Reinforced rotary drilling rod square head

The utility model relates to a reinforced rotary excavating drill rod square head which comprises a drill rod body, a first spring is connected to the outer side of the drill rod body in a sleeved mode, a connecting bin is fixedly connected to the bottom of the drill rod body, a drill bit is connected to the interior of the connecting bin in a sliding mode, and a mounting mechanism is arranged on the connecting bin. And the mounting mechanism comprises a fixing block fixedly connected with the top of the drill bit, mounting bins are fixedly connected to the inner walls of the left side and the right side of the connecting bin correspondingly, pull rods are slidably connected into the mounting bins, and second springs are fixedly connected to the opposite sides of two baffles correspondingly. According to the reinforced rotary drilling rod square head, by arranging the mounting mechanism and connecting and separating a limiting rod and a fixing block, mounting and dismounting of a drill bit are completed, diff