The trolley furnace is a national standard JN type periodic operation furnace with a super JN structure. It uses composite fiber insulation, ultra lightweight and high-strength microbead vacuum ball JN bricks, and produces anti drop wire inclined 20 ° wire support bricks, furnace mouth anti workpiece collision bricks, actively seals the trolley and furnace door, integrates rails, does not require basic equipment, and can be used on a horizontal ground. S is used for high chromium, high manganese steel castings, gray cast iron parts, ductile iron parts, rolling mills, steel balls, crusher hammers, wear-resistant lining plates, quenching, annealing, aging, and heat treatment of various mechanical parts.