API coal mining drill Spiral craft: prestressed wire winding and welding with single strip steel or double strip steel, based on the big torque of geological drill rod. API coal mining drill Material of rod body: geological alloy pipe API coal mining drill Material of connector: first-class alloy constructional steel API coal mining drill Craft: thermal refining in vacuum, which greatly improves the fatigue resistance and shearing strength. API coal mining drill 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. API coal mining drill 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: API coal mining drill , 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.
Linqing Ruilong Drilling Tools Co.,Ltd, established in 1993, is located in the famous ancient canal city---Linqing, Shandong, China.
Our company is professional in drill and drill bit used formine. The factory covers 16,000 square meters. There are 80 staff ,7 Professional Technical staff and more than 40 sets specialized equipment. At present, our products are serialized,new T beam with prestressed hollow drill pipe winding series: new drill pipe used for soft rock excavation,coal ... View detail