Bridge crane for flaw detection

The utility model discloses a bridge crane for flaw detection. The bridge crane comprises a girder, wherein a trolley frame is arranged on the girder; a lifting mechanism is arranged on the trolley frame; a telescopic rod and a flaw detection device are sequentially arranged below the trolley frame; the upper end of the telescopic rod is fixedly connected with the trolley frame; the lower end of the telescopic rod is fixedly connected with the flaw detection device; the lower end of the telescopic rod is fixedly connected with steel wire ropes which sequentially pass through the inside of the telescopic rod to be connected with the lifting mechanism; the telescopic rod at least comprises a first telescopic joint and a second telescopic joint which can be slidably connected; a positioning joint is arranged on the inner wall at the lower end of the first telescopic joint; the first telescopic joint is fixedly connected with the positioning joint through a positioning pin; the upper end of the second telescopic joint penetrates into the first telescopic joint; a limiting baffle plate is arranged at the end surface of the upper end of the second telescopic joint. The bridge crane disclosed by the utility model is especially suitable for a flaw detection operation of a large-scale flaw detection device. The bridge crane is slow, smooth and steady to move and is prevented from shaking.