Flange positioning device

The utility model provides a flange positioning device, including back backup pad, preceding backup pad, press claw connecting piece group, be equipped with the locating pin for mounting flange on the leading flank of back backup pad, have in the preceding backup pad corresponding to the locating hole of locating pin, it will to press the claw connecting piece to organize back backup pad and preceding backup pad hinge, just press the front end of claw connecting piece group to be equipped with the pressure claw, wherein, promote back backup pad makes it be close to during preceding backup pad, the locating pin passes through the locating hole of preceding backup pad stretches out preceding backup pad with mounting flange press the claw to rotate with the supported flange under the effect of pressing claw connecting piece group, the pulling back backup pad makes it keep away from during preceding backup pad, press the claw under the effect of pressing claw connecting piece group reverse rotation with loosen th