Coal seam shield relief pressure drill bit

Abstract

The utility model belongs to coal mining equipment field especially relates to a coal seam shield protection pressure relief drill bit. Including drill bit body, the drill bit body includes the connecting portion that sets up in square and the power part that sets up in circular truncated cone, wherein, the corner of connecting portion sets up in cambered surface shape, connecting portion and power part all hollow and intercommunication settings, the connecting inner tube is sleeved in connecting portion, the one end of connecting inner tube is close to the connecting portion and is provided with the female head, the end of female head is provided with the water outlet pipe hole, the connecting inner tube is set up and is drawn into power part, the lateral wall of power part is provided with the through -hole, the utility model discloses the shape of the existing drill bit is improved, and the connecting portion that sets up in square cooperates the cambered surface setting of its angle, makes it can form the effect of scraping to the drilling, and then improves the stability of drilling, thereby reaches the purpose of reducing the hole collapse.

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