Needle missing detection device of needle bearing

The utility model relates to a needle missing detection device for a needle bearing, which comprises a fixed table, feeding conveyor belts are fixedly arranged on two sides of the fixed table, a mounting plate is fixedly arranged on the rear side of the fixed table, a top plate is fixedly arranged at the top of the mounting plate, an electric telescopic rod is fixedly arranged at the bottom of the top plate, and a rotating rod is arranged at the bottom end of the electric telescopic rod. A rotary seat is rotatably arranged on the fixed table, a camera is fixedly mounted on the mounting plate, a movable plate is slidably arranged on the front side of the fixed table, grooves are uniformly formed in the movable plate, a weighing sensor is fixedly arranged on the left side of the rotary seat, and needle bearings are conveyed to detection positions on the fixed table one by one. The weight of the needle bearing is firstly detected for the first time through the weighing sensor, then the needle bearing rotates on