Furnace end nitrogen protection device for CuNiSn alloy horizontal continuous casting furnace

The utility model discloses a furnace end nitrogen protection device for a CuNiSn alloy horizontal continuous casting furnace, which is applied to the field of copper and copper alloy casting. The device is mainly composed of a graphite crystallizer baffle, a nitrogen guide pipe, a linear purging head and an air valve, and the graphite crystallizer baffle is installed at a pouring opening of a heat preservation furnace, fixed to the heat preservation furnace through bolts and used for fixing the graphite crystallizer; the nitrogen guide pipe is welded into a U shape by using a 2 * 2cm square pipe and is fixed on a graphite crystallizer baffle by using a bolt; the linear purging head is screwed on the nitrogen guide pipe through a thread; the linear direction of the linear purging head is parallel to the nitrogen guide pipe, a blown air seal is in a fan shape and used for guaranteeing the purging area of a CuNiSn alloy casting blank in the pull casting process, and the air valve is installed on a connecting pi