Sealed nitrogen chamber

The utility model discloses a sealed nitrogen chamber, which belongs to the field of mechanical equipment, and is characterized by comprising a cavity, a conveyor belt connected with a permanent magnet forming machine and a sintering furnace is arranged in the cavity, a nitrogen amount control device used for controlling nitrogen in the cavity is connected onto the cavity, an opening is arranged on one side of the cavity, and the nitrogen amount control device is arranged on the other side of the cavity. According to the permanent magnet tray placing device, the permanent magnets can be placed on the tray through the operation gloves, the permanent magnets can flow on the tray after being placed on the tray, the problem that the permanent magnets fall off can be avoided, the permanent magnets can be placed on the tray through the operation gloves, and the permanent magnets can be placed on the tray through the operation gloves. On the other hand, the tray can be taken out for cleaning in each circulation, so