To pull out a burner so that a nozzle of the coal burner does not interfere with a drive shaft or a bearing of the drive shaft when the coal burner is pulled out backward of a wind box.

The nozzle 7 of the burner 2 is fitted via a pair of pivot pins 8, and a tip part of a working rod 10 is pivotably supported by a fitting pin 11 in the burner 2. A rear end of the working rod 10 is turnably connected to a tip of a driven lever 15 by a link pin 13, the driven lever 15 is connected to one end side of the drive shaft 14, and a drive lever 16 is connected to the other end side of the drive shaft 14. The bearing 25 is fixed to a frame 24 of the wind box 4, and penetrates an inner wall 4a of the wind box 4. The drive shaft 14 is slidable in the axial direction of the bearing 25 when the working rod 10 and the driven lever 15 are removed.