Tooth collision prevention mechanism of relay driving fuel transfer device

The invention relates to the field of transportation of a nuclear fuel assembly, in particular to a tooth collision prevention mechanism of a relay driving fuel transfer device. The tooth collision prevention mechanism of the relay driving fuel transfer device structurally comprises a collision head, wherein the collision head is arranged on a rack; one end of the collision head is actively connected with the rack and further can rotate along a connection point; a spring for absorbing the collision force of connection between a relay driving gear and the rack and further enabling the collision head to return is arranged between the upper part of the collision head and the rack; and the lower end of the front part of the collision head contacts with the driving gear. The tooth collision prevention mechanism causes rigid collision during the process of contact between the gear and the rack to be changed into flexible collision, so that a transmission mechanism is protected; and in addition, the structure is simple, the reliability is high and the processing, the manufacturing and the installation are easy.