Feeding mechanism for steel arch

The utility model particularly relates to a feeding mechanism for a steel arch frame, which comprises a bottom frame, four longitudinal supports capable of sliding left and right are arranged on the bottom frame, four rotatable chains are arranged on each longitudinal support, first guide rods capable of moving back and forth are arranged on the rear sides of the longitudinal supports at the left end and the right end, and a fixing frame is fixedly arranged in the middle of the bottom frame. A second guide rod is arranged at the rear end of the fixing frame in a front-back and up-down moving mode. According to the steel arch conveying device, the steel arch can be conveyed, and meanwhile the positions of the four chains can be adjusted according to the length of the steel arch so that the steel arch conveying device can adapt to the steel arches of different length specifications; meanwhile, the adjustable sliding shaft is arranged, so that the tightness of the chain can be adjusted; the first top plate capab