palm roller cone leg / tricone bit palm / rock palm bit

 Hole Opener,Assemble drill bit
The reamer bits mainly consists of more than 3 cones.cutting structure with premium tungsten carbide hardfacing o premium tungsten carbide insert of formulas and new techniques is utilized,and increases wear-resistance capacibility of reamer.

1.Main sizes: Generally bit diameters: 311mm,346mm,500mm,800mm,900mm and so on, all sizes could be customized by requirements.
2.Application: Hole opener can enlarge a small well hole to bigger diameter in construction field,bridge construction,super highway construction,railway construction etc.  This kind of bits are suitbale for different complex formation,shales,limestone,cobblestone and so on.
3.Cutting structure: the hole opener always have multi-cones.Bit cones are splited from tricone bits and welded to bulid a big diameter bit, the pilot is attched with hole opener.

Product introduction: structure characteristics:

1.Using floating bearing structure, the floating element made of new materials with high strength, high elasticity, high temperature resistance, high wear resistance characteristics and surface bear solid lubricants treatment. While lower side relative linear velocity bearing, reduce the friction surface temperature rise, thus can effectively improve the high pressure or high speed drill bearing life and reliability of bearing hole conditions.

2.It uses precision metal seal. Metal sealing ring is the bearing axial dynamic seal, Tricone bit using the basic conditions which consists of a pair of elaborate design and processing of metal. Two high elastic rubber ring are respectively located in the energy supply tusks and cone sealing area as a static seal, seal compression ensures that the two metal ring sealing surface always maintain good contact optimization.