The composite sealing structure for the journal bearing better fit to different drilling condition .
Added special wedge gauge cutters resist abrasion of the tooth edge , thus effectively improve the gauging ability of the bit.
Strengthened tungsten carbide teeth on the whole palm avoid excessive abrasion by rocr mass in horizontal drilling process.
To solve the problem that the palm tip is easy to be wear in the trenchless project , we overlay weld hardfacing materials to provide better protection ,thus reducing exposure and damage of the bearing due to premature wear of the palm tip .
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