Improved length-adjustable fire gun applied to smelting furnace burner

The utility model discloses an improved length-adjustable flame gun applied to a smelting furnace burner, which comprises a smelting furnace burner body, a mounting block is fixedly mounted at the outer side end of the smelting furnace burner body, an adjusting rod is arranged in the left side of the mounting block, and a mounting abutting block is arranged at the right end of the adjusting rod through a bearing; the ignition gun body is arranged in the mounting block in a penetrating mode and connected with the mounting abutting block, a fire spraying opening is integrally formed in the end, close to the central axis of the smelting furnace burner body, of the ignition gun body, an air inlet is formed in the upper side of the left wall end of the ignition gun body, and a spark plug assembly is mounted in the middle of the inner side of the ignition gun body; the connecting cover plate is installed on the outer side of the end, away from the central axis of the smelting furnace burner body, of the burning tor