Feeding mechanism for large-head and small-head bars

The utility model discloses a big and small head bar feeding mechanism which comprises an elevator 1, a first vibration disc, a first bridging conveying belt, a second vibration disc, a second bridging conveying belt and a rotary discharging device which are sequentially connected in a conveying mode, the output end of the first bridging conveying belt is provided with a sensor and a swingable turning-around beating plate, and the turning-around beating plate is driven by a motor. The first vibrating disc and the second vibrating disc are rotating discs driven by a motor respectively, an annular material supporting and conveying face is arranged at the edge position of the upper end face of each rotating disc, a first surrounding plate is arranged between the elevator 1 and the first bridging conveying belt, and a second surrounding plate is arranged between the first bridging conveying belt and the second bridging conveying belt. The swing end of the turning-around beating plate can swing to enter the materi