spiral coal mining drill pipe

1. high-quality 2.high- elastic 3.rigid 4.automatically adjustable 5.stable

spiral coal mining  drill pipe

spiral coal mining  drill pipe Spiral craft: prestressed wire winding and welding with single strip steel or double strip steel, based on the big torque of geological drill rod. spiral coal mining  drill pipe Material of rod body: geological alloy pipeMaterial of connector: first-class alloy constructional steelCraft: thermal refining in vacuum, which greatly improves the fatigue resistance and shearing strength. spiral coal mining  drill pipe Rod body craft: 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. spiral coal mining  drill pipe 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 73mm: match all kinds of hydraulic driver drill. When drill super soft high pressure coal seam, diameter 90mm, 113mm, 133mm, 146mm 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.spiral coal mining  drill pipe

No.	Specifications( mm)			Craft	Connection type with drilling machine
	Dia.	Length	Thread type
1	50-42	500~1500	Taper thread	Friction welding	clamp
2	63.5-42	500~1500	Taper thread	Friction welding	clamp
3	63.5-50	500~1500	Taper thread	Friction welding	clamp
4	73-50	500~1500	Taper thread	Friction welding	clamp
5	73-63.5	500~1500	Taper thread	Friction welding	clamp
6	90-63.5	500~1500	Taper thread	Friction welding	Match active drill rod
7	98-73	500~1500	Hex. Shank	Friction welding	Match active drill rod
8	110-63.5	500~1500	Taper thread	Friction welding	Match active drill rod
9	130-63.5	500~1500	Taper thread	Friction welding	Match active drill rod
10	146-73	500~1500	Taper thread	Friction welding	Match active drill rod

  spiral coal mining  drill pipe

spiral coal mining drill pipe