The invention discloses a manufacturing method of a non-uniform crankle
box girder rotary ladder. According to the construction scheme, the manufacturing method includes the steps that 1,
flange plates and webs are lofted through a computer and then subjected to
numerical control programming, and the
flange plates and the webs are
cut with
plasma and discharged according to
programming; 2, the
flange plates and the webs are curled on a roller
bed; 3, the projection contour of the rotary ladder is drawn on a
bed mould, and the projection contour is divided into N equal parts corresponding to all levels of
stairs; 4, the altitude differences of bisectrices relative to the stepping initial side are calculated, and a
bed jig is welded to each bisectrix through profile steel according to the altitude differences; 5, bottom plates are spot-welded and assembled on the bed jigs; 6, the webs and the flange plates are spot-welded and assembled on the bottom plates; 7, top plates are spot-weldedand assembled on the flange plates and the webs, and step scribing of the levels of
stairs is carried out; 8, the levels of
stairs are spot-welded and assembled after discharging is completed throughnumerical control
programming according to an expanded view of steps of the levels of stairs; 9, omni-bearing
welding is carried out; and 10, inspection and
coating are carried out.
Assembly is carried out by simulating the actual mounting space structure size of the rotary profile steel ladder, the manufacturing precision is greatly improved, and the forming effect is good.