Reaming and Self-Rotating Anchor Rod and Using Method Thereof

A reaming and self-rotating anchor rod, comprising a rod body, wherein the rod body has threads without longitudinal rib on the external surface and the rod body including an anchoring device and a connecting part in a symmetric wedge on the front and rear of a tail part respectively;

• a drill bit, wherein the drill bit is arranged at a head part of the rod body;
• the head part of the rod body connected with the drill bit via a plurality of threads, wherein the pitch of the drill bit is identical to the pitch of the threads without longitudinal rib;
• a connecting member on the connecting part to facilitate the connection to an anchor rod bolter, an end of the connecting member connected to the rod body is a cylinder with an inverted wedge-shaped cut therein, which matches the symmetric wedge at the tail part of the anchor rod body;
• wherein, the rod body, the drill bit and the connecting member are interconnected through a threaded connection into a combined structure, and
• a tightening device, wherein the tightening device comprises a tray and a nut;
• wherein when the rod body penetrates into a coal seam, the tray is fitted over the tail part of the rod body and is fixed by the nut;
• wherein an out diameter of the drill bit is greater than the diameter of the anchor rod body by 3˜8 mm,
• wherein the drill bit has an opening connected with the anchor rod body and a plurality of sharp knives that protrude and incline toward the center of the drill bit are arranged around the opening, the top of each sharp knife being between 3 mm and 5 mm from the center of the drill bit including spiral grooves configured to discharge the slack coal produced during drilling from the drill bit are arranged on the side surface of the drill bit, wherein the spiral grooves are in 5 mm˜8 mm width and 3 mm˜5 mm depth;
• wherein a plurality of baffle pawls are arranged at the clearance between the grooves on the side surface of the drill bit, and each baffle pawl comprises
• a groove cavity, the groove cavity provides a space for rotation of the high-strength baffle plate,
• a circular shaft, one side of the bottom of the groove cavity is movably connected with the high-strength baffle plate via the circular shaft,
• a high-strength baffle plate, and
• a strong spring, the strong spring being arranged between the high-strength baffle plate and the bottom of the groove cavity, the high-strength baffle plate is ejected by the strong spring and can rotate within the groove cavity via the circular shaft;
• wherein the symmetric wedge at the tail part of the rod body has a length between 30 mm and 100 mm, and the opening angle of the wedge is between 55° and 75°;
• wherein the rod body has an annular protrusion welded to the rod body between ⅓ and ⅔ length of the rod body, the diameter of the annular protrusion is greater than that of the rod body by 3 mm˜8 mm, and the thickness of the annular protrusion is between 2 mm and 3 mm.