatigue resistance and shearing strength. 
 
Friction welding, which improves the bending strength and the firmness of the drill rod. 

Production facility: CNC machining equipment, which guarantees the high production efficiency, steady quality and straightness. 

Design feature: overlay spiral. It guarantees big torque, quick slagging, and clear hole forming. Besides, the drill bit will hardly get stuck. 

Application: soft coal bed, and other formation similar to coal bed, which is hard to drain and deslag. 
 
Matching: 
Geological spiral drill rod, diameter not bigger than *3mm: match all kinds of hydraulic driver drill. 
When drill super soft high pressure coal seam, diameter *0mm, **3mm, **3mm, **6mm will be recommended. It will be more convenient to lay and install core barrel. This kind of drill rod guarantees high efficiency of drilling work, which stops a gap in China.