Drill bit detecting device for oil field well drilling

The utility model discloses a drill bit detecting device for oil field well drilling. According to the technical scheme, a screw rod is connected to the interior of a shell through a bearing, one end of the screw rod is fixed through a bearing, the other end of the screw rod is connected with an ultrasonic probe, the screw rod is provided with a worm wheel matched with the screw rod, the worm wheel is connected with a motor through a worm, a probe socket is fixed to the end of the ultrasonic probe, sliding grooves are formed in the inner side face of the shell and internally provided with sliding blocks connected with the ultrasonic probe, the outer end faces of the sliding blocks are connected with the shell through springs, and the springs are arranged in the sliding grooves. The drill bit detecting device has the advantages that the well drilling detecting efficiency and accuracy are improved, the movement of the radial motor is controlled through a single-chip microcomputer, the probe and a detected cylinder wall are provided with a layer of coupling liquid with even thickness, the key purpose of effective transmission of ultrasonic echoes in low-speed sampling ultrasonic non-destructive testing imaging is well achieved, and meanwhile the rotating probe is effectively protected.