| 摘要 |
PURPOSE:To easily and rapidly cut the tube bundle of a heat exchanger and to execute the cutting of the tube bundle of the heat exchanger in a manner as to improve working environment by cutting the tube bundle of the heat exchanger to a staircase shape symmetrical with a center. CONSTITUTION:Only the spare torches 25 are previously ignited and arms 24 are lowered at a proper speed to put the tube bundle 3 into an easy-to-cut state by predicting the range to be cut. Gas is discharged to cutting torches 26 to cause the self ignition by the flames of the torches 25 upon completion of the descending. The arms 24 are then raised at a proper speed to cut the tube bundle 3 from below to above. A control panel 30 starts a preheating downward cutting action by a sequence circuit contained therein to simultaneously put off the flames of the torches 26 upon completion of the ascending. The torches 25 of the respective arms 24 are respectively matched with the inner position (2) with each other from the position (1) upon completion of the descending and thereafter, the upward cutting action is started by igniting the torches 26. The similar operations are thereafter repeated and the operations are progressed successively to the inner symmetrical positions (2) (3) (4) to complete the cutting operation. The tube bundle is thus cut to the staircase shape shown in figure. |
