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 rock mass in horizontal drilling process.
To solve the problem that the palm tip is easy to be wear in the trenchless project,we overly weld hardfacing materials to provide better protaction,thus reducing exposure and damage of the bearing due to premature wear of the palm tip.
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